[lhc/web/www.git] / www / plugins-dist / organiseur / lib / fullcalendar / fullcalendar.js

/*!
 * FullCalendar v3.5.1
 * Docs & License: https://fullcalendar.io/
 * (c) 2017 Adam Shaw
 */

(function(factory) {
        if (typeof define === 'function' && define.amd) {
                define([ 'jquery', 'moment' ], factory);
        }
        else if (typeof exports === 'object') { // Node/CommonJS
                module.exports = factory(require('jquery'), require('moment'));
        }
        else {
                factory(jQuery, moment);
        }
})(function($, moment) {

;;

var FC = $.fullCalendar = {
        version: "3.5.1",
        // When introducing internal API incompatibilities (where fullcalendar plugins would break),
        // the minor version of the calendar should be upped (ex: 2.7.2 -> 2.8.0)
        // and the below integer should be incremented.
        internalApiVersion: 10
};
var fcViews = FC.views = {};


$.fn.fullCalendar = function(options) {
        var args = Array.prototype.slice.call(arguments, 1); // for a possible method call
        var res = this; // what this function will return (this jQuery object by default)

        this.each(function(i, _element) { // loop each DOM element involved
                var element = $(_element);
                var calendar = element.data('fullCalendar'); // get the existing calendar object (if any)
                var singleRes; // the returned value of this single method call

                // a method call
                if (typeof options === 'string') {

                        if (options === 'getCalendar') {
                                if (!i) { // first element only
                                        res = calendar;
                                }
                        }
                        else if (options === 'destroy') { // don't warn if no calendar object
                                if (calendar) {
                                        calendar.destroy();
                                        element.removeData('fullCalendar');
                                }
                        }
                        else if (!calendar) {
                                FC.warn("Attempting to call a FullCalendar method on an element with no calendar.");
                        }
                        else if ($.isFunction(calendar[options])) {
                                singleRes = calendar[options].apply(calendar, args);

                                if (!i) {
                                        res = singleRes; // record the first method call result
                                }
                                if (options === 'destroy') { // for the destroy method, must remove Calendar object data
                                        element.removeData('fullCalendar');
                                }
                        }
                        else {
                                FC.warn("'" + options + "' is an unknown FullCalendar method.");
                        }
                }
                // a new calendar initialization
                else if (!calendar) { // don't initialize twice
                        calendar = new Calendar(element, options);
                        element.data('fullCalendar', calendar);
                        calendar.render();
                }
        });

        return res;
};


var complexOptions = [ // names of options that are objects whose properties should be combined
        'header',
        'footer',
        'buttonText',
        'buttonIcons',
        'themeButtonIcons'
];


// Merges an array of option objects into a single object
function mergeOptions(optionObjs) {
        return mergeProps(optionObjs, complexOptions);
}

;;

// exports
FC.applyAll = applyAll;
FC.debounce = debounce;
FC.isInt = isInt;
FC.htmlEscape = htmlEscape;
FC.cssToStr = cssToStr;
FC.proxy = proxy;
FC.capitaliseFirstLetter = capitaliseFirstLetter;


/* FullCalendar-specific DOM Utilities
----------------------------------------------------------------------------------------------------------------------*/


// Given the scrollbar widths of some other container, create borders/margins on rowEls in order to match the left
// and right space that was offset by the scrollbars. A 1-pixel border first, then margin beyond that.
function compensateScroll(rowEls, scrollbarWidths) {
        if (scrollbarWidths.left) {
                rowEls.css({
                        'border-left-width': 1,
                        'margin-left': scrollbarWidths.left - 1
                });
        }
        if (scrollbarWidths.right) {
                rowEls.css({
                        'border-right-width': 1,
                        'margin-right': scrollbarWidths.right - 1
                });
        }
}


// Undoes compensateScroll and restores all borders/margins
function uncompensateScroll(rowEls) {
        rowEls.css({
                'margin-left': '',
                'margin-right': '',
                'border-left-width': '',
                'border-right-width': ''
        });
}


// Make the mouse cursor express that an event is not allowed in the current area
function disableCursor() {
        $('body').addClass('fc-not-allowed');
}


// Returns the mouse cursor to its original look
function enableCursor() {
        $('body').removeClass('fc-not-allowed');
}


// Given a total available height to fill, have `els` (essentially child rows) expand to accomodate.
// By default, all elements that are shorter than the recommended height are expanded uniformly, not considering
// any other els that are already too tall. if `shouldRedistribute` is on, it considers these tall rows and 
// reduces the available height.
function distributeHeight(els, availableHeight, shouldRedistribute) {

        // *FLOORING NOTE*: we floor in certain places because zoom can give inaccurate floating-point dimensions,
        // and it is better to be shorter than taller, to avoid creating unnecessary scrollbars.

        var minOffset1 = Math.floor(availableHeight / els.length); // for non-last element
        var minOffset2 = Math.floor(availableHeight - minOffset1 * (els.length - 1)); // for last element *FLOORING NOTE*
        var flexEls = []; // elements that are allowed to expand. array of DOM nodes
        var flexOffsets = []; // amount of vertical space it takes up
        var flexHeights = []; // actual css height
        var usedHeight = 0;

        undistributeHeight(els); // give all elements their natural height

        // find elements that are below the recommended height (expandable).
        // important to query for heights in a single first pass (to avoid reflow oscillation).
        els.each(function(i, el) {
                var minOffset = i === els.length - 1 ? minOffset2 : minOffset1;
                var naturalOffset = $(el).outerHeight(true);

                if (naturalOffset < minOffset) {
                        flexEls.push(el);
                        flexOffsets.push(naturalOffset);
                        flexHeights.push($(el).height());
                }
                else {
                        // this element stretches past recommended height (non-expandable). mark the space as occupied.
                        usedHeight += naturalOffset;
                }
        });

        // readjust the recommended height to only consider the height available to non-maxed-out rows.
        if (shouldRedistribute) {
                availableHeight -= usedHeight;
                minOffset1 = Math.floor(availableHeight / flexEls.length);
                minOffset2 = Math.floor(availableHeight - minOffset1 * (flexEls.length - 1)); // *FLOORING NOTE*
        }

        // assign heights to all expandable elements
        $(flexEls).each(function(i, el) {
                var minOffset = i === flexEls.length - 1 ? minOffset2 : minOffset1;
                var naturalOffset = flexOffsets[i];
                var naturalHeight = flexHeights[i];
                var newHeight = minOffset - (naturalOffset - naturalHeight); // subtract the margin/padding

                if (naturalOffset < minOffset) { // we check this again because redistribution might have changed things
                        $(el).height(newHeight);
                }
        });
}


// Undoes distrubuteHeight, restoring all els to their natural height
function undistributeHeight(els) {
        els.height('');
}


// Given `els`, a jQuery set of <td> cells, find the cell with the largest natural width and set the widths of all the
// cells to be that width.
// PREREQUISITE: if you want a cell to take up width, it needs to have a single inner element w/ display:inline
function matchCellWidths(els) {
        var maxInnerWidth = 0;

        els.find('> *').each(function(i, innerEl) {
                var innerWidth = $(innerEl).outerWidth();
                if (innerWidth > maxInnerWidth) {
                        maxInnerWidth = innerWidth;
                }
        });

        maxInnerWidth++; // sometimes not accurate of width the text needs to stay on one line. insurance

        els.width(maxInnerWidth);

        return maxInnerWidth;
}


// Given one element that resides inside another,
// Subtracts the height of the inner element from the outer element.
function subtractInnerElHeight(outerEl, innerEl) {
        var both = outerEl.add(innerEl);
        var diff;

        // effin' IE8/9/10/11 sometimes returns 0 for dimensions. this weird hack was the only thing that worked
        both.css({
                position: 'relative', // cause a reflow, which will force fresh dimension recalculation
                left: -1 // ensure reflow in case the el was already relative. negative is less likely to cause new scroll
        });
        diff = outerEl.outerHeight() - innerEl.outerHeight(); // grab the dimensions
        both.css({ position: '', left: '' }); // undo hack

        return diff;
}


/* Element Geom Utilities
----------------------------------------------------------------------------------------------------------------------*/

FC.getOuterRect = getOuterRect;
FC.getClientRect = getClientRect;
FC.getContentRect = getContentRect;
FC.getScrollbarWidths = getScrollbarWidths;


// borrowed from https://github.com/jquery/jquery-ui/blob/1.11.0/ui/core.js#L51
function getScrollParent(el) {
        var position = el.css('position'),
                scrollParent = el.parents().filter(function() {
                        var parent = $(this);
                        return (/(auto|scroll)/).test(
                                parent.css('overflow') + parent.css('overflow-y') + parent.css('overflow-x')
                        );
                }).eq(0);

        return position === 'fixed' || !scrollParent.length ? $(el[0].ownerDocument || document) : scrollParent;
}


// Queries the outer bounding area of a jQuery element.
// Returns a rectangle with absolute coordinates: left, right (exclusive), top, bottom (exclusive).
// Origin is optional.
function getOuterRect(el, origin) {
        var offset = el.offset();
        var left = offset.left - (origin ? origin.left : 0);
        var top = offset.top - (origin ? origin.top : 0);

        return {
                left: left,
                right: left + el.outerWidth(),
                top: top,
                bottom: top + el.outerHeight()
        };
}


// Queries the area within the margin/border/scrollbars of a jQuery element. Does not go within the padding.
// Returns a rectangle with absolute coordinates: left, right (exclusive), top, bottom (exclusive).
// Origin is optional.
// WARNING: given element can't have borders
// NOTE: should use clientLeft/clientTop, but very unreliable cross-browser.
function getClientRect(el, origin) {
        var offset = el.offset();
        var scrollbarWidths = getScrollbarWidths(el);
        var left = offset.left + getCssFloat(el, 'border-left-width') + scrollbarWidths.left - (origin ? origin.left : 0);
        var top = offset.top + getCssFloat(el, 'border-top-width') + scrollbarWidths.top - (origin ? origin.top : 0);

        return {
                left: left,
                right: left + el[0].clientWidth, // clientWidth includes padding but NOT scrollbars
                top: top,
                bottom: top + el[0].clientHeight // clientHeight includes padding but NOT scrollbars
        };
}


// Queries the area within the margin/border/padding of a jQuery element. Assumed not to have scrollbars.
// Returns a rectangle with absolute coordinates: left, right (exclusive), top, bottom (exclusive).
// Origin is optional.
function getContentRect(el, origin) {
        var offset = el.offset(); // just outside of border, margin not included
        var left = offset.left + getCssFloat(el, 'border-left-width') + getCssFloat(el, 'padding-left') -
                (origin ? origin.left : 0);
        var top = offset.top + getCssFloat(el, 'border-top-width') + getCssFloat(el, 'padding-top') -
                (origin ? origin.top : 0);

        return {
                left: left,
                right: left + el.width(),
                top: top,
                bottom: top + el.height()
        };
}


// Returns the computed left/right/top/bottom scrollbar widths for the given jQuery element.
// WARNING: given element can't have borders (which will cause offsetWidth/offsetHeight to be larger).
// NOTE: should use clientLeft/clientTop, but very unreliable cross-browser.
function getScrollbarWidths(el) {
        var leftRightWidth = el[0].offsetWidth - el[0].clientWidth;
        var bottomWidth = el[0].offsetHeight - el[0].clientHeight;
        var widths;

        leftRightWidth = sanitizeScrollbarWidth(leftRightWidth);
        bottomWidth = sanitizeScrollbarWidth(bottomWidth);

        widths = { left: 0, right: 0, top: 0, bottom: bottomWidth };

        if (getIsLeftRtlScrollbars() && el.css('direction') == 'rtl') { // is the scrollbar on the left side?
                widths.left = leftRightWidth;
        }
        else {
                widths.right = leftRightWidth;
        }

        return widths;
}


// The scrollbar width computations in getScrollbarWidths are sometimes flawed when it comes to
// retina displays, rounding, and IE11. Massage them into a usable value.
function sanitizeScrollbarWidth(width) {
        width = Math.max(0, width); // no negatives
        width = Math.round(width);
        return width;
}


// Logic for determining if, when the element is right-to-left, the scrollbar appears on the left side

var _isLeftRtlScrollbars = null;

function getIsLeftRtlScrollbars() { // responsible for caching the computation
        if (_isLeftRtlScrollbars === null) {
                _isLeftRtlScrollbars = computeIsLeftRtlScrollbars();
        }
        return _isLeftRtlScrollbars;
}

function computeIsLeftRtlScrollbars() { // creates an offscreen test element, then removes it
        var el = $('<div><div/></div>')
                .css({
                        position: 'absolute',
                        top: -1000,
                        left: 0,
                        border: 0,
                        padding: 0,
                        overflow: 'scroll',
                        direction: 'rtl'
                })
                .appendTo('body');
        var innerEl = el.children();
        var res = innerEl.offset().left > el.offset().left; // is the inner div shifted to accommodate a left scrollbar?
        el.remove();
        return res;
}


// Retrieves a jQuery element's computed CSS value as a floating-point number.
// If the queried value is non-numeric (ex: IE can return "medium" for border width), will just return zero.
function getCssFloat(el, prop) {
        return parseFloat(el.css(prop)) || 0;
}


/* Mouse / Touch Utilities
----------------------------------------------------------------------------------------------------------------------*/

FC.preventDefault = preventDefault;


// Returns a boolean whether this was a left mouse click and no ctrl key (which means right click on Mac)
function isPrimaryMouseButton(ev) {
        return ev.which == 1 && !ev.ctrlKey;
}


function getEvX(ev) {
        var touches = ev.originalEvent.touches;

        // on mobile FF, pageX for touch events is present, but incorrect,
        // so, look at touch coordinates first.
        if (touches && touches.length) {
                return touches[0].pageX;
        }

        return ev.pageX;
}


function getEvY(ev) {
        var touches = ev.originalEvent.touches;

        // on mobile FF, pageX for touch events is present, but incorrect,
        // so, look at touch coordinates first.
        if (touches && touches.length) {
                return touches[0].pageY;
        }

        return ev.pageY;
}


function getEvIsTouch(ev) {
        return /^touch/.test(ev.type);
}


function preventSelection(el) {
        el.addClass('fc-unselectable')
                .on('selectstart', preventDefault);
}


function allowSelection(el) {
        el.removeClass('fc-unselectable')
                .off('selectstart', preventDefault);
}


// Stops a mouse/touch event from doing it's native browser action
function preventDefault(ev) {
        ev.preventDefault();
}


/* General Geometry Utils
----------------------------------------------------------------------------------------------------------------------*/

FC.intersectRects = intersectRects;

// Returns a new rectangle that is the intersection of the two rectangles. If they don't intersect, returns false
function intersectRects(rect1, rect2) {
        var res = {
                left: Math.max(rect1.left, rect2.left),
                right: Math.min(rect1.right, rect2.right),
                top: Math.max(rect1.top, rect2.top),
                bottom: Math.min(rect1.bottom, rect2.bottom)
        };

        if (res.left < res.right && res.top < res.bottom) {
                return res;
        }
        return false;
}


// Returns a new point that will have been moved to reside within the given rectangle
function constrainPoint(point, rect) {
        return {
                left: Math.min(Math.max(point.left, rect.left), rect.right),
                top: Math.min(Math.max(point.top, rect.top), rect.bottom)
        };
}


// Returns a point that is the center of the given rectangle
function getRectCenter(rect) {
        return {
                left: (rect.left + rect.right) / 2,
                top: (rect.top + rect.bottom) / 2
        };
}


// Subtracts point2's coordinates from point1's coordinates, returning a delta
function diffPoints(point1, point2) {
        return {
                left: point1.left - point2.left,
                top: point1.top - point2.top
        };
}


/* Object Ordering by Field
----------------------------------------------------------------------------------------------------------------------*/

FC.parseFieldSpecs = parseFieldSpecs;
FC.compareByFieldSpecs = compareByFieldSpecs;
FC.compareByFieldSpec = compareByFieldSpec;
FC.flexibleCompare = flexibleCompare;


function parseFieldSpecs(input) {
        var specs = [];
        var tokens = [];
        var i, token;

        if (typeof input === 'string') {
                tokens = input.split(/\s*,\s*/);
        }
        else if (typeof input === 'function') {
                tokens = [ input ];
        }
        else if ($.isArray(input)) {
                tokens = input;
        }

        for (i = 0; i < tokens.length; i++) {
                token = tokens[i];

                if (typeof token === 'string') {
                        specs.push(
                                token.charAt(0) == '-' ?
                                        { field: token.substring(1), order: -1 } :
                                        { field: token, order: 1 }
                        );
                }
                else if (typeof token === 'function') {
                        specs.push({ func: token });
                }
        }

        return specs;
}


function compareByFieldSpecs(obj1, obj2, fieldSpecs) {
        var i;
        var cmp;

        for (i = 0; i < fieldSpecs.length; i++) {
                cmp = compareByFieldSpec(obj1, obj2, fieldSpecs[i]);
                if (cmp) {
                        return cmp;
                }
        }

        return 0;
}


function compareByFieldSpec(obj1, obj2, fieldSpec) {
        if (fieldSpec.func) {
                return fieldSpec.func(obj1, obj2);
        }
        return flexibleCompare(obj1[fieldSpec.field], obj2[fieldSpec.field]) *
                (fieldSpec.order || 1);
}


function flexibleCompare(a, b) {
        if (!a && !b) {
                return 0;
        }
        if (b == null) {
                return -1;
        }
        if (a == null) {
                return 1;
        }
        if ($.type(a) === 'string' || $.type(b) === 'string') {
                return String(a).localeCompare(String(b));
        }
        return a - b;
}


/* Date Utilities
----------------------------------------------------------------------------------------------------------------------*/

FC.computeGreatestUnit = computeGreatestUnit;
FC.divideRangeByDuration = divideRangeByDuration;
FC.divideDurationByDuration = divideDurationByDuration;
FC.multiplyDuration = multiplyDuration;
FC.durationHasTime = durationHasTime;

var dayIDs = [ 'sun', 'mon', 'tue', 'wed', 'thu', 'fri', 'sat' ];
var unitsDesc = [ 'year', 'month', 'week', 'day', 'hour', 'minute', 'second', 'millisecond' ]; // descending


// Diffs the two moments into a Duration where full-days are recorded first, then the remaining time.
// Moments will have their timezones normalized.
function diffDayTime(a, b) {
        return moment.duration({
                days: a.clone().stripTime().diff(b.clone().stripTime(), 'days'),
                ms: a.time() - b.time() // time-of-day from day start. disregards timezone
        });
}


// Diffs the two moments via their start-of-day (regardless of timezone). Produces whole-day durations.
function diffDay(a, b) {
        return moment.duration({
                days: a.clone().stripTime().diff(b.clone().stripTime(), 'days')
        });
}


// Diffs two moments, producing a duration, made of a whole-unit-increment of the given unit. Uses rounding.
function diffByUnit(a, b, unit) {
        return moment.duration(
                Math.round(a.diff(b, unit, true)), // returnFloat=true
                unit
        );
}


// Computes the unit name of the largest whole-unit period of time.
// For example, 48 hours will be "days" whereas 49 hours will be "hours".
// Accepts start/end, a range object, or an original duration object.
function computeGreatestUnit(start, end) {
        var i, unit;
        var val;

        for (i = 0; i < unitsDesc.length; i++) {
                unit = unitsDesc[i];
                val = computeRangeAs(unit, start, end);

                if (val >= 1 && isInt(val)) {
                        break;
                }
        }

        return unit; // will be "milliseconds" if nothing else matches
}


// like computeGreatestUnit, but has special abilities to interpret the source input for clues
function computeDurationGreatestUnit(duration, durationInput) {
        var unit = computeGreatestUnit(duration);

        // prevent days:7 from being interpreted as a week
        if (unit === 'week' && typeof durationInput === 'object' && durationInput.days) {
                unit = 'day';
        }

        return unit;
}


// Computes the number of units (like "hours") in the given range.
// Range can be a {start,end} object, separate start/end args, or a Duration.
// Results are based on Moment's .as() and .diff() methods, so results can depend on internal handling
// of month-diffing logic (which tends to vary from version to version).
function computeRangeAs(unit, start, end) {

        if (end != null) { // given start, end
                return end.diff(start, unit, true);
        }
        else if (moment.isDuration(start)) { // given duration
                return start.as(unit);
        }
        else { // given { start, end } range object
                return start.end.diff(start.start, unit, true);
        }
}


// Intelligently divides a range (specified by a start/end params) by a duration
function divideRangeByDuration(start, end, dur) {
        var months;

        if (durationHasTime(dur)) {
                return (end - start) / dur;
        }
        months = dur.asMonths();
        if (Math.abs(months) >= 1 && isInt(months)) {
                return end.diff(start, 'months', true) / months;
        }
        return end.diff(start, 'days', true) / dur.asDays();
}


// Intelligently divides one duration by another
function divideDurationByDuration(dur1, dur2) {
        var months1, months2;

        if (durationHasTime(dur1) || durationHasTime(dur2)) {
                return dur1 / dur2;
        }
        months1 = dur1.asMonths();
        months2 = dur2.asMonths();
        if (
                Math.abs(months1) >= 1 && isInt(months1) &&
                Math.abs(months2) >= 1 && isInt(months2)
        ) {
                return months1 / months2;
        }
        return dur1.asDays() / dur2.asDays();
}


// Intelligently multiplies a duration by a number
function multiplyDuration(dur, n) {
        var months;

        if (durationHasTime(dur)) {
                return moment.duration(dur * n);
        }
        months = dur.asMonths();
        if (Math.abs(months) >= 1 && isInt(months)) {
                return moment.duration({ months: months * n });
        }
        return moment.duration({ days: dur.asDays() * n });
}


// Returns a boolean about whether the given duration has any time parts (hours/minutes/seconds/ms)
function durationHasTime(dur) {
        return Boolean(dur.hours() || dur.minutes() || dur.seconds() || dur.milliseconds());
}


function isNativeDate(input) {
        return  Object.prototype.toString.call(input) === '[object Date]' || input instanceof Date;
}


// Returns a boolean about whether the given input is a time string, like "06:40:00" or "06:00"
function isTimeString(str) {
        return typeof str === 'string' &&
                /^\d+\:\d+(?:\:\d+\.?(?:\d{3})?)?$/.test(str);
}


/* Logging and Debug
----------------------------------------------------------------------------------------------------------------------*/

FC.log = function() {
        var console = window.console;

        if (console && console.log) {
                return console.log.apply(console, arguments);
        }
};

FC.warn = function() {
        var console = window.console;

        if (console && console.warn) {
                return console.warn.apply(console, arguments);
        }
        else {
                return FC.log.apply(FC, arguments);
        }
};


/* General Utilities
----------------------------------------------------------------------------------------------------------------------*/

var hasOwnPropMethod = {}.hasOwnProperty;


// Merges an array of objects into a single object.
// The second argument allows for an array of property names who's object values will be merged together.
function mergeProps(propObjs, complexProps) {
        var dest = {};
        var i, name;
        var complexObjs;
        var j, val;
        var props;

        if (complexProps) {
                for (i = 0; i < complexProps.length; i++) {
                        name = complexProps[i];
                        complexObjs = [];

                        // collect the trailing object values, stopping when a non-object is discovered
                        for (j = propObjs.length - 1; j >= 0; j--) {
                                val = propObjs[j][name];

                                if (typeof val === 'object') {
                                        complexObjs.unshift(val);
                                }
                                else if (val !== undefined) {
                                        dest[name] = val; // if there were no objects, this value will be used
                                        break;
                                }
                        }

                        // if the trailing values were objects, use the merged value
                        if (complexObjs.length) {
                                dest[name] = mergeProps(complexObjs);
                        }
                }
        }

        // copy values into the destination, going from last to first
        for (i = propObjs.length - 1; i >= 0; i--) {
                props = propObjs[i];

                for (name in props) {
                        if (!(name in dest)) { // if already assigned by previous props or complex props, don't reassign
                                dest[name] = props[name];
                        }
                }
        }

        return dest;
}


function copyOwnProps(src, dest) {
        for (var name in src) {
                if (hasOwnProp(src, name)) {
                        dest[name] = src[name];
                }
        }
}


function hasOwnProp(obj, name) {
        return hasOwnPropMethod.call(obj, name);
}


function applyAll(functions, thisObj, args) {
        if ($.isFunction(functions)) {
                functions = [ functions ];
        }
        if (functions) {
                var i;
                var ret;
                for (i=0; i<functions.length; i++) {
                        ret = functions[i].apply(thisObj, args) || ret;
                }
                return ret;
        }
}


function removeMatching(array, testFunc) {
        var removeCnt = 0;
        var i = 0;

        while (i < array.length) {
                if (testFunc(array[i])) { // truthy value means *remove*
                        array.splice(i, 1);
                        removeCnt++;
                }
                else {
                        i++;
                }
        }

        return removeCnt;
}


function removeExact(array, exactVal) {
        var removeCnt = 0;
        var i = 0;

        while (i < array.length) {
                if (array[i] === exactVal) {
                        array.splice(i, 1);
                        removeCnt++;
                }
                else {
                        i++;
                }
        }

        return removeCnt;
}
FC.removeExact = removeExact;



function firstDefined() {
        for (var i=0; i<arguments.length; i++) {
                if (arguments[i] !== undefined) {
                        return arguments[i];
                }
        }
}


function htmlEscape(s) {
        return (s + '').replace(/&/g, '&amp;')
                .replace(/</g, '&lt;')
                .replace(/>/g, '&gt;')
                .replace(/'/g, '&#039;')
                .replace(/"/g, '&quot;')
                .replace(/\n/g, '<br />');
}


function stripHtmlEntities(text) {
        return text.replace(/&.*?;/g, '');
}


// Given a hash of CSS properties, returns a string of CSS.
// Uses property names as-is (no camel-case conversion). Will not make statements for null/undefined values.
function cssToStr(cssProps) {
        var statements = [];

        $.each(cssProps, function(name, val) {
                if (val != null) {
                        statements.push(name + ':' + val);
                }
        });

        return statements.join(';');
}


// Given an object hash of HTML attribute names to values,
// generates a string that can be injected between < > in HTML
function attrsToStr(attrs) {
        var parts = [];

        $.each(attrs, function(name, val) {
                if (val != null) {
                        parts.push(name + '="' + htmlEscape(val) + '"');
                }
        });

        return parts.join(' ');
}


function capitaliseFirstLetter(str) {
        return str.charAt(0).toUpperCase() + str.slice(1);
}


function compareNumbers(a, b) { // for .sort()
        return a - b;
}


function isInt(n) {
        return n % 1 === 0;
}


// Returns a method bound to the given object context.
// Just like one of the jQuery.proxy signatures, but without the undesired behavior of treating the same method with
// different contexts as identical when binding/unbinding events.
function proxy(obj, methodName) {
        var method = obj[methodName];

        return function() {
                return method.apply(obj, arguments);
        };
}


// Returns a function, that, as long as it continues to be invoked, will not
// be triggered. The function will be called after it stops being called for
// N milliseconds. If `immediate` is passed, trigger the function on the
// leading edge, instead of the trailing.
// https://github.com/jashkenas/underscore/blob/1.6.0/underscore.js#L714
function debounce(func, wait, immediate) {
        var timeout, args, context, timestamp, result;

        var later = function() {
                var last = +new Date() - timestamp;
                if (last < wait) {
                        timeout = setTimeout(later, wait - last);
                }
                else {
                        timeout = null;
                        if (!immediate) {
                                result = func.apply(context, args);
                                context = args = null;
                        }
                }
        };

        return function() {
                context = this;
                args = arguments;
                timestamp = +new Date();
                var callNow = immediate && !timeout;
                if (!timeout) {
                        timeout = setTimeout(later, wait);
                }
                if (callNow) {
                        result = func.apply(context, args);
                        context = args = null;
                }
                return result;
        };
}

;;

/*
GENERAL NOTE on moments throughout the *entire rest* of the codebase:
All moments are assumed to be ambiguously-zoned unless otherwise noted,
with the NOTABLE EXCEOPTION of start/end dates that live on *Event Objects*.
Ambiguously-TIMED moments are assumed to be ambiguously-zoned by nature.
*/

var ambigDateOfMonthRegex = /^\s*\d{4}-\d\d$/;
var ambigTimeOrZoneRegex =
        /^\s*\d{4}-(?:(\d\d-\d\d)|(W\d\d$)|(W\d\d-\d)|(\d\d\d))((T| )(\d\d(:\d\d(:\d\d(\.\d+)?)?)?)?)?$/;
var newMomentProto = moment.fn; // where we will attach our new methods
var oldMomentProto = $.extend({}, newMomentProto); // copy of original moment methods

// tell momentjs to transfer these properties upon clone
var momentProperties = moment.momentProperties;
momentProperties.push('_fullCalendar');
momentProperties.push('_ambigTime');
momentProperties.push('_ambigZone');


// Creating
// -------------------------------------------------------------------------------------------------

// Creates a new moment, similar to the vanilla moment(...) constructor, but with
// extra features (ambiguous time, enhanced formatting). When given an existing moment,
// it will function as a clone (and retain the zone of the moment). Anything else will
// result in a moment in the local zone.
FC.moment = function() {
        return makeMoment(arguments);
};

// Sames as FC.moment, but forces the resulting moment to be in the UTC timezone.
FC.moment.utc = function() {
        var mom = makeMoment(arguments, true);

        // Force it into UTC because makeMoment doesn't guarantee it
        // (if given a pre-existing moment for example)
        if (mom.hasTime()) { // don't give ambiguously-timed moments a UTC zone
                mom.utc();
        }

        return mom;
};

// Same as FC.moment, but when given an ISO8601 string, the timezone offset is preserved.
// ISO8601 strings with no timezone offset will become ambiguously zoned.
FC.moment.parseZone = function() {
        return makeMoment(arguments, true, true);
};

// Builds an enhanced moment from args. When given an existing moment, it clones. When given a
// native Date, or called with no arguments (the current time), the resulting moment will be local.
// Anything else needs to be "parsed" (a string or an array), and will be affected by:
//    parseAsUTC - if there is no zone information, should we parse the input in UTC?
//    parseZone - if there is zone information, should we force the zone of the moment?
function makeMoment(args, parseAsUTC, parseZone) {
        var input = args[0];
        var isSingleString = args.length == 1 && typeof input === 'string';
        var isAmbigTime;
        var isAmbigZone;
        var ambigMatch;
        var mom;

        if (moment.isMoment(input) || isNativeDate(input) || input === undefined) {
                mom = moment.apply(null, args);
        }
        else { // "parsing" is required
                isAmbigTime = false;
                isAmbigZone = false;

                if (isSingleString) {
                        if (ambigDateOfMonthRegex.test(input)) {
                                // accept strings like '2014-05', but convert to the first of the month
                                input += '-01';
                                args = [ input ]; // for when we pass it on to moment's constructor
                                isAmbigTime = true;
                                isAmbigZone = true;
                        }
                        else if ((ambigMatch = ambigTimeOrZoneRegex.exec(input))) {
                                isAmbigTime = !ambigMatch[5]; // no time part?
                                isAmbigZone = true;
                        }
                }
                else if ($.isArray(input)) {
                        // arrays have no timezone information, so assume ambiguous zone
                        isAmbigZone = true;
                }
                // otherwise, probably a string with a format

                if (parseAsUTC || isAmbigTime) {
                        mom = moment.utc.apply(moment, args);
                }
                else {
                        mom = moment.apply(null, args);
                }

                if (isAmbigTime) {
                        mom._ambigTime = true;
                        mom._ambigZone = true; // ambiguous time always means ambiguous zone
                }
                else if (parseZone) { // let's record the inputted zone somehow
                        if (isAmbigZone) {
                                mom._ambigZone = true;
                        }
                        else if (isSingleString) {
                                mom.utcOffset(input); // if not a valid zone, will assign UTC
                        }
                }
        }

        mom._fullCalendar = true; // flag for extended functionality

        return mom;
}


// Week Number
// -------------------------------------------------------------------------------------------------


// Returns the week number, considering the locale's custom week number calcuation
// `weeks` is an alias for `week`
newMomentProto.week = newMomentProto.weeks = function(input) {
        var weekCalc = this._locale._fullCalendar_weekCalc;

        if (input == null && typeof weekCalc === 'function') { // custom function only works for getter
                return weekCalc(this);
        }
        else if (weekCalc === 'ISO') {
                return oldMomentProto.isoWeek.apply(this, arguments); // ISO getter/setter
        }

        return oldMomentProto.week.apply(this, arguments); // local getter/setter
};


// Time-of-day
// -------------------------------------------------------------------------------------------------

// GETTER
// Returns a Duration with the hours/minutes/seconds/ms values of the moment.
// If the moment has an ambiguous time, a duration of 00:00 will be returned.
//
// SETTER
// You can supply a Duration, a Moment, or a Duration-like argument.
// When setting the time, and the moment has an ambiguous time, it then becomes unambiguous.
newMomentProto.time = function(time) {

        // Fallback to the original method (if there is one) if this moment wasn't created via FullCalendar.
        // `time` is a generic enough method name where this precaution is necessary to avoid collisions w/ other plugins.
        if (!this._fullCalendar) {
                return oldMomentProto.time.apply(this, arguments);
        }

        if (time == null) { // getter
                return moment.duration({
                        hours: this.hours(),
                        minutes: this.minutes(),
                        seconds: this.seconds(),
                        milliseconds: this.milliseconds()
                });
        }
        else { // setter

                this._ambigTime = false; // mark that the moment now has a time

                if (!moment.isDuration(time) && !moment.isMoment(time)) {
                        time = moment.duration(time);
                }

                // The day value should cause overflow (so 24 hours becomes 00:00:00 of next day).
                // Only for Duration times, not Moment times.
                var dayHours = 0;
                if (moment.isDuration(time)) {
                        dayHours = Math.floor(time.asDays()) * 24;
                }

                // We need to set the individual fields.
                // Can't use startOf('day') then add duration. In case of DST at start of day.
                return this.hours(dayHours + time.hours())
                        .minutes(time.minutes())
                        .seconds(time.seconds())
                        .milliseconds(time.milliseconds());
        }
};

// Converts the moment to UTC, stripping out its time-of-day and timezone offset,
// but preserving its YMD. A moment with a stripped time will display no time
// nor timezone offset when .format() is called.
newMomentProto.stripTime = function() {

        if (!this._ambigTime) {

                this.utc(true); // keepLocalTime=true (for keeping *date* value)

                // set time to zero
                this.set({
                        hours: 0,
                        minutes: 0,
                        seconds: 0,
                        ms: 0
                });

                // Mark the time as ambiguous. This needs to happen after the .utc() call, which might call .utcOffset(),
                // which clears all ambig flags.
                this._ambigTime = true;
                this._ambigZone = true; // if ambiguous time, also ambiguous timezone offset
        }

        return this; // for chaining
};

// Returns if the moment has a non-ambiguous time (boolean)
newMomentProto.hasTime = function() {
        return !this._ambigTime;
};


// Timezone
// -------------------------------------------------------------------------------------------------

// Converts the moment to UTC, stripping out its timezone offset, but preserving its
// YMD and time-of-day. A moment with a stripped timezone offset will display no
// timezone offset when .format() is called.
newMomentProto.stripZone = function() {
        var wasAmbigTime;

        if (!this._ambigZone) {

                wasAmbigTime = this._ambigTime;

                this.utc(true); // keepLocalTime=true (for keeping date and time values)

                // the above call to .utc()/.utcOffset() unfortunately might clear the ambig flags, so restore
                this._ambigTime = wasAmbigTime || false;

                // Mark the zone as ambiguous. This needs to happen after the .utc() call, which might call .utcOffset(),
                // which clears the ambig flags.
                this._ambigZone = true;
        }

        return this; // for chaining
};

// Returns of the moment has a non-ambiguous timezone offset (boolean)
newMomentProto.hasZone = function() {
        return !this._ambigZone;
};


// implicitly marks a zone
newMomentProto.local = function(keepLocalTime) {

        // for when converting from ambiguously-zoned to local,
        // keep the time values when converting from UTC -> local
        oldMomentProto.local.call(this, this._ambigZone || keepLocalTime);

        // ensure non-ambiguous
        // this probably already happened via local() -> utcOffset(), but don't rely on Moment's internals
        this._ambigTime = false;
        this._ambigZone = false;

        return this; // for chaining
};


// implicitly marks a zone
newMomentProto.utc = function(keepLocalTime) {

        oldMomentProto.utc.call(this, keepLocalTime);

        // ensure non-ambiguous
        // this probably already happened via utc() -> utcOffset(), but don't rely on Moment's internals
        this._ambigTime = false;
        this._ambigZone = false;

        return this;
};


// implicitly marks a zone (will probably get called upon .utc() and .local())
newMomentProto.utcOffset = function(tzo) {

        if (tzo != null) { // setter
                // these assignments needs to happen before the original zone method is called.
                // I forget why, something to do with a browser crash.
                this._ambigTime = false;
                this._ambigZone = false;
        }

        return oldMomentProto.utcOffset.apply(this, arguments);
};


// Formatting
// -------------------------------------------------------------------------------------------------

newMomentProto.format = function() {

        if (this._fullCalendar && arguments[0]) { // an enhanced moment? and a format string provided?
                return formatDate(this, arguments[0]); // our extended formatting
        }
        if (this._ambigTime) {
                return oldMomentFormat(englishMoment(this), 'YYYY-MM-DD');
        }
        if (this._ambigZone) {
                return oldMomentFormat(englishMoment(this), 'YYYY-MM-DD[T]HH:mm:ss');
        }
        if (this._fullCalendar) { // enhanced non-ambig moment?
                // moment.format() doesn't ensure english, but we want to.
                return oldMomentFormat(englishMoment(this));
        }

        return oldMomentProto.format.apply(this, arguments);
};

newMomentProto.toISOString = function() {

        if (this._ambigTime) {
                return oldMomentFormat(englishMoment(this), 'YYYY-MM-DD');
        }
        if (this._ambigZone) {
                return oldMomentFormat(englishMoment(this), 'YYYY-MM-DD[T]HH:mm:ss');
        }
        if (this._fullCalendar) { // enhanced non-ambig moment?
                // depending on browser, moment might not output english. ensure english.
                // https://github.com/moment/moment/blob/2.18.1/src/lib/moment/format.js#L22
                return oldMomentProto.toISOString.apply(englishMoment(this), arguments);
        }

        return oldMomentProto.toISOString.apply(this, arguments);
};

function englishMoment(mom) {
        if (mom.locale() !== 'en') {
                return mom.clone().locale('en');
        }
        return mom;
}

;;
(function() {

// exports
FC.formatDate = formatDate;
FC.formatRange = formatRange;
FC.oldMomentFormat = oldMomentFormat;
FC.queryMostGranularFormatUnit = queryMostGranularFormatUnit;


// Config
// ---------------------------------------------------------------------------------------------------------------------

/*
Inserted between chunks in the fake ("intermediate") formatting string.
Important that it passes as whitespace (\s) because moment often identifies non-standalone months
via a regexp with an \s.
*/
var PART_SEPARATOR = '\u000b'; // vertical tab

/*
Inserted as the first character of a literal-text chunk to indicate that the literal text is not actually literal text,
but rather, a "special" token that has custom rendering (see specialTokens map).
*/
var SPECIAL_TOKEN_MARKER = '\u001f'; // information separator 1

/*
Inserted at the beginning and end of a span of text that must have non-zero numeric characters.
Handling of these markers is done in a post-processing step at the very end of text rendering.
*/
var MAYBE_MARKER = '\u001e'; // information separator 2
var MAYBE_REGEXP = new RegExp(MAYBE_MARKER + '([^' + MAYBE_MARKER + ']*)' + MAYBE_MARKER, 'g'); // must be global

/*
Addition formatting tokens we want recognized
*/
var specialTokens = {
        t: function(date) { // "a" or "p"
                return oldMomentFormat(date, 'a').charAt(0);
        },
        T: function(date) { // "A" or "P"
                return oldMomentFormat(date, 'A').charAt(0);
        }
};

/*
The first characters of formatting tokens for units that are 1 day or larger.
`value` is for ranking relative size (lower means bigger).
`unit` is a normalized unit, used for comparing moments.
*/
var largeTokenMap = {
        Y: { value: 1, unit: 'year' },
        M: { value: 2, unit: 'month' },
        W: { value: 3, unit: 'week' }, // ISO week
        w: { value: 3, unit: 'week' }, // local week
        D: { value: 4, unit: 'day' }, // day of month
        d: { value: 4, unit: 'day' } // day of week
};


// Single Date Formatting
// ---------------------------------------------------------------------------------------------------------------------

/*
Formats `date` with a Moment formatting string, but allow our non-zero areas and special token
*/
function formatDate(date, formatStr) {
        return renderFakeFormatString(
                getParsedFormatString(formatStr).fakeFormatString,
                date
        );
}

/*
Call this if you want Moment's original format method to be used
*/
function oldMomentFormat(mom, formatStr) {
        return oldMomentProto.format.call(mom, formatStr); // oldMomentProto defined in moment-ext.js
}


// Date Range Formatting
// -------------------------------------------------------------------------------------------------
// TODO: make it work with timezone offset

/*
Using a formatting string meant for a single date, generate a range string, like
"Sep 2 - 9 2013", that intelligently inserts a separator where the dates differ.
If the dates are the same as far as the format string is concerned, just return a single
rendering of one date, without any separator.
*/
function formatRange(date1, date2, formatStr, separator, isRTL) {
        var localeData;

        date1 = FC.moment.parseZone(date1);
        date2 = FC.moment.parseZone(date2);

        localeData = date1.localeData();

        // Expand localized format strings, like "LL" -> "MMMM D YYYY".
        // BTW, this is not important for `formatDate` because it is impossible to put custom tokens
        // or non-zero areas in Moment's localized format strings.
        formatStr = localeData.longDateFormat(formatStr) || formatStr;

        return renderParsedFormat(
                getParsedFormatString(formatStr),
                date1,
                date2,
                separator || ' - ',
                isRTL
        );
}

/*
Renders a range with an already-parsed format string.
*/
function renderParsedFormat(parsedFormat, date1, date2, separator, isRTL) {
        var sameUnits = parsedFormat.sameUnits;
        var unzonedDate1 = date1.clone().stripZone(); // for same-unit comparisons
        var unzonedDate2 = date2.clone().stripZone(); // "

        var renderedParts1 = renderFakeFormatStringParts(parsedFormat.fakeFormatString, date1);
        var renderedParts2 = renderFakeFormatStringParts(parsedFormat.fakeFormatString, date2);

        var leftI;
        var leftStr = '';
        var rightI;
        var rightStr = '';
        var middleI;
        var middleStr1 = '';
        var middleStr2 = '';
        var middleStr = '';

        // Start at the leftmost side of the formatting string and continue until you hit a token
        // that is not the same between dates.
        for (
                leftI = 0;
                leftI < sameUnits.length && (!sameUnits[leftI] || unzonedDate1.isSame(unzonedDate2, sameUnits[leftI]));
                leftI++
        ) {
                leftStr += renderedParts1[leftI];
        }

        // Similarly, start at the rightmost side of the formatting string and move left
        for (
                rightI = sameUnits.length - 1;
                rightI > leftI && (!sameUnits[rightI] || unzonedDate1.isSame(unzonedDate2, sameUnits[rightI]));
                rightI--
        ) {
                // If current chunk is on the boundary of unique date-content, and is a special-case
                // date-formatting postfix character, then don't consume it. Consider it unique date-content.
                // TODO: make configurable
                if (rightI - 1 === leftI && renderedParts1[rightI] === '.') {
                        break;
                }

                rightStr = renderedParts1[rightI] + rightStr;
        }

        // The area in the middle is different for both of the dates.
        // Collect them distinctly so we can jam them together later.
        for (middleI = leftI; middleI <= rightI; middleI++) {
                middleStr1 += renderedParts1[middleI];
                middleStr2 += renderedParts2[middleI];
        }

        if (middleStr1 || middleStr2) {
                if (isRTL) {
                        middleStr = middleStr2 + separator + middleStr1;
                }
                else {
                        middleStr = middleStr1 + separator + middleStr2;
                }
        }

        return processMaybeMarkers(
                leftStr + middleStr + rightStr
        );
}


// Format String Parsing
// ---------------------------------------------------------------------------------------------------------------------

var parsedFormatStrCache = {};

/*
Returns a parsed format string, leveraging a cache.
*/
function getParsedFormatString(formatStr) {
        return parsedFormatStrCache[formatStr] ||
                (parsedFormatStrCache[formatStr] = parseFormatString(formatStr));
}

/*
Parses a format string into the following:
- fakeFormatString: a momentJS formatting string, littered with special control characters that get post-processed.
- sameUnits: for every part in fakeFormatString, if the part is a token, the value will be a unit string (like "day"),
  that indicates how similar a range's start & end must be in order to share the same formatted text.
  If not a token, then the value is null.
  Always a flat array (not nested liked "chunks").
*/
function parseFormatString(formatStr) {
        var chunks = chunkFormatString(formatStr);
        
        return {
                fakeFormatString: buildFakeFormatString(chunks),
                sameUnits: buildSameUnits(chunks)
        };
}

/*
Break the formatting string into an array of chunks.
A 'maybe' chunk will have nested chunks.
*/
function chunkFormatString(formatStr) {
        var chunks = [];
        var match;

        // TODO: more descrimination
        // \4 is a backreference to the first character of a multi-character set.
        var chunker = /\[([^\]]*)\]|\(([^\)]*)\)|(LTS|LT|(\w)\4*o?)|([^\w\[\(]+)/g;

        while ((match = chunker.exec(formatStr))) {
                if (match[1]) { // a literal string inside [ ... ]
                        chunks.push.apply(chunks, // append
                                splitStringLiteral(match[1])
                        );
                }
                else if (match[2]) { // non-zero formatting inside ( ... )
                        chunks.push({ maybe: chunkFormatString(match[2]) });
                }
                else if (match[3]) { // a formatting token
                        chunks.push({ token: match[3] });
                }
                else if (match[5]) { // an unenclosed literal string
                        chunks.push.apply(chunks, // append
                                splitStringLiteral(match[5])
                        );
                }
        }

        return chunks;
}

/*
Potentially splits a literal-text string into multiple parts. For special cases.
*/
function splitStringLiteral(s) {
        if (s === '. ') {
                return [ '.', ' ' ]; // for locales with periods bound to the end of each year/month/date
        }
        else {
                return [ s ];
        }
}

/*
Given chunks parsed from a real format string, generate a fake (aka "intermediate") format string with special control
characters that will eventually be given to moment for formatting, and then post-processed.
*/
function buildFakeFormatString(chunks) {
        var parts = [];
        var i, chunk;

        for (i = 0; i < chunks.length; i++) {
                chunk = chunks[i];

                if (typeof chunk === 'string') {
                        parts.push('[' + chunk + ']');
                }
                else if (chunk.token) {
                        if (chunk.token in specialTokens) {
                                parts.push(
                                        SPECIAL_TOKEN_MARKER + // useful during post-processing
                                        '[' + chunk.token + ']' // preserve as literal text
                                );
                        }
                        else {
                                parts.push(chunk.token); // unprotected text implies a format string
                        }
                }
                else if (chunk.maybe) {
                        parts.push(
                                MAYBE_MARKER + // useful during post-processing
                                buildFakeFormatString(chunk.maybe) +
                                MAYBE_MARKER
                        );
                }
        }

        return parts.join(PART_SEPARATOR);
}

/*
Given parsed chunks from a real formatting string, generates an array of unit strings (like "day") that indicate
in which regard two dates must be similar in order to share range formatting text.
The `chunks` can be nested (because of "maybe" chunks), however, the returned array will be flat.
*/
function buildSameUnits(chunks) {
        var units = [];
        var i, chunk;
        var tokenInfo;

        for (i = 0; i < chunks.length; i++) {
                chunk = chunks[i];

                if (chunk.token) {
                        tokenInfo = largeTokenMap[chunk.token.charAt(0)];
                        units.push(tokenInfo ? tokenInfo.unit : 'second'); // default to a very strict same-second
                }
                else if (chunk.maybe) {
                        units.push.apply(units, // append
                                buildSameUnits(chunk.maybe)
                        );
                }
                else {
                        units.push(null);
                }
        }

        return units;
}


// Rendering to text
// ---------------------------------------------------------------------------------------------------------------------

/*
Formats a date with a fake format string, post-processes the control characters, then returns.
*/
function renderFakeFormatString(fakeFormatString, date) {
        return processMaybeMarkers(
                renderFakeFormatStringParts(fakeFormatString, date).join('')
        );
}

/*
Formats a date into parts that will have been post-processed, EXCEPT for the "maybe" markers.
*/
function renderFakeFormatStringParts(fakeFormatString, date) {
        var parts = [];
        var fakeRender = oldMomentFormat(date, fakeFormatString);
        var fakeParts = fakeRender.split(PART_SEPARATOR);
        var i, fakePart;

        for (i = 0; i < fakeParts.length; i++) {
                fakePart = fakeParts[i];

                if (fakePart.charAt(0) === SPECIAL_TOKEN_MARKER) {
                        parts.push(
                                // the literal string IS the token's name.
                                // call special token's registered function.
                                specialTokens[fakePart.substring(1)](date)
                        );
                }
                else {
                        parts.push(fakePart);
                }
        }

        return parts;
}

/*
Accepts an almost-finally-formatted string and processes the "maybe" control characters, returning a new string.
*/
function processMaybeMarkers(s) {
        return s.replace(MAYBE_REGEXP, function(m0, m1) { // regex assumed to have 'g' flag
                if (m1.match(/[1-9]/)) { // any non-zero numeric characters?
                        return m1;
                }
                else {
                        return '';
                }
        });
}


// Misc Utils
// -------------------------------------------------------------------------------------------------

/*
Returns a unit string, either 'year', 'month', 'day', or null for the most granular formatting token in the string.
*/
function queryMostGranularFormatUnit(formatStr) {
        var chunks = chunkFormatString(formatStr);
        var i, chunk;
        var candidate;
        var best;

        for (i = 0; i < chunks.length; i++) {
                chunk = chunks[i];

                if (chunk.token) {
                        candidate = largeTokenMap[chunk.token.charAt(0)];
                        if (candidate) {
                                if (!best || candidate.value > best.value) {
                                        best = candidate;
                                }
                        }
                }
        }

        if (best) {
                return best.unit;
        }

        return null;
};

})();

// quick local references
var formatDate = FC.formatDate;
var formatRange = FC.formatRange;
var oldMomentFormat = FC.oldMomentFormat;

;;

FC.Class = Class; // export

// Class that all other classes will inherit from
function Class() { }


// Called on a class to create a subclass.
// Last argument contains instance methods. Any argument before the last are considered mixins.
Class.extend = function() {
        var members = {};
        var i;

        for (i = 0; i < arguments.length; i++) {
                copyOwnProps(arguments[i], members);
        }

        return extendClass(this, members);
};


// Adds new member variables/methods to the class's prototype.
// Can be called with another class, or a plain object hash containing new members.
Class.mixin = function(members) {
        copyOwnProps(members, this.prototype);
};


function extendClass(superClass, members) {
        var subClass;

        // ensure a constructor for the subclass, forwarding all arguments to the super-constructor if it doesn't exist
        if (hasOwnProp(members, 'constructor')) {
                subClass = members.constructor;
        }
        if (typeof subClass !== 'function') {
                subClass = members.constructor = function() {
                        superClass.apply(this, arguments);
                };
        }

        // build the base prototype for the subclass, which is an new object chained to the superclass's prototype
        subClass.prototype = Object.create(superClass.prototype);

        // copy each member variable/method onto the the subclass's prototype
        copyOwnProps(members, subClass.prototype);

        // copy over all class variables/methods to the subclass, such as `extend` and `mixin`
        copyOwnProps(superClass, subClass);

        return subClass;
}

;;

var EmitterMixin = FC.EmitterMixin = {

        // jQuery-ification via $(this) allows a non-DOM object to have
        // the same event handling capabilities (including namespaces).


        on: function(types, handler) {
                $(this).on(types, this._prepareIntercept(handler));
                return this; // for chaining
        },


        one: function(types, handler) {
                $(this).one(types, this._prepareIntercept(handler));
                return this; // for chaining
        },


        _prepareIntercept: function(handler) {
                // handlers are always called with an "event" object as their first param.
                // sneak the `this` context and arguments into the extra parameter object
                // and forward them on to the original handler.
                var intercept = function(ev, extra) {
                        return handler.apply(
                                extra.context || this,
                                extra.args || []
                        );
                };

                // mimick jQuery's internal "proxy" system (risky, I know)
                // causing all functions with the same .guid to appear to be the same.
                // https://github.com/jquery/jquery/blob/2.2.4/src/core.js#L448
                // this is needed for calling .off with the original non-intercept handler.
                if (!handler.guid) {
                        handler.guid = $.guid++;
                }
                intercept.guid = handler.guid;

                return intercept;
        },


        off: function(types, handler) {
                $(this).off(types, handler);

                return this; // for chaining
        },


        trigger: function(types) {
                var args = Array.prototype.slice.call(arguments, 1); // arguments after the first

                // pass in "extra" info to the intercept
                $(this).triggerHandler(types, { args: args });

                return this; // for chaining
        },


        triggerWith: function(types, context, args) {

                // `triggerHandler` is less reliant on the DOM compared to `trigger`.
                // pass in "extra" info to the intercept.
                $(this).triggerHandler(types, { context: context, args: args });

                return this; // for chaining
        },


        hasHandlers: function(type) {
                var hash = $._data(this, 'events'); // http://blog.jquery.com/2012/08/09/jquery-1-8-released/

                return hash && hash[type] && hash[type].length > 0;
        }

};

;;

/*
Utility methods for easily listening to events on another object,
and more importantly, easily unlistening from them.
*/
var ListenerMixin = FC.ListenerMixin = (function() {
        var guid = 0;
        var ListenerMixin = {

                listenerId: null,

                /*
                Given an `other` object that has on/off methods, bind the given `callback` to an event by the given name.
                The `callback` will be called with the `this` context of the object that .listenTo is being called on.
                Can be called:
                        .listenTo(other, eventName, callback)
                OR
                        .listenTo(other, {
                                eventName1: callback1,
                                eventName2: callback2
                        })
                */
                listenTo: function(other, arg, callback) {
                        if (typeof arg === 'object') { // given dictionary of callbacks
                                for (var eventName in arg) {
                                        if (arg.hasOwnProperty(eventName)) {
                                                this.listenTo(other, eventName, arg[eventName]);
                                        }
                                }
                        }
                        else if (typeof arg === 'string') {
                                other.on(
                                        arg + '.' + this.getListenerNamespace(), // use event namespacing to identify this object
                                        $.proxy(callback, this) // always use `this` context
                                                // the usually-undesired jQuery guid behavior doesn't matter,
                                                // because we always unbind via namespace
                                );
                        }
                },

                /*
                Causes the current object to stop listening to events on the `other` object.
                `eventName` is optional. If omitted, will stop listening to ALL events on `other`.
                */
                stopListeningTo: function(other, eventName) {
                        other.off((eventName || '') + '.' + this.getListenerNamespace());
                },

                /*
                Returns a string, unique to this object, to be used for event namespacing
                */
                getListenerNamespace: function() {
                        if (this.listenerId == null) {
                                this.listenerId = guid++;
                        }
                        return '_listener' + this.listenerId;
                }

        };
        return ListenerMixin;
})();
;;

var ParsableModelMixin = {

        standardPropMap: {}, // will be cloned by allowRawProps


        /*
        Returns true/false for success
        */
        applyRawProps: function(rawProps) {
                var standardPropMap = this.standardPropMap;
                var manualProps = {};
                var otherProps = {};
                var propName;

                for (propName in rawProps) {
                        if (standardPropMap[propName] === true) { // copy automatically
                                this[propName] = rawProps[propName];
                        }
                        else if (standardPropMap[propName] === false) {
                                manualProps[propName] = rawProps[propName];
                        }
                        else {
                                otherProps[propName] = rawProps[propName];
                        }
                }

                this.applyOtherRawProps(otherProps);

                return this.applyManualRawProps(manualProps);
        },


        /*
        If subclasses override, they must call this supermethod and return the boolean response.
        */
        applyManualRawProps: function(rawProps) {
                return true;
        },


        applyOtherRawProps: function(rawProps) {
                // subclasses can implement
        }

};


/*
TODO: devise a better system
*/
var ParsableModelMixin_allowRawProps = function(propDefs) {
        var proto = this.prototype;

        proto.standardPropMap = Object.create(proto.standardPropMap);

        copyOwnProps(propDefs, proto.standardPropMap);
};


/*
TODO: devise a better system
*/
var ParsableModelMixin_copyVerbatimStandardProps = function(src, dest) {
        var map = this.prototype.standardPropMap;
        var propName;

        for (propName in map) {
                if (
                        src[propName] != null && // in the src object?
                        map[propName] === true // false means "copy verbatim"
                ) {
                        dest[propName] = src[propName];
                }
        }
};

;;

var Model = Class.extend(EmitterMixin, ListenerMixin, {

        _props: null,
        _watchers: null,
        _globalWatchArgs: null,

        constructor: function() {
                this._watchers = {};
                this._props = {};
                this.applyGlobalWatchers();
        },

        applyGlobalWatchers: function() {
                var argSets = this._globalWatchArgs || [];
                var i;

                for (i = 0; i < argSets.length; i++) {
                        this.watch.apply(this, argSets[i]);
                }
        },

        has: function(name) {
                return name in this._props;
        },

        get: function(name) {
                if (name === undefined) {
                        return this._props;
                }

                return this._props[name];
        },

        set: function(name, val) {
                var newProps;

                if (typeof name === 'string') {
                        newProps = {};
                        newProps[name] = val === undefined ? null : val;
                }
                else {
                        newProps = name;
                }

                this.setProps(newProps);
        },

        reset: function(newProps) {
                var oldProps = this._props;
                var changeset = {}; // will have undefined's to signal unsets
                var name;

                for (name in oldProps) {
                        changeset[name] = undefined;
                }

                for (name in newProps) {
                        changeset[name] = newProps[name];
                }

                this.setProps(changeset);
        },

        unset: function(name) { // accepts a string or array of strings
                var newProps = {};
                var names;
                var i;

                if (typeof name === 'string') {
                        names = [ name ];
                }
                else {
                        names = name;
                }

                for (i = 0; i < names.length; i++) {
                        newProps[names[i]] = undefined;
                }

                this.setProps(newProps);
        },

        setProps: function(newProps) {
                var changedProps = {};
                var changedCnt = 0;
                var name, val;

                for (name in newProps) {
                        val = newProps[name];

                        // a change in value?
                        // if an object, don't check equality, because might have been mutated internally.
                        // TODO: eventually enforce immutability.
                        if (
                                typeof val === 'object' ||
                                val !== this._props[name]
                        ) {
                                changedProps[name] = val;
                                changedCnt++;
                        }
                }

                if (changedCnt) {

                        this.trigger('before:batchChange', changedProps);

                        for (name in changedProps) {
                                val = changedProps[name];

                                this.trigger('before:change', name, val);
                                this.trigger('before:change:' + name, val);
                        }

                        for (name in changedProps) {
                                val = changedProps[name];

                                if (val === undefined) {
                                        delete this._props[name];
                                }
                                else {
                                        this._props[name] = val;
                                }

                                this.trigger('change:' + name, val);
                                this.trigger('change', name, val);
                        }

                        this.trigger('batchChange', changedProps);
                }
        },

        watch: function(name, depList, startFunc, stopFunc) {
                var _this = this;

                this.unwatch(name);

                this._watchers[name] = this._watchDeps(depList, function(deps) {
                        var res = startFunc.call(_this, deps);

                        if (res && res.then) {
                                _this.unset(name); // put in an unset state while resolving
                                res.then(function(val) {
                                        _this.set(name, val);
                                });
                        }
                        else {
                                _this.set(name, res);
                        }
                }, function() {
                        _this.unset(name);

                        if (stopFunc) {
                                stopFunc.call(_this);
                        }
                });
        },

        unwatch: function(name) {
                var watcher = this._watchers[name];

                if (watcher) {
                        delete this._watchers[name];
                        watcher.teardown();
                }
        },

        _watchDeps: function(depList, startFunc, stopFunc) {
                var _this = this;
                var queuedChangeCnt = 0;
                var depCnt = depList.length;
                var satisfyCnt = 0;
                var values = {}; // what's passed as the `deps` arguments
                var bindTuples = []; // array of [ eventName, handlerFunc ] arrays
                var isCallingStop = false;

                function onBeforeDepChange(depName, val, isOptional) {
                        queuedChangeCnt++;
                        if (queuedChangeCnt === 1) { // first change to cause a "stop" ?
                                if (satisfyCnt === depCnt) { // all deps previously satisfied?
                                        isCallingStop = true;
                                        stopFunc();
                                        isCallingStop = false;
                                }
                        }
                }

                function onDepChange(depName, val, isOptional) {

                        if (val === undefined) { // unsetting a value?

                                // required dependency that was previously set?
                                if (!isOptional && values[depName] !== undefined) {
                                        satisfyCnt--;
                                }

                                delete values[depName];
                        }
                        else { // setting a value?

                                // required dependency that was previously unset?
                                if (!isOptional && values[depName] === undefined) {
                                        satisfyCnt++;
                                }

                                values[depName] = val;
                        }

                        queuedChangeCnt--;
                        if (!queuedChangeCnt) { // last change to cause a "start"?

                                // now finally satisfied or satisfied all along?
                                if (satisfyCnt === depCnt) {

                                        // if the stopFunc initiated another value change, ignore it.
                                        // it will be processed by another change event anyway.
                                        if (!isCallingStop) {
                                                startFunc(values);
                                        }
                                }
                        }
                }

                // intercept for .on() that remembers handlers
                function bind(eventName, handler) {
                        _this.on(eventName, handler);
                        bindTuples.push([ eventName, handler ]);
                }

                // listen to dependency changes
                depList.forEach(function(depName) {
                        var isOptional = false;

                        if (depName.charAt(0) === '?') { // TODO: more DRY
                                depName = depName.substring(1);
                                isOptional = true;
                        }

                        bind('before:change:' + depName, function(val) {
                                onBeforeDepChange(depName, val, isOptional);
                        });

                        bind('change:' + depName, function(val) {
                                onDepChange(depName, val, isOptional);
                        });
                });

                // process current dependency values
                depList.forEach(function(depName) {
                        var isOptional = false;

                        if (depName.charAt(0) === '?') { // TODO: more DRY
                                depName = depName.substring(1);
                                isOptional = true;
                        }

                        if (_this.has(depName)) {
                                values[depName] = _this.get(depName);
                                satisfyCnt++;
                        }
                        else if (isOptional) {
                                satisfyCnt++;
                        }
                });

                // initially satisfied
                if (satisfyCnt === depCnt) {
                        startFunc(values);
                }

                return {
                        teardown: function() {
                                // remove all handlers
                                for (var i = 0; i < bindTuples.length; i++) {
                                        _this.off(bindTuples[i][0], bindTuples[i][1]);
                                }
                                bindTuples = null;

                                // was satisfied, so call stopFunc
                                if (satisfyCnt === depCnt) {
                                        stopFunc();
                                }
                        },
                        flash: function() {
                                if (satisfyCnt === depCnt) {
                                        stopFunc();
                                        startFunc(values);
                                }
                        }
                };
        },

        flash: function(name) {
                var watcher = this._watchers[name];

                if (watcher) {
                        watcher.flash();
                }
        }

});


Model.watch = function(/* same arguments as this.watch() */) {
        var proto = this.prototype;

        if (!proto._globalWatchArgs) {
                proto._globalWatchArgs = [];
        }

        proto._globalWatchArgs.push(arguments);
};


FC.Model = Model;


;;

var Promise = {

        construct: function(executor) {
                var deferred = $.Deferred();
                var promise = deferred.promise();

                if (typeof executor === 'function') {
                        executor(
                                function(val) { // resolve
                                        deferred.resolve(val);
                                        attachImmediatelyResolvingThen(promise, val);
                                },
                                function() { // reject
                                        deferred.reject();
                                        attachImmediatelyRejectingThen(promise);
                                }
                        );
                }

                return promise;
        },

        resolve: function(val) {
                var deferred = $.Deferred().resolve(val);
                var promise = deferred.promise();

                attachImmediatelyResolvingThen(promise, val);

                return promise;
        },

        reject: function() {
                var deferred = $.Deferred().reject();
                var promise = deferred.promise();

                attachImmediatelyRejectingThen(promise);

                return promise;
        }

};


function attachImmediatelyResolvingThen(promise, val) {
        promise.then = function(onResolve) {
                if (typeof onResolve === 'function') {
                        return Promise.resolve(onResolve(val));
                }
                return promise;
        };
}


function attachImmediatelyRejectingThen(promise) {
        promise.then = function(onResolve, onReject) {
                if (typeof onReject === 'function') {
                        onReject();
                }
                return promise;
        };
}


FC.Promise = Promise;

;;

var TaskQueue = Class.extend(EmitterMixin, {

        q: null,
        isPaused: false,
        isRunning: false,


        constructor: function() {
                this.q = [];
        },


        queue: function(/* taskFunc, taskFunc... */) {
                this.q.push.apply(this.q, arguments); // append
                this.tryStart();
        },


        pause: function() {
                this.isPaused = true;
        },


        resume: function() {
                this.isPaused = false;
                this.tryStart();
        },


        tryStart: function() {
                if (!this.isRunning && this.canRunNext()) {
                        this.isRunning = true;
                        this.trigger('start');
                        this.runNext();
                }
        },


        canRunNext: function() {
                return !this.isPaused && this.q.length;
        },


        runNext: function() { // does not check canRunNext
                this.runTask(this.q.shift());
        },


        runTask: function(task) {
                this.runTaskFunc(task);
        },


        runTaskFunc: function(taskFunc) {
                var _this = this;
                var res = taskFunc();

                if (res && res.then) {
                        res.then(done);
                }
                else {
                        done();
                }

                function done() {
                        if (_this.canRunNext()) {
                                _this.runNext();
                        }
                        else {
                                _this.isRunning = false;
                                _this.trigger('stop');
                        }
                }
        }

});

FC.TaskQueue = TaskQueue;

;;

var RenderQueue = TaskQueue.extend({

        waitsByNamespace: null,
        waitNamespace: null,
        waitId: null,


        constructor: function(waitsByNamespace) {
                TaskQueue.call(this); // super-constructor

                this.waitsByNamespace = waitsByNamespace || {};
        },


        queue: function(taskFunc, namespace, type) {
                var task = {
                        func: taskFunc,
                        namespace: namespace,
                        type: type
                };
                var waitMs;

                if (namespace) {
                        waitMs = this.waitsByNamespace[namespace];
                }

                if (this.waitNamespace) {
                        if (namespace === this.waitNamespace && waitMs != null) {
                                this.delayWait(waitMs);
                        }
                        else {
                                this.clearWait();
                                this.tryStart();
                        }
                }

                if (this.compoundTask(task)) { // appended to queue?

                        if (!this.waitNamespace && waitMs != null) {
                                this.startWait(namespace, waitMs);
                        }
                        else {
                                this.tryStart();
                        }
                }
        },


        startWait: function(namespace, waitMs) {
                this.waitNamespace = namespace;
                this.spawnWait(waitMs);
        },


        delayWait: function(waitMs) {
                clearTimeout(this.waitId);
                this.spawnWait(waitMs);
        },


        spawnWait: function(waitMs) {
                var _this = this;

                this.waitId = setTimeout(function() {
                        _this.waitNamespace = null;
                        _this.tryStart();
                }, waitMs);
        },


        clearWait: function() {
                if (this.waitNamespace) {
                        clearTimeout(this.waitId);
                        this.waitId = null;
                        this.waitNamespace = null;
                }
        },


        canRunNext: function() {
                if (!TaskQueue.prototype.canRunNext.apply(this, arguments)) {
                        return false;
                }

                // waiting for a certain namespace to stop receiving tasks?
                if (this.waitNamespace) {

                        // if there was a different namespace task in the meantime,
                        // that forces all previously-waiting tasks to suddenly execute.
                        // TODO: find a way to do this in constant time.
                        for (var q = this.q, i = 0; i < q.length; i++) {
                                if (q[i].namespace !== this.waitNamespace) {
                                        return true; // allow execution
                                }
                        }

                        return false;
                }

                return true;
        },


        runTask: function(task) {
                this.runTaskFunc(task.func);
        },


        compoundTask: function(newTask) {
                var q = this.q;
                var shouldAppend = true;
                var i, task;

                if (newTask.namespace) {

                        if (newTask.type === 'destroy' || newTask.type === 'init') {

                                // remove all add/remove ops with same namespace, regardless of order
                                for (i = q.length - 1; i >= 0; i--) {
                                        task = q[i];

                                        if (
                                                task.namespace === newTask.namespace &&
                                                (task.type === 'add' || task.type === 'remove')
                                        ) {
                                                q.splice(i, 1); // remove task
                                        }
                                }

                                if (newTask.type === 'destroy') {
                                        // eat away final init/destroy operation
                                        if (q.length) {
                                                task = q[q.length - 1]; // last task

                                                if (task.namespace === newTask.namespace) {

                                                        // the init and our destroy cancel each other out
                                                        if (task.type === 'init') {
                                                                shouldAppend = false;
                                                                q.pop();
                                                        }
                                                        // prefer to use the destroy operation that's already present
                                                        else if (task.type === 'destroy') {
                                                                shouldAppend = false;
                                                        }
                                                }
                                        }
                                }
                                else if (newTask.type === 'init') {
                                        // eat away final init operation
                                        if (q.length) {
                                                task = q[q.length - 1]; // last task

                                                if (
                                                        task.namespace === newTask.namespace &&
                                                        task.type === 'init'
                                                ) {
                                                        // our init operation takes precedence
                                                        q.pop();
                                                }
                                        }
                                }
                        }
                }

                if (shouldAppend) {
                        q.push(newTask);
                }

                return shouldAppend;
        }

});

FC.RenderQueue = RenderQueue;

;;

/* A rectangular panel that is absolutely positioned over other content
------------------------------------------------------------------------------------------------------------------------
Options:
        - className (string)
        - content (HTML string or jQuery element set)
        - parentEl
        - top
        - left
        - right (the x coord of where the right edge should be. not a "CSS" right)
        - autoHide (boolean)
        - show (callback)
        - hide (callback)
*/

var Popover = Class.extend(ListenerMixin, {

        isHidden: true,
        options: null,
        el: null, // the container element for the popover. generated by this object
        margin: 10, // the space required between the popover and the edges of the scroll container


        constructor: function(options) {
                this.options = options || {};
        },


        // Shows the popover on the specified position. Renders it if not already
        show: function() {
                if (this.isHidden) {
                        if (!this.el) {
                                this.render();
                        }
                        this.el.show();
                        this.position();
                        this.isHidden = false;
                        this.trigger('show');
                }
        },


        // Hides the popover, through CSS, but does not remove it from the DOM
        hide: function() {
                if (!this.isHidden) {
                        this.el.hide();
                        this.isHidden = true;
                        this.trigger('hide');
                }
        },


        // Creates `this.el` and renders content inside of it
        render: function() {
                var _this = this;
                var options = this.options;

                this.el = $('<div class="fc-popover"/>')
                        .addClass(options.className || '')
                        .css({
                                // position initially to the top left to avoid creating scrollbars
                                top: 0,
                                left: 0
                        })
                        .append(options.content)
                        .appendTo(options.parentEl);

                // when a click happens on anything inside with a 'fc-close' className, hide the popover
                this.el.on('click', '.fc-close', function() {
                        _this.hide();
                });

                if (options.autoHide) {
                        this.listenTo($(document), 'mousedown', this.documentMousedown);
                }
        },


        // Triggered when the user clicks *anywhere* in the document, for the autoHide feature
        documentMousedown: function(ev) {
                // only hide the popover if the click happened outside the popover
                if (this.el && !$(ev.target).closest(this.el).length) {
                        this.hide();
                }
        },


        // Hides and unregisters any handlers
        removeElement: function() {
                this.hide();

                if (this.el) {
                        this.el.remove();
                        this.el = null;
                }

                this.stopListeningTo($(document), 'mousedown');
        },


        // Positions the popover optimally, using the top/left/right options
        position: function() {
                var options = this.options;
                var origin = this.el.offsetParent().offset();
                var width = this.el.outerWidth();
                var height = this.el.outerHeight();
                var windowEl = $(window);
                var viewportEl = getScrollParent(this.el);
                var viewportTop;
                var viewportLeft;
                var viewportOffset;
                var top; // the "position" (not "offset") values for the popover
                var left; //

                // compute top and left
                top = options.top || 0;
                if (options.left !== undefined) {
                        left = options.left;
                }
                else if (options.right !== undefined) {
                        left = options.right - width; // derive the left value from the right value
                }
                else {
                        left = 0;
                }

                if (viewportEl.is(window) || viewportEl.is(document)) { // normalize getScrollParent's result
                        viewportEl = windowEl;
                        viewportTop = 0; // the window is always at the top left
                        viewportLeft = 0; // (and .offset() won't work if called here)
                }
                else {
                        viewportOffset = viewportEl.offset();
                        viewportTop = viewportOffset.top;
                        viewportLeft = viewportOffset.left;
                }

                // if the window is scrolled, it causes the visible area to be further down
                viewportTop += windowEl.scrollTop();
                viewportLeft += windowEl.scrollLeft();

                // constrain to the view port. if constrained by two edges, give precedence to top/left
                if (options.viewportConstrain !== false) {
                        top = Math.min(top, viewportTop + viewportEl.outerHeight() - height - this.margin);
                        top = Math.max(top, viewportTop + this.margin);
                        left = Math.min(left, viewportLeft + viewportEl.outerWidth() - width - this.margin);
                        left = Math.max(left, viewportLeft + this.margin);
                }

                this.el.css({
                        top: top - origin.top,
                        left: left - origin.left
                });
        },


        // Triggers a callback. Calls a function in the option hash of the same name.
        // Arguments beyond the first `name` are forwarded on.
        // TODO: better code reuse for this. Repeat code
        trigger: function(name) {
                if (this.options[name]) {
                        this.options[name].apply(this, Array.prototype.slice.call(arguments, 1));
                }
        }

});

;;

/*
A cache for the left/right/top/bottom/width/height values for one or more elements.
Works with both offset (from topleft document) and position (from offsetParent).

options:
- els
- isHorizontal
- isVertical
*/
var CoordCache = FC.CoordCache = Class.extend({

        els: null, // jQuery set (assumed to be siblings)
        forcedOffsetParentEl: null, // options can override the natural offsetParent
        origin: null, // {left,top} position of offsetParent of els
        boundingRect: null, // constrain cordinates to this rectangle. {left,right,top,bottom} or null
        isHorizontal: false, // whether to query for left/right/width
        isVertical: false, // whether to query for top/bottom/height

        // arrays of coordinates (offsets from topleft of document)
        lefts: null,
        rights: null,
        tops: null,
        bottoms: null,


        constructor: function(options) {
                this.els = $(options.els);
                this.isHorizontal = options.isHorizontal;
                this.isVertical = options.isVertical;
                this.forcedOffsetParentEl = options.offsetParent ? $(options.offsetParent) : null;
        },


        // Queries the els for coordinates and stores them.
        // Call this method before using and of the get* methods below.
        build: function() {
                var offsetParentEl = this.forcedOffsetParentEl;
                if (!offsetParentEl && this.els.length > 0) {
                        offsetParentEl = this.els.eq(0).offsetParent();
                }

                this.origin = offsetParentEl ?
                        offsetParentEl.offset() :
                        null;

                this.boundingRect = this.queryBoundingRect();

                if (this.isHorizontal) {
                        this.buildElHorizontals();
                }
                if (this.isVertical) {
                        this.buildElVerticals();
                }
        },


        // Destroys all internal data about coordinates, freeing memory
        clear: function() {
                this.origin = null;
                this.boundingRect = null;
                this.lefts = null;
                this.rights = null;
                this.tops = null;
                this.bottoms = null;
        },


        // When called, if coord caches aren't built, builds them
        ensureBuilt: function() {
                if (!this.origin) {
                        this.build();
                }
        },


        // Populates the left/right internal coordinate arrays
        buildElHorizontals: function() {
                var lefts = [];
                var rights = [];

                this.els.each(function(i, node) {
                        var el = $(node);
                        var left = el.offset().left;
                        var width = el.outerWidth();

                        lefts.push(left);
                        rights.push(left + width);
                });

                this.lefts = lefts;
                this.rights = rights;
        },


        // Populates the top/bottom internal coordinate arrays
        buildElVerticals: function() {
                var tops = [];
                var bottoms = [];

                this.els.each(function(i, node) {
                        var el = $(node);
                        var top = el.offset().top;
                        var height = el.outerHeight();

                        tops.push(top);
                        bottoms.push(top + height);
                });

                this.tops = tops;
                this.bottoms = bottoms;
        },


        // Given a left offset (from document left), returns the index of the el that it horizontally intersects.
        // If no intersection is made, returns undefined.
        getHorizontalIndex: function(leftOffset) {
                this.ensureBuilt();

                var lefts = this.lefts;
                var rights = this.rights;
                var len = lefts.length;
                var i;

                for (i = 0; i < len; i++) {
                        if (leftOffset >= lefts[i] && leftOffset < rights[i]) {
                                return i;
                        }
                }
        },


        // Given a top offset (from document top), returns the index of the el that it vertically intersects.
        // If no intersection is made, returns undefined.
        getVerticalIndex: function(topOffset) {
                this.ensureBuilt();

                var tops = this.tops;
                var bottoms = this.bottoms;
                var len = tops.length;
                var i;

                for (i = 0; i < len; i++) {
                        if (topOffset >= tops[i] && topOffset < bottoms[i]) {
                                return i;
                        }
                }
        },


        // Gets the left offset (from document left) of the element at the given index
        getLeftOffset: function(leftIndex) {
                this.ensureBuilt();
                return this.lefts[leftIndex];
        },


        // Gets the left position (from offsetParent left) of the element at the given index
        getLeftPosition: function(leftIndex) {
                this.ensureBuilt();
                return this.lefts[leftIndex] - this.origin.left;
        },


        // Gets the right offset (from document left) of the element at the given index.
        // This value is NOT relative to the document's right edge, like the CSS concept of "right" would be.
        getRightOffset: function(leftIndex) {
                this.ensureBuilt();
                return this.rights[leftIndex];
        },


        // Gets the right position (from offsetParent left) of the element at the given index.
        // This value is NOT relative to the offsetParent's right edge, like the CSS concept of "right" would be.
        getRightPosition: function(leftIndex) {
                this.ensureBuilt();
                return this.rights[leftIndex] - this.origin.left;
        },


        // Gets the width of the element at the given index
        getWidth: function(leftIndex) {
                this.ensureBuilt();
                return this.rights[leftIndex] - this.lefts[leftIndex];
        },


        // Gets the top offset (from document top) of the element at the given index
        getTopOffset: function(topIndex) {
                this.ensureBuilt();
                return this.tops[topIndex];
        },


        // Gets the top position (from offsetParent top) of the element at the given position
        getTopPosition: function(topIndex) {
                this.ensureBuilt();
                return this.tops[topIndex] - this.origin.top;
        },

        // Gets the bottom offset (from the document top) of the element at the given index.
        // This value is NOT relative to the offsetParent's bottom edge, like the CSS concept of "bottom" would be.
        getBottomOffset: function(topIndex) {
                this.ensureBuilt();
                return this.bottoms[topIndex];
        },


        // Gets the bottom position (from the offsetParent top) of the element at the given index.
        // This value is NOT relative to the offsetParent's bottom edge, like the CSS concept of "bottom" would be.
        getBottomPosition: function(topIndex) {
                this.ensureBuilt();
                return this.bottoms[topIndex] - this.origin.top;
        },


        // Gets the height of the element at the given index
        getHeight: function(topIndex) {
                this.ensureBuilt();
                return this.bottoms[topIndex] - this.tops[topIndex];
        },


        // Bounding Rect
        // TODO: decouple this from CoordCache

        // Compute and return what the elements' bounding rectangle is, from the user's perspective.
        // Right now, only returns a rectangle if constrained by an overflow:scroll element.
        // Returns null if there are no elements
        queryBoundingRect: function() {
                var scrollParentEl;

                if (this.els.length > 0) {
                        scrollParentEl = getScrollParent(this.els.eq(0));

                        if (!scrollParentEl.is(document)) {
                                return getClientRect(scrollParentEl);
                        }
                }

                return null;
        },

        isPointInBounds: function(leftOffset, topOffset) {
                return this.isLeftInBounds(leftOffset) && this.isTopInBounds(topOffset);
        },

        isLeftInBounds: function(leftOffset) {
                return !this.boundingRect || (leftOffset >= this.boundingRect.left && leftOffset < this.boundingRect.right);
        },

        isTopInBounds: function(topOffset) {
                return !this.boundingRect || (topOffset >= this.boundingRect.top && topOffset < this.boundingRect.bottom);
        }

});

;;

/* Tracks a drag's mouse movement, firing various handlers
----------------------------------------------------------------------------------------------------------------------*/
// TODO: use Emitter

var DragListener = FC.DragListener = Class.extend(ListenerMixin, {

        options: null,
        subjectEl: null,

        // coordinates of the initial mousedown
        originX: null,
        originY: null,

        // the wrapping element that scrolls, or MIGHT scroll if there's overflow.
        // TODO: do this for wrappers that have overflow:hidden as well.
        scrollEl: null,

        isInteracting: false,
        isDistanceSurpassed: false,
        isDelayEnded: false,
        isDragging: false,
        isTouch: false,
        isGeneric: false, // initiated by 'dragstart' (jqui)

        delay: null,
        delayTimeoutId: null,
        minDistance: null,

        shouldCancelTouchScroll: true,
        scrollAlwaysKills: false,


        constructor: function(options) {
                this.options = options || {};
        },


        // Interaction (high-level)
        // -----------------------------------------------------------------------------------------------------------------


        startInteraction: function(ev, extraOptions) {

                if (ev.type === 'mousedown') {
                        if (GlobalEmitter.get().shouldIgnoreMouse()) {
                                return;
                        }
                        else if (!isPrimaryMouseButton(ev)) {
                                return;
                        }
                        else {
                                ev.preventDefault(); // prevents native selection in most browsers
                        }
                }

                if (!this.isInteracting) {

                        // process options
                        extraOptions = extraOptions || {};
                        this.delay = firstDefined(extraOptions.delay, this.options.delay, 0);
                        this.minDistance = firstDefined(extraOptions.distance, this.options.distance, 0);
                        this.subjectEl = this.options.subjectEl;

                        preventSelection($('body'));

                        this.isInteracting = true;
                        this.isTouch = getEvIsTouch(ev);
                        this.isGeneric = ev.type === 'dragstart';
                        this.isDelayEnded = false;
                        this.isDistanceSurpassed = false;

                        this.originX = getEvX(ev);
                        this.originY = getEvY(ev);
                        this.scrollEl = getScrollParent($(ev.target));

                        this.bindHandlers();
                        this.initAutoScroll();
                        this.handleInteractionStart(ev);
                        this.startDelay(ev);

                        if (!this.minDistance) {
                                this.handleDistanceSurpassed(ev);
                        }
                }
        },


        handleInteractionStart: function(ev) {
                this.trigger('interactionStart', ev);
        },


        endInteraction: function(ev, isCancelled) {
                if (this.isInteracting) {
                        this.endDrag(ev);

                        if (this.delayTimeoutId) {
                                clearTimeout(this.delayTimeoutId);
                                this.delayTimeoutId = null;
                        }

                        this.destroyAutoScroll();
                        this.unbindHandlers();

                        this.isInteracting = false;
                        this.handleInteractionEnd(ev, isCancelled);

                        allowSelection($('body'));
                }
        },


        handleInteractionEnd: function(ev, isCancelled) {
                this.trigger('interactionEnd', ev, isCancelled || false);
        },


        // Binding To DOM
        // -----------------------------------------------------------------------------------------------------------------


        bindHandlers: function() {
                // some browsers (Safari in iOS 10) don't allow preventDefault on touch events that are bound after touchstart,
                // so listen to the GlobalEmitter singleton, which is always bound, instead of the document directly.
                var globalEmitter = GlobalEmitter.get();

                if (this.isGeneric) {
                        this.listenTo($(document), { // might only work on iOS because of GlobalEmitter's bind :(
                                drag: this.handleMove,
                                dragstop: this.endInteraction
                        });
                }
                else if (this.isTouch) {
                        this.listenTo(globalEmitter, {
                                touchmove: this.handleTouchMove,
                                touchend: this.endInteraction,
                                scroll: this.handleTouchScroll
                        });
                }
                else {
                        this.listenTo(globalEmitter, {
                                mousemove: this.handleMouseMove,
                                mouseup: this.endInteraction
                        });
                }

                this.listenTo(globalEmitter, {
                        selectstart: preventDefault, // don't allow selection while dragging
                        contextmenu: preventDefault // long taps would open menu on Chrome dev tools
                });
        },


        unbindHandlers: function() {
                this.stopListeningTo(GlobalEmitter.get());
                this.stopListeningTo($(document)); // for isGeneric
        },


        // Drag (high-level)
        // -----------------------------------------------------------------------------------------------------------------


        // extraOptions ignored if drag already started
        startDrag: function(ev, extraOptions) {
                this.startInteraction(ev, extraOptions); // ensure interaction began

                if (!this.isDragging) {
                        this.isDragging = true;
                        this.handleDragStart(ev);
                }
        },


        handleDragStart: function(ev) {
                this.trigger('dragStart', ev);
        },


        handleMove: function(ev) {
                var dx = getEvX(ev) - this.originX;
                var dy = getEvY(ev) - this.originY;
                var minDistance = this.minDistance;
                var distanceSq; // current distance from the origin, squared

                if (!this.isDistanceSurpassed) {
                        distanceSq = dx * dx + dy * dy;
                        if (distanceSq >= minDistance * minDistance) { // use pythagorean theorem
                                this.handleDistanceSurpassed(ev);
                        }
                }

                if (this.isDragging) {
                        this.handleDrag(dx, dy, ev);
                }
        },


        // Called while the mouse is being moved and when we know a legitimate drag is taking place
        handleDrag: function(dx, dy, ev) {
                this.trigger('drag', dx, dy, ev);
                this.updateAutoScroll(ev); // will possibly cause scrolling
        },


        endDrag: function(ev) {
                if (this.isDragging) {
                        this.isDragging = false;
                        this.handleDragEnd(ev);
                }
        },


        handleDragEnd: function(ev) {
                this.trigger('dragEnd', ev);
        },


        // Delay
        // -----------------------------------------------------------------------------------------------------------------


        startDelay: function(initialEv) {
                var _this = this;

                if (this.delay) {
                        this.delayTimeoutId = setTimeout(function() {
                                _this.handleDelayEnd(initialEv);
                        }, this.delay);
                }
                else {
                        this.handleDelayEnd(initialEv);
                }
        },


        handleDelayEnd: function(initialEv) {
                this.isDelayEnded = true;

                if (this.isDistanceSurpassed) {
                        this.startDrag(initialEv);
                }
        },


        // Distance
        // -----------------------------------------------------------------------------------------------------------------


        handleDistanceSurpassed: function(ev) {
                this.isDistanceSurpassed = true;

                if (this.isDelayEnded) {
                        this.startDrag(ev);
                }
        },


        // Mouse / Touch
        // -----------------------------------------------------------------------------------------------------------------


        handleTouchMove: function(ev) {

                // prevent inertia and touchmove-scrolling while dragging
                if (this.isDragging && this.shouldCancelTouchScroll) {
                        ev.preventDefault();
                }

                this.handleMove(ev);
        },


        handleMouseMove: function(ev) {
                this.handleMove(ev);
        },


        // Scrolling (unrelated to auto-scroll)
        // -----------------------------------------------------------------------------------------------------------------


        handleTouchScroll: function(ev) {
                // if the drag is being initiated by touch, but a scroll happens before
                // the drag-initiating delay is over, cancel the drag
                if (!this.isDragging || this.scrollAlwaysKills) {
                        this.endInteraction(ev, true); // isCancelled=true
                }
        },


        // Utils
        // -----------------------------------------------------------------------------------------------------------------


        // Triggers a callback. Calls a function in the option hash of the same name.
        // Arguments beyond the first `name` are forwarded on.
        trigger: function(name) {
                if (this.options[name]) {
                        this.options[name].apply(this, Array.prototype.slice.call(arguments, 1));
                }
                // makes _methods callable by event name. TODO: kill this
                if (this['_' + name]) {
                        this['_' + name].apply(this, Array.prototype.slice.call(arguments, 1));
                }
        }


});

;;
/*
this.scrollEl is set in DragListener
*/
DragListener.mixin({

        isAutoScroll: false,

        scrollBounds: null, // { top, bottom, left, right }
        scrollTopVel: null, // pixels per second
        scrollLeftVel: null, // pixels per second
        scrollIntervalId: null, // ID of setTimeout for scrolling animation loop

        // defaults
        scrollSensitivity: 30, // pixels from edge for scrolling to start
        scrollSpeed: 200, // pixels per second, at maximum speed
        scrollIntervalMs: 50, // millisecond wait between scroll increment


        initAutoScroll: function() {
                var scrollEl = this.scrollEl;

                this.isAutoScroll =
                        this.options.scroll &&
                        scrollEl &&
                        !scrollEl.is(window) &&
                        !scrollEl.is(document);

                if (this.isAutoScroll) {
                        // debounce makes sure rapid calls don't happen
                        this.listenTo(scrollEl, 'scroll', debounce(this.handleDebouncedScroll, 100));
                }
        },


        destroyAutoScroll: function() {
                this.endAutoScroll(); // kill any animation loop

                // remove the scroll handler if there is a scrollEl
                if (this.isAutoScroll) {
                        this.stopListeningTo(this.scrollEl, 'scroll'); // will probably get removed by unbindHandlers too :(
                }
        },


        // Computes and stores the bounding rectangle of scrollEl
        computeScrollBounds: function() {
                if (this.isAutoScroll) {
                        this.scrollBounds = getOuterRect(this.scrollEl);
                        // TODO: use getClientRect in future. but prevents auto scrolling when on top of scrollbars
                }
        },


        // Called when the dragging is in progress and scrolling should be updated
        updateAutoScroll: function(ev) {
                var sensitivity = this.scrollSensitivity;
                var bounds = this.scrollBounds;
                var topCloseness, bottomCloseness;
                var leftCloseness, rightCloseness;
                var topVel = 0;
                var leftVel = 0;

                if (bounds) { // only scroll if scrollEl exists

                        // compute closeness to edges. valid range is from 0.0 - 1.0
                        topCloseness = (sensitivity - (getEvY(ev) - bounds.top)) / sensitivity;
                        bottomCloseness = (sensitivity - (bounds.bottom - getEvY(ev))) / sensitivity;
                        leftCloseness = (sensitivity - (getEvX(ev) - bounds.left)) / sensitivity;
                        rightCloseness = (sensitivity - (bounds.right - getEvX(ev))) / sensitivity;

                        // translate vertical closeness into velocity.
                        // mouse must be completely in bounds for velocity to happen.
                        if (topCloseness >= 0 && topCloseness <= 1) {
                                topVel = topCloseness * this.scrollSpeed * -1; // negative. for scrolling up
                        }
                        else if (bottomCloseness >= 0 && bottomCloseness <= 1) {
                                topVel = bottomCloseness * this.scrollSpeed;
                        }

                        // translate horizontal closeness into velocity
                        if (leftCloseness >= 0 && leftCloseness <= 1) {
                                leftVel = leftCloseness * this.scrollSpeed * -1; // negative. for scrolling left
                        }
                        else if (rightCloseness >= 0 && rightCloseness <= 1) {
                                leftVel = rightCloseness * this.scrollSpeed;
                        }
                }

                this.setScrollVel(topVel, leftVel);
        },


        // Sets the speed-of-scrolling for the scrollEl
        setScrollVel: function(topVel, leftVel) {

                this.scrollTopVel = topVel;
                this.scrollLeftVel = leftVel;

                this.constrainScrollVel(); // massages into realistic values

                // if there is non-zero velocity, and an animation loop hasn't already started, then START
                if ((this.scrollTopVel || this.scrollLeftVel) && !this.scrollIntervalId) {
                        this.scrollIntervalId = setInterval(
                                proxy(this, 'scrollIntervalFunc'), // scope to `this`
                                this.scrollIntervalMs
                        );
                }
        },


        // Forces scrollTopVel and scrollLeftVel to be zero if scrolling has already gone all the way
        constrainScrollVel: function() {
                var el = this.scrollEl;

                if (this.scrollTopVel < 0) { // scrolling up?
                        if (el.scrollTop() <= 0) { // already scrolled all the way up?
                                this.scrollTopVel = 0;
                        }
                }
                else if (this.scrollTopVel > 0) { // scrolling down?
                        if (el.scrollTop() + el[0].clientHeight >= el[0].scrollHeight) { // already scrolled all the way down?
                                this.scrollTopVel = 0;
                        }
                }

                if (this.scrollLeftVel < 0) { // scrolling left?
                        if (el.scrollLeft() <= 0) { // already scrolled all the left?
                                this.scrollLeftVel = 0;
                        }
                }
                else if (this.scrollLeftVel > 0) { // scrolling right?
                        if (el.scrollLeft() + el[0].clientWidth >= el[0].scrollWidth) { // already scrolled all the way right?
                                this.scrollLeftVel = 0;
                        }
                }
        },


        // This function gets called during every iteration of the scrolling animation loop
        scrollIntervalFunc: function() {
                var el = this.scrollEl;
                var frac = this.scrollIntervalMs / 1000; // considering animation frequency, what the vel should be mult'd by

                // change the value of scrollEl's scroll
                if (this.scrollTopVel) {
                        el.scrollTop(el.scrollTop() + this.scrollTopVel * frac);
                }
                if (this.scrollLeftVel) {
                        el.scrollLeft(el.scrollLeft() + this.scrollLeftVel * frac);
                }

                this.constrainScrollVel(); // since the scroll values changed, recompute the velocities

                // if scrolled all the way, which causes the vels to be zero, stop the animation loop
                if (!this.scrollTopVel && !this.scrollLeftVel) {
                        this.endAutoScroll();
                }
        },


        // Kills any existing scrolling animation loop
        endAutoScroll: function() {
                if (this.scrollIntervalId) {
                        clearInterval(this.scrollIntervalId);
                        this.scrollIntervalId = null;

                        this.handleScrollEnd();
                }
        },


        // Get called when the scrollEl is scrolled (NOTE: this is delayed via debounce)
        handleDebouncedScroll: function() {
                // recompute all coordinates, but *only* if this is *not* part of our scrolling animation
                if (!this.scrollIntervalId) {
                        this.handleScrollEnd();
                }
        },


        // Called when scrolling has stopped, whether through auto scroll, or the user scrolling
        handleScrollEnd: function() {
        }

});
;;

/* Tracks mouse movements over a component and raises events about which hit the mouse is over.
------------------------------------------------------------------------------------------------------------------------
options:
- subjectEl
- subjectCenter
*/

var HitDragListener = DragListener.extend({

        component: null, // converts coordinates to hits
                // methods: hitsNeeded, hitsNotNeeded, queryHit

        origHit: null, // the hit the mouse was over when listening started
        hit: null, // the hit the mouse is over
        coordAdjust: null, // delta that will be added to the mouse coordinates when computing collisions


        constructor: function(component, options) {
                DragListener.call(this, options); // call the super-constructor

                this.component = component;
        },


        // Called when drag listening starts (but a real drag has not necessarily began).
        // ev might be undefined if dragging was started manually.
        handleInteractionStart: function(ev) {
                var subjectEl = this.subjectEl;
                var subjectRect;
                var origPoint;
                var point;

                this.component.hitsNeeded();
                this.computeScrollBounds(); // for autoscroll

                if (ev) {
                        origPoint = { left: getEvX(ev), top: getEvY(ev) };
                        point = origPoint;

                        // constrain the point to bounds of the element being dragged
                        if (subjectEl) {
                                subjectRect = getOuterRect(subjectEl); // used for centering as well
                                point = constrainPoint(point, subjectRect);
                        }

                        this.origHit = this.queryHit(point.left, point.top);

                        // treat the center of the subject as the collision point?
                        if (subjectEl && this.options.subjectCenter) {

                                // only consider the area the subject overlaps the hit. best for large subjects.
                                // TODO: skip this if hit didn't supply left/right/top/bottom
                                if (this.origHit) {
                                        subjectRect = intersectRects(this.origHit, subjectRect) ||
                                                subjectRect; // in case there is no intersection
                                }

                                point = getRectCenter(subjectRect);
                        }

                        this.coordAdjust = diffPoints(point, origPoint); // point - origPoint
                }
                else {
                        this.origHit = null;
                        this.coordAdjust = null;
                }

                // call the super-method. do it after origHit has been computed
                DragListener.prototype.handleInteractionStart.apply(this, arguments);
        },


        // Called when the actual drag has started
        handleDragStart: function(ev) {
                var hit;

                DragListener.prototype.handleDragStart.apply(this, arguments); // call the super-method

                // might be different from this.origHit if the min-distance is large
                hit = this.queryHit(getEvX(ev), getEvY(ev));

                // report the initial hit the mouse is over
                // especially important if no min-distance and drag starts immediately
                if (hit) {
                        this.handleHitOver(hit);
                }
        },


        // Called when the drag moves
        handleDrag: function(dx, dy, ev) {
                var hit;

                DragListener.prototype.handleDrag.apply(this, arguments); // call the super-method

                hit = this.queryHit(getEvX(ev), getEvY(ev));

                if (!isHitsEqual(hit, this.hit)) { // a different hit than before?
                        if (this.hit) {
                                this.handleHitOut();
                        }
                        if (hit) {
                                this.handleHitOver(hit);
                        }
                }
        },


        // Called when dragging has been stopped
        handleDragEnd: function() {
                this.handleHitDone();
                DragListener.prototype.handleDragEnd.apply(this, arguments); // call the super-method
        },


        // Called when a the mouse has just moved over a new hit
        handleHitOver: function(hit) {
                var isOrig = isHitsEqual(hit, this.origHit);

                this.hit = hit;

                this.trigger('hitOver', this.hit, isOrig, this.origHit);
        },


        // Called when the mouse has just moved out of a hit
        handleHitOut: function() {
                if (this.hit) {
                        this.trigger('hitOut', this.hit);
                        this.handleHitDone();
                        this.hit = null;
                }
        },


        // Called after a hitOut. Also called before a dragStop
        handleHitDone: function() {
                if (this.hit) {
                        this.trigger('hitDone', this.hit);
                }
        },


        // Called when the interaction ends, whether there was a real drag or not
        handleInteractionEnd: function() {
                DragListener.prototype.handleInteractionEnd.apply(this, arguments); // call the super-method

                this.origHit = null;
                this.hit = null;

                this.component.hitsNotNeeded();
        },


        // Called when scrolling has stopped, whether through auto scroll, or the user scrolling
        handleScrollEnd: function() {
                DragListener.prototype.handleScrollEnd.apply(this, arguments); // call the super-method

                // hits' absolute positions will be in new places after a user's scroll.
                // HACK for recomputing.
                if (this.isDragging) {
                        this.component.releaseHits();
                        this.component.prepareHits();
                }
        },


        // Gets the hit underneath the coordinates for the given mouse event
        queryHit: function(left, top) {

                if (this.coordAdjust) {
                        left += this.coordAdjust.left;
                        top += this.coordAdjust.top;
                }

                return this.component.queryHit(left, top);
        }

});


// Returns `true` if the hits are identically equal. `false` otherwise. Must be from the same component.
// Two null values will be considered equal, as two "out of the component" states are the same.
function isHitsEqual(hit0, hit1) {

        if (!hit0 && !hit1) {
                return true;
        }

        if (hit0 && hit1) {
                return hit0.component === hit1.component &&
                        isHitPropsWithin(hit0, hit1) &&
                        isHitPropsWithin(hit1, hit0); // ensures all props are identical
        }

        return false;
}


// Returns true if all of subHit's non-standard properties are within superHit
function isHitPropsWithin(subHit, superHit) {
        for (var propName in subHit) {
                if (!/^(component|left|right|top|bottom)$/.test(propName)) {
                        if (subHit[propName] !== superHit[propName]) {
                                return false;
                        }
                }
        }
        return true;
}

;;

/*
Listens to document and window-level user-interaction events, like touch events and mouse events,
and fires these events as-is to whoever is observing a GlobalEmitter.
Best when used as a singleton via GlobalEmitter.get()

Normalizes mouse/touch events. For examples:
- ignores the the simulated mouse events that happen after a quick tap: mousemove+mousedown+mouseup+click
- compensates for various buggy scenarios where a touchend does not fire
*/

FC.touchMouseIgnoreWait = 500;

var GlobalEmitter = Class.extend(ListenerMixin, EmitterMixin, {

        isTouching: false,
        mouseIgnoreDepth: 0,
        handleScrollProxy: null,


        bind: function() {
                var _this = this;

                this.listenTo($(document), {
                        touchstart: this.handleTouchStart,
                        touchcancel: this.handleTouchCancel,
                        touchend: this.handleTouchEnd,
                        mousedown: this.handleMouseDown,
                        mousemove: this.handleMouseMove,
                        mouseup: this.handleMouseUp,
                        click: this.handleClick,
                        selectstart: this.handleSelectStart,
                        contextmenu: this.handleContextMenu
                });

                // because we need to call preventDefault
                // because https://www.chromestatus.com/features/5093566007214080
                // TODO: investigate performance because this is a global handler
                window.addEventListener(
                        'touchmove',
                        this.handleTouchMoveProxy = function(ev) {
                                _this.handleTouchMove($.Event(ev));
                        },
                        { passive: false } // allows preventDefault()
                );

                // attach a handler to get called when ANY scroll action happens on the page.
                // this was impossible to do with normal on/off because 'scroll' doesn't bubble.
                // http://stackoverflow.com/a/32954565/96342
                window.addEventListener(
                        'scroll',
                        this.handleScrollProxy = function(ev) {
                                _this.handleScroll($.Event(ev));
                        },
                        true // useCapture
                );
        },

        unbind: function() {
                this.stopListeningTo($(document));

                window.removeEventListener(
                        'touchmove',
                        this.handleTouchMoveProxy
                );

                window.removeEventListener(
                        'scroll',
                        this.handleScrollProxy,
                        true // useCapture
                );
        },


        // Touch Handlers
        // -----------------------------------------------------------------------------------------------------------------

        handleTouchStart: function(ev) {

                // if a previous touch interaction never ended with a touchend, then implicitly end it,
                // but since a new touch interaction is about to begin, don't start the mouse ignore period.
                this.stopTouch(ev, true); // skipMouseIgnore=true

                this.isTouching = true;
                this.trigger('touchstart', ev);
        },

        handleTouchMove: function(ev) {
                if (this.isTouching) {
                        this.trigger('touchmove', ev);
                }
        },

        handleTouchCancel: function(ev) {
                if (this.isTouching) {
                        this.trigger('touchcancel', ev);

                        // Have touchcancel fire an artificial touchend. That way, handlers won't need to listen to both.
                        // If touchend fires later, it won't have any effect b/c isTouching will be false.
                        this.stopTouch(ev);
                }
        },

        handleTouchEnd: function(ev) {
                this.stopTouch(ev);
        },


        // Mouse Handlers
        // -----------------------------------------------------------------------------------------------------------------

        handleMouseDown: function(ev) {
                if (!this.shouldIgnoreMouse()) {
                        this.trigger('mousedown', ev);
                }
        },

        handleMouseMove: function(ev) {
                if (!this.shouldIgnoreMouse()) {
                        this.trigger('mousemove', ev);
                }
        },

        handleMouseUp: function(ev) {
                if (!this.shouldIgnoreMouse()) {
                        this.trigger('mouseup', ev);
                }
        },

        handleClick: function(ev) {
                if (!this.shouldIgnoreMouse()) {
                        this.trigger('click', ev);
                }
        },


        // Misc Handlers
        // -----------------------------------------------------------------------------------------------------------------

        handleSelectStart: function(ev) {
                this.trigger('selectstart', ev);
        },

        handleContextMenu: function(ev) {
                this.trigger('contextmenu', ev);
        },

        handleScroll: function(ev) {
                this.trigger('scroll', ev);
        },


        // Utils
        // -----------------------------------------------------------------------------------------------------------------

        stopTouch: function(ev, skipMouseIgnore) {
                if (this.isTouching) {
                        this.isTouching = false;
                        this.trigger('touchend', ev);

                        if (!skipMouseIgnore) {
                                this.startTouchMouseIgnore();
                        }
                }
        },

        startTouchMouseIgnore: function() {
                var _this = this;
                var wait = FC.touchMouseIgnoreWait;

                if (wait) {
                        this.mouseIgnoreDepth++;
                        setTimeout(function() {
                                _this.mouseIgnoreDepth--;
                        }, wait);
                }
        },

        shouldIgnoreMouse: function() {
                return this.isTouching || Boolean(this.mouseIgnoreDepth);
        }

});


// Singleton
// ---------------------------------------------------------------------------------------------------------------------

(function() {
        var globalEmitter = null;
        var neededCount = 0;


        // gets the singleton
        GlobalEmitter.get = function() {

                if (!globalEmitter) {
                        globalEmitter = new GlobalEmitter();
                        globalEmitter.bind();
                }

                return globalEmitter;
        };


        // called when an object knows it will need a GlobalEmitter in the near future.
        GlobalEmitter.needed = function() {
                GlobalEmitter.get(); // ensures globalEmitter
                neededCount++;
        };


        // called when the object that originally called needed() doesn't need a GlobalEmitter anymore.
        GlobalEmitter.unneeded = function() {
                neededCount--;

                if (!neededCount) { // nobody else needs it
                        globalEmitter.unbind();
                        globalEmitter = null;
                }
        };

})();

;;

/* Creates a clone of an element and lets it track the mouse as it moves
----------------------------------------------------------------------------------------------------------------------*/

var MouseFollower = Class.extend(ListenerMixin, {

        options: null,

        sourceEl: null, // the element that will be cloned and made to look like it is dragging
        el: null, // the clone of `sourceEl` that will track the mouse
        parentEl: null, // the element that `el` (the clone) will be attached to

        // the initial position of el, relative to the offset parent. made to match the initial offset of sourceEl
        top0: null,
        left0: null,

        // the absolute coordinates of the initiating touch/mouse action
        y0: null,
        x0: null,

        // the number of pixels the mouse has moved from its initial position
        topDelta: null,
        leftDelta: null,

        isFollowing: false,
        isHidden: false,
        isAnimating: false, // doing the revert animation?

        constructor: function(sourceEl, options) {
                this.options = options = options || {};
                this.sourceEl = sourceEl;
                this.parentEl = options.parentEl ? $(options.parentEl) : sourceEl.parent(); // default to sourceEl's parent
        },


        // Causes the element to start following the mouse
        start: function(ev) {
                if (!this.isFollowing) {
                        this.isFollowing = true;

                        this.y0 = getEvY(ev);
                        this.x0 = getEvX(ev);
                        this.topDelta = 0;
                        this.leftDelta = 0;

                        if (!this.isHidden) {
                                this.updatePosition();
                        }

                        if (getEvIsTouch(ev)) {
                                this.listenTo($(document), 'touchmove', this.handleMove);
                        }
                        else {
                                this.listenTo($(document), 'mousemove', this.handleMove);
                        }
                }
        },


        // Causes the element to stop following the mouse. If shouldRevert is true, will animate back to original position.
        // `callback` gets invoked when the animation is complete. If no animation, it is invoked immediately.
        stop: function(shouldRevert, callback) {
                var _this = this;
                var revertDuration = this.options.revertDuration;

                function complete() { // might be called by .animate(), which might change `this` context
                        _this.isAnimating = false;
                        _this.removeElement();

                        _this.top0 = _this.left0 = null; // reset state for future updatePosition calls

                        if (callback) {
                                callback();
                        }
                }

                if (this.isFollowing && !this.isAnimating) { // disallow more than one stop animation at a time
                        this.isFollowing = false;

                        this.stopListeningTo($(document));

                        if (shouldRevert && revertDuration && !this.isHidden) { // do a revert animation?
                                this.isAnimating = true;
                                this.el.animate({
                                        top: this.top0,
                                        left: this.left0
                                }, {
                                        duration: revertDuration,
                                        complete: complete
                                });
                        }
                        else {
                                complete();
                        }
                }
        },


        // Gets the tracking element. Create it if necessary
        getEl: function() {
                var el = this.el;

                if (!el) {
                        el = this.el = this.sourceEl.clone()
                                .addClass(this.options.additionalClass || '')
                                .css({
                                        position: 'absolute',
                                        visibility: '', // in case original element was hidden (commonly through hideEvents())
                                        display: this.isHidden ? 'none' : '', // for when initially hidden
                                        margin: 0,
                                        right: 'auto', // erase and set width instead
                                        bottom: 'auto', // erase and set height instead
                                        width: this.sourceEl.width(), // explicit height in case there was a 'right' value
                                        height: this.sourceEl.height(), // explicit width in case there was a 'bottom' value
                                        opacity: this.options.opacity || '',
                                        zIndex: this.options.zIndex
                                });

                        // we don't want long taps or any mouse interaction causing selection/menus.
                        // would use preventSelection(), but that prevents selectstart, causing problems.
                        el.addClass('fc-unselectable');

                        el.appendTo(this.parentEl);
                }

                return el;
        },


        // Removes the tracking element if it has already been created
        removeElement: function() {
                if (this.el) {
                        this.el.remove();
                        this.el = null;
                }
        },


        // Update the CSS position of the tracking element
        updatePosition: function() {
                var sourceOffset;
                var origin;

                this.getEl(); // ensure this.el

                // make sure origin info was computed
                if (this.top0 === null) {
                        sourceOffset = this.sourceEl.offset();
                        origin = this.el.offsetParent().offset();
                        this.top0 = sourceOffset.top - origin.top;
                        this.left0 = sourceOffset.left - origin.left;
                }

                this.el.css({
                        top: this.top0 + this.topDelta,
                        left: this.left0 + this.leftDelta
                });
        },


        // Gets called when the user moves the mouse
        handleMove: function(ev) {
                this.topDelta = getEvY(ev) - this.y0;
                this.leftDelta = getEvX(ev) - this.x0;

                if (!this.isHidden) {
                        this.updatePosition();
                }
        },


        // Temporarily makes the tracking element invisible. Can be called before following starts
        hide: function() {
                if (!this.isHidden) {
                        this.isHidden = true;
                        if (this.el) {
                                this.el.hide();
                        }
                }
        },


        // Show the tracking element after it has been temporarily hidden
        show: function() {
                if (this.isHidden) {
                        this.isHidden = false;
                        this.updatePosition();
                        this.getEl().show();
                }
        }

});

;;

var ChronoComponent = Model.extend({

        children: null,

        el: null, // the view's containing element. set by Calendar(?)

        // frequently accessed options
        isRTL: false,
        nextDayThreshold: null,


        constructor: function() {
                Model.call(this);

                this.children = [];

                this.nextDayThreshold = moment.duration(this.opt('nextDayThreshold'));
                this.isRTL = this.opt('isRTL');
        },


        addChild: function(chronoComponent) {
                this.children.push(chronoComponent);
        },


        // Options
        // -----------------------------------------------------------------------------------------------------------------


        opt: function(name) {
                // subclasses must implement
        },


        publiclyTrigger: function(/**/) {
                var calendar = this._getCalendar();

                return calendar.publiclyTrigger.apply(calendar, arguments);
        },


        hasPublicHandlers: function(/**/) {
                var calendar = this._getCalendar();

                return calendar.hasPublicHandlers.apply(calendar, arguments);
        },


        // Element
        // -----------------------------------------------------------------------------------------------------------------


        // Sets the container element that the view should render inside of, does global DOM-related initializations,
        // and renders all the non-date-related content inside.
        setElement: function(el) {
                this.el = el;
                this.bindGlobalHandlers();
                this.renderSkeleton();
        },


        // Removes the view's container element from the DOM, clearing any content beforehand.
        // Undoes any other DOM-related attachments.
        removeElement: function() {
                this.unrenderSkeleton();
                this.unbindGlobalHandlers();

                this.el.remove();
                // NOTE: don't null-out this.el in case the View was destroyed within an API callback.
                // We don't null-out the View's other jQuery element references upon destroy,
                //  so we shouldn't kill this.el either.
        },


        bindGlobalHandlers: function() {
        },


        unbindGlobalHandlers: function() {
        },


        // Skeleton
        // -----------------------------------------------------------------------------------------------------------------


        // Renders the basic structure of the view before any content is rendered
        renderSkeleton: function() {
                // subclasses should implement
        },


        // Unrenders the basic structure of the view
        unrenderSkeleton: function() {
                // subclasses should implement
        },


        // Date Low-level Rendering
        // -----------------------------------------------------------------------------------------------------------------


        // date-cell content only
        renderDates: function() {
                // subclasses should implement
        },


        // date-cell content only
        unrenderDates: function() {
                // subclasses should override
        },


        // Now-Indicator
        // -----------------------------------------------------------------------------------------------------------------


        // Returns a string unit, like 'second' or 'minute' that defined how often the current time indicator
        // should be refreshed. If something falsy is returned, no time indicator is rendered at all.
        getNowIndicatorUnit: function() {
                // subclasses should implement
        },


        // Renders a current time indicator at the given datetime
        renderNowIndicator: function(date) {
                this.callChildren('renderNowIndicator', date);
        },


        // Undoes the rendering actions from renderNowIndicator
        unrenderNowIndicator: function() {
                this.callChildren('unrenderNowIndicator');
        },


        // Business Hours
        // ---------------------------------------------------------------------------------------------------------------


        // Renders business-hours onto the view. Assumes updateSize has already been called.
        renderBusinessHours: function() {
                this.callChildren('renderBusinessHours');
        },


        // Unrenders previously-rendered business-hours
        unrenderBusinessHours: function() {
                this.callChildren('unrenderBusinessHours');
        },


        // Event Low-level Rendering
        // -----------------------------------------------------------------------------------------------------------------


        // Renders the events onto the view.
        // TODO: eventually rename to `renderEvents` once legacy is gone.
        renderEventsPayload: function(eventsPayload) {
                this.callChildren('renderEventsPayload', eventsPayload);
        },


        // Removes event elements from the view.
        unrenderEvents: function() {
                this.callChildren('unrenderEvents');

                // we DON'T need to call updateHeight() because
                // a renderEventsPayload() call always happens after this, which will eventually call updateHeight()
        },


        // Retrieves all segment objects that are rendered in the view
        getEventSegs: function() {
                var children = this.children;
                var segs = [];
                var i;

                for (i = 0; i < children.length; i++) {
                        segs.push.apply( // append
                                segs,
                                children[i].getEventSegs()
                        );
                }

                return segs;
        },


        // Drag-n-Drop Rendering (for both events and external elements)
        // ---------------------------------------------------------------------------------------------------------------


        // Renders a visual indication of a event or external-element drag over the given drop zone.
        // If an external-element, seg will be `null`.
        // Must return elements used for any mock events.
        renderDrag: function(eventFootprints, seg) {
                var dragEls = null;
                var children = this.children;
                var i;
                var childDragEls;

                for (i = 0; i < children.length; i++) {
                        childDragEls = children[i].renderDrag(eventFootprints, seg);

                        if (childDragEls) {
                                if (!dragEls) {
                                        dragEls = childDragEls;
                                }
                                else {
                                        dragEls = dragEls.add(childDragEls);
                                }
                        }
                }

                return dragEls;
        },


        // Unrenders a visual indication of an event or external-element being dragged.
        unrenderDrag: function() {
                this.callChildren('unrenderDrag');
        },


        // Selection
        // ---------------------------------------------------------------------------------------------------------------


        // Renders a visual indication of the selection
        // TODO: rename to `renderSelection` after legacy is gone
        renderSelectionFootprint: function(componentFootprint) {
                this.callChildren('renderSelectionFootprint', componentFootprint);
        },


        // Unrenders a visual indication of selection
        unrenderSelection: function() {
                this.callChildren('unrenderSelection');
        },


        // Hit Areas
        // ---------------------------------------------------------------------------------------------------------------


        hitsNeeded: function() {
                this.callChildren('hitsNeeded');
        },


        hitsNotNeeded: function() {
                this.callChildren('hitsNotNeeded');
        },


        // Called before one or more queryHit calls might happen. Should prepare any cached coordinates for queryHit
        prepareHits: function() {
                this.callChildren('prepareHits');
        },


        // Called when queryHit calls have subsided. Good place to clear any coordinate caches.
        releaseHits: function() {
                this.callChildren('releaseHits');
        },


        // Given coordinates from the topleft of the document, return data about the date-related area underneath.
        // Can return an object with arbitrary properties (although top/right/left/bottom are encouraged).
        // Must have a `grid` property, a reference to this current grid. TODO: avoid this
        // The returned object will be processed by getHitFootprint and getHitEl.
        queryHit: function(leftOffset, topOffset) {
                var children = this.children;
                var i;
                var hit;

                for (i = 0; i < children.length; i++) {
                        hit = children[i].queryHit(leftOffset, topOffset);

                        if (hit) {
                                break;
                        }
                }

                return hit;
        },



        // Event Drag-n-Drop
        // ---------------------------------------------------------------------------------------------------------------


        // Computes if the given event is allowed to be dragged by the user
        isEventDefDraggable: function(eventDef) {
                return this.isEventDefStartEditable(eventDef);
        },


        isEventDefStartEditable: function(eventDef) {
                var isEditable = eventDef.isStartExplicitlyEditable();

                if (isEditable == null) {
                        isEditable = this.opt('eventStartEditable');

                        if (isEditable == null) {
                                isEditable = this.isEventDefGenerallyEditable(eventDef);
                        }
                }

                return isEditable;
        },


        isEventDefGenerallyEditable: function(eventDef) {
                var isEditable = eventDef.isExplicitlyEditable();

                if (isEditable == null) {
                        isEditable = this.opt('editable');
                }

                return isEditable;
        },


        // Event Resizing
        // ---------------------------------------------------------------------------------------------------------------


        // Computes if the given event is allowed to be resized from its starting edge
        isEventDefResizableFromStart: function(eventDef) {
                return this.opt('eventResizableFromStart') && this.isEventDefResizable(eventDef);
        },


        // Computes if the given event is allowed to be resized from its ending edge
        isEventDefResizableFromEnd: function(eventDef) {
                return this.isEventDefResizable(eventDef);
        },


        // Computes if the given event is allowed to be resized by the user at all
        isEventDefResizable: function(eventDef) {
                var isResizable = eventDef.isDurationExplicitlyEditable();

                if (isResizable == null) {
                        isResizable = this.opt('eventDurationEditable');

                        if (isResizable == null) {
                                isResizable = this.isEventDefGenerallyEditable(eventDef);
                        }
                }
                return isResizable;
        },


        // Foreground Segment Rendering
        // ---------------------------------------------------------------------------------------------------------------


        // Renders foreground event segments onto the grid. May return a subset of segs that were rendered.
        renderFgSegs: function(segs) {
                // subclasses must implement
        },


        // Unrenders all currently rendered foreground segments
        unrenderFgSegs: function() {
                // subclasses must implement
        },


        // Renders and assigns an `el` property for each foreground event segment.
        // Only returns segments that successfully rendered.
        // A utility that subclasses may use.
        renderFgSegEls: function(segs, disableResizing) {
                var _this = this;
                var hasEventRenderHandlers = this.hasPublicHandlers('eventRender');
                var html = '';
                var renderedSegs = [];
                var i;

                if (segs.length) { // don't build an empty html string

                        // build a large concatenation of event segment HTML
                        for (i = 0; i < segs.length; i++) {
                                html += this.fgSegHtml(segs[i], disableResizing);
                        }

                        // Grab individual elements from the combined HTML string. Use each as the default rendering.
                        // Then, compute the 'el' for each segment. An el might be null if the eventRender callback returned false.
                        $(html).each(function(i, node) {
                                var seg = segs[i];
                                var el = $(node);

                                if (hasEventRenderHandlers) { // optimization
                                        el = _this.filterEventRenderEl(seg.footprint, el);
                                }

                                if (el) {
                                        el.data('fc-seg', seg); // used by handlers
                                        seg.el = el;
                                        renderedSegs.push(seg);
                                }
                        });
                }

                return renderedSegs;
        },


        // Generates the HTML for the default rendering of a foreground event segment. Used by renderFgSegEls()
        fgSegHtml: function(seg, disableResizing) {
                // subclasses should implement
        },


        // Given an event and the default element used for rendering, returns the element that should actually be used.
        // Basically runs events and elements through the eventRender hook.
        filterEventRenderEl: function(eventFootprint, el) {
                var legacy = eventFootprint.getEventLegacy();

                var custom = this.publiclyTrigger('eventRender', {
                        context: legacy,
                        args: [ legacy, el, this._getView() ]
                });

                if (custom === false) { // means don't render at all
                        el = null;
                }
                else if (custom && custom !== true) {
                        el = $(custom);
                }

                return el;
        },


        // Navigation
        // ----------------------------------------------------------------------------------------------------------------


        // Generates HTML for an anchor to another view into the calendar.
        // Will either generate an <a> tag or a non-clickable <span> tag, depending on enabled settings.
        // `gotoOptions` can either be a moment input, or an object with the form:
        // { date, type, forceOff }
        // `type` is a view-type like "day" or "week". default value is "day".
        // `attrs` and `innerHtml` are use to generate the rest of the HTML tag.
        buildGotoAnchorHtml: function(gotoOptions, attrs, innerHtml) {
                var date, type, forceOff;
                var finalOptions;

                if ($.isPlainObject(gotoOptions)) {
                        date = gotoOptions.date;
                        type = gotoOptions.type;
                        forceOff = gotoOptions.forceOff;
                }
                else {
                        date = gotoOptions; // a single moment input
                }
                date = FC.moment(date); // if a string, parse it

                finalOptions = { // for serialization into the link
                        date: date.format('YYYY-MM-DD'),
                        type: type || 'day'
                };

                if (typeof attrs === 'string') {
                        innerHtml = attrs;
                        attrs = null;
                }

                attrs = attrs ? ' ' + attrsToStr(attrs) : ''; // will have a leading space
                innerHtml = innerHtml || '';

                if (!forceOff && this.opt('navLinks')) {
                        return '<a' + attrs +
                                ' data-goto="' + htmlEscape(JSON.stringify(finalOptions)) + '">' +
                                innerHtml +
                                '</a>';
                }
                else {
                        return '<span' + attrs + '>' +
                                innerHtml +
                                '</span>';
                }
        },


        // Date Formatting Utils
        // ---------------------------------------------------------------------------------------------------------------


        // Utility for formatting a range. Accepts a range object, formatting string, and optional separator.
        // Displays all-day ranges naturally, with an inclusive end. Takes the current isRTL into account.
        // The timezones of the dates within `range` will be respected.
        formatRange: function(range, isAllDay, formatStr, separator) {
                var end = range.end;

                if (isAllDay) {
                        end = end.clone().subtract(1); // convert to inclusive. last ms of previous day
                }

                return formatRange(range.start, end, formatStr, separator, this.isRTL);
        },


        getAllDayHtml: function() {
                return this.opt('allDayHtml') || htmlEscape(this.opt('allDayText'));
        },


        // Computes HTML classNames for a single-day element
        getDayClasses: function(date, noThemeHighlight) {
                var view = this._getView();
                var classes = [];
                var today;

                if (!view.activeUnzonedRange.containsDate(date)) {
                        classes.push('fc-disabled-day'); // TODO: jQuery UI theme?
                }
                else {
                        classes.push('fc-' + dayIDs[date.day()]);

                        if (view.isDateInOtherMonth(date)) { // TODO: use ChronoComponent subclass somehow
                                classes.push('fc-other-month');
                        }

                        today = view.calendar.getNow();

                        if (date.isSame(today, 'day')) {
                                classes.push('fc-today');

                                if (noThemeHighlight !== true) {
                                        classes.push(view.calendar.theme.getClass('today'));
                                }
                        }
                        else if (date < today) {
                                classes.push('fc-past');
                        }
                        else {
                                classes.push('fc-future');
                        }
                }

                return classes;
        },


        // Date Utils
        // ---------------------------------------------------------------------------------------------------------------


        // Returns the date range of the full days the given range visually appears to occupy.
        // Returns a plain object with start/end, NOT an UnzonedRange!
        computeDayRange: function(unzonedRange) {
                var calendar = this._getCalendar();
                var startDay = calendar.msToUtcMoment(unzonedRange.startMs, true); // the beginning of the day the range starts
                var end = calendar.msToUtcMoment(unzonedRange.endMs);
                var endTimeMS = +end.time(); // # of milliseconds into `endDay`
                var endDay = end.clone().stripTime(); // the beginning of the day the range exclusively ends

                // If the end time is actually inclusively part of the next day and is equal to or
                // beyond the next day threshold, adjust the end to be the exclusive end of `endDay`.
                // Otherwise, leaving it as inclusive will cause it to exclude `endDay`.
                if (endTimeMS && endTimeMS >= this.nextDayThreshold) {
                        endDay.add(1, 'days');
                }

                // If end is within `startDay` but not past nextDayThreshold, assign the default duration of one day.
                if (endDay <= startDay) {
                        endDay = startDay.clone().add(1, 'days');
                }

                return { start: startDay, end: endDay };
        },


        // Does the given range visually appear to occupy more than one day?
        isMultiDayRange: function(unzonedRange) {
                var dayRange = this.computeDayRange(unzonedRange);

                return dayRange.end.diff(dayRange.start, 'days') > 1;
        },


        // Utils
        // ---------------------------------------------------------------------------------------------------------------


        callChildren: function(methodName) {
                var args = Array.prototype.slice.call(arguments, 1);
                var children = this.children;
                var i, child;

                for (i = 0; i < children.length; i++) {
                        child = children[i];
                        child[methodName].apply(child, args);
                }
        },


        _getCalendar: function() { // TODO: strip out. move to generic parent.
                return this.calendar || this.view.calendar;
        },


        _getView: function() { // TODO: strip out. move to generic parent.
                return this.view;
        }

});

;;

/* An abstract class comprised of a "grid" of areas that each represent a specific datetime
----------------------------------------------------------------------------------------------------------------------
Contains:
- hit system
- range->footprint->seg pipeline
- initializing day click
- initializing selection system
- initializing mouse/touch handlers for everything
- initializing event rendering-related options
*/

var Grid = FC.Grid = ChronoComponent.extend({

        // self-config, overridable by subclasses
        hasDayInteractions: true, // can user click/select ranges of time?

        view: null, // a View object
        isRTL: null, // shortcut to the view's isRTL option

        unzonedRange: null,

        hitsNeededDepth: 0, // necessary because multiple callers might need the same hits

        dayClickListener: null,
        daySelectListener: null,
        segDragListener: null,
        segResizeListener: null,
        externalDragListener: null,


        constructor: function(view) {
                this.view = view;

                ChronoComponent.call(this);

                this.initFillInternals();

                this.dayClickListener = this.buildDayClickListener();
                this.daySelectListener = this.buildDaySelectListener();
        },


        opt: function(name) {
                return this.view.opt(name);
        },


        /* Dates
        ------------------------------------------------------------------------------------------------------------------*/


        // Tells the grid about what period of time to display.
        // Any date-related internal data should be generated.
        setRange: function(unzonedRange) {
                this.unzonedRange = unzonedRange;

                this.rangeUpdated();
                this.processRangeOptions();
        },


        // Called when internal variables that rely on the range should be updated
        rangeUpdated: function() {
        },


        // Updates values that rely on options and also relate to range
        processRangeOptions: function() {
                var displayEventTime;
                var displayEventEnd;

                this.eventTimeFormat = // for Grid.event-rendering.js
                        this.opt('eventTimeFormat') ||
                        this.opt('timeFormat') || // deprecated
                        this.computeEventTimeFormat();

                displayEventTime = this.opt('displayEventTime');
                if (displayEventTime == null) {
                        displayEventTime = this.computeDisplayEventTime(); // might be based off of range
                }

                displayEventEnd = this.opt('displayEventEnd');
                if (displayEventEnd == null) {
                        displayEventEnd = this.computeDisplayEventEnd(); // might be based off of range
                }

                this.displayEventTime = displayEventTime;
                this.displayEventEnd = displayEventEnd;
        },



        /* Hit Area
        ------------------------------------------------------------------------------------------------------------------*/


        hitsNeeded: function() {
                if (!(this.hitsNeededDepth++)) {
                        this.prepareHits();
                }
        },


        hitsNotNeeded: function() {
                if (this.hitsNeededDepth && !(--this.hitsNeededDepth)) {
                        this.releaseHits();
                }
        },


        getSafeHitFootprint: function(hit) {
                var footprint = this.getHitFootprint(hit);

                if (!this.view.activeUnzonedRange.containsRange(footprint.unzonedRange)) {
                        return null;
                }

                return footprint;
        },


        getHitFootprint: function(hit) {
        },


        // Given position-level information about a date-related area within the grid,
        // should return a jQuery element that best represents it. passed to dayClick callback.
        getHitEl: function(hit) {
        },


        /* Rendering
        ------------------------------------------------------------------------------------------------------------------*/


        // Sets the container element that the grid should render inside of.
        // Does other DOM-related initializations.
        setElement: function(el) {
                ChronoComponent.prototype.setElement.apply(this, arguments);

                if (this.hasDayInteractions) {
                        preventSelection(el);

                        this.bindDayHandler('touchstart', this.dayTouchStart);
                        this.bindDayHandler('mousedown', this.dayMousedown);
                }

                // attach event-element-related handlers. in Grid.events
                // same garbage collection note as above.
                this.bindSegHandlers();
        },


        bindDayHandler: function(name, handler) {
                var _this = this;

                // attach a handler to the grid's root element.
                // jQuery will take care of unregistering them when removeElement gets called.
                this.el.on(name, function(ev) {
                        if (
                                !$(ev.target).is(
                                        _this.segSelector + ',' + // directly on an event element
                                        _this.segSelector + ' *,' + // within an event element
                                        '.fc-more,' + // a "more.." link
                                        'a[data-goto]' // a clickable nav link
                                )
                        ) {
                                return handler.call(_this, ev);
                        }
                });
        },


        // Removes the grid's container element from the DOM. Undoes any other DOM-related attachments.
        // DOES NOT remove any content beforehand (doesn't clear events or call unrenderDates), unlike View
        removeElement: function() {
                ChronoComponent.prototype.removeElement.apply(this, arguments);

                this.clearDragListeners();
        },


        /* Handlers
        ------------------------------------------------------------------------------------------------------------------*/


        // Binds DOM handlers to elements that reside outside the grid, such as the document
        bindGlobalHandlers: function() {
                ChronoComponent.prototype.bindGlobalHandlers.apply(this, arguments);

                this.listenTo($(document), {
                        dragstart: this.externalDragStart, // jqui
                        sortstart: this.externalDragStart // jqui
                });
        },


        // Unbinds DOM handlers from elements that reside outside the grid
        unbindGlobalHandlers: function() {
                ChronoComponent.prototype.unbindGlobalHandlers.apply(this, arguments);

                this.stopListeningTo($(document));
        },


        // Process a mousedown on an element that represents a day. For day clicking and selecting.
        dayMousedown: function(ev) {

                // HACK
                // This will still work even though bindDayHandler doesn't use GlobalEmitter.
                if (GlobalEmitter.get().shouldIgnoreMouse()) {
                        return;
                }

                this.dayClickListener.startInteraction(ev);

                if (this.opt('selectable')) {
                        this.daySelectListener.startInteraction(ev, {
                                distance: this.opt('selectMinDistance')
                        });
                }
        },


        dayTouchStart: function(ev) {
                var view = this.view;
                var selectLongPressDelay;

                // On iOS (and Android?) when a new selection is initiated overtop another selection,
                // the touchend never fires because the elements gets removed mid-touch-interaction (my theory).
                // HACK: simply don't allow this to happen.
                // ALSO: prevent selection when an *event* is already raised.
                if (view.isSelected || view.selectedEvent) {
                        return;
                }

                selectLongPressDelay = this.opt('selectLongPressDelay');
                if (selectLongPressDelay == null) {
                        selectLongPressDelay = this.opt('longPressDelay'); // fallback
                }

                this.dayClickListener.startInteraction(ev);

                if (this.opt('selectable')) {
                        this.daySelectListener.startInteraction(ev, {
                                delay: selectLongPressDelay
                        });
                }
        },


        // Kills all in-progress dragging.
        // Useful for when public API methods that result in re-rendering are invoked during a drag.
        // Also useful for when touch devices misbehave and don't fire their touchend.
        clearDragListeners: function() {
                this.dayClickListener.endInteraction();
                this.daySelectListener.endInteraction();

                if (this.segDragListener) {
                        this.segDragListener.endInteraction(); // will clear this.segDragListener
                }
                if (this.segResizeListener) {
                        this.segResizeListener.endInteraction(); // will clear this.segResizeListener
                }
                if (this.externalDragListener) {
                        this.externalDragListener.endInteraction(); // will clear this.externalDragListener
                }
        },


        /* Highlight
        ------------------------------------------------------------------------------------------------------------------*/


        // Renders an emphasis on the given date range. Given a span (unzoned start/end and other misc data)
        renderHighlight: function(componentFootprint) {
                this.renderFill('highlight', this.componentFootprintToSegs(componentFootprint));
        },


        // Unrenders the emphasis on a date range
        unrenderHighlight: function() {
                this.unrenderFill('highlight');
        },


        /* Converting eventRange -> eventFootprint
        ------------------------------------------------------------------------------------------------------------------*/


        eventRangesToEventFootprints: function(eventRanges) {
                var eventFootprints = [];
                var i;

                for (i = 0; i < eventRanges.length; i++) {
                        eventFootprints.push.apply(eventFootprints,
                                this.eventRangeToEventFootprints(eventRanges[i])
                        );
                }

                return eventFootprints;
        },


        // Given an event's unzoned date range, return an array of eventSpan objects.
        // eventSpan - { start, end, isStart, isEnd, otherthings... }
        // Subclasses can override.
        // Subclasses are obligated to forward eventRange.isStart/isEnd to the resulting spans.
        // TODO: somehow more DRY with Calendar::eventRangeToEventFootprints
        eventRangeToEventFootprints: function(eventRange) {
                return [
                        new EventFootprint(
                                new ComponentFootprint(
                                        eventRange.unzonedRange,
                                        eventRange.eventDef.isAllDay()
                                ),
                                eventRange.eventDef,
                                eventRange.eventInstance // might not exist
                        )
                ];
        },


        /* Converting componentFootprint/eventFootprint -> segs
        ------------------------------------------------------------------------------------------------------------------*/


        eventFootprintsToSegs: function(eventFootprints) {
                var segs = [];
                var i;

                for (i = 0; i < eventFootprints.length; i++) {
                        segs.push.apply(segs,
                                this.eventFootprintToSegs(eventFootprints[i])
                        );
                }

                return segs;
        },


        // Given an event's span (unzoned start/end and other misc data), and the event itself,
        // slices into segments and attaches event-derived properties to them.
        // eventSpan - { start, end, isStart, isEnd, otherthings... }
        // constraintRange allow additional clipping. optional. eventually remove this.
        eventFootprintToSegs: function(eventFootprint, constraintRange) {
                var unzonedRange = eventFootprint.componentFootprint.unzonedRange;
                var segs;
                var i, seg;

                if (constraintRange) {
                        unzonedRange = unzonedRange.intersect(constraintRange);
                }

                segs = this.componentFootprintToSegs(eventFootprint.componentFootprint);

                for (i = 0; i < segs.length; i++) {
                        seg = segs[i];

                        if (!unzonedRange.isStart) {
                                seg.isStart = false;
                        }
                        if (!unzonedRange.isEnd) {
                                seg.isEnd = false;
                        }

                        seg.footprint = eventFootprint;
                        // TODO: rename to seg.eventFootprint
                }

                return segs;
        },


        componentFootprintToSegs: function(componentFootprint) {
                // subclasses must implement
        }

});

;;

Grid.mixin({

        // Creates a listener that tracks the user's drag across day elements, for day clicking.
        buildDayClickListener: function() {
                var _this = this;
                var dayClickHit; // null if invalid dayClick

                var dragListener = new HitDragListener(this, {
                        scroll: this.opt('dragScroll'),
                        interactionStart: function() {
                                dayClickHit = dragListener.origHit;
                        },
                        hitOver: function(hit, isOrig, origHit) {
                                // if user dragged to another cell at any point, it can no longer be a dayClick
                                if (!isOrig) {
                                        dayClickHit = null;
                                }
                        },
                        hitOut: function() { // called before mouse moves to a different hit OR moved out of all hits
                                dayClickHit = null;
                        },
                        interactionEnd: function(ev, isCancelled) {
                                var componentFootprint;

                                if (!isCancelled && dayClickHit) {
                                        componentFootprint = _this.getSafeHitFootprint(dayClickHit);

                                        if (componentFootprint) {
                                                _this.view.triggerDayClick(componentFootprint, _this.getHitEl(dayClickHit), ev);
                                        }
                                }
                        }
                });

                // because dayClickListener won't be called with any time delay, "dragging" will begin immediately,
                // which will kill any touchmoving/scrolling. Prevent this.
                dragListener.shouldCancelTouchScroll = false;

                dragListener.scrollAlwaysKills = true;

                return dragListener;
        }

});

;;

Grid.mixin({

        // Creates a listener that tracks the user's drag across day elements, for day selecting.
        buildDaySelectListener: function() {
                var _this = this;
                var selectionFootprint; // null if invalid selection

                var dragListener = new HitDragListener(this, {
                        scroll: this.opt('dragScroll'),
                        interactionStart: function() {
                                selectionFootprint = null;
                        },
                        dragStart: function() {
                                _this.view.unselect(); // since we could be rendering a new selection, we want to clear any old one
                        },
                        hitOver: function(hit, isOrig, origHit) {
                                var origHitFootprint;
                                var hitFootprint;

                                if (origHit) { // click needs to have started on a hit

                                        origHitFootprint = _this.getSafeHitFootprint(origHit);
                                        hitFootprint = _this.getSafeHitFootprint(hit);

                                        if (origHitFootprint && hitFootprint) {
                                                selectionFootprint = _this.computeSelection(origHitFootprint, hitFootprint);
                                        }
                                        else {
                                                selectionFootprint = null;
                                        }

                                        if (selectionFootprint) {
                                                _this.renderSelectionFootprint(selectionFootprint);
                                        }
                                        else if (selectionFootprint === false) {
                                                disableCursor();
                                        }
                                }
                        },
                        hitOut: function() { // called before mouse moves to a different hit OR moved out of all hits
                                selectionFootprint = null;
                                _this.unrenderSelection();
                        },
                        hitDone: function() { // called after a hitOut OR before a dragEnd
                                enableCursor();
                        },
                        interactionEnd: function(ev, isCancelled) {
                                if (!isCancelled && selectionFootprint) {
                                        // the selection will already have been rendered. just report it
                                        _this.view.reportSelection(selectionFootprint, ev);
                                }
                        }
                });

                return dragListener;
        },


        // Renders a visual indication of a selection. Will highlight by default but can be overridden by subclasses.
        // Given a span (unzoned start/end and other misc data)
        renderSelectionFootprint: function(componentFootprint) {
                this.renderHighlight(componentFootprint);
        },


        // Unrenders any visual indications of a selection. Will unrender a highlight by default.
        unrenderSelection: function() {
                this.unrenderHighlight();
        },


        // Given the first and last date-spans of a selection, returns another date-span object.
        // Subclasses can override and provide additional data in the span object. Will be passed to renderSelectionFootprint().
        // Will return false if the selection is invalid and this should be indicated to the user.
        // Will return null/undefined if a selection invalid but no error should be reported.
        computeSelection: function(footprint0, footprint1) {
                var wholeFootprint = this.computeSelectionFootprint(footprint0, footprint1);

                if (wholeFootprint && !this.isSelectionFootprintAllowed(wholeFootprint)) {
                        return false;
                }

                return wholeFootprint;
        },


        // Given two spans, must return the combination of the two.
        // TODO: do this separation of concerns (combining VS validation) for event dnd/resize too.
        // Assumes both footprints are non-open-ended.
        computeSelectionFootprint: function(footprint0, footprint1) {
                var ms = [
                        footprint0.unzonedRange.startMs,
                        footprint0.unzonedRange.endMs,
                        footprint1.unzonedRange.startMs,
                        footprint1.unzonedRange.endMs
                ];

                ms.sort(compareNumbers);

                return new ComponentFootprint(
                        new UnzonedRange(ms[0], ms[3]),
                        footprint0.isAllDay
                );
        },


        isSelectionFootprintAllowed: function(componentFootprint) {
                return this.view.validUnzonedRange.containsRange(componentFootprint.unzonedRange) &&
                        this.view.calendar.isSelectionFootprintAllowed(componentFootprint);
        }

});

;;

Grid.mixin({

        // Generates an array of classNames to be used for the rendering business hours overlay. Called by the fill system.
        // Called by fillSegHtml.
        businessHoursSegClasses: function(seg) {
                return [ 'fc-nonbusiness', 'fc-bgevent' ];
        },


        // Compute business hour segs for the grid's current date range.
        // Caller must ask if whole-day business hours are needed.
        buildBusinessHourSegs: function(wholeDay) {
                return this.eventFootprintsToSegs(
                        this.buildBusinessHourEventFootprints(wholeDay)
                );
        },


        // Compute business hour *events* for the grid's current date range.
        // Caller must ask if whole-day business hours are needed.
        // FOR RENDERING
        buildBusinessHourEventFootprints: function(wholeDay) {
                var calendar = this.view.calendar;

                return this._buildBusinessHourEventFootprints(wholeDay, calendar.opt('businessHours'));
        },


        _buildBusinessHourEventFootprints: function(wholeDay, businessHourDef) {
                var calendar = this.view.calendar;
                var eventInstanceGroup;
                var eventRanges;

                eventInstanceGroup = calendar.buildBusinessInstanceGroup(
                        wholeDay,
                        businessHourDef,
                        this.unzonedRange
                );

                if (eventInstanceGroup) {
                        eventRanges = eventInstanceGroup.sliceRenderRanges(
                                this.unzonedRange,
                                calendar
                        );
                }
                else {
                        eventRanges = [];
                }

                return this.eventRangesToEventFootprints(eventRanges);
        }

});

;;

Grid.mixin({

        segs: null, // the *event* segments currently rendered in the grid. TODO: rename to `eventSegs`

        // derived from options
        // TODO: move initialization from Grid.js
        eventTimeFormat: null,
        displayEventTime: null,
        displayEventEnd: null,


        // Generates the format string used for event time text, if not explicitly defined by 'timeFormat'
        computeEventTimeFormat: function() {
                return this.opt('smallTimeFormat');
        },


        // Determines whether events should have their end times displayed, if not explicitly defined by 'displayEventTime'.
        // Only applies to non-all-day events.
        computeDisplayEventTime: function() {
                return true;
        },


        // Determines whether events should have their end times displayed, if not explicitly defined by 'displayEventEnd'
        computeDisplayEventEnd: function() {
                return true;
        },


        renderEventsPayload: function(eventsPayload) {
                var id, eventInstanceGroup;
                var eventRenderRanges;
                var eventFootprints;
                var eventSegs;
                var bgSegs = [];
                var fgSegs = [];

                for (id in eventsPayload) {
                        eventInstanceGroup = eventsPayload[id];

                        eventRenderRanges = eventInstanceGroup.sliceRenderRanges(this.view.activeUnzonedRange);
                        eventFootprints = this.eventRangesToEventFootprints(eventRenderRanges);
                        eventSegs = this.eventFootprintsToSegs(eventFootprints);

                        if (eventInstanceGroup.getEventDef().hasBgRendering()) {
                                bgSegs.push.apply(bgSegs, // append
                                        eventSegs
                                );
                        }
                        else {
                                fgSegs.push.apply(fgSegs, // append
                                        eventSegs
                                );
                        }
                }

                this.segs = [].concat( // record all segs
                        this.renderBgSegs(bgSegs) || bgSegs,
                        this.renderFgSegs(fgSegs) || fgSegs
                );
        },


        // Unrenders all events currently rendered on the grid
        unrenderEvents: function() {
                this.handleSegMouseout(); // trigger an eventMouseout if user's mouse is over an event
                this.clearDragListeners();

                this.unrenderFgSegs();
                this.unrenderBgSegs();

                this.segs = null;
        },


        // Retrieves all rendered segment objects currently rendered on the grid
        getEventSegs: function() {
                return this.segs || [];
        },


        // Background Segment Rendering
        // ---------------------------------------------------------------------------------------------------------------
        // TODO: move this to ChronoComponent, but without fill


        // Renders the given background event segments onto the grid.
        // Returns a subset of the segs that were actually rendered.
        renderBgSegs: function(segs) {
                return this.renderFill('bgEvent', segs);
        },


        // Unrenders all the currently rendered background event segments
        unrenderBgSegs: function() {
                this.unrenderFill('bgEvent');
        },


        // Renders a background event element, given the default rendering. Called by the fill system.
        bgEventSegEl: function(seg, el) {
                return this.filterEventRenderEl(seg.footprint, el);
        },


        // Generates an array of classNames to be used for the default rendering of a background event.
        // Called by fillSegHtml.
        bgEventSegClasses: function(seg) {
                var eventDef = seg.footprint.eventDef;

                return [ 'fc-bgevent' ].concat(
                        eventDef.className,
                        eventDef.source.className
                );
        },


        // Generates a semicolon-separated CSS string to be used for the default rendering of a background event.
        // Called by fillSegHtml.
        bgEventSegCss: function(seg) {
                return {
                        'background-color': this.getSegSkinCss(seg)['background-color']
                };
        },


        /* Rendering Utils
        ------------------------------------------------------------------------------------------------------------------*/


        // Compute the text that should be displayed on an event's element.
        // `range` can be the Event object itself, or something range-like, with at least a `start`.
        // If event times are disabled, or the event has no time, will return a blank string.
        // If not specified, formatStr will default to the eventTimeFormat setting,
        // and displayEnd will default to the displayEventEnd setting.
        getEventTimeText: function(eventFootprint, formatStr, displayEnd) {
                return this._getEventTimeText(
                        eventFootprint.eventInstance.dateProfile.start,
                        eventFootprint.eventInstance.dateProfile.end,
                        eventFootprint.componentFootprint.isAllDay,
                        formatStr,
                        displayEnd
                );
        },


        _getEventTimeText: function(start, end, isAllDay, formatStr, displayEnd) {

                if (formatStr == null) {
                        formatStr = this.eventTimeFormat;
                }

                if (displayEnd == null) {
                        displayEnd = this.displayEventEnd;
                }

                if (this.displayEventTime && !isAllDay) {
                        if (displayEnd && end) {
                                return this.view.formatRange(
                                        { start: start, end: end },
                                        false, // allDay
                                        formatStr
                                );
                        }
                        else {
                                return start.format(formatStr);
                        }
                }

                return '';
        },


        // Generic utility for generating the HTML classNames for an event segment's element
        getSegClasses: function(seg, isDraggable, isResizable) {
                var view = this.view;
                var classes = [
                        'fc-event',
                        seg.isStart ? 'fc-start' : 'fc-not-start',
                        seg.isEnd ? 'fc-end' : 'fc-not-end'
                ].concat(this.getSegCustomClasses(seg));

                if (isDraggable) {
                        classes.push('fc-draggable');
                }
                if (isResizable) {
                        classes.push('fc-resizable');
                }

                // event is currently selected? attach a className.
                if (view.isEventDefSelected(seg.footprint.eventDef)) {
                        classes.push('fc-selected');
                }

                return classes;
        },


        // List of classes that were defined by the caller of the API in some way
        getSegCustomClasses: function(seg) {
                var eventDef = seg.footprint.eventDef;

                return [].concat(
                        eventDef.className, // guaranteed to be an array
                        eventDef.source.className
                );
        },


        // Utility for generating event skin-related CSS properties
        getSegSkinCss: function(seg) {
                return {
                        'background-color': this.getSegBackgroundColor(seg),
                        'border-color': this.getSegBorderColor(seg),
                        color: this.getSegTextColor(seg)
                };
        },


        // Queries for caller-specified color, then falls back to default
        getSegBackgroundColor: function(seg) {
                var eventDef = seg.footprint.eventDef;

                return eventDef.backgroundColor ||
                        eventDef.color ||
                        this.getSegDefaultBackgroundColor(seg);
        },


        getSegDefaultBackgroundColor: function(seg) {
                var source = seg.footprint.eventDef.source;

                return source.backgroundColor ||
                        source.color ||
                        this.opt('eventBackgroundColor') ||
                        this.opt('eventColor');
        },


        // Queries for caller-specified color, then falls back to default
        getSegBorderColor: function(seg) {
                var eventDef = seg.footprint.eventDef;

                return eventDef.borderColor ||
                        eventDef.color ||
                        this.getSegDefaultBorderColor(seg);
        },


        getSegDefaultBorderColor: function(seg) {
                var source = seg.footprint.eventDef.source;

                return source.borderColor ||
                        source.color ||
                        this.opt('eventBorderColor') ||
                        this.opt('eventColor');
        },


        // Queries for caller-specified color, then falls back to default
        getSegTextColor: function(seg) {
                var eventDef = seg.footprint.eventDef;

                return eventDef.textColor ||
                        this.getSegDefaultTextColor(seg);
        },


        getSegDefaultTextColor: function(seg) {
                var source = seg.footprint.eventDef.source;

                return source.textColor ||
                        this.opt('eventTextColor');
        },


        sortEventSegs: function(segs) {
                segs.sort(proxy(this, 'compareEventSegs'));
        },


        // A cmp function for determining which segments should take visual priority
        compareEventSegs: function(seg1, seg2) {
                var f1 = seg1.footprint.componentFootprint;
                var r1 = f1.unzonedRange;
                var f2 = seg2.footprint.componentFootprint;
                var r2 = f2.unzonedRange;

                return r1.startMs - r2.startMs || // earlier events go first
                        (r2.endMs - r2.startMs) - (r1.endMs - r1.startMs) || // tie? longer events go first
                        f2.isAllDay - f1.isAllDay || // tie? put all-day events first (booleans cast to 0/1)
                        compareByFieldSpecs(
                                seg1.footprint.eventDef,
                                seg2.footprint.eventDef,
                                this.view.eventOrderSpecs
                        );
        }

});

;;

/*
Contains:
- event clicking/mouseover/mouseout
- things that are common to event dragging AND resizing
- event helper rendering
*/
Grid.mixin({

        // self-config, overridable by subclasses
        segSelector: '.fc-event-container > *', // what constitutes an event element?

        mousedOverSeg: null, // the segment object the user's mouse is over. null if over nothing

        // if defined, holds the unit identified (ex: "year" or "month") that determines the level of granularity
        // of the date areas. if not defined, assumes to be day and time granularity.
        // TODO: port isTimeScale into same system?
        largeUnit: null,


        // Diffs the two dates, returning a duration, based on granularity of the grid
        // TODO: port isTimeScale into this system?
        diffDates: function(a, b) {
                if (this.largeUnit) {
                        return diffByUnit(a, b, this.largeUnit);
                }
                else {
                        return diffDayTime(a, b);
                }
        },


        // Attaches event-element-related handlers for *all* rendered event segments of the view.
        bindSegHandlers: function() {
                this.bindSegHandlersToEl(this.el);
        },


        // Attaches event-element-related handlers to an arbitrary container element. leverages bubbling.
        bindSegHandlersToEl: function(el) {
                this.bindSegHandlerToEl(el, 'touchstart', this.handleSegTouchStart);
                this.bindSegHandlerToEl(el, 'mouseenter', this.handleSegMouseover);
                this.bindSegHandlerToEl(el, 'mouseleave', this.handleSegMouseout);
                this.bindSegHandlerToEl(el, 'mousedown', this.handleSegMousedown);
                this.bindSegHandlerToEl(el, 'click', this.handleSegClick);
        },


        // Executes a handler for any a user-interaction on a segment.
        // Handler gets called with (seg, ev), and with the `this` context of the Grid
        bindSegHandlerToEl: function(el, name, handler) {
                var _this = this;

                el.on(name, this.segSelector, function(ev) {
                        var seg = $(this).data('fc-seg'); // grab segment data. put there by View::renderEventsPayload

                        // only call the handlers if there is not a drag/resize in progress
                        if (seg && !_this.isDraggingSeg && !_this.isResizingSeg) {
                                return handler.call(_this, seg, ev); // context will be the Grid
                        }
                });
        },


        handleSegClick: function(seg, ev) {
                var res = this.publiclyTrigger('eventClick', { // can return `false` to cancel
                        context: seg.el[0],
                        args: [ seg.footprint.getEventLegacy(), ev, this.view ]
                });

                if (res === false) {
                        ev.preventDefault();
                }
        },


        // Updates internal state and triggers handlers for when an event element is moused over
        handleSegMouseover: function(seg, ev) {
                if (
                        !GlobalEmitter.get().shouldIgnoreMouse() &&
                        !this.mousedOverSeg
                ) {
                        this.mousedOverSeg = seg;

                        if (this.view.isEventDefResizable(seg.footprint.eventDef)) {
                                seg.el.addClass('fc-allow-mouse-resize');
                        }

                        this.publiclyTrigger('eventMouseover', {
                                context: seg.el[0],
                                args: [ seg.footprint.getEventLegacy(), ev, this.view ]
                        });
                }
        },


        // Updates internal state and triggers handlers for when an event element is moused out.
        // Can be given no arguments, in which case it will mouseout the segment that was previously moused over.
        handleSegMouseout: function(seg, ev) {
                ev = ev || {}; // if given no args, make a mock mouse event

                if (this.mousedOverSeg) {
                        seg = seg || this.mousedOverSeg; // if given no args, use the currently moused-over segment
                        this.mousedOverSeg = null;

                        if (this.view.isEventDefResizable(seg.footprint.eventDef)) {
                                seg.el.removeClass('fc-allow-mouse-resize');
                        }

                        this.publiclyTrigger('eventMouseout', {
                                context: seg.el[0],
                                args: [ seg.footprint.getEventLegacy(), ev, this.view ]
                        });
                }
        },


        handleSegMousedown: function(seg, ev) {
                var isResizing = this.startSegResize(seg, ev, { distance: 5 });

                if (!isResizing && this.view.isEventDefDraggable(seg.footprint.eventDef)) {
                        this.buildSegDragListener(seg)
                                .startInteraction(ev, {
                                        distance: 5
                                });
                }
        },


        handleSegTouchStart: function(seg, ev) {
                var view = this.view;
                var eventDef = seg.footprint.eventDef;
                var isSelected = view.isEventDefSelected(eventDef);
                var isDraggable = view.isEventDefDraggable(eventDef);
                var isResizable = view.isEventDefResizable(eventDef);
                var isResizing = false;
                var dragListener;
                var eventLongPressDelay;

                if (isSelected && isResizable) {
                        // only allow resizing of the event is selected
                        isResizing = this.startSegResize(seg, ev);
                }

                if (!isResizing && (isDraggable || isResizable)) { // allowed to be selected?

                        eventLongPressDelay = this.opt('eventLongPressDelay');
                        if (eventLongPressDelay == null) {
                                eventLongPressDelay = this.opt('longPressDelay'); // fallback
                        }

                        dragListener = isDraggable ?
                                this.buildSegDragListener(seg) :
                                this.buildSegSelectListener(seg); // seg isn't draggable, but still needs to be selected

                        dragListener.startInteraction(ev, { // won't start if already started
                                delay: isSelected ? 0 : eventLongPressDelay // do delay if not already selected
                        });
                }
        },


        // seg isn't draggable, but let's use a generic DragListener
        // simply for the delay, so it can be selected.
        // Has side effect of setting/unsetting `segDragListener`
        buildSegSelectListener: function(seg) {
                var _this = this;
                var view = this.view;
                var eventDef = seg.footprint.eventDef;
                var eventInstance = seg.footprint.eventInstance; // null for inverse-background events

                if (this.segDragListener) {
                        return this.segDragListener;
                }

                var dragListener = this.segDragListener = new DragListener({
                        dragStart: function(ev) {
                                if (
                                        dragListener.isTouch &&
                                        !view.isEventDefSelected(eventDef) &&
                                        eventInstance
                                ) {
                                        // if not previously selected, will fire after a delay. then, select the event
                                        view.selectEventInstance(eventInstance);
                                }
                        },
                        interactionEnd: function(ev) {
                                _this.segDragListener = null;
                        }
                });

                return dragListener;
        },


        // is it allowed, in relation to the view's validRange?
        // NOTE: very similar to isExternalInstanceGroupAllowed
        isEventInstanceGroupAllowed: function(eventInstanceGroup) {
                var eventFootprints = this.eventRangesToEventFootprints(eventInstanceGroup.getAllEventRanges());
                var i;

                for (i = 0; i < eventFootprints.length; i++) {
                        // TODO: just use getAllEventRanges directly
                        if (!this.view.validUnzonedRange.containsRange(eventFootprints[i].componentFootprint.unzonedRange)) {
                                return false;
                        }
                }

                return this.view.calendar.isEventInstanceGroupAllowed(eventInstanceGroup);
        },


        /* Event Helper
        ------------------------------------------------------------------------------------------------------------------*/
        // TODO: should probably move this to Grid.events, like we did event dragging / resizing


        renderHelperEventFootprints: function(eventFootprints, sourceSeg) {
                return this.renderHelperEventFootprintEls(eventFootprints, sourceSeg)
                        .addClass('fc-helper');
        },


        renderHelperEventFootprintEls: function(eventFootprints, sourceSeg) {
                // Subclasses must implement.
                // Must return all mock event elements.
        },


        // Unrenders a mock event
        // TODO: have this in ChronoComponent
        unrenderHelper: function() {
                // subclasses must implement
        },


        fabricateEventFootprint: function(componentFootprint) {
                var calendar = this.view.calendar;
                var eventDateProfile = calendar.footprintToDateProfile(componentFootprint);
                var dummyEvent = new SingleEventDef(new EventSource(calendar));
                var dummyInstance;

                dummyEvent.dateProfile = eventDateProfile;
                dummyInstance = dummyEvent.buildInstance();

                return new EventFootprint(componentFootprint, dummyEvent, dummyInstance);
        }

});

;;

/*
Wired up via Grid.event-interation.js by calling
buildSegDragListener
*/
Grid.mixin({

        isDraggingSeg: false, // is a segment being dragged? boolean


        // Builds a listener that will track user-dragging on an event segment.
        // Generic enough to work with any type of Grid.
        // Has side effect of setting/unsetting `segDragListener`
        buildSegDragListener: function(seg) {
                var _this = this;
                var view = this.view;
                var calendar = view.calendar;
                var eventManager = calendar.eventManager;
                var el = seg.el;
                var eventDef = seg.footprint.eventDef;
                var eventInstance = seg.footprint.eventInstance; // null for inverse-background events
                var isDragging;
                var mouseFollower; // A clone of the original element that will move with the mouse
                var eventDefMutation;

                if (this.segDragListener) {
                        return this.segDragListener;
                }

                // Tracks mouse movement over the *view's* coordinate map. Allows dragging and dropping between subcomponents
                // of the view.
                var dragListener = this.segDragListener = new HitDragListener(view, {
                        scroll: this.opt('dragScroll'),
                        subjectEl: el,
                        subjectCenter: true,
                        interactionStart: function(ev) {
                                seg.component = _this; // for renderDrag
                                isDragging = false;
                                mouseFollower = new MouseFollower(seg.el, {
                                        additionalClass: 'fc-dragging',
                                        parentEl: view.el,
                                        opacity: dragListener.isTouch ? null : _this.opt('dragOpacity'),
                                        revertDuration: _this.opt('dragRevertDuration'),
                                        zIndex: 2 // one above the .fc-view
                                });
                                mouseFollower.hide(); // don't show until we know this is a real drag
                                mouseFollower.start(ev);
                        },
                        dragStart: function(ev) {
                                if (
                                        dragListener.isTouch &&
                                        !view.isEventDefSelected(eventDef) &&
                                        eventInstance
                                ) {
                                        // if not previously selected, will fire after a delay. then, select the event
                                        view.selectEventInstance(eventInstance);
                                }
                                isDragging = true;
                                _this.handleSegMouseout(seg, ev); // ensure a mouseout on the manipulated event has been reported
                                _this.segDragStart(seg, ev);
                                view.hideEventsWithId(eventDef.id); // hide all event segments. our mouseFollower will take over
                        },
                        hitOver: function(hit, isOrig, origHit) {
                                var isAllowed = true;
                                var origFootprint;
                                var footprint;
                                var mutatedEventInstanceGroup;
                                var dragHelperEls;

                                // starting hit could be forced (DayGrid.limit)
                                if (seg.hit) {
                                        origHit = seg.hit;
                                }

                                // hit might not belong to this grid, so query origin grid
                                origFootprint = origHit.component.getSafeHitFootprint(origHit);
                                footprint = hit.component.getSafeHitFootprint(hit);

                                if (origFootprint && footprint) {
                                        eventDefMutation = _this.computeEventDropMutation(origFootprint, footprint, eventDef);

                                        if (eventDefMutation) {
                                                mutatedEventInstanceGroup = eventManager.buildMutatedEventInstanceGroup(
                                                        eventDef.id,
                                                        eventDefMutation
                                                );
                                                isAllowed = _this.isEventInstanceGroupAllowed(mutatedEventInstanceGroup);
                                        }
                                        else {
                                                isAllowed = false;
                                        }
                                }
                                else {
                                        isAllowed = false;
                                }

                                if (!isAllowed) {
                                        eventDefMutation = null;
                                        disableCursor();
                                }

                                // if a valid drop location, have the subclass render a visual indication
                                if (
                                        eventDefMutation &&
                                        (dragHelperEls = view.renderDrag(
                                                _this.eventRangesToEventFootprints(
                                                        mutatedEventInstanceGroup.sliceRenderRanges(_this.unzonedRange, calendar)
                                                ),
                                                seg
                                        ))
                                ) {
                                        dragHelperEls.addClass('fc-dragging');
                                        if (!dragListener.isTouch) {
                                                _this.applyDragOpacity(dragHelperEls);
                                        }

                                        mouseFollower.hide(); // if the subclass is already using a mock event "helper", hide our own
                                }
                                else {
                                        mouseFollower.show(); // otherwise, have the helper follow the mouse (no snapping)
                                }

                                if (isOrig) {
                                        // needs to have moved hits to be a valid drop
                                        eventDefMutation = null;
                                }
                        },
                        hitOut: function() { // called before mouse moves to a different hit OR moved out of all hits
                                view.unrenderDrag(); // unrender whatever was done in renderDrag
                                mouseFollower.show(); // show in case we are moving out of all hits
                                eventDefMutation = null;
                        },
                        hitDone: function() { // Called after a hitOut OR before a dragEnd
                                enableCursor();
                        },
                        interactionEnd: function(ev) {
                                delete seg.component; // prevent side effects

                                // do revert animation if hasn't changed. calls a callback when finished (whether animation or not)
                                mouseFollower.stop(!eventDefMutation, function() {
                                        if (isDragging) {
                                                view.unrenderDrag();
                                                _this.segDragStop(seg, ev);
                                        }

                                        if (eventDefMutation) {
                                                // no need to re-show original, will rerender all anyways. esp important if eventRenderWait
                                                view.reportEventDrop(eventInstance, eventDefMutation, el, ev);
                                        }
                                        else {
                                                view.showEventsWithId(eventDef.id);
                                        }
                                });
                                _this.segDragListener = null;
                        }
                });

                return dragListener;
        },


        // Called before event segment dragging starts
        segDragStart: function(seg, ev) {
                this.isDraggingSeg = true;
                this.publiclyTrigger('eventDragStart', {
                        context: seg.el[0],
                        args: [
                                seg.footprint.getEventLegacy(),
                                ev,
                                {}, // jqui dummy
                                this.view
                        ]
                });
        },


        // Called after event segment dragging stops
        segDragStop: function(seg, ev) {
                this.isDraggingSeg = false;
                this.publiclyTrigger('eventDragStop', {
                        context: seg.el[0],
                        args: [
                                seg.footprint.getEventLegacy(),
                                ev,
                                {}, // jqui dummy
                                this.view
                        ]
                });
        },


        // DOES NOT consider overlap/constraint
        computeEventDropMutation: function(startFootprint, endFootprint, eventDef) {
                var date0 = startFootprint.unzonedRange.getStart();
                var date1 = endFootprint.unzonedRange.getStart();
                var clearEnd = false;
                var forceTimed = false;
                var forceAllDay = false;
                var dateDelta;
                var dateMutation;
                var eventDefMutation;

                if (startFootprint.isAllDay !== endFootprint.isAllDay) {
                        clearEnd = true;

                        if (endFootprint.isAllDay) {
                                forceAllDay = true;
                                date0.stripTime();
                        }
                        else {
                                forceTimed = true;
                        }
                }

                dateDelta = this.diffDates(date1, date0);

                dateMutation = new EventDefDateMutation();
                dateMutation.clearEnd = clearEnd;
                dateMutation.forceTimed = forceTimed;
                dateMutation.forceAllDay = forceAllDay;
                dateMutation.setDateDelta(dateDelta);

                eventDefMutation = new EventDefMutation();
                eventDefMutation.setDateMutation(dateMutation);

                return eventDefMutation;
        },


        // Utility for apply dragOpacity to a jQuery set
        applyDragOpacity: function(els) {
                var opacity = this.opt('dragOpacity');

                if (opacity != null) {
                        els.css('opacity', opacity);
                }
        }

});

;;

/*
Wired up via Grid.event-interation.js by calling
startSegResize
*/
Grid.mixin({

        isResizingSeg: false, // is a segment being resized? boolean


        // returns boolean whether resizing actually started or not.
        // assumes the seg allows resizing.
        // `dragOptions` are optional.
        startSegResize: function(seg, ev, dragOptions) {
                if ($(ev.target).is('.fc-resizer')) {
                        this.buildSegResizeListener(seg, $(ev.target).is('.fc-start-resizer'))
                                .startInteraction(ev, dragOptions);
                        return true;
                }
                return false;
        },


        // Creates a listener that tracks the user as they resize an event segment.
        // Generic enough to work with any type of Grid.
        buildSegResizeListener: function(seg, isStart) {
                var _this = this;
                var view = this.view;
                var calendar = view.calendar;
                var eventManager = calendar.eventManager;
                var el = seg.el;
                var eventDef = seg.footprint.eventDef;
                var eventInstance = seg.footprint.eventInstance;
                var isDragging;
                var resizeMutation; // zoned event date properties. falsy if invalid resize

                // Tracks mouse movement over the *grid's* coordinate map
                var dragListener = this.segResizeListener = new HitDragListener(this, {
                        scroll: this.opt('dragScroll'),
                        subjectEl: el,
                        interactionStart: function() {
                                isDragging = false;
                        },
                        dragStart: function(ev) {
                                isDragging = true;
                                _this.handleSegMouseout(seg, ev); // ensure a mouseout on the manipulated event has been reported
                                _this.segResizeStart(seg, ev);
                        },
                        hitOver: function(hit, isOrig, origHit) {
                                var isAllowed = true;
                                var origHitFootprint = _this.getSafeHitFootprint(origHit);
                                var hitFootprint = _this.getSafeHitFootprint(hit);
                                var mutatedEventInstanceGroup;

                                if (origHitFootprint && hitFootprint) {
                                        resizeMutation = isStart ?
                                                _this.computeEventStartResizeMutation(origHitFootprint, hitFootprint, seg.footprint) :
                                                _this.computeEventEndResizeMutation(origHitFootprint, hitFootprint, seg.footprint);

                                        if (resizeMutation) {
                                                mutatedEventInstanceGroup = eventManager.buildMutatedEventInstanceGroup(
                                                        eventDef.id,
                                                        resizeMutation
                                                );
                                                isAllowed = _this.isEventInstanceGroupAllowed(mutatedEventInstanceGroup);
                                        }
                                        else {
                                                isAllowed = false;
                                        }
                                }
                                else {
                                        isAllowed = false;
                                }

                                if (!isAllowed) {
                                        resizeMutation = null;
                                        disableCursor();
                                }
                                else if (resizeMutation.isEmpty()) {
                                        // no change. (FYI, event dates might have zones)
                                        resizeMutation = null;
                                }

                                if (resizeMutation) {
                                        view.hideEventsWithId(eventDef.id);

                                        _this.renderEventResize(
                                                _this.eventRangesToEventFootprints(
                                                        mutatedEventInstanceGroup.sliceRenderRanges(_this.unzonedRange, calendar)
                                                ),
                                                seg
                                        );
                                }
                        },
                        hitOut: function() { // called before mouse moves to a different hit OR moved out of all hits
                                resizeMutation = null;
                                view.showEventsWithId(eventDef.id); // for when out-of-bounds. show original
                        },
                        hitDone: function() { // resets the rendering to show the original event
                                _this.unrenderEventResize();
                                enableCursor();
                        },
                        interactionEnd: function(ev) {
                                if (isDragging) {
                                        _this.segResizeStop(seg, ev);
                                }

                                if (resizeMutation) { // valid date to resize to?
                                        // no need to re-show original, will rerender all anyways. esp important if eventRenderWait
                                        view.reportEventResize(eventInstance, resizeMutation, el, ev);
                                }
                                else {
                                        view.showEventsWithId(eventDef.id);
                                }
                                _this.segResizeListener = null;
                        }
                });

                return dragListener;
        },


        // Called before event segment resizing starts
        segResizeStart: function(seg, ev) {
                this.isResizingSeg = true;
                this.publiclyTrigger('eventResizeStart', {
                        context: seg.el[0],
                        args: [
                                seg.footprint.getEventLegacy(),
                                ev,
                                {}, // jqui dummy
                                this.view
                        ]
                });
        },


        // Called after event segment resizing stops
        segResizeStop: function(seg, ev) {
                this.isResizingSeg = false;
                this.publiclyTrigger('eventResizeStop', {
                        context: seg.el[0],
                        args: [
                                seg.footprint.getEventLegacy(),
                                ev,
                                {}, // jqui dummy
                                this.view
                        ]
                });
        },


        // Returns new date-information for an event segment being resized from its start
        computeEventStartResizeMutation: function(startFootprint, endFootprint, origEventFootprint) {
                var origRange = origEventFootprint.componentFootprint.unzonedRange;
                var startDelta = this.diffDates(
                        endFootprint.unzonedRange.getStart(),
                        startFootprint.unzonedRange.getStart()
                );
                var dateMutation;
                var eventDefMutation;

                if (origRange.getStart().add(startDelta) < origRange.getEnd()) {

                        dateMutation = new EventDefDateMutation();
                        dateMutation.setStartDelta(startDelta);

                        eventDefMutation = new EventDefMutation();
                        eventDefMutation.setDateMutation(dateMutation);

                        return eventDefMutation;
                }

                return false;
        },


        // Returns new date-information for an event segment being resized from its end
        computeEventEndResizeMutation: function(startFootprint, endFootprint, origEventFootprint) {
                var origRange = origEventFootprint.componentFootprint.unzonedRange;
                var endDelta = this.diffDates(
                        endFootprint.unzonedRange.getEnd(),
                        startFootprint.unzonedRange.getEnd()
                );
                var dateMutation;
                var eventDefMutation;

                if (origRange.getEnd().add(endDelta) > origRange.getStart()) {

                        dateMutation = new EventDefDateMutation();
                        dateMutation.setEndDelta(endDelta);

                        eventDefMutation = new EventDefMutation();
                        eventDefMutation.setDateMutation(dateMutation);

                        return eventDefMutation;
                }

                return false;
        },


        // Renders a visual indication of an event being resized.
        // Must return elements used for any mock events.
        renderEventResize: function(eventFootprints, seg) {
                // subclasses must implement
        },


        // Unrenders a visual indication of an event being resized.
        unrenderEventResize: function() {
                // subclasses must implement
        }

});

;;

/*
Wired up via Grid.js by calling
externalDragStart
*/
Grid.mixin({

        isDraggingExternal: false, // jqui-dragging an external element? boolean


        // Called when a jQuery UI drag is initiated anywhere in the DOM
        externalDragStart: function(ev, ui) {
                var el;
                var accept;

                if (this.opt('droppable')) { // only listen if this setting is on
                        el = $((ui ? ui.item : null) || ev.target);

                        // Test that the dragged element passes the dropAccept selector or filter function.
                        // FYI, the default is "*" (matches all)
                        accept = this.opt('dropAccept');
                        if ($.isFunction(accept) ? accept.call(el[0], el) : el.is(accept)) {
                                if (!this.isDraggingExternal) { // prevent double-listening if fired twice
                                        this.listenToExternalDrag(el, ev, ui);
                                }
                        }
                }
        },


        // Called when a jQuery UI drag starts and it needs to be monitored for dropping
        listenToExternalDrag: function(el, ev, ui) {
                var _this = this;
                var view = this.view;
                var meta = getDraggedElMeta(el); // extra data about event drop, including possible event to create
                var singleEventDef; // a null value signals an unsuccessful drag

                // listener that tracks mouse movement over date-associated pixel regions
                var dragListener = _this.externalDragListener = new HitDragListener(this, {
                        interactionStart: function() {
                                _this.isDraggingExternal = true;
                        },
                        hitOver: function(hit) {
                                var isAllowed = true;
                                var hitFootprint = hit.component.getSafeHitFootprint(hit); // hit might not belong to this grid
                                var mutatedEventInstanceGroup;

                                if (hitFootprint) {
                                        singleEventDef = _this.computeExternalDrop(hitFootprint, meta);

                                        if (singleEventDef) {
                                                mutatedEventInstanceGroup = new EventInstanceGroup(
                                                        singleEventDef.buildInstances()
                                                );
                                                isAllowed = meta.eventProps ? // isEvent?
                                                        _this.isEventInstanceGroupAllowed(mutatedEventInstanceGroup) :
                                                        _this.isExternalInstanceGroupAllowed(mutatedEventInstanceGroup);
                                        }
                                        else {
                                                isAllowed = false;
                                        }
                                }
                                else {
                                        isAllowed = false;
                                }

                                if (!isAllowed) {
                                        singleEventDef = null;
                                        disableCursor();
                                }

                                if (singleEventDef) {
                                        _this.renderDrag( // called without a seg parameter
                                                _this.eventRangesToEventFootprints(
                                                        mutatedEventInstanceGroup.sliceRenderRanges(_this.unzonedRange, view.calendar)
                                                )
                                        );
                                }
                        },
                        hitOut: function() {
                                singleEventDef = null; // signal unsuccessful
                        },
                        hitDone: function() { // Called after a hitOut OR before a dragEnd
                                enableCursor();
                                _this.unrenderDrag();
                        },
                        interactionEnd: function(ev) {

                                if (singleEventDef) { // element was dropped on a valid hit
                                        view.reportExternalDrop(
                                                singleEventDef,
                                                Boolean(meta.eventProps), // isEvent
                                                Boolean(meta.stick), // isSticky
                                                el, ev, ui
                                        );
                                }

                                _this.isDraggingExternal = false;
                                _this.externalDragListener = null;
                        }
                });

                dragListener.startDrag(ev); // start listening immediately
        },


        // Given a hit to be dropped upon, and misc data associated with the jqui drag (guaranteed to be a plain object),
        // returns the zoned start/end dates for the event that would result from the hypothetical drop. end might be null.
        // Returning a null value signals an invalid drop hit.
        // DOES NOT consider overlap/constraint.
        // Assumes both footprints are non-open-ended.
        computeExternalDrop: function(componentFootprint, meta) {
                var calendar = this.view.calendar;
                var start = FC.moment.utc(componentFootprint.unzonedRange.startMs).stripZone();
                var end;
                var eventDef;

                if (componentFootprint.isAllDay) {
                        // if dropped on an all-day span, and element's metadata specified a time, set it
                        if (meta.startTime) {
                                start.time(meta.startTime);
                        }
                        else {
                                start.stripTime();
                        }
                }

                if (meta.duration) {
                        end = start.clone().add(meta.duration);
                }

                start = calendar.applyTimezone(start);

                if (end) {
                        end = calendar.applyTimezone(end);
                }

                eventDef = SingleEventDef.parse(
                        $.extend({}, meta.eventProps, {
                                start: start,
                                end: end
                        }),
                        new EventSource(calendar)
                );

                return eventDef;
        },


        // NOTE: very similar to isEventInstanceGroupAllowed
        // when it's a completely anonymous external drag, no event.
        isExternalInstanceGroupAllowed: function(eventInstanceGroup) {
                var calendar = this.view.calendar;
                var eventFootprints = this.eventRangesToEventFootprints(eventInstanceGroup.getAllEventRanges());
                var i;

                for (i = 0; i < eventFootprints.length; i++) {
                        if (!this.view.validUnzonedRange.containsRange(eventFootprints[i].componentFootprint.unzonedRange)) {
                                return false;
                        }
                }

                for (i = 0; i < eventFootprints.length; i++) {
                        // treat it as a selection
                        // TODO: pass in eventInstanceGroup instead
                        //  because we don't want calendar's constraint system to depend on a component's
                        //  determination of footprints.
                        if (!calendar.isSelectionFootprintAllowed(eventFootprints[i].componentFootprint)) {
                                return false;
                        }
                }

                return true;
        }

});


/* External-Dragging-Element Data
----------------------------------------------------------------------------------------------------------------------*/

// Require all HTML5 data-* attributes used by FullCalendar to have this prefix.
// A value of '' will query attributes like data-event. A value of 'fc' will query attributes like data-fc-event.
FC.dataAttrPrefix = '';

// Given a jQuery element that might represent a dragged FullCalendar event, returns an intermediate data structure
// to be used for Event Object creation.
// A defined `.eventProps`, even when empty, indicates that an event should be created.
function getDraggedElMeta(el) {
        var prefix = FC.dataAttrPrefix;
        var eventProps; // properties for creating the event, not related to date/time
        var startTime; // a Duration
        var duration;
        var stick;

        if (prefix) { prefix += '-'; }
        eventProps = el.data(prefix + 'event') || null;

        if (eventProps) {
                if (typeof eventProps === 'object') {
                        eventProps = $.extend({}, eventProps); // make a copy
                }
                else { // something like 1 or true. still signal event creation
                        eventProps = {};
                }

                // pluck special-cased date/time properties
                startTime = eventProps.start;
                if (startTime == null) { startTime = eventProps.time; } // accept 'time' as well
                duration = eventProps.duration;
                stick = eventProps.stick;
                delete eventProps.start;
                delete eventProps.time;
                delete eventProps.duration;
                delete eventProps.stick;
        }

        // fallback to standalone attribute values for each of the date/time properties
        if (startTime == null) { startTime = el.data(prefix + 'start'); }
        if (startTime == null) { startTime = el.data(prefix + 'time'); } // accept 'time' as well
        if (duration == null) { duration = el.data(prefix + 'duration'); }
        if (stick == null) { stick = el.data(prefix + 'stick'); }

        // massage into correct data types
        startTime = startTime != null ? moment.duration(startTime) : null;
        duration = duration != null ? moment.duration(duration) : null;
        stick = Boolean(stick);

        return { eventProps: eventProps, startTime: startTime, duration: duration, stick: stick };
}

;;

Grid.mixin({

        /* Fill System (highlight, background events, business hours)
        --------------------------------------------------------------------------------------------------------------------
        TODO: remove this system. like we did in TimeGrid
        */


        elsByFill: null, // a hash of jQuery element sets used for rendering each fill. Keyed by fill name.


        initFillInternals: function() {
                this.elsByFill = {};
        },


        // Renders a set of rectangles over the given segments of time.
        // MUST RETURN a subset of segs, the segs that were actually rendered.
        // Responsible for populating this.elsByFill. TODO: better API for expressing this requirement
        renderFill: function(type, segs) {
                // subclasses must implement
        },


        // Unrenders a specific type of fill that is currently rendered on the grid
        unrenderFill: function(type) {
                var el = this.elsByFill[type];

                if (el) {
                        el.remove();
                        delete this.elsByFill[type];
                }
        },


        // Renders and assigns an `el` property for each fill segment. Generic enough to work with different types.
        // Only returns segments that successfully rendered.
        // To be harnessed by renderFill (implemented by subclasses).
        // Analagous to renderFgSegEls.
        renderFillSegEls: function(type, segs) {
                var _this = this;
                var segElMethod = this[type + 'SegEl'];
                var html = '';
                var renderedSegs = [];
                var i;

                if (segs.length) {

                        // build a large concatenation of segment HTML
                        for (i = 0; i < segs.length; i++) {
                                html += this.fillSegHtml(type, segs[i]);
                        }

                        // Grab individual elements from the combined HTML string. Use each as the default rendering.
                        // Then, compute the 'el' for each segment.
                        $(html).each(function(i, node) {
                                var seg = segs[i];
                                var el = $(node);

                                // allow custom filter methods per-type
                                if (segElMethod) {
                                        el = segElMethod.call(_this, seg, el);
                                }

                                if (el) { // custom filters did not cancel the render
                                        el = $(el); // allow custom filter to return raw DOM node

                                        // correct element type? (would be bad if a non-TD were inserted into a table for example)
                                        if (el.is(_this.fillSegTag)) {
                                                seg.el = el;
                                                renderedSegs.push(seg);
                                        }
                                }
                        });
                }

                return renderedSegs;
        },


        fillSegTag: 'div', // subclasses can override


        // Builds the HTML needed for one fill segment. Generic enough to work with different types.
        fillSegHtml: function(type, seg) {

                // custom hooks per-type
                var classesMethod = this[type + 'SegClasses'];
                var cssMethod = this[type + 'SegCss'];

                var classes = classesMethod ? classesMethod.call(this, seg) : [];
                var css = cssToStr(cssMethod ? cssMethod.call(this, seg) : {});

                return '<' + this.fillSegTag +
                        (classes.length ? ' class="' + classes.join(' ') + '"' : '') +
                        (css ? ' style="' + css + '"' : '') +
                        ' />';
        },


        // Generates an array of classNames for rendering the highlight. Used by the fill system.
        highlightSegClasses: function() {
                return [ 'fc-highlight' ];
        }

});

;;

/*
A set of rendering and date-related methods for a visual component comprised of one or more rows of day columns.
Prerequisite: the object being mixed into needs to be a *Grid*
*/
var DayTableMixin = FC.DayTableMixin = {

        breakOnWeeks: false, // should create a new row for each week?
        dayDates: null, // whole-day dates for each column. left to right
        dayIndices: null, // for each day from start, the offset
        daysPerRow: null,
        rowCnt: null,
        colCnt: null,
        colHeadFormat: null,


        // Populates internal variables used for date calculation and rendering
        updateDayTable: function() {
                var view = this.view;
                var calendar = view.calendar;
                var date = calendar.msToUtcMoment(this.unzonedRange.startMs, true);
                var end = calendar.msToUtcMoment(this.unzonedRange.endMs, true);
                var dayIndex = -1;
                var dayIndices = [];
                var dayDates = [];
                var daysPerRow;
                var firstDay;
                var rowCnt;

                while (date.isBefore(end)) { // loop each day from start to end
                        if (view.isHiddenDay(date)) {
                                dayIndices.push(dayIndex + 0.5); // mark that it's between indices
                        }
                        else {
                                dayIndex++;
                                dayIndices.push(dayIndex);
                                dayDates.push(date.clone());
                        }
                        date.add(1, 'days');
                }

                if (this.breakOnWeeks) {
                        // count columns until the day-of-week repeats
                        firstDay = dayDates[0].day();
                        for (daysPerRow = 1; daysPerRow < dayDates.length; daysPerRow++) {
                                if (dayDates[daysPerRow].day() == firstDay) {
                                        break;
                                }
                        }
                        rowCnt = Math.ceil(dayDates.length / daysPerRow);
                }
                else {
                        rowCnt = 1;
                        daysPerRow = dayDates.length;
                }

                this.dayDates = dayDates;
                this.dayIndices = dayIndices;
                this.daysPerRow = daysPerRow;
                this.rowCnt = rowCnt;

                this.updateDayTableCols();
        },


        // Computes and assigned the colCnt property and updates any options that may be computed from it
        updateDayTableCols: function() {
                this.colCnt = this.computeColCnt();
                this.colHeadFormat = this.opt('columnFormat') || this.computeColHeadFormat();
        },


        // Determines how many columns there should be in the table
        computeColCnt: function() {
                return this.daysPerRow;
        },


        // Computes the ambiguously-timed moment for the given cell
        getCellDate: function(row, col) {
                return this.dayDates[
                                this.getCellDayIndex(row, col)
                        ].clone();
        },


        // Computes the ambiguously-timed date range for the given cell
        getCellRange: function(row, col) {
                var start = this.getCellDate(row, col);
                var end = start.clone().add(1, 'days');

                return { start: start, end: end };
        },


        // Returns the number of day cells, chronologically, from the first of the grid (0-based)
        getCellDayIndex: function(row, col) {
                return row * this.daysPerRow + this.getColDayIndex(col);
        },


        // Returns the numner of day cells, chronologically, from the first cell in *any given row*
        getColDayIndex: function(col) {
                if (this.isRTL) {
                        return this.colCnt - 1 - col;
                }
                else {
                        return col;
                }
        },


        // Given a date, returns its chronolocial cell-index from the first cell of the grid.
        // If the date lies between cells (because of hiddenDays), returns a floating-point value between offsets.
        // If before the first offset, returns a negative number.
        // If after the last offset, returns an offset past the last cell offset.
        // Only works for *start* dates of cells. Will not work for exclusive end dates for cells.
        getDateDayIndex: function(date) {
                var dayIndices = this.dayIndices;
                var dayOffset = date.diff(this.dayDates[0], 'days');

                if (dayOffset < 0) {
                        return dayIndices[0] - 1;
                }
                else if (dayOffset >= dayIndices.length) {
                        return dayIndices[dayIndices.length - 1] + 1;
                }
                else {
                        return dayIndices[dayOffset];
                }
        },


        /* Options
        ------------------------------------------------------------------------------------------------------------------*/


        // Computes a default column header formatting string if `colFormat` is not explicitly defined
        computeColHeadFormat: function() {
                // if more than one week row, or if there are a lot of columns with not much space,
                // put just the day numbers will be in each cell
                if (this.rowCnt > 1 || this.colCnt > 10) {
                        return 'ddd'; // "Sat"
                }
                // multiple days, so full single date string WON'T be in title text
                else if (this.colCnt > 1) {
                        return this.opt('dayOfMonthFormat'); // "Sat 12/10"
                }
                // single day, so full single date string will probably be in title text
                else {
                        return 'dddd'; // "Saturday"
                }
        },


        /* Slicing
        ------------------------------------------------------------------------------------------------------------------*/


        // Slices up a date range into a segment for every week-row it intersects with
        sliceRangeByRow: function(unzonedRange) {
                var daysPerRow = this.daysPerRow;
                var normalRange = this.view.computeDayRange(unzonedRange); // make whole-day range, considering nextDayThreshold
                var rangeFirst = this.getDateDayIndex(normalRange.start); // inclusive first index
                var rangeLast = this.getDateDayIndex(normalRange.end.clone().subtract(1, 'days')); // inclusive last index
                var segs = [];
                var row;
                var rowFirst, rowLast; // inclusive day-index range for current row
                var segFirst, segLast; // inclusive day-index range for segment

                for (row = 0; row < this.rowCnt; row++) {
                        rowFirst = row * daysPerRow;
                        rowLast = rowFirst + daysPerRow - 1;

                        // intersect segment's offset range with the row's
                        segFirst = Math.max(rangeFirst, rowFirst);
                        segLast = Math.min(rangeLast, rowLast);

                        // deal with in-between indices
                        segFirst = Math.ceil(segFirst); // in-between starts round to next cell
                        segLast = Math.floor(segLast); // in-between ends round to prev cell

                        if (segFirst <= segLast) { // was there any intersection with the current row?
                                segs.push({
                                        row: row,

                                        // normalize to start of row
                                        firstRowDayIndex: segFirst - rowFirst,
                                        lastRowDayIndex: segLast - rowFirst,

                                        // must be matching integers to be the segment's start/end
                                        isStart: segFirst === rangeFirst,
                                        isEnd: segLast === rangeLast
                                });
                        }
                }

                return segs;
        },


        // Slices up a date range into a segment for every day-cell it intersects with.
        // TODO: make more DRY with sliceRangeByRow somehow.
        sliceRangeByDay: function(unzonedRange) {
                var daysPerRow = this.daysPerRow;
                var normalRange = this.view.computeDayRange(unzonedRange); // make whole-day range, considering nextDayThreshold
                var rangeFirst = this.getDateDayIndex(normalRange.start); // inclusive first index
                var rangeLast = this.getDateDayIndex(normalRange.end.clone().subtract(1, 'days')); // inclusive last index
                var segs = [];
                var row;
                var rowFirst, rowLast; // inclusive day-index range for current row
                var i;
                var segFirst, segLast; // inclusive day-index range for segment

                for (row = 0; row < this.rowCnt; row++) {
                        rowFirst = row * daysPerRow;
                        rowLast = rowFirst + daysPerRow - 1;

                        for (i = rowFirst; i <= rowLast; i++) {

                                // intersect segment's offset range with the row's
                                segFirst = Math.max(rangeFirst, i);
                                segLast = Math.min(rangeLast, i);

                                // deal with in-between indices
                                segFirst = Math.ceil(segFirst); // in-between starts round to next cell
                                segLast = Math.floor(segLast); // in-between ends round to prev cell

                                if (segFirst <= segLast) { // was there any intersection with the current row?
                                        segs.push({
                                                row: row,

                                                // normalize to start of row
                                                firstRowDayIndex: segFirst - rowFirst,
                                                lastRowDayIndex: segLast - rowFirst,

                                                // must be matching integers to be the segment's start/end
                                                isStart: segFirst === rangeFirst,
                                                isEnd: segLast === rangeLast
                                        });
                                }
                        }
                }

                return segs;
        },


        /* Header Rendering
        ------------------------------------------------------------------------------------------------------------------*/


        renderHeadHtml: function() {
                var theme = this.view.calendar.theme;

                return '' +
                        '<div class="fc-row ' + theme.getClass('headerRow') + '">' +
                                '<table class="' + theme.getClass('tableGrid') + '">' +
                                        '<thead>' +
                                                this.renderHeadTrHtml() +
                                        '</thead>' +
                                '</table>' +
                        '</div>';
        },


        renderHeadIntroHtml: function() {
                return this.renderIntroHtml(); // fall back to generic
        },


        renderHeadTrHtml: function() {
                return '' +
                        '<tr>' +
                                (this.isRTL ? '' : this.renderHeadIntroHtml()) +
                                this.renderHeadDateCellsHtml() +
                                (this.isRTL ? this.renderHeadIntroHtml() : '') +
                        '</tr>';
        },


        renderHeadDateCellsHtml: function() {
                var htmls = [];
                var col, date;

                for (col = 0; col < this.colCnt; col++) {
                        date = this.getCellDate(0, col);
                        htmls.push(this.renderHeadDateCellHtml(date));
                }

                return htmls.join('');
        },


        // TODO: when internalApiVersion, accept an object for HTML attributes
        // (colspan should be no different)
        renderHeadDateCellHtml: function(date, colspan, otherAttrs) {
                var view = this.view;
                var isDateValid = view.activeUnzonedRange.containsDate(date); // TODO: called too frequently. cache somehow.
                var classNames = [
                        'fc-day-header',
                        view.calendar.theme.getClass('widgetHeader')
                ];
                var innerHtml = htmlEscape(date.format(this.colHeadFormat));

                // if only one row of days, the classNames on the header can represent the specific days beneath
                if (this.rowCnt === 1) {
                        classNames = classNames.concat(
                                // includes the day-of-week class
                                // noThemeHighlight=true (don't highlight the header)
                                this.getDayClasses(date, true)
                        );
                }
                else {
                        classNames.push('fc-' + dayIDs[date.day()]); // only add the day-of-week class
                }

                return '' +
            '<th class="' + classNames.join(' ') + '"' +
                                ((isDateValid && this.rowCnt) === 1 ?
                                        ' data-date="' + date.format('YYYY-MM-DD') + '"' :
                                        '') +
                                (colspan > 1 ?
                                        ' colspan="' + colspan + '"' :
                                        '') +
                                (otherAttrs ?
                                        ' ' + otherAttrs :
                                        '') +
                                '>' +
                                (isDateValid ?
                                        // don't make a link if the heading could represent multiple days, or if there's only one day (forceOff)
                                        view.buildGotoAnchorHtml(
                                                { date: date, forceOff: this.rowCnt > 1 || this.colCnt === 1 },
                                                innerHtml
                                        ) :
                                        // if not valid, display text, but no link
                                        innerHtml
                                ) +
                        '</th>';
        },


        /* Background Rendering
        ------------------------------------------------------------------------------------------------------------------*/


        renderBgTrHtml: function(row) {
                return '' +
                        '<tr>' +
                                (this.isRTL ? '' : this.renderBgIntroHtml(row)) +
                                this.renderBgCellsHtml(row) +
                                (this.isRTL ? this.renderBgIntroHtml(row) : '') +
                        '</tr>';
        },


        renderBgIntroHtml: function(row) {
                return this.renderIntroHtml(); // fall back to generic
        },


        renderBgCellsHtml: function(row) {
                var htmls = [];
                var col, date;

                for (col = 0; col < this.colCnt; col++) {
                        date = this.getCellDate(row, col);
                        htmls.push(this.renderBgCellHtml(date));
                }

                return htmls.join('');
        },


        renderBgCellHtml: function(date, otherAttrs) {
                var view = this.view;
                var isDateValid = view.activeUnzonedRange.containsDate(date); // TODO: called too frequently. cache somehow.
                var classes = this.getDayClasses(date);

                classes.unshift('fc-day', view.calendar.theme.getClass('widgetContent'));

                return '<td class="' + classes.join(' ') + '"' +
                        (isDateValid ?
                                ' data-date="' + date.format('YYYY-MM-DD') + '"' : // if date has a time, won't format it
                                '') +
                        (otherAttrs ?
                                ' ' + otherAttrs :
                                '') +
                        '></td>';
        },


        /* Generic
        ------------------------------------------------------------------------------------------------------------------*/


        // Generates the default HTML intro for any row. User classes should override
        renderIntroHtml: function() {
        },


        // TODO: a generic method for dealing with <tr>, RTL, intro
        // when increment internalApiVersion
        // wrapTr (scheduler)


        /* Utils
        ------------------------------------------------------------------------------------------------------------------*/


        // Applies the generic "intro" and "outro" HTML to the given cells.
        // Intro means the leftmost cell when the calendar is LTR and the rightmost cell when RTL. Vice-versa for outro.
        bookendCells: function(trEl) {
                var introHtml = this.renderIntroHtml();

                if (introHtml) {
                        if (this.isRTL) {
                                trEl.append(introHtml);
                        }
                        else {
                                trEl.prepend(introHtml);
                        }
                }
        }

};

;;

/* A component that renders a grid of whole-days that runs horizontally. There can be multiple rows, one per week.
----------------------------------------------------------------------------------------------------------------------*/

var DayGrid = FC.DayGrid = Grid.extend(DayTableMixin, {

        numbersVisible: false, // should render a row for day/week numbers? set by outside view. TODO: make internal
        bottomCoordPadding: 0, // hack for extending the hit area for the last row of the coordinate grid

        rowEls: null, // set of fake row elements
        cellEls: null, // set of whole-day elements comprising the row's background
        helperEls: null, // set of cell skeleton elements for rendering the mock event "helper"

        rowCoordCache: null,
        colCoordCache: null,


        // Renders the rows and columns into the component's `this.el`, which should already be assigned.
        // isRigid determins whether the individual rows should ignore the contents and be a constant height.
        // Relies on the view's colCnt and rowCnt. In the future, this component should probably be self-sufficient.
        renderDates: function(isRigid) {
                var view = this.view;
                var rowCnt = this.rowCnt;
                var colCnt = this.colCnt;
                var html = '';
                var row;
                var col;

                for (row = 0; row < rowCnt; row++) {
                        html += this.renderDayRowHtml(row, isRigid);
                }
                this.el.html(html);

                this.rowEls = this.el.find('.fc-row');
                this.cellEls = this.el.find('.fc-day, .fc-disabled-day');

                this.rowCoordCache = new CoordCache({
                        els: this.rowEls,
                        isVertical: true
                });
                this.colCoordCache = new CoordCache({
                        els: this.cellEls.slice(0, this.colCnt), // only the first row
                        isHorizontal: true
                });

                // trigger dayRender with each cell's element
                for (row = 0; row < rowCnt; row++) {
                        for (col = 0; col < colCnt; col++) {
                                this.publiclyTrigger('dayRender', {
                                        context: view,
                                        args: [
                                                this.getCellDate(row, col),
                                                this.getCellEl(row, col),
                                                view
                                        ]
                                });
                        }
                }
        },


        unrenderDates: function() {
                this.removeSegPopover();
        },


        renderBusinessHours: function() {
                var segs = this.buildBusinessHourSegs(true); // wholeDay=true
                this.renderFill('businessHours', segs, 'bgevent');
        },


        unrenderBusinessHours: function() {
                this.unrenderFill('businessHours');
        },


        // Generates the HTML for a single row, which is a div that wraps a table.
        // `row` is the row number.
        renderDayRowHtml: function(row, isRigid) {
                var theme = this.view.calendar.theme;
                var classes = [ 'fc-row', 'fc-week', theme.getClass('dayRow') ];

                if (isRigid) {
                        classes.push('fc-rigid');
                }

                return '' +
                        '<div class="' + classes.join(' ') + '">' +
                                '<div class="fc-bg">' +
                                        '<table class="' + theme.getClass('tableGrid') + '">' +
                                                this.renderBgTrHtml(row) +
                                        '</table>' +
                                '</div>' +
                                '<div class="fc-content-skeleton">' +
                                        '<table>' +
                                                (this.numbersVisible ?
                                                        '<thead>' +
                                                                this.renderNumberTrHtml(row) +
                                                        '</thead>' :
                                                        ''
                                                        ) +
                                        '</table>' +
                                '</div>' +
                        '</div>';
        },


        /* Grid Number Rendering
        ------------------------------------------------------------------------------------------------------------------*/


        renderNumberTrHtml: function(row) {
                return '' +
                        '<tr>' +
                                (this.isRTL ? '' : this.renderNumberIntroHtml(row)) +
                                this.renderNumberCellsHtml(row) +
                                (this.isRTL ? this.renderNumberIntroHtml(row) : '') +
                        '</tr>';
        },


        renderNumberIntroHtml: function(row) {
                return this.renderIntroHtml();
        },


        renderNumberCellsHtml: function(row) {
                var htmls = [];
                var col, date;

                for (col = 0; col < this.colCnt; col++) {
                        date = this.getCellDate(row, col);
                        htmls.push(this.renderNumberCellHtml(date));
                }

                return htmls.join('');
        },


        // Generates the HTML for the <td>s of the "number" row in the DayGrid's content skeleton.
        // The number row will only exist if either day numbers or week numbers are turned on.
        renderNumberCellHtml: function(date) {
                var view = this.view;
                var html = '';
                var isDateValid = view.activeUnzonedRange.containsDate(date); // TODO: called too frequently. cache somehow.
                var isDayNumberVisible = view.dayNumbersVisible && isDateValid;
                var classes;
                var weekCalcFirstDoW;

                if (!isDayNumberVisible && !view.cellWeekNumbersVisible) {
                        // no numbers in day cell (week number must be along the side)
                        return '<td/>'; //  will create an empty space above events :(
                }

                classes = this.getDayClasses(date);
                classes.unshift('fc-day-top');

                if (view.cellWeekNumbersVisible) {
                        // To determine the day of week number change under ISO, we cannot
                        // rely on moment.js methods such as firstDayOfWeek() or weekday(),
                        // because they rely on the locale's dow (possibly overridden by
                        // our firstDay option), which may not be Monday. We cannot change
                        // dow, because that would affect the calendar start day as well.
                        if (date._locale._fullCalendar_weekCalc === 'ISO') {
                                weekCalcFirstDoW = 1;  // Monday by ISO 8601 definition
                        }
                        else {
                                weekCalcFirstDoW = date._locale.firstDayOfWeek();
                        }
                }

                html += '<td class="' + classes.join(' ') + '"' +
                        (isDateValid ?
                                ' data-date="' + date.format() + '"' :
                                ''
                                ) +
                        '>';

                if (view.cellWeekNumbersVisible && (date.day() == weekCalcFirstDoW)) {
                        html += view.buildGotoAnchorHtml(
                                { date: date, type: 'week' },
                                { 'class': 'fc-week-number' },
                                date.format('w') // inner HTML
                        );
                }

                if (isDayNumberVisible) {
                        html += view.buildGotoAnchorHtml(
                                date,
                                { 'class': 'fc-day-number' },
                                date.date() // inner HTML
                        );
                }

                html += '</td>';

                return html;
        },


        /* Options
        ------------------------------------------------------------------------------------------------------------------*/


        // Computes a default event time formatting string if `timeFormat` is not explicitly defined
        computeEventTimeFormat: function() {
                return this.opt('extraSmallTimeFormat'); // like "6p" or "6:30p"
        },


        // Computes a default `displayEventEnd` value if one is not expliclty defined
        computeDisplayEventEnd: function() {
                return this.colCnt == 1; // we'll likely have space if there's only one day
        },


        /* Dates
        ------------------------------------------------------------------------------------------------------------------*/


        rangeUpdated: function() {
                this.updateDayTable();
        },


        // Slices up the given span (unzoned start/end with other misc data) into an array of segments
        componentFootprintToSegs: function(componentFootprint) {
                var segs = this.sliceRangeByRow(componentFootprint.unzonedRange);
                var i, seg;

                for (i = 0; i < segs.length; i++) {
                        seg = segs[i];

                        if (this.isRTL) {
                                seg.leftCol = this.daysPerRow - 1 - seg.lastRowDayIndex;
                                seg.rightCol = this.daysPerRow - 1 - seg.firstRowDayIndex;
                        }
                        else {
                                seg.leftCol = seg.firstRowDayIndex;
                                seg.rightCol = seg.lastRowDayIndex;
                        }
                }

                return segs;
        },


        /* Hit System
        ------------------------------------------------------------------------------------------------------------------*/


        prepareHits: function() {
                this.colCoordCache.build();
                this.rowCoordCache.build();
                this.rowCoordCache.bottoms[this.rowCnt - 1] += this.bottomCoordPadding; // hack
        },


        releaseHits: function() {
                this.colCoordCache.clear();
                this.rowCoordCache.clear();
        },


        queryHit: function(leftOffset, topOffset) {
                if (this.colCoordCache.isLeftInBounds(leftOffset) && this.rowCoordCache.isTopInBounds(topOffset)) {
                        var col = this.colCoordCache.getHorizontalIndex(leftOffset);
                        var row = this.rowCoordCache.getVerticalIndex(topOffset);

                        if (row != null && col != null) {
                                return this.getCellHit(row, col);
                        }
                }
        },


        getHitFootprint: function(hit) {
                var range = this.getCellRange(hit.row, hit.col);

                return new ComponentFootprint(
                        new UnzonedRange(range.start, range.end),
                        true // all-day?
                );
        },


        getHitEl: function(hit) {
                return this.getCellEl(hit.row, hit.col);
        },


        /* Cell System
        ------------------------------------------------------------------------------------------------------------------*/
        // FYI: the first column is the leftmost column, regardless of date


        getCellHit: function(row, col) {
                return {
                        row: row,
                        col: col,
                        component: this, // needed unfortunately :(
                        left: this.colCoordCache.getLeftOffset(col),
                        right: this.colCoordCache.getRightOffset(col),
                        top: this.rowCoordCache.getTopOffset(row),
                        bottom: this.rowCoordCache.getBottomOffset(row)
                };
        },


        getCellEl: function(row, col) {
                return this.cellEls.eq(row * this.colCnt + col);
        },


        /* Event Drag Visualization
        ------------------------------------------------------------------------------------------------------------------*/
        // TODO: move to DayGrid.event, similar to what we did with Grid's drag methods


        // Renders a visual indication of an event or external element being dragged.
        // `eventLocation` has zoned start and end (optional)
        renderDrag: function(eventFootprints, seg) {
                var i;

                for (i = 0; i < eventFootprints.length; i++) {
                        this.renderHighlight(eventFootprints[i].componentFootprint);
                }

                // if a segment from the same calendar but another component is being dragged, render a helper event
                if (seg && seg.component !== this) {
                        return this.renderHelperEventFootprints(eventFootprints, seg); // returns mock event elements
                }
        },


        // Unrenders any visual indication of a hovering event
        unrenderDrag: function() {
                this.unrenderHighlight();
                this.unrenderHelper();
        },


        /* Event Resize Visualization
        ------------------------------------------------------------------------------------------------------------------*/


        // Renders a visual indication of an event being resized
        renderEventResize: function(eventFootprints, seg) {
                var i;

                for (i = 0; i < eventFootprints.length; i++) {
                        this.renderHighlight(eventFootprints[i].componentFootprint);
                }

                return this.renderHelperEventFootprints(eventFootprints, seg); // returns mock event elements
        },


        // Unrenders a visual indication of an event being resized
        unrenderEventResize: function() {
                this.unrenderHighlight();
                this.unrenderHelper();
        },


        /* Event Helper
        ------------------------------------------------------------------------------------------------------------------*/


        // Renders a mock "helper" event. `sourceSeg` is the associated internal segment object. It can be null.
        renderHelperEventFootprintEls: function(eventFootprints, sourceSeg) {
                var helperNodes = [];
                var segs = this.eventFootprintsToSegs(eventFootprints);
                var rowStructs;

                segs = this.renderFgSegEls(segs); // assigns each seg's el and returns a subset of segs that were rendered
                rowStructs = this.renderSegRows(segs);

                // inject each new event skeleton into each associated row
                this.rowEls.each(function(row, rowNode) {
                        var rowEl = $(rowNode); // the .fc-row
                        var skeletonEl = $('<div class="fc-helper-skeleton"><table/></div>'); // will be absolutely positioned
                        var skeletonTop;

                        // If there is an original segment, match the top position. Otherwise, put it at the row's top level
                        if (sourceSeg && sourceSeg.row === row) {
                                skeletonTop = sourceSeg.el.position().top;
                        }
                        else {
                                skeletonTop = rowEl.find('.fc-content-skeleton tbody').position().top;
                        }

                        skeletonEl.css('top', skeletonTop)
                                .find('table')
                                        .append(rowStructs[row].tbodyEl);

                        rowEl.append(skeletonEl);
                        helperNodes.push(skeletonEl[0]);
                });

                return ( // must return the elements rendered
                        this.helperEls = $(helperNodes) // array -> jQuery set
                );
        },


        // Unrenders any visual indication of a mock helper event
        unrenderHelper: function() {
                if (this.helperEls) {
                        this.helperEls.remove();
                        this.helperEls = null;
                }
        },


        /* Fill System (highlight, background events, business hours)
        ------------------------------------------------------------------------------------------------------------------*/


        fillSegTag: 'td', // override the default tag name


        // Renders a set of rectangles over the given segments of days.
        // Only returns segments that successfully rendered.
        renderFill: function(type, segs, className) {
                var nodes = [];
                var i, seg;
                var skeletonEl;

                segs = this.renderFillSegEls(type, segs); // assignes `.el` to each seg. returns successfully rendered segs

                for (i = 0; i < segs.length; i++) {
                        seg = segs[i];
                        skeletonEl = this.renderFillRow(type, seg, className);
                        this.rowEls.eq(seg.row).append(skeletonEl);
                        nodes.push(skeletonEl[0]);
                }

                if (this.elsByFill[type]) {
                        this.elsByFill[type] = this.elsByFill[type].add(nodes);
                }
                else {
                        this.elsByFill[type] = $(nodes);
                }

                return segs;
        },


        // Generates the HTML needed for one row of a fill. Requires the seg's el to be rendered.
        renderFillRow: function(type, seg, className) {
                var colCnt = this.colCnt;
                var startCol = seg.leftCol;
                var endCol = seg.rightCol + 1;
                var skeletonEl;
                var trEl;

                className = className || type.toLowerCase();

                skeletonEl = $(
                        '<div class="fc-' + className + '-skeleton">' +
                                '<table><tr/></table>' +
                        '</div>'
                );
                trEl = skeletonEl.find('tr');

                if (startCol > 0) {
                        trEl.append('<td colspan="' + startCol + '"/>');
                }

                trEl.append(
                        seg.el.attr('colspan', endCol - startCol)
                );

                if (endCol < colCnt) {
                        trEl.append('<td colspan="' + (colCnt - endCol) + '"/>');
                }

                this.bookendCells(trEl);

                return skeletonEl;
        }

});

;;

/* Event-rendering methods for the DayGrid class
----------------------------------------------------------------------------------------------------------------------*/

DayGrid.mixin({

        rowStructs: null, // an array of objects, each holding information about a row's foreground event-rendering


        // Unrenders all events currently rendered on the grid
        unrenderEvents: function() {
                this.removeSegPopover(); // removes the "more.." events popover
                Grid.prototype.unrenderEvents.apply(this, arguments); // calls the super-method
        },


        // Retrieves all rendered segment objects currently rendered on the grid
        getEventSegs: function() {
                return Grid.prototype.getEventSegs.call(this) // get the segments from the super-method
                        .concat(this.popoverSegs || []); // append the segments from the "more..." popover
        },


        // Renders the given background event segments onto the grid
        renderBgSegs: function(segs) {

                // don't render timed background events
                var allDaySegs = $.grep(segs, function(seg) {
                        return seg.footprint.componentFootprint.isAllDay;
                });

                return Grid.prototype.renderBgSegs.call(this, allDaySegs); // call the super-method
        },


        // Renders the given foreground event segments onto the grid
        renderFgSegs: function(segs) {
                var rowStructs;

                // render an `.el` on each seg
                // returns a subset of the segs. segs that were actually rendered
                segs = this.renderFgSegEls(segs);

                rowStructs = this.rowStructs = this.renderSegRows(segs);

                // append to each row's content skeleton
                this.rowEls.each(function(i, rowNode) {
                        $(rowNode).find('.fc-content-skeleton > table').append(
                                rowStructs[i].tbodyEl
                        );
                });

                return segs; // return only the segs that were actually rendered
        },


        // Unrenders all currently rendered foreground event segments
        unrenderFgSegs: function() {
                var rowStructs = this.rowStructs || [];
                var rowStruct;

                while ((rowStruct = rowStructs.pop())) {
                        rowStruct.tbodyEl.remove();
                }

                this.rowStructs = null;
        },


        // Uses the given events array to generate <tbody> elements that should be appended to each row's content skeleton.
        // Returns an array of rowStruct objects (see the bottom of `renderSegRow`).
        // PRECONDITION: each segment shoud already have a rendered and assigned `.el`
        renderSegRows: function(segs) {
                var rowStructs = [];
                var segRows;
                var row;

                segRows = this.groupSegRows(segs); // group into nested arrays

                // iterate each row of segment groupings
                for (row = 0; row < segRows.length; row++) {
                        rowStructs.push(
                                this.renderSegRow(row, segRows[row])
                        );
                }

                return rowStructs;
        },


        // Builds the HTML to be used for the default element for an individual segment
        fgSegHtml: function(seg, disableResizing) {
                var view = this.view;
                var eventDef = seg.footprint.eventDef;
                var isAllDay = seg.footprint.componentFootprint.isAllDay;
                var isDraggable = view.isEventDefDraggable(eventDef);
                var isResizableFromStart = !disableResizing && isAllDay &&
                        seg.isStart && view.isEventDefResizableFromStart(eventDef);
                var isResizableFromEnd = !disableResizing && isAllDay &&
                        seg.isEnd && view.isEventDefResizableFromEnd(eventDef);
                var classes = this.getSegClasses(seg, isDraggable, isResizableFromStart || isResizableFromEnd);
                var skinCss = cssToStr(this.getSegSkinCss(seg));
                var timeHtml = '';
                var timeText;
                var titleHtml;

                classes.unshift('fc-day-grid-event', 'fc-h-event');

                // Only display a timed events time if it is the starting segment
                if (seg.isStart) {
                        timeText = this.getEventTimeText(seg.footprint);
                        if (timeText) {
                                timeHtml = '<span class="fc-time">' + htmlEscape(timeText) + '</span>';
                        }
                }

                titleHtml =
                        '<span class="fc-title">' +
                                (htmlEscape(eventDef.title || '') || '&nbsp;') + // we always want one line of height
                        '</span>';
                
                return '<a class="' + classes.join(' ') + '"' +
                                (eventDef.url ?
                                        ' href="' + htmlEscape(eventDef.url) + '"' :
                                        ''
                                        ) +
                                (skinCss ?
                                        ' style="' + skinCss + '"' :
                                        ''
                                        ) +
                        '>' +
                                '<div class="fc-content">' +
                                        (this.isRTL ?
                                                titleHtml + ' ' + timeHtml : // put a natural space in between
                                                timeHtml + ' ' + titleHtml   //
                                                ) +
                                '</div>' +
                                (isResizableFromStart ?
                                        '<div class="fc-resizer fc-start-resizer" />' :
                                        ''
                                        ) +
                                (isResizableFromEnd ?
                                        '<div class="fc-resizer fc-end-resizer" />' :
                                        ''
                                        ) +
                        '</a>';
        },


        // Given a row # and an array of segments all in the same row, render a <tbody> element, a skeleton that contains
        // the segments. Returns object with a bunch of internal data about how the render was calculated.
        // NOTE: modifies rowSegs
        renderSegRow: function(row, rowSegs) {
                var colCnt = this.colCnt;
                var segLevels = this.buildSegLevels(rowSegs); // group into sub-arrays of levels
                var levelCnt = Math.max(1, segLevels.length); // ensure at least one level
                var tbody = $('<tbody/>');
                var segMatrix = []; // lookup for which segments are rendered into which level+col cells
                var cellMatrix = []; // lookup for all <td> elements of the level+col matrix
                var loneCellMatrix = []; // lookup for <td> elements that only take up a single column
                var i, levelSegs;
                var col;
                var tr;
                var j, seg;
                var td;

                // populates empty cells from the current column (`col`) to `endCol`
                function emptyCellsUntil(endCol) {
                        while (col < endCol) {
                                // try to grab a cell from the level above and extend its rowspan. otherwise, create a fresh cell
                                td = (loneCellMatrix[i - 1] || [])[col];
                                if (td) {
                                        td.attr(
                                                'rowspan',
                                                parseInt(td.attr('rowspan') || 1, 10) + 1
                                        );
                                }
                                else {
                                        td = $('<td/>');
                                        tr.append(td);
                                }
                                cellMatrix[i][col] = td;
                                loneCellMatrix[i][col] = td;
                                col++;
                        }
                }

                for (i = 0; i < levelCnt; i++) { // iterate through all levels
                        levelSegs = segLevels[i];
                        col = 0;
                        tr = $('<tr/>');

                        segMatrix.push([]);
                        cellMatrix.push([]);
                        loneCellMatrix.push([]);

                        // levelCnt might be 1 even though there are no actual levels. protect against this.
                        // this single empty row is useful for styling.
                        if (levelSegs) {
                                for (j = 0; j < levelSegs.length; j++) { // iterate through segments in level
                                        seg = levelSegs[j];

                                        emptyCellsUntil(seg.leftCol);

                                        // create a container that occupies or more columns. append the event element.
                                        td = $('<td class="fc-event-container"/>').append(seg.el);
                                        if (seg.leftCol != seg.rightCol) {
                                                td.attr('colspan', seg.rightCol - seg.leftCol + 1);
                                        }
                                        else { // a single-column segment
                                                loneCellMatrix[i][col] = td;
                                        }

                                        while (col <= seg.rightCol) {
                                                cellMatrix[i][col] = td;
                                                segMatrix[i][col] = seg;
                                                col++;
                                        }

                                        tr.append(td);
                                }
                        }

                        emptyCellsUntil(colCnt); // finish off the row
                        this.bookendCells(tr);
                        tbody.append(tr);
                }

                return { // a "rowStruct"
                        row: row, // the row number
                        tbodyEl: tbody,
                        cellMatrix: cellMatrix,
                        segMatrix: segMatrix,
                        segLevels: segLevels,
                        segs: rowSegs
                };
        },


        // Stacks a flat array of segments, which are all assumed to be in the same row, into subarrays of vertical levels.
        // NOTE: modifies segs
        buildSegLevels: function(segs) {
                var levels = [];
                var i, seg;
                var j;

                // Give preference to elements with certain criteria, so they have
                // a chance to be closer to the top.
                this.sortEventSegs(segs);
                
                for (i = 0; i < segs.length; i++) {
                        seg = segs[i];

                        // loop through levels, starting with the topmost, until the segment doesn't collide with other segments
                        for (j = 0; j < levels.length; j++) {
                                if (!isDaySegCollision(seg, levels[j])) {
                                        break;
                                }
                        }
                        // `j` now holds the desired subrow index
                        seg.level = j;

                        // create new level array if needed and append segment
                        (levels[j] || (levels[j] = [])).push(seg);
                }

                // order segments left-to-right. very important if calendar is RTL
                for (j = 0; j < levels.length; j++) {
                        levels[j].sort(compareDaySegCols);
                }

                return levels;
        },


        // Given a flat array of segments, return an array of sub-arrays, grouped by each segment's row
        groupSegRows: function(segs) {
                var segRows = [];
                var i;

                for (i = 0; i < this.rowCnt; i++) {
                        segRows.push([]);
                }

                for (i = 0; i < segs.length; i++) {
                        segRows[segs[i].row].push(segs[i]);
                }

                return segRows;
        }

});


// Computes whether two segments' columns collide. They are assumed to be in the same row.
function isDaySegCollision(seg, otherSegs) {
        var i, otherSeg;

        for (i = 0; i < otherSegs.length; i++) {
                otherSeg = otherSegs[i];

                if (
                        otherSeg.leftCol <= seg.rightCol &&
                        otherSeg.rightCol >= seg.leftCol
                ) {
                        return true;
                }
        }

        return false;
}


// A cmp function for determining the leftmost event
function compareDaySegCols(a, b) {
        return a.leftCol - b.leftCol;
}

;;

/* Methods relate to limiting the number events for a given day on a DayGrid
----------------------------------------------------------------------------------------------------------------------*/
// NOTE: all the segs being passed around in here are foreground segs

DayGrid.mixin({

        segPopover: null, // the Popover that holds events that can't fit in a cell. null when not visible
        popoverSegs: null, // an array of segment objects that the segPopover holds. null when not visible


        removeSegPopover: function() {
                if (this.segPopover) {
                        this.segPopover.hide(); // in handler, will call segPopover's removeElement
                }
        },


        // Limits the number of "levels" (vertically stacking layers of events) for each row of the grid.
        // `levelLimit` can be false (don't limit), a number, or true (should be computed).
        limitRows: function(levelLimit) {
                var rowStructs = this.rowStructs || [];
                var row; // row #
                var rowLevelLimit;

                for (row = 0; row < rowStructs.length; row++) {
                        this.unlimitRow(row);

                        if (!levelLimit) {
                                rowLevelLimit = false;
                        }
                        else if (typeof levelLimit === 'number') {
                                rowLevelLimit = levelLimit;
                        }
                        else {
                                rowLevelLimit = this.computeRowLevelLimit(row);
                        }

                        if (rowLevelLimit !== false) {
                                this.limitRow(row, rowLevelLimit);
                        }
                }
        },


        // Computes the number of levels a row will accomodate without going outside its bounds.
        // Assumes the row is "rigid" (maintains a constant height regardless of what is inside).
        // `row` is the row number.
        computeRowLevelLimit: function(row) {
                var rowEl = this.rowEls.eq(row); // the containing "fake" row div
                var rowHeight = rowEl.height(); // TODO: cache somehow?
                var trEls = this.rowStructs[row].tbodyEl.children();
                var i, trEl;
                var trHeight;

                function iterInnerHeights(i, childNode) {
                        trHeight = Math.max(trHeight, $(childNode).outerHeight());
                }

                // Reveal one level <tr> at a time and stop when we find one out of bounds
                for (i = 0; i < trEls.length; i++) {
                        trEl = trEls.eq(i).removeClass('fc-limited'); // reset to original state (reveal)

                        // with rowspans>1 and IE8, trEl.outerHeight() would return the height of the largest cell,
                        // so instead, find the tallest inner content element.
                        trHeight = 0;
                        trEl.find('> td > :first-child').each(iterInnerHeights);

                        if (trEl.position().top + trHeight > rowHeight) {
                                return i;
                        }
                }

                return false; // should not limit at all
        },


        // Limits the given grid row to the maximum number of levels and injects "more" links if necessary.
        // `row` is the row number.
        // `levelLimit` is a number for the maximum (inclusive) number of levels allowed.
        limitRow: function(row, levelLimit) {
                var _this = this;
                var rowStruct = this.rowStructs[row];
                var moreNodes = []; // array of "more" <a> links and <td> DOM nodes
                var col = 0; // col #, left-to-right (not chronologically)
                var levelSegs; // array of segment objects in the last allowable level, ordered left-to-right
                var cellMatrix; // a matrix (by level, then column) of all <td> jQuery elements in the row
                var limitedNodes; // array of temporarily hidden level <tr> and segment <td> DOM nodes
                var i, seg;
                var segsBelow; // array of segment objects below `seg` in the current `col`
                var totalSegsBelow; // total number of segments below `seg` in any of the columns `seg` occupies
                var colSegsBelow; // array of segment arrays, below seg, one for each column (offset from segs's first column)
                var td, rowspan;
                var segMoreNodes; // array of "more" <td> cells that will stand-in for the current seg's cell
                var j;
                var moreTd, moreWrap, moreLink;

                // Iterates through empty level cells and places "more" links inside if need be
                function emptyCellsUntil(endCol) { // goes from current `col` to `endCol`
                        while (col < endCol) {
                                segsBelow = _this.getCellSegs(row, col, levelLimit);
                                if (segsBelow.length) {
                                        td = cellMatrix[levelLimit - 1][col];
                                        moreLink = _this.renderMoreLink(row, col, segsBelow);
                                        moreWrap = $('<div/>').append(moreLink);
                                        td.append(moreWrap);
                                        moreNodes.push(moreWrap[0]);
                                }
                                col++;
                        }
                }

                if (levelLimit && levelLimit < rowStruct.segLevels.length) { // is it actually over the limit?
                        levelSegs = rowStruct.segLevels[levelLimit - 1];
                        cellMatrix = rowStruct.cellMatrix;

                        limitedNodes = rowStruct.tbodyEl.children().slice(levelLimit) // get level <tr> elements past the limit
                                .addClass('fc-limited').get(); // hide elements and get a simple DOM-nodes array

                        // iterate though segments in the last allowable level
                        for (i = 0; i < levelSegs.length; i++) {
                                seg = levelSegs[i];
                                emptyCellsUntil(seg.leftCol); // process empty cells before the segment

                                // determine *all* segments below `seg` that occupy the same columns
                                colSegsBelow = [];
                                totalSegsBelow = 0;
                                while (col <= seg.rightCol) {
                                        segsBelow = this.getCellSegs(row, col, levelLimit);
                                        colSegsBelow.push(segsBelow);
                                        totalSegsBelow += segsBelow.length;
                                        col++;
                                }

                                if (totalSegsBelow) { // do we need to replace this segment with one or many "more" links?
                                        td = cellMatrix[levelLimit - 1][seg.leftCol]; // the segment's parent cell
                                        rowspan = td.attr('rowspan') || 1;
                                        segMoreNodes = [];

                                        // make a replacement <td> for each column the segment occupies. will be one for each colspan
                                        for (j = 0; j < colSegsBelow.length; j++) {
                                                moreTd = $('<td class="fc-more-cell"/>').attr('rowspan', rowspan);
                                                segsBelow = colSegsBelow[j];
                                                moreLink = this.renderMoreLink(
                                                        row,
                                                        seg.leftCol + j,
                                                        [ seg ].concat(segsBelow) // count seg as hidden too
                                                );
                                                moreWrap = $('<div/>').append(moreLink);
                                                moreTd.append(moreWrap);
                                                segMoreNodes.push(moreTd[0]);
                                                moreNodes.push(moreTd[0]);
                                        }

                                        td.addClass('fc-limited').after($(segMoreNodes)); // hide original <td> and inject replacements
                                        limitedNodes.push(td[0]);
                                }
                        }

                        emptyCellsUntil(this.colCnt); // finish off the level
                        rowStruct.moreEls = $(moreNodes); // for easy undoing later
                        rowStruct.limitedEls = $(limitedNodes); // for easy undoing later
                }
        },


        // Reveals all levels and removes all "more"-related elements for a grid's row.
        // `row` is a row number.
        unlimitRow: function(row) {
                var rowStruct = this.rowStructs[row];

                if (rowStruct.moreEls) {
                        rowStruct.moreEls.remove();
                        rowStruct.moreEls = null;
                }

                if (rowStruct.limitedEls) {
                        rowStruct.limitedEls.removeClass('fc-limited');
                        rowStruct.limitedEls = null;
                }
        },


        // Renders an <a> element that represents hidden event element for a cell.
        // Responsible for attaching click handler as well.
        renderMoreLink: function(row, col, hiddenSegs) {
                var _this = this;
                var view = this.view;

                return $('<a class="fc-more"/>')
                        .text(
                                this.getMoreLinkText(hiddenSegs.length)
                        )
                        .on('click', function(ev) {
                                var clickOption = _this.opt('eventLimitClick');
                                var date = _this.getCellDate(row, col);
                                var moreEl = $(this);
                                var dayEl = _this.getCellEl(row, col);
                                var allSegs = _this.getCellSegs(row, col);

                                // rescope the segments to be within the cell's date
                                var reslicedAllSegs = _this.resliceDaySegs(allSegs, date);
                                var reslicedHiddenSegs = _this.resliceDaySegs(hiddenSegs, date);

                                if (typeof clickOption === 'function') {
                                        // the returned value can be an atomic option
                                        clickOption = _this.publiclyTrigger('eventLimitClick', {
                                                context: view,
                                                args: [
                                                        {
                                                                date: date.clone(),
                                                                dayEl: dayEl,
                                                                moreEl: moreEl,
                                                                segs: reslicedAllSegs,
                                                                hiddenSegs: reslicedHiddenSegs
                                                        },
                                                        ev,
                                                        view
                                                ]
                                        });
                                }

                                if (clickOption === 'popover') {
                                        _this.showSegPopover(row, col, moreEl, reslicedAllSegs);
                                }
                                else if (typeof clickOption === 'string') { // a view name
                                        view.calendar.zoomTo(date, clickOption);
                                }
                        });
        },


        // Reveals the popover that displays all events within a cell
        showSegPopover: function(row, col, moreLink, segs) {
                var _this = this;
                var view = this.view;
                var moreWrap = moreLink.parent(); // the <div> wrapper around the <a>
                var topEl; // the element we want to match the top coordinate of
                var options;

                if (this.rowCnt == 1) {
                        topEl = view.el; // will cause the popover to cover any sort of header
                }
                else {
                        topEl = this.rowEls.eq(row); // will align with top of row
                }

                options = {
                        className: 'fc-more-popover ' + view.calendar.theme.getClass('popover'),
                        content: this.renderSegPopoverContent(row, col, segs),
                        parentEl: view.el, // attach to root of view. guarantees outside of scrollbars.
                        top: topEl.offset().top,
                        autoHide: true, // when the user clicks elsewhere, hide the popover
                        viewportConstrain: this.opt('popoverViewportConstrain'),
                        hide: function() {
                                // kill everything when the popover is hidden
                                // notify events to be removed
                                if (_this.popoverSegs) {
                                        var seg;
                                        var legacy;
                                        var i;

                                        for (i = 0; i < _this.popoverSegs.length; ++i) {
                                                seg = _this.popoverSegs[i];
                                                legacy = seg.footprint.getEventLegacy();

                                                _this.publiclyTrigger('eventDestroy', {
                                                        context: legacy,
                                                        args: [ legacy, seg.el, view ]
                                                });
                                        }
                                }
                                _this.segPopover.removeElement();
                                _this.segPopover = null;
                                _this.popoverSegs = null;
                        }
                };

                // Determine horizontal coordinate.
                // We use the moreWrap instead of the <td> to avoid border confusion.
                if (this.isRTL) {
                        options.right = moreWrap.offset().left + moreWrap.outerWidth() + 1; // +1 to be over cell border
                }
                else {
                        options.left = moreWrap.offset().left - 1; // -1 to be over cell border
                }

                this.segPopover = new Popover(options);
                this.segPopover.show();

                // the popover doesn't live within the grid's container element, and thus won't get the event
                // delegated-handlers for free. attach event-related handlers to the popover.
                this.bindSegHandlersToEl(this.segPopover.el);
        },


        // Builds the inner DOM contents of the segment popover
        renderSegPopoverContent: function(row, col, segs) {
                var view = this.view;
                var theme = view.calendar.theme;
                var title = this.getCellDate(row, col).format(this.opt('dayPopoverFormat'));
                var content = $(
                        '<div class="fc-header ' + theme.getClass('popoverHeader') + '">' +
                                '<span class="fc-close ' + theme.getIconClass('close') + '"></span>' +
                                '<span class="fc-title">' +
                                        htmlEscape(title) +
                                '</span>' +
                                '<div class="fc-clear"/>' +
                        '</div>' +
                        '<div class="fc-body ' + theme.getClass('popoverContent') + '">' +
                                '<div class="fc-event-container"></div>' +
                        '</div>'
                );
                var segContainer = content.find('.fc-event-container');
                var i;

                // render each seg's `el` and only return the visible segs
                segs = this.renderFgSegEls(segs, true); // disableResizing=true
                this.popoverSegs = segs;

                for (i = 0; i < segs.length; i++) {

                        // because segments in the popover are not part of a grid coordinate system, provide a hint to any
                        // grids that want to do drag-n-drop about which cell it came from
                        this.hitsNeeded();
                        segs[i].hit = this.getCellHit(row, col);
                        this.hitsNotNeeded();

                        segContainer.append(segs[i].el);
                }

                return content;
        },


        // Given the events within an array of segment objects, reslice them to be in a single day
        resliceDaySegs: function(segs, dayDate) {
                var dayStart = dayDate.clone();
                var dayEnd = dayStart.clone().add(1, 'days');
                var dayRange = new UnzonedRange(dayStart, dayEnd);
                var newSegs = [];
                var i;

                for (i = 0; i < segs.length; i++) {
                        newSegs.push.apply(newSegs, // append
                                this.eventFootprintToSegs(segs[i].footprint, dayRange)
                        );
                }

                // force an order because eventsToSegs doesn't guarantee one
                // TODO: research if still needed
                this.sortEventSegs(newSegs);

                return newSegs;
        },


        // Generates the text that should be inside a "more" link, given the number of events it represents
        getMoreLinkText: function(num) {
                var opt = this.opt('eventLimitText');

                if (typeof opt === 'function') {
                        return opt(num);
                }
                else {
                        return '+' + num + ' ' + opt;
                }
        },


        // Returns segments within a given cell.
        // If `startLevel` is specified, returns only events including and below that level. Otherwise returns all segs.
        getCellSegs: function(row, col, startLevel) {
                var segMatrix = this.rowStructs[row].segMatrix;
                var level = startLevel || 0;
                var segs = [];
                var seg;

                while (level < segMatrix.length) {
                        seg = segMatrix[level][col];
                        if (seg) {
                                segs.push(seg);
                        }
                        level++;
                }

                return segs;
        }

});

;;

/* A component that renders one or more columns of vertical time slots
----------------------------------------------------------------------------------------------------------------------*/
// We mixin DayTable, even though there is only a single row of days

var TimeGrid = FC.TimeGrid = Grid.extend(DayTableMixin, {

        dayRanges: null, // UnzonedRange[], of start-end of each day
        slotDuration: null, // duration of a "slot", a distinct time segment on given day, visualized by lines
        snapDuration: null, // granularity of time for dragging and selecting
        snapsPerSlot: null,
        labelFormat: null, // formatting string for times running along vertical axis
        labelInterval: null, // duration of how often a label should be displayed for a slot

        colEls: null, // cells elements in the day-row background
        slatContainerEl: null, // div that wraps all the slat rows
        slatEls: null, // elements running horizontally across all columns
        nowIndicatorEls: null,

        colCoordCache: null,
        slatCoordCache: null,


        constructor: function() {
                Grid.apply(this, arguments); // call the super-constructor

                this.processOptions();
        },


        // Renders the time grid into `this.el`, which should already be assigned.
        // Relies on the view's colCnt. In the future, this component should probably be self-sufficient.
        renderDates: function() {
                this.el.html(this.renderHtml());
                this.colEls = this.el.find('.fc-day, .fc-disabled-day');
                this.slatContainerEl = this.el.find('.fc-slats');
                this.slatEls = this.slatContainerEl.find('tr');

                this.colCoordCache = new CoordCache({
                        els: this.colEls,
                        isHorizontal: true
                });
                this.slatCoordCache = new CoordCache({
                        els: this.slatEls,
                        isVertical: true
                });

                this.renderContentSkeleton();
        },


        // Renders the basic HTML skeleton for the grid
        renderHtml: function() {
                var theme = this.view.calendar.theme;

                return '' +
                        '<div class="fc-bg">' +
                                '<table class="' + theme.getClass('tableGrid') + '">' +
                                        this.renderBgTrHtml(0) + // row=0
                                '</table>' +
                        '</div>' +
                        '<div class="fc-slats">' +
                                '<table class="' + theme.getClass('tableGrid') + '">' +
                                        this.renderSlatRowHtml() +
                                '</table>' +
                        '</div>';
        },


        // Generates the HTML for the horizontal "slats" that run width-wise. Has a time axis on a side. Depends on RTL.
        renderSlatRowHtml: function() {
                var view = this.view;
                var calendar = view.calendar;
                var theme = calendar.theme;
                var isRTL = this.isRTL;
                var html = '';
                var slotTime = moment.duration(+this.view.minTime); // wish there was .clone() for durations
                var slotIterator = moment.duration(0);
                var slotDate; // will be on the view's first day, but we only care about its time
                var isLabeled;
                var axisHtml;

                // Calculate the time for each slot
                while (slotTime < view.maxTime) {
                        slotDate = calendar.msToUtcMoment(this.unzonedRange.startMs).time(slotTime);
                        isLabeled = isInt(divideDurationByDuration(slotIterator, this.labelInterval));

                        axisHtml =
                                '<td class="fc-axis fc-time ' + theme.getClass('widgetContent') + '" ' + view.axisStyleAttr() + '>' +
                                        (isLabeled ?
                                                '<span>' + // for matchCellWidths
                                                        htmlEscape(slotDate.format(this.labelFormat)) +
                                                '</span>' :
                                                ''
                                                ) +
                                '</td>';

                        html +=
                                '<tr data-time="' + slotDate.format('HH:mm:ss') + '"' +
                                        (isLabeled ? '' : ' class="fc-minor"') +
                                        '>' +
                                        (!isRTL ? axisHtml : '') +
                                        '<td class="' + theme.getClass('widgetContent') + '"/>' +
                                        (isRTL ? axisHtml : '') +
                                "</tr>";

                        slotTime.add(this.slotDuration);
                        slotIterator.add(this.slotDuration);
                }

                return html;
        },


        /* Options
        ------------------------------------------------------------------------------------------------------------------*/


        // Parses various options into properties of this object
        processOptions: function() {
                var slotDuration = this.opt('slotDuration');
                var snapDuration = this.opt('snapDuration');
                var input;

                slotDuration = moment.duration(slotDuration);
                snapDuration = snapDuration ? moment.duration(snapDuration) : slotDuration;

                this.slotDuration = slotDuration;
                this.snapDuration = snapDuration;
                this.snapsPerSlot = slotDuration / snapDuration; // TODO: ensure an integer multiple?

                // might be an array value (for TimelineView).
                // if so, getting the most granular entry (the last one probably).
                input = this.opt('slotLabelFormat');
                if ($.isArray(input)) {
                        input = input[input.length - 1];
                }

                this.labelFormat = input ||
                        this.opt('smallTimeFormat'); // the computed default

                input = this.opt('slotLabelInterval');
                this.labelInterval = input ?
                        moment.duration(input) :
                        this.computeLabelInterval(slotDuration);
        },


        // Computes an automatic value for slotLabelInterval
        computeLabelInterval: function(slotDuration) {
                var i;
                var labelInterval;
                var slotsPerLabel;

                // find the smallest stock label interval that results in more than one slots-per-label
                for (i = AGENDA_STOCK_SUB_DURATIONS.length - 1; i >= 0; i--) {
                        labelInterval = moment.duration(AGENDA_STOCK_SUB_DURATIONS[i]);
                        slotsPerLabel = divideDurationByDuration(labelInterval, slotDuration);
                        if (isInt(slotsPerLabel) && slotsPerLabel > 1) {
                                return labelInterval;
                        }
                }

                return moment.duration(slotDuration); // fall back. clone
        },


        // Computes a default event time formatting string if `timeFormat` is not explicitly defined
        computeEventTimeFormat: function() {
                return this.opt('noMeridiemTimeFormat'); // like "6:30" (no AM/PM)
        },


        // Computes a default `displayEventEnd` value if one is not expliclty defined
        computeDisplayEventEnd: function() {
                return true;
        },


        /* Hit System
        ------------------------------------------------------------------------------------------------------------------*/


        prepareHits: function() {
                this.colCoordCache.build();
                this.slatCoordCache.build();
        },


        releaseHits: function() {
                this.colCoordCache.clear();
                // NOTE: don't clear slatCoordCache because we rely on it for computeTimeTop
        },


        queryHit: function(leftOffset, topOffset) {
                var snapsPerSlot = this.snapsPerSlot;
                var colCoordCache = this.colCoordCache;
                var slatCoordCache = this.slatCoordCache;

                if (colCoordCache.isLeftInBounds(leftOffset) && slatCoordCache.isTopInBounds(topOffset)) {
                        var colIndex = colCoordCache.getHorizontalIndex(leftOffset);
                        var slatIndex = slatCoordCache.getVerticalIndex(topOffset);

                        if (colIndex != null && slatIndex != null) {
                                var slatTop = slatCoordCache.getTopOffset(slatIndex);
                                var slatHeight = slatCoordCache.getHeight(slatIndex);
                                var partial = (topOffset - slatTop) / slatHeight; // floating point number between 0 and 1
                                var localSnapIndex = Math.floor(partial * snapsPerSlot); // the snap # relative to start of slat
                                var snapIndex = slatIndex * snapsPerSlot + localSnapIndex;
                                var snapTop = slatTop + (localSnapIndex / snapsPerSlot) * slatHeight;
                                var snapBottom = slatTop + ((localSnapIndex + 1) / snapsPerSlot) * slatHeight;

                                return {
                                        col: colIndex,
                                        snap: snapIndex,
                                        component: this, // needed unfortunately :(
                                        left: colCoordCache.getLeftOffset(colIndex),
                                        right: colCoordCache.getRightOffset(colIndex),
                                        top: snapTop,
                                        bottom: snapBottom
                                };
                        }
                }
        },


        getHitFootprint: function(hit) {
                var start = this.getCellDate(0, hit.col); // row=0
                var time = this.computeSnapTime(hit.snap); // pass in the snap-index
                var end;

                start.time(time);
                end = start.clone().add(this.snapDuration);

                return new ComponentFootprint(
                        new UnzonedRange(start, end),
                        false // all-day?
                );
        },


        getHitEl: function(hit) {
                return this.colEls.eq(hit.col);
        },


        /* Dates
        ------------------------------------------------------------------------------------------------------------------*/


        rangeUpdated: function() {
                var view = this.view;

                this.updateDayTable();

                this.dayRanges = this.dayDates.map(function(dayDate) {
                        return new UnzonedRange(
                                dayDate.clone().add(view.minTime),
                                dayDate.clone().add(view.maxTime)
                        );
                });
        },


        // Given a row number of the grid, representing a "snap", returns a time (Duration) from its start-of-day
        computeSnapTime: function(snapIndex) {
                return moment.duration(this.view.minTime + this.snapDuration * snapIndex);
        },


        // Slices up the given span (unzoned start/end with other misc data) into an array of segments
        componentFootprintToSegs: function(componentFootprint) {
                var segs = this.sliceRangeByTimes(componentFootprint.unzonedRange);
                var i;

                for (i = 0; i < segs.length; i++) {
                        if (this.isRTL) {
                                segs[i].col = this.daysPerRow - 1 - segs[i].dayIndex;
                        }
                        else {
                                segs[i].col = segs[i].dayIndex;
                        }
                }

                return segs;
        },


        sliceRangeByTimes: function(unzonedRange) {
                var segs = [];
                var segRange;
                var dayIndex;

                for (dayIndex = 0; dayIndex < this.daysPerRow; dayIndex++) {

                        segRange = unzonedRange.intersect(this.dayRanges[dayIndex]);

                        if (segRange) {
                                segs.push({
                                        startMs: segRange.startMs,
                                        endMs: segRange.endMs,
                                        isStart: segRange.isStart,
                                        isEnd: segRange.isEnd,
                                        dayIndex: dayIndex
                                });
                        }
                }

                return segs;
        },


        /* Coordinates
        ------------------------------------------------------------------------------------------------------------------*/


        updateSize: function(isResize) { // NOT a standard Grid method
                this.slatCoordCache.build();

                if (isResize) {
                        this.updateSegVerticals(
                                [].concat(this.fgSegs || [], this.bgSegs || [], this.businessSegs || [])
                        );
                }
        },


        getTotalSlatHeight: function() {
                return this.slatContainerEl.outerHeight();
        },


        // Computes the top coordinate, relative to the bounds of the grid, of the given date.
        // `ms` can be a millisecond UTC time OR a UTC moment.
        // A `startOfDayDate` must be given for avoiding ambiguity over how to treat midnight.
        computeDateTop: function(ms, startOfDayDate) {
                return this.computeTimeTop(
                        moment.duration(
                                ms - startOfDayDate.clone().stripTime()
                        )
                );
        },


        // Computes the top coordinate, relative to the bounds of the grid, of the given time (a Duration).
        computeTimeTop: function(time) {
                var len = this.slatEls.length;
                var slatCoverage = (time - this.view.minTime) / this.slotDuration; // floating-point value of # of slots covered
                var slatIndex;
                var slatRemainder;

                // compute a floating-point number for how many slats should be progressed through.
                // from 0 to number of slats (inclusive)
                // constrained because minTime/maxTime might be customized.
                slatCoverage = Math.max(0, slatCoverage);
                slatCoverage = Math.min(len, slatCoverage);

                // an integer index of the furthest whole slat
                // from 0 to number slats (*exclusive*, so len-1)
                slatIndex = Math.floor(slatCoverage);
                slatIndex = Math.min(slatIndex, len - 1);

                // how much further through the slatIndex slat (from 0.0-1.0) must be covered in addition.
                // could be 1.0 if slatCoverage is covering *all* the slots
                slatRemainder = slatCoverage - slatIndex;

                return this.slatCoordCache.getTopPosition(slatIndex) +
                        this.slatCoordCache.getHeight(slatIndex) * slatRemainder;
        },



        /* Event Drag Visualization
        ------------------------------------------------------------------------------------------------------------------*/


        // Renders a visual indication of an event being dragged over the specified date(s).
        // A returned value of `true` signals that a mock "helper" event has been rendered.
        renderDrag: function(eventFootprints, seg) {
                var i;

                if (seg) { // if there is event information for this drag, render a helper event

                        // returns mock event elements
                        // signal that a helper has been rendered
                        return this.renderHelperEventFootprints(eventFootprints);
                }
                else { // otherwise, just render a highlight

                        for (i = 0; i < eventFootprints.length; i++) {
                                this.renderHighlight(eventFootprints[i].componentFootprint);
                        }
                }
        },


        // Unrenders any visual indication of an event being dragged
        unrenderDrag: function() {
                this.unrenderHelper();
                this.unrenderHighlight();
        },


        /* Event Resize Visualization
        ------------------------------------------------------------------------------------------------------------------*/


        // Renders a visual indication of an event being resized
        renderEventResize: function(eventFootprints, seg) {
                return this.renderHelperEventFootprints(eventFootprints, seg); // returns mock event elements
        },


        // Unrenders any visual indication of an event being resized
        unrenderEventResize: function() {
                this.unrenderHelper();
        },


        /* Event Helper
        ------------------------------------------------------------------------------------------------------------------*/


        // Renders a mock "helper" event. `sourceSeg` is the original segment object and might be null (an external drag)
        renderHelperEventFootprintEls: function(eventFootprints, sourceSeg) {
                var segs = this.eventFootprintsToSegs(eventFootprints);

                return this.renderHelperSegs( // returns mock event elements
                        segs,
                        sourceSeg
                );
        },


        // Unrenders any mock helper event
        unrenderHelper: function() {
                this.unrenderHelperSegs();
        },


        /* Business Hours
        ------------------------------------------------------------------------------------------------------------------*/


        renderBusinessHours: function() {
                this.renderBusinessSegs(
                        this.buildBusinessHourSegs()
                );
        },


        unrenderBusinessHours: function() {
                this.unrenderBusinessSegs();
        },


        /* Now Indicator
        ------------------------------------------------------------------------------------------------------------------*/


        getNowIndicatorUnit: function() {
                return 'minute'; // will refresh on the minute
        },


        renderNowIndicator: function(date) {
                // seg system might be overkill, but it handles scenario where line needs to be rendered
                //  more than once because of columns with the same date (resources columns for example)
                var segs = this.componentFootprintToSegs(
                        new ComponentFootprint(
                                new UnzonedRange(date, date.valueOf() + 1), // protect against null range
                                false // all-day
                        )
                );
                var top = this.computeDateTop(date, date);
                var nodes = [];
                var i;

                // render lines within the columns
                for (i = 0; i < segs.length; i++) {
                        nodes.push($('<div class="fc-now-indicator fc-now-indicator-line"></div>')
                                .css('top', top)
                                .appendTo(this.colContainerEls.eq(segs[i].col))[0]);
                }

                // render an arrow over the axis
                if (segs.length > 0) { // is the current time in view?
                        nodes.push($('<div class="fc-now-indicator fc-now-indicator-arrow"></div>')
                                .css('top', top)
                                .appendTo(this.el.find('.fc-content-skeleton'))[0]);
                }

                this.nowIndicatorEls = $(nodes);
        },


        unrenderNowIndicator: function() {
                if (this.nowIndicatorEls) {
                        this.nowIndicatorEls.remove();
                        this.nowIndicatorEls = null;
                }
        },


        /* Selection
        ------------------------------------------------------------------------------------------------------------------*/


        // Renders a visual indication of a selection. Overrides the default, which was to simply render a highlight.
        renderSelectionFootprint: function(componentFootprint) {
                if (this.opt('selectHelper')) { // this setting signals that a mock helper event should be rendered
                        this.renderHelperEventFootprints([
                                this.fabricateEventFootprint(componentFootprint)
                        ]);
                }
                else {
                        this.renderHighlight(componentFootprint);
                }
        },


        // Unrenders any visual indication of a selection
        unrenderSelection: function() {
                this.unrenderHelper();
                this.unrenderHighlight();
        },


        /* Highlight
        ------------------------------------------------------------------------------------------------------------------*/


        renderHighlight: function(componentFootprint) {
                this.renderHighlightSegs(
                        this.componentFootprintToSegs(componentFootprint)
                );
        },


        unrenderHighlight: function() {
                this.unrenderHighlightSegs();
        }

});

;;

/* Methods for rendering SEGMENTS, pieces of content that live on the view
 ( this file is no longer just for events )
----------------------------------------------------------------------------------------------------------------------*/

TimeGrid.mixin({

        colContainerEls: null, // containers for each column

        // inner-containers for each column where different types of segs live
        fgContainerEls: null,
        bgContainerEls: null,
        helperContainerEls: null,
        highlightContainerEls: null,
        businessContainerEls: null,

        // arrays of different types of displayed segments
        fgSegs: null,
        bgSegs: null,
        helperSegs: null,
        highlightSegs: null,
        businessSegs: null,


        // Renders the DOM that the view's content will live in
        renderContentSkeleton: function() {
                var cellHtml = '';
                var i;
                var skeletonEl;

                for (i = 0; i < this.colCnt; i++) {
                        cellHtml +=
                                '<td>' +
                                        '<div class="fc-content-col">' +
                                                '<div class="fc-event-container fc-helper-container"></div>' +
                                                '<div class="fc-event-container"></div>' +
                                                '<div class="fc-highlight-container"></div>' +
                                                '<div class="fc-bgevent-container"></div>' +
                                                '<div class="fc-business-container"></div>' +
                                        '</div>' +
                                '</td>';
                }

                skeletonEl = $(
                        '<div class="fc-content-skeleton">' +
                                '<table>' +
                                        '<tr>' + cellHtml + '</tr>' +
                                '</table>' +
                        '</div>'
                );

                this.colContainerEls = skeletonEl.find('.fc-content-col');
                this.helperContainerEls = skeletonEl.find('.fc-helper-container');
                this.fgContainerEls = skeletonEl.find('.fc-event-container:not(.fc-helper-container)');
                this.bgContainerEls = skeletonEl.find('.fc-bgevent-container');
                this.highlightContainerEls = skeletonEl.find('.fc-highlight-container');
                this.businessContainerEls = skeletonEl.find('.fc-business-container');

                this.bookendCells(skeletonEl.find('tr')); // TODO: do this on string level
                this.el.append(skeletonEl);
        },


        /* Foreground Events
        ------------------------------------------------------------------------------------------------------------------*/


        renderFgSegs: function(segs) {
                segs = this.renderFgSegsIntoContainers(segs, this.fgContainerEls);
                this.fgSegs = segs;
                return segs; // needed for Grid::renderEvents
        },


        unrenderFgSegs: function() {
                this.unrenderNamedSegs('fgSegs');
        },


        /* Foreground Helper Events
        ------------------------------------------------------------------------------------------------------------------*/


        renderHelperSegs: function(segs, sourceSeg) {
                var helperEls = [];
                var i, seg;
                var sourceEl;

                segs = this.renderFgSegsIntoContainers(segs, this.helperContainerEls);

                // Try to make the segment that is in the same row as sourceSeg look the same
                for (i = 0; i < segs.length; i++) {
                        seg = segs[i];
                        if (sourceSeg && sourceSeg.col === seg.col) {
                                sourceEl = sourceSeg.el;
                                seg.el.css({
                                        left: sourceEl.css('left'),
                                        right: sourceEl.css('right'),
                                        'margin-left': sourceEl.css('margin-left'),
                                        'margin-right': sourceEl.css('margin-right')
                                });
                        }
                        helperEls.push(seg.el[0]);
                }

                this.helperSegs = segs;

                return $(helperEls); // must return rendered helpers
        },


        unrenderHelperSegs: function() {
                this.unrenderNamedSegs('helperSegs');
        },


        /* Background Events
        ------------------------------------------------------------------------------------------------------------------*/


        renderBgSegs: function(segs) {
                segs = this.renderFillSegEls('bgEvent', segs); // TODO: old fill system
                this.updateSegVerticals(segs);
                this.attachSegsByCol(this.groupSegsByCol(segs), this.bgContainerEls);
                this.bgSegs = segs;
                return segs; // needed for Grid::renderEvents
        },


        unrenderBgSegs: function() {
                this.unrenderNamedSegs('bgSegs');
        },


        /* Highlight
        ------------------------------------------------------------------------------------------------------------------*/


        renderHighlightSegs: function(segs) {
                segs = this.renderFillSegEls('highlight', segs); // TODO: instead of calling renderFill directly
                this.updateSegVerticals(segs);
                this.attachSegsByCol(this.groupSegsByCol(segs), this.highlightContainerEls);
                this.highlightSegs = segs;
        },


        unrenderHighlightSegs: function() {
                this.unrenderNamedSegs('highlightSegs');
        },


        /* Business Hours
        ------------------------------------------------------------------------------------------------------------------*/


        renderBusinessSegs: function(segs) {
                segs = this.renderFillSegEls('businessHours', segs); // TODO: instead of calling renderFill directly
                this.updateSegVerticals(segs);
                this.attachSegsByCol(this.groupSegsByCol(segs), this.businessContainerEls);
                this.businessSegs = segs;
        },


        unrenderBusinessSegs: function() {
                this.unrenderNamedSegs('businessSegs');
        },


        /* Seg Rendering Utils
        ------------------------------------------------------------------------------------------------------------------*/


        // Given a flat array of segments, return an array of sub-arrays, grouped by each segment's col
        groupSegsByCol: function(segs) {
                var segsByCol = [];
                var i;

                for (i = 0; i < this.colCnt; i++) {
                        segsByCol.push([]);
                }

                for (i = 0; i < segs.length; i++) {
                        segsByCol[segs[i].col].push(segs[i]);
                }

                return segsByCol;
        },


        // Given segments grouped by column, insert the segments' elements into a parallel array of container
        // elements, each living within a column.
        attachSegsByCol: function(segsByCol, containerEls) {
                var col;
                var segs;
                var i;

                for (col = 0; col < this.colCnt; col++) { // iterate each column grouping
                        segs = segsByCol[col];

                        for (i = 0; i < segs.length; i++) {
                                containerEls.eq(col).append(segs[i].el);
                        }
                }
        },


        // Given the name of a property of `this` object, assumed to be an array of segments,
        // loops through each segment and removes from DOM. Will null-out the property afterwards.
        unrenderNamedSegs: function(propName) {
                var segs = this[propName];
                var i;

                if (segs) {
                        for (i = 0; i < segs.length; i++) {
                                segs[i].el.remove();
                        }
                        this[propName] = null;
                }
        },



        /* Foreground Event Rendering Utils
        ------------------------------------------------------------------------------------------------------------------*/


        // Given an array of foreground segments, render a DOM element for each, computes position,
        // and attaches to the column inner-container elements.
        renderFgSegsIntoContainers: function(segs, containerEls) {
                var segsByCol;
                var col;

                segs = this.renderFgSegEls(segs); // will call fgSegHtml
                segsByCol = this.groupSegsByCol(segs);

                for (col = 0; col < this.colCnt; col++) {
                        this.updateFgSegCoords(segsByCol[col]);
                }

                this.attachSegsByCol(segsByCol, containerEls);

                return segs;
        },


        // Renders the HTML for a single event segment's default rendering
        fgSegHtml: function(seg, disableResizing) {
                var view = this.view;
                var calendar = view.calendar;
                var componentFootprint = seg.footprint.componentFootprint;
                var isAllDay = componentFootprint.isAllDay;
                var eventDef = seg.footprint.eventDef;
                var isDraggable = view.isEventDefDraggable(eventDef);
                var isResizableFromStart = !disableResizing && seg.isStart && view.isEventDefResizableFromStart(eventDef);
                var isResizableFromEnd = !disableResizing && seg.isEnd && view.isEventDefResizableFromEnd(eventDef);
                var classes = this.getSegClasses(seg, isDraggable, isResizableFromStart || isResizableFromEnd);
                var skinCss = cssToStr(this.getSegSkinCss(seg));
                var timeText;
                var fullTimeText; // more verbose time text. for the print stylesheet
                var startTimeText; // just the start time text

                classes.unshift('fc-time-grid-event', 'fc-v-event');

                // if the event appears to span more than one day...
                if (view.isMultiDayRange(componentFootprint.unzonedRange)) {
                        // Don't display time text on segments that run entirely through a day.
                        // That would appear as midnight-midnight and would look dumb.
                        // Otherwise, display the time text for the *segment's* times (like 6pm-midnight or midnight-10am)
                        if (seg.isStart || seg.isEnd) {
                                var zonedStart = calendar.msToMoment(seg.startMs);
                                var zonedEnd = calendar.msToMoment(seg.endMs);
                                timeText = this._getEventTimeText(zonedStart, zonedEnd, isAllDay);
                                fullTimeText = this._getEventTimeText(zonedStart, zonedEnd, isAllDay, 'LT');
                                startTimeText = this._getEventTimeText(zonedStart, zonedEnd, isAllDay, null, false); // displayEnd=false
                        }
                }
                else {
                        // Display the normal time text for the *event's* times
                        timeText = this.getEventTimeText(seg.footprint);
                        fullTimeText = this.getEventTimeText(seg.footprint, 'LT');
                        startTimeText = this.getEventTimeText(seg.footprint, null, false); // displayEnd=false
                }

                return '<a class="' + classes.join(' ') + '"' +
                        (eventDef.url ?
                                ' href="' + htmlEscape(eventDef.url) + '"' :
                                ''
                                ) +
                        (skinCss ?
                                ' style="' + skinCss + '"' :
                                ''
                                ) +
                        '>' +
                                '<div class="fc-content">' +
                                        (timeText ?
                                                '<div class="fc-time"' +
                                                ' data-start="' + htmlEscape(startTimeText) + '"' +
                                                ' data-full="' + htmlEscape(fullTimeText) + '"' +
                                                '>' +
                                                        '<span>' + htmlEscape(timeText) + '</span>' +
                                                '</div>' :
                                                ''
                                                ) +
                                        (eventDef.title ?
                                                '<div class="fc-title">' +
                                                        htmlEscape(eventDef.title) +
                                                '</div>' :
                                                ''
                                                ) +
                                '</div>' +
                                '<div class="fc-bg"/>' +
                                /* TODO: write CSS for this
                                (isResizableFromStart ?
                                        '<div class="fc-resizer fc-start-resizer" />' :
                                        ''
                                        ) +
                                */
                                (isResizableFromEnd ?
                                        '<div class="fc-resizer fc-end-resizer" />' :
                                        ''
                                        ) +
                        '</a>';
        },


        /* Seg Position Utils
        ------------------------------------------------------------------------------------------------------------------*/


        // Refreshes the CSS top/bottom coordinates for each segment element.
        // Works when called after initial render, after a window resize/zoom for example.
        updateSegVerticals: function(segs) {
                this.computeSegVerticals(segs);
                this.assignSegVerticals(segs);
        },


        // For each segment in an array, computes and assigns its top and bottom properties
        computeSegVerticals: function(segs) {
                var i, seg;
                var dayDate;

                for (i = 0; i < segs.length; i++) {
                        seg = segs[i];
                        dayDate = this.dayDates[seg.dayIndex];

                        seg.top = this.computeDateTop(seg.startMs, dayDate);
                        seg.bottom = this.computeDateTop(seg.endMs, dayDate);
                }
        },


        // Given segments that already have their top/bottom properties computed, applies those values to
        // the segments' elements.
        assignSegVerticals: function(segs) {
                var i, seg;

                for (i = 0; i < segs.length; i++) {
                        seg = segs[i];
                        seg.el.css(this.generateSegVerticalCss(seg));
                }
        },


        // Generates an object with CSS properties for the top/bottom coordinates of a segment element
        generateSegVerticalCss: function(seg) {
                return {
                        top: seg.top,
                        bottom: -seg.bottom // flipped because needs to be space beyond bottom edge of event container
                };
        },


        /* Foreground Event Positioning Utils
        ------------------------------------------------------------------------------------------------------------------*/


        // Given segments that are assumed to all live in the *same column*,
        // compute their verical/horizontal coordinates and assign to their elements.
        updateFgSegCoords: function(segs) {
                this.computeSegVerticals(segs); // horizontals relies on this
                this.computeFgSegHorizontals(segs); // compute horizontal coordinates, z-index's, and reorder the array
                this.assignSegVerticals(segs);
                this.assignFgSegHorizontals(segs);
        },


        // Given an array of segments that are all in the same column, sets the backwardCoord and forwardCoord on each.
        // NOTE: Also reorders the given array by date!
        computeFgSegHorizontals: function(segs) {
                var levels;
                var level0;
                var i;

                this.sortEventSegs(segs); // order by certain criteria
                levels = buildSlotSegLevels(segs);
                computeForwardSlotSegs(levels);

                if ((level0 = levels[0])) {

                        for (i = 0; i < level0.length; i++) {
                                computeSlotSegPressures(level0[i]);
                        }

                        for (i = 0; i < level0.length; i++) {
                                this.computeFgSegForwardBack(level0[i], 0, 0);
                        }
                }
        },


        // Calculate seg.forwardCoord and seg.backwardCoord for the segment, where both values range
        // from 0 to 1. If the calendar is left-to-right, the seg.backwardCoord maps to "left" and
        // seg.forwardCoord maps to "right" (via percentage). Vice-versa if the calendar is right-to-left.
        //
        // The segment might be part of a "series", which means consecutive segments with the same pressure
        // who's width is unknown until an edge has been hit. `seriesBackwardPressure` is the number of
        // segments behind this one in the current series, and `seriesBackwardCoord` is the starting
        // coordinate of the first segment in the series.
        computeFgSegForwardBack: function(seg, seriesBackwardPressure, seriesBackwardCoord) {
                var forwardSegs = seg.forwardSegs;
                var i;

                if (seg.forwardCoord === undefined) { // not already computed

                        if (!forwardSegs.length) {

                                // if there are no forward segments, this segment should butt up against the edge
                                seg.forwardCoord = 1;
                        }
                        else {

                                // sort highest pressure first
                                this.sortForwardSegs(forwardSegs);

                                // this segment's forwardCoord will be calculated from the backwardCoord of the
                                // highest-pressure forward segment.
                                this.computeFgSegForwardBack(forwardSegs[0], seriesBackwardPressure + 1, seriesBackwardCoord);
                                seg.forwardCoord = forwardSegs[0].backwardCoord;
                        }

                        // calculate the backwardCoord from the forwardCoord. consider the series
                        seg.backwardCoord = seg.forwardCoord -
                                (seg.forwardCoord - seriesBackwardCoord) / // available width for series
                                (seriesBackwardPressure + 1); // # of segments in the series

                        // use this segment's coordinates to computed the coordinates of the less-pressurized
                        // forward segments
                        for (i=0; i<forwardSegs.length; i++) {
                                this.computeFgSegForwardBack(forwardSegs[i], 0, seg.forwardCoord);
                        }
                }
        },


        sortForwardSegs: function(forwardSegs) {
                forwardSegs.sort(proxy(this, 'compareForwardSegs'));
        },


        // A cmp function for determining which forward segment to rely on more when computing coordinates.
        compareForwardSegs: function(seg1, seg2) {
                // put higher-pressure first
                return seg2.forwardPressure - seg1.forwardPressure ||
                        // put segments that are closer to initial edge first (and favor ones with no coords yet)
                        (seg1.backwardCoord || 0) - (seg2.backwardCoord || 0) ||
                        // do normal sorting...
                        this.compareEventSegs(seg1, seg2);
        },


        // Given foreground event segments that have already had their position coordinates computed,
        // assigns position-related CSS values to their elements.
        assignFgSegHorizontals: function(segs) {
                var i, seg;

                for (i = 0; i < segs.length; i++) {
                        seg = segs[i];
                        seg.el.css(this.generateFgSegHorizontalCss(seg));

                        // if the height is short, add a className for alternate styling
                        if (seg.bottom - seg.top < 30) {
                                seg.el.addClass('fc-short');
                        }
                }
        },


        // Generates an object with CSS properties/values that should be applied to an event segment element.
        // Contains important positioning-related properties that should be applied to any event element, customized or not.
        generateFgSegHorizontalCss: function(seg) {
                var shouldOverlap = this.opt('slotEventOverlap');
                var backwardCoord = seg.backwardCoord; // the left side if LTR. the right side if RTL. floating-point
                var forwardCoord = seg.forwardCoord; // the right side if LTR. the left side if RTL. floating-point
                var props = this.generateSegVerticalCss(seg); // get top/bottom first
                var left; // amount of space from left edge, a fraction of the total width
                var right; // amount of space from right edge, a fraction of the total width

                if (shouldOverlap) {
                        // double the width, but don't go beyond the maximum forward coordinate (1.0)
                        forwardCoord = Math.min(1, backwardCoord + (forwardCoord - backwardCoord) * 2);
                }

                if (this.isRTL) {
                        left = 1 - forwardCoord;
                        right = backwardCoord;
                }
                else {
                        left = backwardCoord;
                        right = 1 - forwardCoord;
                }

                props.zIndex = seg.level + 1; // convert from 0-base to 1-based
                props.left = left * 100 + '%';
                props.right = right * 100 + '%';

                if (shouldOverlap && seg.forwardPressure) {
                        // add padding to the edge so that forward stacked events don't cover the resizer's icon
                        props[this.isRTL ? 'marginLeft' : 'marginRight'] = 10 * 2; // 10 is a guesstimate of the icon's width
                }

                return props;
        }

});


// Builds an array of segments "levels". The first level will be the leftmost tier of segments if the calendar is
// left-to-right, or the rightmost if the calendar is right-to-left. Assumes the segments are already ordered by date.
function buildSlotSegLevels(segs) {
        var levels = [];
        var i, seg;
        var j;

        for (i=0; i<segs.length; i++) {
                seg = segs[i];

                // go through all the levels and stop on the first level where there are no collisions
                for (j=0; j<levels.length; j++) {
                        if (!computeSlotSegCollisions(seg, levels[j]).length) {
                                break;
                        }
                }

                seg.level = j;

                (levels[j] || (levels[j] = [])).push(seg);
        }

        return levels;
}


// For every segment, figure out the other segments that are in subsequent
// levels that also occupy the same vertical space. Accumulate in seg.forwardSegs
function computeForwardSlotSegs(levels) {
        var i, level;
        var j, seg;
        var k;

        for (i=0; i<levels.length; i++) {
                level = levels[i];

                for (j=0; j<level.length; j++) {
                        seg = level[j];

                        seg.forwardSegs = [];
                        for (k=i+1; k<levels.length; k++) {
                                computeSlotSegCollisions(seg, levels[k], seg.forwardSegs);
                        }
                }
        }
}


// Figure out which path forward (via seg.forwardSegs) results in the longest path until
// the furthest edge is reached. The number of segments in this path will be seg.forwardPressure
function computeSlotSegPressures(seg) {
        var forwardSegs = seg.forwardSegs;
        var forwardPressure = 0;
        var i, forwardSeg;

        if (seg.forwardPressure === undefined) { // not already computed

                for (i=0; i<forwardSegs.length; i++) {
                        forwardSeg = forwardSegs[i];

                        // figure out the child's maximum forward path
                        computeSlotSegPressures(forwardSeg);

                        // either use the existing maximum, or use the child's forward pressure
                        // plus one (for the forwardSeg itself)
                        forwardPressure = Math.max(
                                forwardPressure,
                                1 + forwardSeg.forwardPressure
                        );
                }

                seg.forwardPressure = forwardPressure;
        }
}


// Find all the segments in `otherSegs` that vertically collide with `seg`.
// Append into an optionally-supplied `results` array and return.
function computeSlotSegCollisions(seg, otherSegs, results) {
        results = results || [];

        for (var i=0; i<otherSegs.length; i++) {
                if (isSlotSegCollision(seg, otherSegs[i])) {
                        results.push(otherSegs[i]);
                }
        }

        return results;
}


// Do these segments occupy the same vertical space?
function isSlotSegCollision(seg1, seg2) {
        return seg1.bottom > seg2.top && seg1.top < seg2.bottom;
}

;;

/* An abstract class from which other views inherit from
----------------------------------------------------------------------------------------------------------------------*/

var View = FC.View = ChronoComponent.extend({

        type: null, // subclass' view name (string)
        name: null, // deprecated. use `type` instead
        title: null, // the text that will be displayed in the header's title

        calendar: null, // owner Calendar object
        viewSpec: null,
        options: null, // hash containing all options. already merged with view-specific-options

        renderQueue: null,
        batchRenderDepth: 0,
        isDatesRendered: false,
        isEventsRendered: false,
        isBaseRendered: false, // related to viewRender/viewDestroy triggers

        queuedScroll: null,

        isSelected: false, // boolean whether a range of time is user-selected or not
        selectedEventInstance: null,

        eventOrderSpecs: null, // criteria for ordering events when they have same date/time

        // for date utils, computed from options
        isHiddenDayHash: null,

        // now indicator
        isNowIndicatorRendered: null,
        initialNowDate: null, // result first getNow call
        initialNowQueriedMs: null, // ms time the getNow was called
        nowIndicatorTimeoutID: null, // for refresh timing of now indicator
        nowIndicatorIntervalID: null, // "


        constructor: function(calendar, viewSpec) {
                this.calendar = calendar;
                this.viewSpec = viewSpec;

                // shortcuts
                this.type = viewSpec.type;
                this.options = viewSpec.options;

                // .name is deprecated
                this.name = this.type;

                ChronoComponent.call(this);

                this.initHiddenDays();
                this.eventOrderSpecs = parseFieldSpecs(this.opt('eventOrder'));

                this.renderQueue = this.buildRenderQueue();
                this.initAutoBatchRender();

                this.initialize();
        },


        buildRenderQueue: function() {
                var _this = this;
                var renderQueue = new RenderQueue({
                        event: this.opt('eventRenderWait')
                });

                renderQueue.on('start', function() {
                        _this.freezeHeight();
                        _this.addScroll(_this.queryScroll());
                });

                renderQueue.on('stop', function() {
                        _this.thawHeight();
                        _this.popScroll();
                });

                return renderQueue;
        },


        initAutoBatchRender: function() {
                var _this = this;

                this.on('before:change', function() {
                        _this.startBatchRender();
                });

                this.on('change', function() {
                        _this.stopBatchRender();
                });
        },


        startBatchRender: function() {
                if (!(this.batchRenderDepth++)) {
                        this.renderQueue.pause();
                }
        },


        stopBatchRender: function() {
                if (!(--this.batchRenderDepth)) {
                        this.renderQueue.resume();
                }
        },


        // A good place for subclasses to initialize member variables
        initialize: function() {
                // subclasses can implement
        },


        // Retrieves an option with the given name
        opt: function(name) {
                return this.options[name];
        },


        /* Title and Date Formatting
        ------------------------------------------------------------------------------------------------------------------*/


        // Computes what the title at the top of the calendar should be for this view
        computeTitle: function() {
                var unzonedRange;

                // for views that span a large unit of time, show the proper interval, ignoring stray days before and after
                if (/^(year|month)$/.test(this.currentRangeUnit)) {
                        unzonedRange = this.currentUnzonedRange;
                }
                else { // for day units or smaller, use the actual day range
                        unzonedRange = this.activeUnzonedRange;
                }

                return this.formatRange(
                        {
                                start: this.calendar.msToMoment(unzonedRange.startMs, this.isRangeAllDay),
                                end: this.calendar.msToMoment(unzonedRange.endMs, this.isRangeAllDay)
                        },
                        this.isRangeAllDay,
                        this.opt('titleFormat') || this.computeTitleFormat(),
                        this.opt('titleRangeSeparator')
                );
        },


        // Generates the format string that should be used to generate the title for the current date range.
        // Attempts to compute the most appropriate format if not explicitly specified with `titleFormat`.
        computeTitleFormat: function() {
                if (this.currentRangeUnit == 'year') {
                        return 'YYYY';
                }
                else if (this.currentRangeUnit == 'month') {
                        return this.opt('monthYearFormat'); // like "September 2014"
                }
                else if (this.currentRangeAs('days') > 1) {
                        return 'll'; // multi-day range. shorter, like "Sep 9 - 10 2014"
                }
                else {
                        return 'LL'; // one day. longer, like "September 9 2014"
                }
        },


        // Element
        // -----------------------------------------------------------------------------------------------------------------


        setElement: function(el) {
                ChronoComponent.prototype.setElement.apply(this, arguments);

                this.bindBaseRenderHandlers();
        },


        removeElement: function() {
                this.unsetDate();
                this.unbindBaseRenderHandlers();

                ChronoComponent.prototype.removeElement.apply(this, arguments);
        },


        // Date Setting/Unsetting
        // -----------------------------------------------------------------------------------------------------------------


        setDate: function(date) {
                var currentDateProfile = this.get('dateProfile');
                var newDateProfile = this.buildDateProfile(date, null, true); // forceToValid=true

                if (
                        !currentDateProfile ||
                        !currentDateProfile.activeUnzonedRange.equals(newDateProfile.activeUnzonedRange)
                ) {
                        this.set('dateProfile', newDateProfile);
                }

                return newDateProfile.date;
        },


        unsetDate: function() {
                this.unset('dateProfile');
        },


        // Date Rendering
        // -----------------------------------------------------------------------------------------------------------------


        requestDateRender: function(dateProfile) {
                var _this = this;

                this.renderQueue.queue(function() {
                        _this.executeDateRender(dateProfile);
                }, 'date', 'init');
        },


        requestDateUnrender: function() {
                var _this = this;

                this.renderQueue.queue(function() {
                        _this.executeDateUnrender();
                }, 'date', 'destroy');
        },


        // Event Data
        // -----------------------------------------------------------------------------------------------------------------


        fetchInitialEvents: function(dateProfile) {
                var calendar = this.calendar;
                var forceAllDay = dateProfile.isRangeAllDay && !this.usesMinMaxTime;

                return calendar.requestEvents(
                        calendar.msToMoment(dateProfile.activeUnzonedRange.startMs, forceAllDay),
                        calendar.msToMoment(dateProfile.activeUnzonedRange.endMs, forceAllDay)
                );
        },


        bindEventChanges: function() {
                this.listenTo(this.calendar, 'eventsReset', this.resetEvents);
        },


        unbindEventChanges: function() {
                this.stopListeningTo(this.calendar, 'eventsReset');
        },


        setEvents: function(eventsPayload) {
                this.set('currentEvents', eventsPayload);
                this.set('hasEvents', true);
        },


        unsetEvents: function() {
                this.unset('currentEvents');
                this.unset('hasEvents');
        },


        resetEvents: function(eventsPayload) {
                this.startBatchRender();
                this.unsetEvents();
                this.setEvents(eventsPayload);
                this.stopBatchRender();
        },


        // Event Rendering
        // -----------------------------------------------------------------------------------------------------------------


        requestEventsRender: function(eventsPayload) {
                var _this = this;

                this.renderQueue.queue(function() {
                        _this.executeEventsRender(eventsPayload);
                }, 'event', 'init');
        },


        requestEventsUnrender: function() {
                var _this = this;

                this.renderQueue.queue(function() {
                        _this.executeEventsUnrender();
                }, 'event', 'destroy');
        },


        // Date High-level Rendering
        // -----------------------------------------------------------------------------------------------------------------


        // if dateProfile not specified, uses current
        executeDateRender: function(dateProfile, skipScroll) {

                this.setDateProfileForRendering(dateProfile);

                if (this.render) {
                        this.render(); // TODO: deprecate
                }

                this.renderDates();
                this.updateSize();
                this.renderBusinessHours(); // might need coordinates, so should go after updateSize()
                this.startNowIndicator();

                if (!skipScroll) {
                        this.addScroll(this.computeInitialDateScroll());
                }

                this.isDatesRendered = true;
                this.trigger('datesRendered');
        },


        executeDateUnrender: function() {

                this.unselect();
                this.stopNowIndicator();

                this.trigger('before:datesUnrendered');

                this.unrenderBusinessHours();
                this.unrenderDates();

                if (this.destroy) {
                        this.destroy(); // TODO: deprecate
                }

                this.isDatesRendered = false;
        },


        // Determing when the "meat" of the view is rendered (aka the base)
        // -----------------------------------------------------------------------------------------------------------------


        bindBaseRenderHandlers: function() {
                var _this = this;

                this.on('datesRendered.baseHandler', function() {
                        _this.onBaseRender();
                });

                this.on('before:datesUnrendered.baseHandler', function() {
                        _this.onBeforeBaseUnrender();
                });
        },


        unbindBaseRenderHandlers: function() {
                this.off('.baseHandler');
        },


        onBaseRender: function() {
                this.applyScreenState();
                this.publiclyTrigger('viewRender', {
                        context: this,
                        args: [ this, this.el ]
                });
        },


        onBeforeBaseUnrender: function() {
                this.applyScreenState();
                this.publiclyTrigger('viewDestroy', {
                        context: this,
                        args: [ this, this.el ]
                });
        },


        // Misc view rendering utils
        // -----------------------------------------------------------------------------------------------------------------


        // Binds DOM handlers to elements that reside outside the view container, such as the document
        bindGlobalHandlers: function() {
                this.listenTo(GlobalEmitter.get(), {
                        touchstart: this.processUnselect,
                        mousedown: this.handleDocumentMousedown
                });
        },


        // Unbinds DOM handlers from elements that reside outside the view container
        unbindGlobalHandlers: function() {
                this.stopListeningTo(GlobalEmitter.get());
        },


        /* Now Indicator
        ------------------------------------------------------------------------------------------------------------------*/


        // Immediately render the current time indicator and begins re-rendering it at an interval,
        // which is defined by this.getNowIndicatorUnit().
        // TODO: somehow do this for the current whole day's background too
        startNowIndicator: function() {
                var _this = this;
                var unit;
                var update;
                var delay; // ms wait value

                if (this.opt('nowIndicator')) {
                        unit = this.getNowIndicatorUnit();
                        if (unit) {
                                update = proxy(this, 'updateNowIndicator'); // bind to `this`

                                this.initialNowDate = this.calendar.getNow();
                                this.initialNowQueriedMs = +new Date();
                                this.renderNowIndicator(this.initialNowDate);
                                this.isNowIndicatorRendered = true;

                                // wait until the beginning of the next interval
                                delay = this.initialNowDate.clone().startOf(unit).add(1, unit) - this.initialNowDate;
                                this.nowIndicatorTimeoutID = setTimeout(function() {
                                        _this.nowIndicatorTimeoutID = null;
                                        update();
                                        delay = +moment.duration(1, unit);
                                        delay = Math.max(100, delay); // prevent too frequent
                                        _this.nowIndicatorIntervalID = setInterval(update, delay); // update every interval
                                }, delay);
                        }
                }
        },


        // rerenders the now indicator, computing the new current time from the amount of time that has passed
        // since the initial getNow call.
        updateNowIndicator: function() {
                if (this.isNowIndicatorRendered) {
                        this.unrenderNowIndicator();
                        this.renderNowIndicator(
                                this.initialNowDate.clone().add(new Date() - this.initialNowQueriedMs) // add ms
                        );
                }
        },


        // Immediately unrenders the view's current time indicator and stops any re-rendering timers.
        // Won't cause side effects if indicator isn't rendered.
        stopNowIndicator: function() {
                if (this.isNowIndicatorRendered) {

                        if (this.nowIndicatorTimeoutID) {
                                clearTimeout(this.nowIndicatorTimeoutID);
                                this.nowIndicatorTimeoutID = null;
                        }
                        if (this.nowIndicatorIntervalID) {
                                clearTimeout(this.nowIndicatorIntervalID);
                                this.nowIndicatorIntervalID = null;
                        }

                        this.unrenderNowIndicator();
                        this.isNowIndicatorRendered = false;
                }
        },


        /* Dimensions
        ------------------------------------------------------------------------------------------------------------------*/
        // TODO: move some of these to ChronoComponent


        // Refreshes anything dependant upon sizing of the container element of the grid
        updateSize: function(isResize) {
                var scroll;

                if (isResize) {
                        scroll = this.queryScroll();
                }

                this.updateHeight(isResize);
                this.updateWidth(isResize);
                this.updateNowIndicator();

                if (isResize) {
                        this.applyScroll(scroll);
                }
        },


        // Refreshes the horizontal dimensions of the calendar
        updateWidth: function(isResize) {
                // subclasses should implement
        },


        // Refreshes the vertical dimensions of the calendar
        updateHeight: function(isResize) {
                var calendar = this.calendar; // we poll the calendar for height information

                this.setHeight(
                        calendar.getSuggestedViewHeight(),
                        calendar.isHeightAuto()
                );
        },


        // Updates the vertical dimensions of the calendar to the specified height.
        // if `isAuto` is set to true, height becomes merely a suggestion and the view should use its "natural" height.
        setHeight: function(height, isAuto) {
                // subclasses should implement
        },


        /* Scroller
        ------------------------------------------------------------------------------------------------------------------*/


        addForcedScroll: function(scroll) {
                this.addScroll(
                        $.extend(scroll, { isForced: true })
                );
        },


        addScroll: function(scroll) {
                var queuedScroll = this.queuedScroll || (this.queuedScroll = {});

                if (!queuedScroll.isForced) {
                        $.extend(queuedScroll, scroll);
                }
        },


        popScroll: function() {
                this.applyQueuedScroll();
                this.queuedScroll = null;
        },


        applyQueuedScroll: function() {
                if (this.queuedScroll) {
                        this.applyScroll(this.queuedScroll);
                }
        },


        queryScroll: function() {
                var scroll = {};

                if (this.isDatesRendered) {
                        $.extend(scroll, this.queryDateScroll());
                }

                return scroll;
        },


        applyScroll: function(scroll) {
                if (this.isDatesRendered) {
                        this.applyDateScroll(scroll);
                }
        },


        computeInitialDateScroll: function() {
                return {}; // subclasses must implement
        },


        queryDateScroll: function() {
                return {}; // subclasses must implement
        },


        applyDateScroll: function(scroll) {
                ; // subclasses must implement
        },


        /* Height Freezing
        ------------------------------------------------------------------------------------------------------------------*/


        freezeHeight: function() {
                this.calendar.freezeContentHeight();
        },


        thawHeight: function() {
                this.calendar.thawContentHeight();
        },


        // Event High-level Rendering
        // -----------------------------------------------------------------------------------------------------------------


        executeEventsRender: function(eventsPayload) {

                if (this.renderEvents) { // for legacy custom views
                        this.renderEvents(convertEventsPayloadToLegacyArray(eventsPayload));
                }
                else {
                        this.renderEventsPayload(eventsPayload);
                }

                this.isEventsRendered = true;

                this.onEventsRender();
        },


        executeEventsUnrender: function() {
                this.onBeforeEventsUnrender();

                if (this.destroyEvents) {
                        this.destroyEvents(); // TODO: deprecate
                }

                this.unrenderEvents();
                this.isEventsRendered = false;
        },


        // Event Rendering Triggers
        // -----------------------------------------------------------------------------------------------------------------


        // Signals that all events have been rendered
        onEventsRender: function() {
                var _this = this;
                var hasSingleHandlers = this.hasPublicHandlers('eventAfterRender');

                if (hasSingleHandlers || this.hasPublicHandlers('eventAfterAllRender')) {
                        this.applyScreenState();
                }

                if (hasSingleHandlers) {
                        this.getEventSegs().forEach(function(seg) {
                                var legacy;

                                if (seg.el) { // necessary?
                                        legacy = seg.footprint.getEventLegacy();

                                        _this.publiclyTrigger('eventAfterRender', {
                                                context: legacy,
                                                args: [ legacy, seg.el, _this ]
                                        });
                                }
                        });
                }

                this.publiclyTrigger('eventAfterAllRender', {
                        context: this,
                        args: [ this ]
                });
        },


        // Signals that all event elements are about to be removed
        onBeforeEventsUnrender: function() {
                var _this = this;

                if (this.hasPublicHandlers('eventDestroy')) {

                        this.applyScreenState();

                        this.getEventSegs().forEach(function(seg) {
                                var legacy;

                                if (seg.el) { // necessary?
                                        legacy = seg.footprint.getEventLegacy();

                                        _this.publiclyTrigger('eventDestroy', {
                                                context: legacy,
                                                args: [ legacy, seg.el, _this ]
                                        });
                                }
                        });
                }
        },


        applyScreenState: function() {
                this.thawHeight();
                this.freezeHeight();
                this.applyQueuedScroll();
        },


        // Event Rendering Utils
        // -----------------------------------------------------------------------------------------------------------------
        // TODO: move this to ChronoComponent


        // Hides all rendered event segments linked to the given event
        showEventsWithId: function(eventDefId) {
                this.getEventSegs().forEach(function(seg) {
                        if (
                                seg.footprint.eventDef.id === eventDefId &&
                                seg.el // necessary?
                        ) {
                                seg.el.css('visibility', '');
                        }
                });
        },


        // Shows all rendered event segments linked to the given event
        hideEventsWithId: function(eventDefId) {
                this.getEventSegs().forEach(function(seg) {
                        if (
                                seg.footprint.eventDef.id === eventDefId &&
                                seg.el // necessary?
                        ) {
                                seg.el.css('visibility', 'hidden');
                        }
                });
        },


        /* Event Drag-n-Drop
        ------------------------------------------------------------------------------------------------------------------*/


        reportEventDrop: function(eventInstance, eventMutation, el, ev) {
                var eventManager = this.calendar.eventManager;
                var undoFunc = eventManager.mutateEventsWithId(
                        eventInstance.def.id,
                        eventMutation,
                        this.calendar
                );
                var dateMutation = eventMutation.dateMutation;

                // update the EventInstance, for handlers
                if (dateMutation) {
                        eventInstance.dateProfile = dateMutation.buildNewDateProfile(
                                eventInstance.dateProfile,
                                this.calendar
                        );
                }

                this.triggerEventDrop(
                        eventInstance,
                        // a drop doesn't necessarily mean a date mutation (ex: resource change)
                        (dateMutation && dateMutation.dateDelta) || moment.duration(),
                        undoFunc,
                        el, ev
                );
        },


        // Triggers event-drop handlers that have subscribed via the API
        triggerEventDrop: function(eventInstance, dateDelta, undoFunc, el, ev) {
                this.publiclyTrigger('eventDrop', {
                        context: el[0],
                        args: [
                                eventInstance.toLegacy(),
                                dateDelta,
                                undoFunc,
                                ev,
                                {}, // {} = jqui dummy
                                this
                        ]
                });
        },


        /* External Element Drag-n-Drop
        ------------------------------------------------------------------------------------------------------------------*/


        // Must be called when an external element, via jQuery UI, has been dropped onto the calendar.
        // `meta` is the parsed data that has been embedded into the dragging event.
        // `dropLocation` is an object that contains the new zoned start/end/allDay values for the event.
        reportExternalDrop: function(singleEventDef, isEvent, isSticky, el, ev, ui) {

                if (isEvent) {
                        this.calendar.eventManager.addEventDef(singleEventDef, isSticky);
                }

                this.triggerExternalDrop(singleEventDef, isEvent, el, ev, ui);
        },


        // Triggers external-drop handlers that have subscribed via the API
        triggerExternalDrop: function(singleEventDef, isEvent, el, ev, ui) {

                // trigger 'drop' regardless of whether element represents an event
                this.publiclyTrigger('drop', {
                        context: el[0],
                        args: [
                                singleEventDef.dateProfile.start.clone(),
                                ev,
                                ui,
                                this
                        ]
                });

                if (isEvent) {
                        // signal an external event landed
                        this.publiclyTrigger('eventReceive', {
                                context: this,
                                args: [
                                        singleEventDef.buildInstance().toLegacy(),
                                        this
                                ]
                        });
                }
        },


        /* Event Resizing
        ------------------------------------------------------------------------------------------------------------------*/


        // Must be called when an event in the view has been resized to a new length
        reportEventResize: function(eventInstance, eventMutation, el, ev) {
                var eventManager = this.calendar.eventManager;
                var undoFunc = eventManager.mutateEventsWithId(
                        eventInstance.def.id,
                        eventMutation,
                        this.calendar
                );

                // update the EventInstance, for handlers
                eventInstance.dateProfile = eventMutation.dateMutation.buildNewDateProfile(
                        eventInstance.dateProfile,
                        this.calendar
                );

                this.triggerEventResize(
                        eventInstance,
                        eventMutation.dateMutation.endDelta,
                        undoFunc,
                        el, ev
                );
        },


        // Triggers event-resize handlers that have subscribed via the API
        triggerEventResize: function(eventInstance, durationDelta, undoFunc, el, ev) {
                this.publiclyTrigger('eventResize', {
                        context: el[0],
                        args: [
                                eventInstance.toLegacy(),
                                durationDelta,
                                undoFunc,
                                ev,
                                {}, // {} = jqui dummy
                                this
                        ]
                });
        },


        /* Selection (time range)
        ------------------------------------------------------------------------------------------------------------------*/


        // Selects a date span on the view. `start` and `end` are both Moments.
        // `ev` is the native mouse event that begin the interaction.
        select: function(footprint, ev) {
                this.unselect(ev);
                this.renderSelectionFootprint(footprint);
                this.reportSelection(footprint, ev);
        },


        renderSelectionFootprint: function(footprint, ev) {
                if (this.renderSelection) { // legacy method in custom view classes
                        this.renderSelection(
                                footprint.toLegacy(this.calendar)
                        );
                }
                else {
                        ChronoComponent.prototype.renderSelectionFootprint.apply(this, arguments);
                }
        },


        // Called when a new selection is made. Updates internal state and triggers handlers.
        reportSelection: function(footprint, ev) {
                this.isSelected = true;
                this.triggerSelect(footprint, ev);
        },


        // Triggers handlers to 'select'
        triggerSelect: function(footprint, ev) {
                var dateProfile = this.calendar.footprintToDateProfile(footprint); // abuse of "Event"DateProfile?

                this.publiclyTrigger('select', {
                        context: this,
                        args: [
                                dateProfile.start,
                                dateProfile.end,
                                ev,
                                this
                        ]
                });
        },


        // Undoes a selection. updates in the internal state and triggers handlers.
        // `ev` is the native mouse event that began the interaction.
        unselect: function(ev) {
                if (this.isSelected) {
                        this.isSelected = false;
                        if (this.destroySelection) {
                                this.destroySelection(); // TODO: deprecate
                        }
                        this.unrenderSelection();
                        this.publiclyTrigger('unselect', {
                                context: this,
                                args: [ ev, this ]
                        });
                }
        },


        /* Event Selection
        ------------------------------------------------------------------------------------------------------------------*/


        selectEventInstance: function(eventInstance) {
                if (
                        !this.selectedEventInstance ||
                        this.selectedEventInstance !== eventInstance
                ) {
                        this.unselectEventInstance();

                        this.getEventSegs().forEach(function(seg) {
                                if (
                                        seg.footprint.eventInstance === eventInstance &&
                                        seg.el // necessary?
                                ) {
                                        seg.el.addClass('fc-selected');
                                }
                        });

                        this.selectedEventInstance = eventInstance;
                }
        },


        unselectEventInstance: function() {
                if (this.selectedEventInstance) {

                        this.getEventSegs().forEach(function(seg) {
                                if (seg.el) { // necessary?
                                        seg.el.removeClass('fc-selected');
                                }
                        });

                        this.selectedEventInstance = null;
                }
        },


        isEventDefSelected: function(eventDef) {
                // event references might change on refetchEvents(), while selectedEventInstance doesn't,
                // so compare IDs
                return this.selectedEventInstance && this.selectedEventInstance.def.id === eventDef.id;
        },


        /* Mouse / Touch Unselecting (time range & event unselection)
        ------------------------------------------------------------------------------------------------------------------*/
        // TODO: move consistently to down/start or up/end?
        // TODO: don't kill previous selection if touch scrolling


        handleDocumentMousedown: function(ev) {
                if (isPrimaryMouseButton(ev)) {
                        this.processUnselect(ev);
                }
        },


        processUnselect: function(ev) {
                this.processRangeUnselect(ev);
                this.processEventUnselect(ev);
        },


        processRangeUnselect: function(ev) {
                var ignore;

                // is there a time-range selection?
                if (this.isSelected && this.opt('unselectAuto')) {
                        // only unselect if the clicked element is not identical to or inside of an 'unselectCancel' element
                        ignore = this.opt('unselectCancel');
                        if (!ignore || !$(ev.target).closest(ignore).length) {
                                this.unselect(ev);
                        }
                }
        },


        processEventUnselect: function(ev) {
                if (this.selectedEventInstance) {
                        if (!$(ev.target).closest('.fc-selected').length) {
                                this.unselectEventInstance();
                        }
                }
        },


        /* Day Click
        ------------------------------------------------------------------------------------------------------------------*/


        // Triggers handlers to 'dayClick'
        // Span has start/end of the clicked area. Only the start is useful.
        triggerDayClick: function(footprint, dayEl, ev) {
                var dateProfile = this.calendar.footprintToDateProfile(footprint); // abuse of "Event"DateProfile?

                this.publiclyTrigger('dayClick', {
                        context: dayEl,
                        args: [ dateProfile.start, ev, this ]
                });
        }

});


View.watch('displayingDates', [ 'dateProfile' ], function(deps) {
        this.requestDateRender(deps.dateProfile);
}, function() {
        this.requestDateUnrender();
});


View.watch('initialEvents', [ 'dateProfile' ], function(deps) {
        return this.fetchInitialEvents(deps.dateProfile);
});


View.watch('bindingEvents', [ 'initialEvents' ], function(deps) {
        this.setEvents(deps.initialEvents);
        this.bindEventChanges();
}, function() {
        this.unbindEventChanges();
        this.unsetEvents();
});


View.watch('displayingEvents', [ 'displayingDates', 'hasEvents' ], function() {
        this.requestEventsRender(this.get('currentEvents')); // if there were event mutations after initialEvents
}, function() {
        this.requestEventsUnrender();
});


function convertEventsPayloadToLegacyArray(eventsPayload) {
        var legacyEvents = [];
        var id;
        var eventInstances;
        var i;

        for (id in eventsPayload) {

                eventInstances = eventsPayload[id].eventInstances;

                for (i = 0; i < eventInstances.length; i++) {
                        legacyEvents.push(
                                eventInstances[i].toLegacy()
                        );
                }
        }

        return legacyEvents;
}

;;

View.mixin({

        // range the view is formally responsible for.
        // for example, a month view might have 1st-31st, excluding padded dates
        currentUnzonedRange: null,
        currentRangeUnit: null, // name of largest unit being displayed, like "month" or "week"

        isRangeAllDay: false,

        // date range with a rendered skeleton
        // includes not-active days that need some sort of DOM
        renderUnzonedRange: null,

        // dates that display events and accept drag-n-drop
        activeUnzonedRange: null,

        // constraint for where prev/next operations can go and where events can be dragged/resized to.
        // an object with optional start and end properties.
        validUnzonedRange: null,

        // how far the current date will move for a prev/next operation
        dateIncrement: null,

        minTime: null, // Duration object that denotes the first visible time of any given day
        maxTime: null, // Duration object that denotes the exclusive visible end time of any given day
        usesMinMaxTime: false, // whether minTime/maxTime will affect the activeUnzonedRange. Views must opt-in.

        // DEPRECATED
        start: null, // use activeUnzonedRange
        end: null, // use activeUnzonedRange
        intervalStart: null, // use currentUnzonedRange
        intervalEnd: null, // use currentUnzonedRange


        /* Date Range Computation
        ------------------------------------------------------------------------------------------------------------------*/


        setDateProfileForRendering: function(dateProfile) {
                var calendar = this.calendar;

                this.currentUnzonedRange = dateProfile.currentUnzonedRange;
                this.currentRangeUnit = dateProfile.currentRangeUnit;
                this.isRangeAllDay = dateProfile.isRangeAllDay;
                this.renderUnzonedRange = dateProfile.renderUnzonedRange;
                this.activeUnzonedRange = dateProfile.activeUnzonedRange;
                this.validUnzonedRange = dateProfile.validUnzonedRange;
                this.dateIncrement = dateProfile.dateIncrement;
                this.minTime = dateProfile.minTime;
                this.maxTime = dateProfile.maxTime;

                // DEPRECATED, but we need to keep it updated...
                this.start = calendar.msToMoment(dateProfile.activeUnzonedRange.startMs, this.isRangeAllDay);
                this.end = calendar.msToMoment(dateProfile.activeUnzonedRange.endMs, this.isRangeAllDay);
                this.intervalStart = calendar.msToMoment(dateProfile.currentUnzonedRange.startMs, this.isRangeAllDay);
                this.intervalEnd = calendar.msToMoment(dateProfile.currentUnzonedRange.endMs, this.isRangeAllDay);

                this.title = this.computeTitle();
                this.calendar.reportViewDatesChanged(this, dateProfile);
        },


        // Builds a structure with info about what the dates/ranges will be for the "prev" view.
        buildPrevDateProfile: function(date) {
                var prevDate = date.clone().startOf(this.currentRangeUnit).subtract(this.dateIncrement);

                return this.buildDateProfile(prevDate, -1);
        },


        // Builds a structure with info about what the dates/ranges will be for the "next" view.
        buildNextDateProfile: function(date) {
                var nextDate = date.clone().startOf(this.currentRangeUnit).add(this.dateIncrement);

                return this.buildDateProfile(nextDate, 1);
        },


        // Builds a structure holding dates/ranges for rendering around the given date.
        // Optional direction param indicates whether the date is being incremented/decremented
        // from its previous value. decremented = -1, incremented = 1 (default).
        buildDateProfile: function(date, direction, forceToValid) {
                var isDateAllDay = !date.hasTime();
                var validUnzonedRange = this.buildValidRange();
                var minTime = null;
                var maxTime = null;
                var currentInfo;
                var renderUnzonedRange;
                var activeUnzonedRange;
                var isValid;

                if (forceToValid) {
                        date = this.calendar.msToUtcMoment(
                                validUnzonedRange.constrainDate(date), // returns MS
                                isDateAllDay
                        );
                }

                currentInfo = this.buildCurrentRangeInfo(date, direction);
                renderUnzonedRange = this.buildRenderRange(currentInfo.unzonedRange, currentInfo.unit);
                activeUnzonedRange = renderUnzonedRange.clone();

                if (!this.opt('showNonCurrentDates')) {
                        activeUnzonedRange = activeUnzonedRange.intersect(currentInfo.unzonedRange);
                }

                minTime = moment.duration(this.opt('minTime'));
                maxTime = moment.duration(this.opt('maxTime'));
                activeUnzonedRange = this.adjustActiveRange(activeUnzonedRange, minTime, maxTime);

                activeUnzonedRange = activeUnzonedRange.intersect(validUnzonedRange);

                if (activeUnzonedRange) {
                        date = this.calendar.msToUtcMoment(
                                activeUnzonedRange.constrainDate(date), // returns MS
                                isDateAllDay
                        );
                }

                // it's invalid if the originally requested date is not contained,
                // or if the range is completely outside of the valid range.
                isValid = currentInfo.unzonedRange.intersectsWith(validUnzonedRange);

                return {
                        validUnzonedRange: validUnzonedRange,
                        currentUnzonedRange: currentInfo.unzonedRange,
                        currentRangeUnit: currentInfo.unit,
                        isRangeAllDay: /^(year|month|week|day)$/.test(currentInfo.unit),
                        activeUnzonedRange: activeUnzonedRange,
                        renderUnzonedRange: renderUnzonedRange,
                        minTime: minTime,
                        maxTime: maxTime,
                        isValid: isValid,
                        date: date,
                        dateIncrement: this.buildDateIncrement(currentInfo.duration)
                                // pass a fallback (might be null) ^
                };
        },


        // Builds an object with optional start/end properties.
        // Indicates the minimum/maximum dates to display.
        buildValidRange: function() {
                return this.getUnzonedRangeOption('validRange', this.calendar.getNow()) ||
                        new UnzonedRange(); // completely open-ended
        },


        // Builds a structure with info about the "current" range, the range that is
        // highlighted as being the current month for example.
        // See buildDateProfile for a description of `direction`.
        // Guaranteed to have `range` and `unit` properties. `duration` is optional.
        // TODO: accept a MS-time instead of a moment `date`?
        buildCurrentRangeInfo: function(date, direction) {
                var duration = null;
                var unit = null;
                var unzonedRange = null;
                var dayCount;

                if (this.viewSpec.duration) {
                        duration = this.viewSpec.duration;
                        unit = this.viewSpec.durationUnit;
                        unzonedRange = this.buildRangeFromDuration(date, direction, duration, unit);
                }
                else if ((dayCount = this.opt('dayCount'))) {
                        unit = 'day';
                        unzonedRange = this.buildRangeFromDayCount(date, direction, dayCount);
                }
                else if ((unzonedRange = this.buildCustomVisibleRange(date))) {
                        unit = computeGreatestUnit(unzonedRange.getStart(), unzonedRange.getEnd());
                }
                else {
                        duration = this.getFallbackDuration();
                        unit = computeGreatestUnit(duration);
                        unzonedRange = this.buildRangeFromDuration(date, direction, duration, unit);
                }

                return { duration: duration, unit: unit, unzonedRange: unzonedRange };
        },


        getFallbackDuration: function() {
                return moment.duration({ days: 1 });
        },


        // Returns a new activeUnzonedRange to have time values (un-ambiguate)
        // minTime or maxTime causes the range to expand.
        adjustActiveRange: function(unzonedRange, minTime, maxTime) {
                var start = unzonedRange.getStart();
                var end = unzonedRange.getEnd();

                if (this.usesMinMaxTime) {

                        if (minTime < 0) {
                                start.time(0).add(minTime);
                        }

                        if (maxTime > 24 * 60 * 60 * 1000) { // beyond 24 hours?
                                end.time(maxTime - (24 * 60 * 60 * 1000));
                        }
                }

                return new UnzonedRange(start, end);
        },


        // Builds the "current" range when it is specified as an explicit duration.
        // `unit` is the already-computed computeGreatestUnit value of duration.
        // TODO: accept a MS-time instead of a moment `date`?
        buildRangeFromDuration: function(date, direction, duration, unit) {
                var alignment = this.opt('dateAlignment');
                var start = date.clone();
                var end;
                var dateIncrementInput;
                var dateIncrementDuration;

                // if the view displays a single day or smaller
                if (duration.as('days') <= 1) {
                        if (this.isHiddenDay(start)) {
                                start = this.skipHiddenDays(start, direction);
                                start.startOf('day');
                        }
                }

                // compute what the alignment should be
                if (!alignment) {
                        dateIncrementInput = this.opt('dateIncrement');

                        if (dateIncrementInput) {
                                dateIncrementDuration = moment.duration(dateIncrementInput);

                                // use the smaller of the two units
                                if (dateIncrementDuration < duration) {
                                        alignment = computeDurationGreatestUnit(dateIncrementDuration, dateIncrementInput);
                                }
                                else {
                                        alignment = unit;
                                }
                        }
                        else {
                                alignment = unit;
                        }
                }

                start.startOf(alignment);
                end = start.clone().add(duration);

                return new UnzonedRange(start, end);
        },


        // Builds the "current" range when a dayCount is specified.
        // TODO: accept a MS-time instead of a moment `date`?
        buildRangeFromDayCount: function(date, direction, dayCount) {
                var customAlignment = this.opt('dateAlignment');
                var runningCount = 0;
                var start = date.clone();
                var end;

                if (customAlignment) {
                        start.startOf(customAlignment);
                }

                start.startOf('day');
                start = this.skipHiddenDays(start, direction);

                end = start.clone();
                do {
                        end.add(1, 'day');
                        if (!this.isHiddenDay(end)) {
                                runningCount++;
                        }
                } while (runningCount < dayCount);

                return new UnzonedRange(start, end);
        },


        // Builds a normalized range object for the "visible" range,
        // which is a way to define the currentUnzonedRange and activeUnzonedRange at the same time.
        // TODO: accept a MS-time instead of a moment `date`?
        buildCustomVisibleRange: function(date) {
                var visibleUnzonedRange = this.getUnzonedRangeOption(
                        'visibleRange',
                        this.calendar.applyTimezone(date) // correct zone. also generates new obj that avoids mutations
                );

                if (visibleUnzonedRange && (visibleUnzonedRange.startMs === null || visibleUnzonedRange.endMs === null)) {
                        return null;
                }

                return visibleUnzonedRange;
        },


        // Computes the range that will represent the element/cells for *rendering*,
        // but which may have voided days/times.
        buildRenderRange: function(currentUnzonedRange, currentRangeUnit) {
                // cut off days in the currentUnzonedRange that are hidden
                return this.trimHiddenDays(currentUnzonedRange);
        },


        // Compute the duration value that should be added/substracted to the current date
        // when a prev/next operation happens.
        buildDateIncrement: function(fallback) {
                var dateIncrementInput = this.opt('dateIncrement');
                var customAlignment;

                if (dateIncrementInput) {
                        return moment.duration(dateIncrementInput);
                }
                else if ((customAlignment = this.opt('dateAlignment'))) {
                        return moment.duration(1, customAlignment);
                }
                else if (fallback) {
                        return fallback;
                }
                else {
                        return moment.duration({ days: 1 });
                }
        },


        // Remove days from the beginning and end of the range that are computed as hidden.
        trimHiddenDays: function(inputUnzonedRange) {
                var start = inputUnzonedRange.getStart();
                var end = inputUnzonedRange.getEnd();

                start = this.skipHiddenDays(start);
                end = this.skipHiddenDays(end, -1, true);

                return new UnzonedRange(start, end);
        },


        // Compute the number of the give units in the "current" range.
        // Will return a floating-point number. Won't round.
        currentRangeAs: function(unit) {
                var currentUnzonedRange = this.currentUnzonedRange;

                return moment.utc(currentUnzonedRange.endMs).diff(
                        moment.utc(currentUnzonedRange.startMs),
                        unit,
                        true
                );
        },


        // For ChronoComponent::getDayClasses
        isDateInOtherMonth: function(date) {
                return false;
        },


        // Arguments after name will be forwarded to a hypothetical function value
        // WARNING: passed-in arguments will be given to generator functions as-is and can cause side-effects.
        // Always clone your objects if you fear mutation.
        getUnzonedRangeOption: function(name) {
                var val = this.opt(name);

                if (typeof val === 'function') {
                        val = val.apply(
                                null,
                                Array.prototype.slice.call(arguments, 1)
                        );
                }

                if (val) {
                        return this.calendar.parseUnzonedRange(val);
                }
        },


        /* Hidden Days
        ------------------------------------------------------------------------------------------------------------------*/


        // Initializes internal variables related to calculating hidden days-of-week
        initHiddenDays: function() {
                var hiddenDays = this.opt('hiddenDays') || []; // array of day-of-week indices that are hidden
                var isHiddenDayHash = []; // is the day-of-week hidden? (hash with day-of-week-index -> bool)
                var dayCnt = 0;
                var i;

                if (this.opt('weekends') === false) {
                        hiddenDays.push(0, 6); // 0=sunday, 6=saturday
                }

                for (i = 0; i < 7; i++) {
                        if (
                                !(isHiddenDayHash[i] = $.inArray(i, hiddenDays) !== -1)
                        ) {
                                dayCnt++;
                        }
                }

                if (!dayCnt) {
                        throw 'invalid hiddenDays'; // all days were hidden? bad.
                }

                this.isHiddenDayHash = isHiddenDayHash;
        },


        // Is the current day hidden?
        // `day` is a day-of-week index (0-6), or a Moment
        isHiddenDay: function(day) {
                if (moment.isMoment(day)) {
                        day = day.day();
                }
                return this.isHiddenDayHash[day];
        },


        // Incrementing the current day until it is no longer a hidden day, returning a copy.
        // DOES NOT CONSIDER validUnzonedRange!
        // If the initial value of `date` is not a hidden day, don't do anything.
        // Pass `isExclusive` as `true` if you are dealing with an end date.
        // `inc` defaults to `1` (increment one day forward each time)
        skipHiddenDays: function(date, inc, isExclusive) {
                var out = date.clone();
                inc = inc || 1;
                while (
                        this.isHiddenDayHash[(out.day() + (isExclusive ? inc : 0) + 7) % 7]
                ) {
                        out.add(inc, 'days');
                }
                return out;
        }

});

;;

/*
Embodies a div that has potential scrollbars
*/
var Scroller = FC.Scroller = Class.extend({

        el: null, // the guaranteed outer element
        scrollEl: null, // the element with the scrollbars
        overflowX: null,
        overflowY: null,


        constructor: function(options) {
                options = options || {};
                this.overflowX = options.overflowX || options.overflow || 'auto';
                this.overflowY = options.overflowY || options.overflow || 'auto';
        },


        render: function() {
                this.el = this.renderEl();
                this.applyOverflow();
        },


        renderEl: function() {
                return (this.scrollEl = $('<div class="fc-scroller"></div>'));
        },


        // sets to natural height, unlocks overflow
        clear: function() {
                this.setHeight('auto');
                this.applyOverflow();
        },


        destroy: function() {
                this.el.remove();
        },


        // Overflow
        // -----------------------------------------------------------------------------------------------------------------


        applyOverflow: function() {
                this.scrollEl.css({
                        'overflow-x': this.overflowX,
                        'overflow-y': this.overflowY
                });
        },


        // Causes any 'auto' overflow values to resolves to 'scroll' or 'hidden'.
        // Useful for preserving scrollbar widths regardless of future resizes.
        // Can pass in scrollbarWidths for optimization.
        lockOverflow: function(scrollbarWidths) {
                var overflowX = this.overflowX;
                var overflowY = this.overflowY;

                scrollbarWidths = scrollbarWidths || this.getScrollbarWidths();

                if (overflowX === 'auto') {
                        overflowX = (
                                        scrollbarWidths.top || scrollbarWidths.bottom || // horizontal scrollbars?
                                        // OR scrolling pane with massless scrollbars?
                                        this.scrollEl[0].scrollWidth - 1 > this.scrollEl[0].clientWidth
                                                // subtract 1 because of IE off-by-one issue
                                ) ? 'scroll' : 'hidden';
                }

                if (overflowY === 'auto') {
                        overflowY = (
                                        scrollbarWidths.left || scrollbarWidths.right || // vertical scrollbars?
                                        // OR scrolling pane with massless scrollbars?
                                        this.scrollEl[0].scrollHeight - 1 > this.scrollEl[0].clientHeight
                                                // subtract 1 because of IE off-by-one issue
                                ) ? 'scroll' : 'hidden';
                }

                this.scrollEl.css({ 'overflow-x': overflowX, 'overflow-y': overflowY });
        },


        // Getters / Setters
        // -----------------------------------------------------------------------------------------------------------------


        setHeight: function(height) {
                this.scrollEl.height(height);
        },


        getScrollTop: function() {
                return this.scrollEl.scrollTop();
        },


        setScrollTop: function(top) {
                this.scrollEl.scrollTop(top);
        },


        getClientWidth: function() {
                return this.scrollEl[0].clientWidth;
        },


        getClientHeight: function() {
                return this.scrollEl[0].clientHeight;
        },


        getScrollbarWidths: function() {
                return getScrollbarWidths(this.scrollEl);
        }

});

;;
function Iterator(items) {
    this.items = items || [];
}


/* Calls a method on every item passing the arguments through */
Iterator.prototype.proxyCall = function(methodName) {
    var args = Array.prototype.slice.call(arguments, 1);
    var results = [];

    this.items.forEach(function(item) {
        results.push(item[methodName].apply(item, args));
    });

    return results;
};

;;

/* Toolbar with buttons and title
----------------------------------------------------------------------------------------------------------------------*/

function Toolbar(calendar, toolbarOptions) {
        var t = this;

        // exports
        t.setToolbarOptions = setToolbarOptions;
        t.render = render;
        t.removeElement = removeElement;
        t.updateTitle = updateTitle;
        t.activateButton = activateButton;
        t.deactivateButton = deactivateButton;
        t.disableButton = disableButton;
        t.enableButton = enableButton;
        t.getViewsWithButtons = getViewsWithButtons;
        t.el = null; // mirrors local `el`

        // locals
        var el;
        var viewsWithButtons = [];

        // method to update toolbar-specific options, not calendar-wide options
        function setToolbarOptions(newToolbarOptions) {
                toolbarOptions = newToolbarOptions;
        }

        // can be called repeatedly and will rerender
        function render() {
                var sections = toolbarOptions.layout;

                if (sections) {
                        if (!el) {
                                el = this.el = $("<div class='fc-toolbar "+ toolbarOptions.extraClasses + "'/>");
                        }
                        else {
                                el.empty();
                        }
                        el.append(renderSection('left'))
                                .append(renderSection('right'))
                                .append(renderSection('center'))
                                .append('<div class="fc-clear"/>');
                }
                else {
                        removeElement();
                }
        }


        function removeElement() {
                if (el) {
                        el.remove();
                        el = t.el = null;
                }
        }


        function renderSection(position) {
                var theme = calendar.theme;
                var sectionEl = $('<div class="fc-' + position + '"/>');
                var buttonStr = toolbarOptions.layout[position];
                var calendarCustomButtons = calendar.opt('customButtons') || {};
                var calendarButtonTextOverrides = calendar.overrides.buttonText || {};
                var calendarButtonText = calendar.opt('buttonText') || {};

                if (buttonStr) {
                        $.each(buttonStr.split(' '), function(i) {
                                var groupChildren = $();
                                var isOnlyButtons = true;
                                var groupEl;

                                $.each(this.split(','), function(j, buttonName) {
                                        var customButtonProps;
                                        var viewSpec;
                                        var buttonClick;
                                        var buttonIcon; // only one of these will be set
                                        var buttonText; // "
                                        var buttonInnerHtml;
                                        var buttonClasses;
                                        var buttonEl;

                                        if (buttonName == 'title') {
                                                groupChildren = groupChildren.add($('<h2>&nbsp;</h2>')); // we always want it to take up height
                                                isOnlyButtons = false;
                                        }
                                        else {

                                                if ((customButtonProps = calendarCustomButtons[buttonName])) {
                                                        buttonClick = function(ev) {
                                                                if (customButtonProps.click) {
                                                                        customButtonProps.click.call(buttonEl[0], ev);
                                                                }
                                                        };
                                                        (buttonIcon = theme.getCustomButtonIconClass(customButtonProps)) ||
                                                        (buttonIcon = theme.getIconClass(buttonName)) ||
                                                        (buttonText = customButtonProps.text); // jshint ignore:line
                                                }
                                                else if ((viewSpec = calendar.getViewSpec(buttonName))) {
                                                        viewsWithButtons.push(buttonName);
                                                        buttonClick = function() {
                                                                calendar.changeView(buttonName);
                                                        };
                                                        (buttonText = viewSpec.buttonTextOverride) ||
                                                        (buttonIcon = theme.getIconClass(buttonName)) ||
                                                        (buttonText = viewSpec.buttonTextDefault); // jshint ignore:line
                                                }
                                                else if (calendar[buttonName]) { // a calendar method
                                                        buttonClick = function() {
                                                                calendar[buttonName]();
                                                        };
                                                        (buttonText = calendarButtonTextOverrides[buttonName]) ||
                                                        (buttonIcon = theme.getIconClass(buttonName)) ||
                                                        (buttonText = calendarButtonText[buttonName]); // jshint ignore:line
                                                        //            ^ everything else is considered default
                                                }

                                                if (buttonClick) {

                                                        buttonClasses = [
                                                                'fc-' + buttonName + '-button',
                                                                theme.getClass('button'),
                                                                theme.getClass('stateDefault')
                                                        ];

                                                        if (buttonText) {
                                                                buttonInnerHtml = htmlEscape(buttonText);
                                                        }
                                                        else if (buttonIcon) {
                                                                buttonInnerHtml = "<span class='" + buttonIcon + "'></span>";
                                                        }

                                                        buttonEl = $( // type="button" so that it doesn't submit a form
                                                                '<button type="button" class="' + buttonClasses.join(' ') + '">' +
                                                                        buttonInnerHtml +
                                                                '</button>'
                                                                )
                                                                .click(function(ev) {
                                                                        // don't process clicks for disabled buttons
                                                                        if (!buttonEl.hasClass(theme.getClass('stateDisabled'))) {

                                                                                buttonClick(ev);

                                                                                // after the click action, if the button becomes the "active" tab, or disabled,
                                                                                // it should never have a hover class, so remove it now.
                                                                                if (
                                                                                        buttonEl.hasClass(theme.getClass('stateActive')) ||
                                                                                        buttonEl.hasClass(theme.getClass('stateDisabled'))
                                                                                ) {
                                                                                        buttonEl.removeClass(theme.getClass('stateHover'));
                                                                                }
                                                                        }
                                                                })
                                                                .mousedown(function() {
                                                                        // the *down* effect (mouse pressed in).
                                                                        // only on buttons that are not the "active" tab, or disabled
                                                                        buttonEl
                                                                                .not('.' + theme.getClass('stateActive'))
                                                                                .not('.' + theme.getClass('stateDisabled'))
                                                                                .addClass(theme.getClass('stateDown'));
                                                                })
                                                                .mouseup(function() {
                                                                        // undo the *down* effect
                                                                        buttonEl.removeClass(theme.getClass('stateDown'));
                                                                })
                                                                .hover(
                                                                        function() {
                                                                                // the *hover* effect.
                                                                                // only on buttons that are not the "active" tab, or disabled
                                                                                buttonEl
                                                                                        .not('.' + theme.getClass('stateActive'))
                                                                                        .not('.' + theme.getClass('stateDisabled'))
                                                                                        .addClass(theme.getClass('stateHover'));
                                                                        },
                                                                        function() {
                                                                                // undo the *hover* effect
                                                                                buttonEl
                                                                                        .removeClass(theme.getClass('stateHover'))
                                                                                        .removeClass(theme.getClass('stateDown')); // if mouseleave happens before mouseup
                                                                        }
                                                                );

                                                        groupChildren = groupChildren.add(buttonEl);
                                                }
                                        }
                                });

                                if (isOnlyButtons) {
                                        groupChildren
                                                .first().addClass(theme.getClass('cornerLeft')).end()
                                                .last().addClass(theme.getClass('cornerRight')).end();
                                }

                                if (groupChildren.length > 1) {
                                        groupEl = $('<div/>');
                                        if (isOnlyButtons) {
                                                groupEl.addClass(theme.getClass('buttonGroup'));
                                        }
                                        groupEl.append(groupChildren);
                                        sectionEl.append(groupEl);
                                }
                                else {
                                        sectionEl.append(groupChildren); // 1 or 0 children
                                }
                        });
                }

                return sectionEl;
        }


        function updateTitle(text) {
                if (el) {
                        el.find('h2').text(text);
                }
        }


        function activateButton(buttonName) {
                if (el) {
                        el.find('.fc-' + buttonName + '-button')
                                .addClass(calendar.theme.getClass('stateActive'));
                }
        }


        function deactivateButton(buttonName) {
                if (el) {
                        el.find('.fc-' + buttonName + '-button')
                                .removeClass(calendar.theme.getClass('stateActive'));
                }
        }


        function disableButton(buttonName) {
                if (el) {
                        el.find('.fc-' + buttonName + '-button')
                                .prop('disabled', true)
                                .addClass(calendar.theme.getClass('stateDisabled'));
                }
        }


        function enableButton(buttonName) {
                if (el) {
                        el.find('.fc-' + buttonName + '-button')
                                .prop('disabled', false)
                                .removeClass(calendar.theme.getClass('stateDisabled'));
                }
        }


        function getViewsWithButtons() {
                return viewsWithButtons;
        }

}

;;

var Calendar = FC.Calendar = Class.extend(EmitterMixin, {

        view: null, // current View object
        viewsByType: null, // holds all instantiated view instances, current or not
        currentDate: null, // unzoned moment. private (public API should use getDate instead)
        theme: null,
        loadingLevel: 0, // number of simultaneous loading tasks


        constructor: function(el, overrides) {

                // declare the current calendar instance relies on GlobalEmitter. needed for garbage collection.
                // unneeded() is called in destroy.
                GlobalEmitter.needed();

                this.el = el;
                this.viewsByType = {};
                this.viewSpecCache = {};

                this.initOptionsInternals(overrides);
                this.initMomentInternals(); // needs to happen after options hash initialized
                this.initCurrentDate();
                this.initEventManager();

                EventManager.call(this); // needs options immediately
                this.initialize();
        },


        // Subclasses can override this for initialization logic after the constructor has been called
        initialize: function() {
        },


        // Public API
        // -----------------------------------------------------------------------------------------------------------------


        getView: function() {
                return this.view;
        },


        publiclyTrigger: function(name, triggerInfo) {
                var optHandler = this.opt(name);
                var context;
                var args;

                if ($.isPlainObject(triggerInfo)) {
                        context = triggerInfo.context;
                        args = triggerInfo.args;
                }
                else if ($.isArray(triggerInfo)) {
                        args = triggerInfo;
                }

                if (context == null) {
                        context = this.el[0]; // fallback context
                }

                if (!args) {
                        args = [];
                }

                this.triggerWith(name, context, args); // Emitter's method

                if (optHandler) {
                        return optHandler.apply(context, args);
                }
        },


        hasPublicHandlers: function(name) {
                return this.hasHandlers(name) ||
                        this.opt(name); // handler specified in options
        },


        // View
        // -----------------------------------------------------------------------------------------------------------------


        // Given a view name for a custom view or a standard view, creates a ready-to-go View object
        instantiateView: function(viewType) {
                var spec = this.getViewSpec(viewType);

                return new spec['class'](this, spec);
        },


        // Returns a boolean about whether the view is okay to instantiate at some point
        isValidViewType: function(viewType) {
                return Boolean(this.getViewSpec(viewType));
        },


        changeView: function(viewName, dateOrRange) {

                if (dateOrRange) {

                        if (dateOrRange.start && dateOrRange.end) { // a range
                                this.recordOptionOverrides({ // will not rerender
                                        visibleRange: dateOrRange
                                });
                        }
                        else { // a date
                                this.currentDate = this.moment(dateOrRange).stripZone(); // just like gotoDate
                        }
                }

                this.renderView(viewName);
        },


        // Forces navigation to a view for the given date.
        // `viewType` can be a specific view name or a generic one like "week" or "day".
        zoomTo: function(newDate, viewType) {
                var spec;

                viewType = viewType || 'day'; // day is default zoom
                spec = this.getViewSpec(viewType) || this.getUnitViewSpec(viewType);

                this.currentDate = newDate.clone();
                this.renderView(spec ? spec.type : null);
        },


        // Current Date
        // -----------------------------------------------------------------------------------------------------------------


        initCurrentDate: function() {
                var defaultDateInput = this.opt('defaultDate');

                // compute the initial ambig-timezone date
                if (defaultDateInput != null) {
                        this.currentDate = this.moment(defaultDateInput).stripZone();
                }
                else {
                        this.currentDate = this.getNow(); // getNow already returns unzoned
                }
        },


        reportViewDatesChanged: function(view, dateProfile) {
                this.currentDate = dateProfile.date; // might have been constrained by view dates
                this.setToolbarsTitle(view.title);
                this.updateToolbarButtons();
        },


        prev: function() {
                var prevInfo = this.view.buildPrevDateProfile(this.currentDate);

                if (prevInfo.isValid) {
                        this.currentDate = prevInfo.date;
                        this.renderView();
                }
        },


        next: function() {
                var nextInfo = this.view.buildNextDateProfile(this.currentDate);

                if (nextInfo.isValid) {
                        this.currentDate = nextInfo.date;
                        this.renderView();
                }
        },


        prevYear: function() {
                this.currentDate.add(-1, 'years');
                this.renderView();
        },


        nextYear: function() {
                this.currentDate.add(1, 'years');
                this.renderView();
        },


        today: function() {
                this.currentDate = this.getNow(); // should deny like prev/next?
                this.renderView();
        },


        gotoDate: function(zonedDateInput) {
                this.currentDate = this.moment(zonedDateInput).stripZone();
                this.renderView();
        },


        incrementDate: function(delta) {
                this.currentDate.add(moment.duration(delta));
                this.renderView();
        },


        // for external API
        getDate: function() {
                return this.applyTimezone(this.currentDate); // infuse the calendar's timezone
        },


        // Loading Triggering
        // -----------------------------------------------------------------------------------------------------------------


        // Should be called when any type of async data fetching begins
        pushLoading: function() {
                if (!(this.loadingLevel++)) {
                        this.publiclyTrigger('loading', [ true, this.view ]);
                }
        },


        // Should be called when any type of async data fetching completes
        popLoading: function() {
                if (!(--this.loadingLevel)) {
                        this.publiclyTrigger('loading', [ false, this.view ]);
                }
        },


        // Selection
        // -----------------------------------------------------------------------------------------------------------------


        // this public method receives start/end dates in any format, with any timezone
        select: function(zonedStartInput, zonedEndInput) {
                this.view.select(
                        this.buildSelectFootprint.apply(this, arguments)
                );
        },


        unselect: function() { // safe to be called before renderView
                if (this.view) {
                        this.view.unselect();
                }
        },


        // Given arguments to the select method in the API, returns a span (unzoned start/end and other info)
        buildSelectFootprint: function(zonedStartInput, zonedEndInput) {
                var start = this.moment(zonedStartInput).stripZone();
                var end;

                if (zonedEndInput) {
                        end = this.moment(zonedEndInput).stripZone();
                }
                else if (start.hasTime()) {
                        end = start.clone().add(this.defaultTimedEventDuration);
                }
                else {
                        end = start.clone().add(this.defaultAllDayEventDuration);
                }

                return new ComponentFootprint(
                        new UnzonedRange(start, end),
                        !start.hasTime()
                );
        },


        // Misc
        // -----------------------------------------------------------------------------------------------------------------


        // will return `null` if invalid range
        parseUnzonedRange: function(rangeInput) {
                var start = null;
                var end = null;

                if (rangeInput.start) {
                        start = this.moment(rangeInput.start).stripZone();
                }

                if (rangeInput.end) {
                        end = this.moment(rangeInput.end).stripZone();
                }

                if (!start && !end) {
                        return null;
                }

                if (start && end && end.isBefore(start)) {
                        return null;
                }

                return new UnzonedRange(start, end);
        },


        rerenderEvents: function() { // API method. destroys old events if previously rendered.
                if (this.elementVisible()) {
                        this.view.flash('displayingEvents');
                }
        },


        initEventManager: function() {
                var _this = this;
                var eventManager = new EventManager(this);
                var rawSources = this.opt('eventSources') || [];
                var singleRawSource = this.opt('events');

                this.eventManager = eventManager;

                if (singleRawSource) {
                        rawSources.unshift(singleRawSource);
                }

                eventManager.on('release', function(eventsPayload) {
                        _this.trigger('eventsReset', eventsPayload);
                });

                eventManager.freeze();

                rawSources.forEach(function(rawSource) {
                        var source = EventSourceParser.parse(rawSource, _this);

                        if (source) {
                                eventManager.addSource(source);
                        }
                });

                eventManager.thaw();
        },


        requestEvents: function(start, end) {
                return this.eventManager.requestEvents(
                        start,
                        end,
                        this.opt('timezone'),
                        !this.opt('lazyFetching')
                );
        }

});

;;
/*
Options binding/triggering system.
*/
Calendar.mixin({

        dirDefaults: null, // option defaults related to LTR or RTL
        localeDefaults: null, // option defaults related to current locale
        overrides: null, // option overrides given to the fullCalendar constructor
        dynamicOverrides: null, // options set with dynamic setter method. higher precedence than view overrides.
        optionsModel: null, // all defaults combined with overrides


        initOptionsInternals: function(overrides) {
                this.overrides = $.extend({}, overrides); // make a copy
                this.dynamicOverrides = {};
                this.optionsModel = new Model();

                this.populateOptionsHash();
        },


        // public getter/setter
        option: function(name, value) {
                var newOptionHash;

                if (typeof name === 'string') {
                        if (value === undefined) { // getter
                                return this.optionsModel.get(name);
                        }
                        else { // setter for individual option
                                newOptionHash = {};
                                newOptionHash[name] = value;
                                this.setOptions(newOptionHash);
                        }
                }
                else if (typeof name === 'object') { // compound setter with object input
                        this.setOptions(name);
                }
        },


        // private getter
        opt: function(name) {
                return this.optionsModel.get(name);
        },


        setOptions: function(newOptionHash) {
                var optionCnt = 0;
                var optionName;

                this.recordOptionOverrides(newOptionHash); // will trigger optionsModel watchers

                for (optionName in newOptionHash) {
                        optionCnt++;
                }

                // special-case handling of single option change.
                // if only one option change, `optionName` will be its name.
                if (optionCnt === 1) {
                        if (optionName === 'height' || optionName === 'contentHeight' || optionName === 'aspectRatio') {
                                this.updateSize(true); // true = allow recalculation of height
                                return;
                        }
                        else if (optionName === 'defaultDate') {
                                return; // can't change date this way. use gotoDate instead
                        }
                        else if (optionName === 'businessHours') {
                                if (this.view) {
                                        this.view.unrenderBusinessHours();
                                        this.view.renderBusinessHours();
                                }
                                return;
                        }
                        else if (optionName === 'timezone') {
                                this.view.flash('initialEvents');
                                return;
                        }
                }

                // catch-all. rerender the header and footer and rebuild/rerender the current view
                this.renderHeader();
                this.renderFooter();

                // even non-current views will be affected by this option change. do before rerender
                // TODO: detangle
                this.viewsByType = {};

                this.reinitView();
        },


        // Computes the flattened options hash for the calendar and assigns to `this.options`.
        // Assumes this.overrides and this.dynamicOverrides have already been initialized.
        populateOptionsHash: function() {
                var locale, localeDefaults;
                var isRTL, dirDefaults;
                var rawOptions;

                locale = firstDefined( // explicit locale option given?
                        this.dynamicOverrides.locale,
                        this.overrides.locale
                );
                localeDefaults = localeOptionHash[locale];
                if (!localeDefaults) { // explicit locale option not given or invalid?
                        locale = Calendar.defaults.locale;
                        localeDefaults = localeOptionHash[locale] || {};
                }

                isRTL = firstDefined( // based on options computed so far, is direction RTL?
                        this.dynamicOverrides.isRTL,
                        this.overrides.isRTL,
                        localeDefaults.isRTL,
                        Calendar.defaults.isRTL
                );
                dirDefaults = isRTL ? Calendar.rtlDefaults : {};

                this.dirDefaults = dirDefaults;
                this.localeDefaults = localeDefaults;

                rawOptions = mergeOptions([ // merge defaults and overrides. lowest to highest precedence
                        Calendar.defaults, // global defaults
                        dirDefaults,
                        localeDefaults,
                        this.overrides,
                        this.dynamicOverrides
                ]);
                populateInstanceComputableOptions(rawOptions); // fill in gaps with computed options

                this.optionsModel.reset(rawOptions);
        },


        // stores the new options internally, but does not rerender anything.
        recordOptionOverrides: function(newOptionHash) {
                var optionName;

                for (optionName in newOptionHash) {
                        this.dynamicOverrides[optionName] = newOptionHash[optionName];
                }

                this.viewSpecCache = {}; // the dynamic override invalidates the options in this cache, so just clear it
                this.populateOptionsHash(); // this.options needs to be recomputed after the dynamic override
        }

});

;;

Calendar.mixin({

        defaultAllDayEventDuration: null,
        defaultTimedEventDuration: null,
        localeData: null,


        initMomentInternals: function() {
                var _this = this;

                this.defaultAllDayEventDuration = moment.duration(this.opt('defaultAllDayEventDuration'));
                this.defaultTimedEventDuration = moment.duration(this.opt('defaultTimedEventDuration'));

                // Called immediately, and when any of the options change.
                // Happens before any internal objects rebuild or rerender, because this is very core.
                this.optionsModel.watch('buildingMomentLocale', [
                        '?locale', '?monthNames', '?monthNamesShort', '?dayNames', '?dayNamesShort',
                        '?firstDay', '?weekNumberCalculation'
                ], function(opts) {
                        var weekNumberCalculation = opts.weekNumberCalculation;
                        var firstDay = opts.firstDay;
                        var _week;

                        // normalize
                        if (weekNumberCalculation === 'iso') {
                                weekNumberCalculation = 'ISO'; // normalize
                        }

                        var localeData = Object.create( // make a cheap copy
                                getMomentLocaleData(opts.locale) // will fall back to en
                        );

                        if (opts.monthNames) {
                                localeData._months = opts.monthNames;
                        }
                        if (opts.monthNamesShort) {
                                localeData._monthsShort = opts.monthNamesShort;
                        }
                        if (opts.dayNames) {
                                localeData._weekdays = opts.dayNames;
                        }
                        if (opts.dayNamesShort) {
                                localeData._weekdaysShort = opts.dayNamesShort;
                        }

                        if (firstDay == null && weekNumberCalculation === 'ISO') {
                                firstDay = 1;
                        }
                        if (firstDay != null) {
                                _week = Object.create(localeData._week); // _week: { dow: # }
                                _week.dow = firstDay;
                                localeData._week = _week;
                        }

                        if ( // whitelist certain kinds of input
                                weekNumberCalculation === 'ISO' ||
                                weekNumberCalculation === 'local' ||
                                typeof weekNumberCalculation === 'function'
                        ) {
                                localeData._fullCalendar_weekCalc = weekNumberCalculation; // moment-ext will know what to do with it
                        }

                        _this.localeData = localeData;

                        // If the internal current date object already exists, move to new locale.
                        // We do NOT need to do this technique for event dates, because this happens when converting to "segments".
                        if (_this.currentDate) {
                                _this.localizeMoment(_this.currentDate); // sets to localeData
                        }
                });
        },


        // Builds a moment using the settings of the current calendar: timezone and locale.
        // Accepts anything the vanilla moment() constructor accepts.
        moment: function() {
                var mom;

                if (this.opt('timezone') === 'local') {
                        mom = FC.moment.apply(null, arguments);

                        // Force the moment to be local, because FC.moment doesn't guarantee it.
                        if (mom.hasTime()) { // don't give ambiguously-timed moments a local zone
                                mom.local();
                        }
                }
                else if (this.opt('timezone') === 'UTC') {
                        mom = FC.moment.utc.apply(null, arguments); // process as UTC
                }
                else {
                        mom = FC.moment.parseZone.apply(null, arguments); // let the input decide the zone
                }

                this.localizeMoment(mom); // TODO

                return mom;
        },


        msToMoment: function(ms, forceAllDay) {
                var mom = FC.moment.utc(ms); // TODO: optimize by using Date.UTC

                if (forceAllDay) {
                        mom.stripTime();
                }
                else {
                        mom = this.applyTimezone(mom); // may or may not apply locale
                }

                this.localizeMoment(mom);

                return mom;
        },


        msToUtcMoment: function(ms, forceAllDay) {
                var mom = FC.moment.utc(ms); // TODO: optimize by using Date.UTC

                if (forceAllDay) {
                        mom.stripTime();
                }

                this.localizeMoment(mom);

                return mom;
        },


        // Updates the given moment's locale settings to the current calendar locale settings.
        localizeMoment: function(mom) {
                mom._locale = this.localeData;
        },


        // Returns a boolean about whether or not the calendar knows how to calculate
        // the timezone offset of arbitrary dates in the current timezone.
        getIsAmbigTimezone: function() {
                return this.opt('timezone') !== 'local' && this.opt('timezone') !== 'UTC';
        },


        // Returns a copy of the given date in the current timezone. Has no effect on dates without times.
        applyTimezone: function(date) {
                if (!date.hasTime()) {
                        return date.clone();
                }

                var zonedDate = this.moment(date.toArray());
                var timeAdjust = date.time() - zonedDate.time();
                var adjustedZonedDate;

                // Safari sometimes has problems with this coersion when near DST. Adjust if necessary. (bug #2396)
                if (timeAdjust) { // is the time result different than expected?
                        adjustedZonedDate = zonedDate.clone().add(timeAdjust); // add milliseconds
                        if (date.time() - adjustedZonedDate.time() === 0) { // does it match perfectly now?
                                zonedDate = adjustedZonedDate;
                        }
                }

                return zonedDate;
        },


        /*
        Assumes the footprint is non-open-ended.
        */
        footprintToDateProfile: function(componentFootprint, ignoreEnd) {
                var start = FC.moment.utc(componentFootprint.unzonedRange.startMs);
                var end;

                if (!ignoreEnd) {
                        end = FC.moment.utc(componentFootprint.unzonedRange.endMs);
                }

                if (componentFootprint.isAllDay) {
                        start.stripTime();

                        if (end) {
                                end.stripTime();
                        }
                }
                else {
                        start = this.applyTimezone(start);

                        if (end) {
                                end = this.applyTimezone(end);
                        }
                }

                return new EventDateProfile(start, end, this);
        },


        // Returns a moment for the current date, as defined by the client's computer or from the `now` option.
        // Will return an moment with an ambiguous timezone.
        getNow: function() {
                var now = this.opt('now');
                if (typeof now === 'function') {
                        now = now();
                }
                return this.moment(now).stripZone();
        },


        // Produces a human-readable string for the given duration.
        // Side-effect: changes the locale of the given duration.
        humanizeDuration: function(duration) {
                return duration.locale(this.opt('locale')).humanize();
        },



        // Event-Specific Date Utilities. TODO: move
        // -----------------------------------------------------------------------------------------------------------------


        // Get an event's normalized end date. If not present, calculate it from the defaults.
        getEventEnd: function(event) {
                if (event.end) {
                        return event.end.clone();
                }
                else {
                        return this.getDefaultEventEnd(event.allDay, event.start);
                }
        },


        // Given an event's allDay status and start date, return what its fallback end date should be.
        // TODO: rename to computeDefaultEventEnd
        getDefaultEventEnd: function(allDay, zonedStart) {
                var end = zonedStart.clone();

                if (allDay) {
                        end.stripTime().add(this.defaultAllDayEventDuration);
                }
                else {
                        end.add(this.defaultTimedEventDuration);
                }

                if (this.getIsAmbigTimezone()) {
                        end.stripZone(); // we don't know what the tzo should be
                }

                return end;
        }

});

;;

Calendar.mixin({

        viewSpecCache: null, // cache of view definitions (initialized in Calendar.js)


        // Gets information about how to create a view. Will use a cache.
        getViewSpec: function(viewType) {
                var cache = this.viewSpecCache;

                return cache[viewType] || (cache[viewType] = this.buildViewSpec(viewType));
        },


        // Given a duration singular unit, like "week" or "day", finds a matching view spec.
        // Preference is given to views that have corresponding buttons.
        getUnitViewSpec: function(unit) {
                var viewTypes;
                var i;
                var spec;

                if ($.inArray(unit, unitsDesc) != -1) {

                        // put views that have buttons first. there will be duplicates, but oh well
                        viewTypes = this.header.getViewsWithButtons(); // TODO: include footer as well?
                        $.each(FC.views, function(viewType) { // all views
                                viewTypes.push(viewType);
                        });

                        for (i = 0; i < viewTypes.length; i++) {
                                spec = this.getViewSpec(viewTypes[i]);
                                if (spec) {
                                        if (spec.singleUnit == unit) {
                                                return spec;
                                        }
                                }
                        }
                }
        },


        // Builds an object with information on how to create a given view
        buildViewSpec: function(requestedViewType) {
                var viewOverrides = this.overrides.views || {};
                var specChain = []; // for the view. lowest to highest priority
                var defaultsChain = []; // for the view. lowest to highest priority
                var overridesChain = []; // for the view. lowest to highest priority
                var viewType = requestedViewType;
                var spec; // for the view
                var overrides; // for the view
                var durationInput;
                var duration;
                var unit;

                // iterate from the specific view definition to a more general one until we hit an actual View class
                while (viewType) {
                        spec = fcViews[viewType];
                        overrides = viewOverrides[viewType];
                        viewType = null; // clear. might repopulate for another iteration

                        if (typeof spec === 'function') { // TODO: deprecate
                                spec = { 'class': spec };
                        }

                        if (spec) {
                                specChain.unshift(spec);
                                defaultsChain.unshift(spec.defaults || {});
                                durationInput = durationInput || spec.duration;
                                viewType = viewType || spec.type;
                        }

                        if (overrides) {
                                overridesChain.unshift(overrides); // view-specific option hashes have options at zero-level
                                durationInput = durationInput || overrides.duration;
                                viewType = viewType || overrides.type;
                        }
                }

                spec = mergeProps(specChain);
                spec.type = requestedViewType;
                if (!spec['class']) {
                        return false;
                }

                // fall back to top-level `duration` option
                durationInput = durationInput ||
                        this.dynamicOverrides.duration ||
                        this.overrides.duration;

                if (durationInput) {
                        duration = moment.duration(durationInput);

                        if (duration.valueOf()) { // valid?

                                unit = computeDurationGreatestUnit(duration, durationInput);

                                spec.duration = duration;
                                spec.durationUnit = unit;

                                // view is a single-unit duration, like "week" or "day"
                                // incorporate options for this. lowest priority
                                if (duration.as(unit) === 1) {
                                        spec.singleUnit = unit;
                                        overridesChain.unshift(viewOverrides[unit] || {});
                                }
                        }
                }

                spec.defaults = mergeOptions(defaultsChain);
                spec.overrides = mergeOptions(overridesChain);

                this.buildViewSpecOptions(spec);
                this.buildViewSpecButtonText(spec, requestedViewType);

                return spec;
        },


        // Builds and assigns a view spec's options object from its already-assigned defaults and overrides
        buildViewSpecOptions: function(spec) {
                spec.options = mergeOptions([ // lowest to highest priority
                        Calendar.defaults, // global defaults
                        spec.defaults, // view's defaults (from ViewSubclass.defaults)
                        this.dirDefaults,
                        this.localeDefaults, // locale and dir take precedence over view's defaults!
                        this.overrides, // calendar's overrides (options given to constructor)
                        spec.overrides, // view's overrides (view-specific options)
                        this.dynamicOverrides // dynamically set via setter. highest precedence
                ]);
                populateInstanceComputableOptions(spec.options);
        },


        // Computes and assigns a view spec's buttonText-related options
        buildViewSpecButtonText: function(spec, requestedViewType) {

                // given an options object with a possible `buttonText` hash, lookup the buttonText for the
                // requested view, falling back to a generic unit entry like "week" or "day"
                function queryButtonText(options) {
                        var buttonText = options.buttonText || {};
                        return buttonText[requestedViewType] ||
                                // view can decide to look up a certain key
                                (spec.buttonTextKey ? buttonText[spec.buttonTextKey] : null) ||
                                // a key like "month"
                                (spec.singleUnit ? buttonText[spec.singleUnit] : null);
                }

                // highest to lowest priority
                spec.buttonTextOverride =
                        queryButtonText(this.dynamicOverrides) ||
                        queryButtonText(this.overrides) || // constructor-specified buttonText lookup hash takes precedence
                        spec.overrides.buttonText; // `buttonText` for view-specific options is a string

                // highest to lowest priority. mirrors buildViewSpecOptions
                spec.buttonTextDefault =
                        queryButtonText(this.localeDefaults) ||
                        queryButtonText(this.dirDefaults) ||
                        spec.defaults.buttonText || // a single string. from ViewSubclass.defaults
                        queryButtonText(Calendar.defaults) ||
                        (spec.duration ? this.humanizeDuration(spec.duration) : null) || // like "3 days"
                        requestedViewType; // fall back to given view name
        }

});

;;

Calendar.mixin({

        el: null,
        contentEl: null,
        suggestedViewHeight: null,
        windowResizeProxy: null,
        ignoreWindowResize: 0,


        render: function() {
                if (!this.contentEl) {
                        this.initialRender();
                }
                else if (this.elementVisible()) {
                        // mainly for the public API
                        this.calcSize();
                        this.renderView();
                }
        },


        initialRender: function() {
                var _this = this;
                var el = this.el;

                el.addClass('fc');

                // event delegation for nav links
                el.on('click.fc', 'a[data-goto]', function(ev) {
                        var anchorEl = $(this);
                        var gotoOptions = anchorEl.data('goto'); // will automatically parse JSON
                        var date = _this.moment(gotoOptions.date);
                        var viewType = gotoOptions.type;

                        // property like "navLinkDayClick". might be a string or a function
                        var customAction = _this.view.opt('navLink' + capitaliseFirstLetter(viewType) + 'Click');

                        if (typeof customAction === 'function') {
                                customAction(date, ev);
                        }
                        else {
                                if (typeof customAction === 'string') {
                                        viewType = customAction;
                                }
                                _this.zoomTo(date, viewType);
                        }
                });

                // called immediately, and upon option change
                this.optionsModel.watch('settingTheme', [ '?theme', '?themeSystem' ], function(opts) {
                        var themeClass = ThemeRegistry.getThemeClass(opts.themeSystem || opts.theme);
                        var theme = new themeClass(_this.optionsModel);
                        var widgetClass = theme.getClass('widget');

                        _this.theme = theme;

                        if (widgetClass) {
                                el.addClass(widgetClass);
                        }
                }, function() {
                        var widgetClass = _this.theme.getClass('widget');

                        _this.theme = null;

                        if (widgetClass) {
                                el.removeClass(widgetClass);
                        }
                });

                // called immediately, and upon option change.
                // HACK: locale often affects isRTL, so we explicitly listen to that too.
                this.optionsModel.watch('applyingDirClasses', [ '?isRTL', '?locale' ], function(opts) {
                        el.toggleClass('fc-ltr', !opts.isRTL);
                        el.toggleClass('fc-rtl', opts.isRTL);
                });

                this.contentEl = $("<div class='fc-view-container'/>").prependTo(el);

                this.initToolbars();
                this.renderHeader();
                this.renderFooter();
                this.renderView(this.opt('defaultView'));

                if (this.opt('handleWindowResize')) {
                        $(window).resize(
                                this.windowResizeProxy = debounce( // prevents rapid calls
                                        this.windowResize.bind(this),
                                        this.opt('windowResizeDelay')
                                )
                        );
                }
        },


        destroy: function() {

                if (this.view) {
                        this.view.removeElement();

                        // NOTE: don't null-out this.view in case API methods are called after destroy.
                        // It is still the "current" view, just not rendered.
                }

                this.toolbarsManager.proxyCall('removeElement');
                this.contentEl.remove();
                this.el.removeClass('fc fc-ltr fc-rtl');

                // removes theme-related root className
                this.optionsModel.unwatch('settingTheme');

                this.el.off('.fc'); // unbind nav link handlers

                if (this.windowResizeProxy) {
                        $(window).unbind('resize', this.windowResizeProxy);
                        this.windowResizeProxy = null;
                }

                GlobalEmitter.unneeded();
        },


        elementVisible: function() {
                return this.el.is(':visible');
        },



        // View Rendering
        // -----------------------------------------------------------------------------------


        // Renders a view because of a date change, view-type change, or for the first time.
        // If not given a viewType, keep the current view but render different dates.
        // Accepts an optional scroll state to restore to.
        renderView: function(viewType, forcedScroll) {

                this.ignoreWindowResize++;

                var needsClearView = this.view && viewType && this.view.type !== viewType;

                // if viewType is changing, remove the old view's rendering
                if (needsClearView) {
                        this.freezeContentHeight(); // prevent a scroll jump when view element is removed
                        this.clearView();
                }

                // if viewType changed, or the view was never created, create a fresh view
                if (!this.view && viewType) {
                        this.view =
                                this.viewsByType[viewType] ||
                                (this.viewsByType[viewType] = this.instantiateView(viewType));

                        this.view.setElement(
                                $("<div class='fc-view fc-" + viewType + "-view' />").appendTo(this.contentEl)
                        );
                        this.toolbarsManager.proxyCall('activateButton', viewType);
                }

                if (this.view) {

                        if (forcedScroll) {
                                this.view.addForcedScroll(forcedScroll);
                        }

                        if (this.elementVisible()) {
                                this.view.setDate(this.currentDate);
                        }
                }

                if (needsClearView) {
                        this.thawContentHeight();
                }

                this.ignoreWindowResize--;
        },


        // Unrenders the current view and reflects this change in the Header.
        // Unregsiters the `view`, but does not remove from viewByType hash.
        clearView: function() {
                this.toolbarsManager.proxyCall('deactivateButton', this.view.type);
                this.view.removeElement();
                this.view = null;
        },


        // Destroys the view, including the view object. Then, re-instantiates it and renders it.
        // Maintains the same scroll state.
        // TODO: maintain any other user-manipulated state.
        reinitView: function() {
                this.ignoreWindowResize++;
                this.freezeContentHeight();

                var viewType = this.view.type;
                var scrollState = this.view.queryScroll();
                this.clearView();
                this.calcSize();
                this.renderView(viewType, scrollState);

                this.thawContentHeight();
                this.ignoreWindowResize--;
        },


        // Resizing
        // -----------------------------------------------------------------------------------


        getSuggestedViewHeight: function() {
                if (this.suggestedViewHeight === null) {
                        this.calcSize();
                }
                return this.suggestedViewHeight;
        },


        isHeightAuto: function() {
                return this.opt('contentHeight') === 'auto' || this.opt('height') === 'auto';
        },


        updateSize: function(shouldRecalc) {
                if (this.elementVisible()) {

                        if (shouldRecalc) {
                                this._calcSize();
                        }

                        this.ignoreWindowResize++;
                        this.view.updateSize(true); // isResize=true. will poll getSuggestedViewHeight() and isHeightAuto()
                        this.ignoreWindowResize--;

                        return true; // signal success
                }
        },


        calcSize: function() {
                if (this.elementVisible()) {
                        this._calcSize();
                }
        },


        _calcSize: function() { // assumes elementVisible
                var contentHeightInput = this.opt('contentHeight');
                var heightInput = this.opt('height');

                if (typeof contentHeightInput === 'number') { // exists and not 'auto'
                        this.suggestedViewHeight = contentHeightInput;
                }
                else if (typeof contentHeightInput === 'function') { // exists and is a function
                        this.suggestedViewHeight = contentHeightInput();
                }
                else if (typeof heightInput === 'number') { // exists and not 'auto'
                        this.suggestedViewHeight = heightInput - this.queryToolbarsHeight();
                }
                else if (typeof heightInput === 'function') { // exists and is a function
                        this.suggestedViewHeight = heightInput() - this.queryToolbarsHeight();
                }
                else if (heightInput === 'parent') { // set to height of parent element
                        this.suggestedViewHeight = this.el.parent().height() - this.queryToolbarsHeight();
                }
                else {
                        this.suggestedViewHeight = Math.round(
                                this.contentEl.width() /
                                Math.max(this.opt('aspectRatio'), .5)
                        );
                }
        },


        windowResize: function(ev) {
                if (
                        !this.ignoreWindowResize &&
                        ev.target === window && // so we don't process jqui "resize" events that have bubbled up
                        this.view.renderUnzonedRange // view has already been rendered
                ) {
                        if (this.updateSize(true)) {
                                this.publiclyTrigger('windowResize', [ this.view ]);
                        }
                }
        },


        /* Height "Freezing"
        -----------------------------------------------------------------------------*/


        freezeContentHeight: function() {
                this.contentEl.css({
                        width: '100%',
                        height: this.contentEl.height(),
                        overflow: 'hidden'
                });
        },


        thawContentHeight: function() {
                this.contentEl.css({
                        width: '',
                        height: '',
                        overflow: ''
                });
        }

});

;;

Calendar.mixin({

        header: null,
        footer: null,
        toolbarsManager: null,


        initToolbars: function() {
                this.header = new Toolbar(this, this.computeHeaderOptions());
                this.footer = new Toolbar(this, this.computeFooterOptions());
                this.toolbarsManager = new Iterator([ this.header, this.footer ]);
        },


        computeHeaderOptions: function() {
                return {
                        extraClasses: 'fc-header-toolbar',
                        layout: this.opt('header')
                };
        },


        computeFooterOptions: function() {
                return {
                        extraClasses: 'fc-footer-toolbar',
                        layout: this.opt('footer')
                };
        },


        // can be called repeatedly and Header will rerender
        renderHeader: function() {
                var header = this.header;

                header.setToolbarOptions(this.computeHeaderOptions());
                header.render();

                if (header.el) {
                        this.el.prepend(header.el);
                }
        },


        // can be called repeatedly and Footer will rerender
        renderFooter: function() {
                var footer = this.footer;

                footer.setToolbarOptions(this.computeFooterOptions());
                footer.render();

                if (footer.el) {
                        this.el.append(footer.el);
                }
        },


        setToolbarsTitle: function(title) {
                this.toolbarsManager.proxyCall('updateTitle', title);
        },


        updateToolbarButtons: function() {
                var now = this.getNow();
                var view = this.view;
                var todayInfo = view.buildDateProfile(now);
                var prevInfo = view.buildPrevDateProfile(this.currentDate);
                var nextInfo = view.buildNextDateProfile(this.currentDate);

                this.toolbarsManager.proxyCall(
                        (todayInfo.isValid && !view.currentUnzonedRange.containsDate(now)) ?
                                'enableButton' :
                                'disableButton',
                        'today'
                );

                this.toolbarsManager.proxyCall(
                        prevInfo.isValid ?
                                'enableButton' :
                                'disableButton',
                        'prev'
                );

                this.toolbarsManager.proxyCall(
                        nextInfo.isValid ?
                                'enableButton' :
                                'disableButton',
                        'next'
                );
        },


        queryToolbarsHeight: function() {
                return this.toolbarsManager.items.reduce(function(accumulator, toolbar) {
                        var toolbarHeight = toolbar.el ? toolbar.el.outerHeight(true) : 0; // includes margin
                        return accumulator + toolbarHeight;
                }, 0);
        }

});

;;

var BUSINESS_HOUR_EVENT_DEFAULTS = {
        start: '09:00',
        end: '17:00',
        dow: [ 1, 2, 3, 4, 5 ], // monday - friday
        rendering: 'inverse-background'
        // classNames are defined in businessHoursSegClasses
};


/*
returns ComponentFootprint[]
`businessHourDef` is optional. Use Calendar's setting if omitted.
*/
Calendar.prototype.buildCurrentBusinessFootprints = function(wholeDay) {
        return this._buildCurrentBusinessFootprints(wholeDay, this.opt('businessHours'));
};


Calendar.prototype._buildCurrentBusinessFootprints = function(wholeDay, businessDefInput) {
        var eventPeriod = this.eventManager.currentPeriod;
        var businessInstanceGroup;

        if (eventPeriod) {
                businessInstanceGroup = this.buildBusinessInstanceGroup(
                        wholeDay,
                        businessDefInput,
                        eventPeriod.unzonedRange
                );

                if (businessInstanceGroup) {
                        return this.eventInstancesToFootprints( // in Calendar.constraints.js
                                businessInstanceGroup.eventInstances
                        );
                }
        }

        return [];
};


/*
If there are business hours, and they are within range, returns populated EventInstanceGroup.
If there are business hours, but they aren't within range, returns a zero-item EventInstanceGroup.
If there are NOT business hours, returns undefined.
*/
Calendar.prototype.buildBusinessInstanceGroup = function(wholeDay, rawComplexDef, unzonedRange) {
        var eventDefs = this.buildBusinessDefs(wholeDay, rawComplexDef);
        var eventInstanceGroup;

        if (eventDefs.length) {
                eventInstanceGroup = new EventInstanceGroup(
                        eventDefsToEventInstances(eventDefs, unzonedRange)
                );

                // so that inverse-background rendering can happen even when no eventRanges in view
                eventInstanceGroup.explicitEventDef = eventDefs[0];

                return eventInstanceGroup;
        }
};


Calendar.prototype.buildBusinessDefs = function(wholeDay, rawComplexDef) {
        var rawDefs = [];
        var requireDow = false;
        var i;
        var defs = [];

        if (rawComplexDef === true) {
                rawDefs = [ {} ]; // will get BUSINESS_HOUR_EVENT_DEFAULTS verbatim
        }
        else if ($.isPlainObject(rawComplexDef)) {
                rawDefs = [ rawComplexDef ];
        }
        else if ($.isArray(rawComplexDef)) {
                rawDefs = rawComplexDef;
                requireDow = true; // every sub-definition NEEDS a day-of-week
        }

        for (i = 0; i < rawDefs.length; i++) {
                if (!requireDow || rawDefs[i].dow) {
                        defs.push(
                                this.buildBusinessDef(wholeDay, rawDefs[i])
                        );
                }
        }

        return defs;
};


Calendar.prototype.buildBusinessDef = function(wholeDay, rawDef) {
        var fullRawDef = $.extend({}, BUSINESS_HOUR_EVENT_DEFAULTS, rawDef);

        if (wholeDay) {
                fullRawDef.start = null;
                fullRawDef.end = null;
        }

        return RecurringEventDef.parse(
                fullRawDef,
                new EventSource(this) // dummy source
        );
};

;;

/*
determines if eventInstanceGroup is allowed,
in relation to other EVENTS and business hours.
*/
Calendar.prototype.isEventInstanceGroupAllowed = function(eventInstanceGroup) {
        var eventDef = eventInstanceGroup.getEventDef();
        var eventFootprints = this.eventRangesToEventFootprints(eventInstanceGroup.getAllEventRanges());
        var i;

        var peerEventInstances = this.getPeerEventInstances(eventDef);
        var peerEventRanges = eventInstancesToEventRanges(peerEventInstances);
        var peerEventFootprints = this.eventRangesToEventFootprints(peerEventRanges);

        var constraintVal = eventDef.getConstraint();
        var overlapVal = eventDef.getOverlap();

        var eventAllowFunc = this.opt('eventAllow');

        for (i = 0; i < eventFootprints.length; i++) {
                if (
                        !this.isFootprintAllowed(
                                eventFootprints[i].componentFootprint,
                                peerEventFootprints,
                                constraintVal,
                                overlapVal,
                                eventFootprints[i].eventInstance
                        )
                ) {
                        return false;
                }
        }

        if (eventAllowFunc) {
                for (i = 0; i < eventFootprints.length; i++) {
                        if (
                                eventAllowFunc(
                                        eventFootprints[i].componentFootprint.toLegacy(this),
                                        eventFootprints[i].getEventLegacy()
                                ) === false
                        ) {
                                return false;
                        }
                }
        }

        return true;
};


Calendar.prototype.getPeerEventInstances = function(eventDef) {
        return this.eventManager.getEventInstancesWithoutId(eventDef.id);
};


Calendar.prototype.isSelectionFootprintAllowed = function(componentFootprint) {
        var peerEventInstances = this.eventManager.getEventInstances();
        var peerEventRanges = eventInstancesToEventRanges(peerEventInstances);
        var peerEventFootprints = this.eventRangesToEventFootprints(peerEventRanges);

        var selectAllowFunc;

        if (
                this.isFootprintAllowed(
                        componentFootprint,
                        peerEventFootprints,
                        this.opt('selectConstraint'),
                        this.opt('selectOverlap')
                )
        ) {
                selectAllowFunc = this.opt('selectAllow');

                if (selectAllowFunc) {
                        return selectAllowFunc(componentFootprint.toLegacy(this)) !== false;
                }
                else {
                        return true;
                }
        }

        return false;
};


Calendar.prototype.isFootprintAllowed = function(
        componentFootprint,
        peerEventFootprints,
        constraintVal,
        overlapVal,
        subjectEventInstance // optional
) {
        var constraintFootprints; // ComponentFootprint[]
        var overlapEventFootprints; // EventFootprint[]

        if (constraintVal != null) {
                constraintFootprints = this.constraintValToFootprints(constraintVal, componentFootprint.isAllDay);

                if (!this.isFootprintWithinConstraints(componentFootprint, constraintFootprints)) {
                        return false;
                }
        }

        overlapEventFootprints = this.collectOverlapEventFootprints(peerEventFootprints, componentFootprint);

        if (overlapVal === false) {
                if (overlapEventFootprints.length) {
                        return false;
                }
        }
        else if (typeof overlapVal === 'function') {
                if (!isOverlapsAllowedByFunc(overlapEventFootprints, overlapVal, subjectEventInstance)) {
                        return false;
                }
        }

        if (subjectEventInstance) {
                if (!isOverlapEventInstancesAllowed(overlapEventFootprints, subjectEventInstance)) {
                        return false;
                }
        }

        return true;
};


// Constraint
// ------------------------------------------------------------------------------------------------


Calendar.prototype.isFootprintWithinConstraints = function(componentFootprint, constraintFootprints) {
        var i;

        for (i = 0; i < constraintFootprints.length; i++) {
                if (this.footprintContainsFootprint(constraintFootprints[i], componentFootprint)) {
                        return true;
                }
        }

        return false;
};


Calendar.prototype.constraintValToFootprints = function(constraintVal, isAllDay) {
        var eventInstances;

        if (constraintVal === 'businessHours') {
                return this.buildCurrentBusinessFootprints(isAllDay);
        }
        else if (typeof constraintVal === 'object') {
                eventInstances = this.parseEventDefToInstances(constraintVal); // handles recurring events

                if (!eventInstances) { // invalid input. fallback to parsing footprint directly
                        return this.parseFootprints(constraintVal);
                }
                else {
                        return this.eventInstancesToFootprints(eventInstances);
                }
        }
        else if (constraintVal != null) { // an ID
                eventInstances = this.eventManager.getEventInstancesWithId(constraintVal);

                return this.eventInstancesToFootprints(eventInstances);
        }
};


// conversion util
Calendar.prototype.eventInstancesToFootprints = function(eventInstances) {
        return eventFootprintsToComponentFootprints(
                this.eventRangesToEventFootprints(
                        eventInstancesToEventRanges(eventInstances)
                )
        );
};


// Overlap
// ------------------------------------------------------------------------------------------------


Calendar.prototype.collectOverlapEventFootprints = function(peerEventFootprints, targetFootprint) {
        var overlapEventFootprints = [];
        var i;

        for (i = 0; i < peerEventFootprints.length; i++) {
                if (
                        this.footprintsIntersect(
                                targetFootprint,
                                peerEventFootprints[i].componentFootprint
                        )
                ) {
                        overlapEventFootprints.push(peerEventFootprints[i]);
                }
        }

        return overlapEventFootprints;
};


// optional subjectEventInstance
function isOverlapsAllowedByFunc(overlapEventFootprints, overlapFunc, subjectEventInstance) {
        var i;

        for (i = 0; i < overlapEventFootprints.length; i++) {
                if (
                        !overlapFunc(
                                overlapEventFootprints[i].eventInstance.toLegacy(),
                                subjectEventInstance ? subjectEventInstance.toLegacy() : null
                        )
                ) {
                        return false;
                }
        }

        return true;
}


function isOverlapEventInstancesAllowed(overlapEventFootprints, subjectEventInstance) {
        var subjectLegacyInstance = subjectEventInstance.toLegacy();
        var i;
        var overlapEventInstance;
        var overlapEventDef;
        var overlapVal;

        for (i = 0; i < overlapEventFootprints.length; i++) {
                overlapEventInstance = overlapEventFootprints[i].eventInstance;
                overlapEventDef = overlapEventInstance.def;

                // don't need to pass in calendar, because don't want to consider global eventOverlap property,
                // because we already considered that earlier in the process.
                overlapVal = overlapEventDef.getOverlap();

                if (overlapVal === false) {
                        return false;
                }
                else if (typeof overlapVal === 'function') {
                        if (
                                !overlapVal(
                                        overlapEventInstance.toLegacy(),
                                        subjectLegacyInstance
                                )
                        ) {
                                return false;
                        }
                }
        }

        return true;
}


// Conversion: eventDefs -> eventInstances -> eventRanges -> eventFootprints -> componentFootprints
// ------------------------------------------------------------------------------------------------
// NOTE: this might seem like repetitive code with the Grid class, however, this code is related to
// constraints whereas the Grid code is related to rendering. Each approach might want to convert
// eventRanges -> eventFootprints in a different way. Regardless, there are opportunities to make
// this more DRY.


/*
Returns false on invalid input.
*/
Calendar.prototype.parseEventDefToInstances = function(eventInput) {
        var eventPeriod = this.eventManager.currentPeriod;
        var eventDef = EventDefParser.parse(eventInput, new EventSource(this));

        if (!eventDef) { // invalid
                return false;
        }

        if (eventPeriod) {
                return eventDef.buildInstances(eventPeriod.unzonedRange);
        }
        else {
                return [];
        }
};


Calendar.prototype.eventRangesToEventFootprints = function(eventRanges) {
        var i;
        var eventFootprints = [];

        for (i = 0; i < eventRanges.length; i++) {
                eventFootprints.push.apply(eventFootprints, // append
                        this.eventRangeToEventFootprints(eventRanges[i])
                );
        }

        return eventFootprints;
};


/*
TODO: somehow more DRY with Grid::eventRangeToEventFootprints
*/
Calendar.prototype.eventRangeToEventFootprints = function(eventRange) {
        return [
                new EventFootprint(
                        new ComponentFootprint(
                                eventRange.unzonedRange,
                                eventRange.eventDef.isAllDay()
                        ),
                        eventRange.eventDef,
                        eventRange.eventInstance // might not exist
                )
        ];
};


/*
Parses footprints directly.
Very similar to EventDateProfile::parse :(
*/
Calendar.prototype.parseFootprints = function(rawInput) {
        var start, end;

        if (rawInput.start) {
                start = this.moment(rawInput.start);

                if (!start.isValid()) {
                        start = null;
                }
        }

        if (rawInput.end) {
                end = this.moment(rawInput.end);

                if (!end.isValid()) {
                        end = null;
                }
        }

        return [
                new ComponentFootprint(
                        new UnzonedRange(start, end),
                        (start && !start.hasTime()) || (end && !end.hasTime()) // isAllDay
                )
        ];
};


// Footprint Utils
// ----------------------------------------------------------------------------------------


Calendar.prototype.footprintContainsFootprint = function(outerFootprint, innerFootprint) {
        return outerFootprint.unzonedRange.containsRange(innerFootprint.unzonedRange);
};


Calendar.prototype.footprintsIntersect = function(footprint0, footprint1) {
        return footprint0.unzonedRange.intersectsWith(footprint1.unzonedRange);
};

;;

Calendar.mixin({

        // Sources
        // ------------------------------------------------------------------------------------


        getEventSources: function() {
                return this.eventManager.otherSources.slice(); // clone
        },


        getEventSourceById: function(id) {
                return this.eventManager.getSourceById(
                        EventSource.normalizeId(id)
                );
        },


        addEventSource: function(sourceInput) {
                var source = EventSourceParser.parse(sourceInput, this);

                if (source) {
                        this.eventManager.addSource(source);
                }
        },


        removeEventSources: function(sourceMultiQuery) {
                var eventManager = this.eventManager;
                var sources;
                var i;

                if (sourceMultiQuery == null) {
                        this.eventManager.removeAllSources();
                }
                else {
                        sources = eventManager.multiQuerySources(sourceMultiQuery);

                        eventManager.freeze();

                        for (i = 0; i < sources.length; i++) {
                                eventManager.removeSource(sources[i]);
                        }

                        eventManager.thaw();
                }
        },


        removeEventSource: function(sourceQuery) {
                var eventManager = this.eventManager;
                var sources = eventManager.querySources(sourceQuery);
                var i;

                eventManager.freeze();

                for (i = 0; i < sources.length; i++) {
                        eventManager.removeSource(sources[i]);
                }

                eventManager.thaw();
        },


        refetchEventSources: function(sourceMultiQuery) {
                var eventManager = this.eventManager;
                var sources = eventManager.multiQuerySources(sourceMultiQuery);
                var i;

                eventManager.freeze();

                for (i = 0; i < sources.length; i++) {
                        eventManager.refetchSource(sources[i]);
                }

                eventManager.thaw();
        },


        // Events
        // ------------------------------------------------------------------------------------


        refetchEvents: function() {
                this.eventManager.refetchAllSources();
        },


        renderEvents: function(eventInputs, isSticky) {
                this.eventManager.freeze();

                for (var i = 0; i < eventInputs.length; i++) {
                        this.renderEvent(eventInputs[i], isSticky);
                }

                this.eventManager.thaw();
        },


        renderEvent: function(eventInput, isSticky) {
                var eventManager = this.eventManager;
                var eventDef = EventDefParser.parse(
                        eventInput,
                        eventInput.source || eventManager.stickySource
                );

                if (eventDef) {
                        eventManager.addEventDef(eventDef, isSticky);
                }
        },


        // legacyQuery operates on legacy event instance objects
        removeEvents: function(legacyQuery) {
                var eventManager = this.eventManager;
                var eventInstances = eventManager.getEventInstances();
                var legacyInstances;
                var idMap = {};
                var eventDef;
                var i;

                if (legacyQuery == null) { // shortcut for removing all
                        eventManager.removeAllEventDefs();
                }
                else {
                        legacyInstances = eventInstances.map(function(eventInstance) {
                                return eventInstance.toLegacy();
                        });

                        legacyInstances = filterLegacyEventInstances(legacyInstances, legacyQuery);

                        // compute unique IDs
                        for (i = 0; i < legacyInstances.length; i++) {
                                eventDef = this.eventManager.getEventDefByUid(legacyInstances[i]._id);
                                idMap[eventDef.id] = true;
                        }

                        eventManager.freeze();

                        for (i in idMap) { // reuse `i` as an "id"
                                eventManager.removeEventDefsById(i);
                        }

                        eventManager.thaw();
                }
        },


        // legacyQuery operates on legacy event instance objects
        clientEvents: function(legacyQuery) {
                var eventInstances = this.eventManager.getEventInstances();
                var legacyEventInstances = eventInstances.map(function(eventInstance) {
                        return eventInstance.toLegacy();
                });

                return filterLegacyEventInstances(legacyEventInstances, legacyQuery);
        },


        updateEvents: function(eventPropsArray) {
                this.eventManager.freeze();

                for (var i = 0; i < eventPropsArray.length; i++) {
                        this.updateEvent(eventPropsArray[i]);
                }

                this.eventManager.thaw();
        },


        updateEvent: function(eventProps) {
                var eventDef = this.eventManager.getEventDefByUid(eventProps._id);
                var eventInstance;
                var eventDefMutation;

                if (eventDef instanceof SingleEventDef) {
                        eventInstance = eventDef.buildInstance();

                        eventDefMutation = EventDefMutation.createFromRawProps(
                                eventInstance,
                                eventProps, // raw props
                                null // largeUnit -- who uses it?
                        );

                        this.eventManager.mutateEventsWithId(eventDef.id, eventDefMutation); // will release
                }
        }

});


function filterLegacyEventInstances(legacyEventInstances, legacyQuery) {
        if (legacyQuery == null) {
                return legacyEventInstances;
        }
        else if ($.isFunction(legacyQuery)) {
                return legacyEventInstances.filter(legacyQuery);
        }
        else { // an event ID
                legacyQuery += ''; // normalize to string

                return legacyEventInstances.filter(function(legacyEventInstance) {
                        // soft comparison because id not be normalized to string
                        return legacyEventInstance.id == legacyQuery;
                });
        }
}

;;

Calendar.defaults = {

        titleRangeSeparator: ' \u2013 ', // en dash
        monthYearFormat: 'MMMM YYYY', // required for en. other locales rely on datepicker computable option

        defaultTimedEventDuration: '02:00:00',
        defaultAllDayEventDuration: { days: 1 },
        forceEventDuration: false,
        nextDayThreshold: '09:00:00', // 9am

        // display
        defaultView: 'month',
        aspectRatio: 1.35,
        header: {
                left: 'title',
                center: '',
                right: 'today prev,next'
        },
        weekends: true,
        weekNumbers: false,

        weekNumberTitle: 'W',
        weekNumberCalculation: 'local',
        
        //editable: false,

        //nowIndicator: false,

        scrollTime: '06:00:00',
        minTime: '00:00:00',
        maxTime: '24:00:00',
        showNonCurrentDates: true,
        
        // event ajax
        lazyFetching: true,
        startParam: 'start',
        endParam: 'end',
        timezoneParam: 'timezone',

        timezone: false,

        //allDayDefault: undefined,

        // locale
        isRTL: false,
        buttonText: {
                prev: "prev",
                next: "next",
                prevYear: "prev year",
                nextYear: "next year",
                year: 'year', // TODO: locale files need to specify this
                today: 'today',
                month: 'month',
                week: 'week',
                day: 'day'
        },
        //buttonIcons: null,

        allDayText: 'all-day',
        
        // jquery-ui theming
        theme: false,
        //themeButtonIcons: null,

        //eventResizableFromStart: false,
        dragOpacity: .75,
        dragRevertDuration: 500,
        dragScroll: true,
        
        //selectable: false,
        unselectAuto: true,
        //selectMinDistance: 0,
        
        dropAccept: '*',

        eventOrder: 'title',
        //eventRenderWait: null,

        eventLimit: false,
        eventLimitText: 'more',
        eventLimitClick: 'popover',
        dayPopoverFormat: 'LL',
        
        handleWindowResize: true,
        windowResizeDelay: 100, // milliseconds before an updateSize happens

        longPressDelay: 1000
        
};


Calendar.englishDefaults = { // used by locale.js
        dayPopoverFormat: 'dddd, MMMM D'
};


Calendar.rtlDefaults = { // right-to-left defaults
        header: { // TODO: smarter solution (first/center/last ?)
                left: 'next,prev today',
                center: '',
                right: 'title'
        },
        buttonIcons: {
                prev: 'right-single-arrow',
                next: 'left-single-arrow',
                prevYear: 'right-double-arrow',
                nextYear: 'left-double-arrow'
        },
        themeButtonIcons: {
                prev: 'circle-triangle-e',
                next: 'circle-triangle-w',
                nextYear: 'seek-prev',
                prevYear: 'seek-next'
        }
};

;;

var localeOptionHash = FC.locales = {}; // initialize and expose


// TODO: document the structure and ordering of a FullCalendar locale file


// Initialize jQuery UI datepicker translations while using some of the translations
// Will set this as the default locales for datepicker.
FC.datepickerLocale = function(localeCode, dpLocaleCode, dpOptions) {

        // get the FullCalendar internal option hash for this locale. create if necessary
        var fcOptions = localeOptionHash[localeCode] || (localeOptionHash[localeCode] = {});

        // transfer some simple options from datepicker to fc
        fcOptions.isRTL = dpOptions.isRTL;
        fcOptions.weekNumberTitle = dpOptions.weekHeader;

        // compute some more complex options from datepicker
        $.each(dpComputableOptions, function(name, func) {
                fcOptions[name] = func(dpOptions);
        });

        // is jQuery UI Datepicker is on the page?
        if ($.datepicker) {

                // Register the locale data.
                // FullCalendar and MomentJS use locale codes like "pt-br" but Datepicker
                // does it like "pt-BR" or if it doesn't have the locale, maybe just "pt".
                // Make an alias so the locale can be referenced either way.
                $.datepicker.regional[dpLocaleCode] =
                        $.datepicker.regional[localeCode] = // alias
                                dpOptions;

                // Alias 'en' to the default locale data. Do this every time.
                $.datepicker.regional.en = $.datepicker.regional[''];

                // Set as Datepicker's global defaults.
                $.datepicker.setDefaults(dpOptions);
        }
};


// Sets FullCalendar-specific translations. Will set the locales as the global default.
FC.locale = function(localeCode, newFcOptions) {
        var fcOptions;
        var momOptions;

        // get the FullCalendar internal option hash for this locale. create if necessary
        fcOptions = localeOptionHash[localeCode] || (localeOptionHash[localeCode] = {});

        // provided new options for this locales? merge them in
        if (newFcOptions) {
                fcOptions = localeOptionHash[localeCode] = mergeOptions([ fcOptions, newFcOptions ]);
        }

        // compute locale options that weren't defined.
        // always do this. newFcOptions can be undefined when initializing from i18n file,
        // so no way to tell if this is an initialization or a default-setting.
        momOptions = getMomentLocaleData(localeCode); // will fall back to en
        $.each(momComputableOptions, function(name, func) {
                if (fcOptions[name] == null) {
                        fcOptions[name] = func(momOptions, fcOptions);
                }
        });

        // set it as the default locale for FullCalendar
        Calendar.defaults.locale = localeCode;
};


// NOTE: can't guarantee any of these computations will run because not every locale has datepicker
// configs, so make sure there are English fallbacks for these in the defaults file.
var dpComputableOptions = {

        buttonText: function(dpOptions) {
                return {
                        // the translations sometimes wrongly contain HTML entities
                        prev: stripHtmlEntities(dpOptions.prevText),
                        next: stripHtmlEntities(dpOptions.nextText),
                        today: stripHtmlEntities(dpOptions.currentText)
                };
        },

        // Produces format strings like "MMMM YYYY" -> "September 2014"
        monthYearFormat: function(dpOptions) {
                return dpOptions.showMonthAfterYear ?
                        'YYYY[' + dpOptions.yearSuffix + '] MMMM' :
                        'MMMM YYYY[' + dpOptions.yearSuffix + ']';
        }

};

var momComputableOptions = {

        // Produces format strings like "ddd M/D" -> "Fri 9/15"
        dayOfMonthFormat: function(momOptions, fcOptions) {
                var format = momOptions.longDateFormat('l'); // for the format like "M/D/YYYY"

                // strip the year off the edge, as well as other misc non-whitespace chars
                format = format.replace(/^Y+[^\w\s]*|[^\w\s]*Y+$/g, '');

                if (fcOptions.isRTL) {
                        format += ' ddd'; // for RTL, add day-of-week to end
                }
                else {
                        format = 'ddd ' + format; // for LTR, add day-of-week to beginning
                }
                return format;
        },

        // Produces format strings like "h:mma" -> "6:00pm"
        mediumTimeFormat: function(momOptions) { // can't be called `timeFormat` because collides with option
                return momOptions.longDateFormat('LT')
                        .replace(/\s*a$/i, 'a'); // convert AM/PM/am/pm to lowercase. remove any spaces beforehand
        },

        // Produces format strings like "h(:mm)a" -> "6pm" / "6:30pm"
        smallTimeFormat: function(momOptions) {
                return momOptions.longDateFormat('LT')
                        .replace(':mm', '(:mm)')
                        .replace(/(\Wmm)$/, '($1)') // like above, but for foreign locales
                        .replace(/\s*a$/i, 'a'); // convert AM/PM/am/pm to lowercase. remove any spaces beforehand
        },

        // Produces format strings like "h(:mm)t" -> "6p" / "6:30p"
        extraSmallTimeFormat: function(momOptions) {
                return momOptions.longDateFormat('LT')
                        .replace(':mm', '(:mm)')
                        .replace(/(\Wmm)$/, '($1)') // like above, but for foreign locales
                        .replace(/\s*a$/i, 't'); // convert to AM/PM/am/pm to lowercase one-letter. remove any spaces beforehand
        },

        // Produces format strings like "ha" / "H" -> "6pm" / "18"
        hourFormat: function(momOptions) {
                return momOptions.longDateFormat('LT')
                        .replace(':mm', '')
                        .replace(/(\Wmm)$/, '') // like above, but for foreign locales
                        .replace(/\s*a$/i, 'a'); // convert AM/PM/am/pm to lowercase. remove any spaces beforehand
        },

        // Produces format strings like "h:mm" -> "6:30" (with no AM/PM)
        noMeridiemTimeFormat: function(momOptions) {
                return momOptions.longDateFormat('LT')
                        .replace(/\s*a$/i, ''); // remove trailing AM/PM
        }

};


// options that should be computed off live calendar options (considers override options)
// TODO: best place for this? related to locale?
// TODO: flipping text based on isRTL is a bad idea because the CSS `direction` might want to handle it
var instanceComputableOptions = {

        // Produces format strings for results like "Mo 16"
        smallDayDateFormat: function(options) {
                return options.isRTL ?
                        'D dd' :
                        'dd D';
        },

        // Produces format strings for results like "Wk 5"
        weekFormat: function(options) {
                return options.isRTL ?
                        'w[ ' + options.weekNumberTitle + ']' :
                        '[' + options.weekNumberTitle + ' ]w';
        },

        // Produces format strings for results like "Wk5"
        smallWeekFormat: function(options) {
                return options.isRTL ?
                        'w[' + options.weekNumberTitle + ']' :
                        '[' + options.weekNumberTitle + ']w';
        }

};

// TODO: make these computable properties in optionsModel
function populateInstanceComputableOptions(options) {
        $.each(instanceComputableOptions, function(name, func) {
                if (options[name] == null) {
                        options[name] = func(options);
                }
        });
}


// Returns moment's internal locale data. If doesn't exist, returns English.
function getMomentLocaleData(localeCode) {
        return moment.localeData(localeCode) || moment.localeData('en');
}


// Initialize English by forcing computation of moment-derived options.
// Also, sets it as the default.
FC.locale('en', Calendar.englishDefaults);

;;

var UnzonedRange = FC.UnzonedRange = Class.extend({

        startMs: null, // if null, no start constraint
        endMs: null, // if null, no end constraint

        // TODO: move these into footprint.
        // Especially, doesn't make sense for null startMs/endMs.
        isStart: true,
        isEnd: true,

        constructor: function(startInput, endInput) {

                if (moment.isMoment(startInput)) {
                        startInput = startInput.clone().stripZone();
                }

                if (moment.isMoment(endInput)) {
                        endInput = endInput.clone().stripZone();
                }

                if (startInput) {
                        this.startMs = startInput.valueOf();
                }

                if (endInput) {
                        this.endMs = endInput.valueOf();
                }
        },

        intersect: function(otherRange) {
                var startMs = this.startMs;
                var endMs = this.endMs;
                var newRange = null;

                if (otherRange.startMs !== null) {
                        if (startMs === null) {
                                startMs = otherRange.startMs;
                        }
                        else {
                                startMs = Math.max(startMs, otherRange.startMs);
                        }
                }

                if (otherRange.endMs !== null) {
                        if (endMs === null) {
                                endMs = otherRange.endMs;
                        }
                        else {
                                endMs = Math.min(endMs, otherRange.endMs);
                        }
                }

                if (startMs === null || endMs === null || startMs < endMs) {
                        newRange = new UnzonedRange(startMs, endMs);
                        newRange.isStart = this.isStart && startMs === this.startMs;
                        newRange.isEnd = this.isEnd && endMs === this.endMs;
                }

                return newRange;
        },


        intersectsWith: function(otherRange) {
                return (this.endMs === null || otherRange.startMs === null || this.endMs > otherRange.startMs) &&
                        (this.startMs === null || otherRange.endMs === null || this.startMs < otherRange.endMs);
        },


        containsRange: function(innerRange) {
                return (this.startMs === null || (innerRange.startMs !== null && innerRange.startMs >= this.startMs)) &&
                        (this.endMs === null || (innerRange.endMs !== null && innerRange.endMs <= this.endMs));
        },


        // `date` can be a moment, a Date, or a millisecond time.
        containsDate: function(date) {
                var ms = date.valueOf();

                return (this.startMs === null || ms >= this.startMs) &&
                        (this.endMs === null || ms < this.endMs);
        },


        // If the given date is not within the given range, move it inside.
        // (If it's past the end, make it one millisecond before the end).
        // `date` can be a moment, a Date, or a millisecond time.
        // Returns a MS-time.
        constrainDate: function(date) {
                var ms = date.valueOf();

                if (this.startMs !== null && ms < this.startMs) {
                        ms = this.startMs;
                }

                if (this.endMs !== null && ms >= this.endMs) {
                        ms = this.endMs - 1;
                }

                return ms;
        },


        equals: function(otherRange) {
                return this.startMs === otherRange.startMs && this.endMs === otherRange.endMs;
        },


        clone: function() {
                var range = new UnzonedRange(this.startMs, this.endMs);

                range.isStart = this.isStart;
                range.isEnd = this.isEnd;

                return range;
        },


        // Returns an ambig-zoned moment from startMs.
        // BEWARE: returned moment is not localized.
        // Formatting and start-of-week will be default.
        getStart: function() {
                if (this.startMs !== null) {
                        return FC.moment.utc(this.startMs).stripZone();
                }
        },

        // Returns an ambig-zoned moment from startMs.
        // BEWARE: returned moment is not localized.
        // Formatting and start-of-week will be default.
        getEnd: function() {
                if (this.endMs !== null) {
                        return FC.moment.utc(this.endMs).stripZone();
                }
        }

});


/*
SIDEEFFECT: will mutate eventRanges.
Will return a new array result.
Only works for non-open-ended ranges.
*/
function invertUnzonedRanges(ranges, constraintRange) {
        var invertedRanges = [];
        var startMs = constraintRange.startMs; // the end of the previous range. the start of the new range
        var i;
        var dateRange;

        // ranges need to be in order. required for our date-walking algorithm
        ranges.sort(compareUnzonedRanges);

        for (i = 0; i < ranges.length; i++) {
                dateRange = ranges[i];

                // add the span of time before the event (if there is any)
                if (dateRange.startMs > startMs) { // compare millisecond time (skip any ambig logic)
                        invertedRanges.push(
                                new UnzonedRange(startMs, dateRange.startMs)
                        );
                }

                if (dateRange.endMs > startMs) {
                        startMs = dateRange.endMs;
                }
        }

        // add the span of time after the last event (if there is any)
        if (startMs < constraintRange.endMs) { // compare millisecond time (skip any ambig logic)
                invertedRanges.push(
                        new UnzonedRange(startMs, constraintRange.endMs)
                );
        }

        return invertedRanges;
}


/*
Only works for non-open-ended ranges.
*/
function compareUnzonedRanges(range1, range2) {
        return range1.startMs - range2.startMs; // earlier ranges go first
}

;;

/*
Meant to be immutable
*/
var ComponentFootprint = FC.ComponentFootprint = Class.extend({

        unzonedRange: null,
        isAllDay: false, // component can choose to ignore this


        constructor: function(unzonedRange, isAllDay) {
                this.unzonedRange = unzonedRange;
                this.isAllDay = isAllDay;
        },


        /*
        Only works for non-open-ended ranges.
        */
        toLegacy: function(calendar) {
                return {
                        start: calendar.msToMoment(this.unzonedRange.startMs, this.isAllDay),
                        end: calendar.msToMoment(this.unzonedRange.endMs, this.isAllDay)
                };
        }

});

;;

var EventManager = Class.extend(EmitterMixin, ListenerMixin, {

        currentPeriod: null,

        calendar: null,
        stickySource: null,
        otherSources: null, // does not include sticky source


        constructor: function(calendar) {
                this.calendar = calendar;
                this.stickySource = new ArrayEventSource(calendar);
                this.otherSources = [];
        },


        requestEvents: function(start, end, timezone, force) {
                if (
                        force ||
                        !this.currentPeriod ||
                        !this.currentPeriod.isWithinRange(start, end) ||
                        timezone !== this.currentPeriod.timezone
                ) {
                        this.setPeriod( // will change this.currentPeriod
                                new EventPeriod(start, end, timezone)
                        );
                }

                return this.currentPeriod.whenReleased();
        },


        // Source Adding/Removing
        // -----------------------------------------------------------------------------------------------------------------


        addSource: function(eventSource) {
                this.otherSources.push(eventSource);

                if (this.currentPeriod) {
                        this.currentPeriod.requestSource(eventSource); // might release
                }
        },


        removeSource: function(doomedSource) {
                removeExact(this.otherSources, doomedSource);

                if (this.currentPeriod) {
                        this.currentPeriod.purgeSource(doomedSource); // might release
                }
        },


        removeAllSources: function() {
                this.otherSources = [];

                if (this.currentPeriod) {
                        this.currentPeriod.purgeAllSources(); // might release
                }
        },


        // Source Refetching
        // -----------------------------------------------------------------------------------------------------------------


        refetchSource: function(eventSource) {
                var currentPeriod = this.currentPeriod;

                if (currentPeriod) {
                        currentPeriod.freeze();
                        currentPeriod.purgeSource(eventSource);
                        currentPeriod.requestSource(eventSource);
                        currentPeriod.thaw();
                }
        },


        refetchAllSources: function() {
                var currentPeriod = this.currentPeriod;

                if (currentPeriod) {
                        currentPeriod.freeze();
                        currentPeriod.purgeAllSources();
                        currentPeriod.requestSources(this.getSources());
                        currentPeriod.thaw();
                }
        },


        // Source Querying
        // -----------------------------------------------------------------------------------------------------------------


        getSources: function() {
                return [ this.stickySource ].concat(this.otherSources);
        },


        // like querySources, but accepts multple match criteria (like multiple IDs)
        multiQuerySources: function(matchInputs) {

                // coerce into an array
                if (!matchInputs) {
                        matchInputs = [];
                }
                else if (!$.isArray(matchInputs)) {
                        matchInputs = [ matchInputs ];
                }

                var matchingSources = [];
                var i;

                // resolve raw inputs to real event source objects
                for (i = 0; i < matchInputs.length; i++) {
                        matchingSources.push.apply( // append
                                matchingSources,
                                this.querySources(matchInputs[i])
                        );
                }

                return matchingSources;
        },


        // matchInput can either by a real event source object, an ID, or the function/URL for the source.
        // returns an array of matching source objects.
        querySources: function(matchInput) {
                var sources = this.otherSources;
                var i, source;

                // given a proper event source object
                for (i = 0; i < sources.length; i++) {
                        source = sources[i];

                        if (source === matchInput) {
                                return [ source ];
                        }
                }

                // an ID match
                source = this.getSourceById(EventSource.normalizeId(matchInput));
                if (source) {
                        return [ source ];
                }

                // parse as an event source
                matchInput = EventSourceParser.parse(matchInput, this.calendar);
                if (matchInput) {

                        return $.grep(sources, function(source) {
                                return isSourcesEquivalent(matchInput, source);
                        });
                }
        },


        /*
        ID assumed to already be normalized
        */
        getSourceById: function(id) {
                return $.grep(this.otherSources, function(source) {
                        return source.id && source.id === id;
                })[0];
        },


        // Event-Period
        // -----------------------------------------------------------------------------------------------------------------


        setPeriod: function(eventPeriod) {
                if (this.currentPeriod) {
                        this.unbindPeriod(this.currentPeriod);
                        this.currentPeriod = null;
                }

                this.currentPeriod = eventPeriod;
                this.bindPeriod(eventPeriod);

                eventPeriod.requestSources(this.getSources());
        },


        bindPeriod: function(eventPeriod) {
                this.listenTo(eventPeriod, 'release', function(eventsPayload) {
                        this.trigger('release', eventsPayload);
                });
        },


        unbindPeriod: function(eventPeriod) {
                this.stopListeningTo(eventPeriod);
        },


        // Event Getting/Adding/Removing
        // -----------------------------------------------------------------------------------------------------------------


        getEventDefByUid: function(uid) {
                if (this.currentPeriod) {
                        return this.currentPeriod.getEventDefByUid(uid);
                }
        },


        addEventDef: function(eventDef, isSticky) {
                if (isSticky) {
                        this.stickySource.addEventDef(eventDef);
                }

                if (this.currentPeriod) {
                        this.currentPeriod.addEventDef(eventDef); // might release
                }
        },


        removeEventDefsById: function(eventId) {
                this.getSources().forEach(function(eventSource) {
                        eventSource.removeEventDefsById(eventId);
                });

                if (this.currentPeriod) {
                        this.currentPeriod.removeEventDefsById(eventId); // might release
                }
        },


        removeAllEventDefs: function() {
                this.getSources().forEach(function(eventSource) {
                        eventSource.removeAllEventDefs();
                });

                if (this.currentPeriod) {
                        this.currentPeriod.removeAllEventDefs();
                }
        },


        // Event Mutating
        // -----------------------------------------------------------------------------------------------------------------


        /*
        Returns an undo function.
        */
        mutateEventsWithId: function(eventDefId, eventDefMutation) {
                var currentPeriod = this.currentPeriod;
                var eventDefs;
                var undoFuncs = [];

                if (currentPeriod) {

                        currentPeriod.freeze();

                        eventDefs = currentPeriod.getEventDefsById(eventDefId);
                        eventDefs.forEach(function(eventDef) {
                                // add/remove esp because id might change
                                currentPeriod.removeEventDef(eventDef);
                                undoFuncs.push(eventDefMutation.mutateSingle(eventDef));
                                currentPeriod.addEventDef(eventDef);
                        });

                        currentPeriod.thaw();

                        return function() {
                                currentPeriod.freeze();

                                for (var i = 0; i < eventDefs.length; i++) {
                                        currentPeriod.removeEventDef(eventDefs[i]);
                                        undoFuncs[i]();
                                        currentPeriod.addEventDef(eventDefs[i]);
                                }

                                currentPeriod.thaw();
                        };
                }

                return function() { };
        },


        /*
        copies and then mutates
        */
        buildMutatedEventInstanceGroup: function(eventDefId, eventDefMutation) {
                var eventDefs = this.getEventDefsById(eventDefId);
                var i;
                var defCopy;
                var allInstances = [];

                for (i = 0; i < eventDefs.length; i++) {
                        defCopy = eventDefs[i].clone();

                        if (defCopy instanceof SingleEventDef) {
                                eventDefMutation.mutateSingle(defCopy);

                                allInstances.push.apply(allInstances, // append
                                        defCopy.buildInstances()
                                );
                        }
                }

                return new EventInstanceGroup(allInstances);
        },


        // Freezing
        // -----------------------------------------------------------------------------------------------------------------


        freeze: function() {
                if (this.currentPeriod) {
                        this.currentPeriod.freeze();
                }
        },


        thaw: function() {
                if (this.currentPeriod) {
                        this.currentPeriod.thaw();
                }
        }

});


// Methods that straight-up query the current EventPeriod for an array of results.
[
        'getEventDefsById',
        'getEventInstances',
        'getEventInstancesWithId',
        'getEventInstancesWithoutId'
].forEach(function(methodName) {

        EventManager.prototype[methodName] = function() {
                var currentPeriod = this.currentPeriod;

                if (currentPeriod) {
                        return currentPeriod[methodName].apply(currentPeriod, arguments);
                }

                return [];
        };
});


function isSourcesEquivalent(source0, source1) {
        return source0.getPrimitive() == source1.getPrimitive();
}

;;

var EventPeriod = Class.extend(EmitterMixin, {

        start: null,
        end: null,
        timezone: null,

        unzonedRange: null,

        requestsByUid: null,
        pendingCnt: 0,

        freezeDepth: 0,
        stuntedReleaseCnt: 0,
        releaseCnt: 0,

        eventDefsByUid: null,
        eventDefsById: null,
        eventInstanceGroupsById: null,


        constructor: function(start, end, timezone) {
                this.start = start;
                this.end = end;
                this.timezone = timezone;

                this.unzonedRange = new UnzonedRange(
                        start.clone().stripZone(),
                        end.clone().stripZone()
                );

                this.requestsByUid = {};
                this.eventDefsByUid = {};
                this.eventDefsById = {};
                this.eventInstanceGroupsById = {};
        },


        isWithinRange: function(start, end) {
                // TODO: use a range util function?
                return !start.isBefore(this.start) && !end.isAfter(this.end);
        },


        // Requesting and Purging
        // -----------------------------------------------------------------------------------------------------------------


        requestSources: function(sources) {
                this.freeze();

                for (var i = 0; i < sources.length; i++) {
                        this.requestSource(sources[i]);
                }

                this.thaw();
        },


        requestSource: function(source) {
                var _this = this;
                var request = { source: source, status: 'pending' };

                this.requestsByUid[source.uid] = request;
                this.pendingCnt += 1;

                source.fetch(this.start, this.end, this.timezone).then(function(eventDefs) {
                        if (request.status !== 'cancelled') {
                                request.status = 'completed';
                                request.eventDefs = eventDefs;

                                _this.addEventDefs(eventDefs);
                                _this.pendingCnt--;
                                _this.tryRelease();
                        }
                }, function() { // failure
                        if (request.status !== 'cancelled') {
                                request.status = 'failed';

                                _this.pendingCnt--;
                                _this.tryRelease();
                        }
                });
        },


        purgeSource: function(source) {
                var request = this.requestsByUid[source.uid];

                if (request) {
                        delete this.requestsByUid[source.uid];

                        if (request.status === 'pending') {
                                request.status = 'cancelled';
                                this.pendingCnt--;
                                this.tryRelease();
                        }
                        else if (request.status === 'completed') {
                                request.eventDefs.forEach(this.removeEventDef.bind(this));
                        }
                }
        },


        purgeAllSources: function() {
                var requestsByUid = this.requestsByUid;
                var uid, request;
                var completedCnt = 0;

                for (uid in requestsByUid) {
                        request = requestsByUid[uid];

                        if (request.status === 'pending') {
                                request.status = 'cancelled';
                        }
                        else if (request.status === 'completed') {
                                completedCnt++;
                        }
                }

                this.requestsByUid = {};
                this.pendingCnt = 0;

                if (completedCnt) {
                        this.removeAllEventDefs(); // might release
                }
        },


        // Event Definitions
        // -----------------------------------------------------------------------------------------------------------------


        getEventDefByUid: function(eventDefUid) {
                return this.eventDefsByUid[eventDefUid];
        },


        getEventDefsById: function(eventDefId) {
                var a = this.eventDefsById[eventDefId];

                if (a) {
                        return a.slice(); // clone
                }

                return [];
        },


        addEventDefs: function(eventDefs) {
                for (var i = 0; i < eventDefs.length; i++) {
                        this.addEventDef(eventDefs[i]);
                }
        },


        addEventDef: function(eventDef) {
                var eventDefsById = this.eventDefsById;
                var eventDefId = eventDef.id;
                var eventDefs = eventDefsById[eventDefId] || (eventDefsById[eventDefId] = []);
                var eventInstances = eventDef.buildInstances(this.unzonedRange);
                var i;

                eventDefs.push(eventDef);

                this.eventDefsByUid[eventDef.uid] = eventDef;

                for (i = 0; i < eventInstances.length; i++) {
                        this.addEventInstance(eventInstances[i], eventDefId);
                }
        },


        removeEventDefsById: function(eventDefId) {
                var _this = this;

                this.getEventDefsById(eventDefId).forEach(function(eventDef) {
                        _this.removeEventDef(eventDef);
                });
        },


        removeAllEventDefs: function() {
                var isEmpty = $.isEmptyObject(this.eventDefsByUid);

                this.eventDefsByUid = {};
                this.eventDefsById = {};
                this.eventInstanceGroupsById = {};

                if (!isEmpty) {
                        this.tryRelease();
                }
        },


        removeEventDef: function(eventDef) {
                var eventDefsById = this.eventDefsById;
                var eventDefs = eventDefsById[eventDef.id];

                delete this.eventDefsByUid[eventDef.uid];

                if (eventDefs) {
                        removeExact(eventDefs, eventDef);

                        if (!eventDefs.length) {
                                delete eventDefsById[eventDef.id];
                        }

                        this.removeEventInstancesForDef(eventDef);
                }
        },


        // Event Instances
        // -----------------------------------------------------------------------------------------------------------------


        getEventInstances: function() { // TODO: consider iterator
                var eventInstanceGroupsById = this.eventInstanceGroupsById;
                var eventInstances = [];
                var id;

                for (id in eventInstanceGroupsById) {
                        eventInstances.push.apply(eventInstances, // append
                                eventInstanceGroupsById[id].eventInstances
                        );
                }

                return eventInstances;
        },


        getEventInstancesWithId: function(eventDefId) {
                var eventInstanceGroup = this.eventInstanceGroupsById[eventDefId];

                if (eventInstanceGroup) {
                        return eventInstanceGroup.eventInstances.slice(); // clone
                }

                return [];
        },


        getEventInstancesWithoutId: function(eventDefId) { // TODO: consider iterator
                var eventInstanceGroupsById = this.eventInstanceGroupsById;
                var matchingInstances = [];
                var id;

                for (id in eventInstanceGroupsById) {
                        if (id !== eventDefId) {
                                matchingInstances.push.apply(matchingInstances, // append
                                        eventInstanceGroupsById[id].eventInstances
                                );
                        }
                }

                return matchingInstances;
        },


        addEventInstance: function(eventInstance, eventDefId) {
                var eventInstanceGroupsById = this.eventInstanceGroupsById;
                var eventInstanceGroup = eventInstanceGroupsById[eventDefId] ||
                        (eventInstanceGroupsById[eventDefId] = new EventInstanceGroup());

                eventInstanceGroup.eventInstances.push(eventInstance);

                this.tryRelease();
        },


        removeEventInstancesForDef: function(eventDef) {
                var eventInstanceGroupsById = this.eventInstanceGroupsById;
                var eventInstanceGroup = eventInstanceGroupsById[eventDef.id];
                var removeCnt;

                if (eventInstanceGroup) {
                        removeCnt = removeMatching(eventInstanceGroup.eventInstances, function(currentEventInstance) {
                                return currentEventInstance.def === eventDef;
                        });

                        if (!eventInstanceGroup.eventInstances.length) {
                                delete eventInstanceGroupsById[eventDef.id];
                        }

                        if (removeCnt) {
                                this.tryRelease();
                        }
                }
        },


        // Releasing and Freezing
        // -----------------------------------------------------------------------------------------------------------------


        tryRelease: function() {
                if (!this.pendingCnt) {
                        if (!this.freezeDepth) {
                                this.release();
                        }
                        else {
                                this.stuntedReleaseCnt++;
                        }
                }
        },


        release: function() {
                this.releaseCnt++;
                this.trigger('release', this.eventInstanceGroupsById);
        },


        whenReleased: function() {
                var _this = this;

                if (this.releaseCnt) {
                        return Promise.resolve(this.eventInstanceGroupsById);
                }
                else {
                        return Promise.construct(function(onResolve) {
                                _this.one('release', onResolve);
                        });
                }
        },


        freeze: function() {
                if (!(this.freezeDepth++)) {
                        this.stuntedReleaseCnt = 0;
                }
        },


        thaw: function() {
                if (!(--this.freezeDepth) && this.stuntedReleaseCnt && !this.pendingCnt) {
                        this.release();
                }
        }

});

;;

var EventDefParser = {

        parse: function(eventInput, source) {
                if (
                        isTimeString(eventInput.start) || moment.isDuration(eventInput.start) ||
                        isTimeString(eventInput.end) || moment.isDuration(eventInput.end)
                ) {
                        return RecurringEventDef.parse(eventInput, source);
                }
                else {
                        return SingleEventDef.parse(eventInput, source);
                }
        }

};

;;

var EventDef = FC.EventDef = Class.extend(ParsableModelMixin, {

        source: null, // required

        id: null, // normalized supplied ID
        rawId: null, // unnormalized supplied ID
        uid: null, // internal ID. new ID for every definition

        // NOTE: eventOrder sorting relies on these
        title: null,
        url: null,
        rendering: null,
        constraint: null,
        overlap: null,
        editable: null,
        startEditable: null,
        durationEditable: null,
        color: null,
        backgroundColor: null,
        borderColor: null,
        textColor: null,

        className: null, // an array. TODO: rename to className*s* (API breakage)
        miscProps: null,


        constructor: function(source) {
                this.source = source;
                this.className = [];
                this.miscProps = {};
        },


        isAllDay: function() {
                // subclasses must implement
        },


        buildInstances: function(unzonedRange) {
                // subclasses must implement
        },


        clone: function() {
                var copy = new this.constructor(this.source);

                copy.id = this.id;
                copy.rawId = this.rawId;
                copy.uid = this.uid; // not really unique anymore :(

                EventDef.copyVerbatimStandardProps(this, copy);

                copy.className = this.className; // should clone?
                copy.miscProps = $.extend({}, this.miscProps);

                return copy;
        },


        hasInverseRendering: function() {
                return this.getRendering() === 'inverse-background';
        },


        hasBgRendering: function() {
                var rendering = this.getRendering();

                return rendering === 'inverse-background' || rendering === 'background';
        },


        getRendering: function() {
                if (this.rendering != null) {
                        return this.rendering;
                }

                return this.source.rendering;
        },


        getConstraint: function() {
                if (this.constraint != null) {
                        return this.constraint;
                }

                if (this.source.constraint != null) {
                        return this.source.constraint;
                }

                return this.source.calendar.opt('eventConstraint'); // what about View option?
        },


        getOverlap: function() {
                if (this.overlap != null) {
                        return this.overlap;
                }

                if (this.source.overlap != null) {
                        return this.source.overlap;
                }

                return this.source.calendar.opt('eventOverlap'); // what about View option?
        },


        isStartExplicitlyEditable: function() {
                if (this.startEditable !== null) {
                        return this.startEditable;
                }

                return this.source.startEditable;
        },


        isDurationExplicitlyEditable: function() {
                if (this.durationEditable !== null) {
                        return this.durationEditable;
                }

                return this.source.durationEditable;
        },


        isExplicitlyEditable: function() {
                if (this.editable !== null) {
                        return this.editable;
                }

                return this.source.editable;
        },


        toLegacy: function() {
                var obj = $.extend({}, this.miscProps);

                obj._id = this.uid;
                obj.source = this.source;
                obj.className = this.className; // should clone?
                obj.allDay = this.isAllDay();

                if (this.rawId != null) {
                        obj.id = this.rawId;
                }

                EventDef.copyVerbatimStandardProps(this, obj);

                return obj;
        },


        applyManualRawProps: function(rawProps) {

                if (rawProps.id != null) {
                        this.id = EventDef.normalizeId((this.rawId = rawProps.id));
                }
                else {
                        this.id = EventDef.generateId();
                }

                if (rawProps._id != null) { // accept this prop, even tho somewhat internal
                        this.uid = String(rawProps._id);
                }
                else {
                        this.uid = EventDef.generateId();
                }

                // TODO: converge with EventSource
                if ($.isArray(rawProps.className)) {
                        this.className = rawProps.className;
                }
                if (typeof rawProps.className === 'string') {
                        this.className = rawProps.className.split(/\s+/);
                }

                return true;
        },


        applyOtherRawProps: function(rawProps) {
                this.miscProps = rawProps;
        }

});

// finish initializing the mixin
EventDef.allowRawProps = ParsableModelMixin_allowRawProps;
EventDef.copyVerbatimStandardProps = ParsableModelMixin_copyVerbatimStandardProps;


// IDs
// ---------------------------------------------------------------------------------------------------------------------
// TODO: converge with EventSource


EventDef.uuid = 0;


EventDef.normalizeId = function(id) {
        return String(id);
};


EventDef.generateId = function() {
        return '_fc' + (EventDef.uuid++);
};


// Parsing
// ---------------------------------------------------------------------------------------------------------------------


EventDef.allowRawProps({
        // not automatically assigned (`false`)
        _id: false,
        id: false,
        className: false,
        source: false, // will ignored

        // automatically assigned (`true`)
        title: true,
        url: true,
        rendering: true,
        constraint: true,
        overlap: true,
        editable: true,
        startEditable: true,
        durationEditable: true,
        color: true,
        backgroundColor: true,
        borderColor: true,
        textColor: true
});


EventDef.parse = function(rawInput, source) {
        var def = new this(source);
        var calendarTransform = source.calendar.opt('eventDataTransform');
        var sourceTransform = source.eventDataTransform;

        if (calendarTransform) {
                rawInput = calendarTransform(rawInput);
        }
        if (sourceTransform) {
                rawInput = sourceTransform(rawInput);
        }

        if (def.applyRawProps(rawInput)) {
                return def;
        }

        return false;
};

;;

var SingleEventDef = EventDef.extend({

        dateProfile: null,


        /*
        Will receive start/end params, but will be ignored.
        */
        buildInstances: function() {
                return [ this.buildInstance() ];
        },


        buildInstance: function() {
                return new EventInstance(
                        this, // definition
                        this.dateProfile
                );
        },


        isAllDay: function() {
                return this.dateProfile.isAllDay();
        },


        clone: function() {
                var def = EventDef.prototype.clone.call(this);

                def.dateProfile = this.dateProfile;

                return def;
        },


        rezone: function() {
                var calendar = this.source.calendar;
                var dateProfile = this.dateProfile;

                this.dateProfile = new EventDateProfile(
                        calendar.moment(dateProfile.start),
                        dateProfile.end ? calendar.moment(dateProfile.end) : null,
                        calendar
                );
        },


        /*
        NOTE: if super-method fails, should still attempt to apply
        */
        applyManualRawProps: function(rawProps) {
                var superSuccess = EventDef.prototype.applyManualRawProps.apply(this, arguments);
                var dateProfile = EventDateProfile.parse(rawProps, this.source); // returns null on failure

                if (dateProfile) {
                        this.dateProfile = dateProfile;

                        // make sure `date` shows up in the legacy event objects as-is
                        if (rawProps.date != null) {
                                this.miscProps.date = rawProps.date;
                        }

                        return superSuccess;
                }
                else {
                        return false;
                }
        }

});


// Parsing
// ---------------------------------------------------------------------------------------------------------------------


SingleEventDef.allowRawProps({ // false = manually process
        start: false,
        date: false, // alias for 'start'
        end: false,
        allDay: false
});

;;

var RecurringEventDef = EventDef.extend({

        startTime: null, // duration
        endTime: null, // duration, or null
        dowHash: null, // object hash, or null


        isAllDay: function() {
                return !this.startTime && !this.endTime;
        },


        buildInstances: function(unzonedRange) {
                var calendar = this.source.calendar;
                var unzonedDate = unzonedRange.getStart();
                var unzonedEnd = unzonedRange.getEnd();
                var zonedDayStart;
                var instanceStart, instanceEnd;
                var instances = [];

                while (unzonedDate.isBefore(unzonedEnd)) {

                        // if everyday, or this particular day-of-week
                        if (!this.dowHash || this.dowHash[unzonedDate.day()]) {

                                zonedDayStart = calendar.applyTimezone(unzonedDate);
                                instanceStart = zonedDayStart.clone();
                                instanceEnd = null;

                                if (this.startTime) {
                                        instanceStart.time(this.startTime);
                                }
                                else {
                                        instanceStart.stripTime();
                                }

                                if (this.endTime) {
                                        instanceEnd = zonedDayStart.clone().time(this.endTime);
                                }

                                instances.push(
                                        new EventInstance(
                                                this, // definition
                                                new EventDateProfile(instanceStart, instanceEnd, calendar)
                                        )
                                );
                        }

                        unzonedDate.add(1, 'days');
                }

                return instances;
        },


        setDow: function(dowNumbers) {

                if (!this.dowHash) {
                        this.dowHash = {};
                }

                for (var i = 0; i < dowNumbers.length; i++) {
                        this.dowHash[dowNumbers[i]] = true;
                }
        },


        clone: function() {
                var def = EventDef.prototype.clone.call(this);

                if (def.startTime) {
                        def.startTime = moment.duration(this.startTime);
                }

                if (def.endTime) {
                        def.endTime = moment.duration(this.endTime);
                }

                if (this.dowHash) {
                        def.dowHash = $.extend({}, this.dowHash);
                }

                return def;
        },


        /*
        NOTE: if super-method fails, should still attempt to apply
        */
        applyRawProps: function(rawProps) {
                var superSuccess = EventDef.prototype.applyRawProps.apply(this, arguments);

                if (rawProps.start) {
                        this.startTime = moment.duration(rawProps.start);
                }

                if (rawProps.end) {
                        this.endTime = moment.duration(rawProps.end);
                }

                if (rawProps.dow) {
                        this.setDow(rawProps.dow);
                }

                return superSuccess;
        }

});


// Parsing
// ---------------------------------------------------------------------------------------------------------------------


RecurringEventDef.allowRawProps({ // false = manually process
        start: false,
        end: false,
        dow: false
});

;;

var EventInstance = Class.extend({

        def: null, // EventDef
        dateProfile: null, // EventDateProfile


        constructor: function(def, dateProfile) {
                this.def = def;
                this.dateProfile = dateProfile;
        },


        toLegacy: function() {
                var dateProfile = this.dateProfile;
                var obj = this.def.toLegacy();

                obj.start = dateProfile.start.clone();
                obj.end = dateProfile.end ? dateProfile.end.clone() : null;

                return obj;
        }

});

;;

/*
It's expected that there will be at least one EventInstance,
OR that an explicitEventDef is assigned.
*/
var EventInstanceGroup = Class.extend({

        eventInstances: null,
        explicitEventDef: null, // optional


        constructor: function(eventInstances) {
                this.eventInstances = eventInstances || [];
        },


        getAllEventRanges: function() {
                return eventInstancesToEventRanges(this.eventInstances);
        },


        sliceRenderRanges: function(constraintRange) {
                if (this.isInverse()) {
                        return this.sliceInverseRenderRanges(constraintRange);
                }
                else {
                        return this.sliceNormalRenderRanges(constraintRange);
                }
        },


        sliceNormalRenderRanges: function(constraintRange) {
                var eventInstances = this.eventInstances;
                var i, eventInstance;
                var slicedRange;
                var slicedEventRanges = [];

                for (i = 0; i < eventInstances.length; i++) {
                        eventInstance = eventInstances[i];

                        slicedRange = eventInstance.dateProfile.unzonedRange.intersect(constraintRange);

                        if (slicedRange) {
                                slicedEventRanges.push(
                                        new EventRange(
                                                slicedRange,
                                                eventInstance.def,
                                                eventInstance
                                        )
                                );
                        }
                }

                return slicedEventRanges;
        },


        sliceInverseRenderRanges: function(constraintRange) {
                var unzonedRanges = eventInstancesToUnzonedRanges(this.eventInstances);
                var ownerDef = this.getEventDef();

                unzonedRanges = invertUnzonedRanges(unzonedRanges, constraintRange);

                return unzonedRanges.map(function(unzonedRange) {
                        return new EventRange(unzonedRange, ownerDef); // don't give an EventDef
                });
        },


        isInverse: function() {
                return this.getEventDef().hasInverseRendering();
        },


        getEventDef: function() {
                return this.explicitEventDef || this.eventInstances[0].def;
        }

});

;;

/*
Meant to be immutable
*/
var EventDateProfile = Class.extend({

        start: null,
        end: null,
        unzonedRange: null,


        constructor: function(start, end, calendar) {
                this.start = start;
                this.end = end || null;
                this.unzonedRange = this.buildUnzonedRange(calendar);
        },


        isAllDay: function() {
                return !(this.start.hasTime() || (this.end && this.end.hasTime()));
        },


        /*
        Needs a Calendar object
        */
        buildUnzonedRange: function(calendar) {
                var startMs = this.start.clone().stripZone().valueOf();
                var endMs = this.getEnd(calendar).stripZone().valueOf();

                return new UnzonedRange(startMs, endMs);
        },


        /*
        Needs a Calendar object
        */
        getEnd: function(calendar) {
                return this.end ?
                        this.end.clone() :
                        // derive the end from the start and allDay. compute allDay if necessary
                        calendar.getDefaultEventEnd(
                                this.isAllDay(),
                                this.start
                        );
        }

});


/*
Needs an EventSource object
*/
EventDateProfile.parse = function(rawProps, source) {
        var startInput = rawProps.start || rawProps.date;
        var endInput = rawProps.end;

        if (!startInput) {
                return false;
        }

        var calendar = source.calendar;
        var start = calendar.moment(startInput);
        var end = endInput ? calendar.moment(endInput) : null;
        var forcedAllDay = rawProps.allDay;
        var forceEventDuration = calendar.opt('forceEventDuration');

        if (!start.isValid()) {
                return false;
        }

        if (end && (!end.isValid() || !end.isAfter(start))) {
                end = null;
        }

        if (forcedAllDay == null) {
                forcedAllDay = source.allDayDefault;
                if (forcedAllDay == null) {
                        forcedAllDay = calendar.opt('allDayDefault');
                }
        }

        if (forcedAllDay === true) {
                start.stripTime();
                if (end) {
                        end.stripTime();
                }
        }
        else if (forcedAllDay === false) {
                if (!start.hasTime()) {
                        start.time(0);
                }
                if (end && !end.hasTime()) {
                        end.time(0);
                }
        }

        if (!end && forceEventDuration) {
                end = calendar.getDefaultEventEnd(!start.hasTime(), start);
        }

        return new EventDateProfile(start, end, calendar);
};

;;

var EventRange = Class.extend({

        unzonedRange: null,
        eventDef: null,
        eventInstance: null, // optional


        constructor: function(unzonedRange, eventDef, eventInstance) {
                this.unzonedRange = unzonedRange;
                this.eventDef = eventDef;

                if (eventInstance) {
                        this.eventInstance = eventInstance;
                }
        }

});

;;

var EventFootprint = FC.EventFootprint = Class.extend({

        componentFootprint: null,
        eventDef: null,
        eventInstance: null, // optional


        constructor: function(componentFootprint, eventDef, eventInstance) {
                this.componentFootprint = componentFootprint;
                this.eventDef = eventDef;

                if (eventInstance) {
                        this.eventInstance = eventInstance;
                }
        },


        getEventLegacy: function() {
                return (this.eventInstance || this.eventDef).toLegacy();
        }

});

;;

var EventDefMutation = FC.EventDefMutation = Class.extend({

        // won't ever be empty. will be null instead.
        // callers should use setDateMutation for setting.
        dateMutation: null,

        // hack to get updateEvent/createFromRawProps to work.
        // not undo-able and not considered in isEmpty.
        rawProps: null, // raw (pre-parse-like)


        /*
        eventDef assumed to be a SingleEventDef.
        returns an undo function.
        */
        mutateSingle: function(eventDef) {
                var origDateProfile;

                if (this.dateMutation) {
                        origDateProfile = eventDef.dateProfile;

                        eventDef.dateProfile = this.dateMutation.buildNewDateProfile(
                                origDateProfile,
                                eventDef.source.calendar
                        );
                }

                // can't undo
                if (this.rawProps) {
                        eventDef.applyRawProps(this.rawProps);
                }

                if (origDateProfile) {
                        return function() {
                                eventDef.dateProfile = origDateProfile;
                        };
                }
                else {
                        return function() { };
                }
        },


        setDateMutation: function(dateMutation) {
                if (dateMutation && !dateMutation.isEmpty()) {
                        this.dateMutation = dateMutation;
                }
                else {
                        this.dateMutation = null;
                }
        },


        isEmpty: function() {
                return !this.dateMutation;
        }

});


EventDefMutation.createFromRawProps = function(eventInstance, newRawProps, largeUnit) {
        var eventDef = eventInstance.def;
        var applicableRawProps = {};
        var propName;
        var newDateProfile;
        var dateMutation;
        var defMutation;

        for (propName in newRawProps) {
                if (
                        // ignore object-type custom properties and any date-related properties,
                        // as well as any other internal property
                        typeof newRawProps[propName] !== 'object' &&
                        propName !== 'start' && propName !== 'end' && propName !== 'allDay' &&
                        propName !== 'source' && propName !== '_id'
                ) {
                        applicableRawProps[propName] = newRawProps[propName];
                }
        }

        newDateProfile = EventDateProfile.parse(newRawProps, eventDef.source);

        if (newDateProfile) { // no failure?
                dateMutation = EventDefDateMutation.createFromDiff(
                        eventInstance.dateProfile,
                        newDateProfile,
                        largeUnit
                );
        }

        defMutation = new EventDefMutation();
        defMutation.rawProps = applicableRawProps;

        if (dateMutation) {
                defMutation.dateMutation = dateMutation;
        }

        return defMutation;
};

;;

var EventDefDateMutation = Class.extend({

        clearEnd: false,
        forceTimed: false,
        forceAllDay: false,

        // Durations. if 0-ms duration, will be null instead.
        // Callers should not set this directly.
        dateDelta: null,
        startDelta: null,
        endDelta: null,


        /*
        returns an undo function.
        */
        buildNewDateProfile: function(eventDateProfile, calendar) {
                var start = eventDateProfile.start.clone();
                var end = null;
                var shouldRezone = false;

                if (!this.clearEnd && eventDateProfile.end) {
                        end = eventDateProfile.end.clone();
                }

                if (this.forceTimed) {
                        shouldRezone = true;

                        if (!start.hasTime()) {
                                start.time(0);
                        }

                        if (end && !end.hasTime()) {
                                end.time(0);
                        }
                }
                else if (this.forceAllDay) {

                        if (start.hasTime()) {
                                start.stripTime();
                        }

                        if (end && end.hasTime()) {
                                end.stripTime();
                        }
                }

                if (this.dateDelta) {
                        shouldRezone = true;

                        start.add(this.dateDelta);

                        if (end) {
                                end.add(this.dateDelta);
                        }
                }

                // do this before adding startDelta to start, so we can work off of start
                if (this.endDelta) {
                        shouldRezone = true;

                        if (!end) {
                                end = calendar.getDefaultEventEnd(eventDateProfile.isAllDay(), start);
                        }

                        end.add(this.endDelta);
                }

                if (this.startDelta) {
                        shouldRezone = true;

                        start.add(this.startDelta);
                }

                if (shouldRezone) {
                        start = calendar.applyTimezone(start);

                        if (end) {
                                end = calendar.applyTimezone(end);
                        }
                }

                // TODO: okay to access calendar option?
                if (!end && calendar.opt('forceEventDuration')) {
                        end = calendar.getDefaultEventEnd(eventDateProfile.isAllDay(), start);
                }

                return new EventDateProfile(start, end, calendar);
        },


        setDateDelta: function(dateDelta) {
                if (dateDelta && dateDelta.valueOf()) {
                        this.dateDelta = dateDelta;
                }
                else {
                        this.dateDelta = null;
                }
        },


        setStartDelta: function(startDelta) {
                if (startDelta && startDelta.valueOf()) {
                        this.startDelta = startDelta;
                }
                else {
                        this.startDelta = null;
                }
        },


        setEndDelta: function(endDelta) {
                if (endDelta && endDelta.valueOf()) {
                        this.endDelta = endDelta;
                }
                else {
                        this.endDelta = null;
                }
        },


        isEmpty: function() {
                return !this.clearEnd && !this.forceTimed && !this.forceAllDay &&
                        !this.dateDelta && !this.startDelta && !this.endDelta;
        }

});


EventDefDateMutation.createFromDiff = function(dateProfile0, dateProfile1, largeUnit) {
        var clearEnd = dateProfile0.end && !dateProfile1.end;
        var forceTimed = dateProfile0.isAllDay() && !dateProfile1.isAllDay();
        var forceAllDay = !dateProfile0.isAllDay() && dateProfile1.isAllDay();
        var dateDelta;
        var endDiff;
        var endDelta;
        var mutation;

        // subtracts the dates in the appropriate way, returning a duration
        function subtractDates(date1, date0) { // date1 - date0
                if (largeUnit) {
                        return diffByUnit(date1, date0, largeUnit); // poorly named
                }
                else if (dateProfile1.isAllDay()) {
                        return diffDay(date1, date0); // poorly named
                }
                else {
                        return diffDayTime(date1, date0); // poorly named
                }
        }

        dateDelta = subtractDates(dateProfile1.start, dateProfile0.start);

        if (dateProfile1.end) {
                // use unzonedRanges because dateProfile0.end might be null
                endDiff = subtractDates(
                        dateProfile1.unzonedRange.getEnd(),
                        dateProfile0.unzonedRange.getEnd()
                );
                endDelta = endDiff.subtract(dateDelta);
        }

        mutation = new EventDefDateMutation();
        mutation.clearEnd = clearEnd;
        mutation.forceTimed = forceTimed;
        mutation.forceAllDay = forceAllDay;
        mutation.setDateDelta(dateDelta);
        mutation.setEndDelta(endDelta);

        return mutation;
};

;;

function eventDefsToEventInstances(eventDefs, unzonedRange) {
        var eventInstances = [];
        var i;

        for (i = 0; i < eventDefs.length; i++) {
                eventInstances.push.apply(eventInstances, // append
                        eventDefs[i].buildInstances(unzonedRange)
                );
        }

        return eventInstances;
}


function eventInstancesToEventRanges(eventInstances) {
        return eventInstances.map(function(eventInstance) {
                return new EventRange(
                        eventInstance.dateProfile.unzonedRange,
                        eventInstance.def,
                        eventInstance
                );
        });
}


function eventInstancesToUnzonedRanges(eventInstances) {
        return eventInstances.map(function(eventInstance) {
                return eventInstance.dateProfile.unzonedRange;
        });
}


function eventFootprintsToComponentFootprints(eventFootprints) {
        return eventFootprints.map(function(eventFootprint) {
                return eventFootprint.componentFootprint;
        });
}

;;

var EventSource = Class.extend(ParsableModelMixin, {

        calendar: null,

        id: null, // can stay null
        uid: null,
        color: null,
        backgroundColor: null,
        borderColor: null,
        textColor: null,
        className: null, // array
        editable: null,
        startEditable: null,
        durationEditable: null,
        rendering: null,
        overlap: null,
        constraint: null,
        allDayDefault: null,
        eventDataTransform: null, // optional function


        constructor: function(calendar) {
                this.calendar = calendar;
                this.className = [];
                this.uid = String(EventSource.uuid++);
        },


        fetch: function(start, end, timezone) {
                // subclasses must implement. must return a promise.
        },


        removeEventDefsById: function(eventDefId) {
                // optional for subclasses to implement
        },


        removeAllEventDefs: function() {
                // optional for subclasses to implement
        },


        /*
        For compairing/matching
        */
        getPrimitive: function(otherSource) {
                // subclasses must implement
        },


        parseEventDefs: function(rawEventDefs) {
                var i;
                var eventDef;
                var eventDefs = [];

                for (i = 0; i < rawEventDefs.length; i++) {
                        eventDef = EventDefParser.parse(
                                rawEventDefs[i],
                                this // source
                        );

                        if (eventDef) {
                                eventDefs.push(eventDef);
                        }
                }

                return eventDefs;
        },


        applyManualRawProps: function(rawProps) {

                if (rawProps.id != null) {
                        this.id = EventSource.normalizeId(rawProps.id);
                }

                // TODO: converge with EventDef
                if ($.isArray(rawProps.className)) {
                        this.className = rawProps.className;
                }
                else if (typeof rawProps.className === 'string') {
                        this.className = rawProps.className.split(/\s+/);
                }

                return true;
        }

});


// finish initializing the mixin
EventSource.allowRawProps = ParsableModelMixin_allowRawProps;


// IDs
// ---------------------------------------------------------------------------------------------------------------------
// TODO: converge with EventDef


EventSource.uuid = 0;


EventSource.normalizeId = function(id) {
        if (id) {
                return String(id);
        }

        return null;
};


// Parsing
// ---------------------------------------------------------------------------------------------------------------------


EventSource.allowRawProps({
        // manually process...
        id: false,
        className: false,

        // automatically transfer...
        color: true,
        backgroundColor: true,
        borderColor: true,
        textColor: true,
        editable: true,
        startEditable: true,
        durationEditable: true,
        rendering: true,
        overlap: true,
        constraint: true,
        allDayDefault: true,
        eventDataTransform: true
});


/*
rawInput can be any data type!
*/
EventSource.parse = function(rawInput, calendar) {
        var source = new this(calendar);

        if (typeof rawInput === 'object') {
                if (source.applyRawProps(rawInput)) {
                        return source;
                }
        }

        return false;
};


FC.EventSource = EventSource;

;;

var EventSourceParser = {

        sourceClasses: [],


        registerClass: function(EventSourceClass) {
                this.sourceClasses.unshift(EventSourceClass); // give highest priority
        },


        parse: function(rawInput, calendar) {
                var sourceClasses = this.sourceClasses;
                var i;
                var eventSource;

                for (i = 0; i < sourceClasses.length; i++) {
                        eventSource = sourceClasses[i].parse(rawInput, calendar);

                        if (eventSource) {
                                return eventSource;
                        }
                }
        }

};


FC.EventSourceParser = EventSourceParser;

;;

var ArrayEventSource = EventSource.extend({

        rawEventDefs: null, // unparsed
        eventDefs: null,
        currentTimezone: null,


        constructor: function(calendar) {
                EventSource.apply(this, arguments); // super-constructor
                this.eventDefs = []; // for if setRawEventDefs is never called
        },


        setRawEventDefs: function(rawEventDefs) {
                this.rawEventDefs = rawEventDefs;
                this.eventDefs = this.parseEventDefs(rawEventDefs);
        },


        fetch: function(start, end, timezone) {
                var eventDefs = this.eventDefs;
                var i;

                if (
                        this.currentTimezone !== null &&
                        this.currentTimezone !== timezone
                ) {
                        for (i = 0; i < eventDefs.length; i++) {
                                if (eventDefs[i] instanceof SingleEventDef) {
                                        eventDefs[i].rezone();
                                }
                        }
                }

                this.currentTimezone = timezone;

                return Promise.resolve(eventDefs);
        },


        addEventDef: function(eventDef) {
                this.eventDefs.push(eventDef);
        },


        /*
        eventDefId already normalized to a string
        */
        removeEventDefsById: function(eventDefId) {
                return removeMatching(this.eventDefs, function(eventDef) {
                        return eventDef.id === eventDefId;
                });
        },


        removeAllEventDefs: function() {
                this.eventDefs = [];
        },


        getPrimitive: function() {
                return this.rawEventDefs;
        },


        applyManualRawProps: function(rawProps) {
                var superSuccess = EventSource.prototype.applyManualRawProps.apply(this, arguments);

                this.setRawEventDefs(rawProps.events);

                return superSuccess;
        }

});


ArrayEventSource.allowRawProps({
        events: false // don't automatically transfer
});


ArrayEventSource.parse = function(rawInput, calendar) {
        var rawProps;

        // normalize raw input
        if ($.isArray(rawInput.events)) { // extended form
                rawProps = rawInput;
        }
        else if ($.isArray(rawInput)) { // short form
                rawProps = { events: rawInput };
        }

        if (rawProps) {
                return EventSource.parse.call(this, rawProps, calendar);
        }

        return false;
};


EventSourceParser.registerClass(ArrayEventSource);

FC.ArrayEventSource = ArrayEventSource;

;;

var FuncEventSource = EventSource.extend({

        func: null,


        fetch: function(start, end, timezone) {
                var _this = this;

                this.calendar.pushLoading();

                return Promise.construct(function(onResolve) {
                        _this.func.call(
                                this.calendar,
                                start.clone(),
                                end.clone(),
                                timezone,
                                function(rawEventDefs) {
                                        _this.calendar.popLoading();

                                        onResolve(_this.parseEventDefs(rawEventDefs));
                                }
                        );
                });
        },


        getPrimitive: function() {
                return this.func;
        },


        applyManualRawProps: function(rawProps) {
                var superSuccess = EventSource.prototype.applyManualRawProps.apply(this, arguments);

                this.func = rawProps.events;

                return superSuccess;
        }

});


FuncEventSource.allowRawProps({
        events: false // don't automatically transfer
});


FuncEventSource.parse = function(rawInput, calendar) {
        var rawProps;

        // normalize raw input
        if ($.isFunction(rawInput.events)) { // extended form
                rawProps = rawInput;
        }
        else if ($.isFunction(rawInput)) { // short form
                rawProps = { events: rawInput };
        }

        if (rawProps) {
                return EventSource.parse.call(this, rawProps, calendar);
        }

        return false;
};


EventSourceParser.registerClass(FuncEventSource);

FC.FuncEventSource = FuncEventSource;

;;

var JsonFeedEventSource = EventSource.extend({

        // these props must all be manually set before calling fetch
        startParam: null,
        endParam: null,
        timezoneParam: null,
        ajaxSettings: null,


        fetch: function(start, end, timezone) {
                var _this = this;
                var ajaxSettings = this.ajaxSettings;
                var onSuccess = ajaxSettings.success;
                var onError = ajaxSettings.error;
                var requestParams = this.buildRequestParams(start, end, timezone);

                // todo: eventually handle the promise's then,
                // don't intercept success/error
                // tho will be a breaking API change

                this.calendar.pushLoading();

                return Promise.construct(function(onResolve, onReject) {
                        $.ajax($.extend(
                                {}, // avoid mutation
                                JsonFeedEventSource.AJAX_DEFAULTS,
                                ajaxSettings, // should have a `url`
                                {
                                        data: requestParams,
                                        success: function(rawEventDefs) {
                                                var callbackRes;

                                                _this.calendar.popLoading();

                                                if (rawEventDefs) {
                                                        callbackRes = applyAll(onSuccess, this, arguments); // redirect `this`

                                                        if ($.isArray(callbackRes)) {
                                                                rawEventDefs = callbackRes;
                                                        }

                                                        onResolve(_this.parseEventDefs(rawEventDefs));
                                                }
                                                else {
                                                        onReject();
                                                }
                                        },
                                        error: function() {
                                                _this.calendar.popLoading();

                                                applyAll(onError, this, arguments); // redirect `this`
                                                onReject();
                                        }
                                }
                        ));
                });
        },


        buildRequestParams: function(start, end, timezone) {
                var calendar = this.calendar;
                var ajaxSettings = this.ajaxSettings;
                var startParam, endParam, timezoneParam;
                var customRequestParams;
                var params = {};

                startParam = this.startParam;
                if (startParam == null) {
                        startParam = calendar.opt('startParam');
                }

                endParam = this.endParam;
                if (endParam == null) {
                        endParam = calendar.opt('endParam');
                }

                timezoneParam = this.timezoneParam;
                if (timezoneParam == null) {
                        timezoneParam = calendar.opt('timezoneParam');
                }

                // retrieve any outbound GET/POST $.ajax data from the options
                if ($.isFunction(ajaxSettings.data)) {
                        // supplied as a function that returns a key/value object
                        customRequestParams = ajaxSettings.data();
                }
                else {
                        // probably supplied as a straight key/value object
                        customRequestParams = ajaxSettings.data || {};
                }

                $.extend(params, customRequestParams);

                params[startParam] = start.format();
                params[endParam] = end.format();

                if (timezone && timezone !== 'local') {
                        params[timezoneParam] = timezone;
                }

                return params;
        },


        getPrimitive: function() {
                return this.ajaxSettings.url;
        },


        applyOtherRawProps: function(rawProps) {
                EventSource.prototype.applyOtherRawProps.apply(this, arguments);

                this.ajaxSettings = rawProps;
        }

});


JsonFeedEventSource.AJAX_DEFAULTS = {
        dataType: 'json',
        cache: false
};


JsonFeedEventSource.allowRawProps({
        // automatically transfer (true)...
        startParam: true,
        endParam: true,
        timezoneParam: true
});


JsonFeedEventSource.parse = function(rawInput, calendar) {
        var rawProps;

        // normalize raw input
        if (typeof rawInput.url === 'string') { // extended form
                rawProps = rawInput;
        }
        else if (typeof rawInput === 'string') { // short form
                rawProps = { url: rawInput }; // will end up in ajaxSettings
        }

        if (rawProps) {
                return EventSource.parse.call(this, rawProps, calendar);
        }

        return false;
};


EventSourceParser.registerClass(JsonFeedEventSource);

FC.JsonFeedEventSource = JsonFeedEventSource;

;;

var ThemeRegistry = FC.ThemeRegistry = {

        themeClassHash: {},


        register: function(themeName, themeClass) {
                this.themeClassHash[themeName] = themeClass;
        },


        getThemeClass: function(themeSetting) {
                if (!themeSetting) {
                        return StandardTheme;
                }
                else if (themeSetting === true) {
                        return JqueryUiTheme;
                }
                else {
                        return this.themeClassHash[themeSetting];
                }
        }

};

;;

var Theme = FC.Theme = Class.extend({

        classes: {},
        iconClasses: {},
        baseIconClass: '',
        iconOverrideOption: null,
        iconOverrideCustomButtonOption: null,
        iconOverridePrefix: '',


        constructor: function(optionsModel) {
                this.optionsModel = optionsModel;
                this.processIconOverride();
        },


        processIconOverride: function() {
                if (this.iconOverrideOption) {
                        this.setIconOverride(
                                this.optionsModel.get(this.iconOverrideOption)
                        );
                }
        },


        setIconOverride: function(iconOverrideHash) {
                var iconClassesCopy;
                var buttonName;

                if ($.isPlainObject(iconOverrideHash)) {
                        iconClassesCopy = $.extend({}, this.iconClasses);

                        for (buttonName in iconOverrideHash) {
                                iconClassesCopy[buttonName] = this.applyIconOverridePrefix(
                                        iconOverrideHash[buttonName]
                                );
                        }

                        this.iconClasses = iconClassesCopy;
                }
                else if (iconOverrideHash === false) {
                        this.iconClasses = {};
                }
        },


        applyIconOverridePrefix: function(className) {
                var prefix = this.iconOverridePrefix;

                if (prefix && className.indexOf(prefix) !== 0) { // if not already present
                        className = prefix + className;
                }

                return className;
        },


        getClass: function(key) {
                return this.classes[key] || '';
        },


        getIconClass: function(buttonName) {
                var className = this.iconClasses[buttonName];

                if (className) {
                        return this.baseIconClass + ' ' + className;
                }

                return '';
        },


        getCustomButtonIconClass: function(customButtonProps) {
                var className;

                if (this.iconOverrideCustomButtonOption) {
                        className = customButtonProps[this.iconOverrideCustomButtonOption];

                        if (className) {
                                return this.baseIconClass + ' ' + this.applyIconOverridePrefix(className);
                        }
                }

                return '';
        }

});

;;

var StandardTheme = Theme.extend({

        classes: {
                widget: 'fc-unthemed',
                widgetHeader: 'fc-widget-header',
                widgetContent: 'fc-widget-content',

                buttonGroup: 'fc-button-group',
                button: 'fc-button',
                cornerLeft: 'fc-corner-left',
                cornerRight: 'fc-corner-right',
                stateDefault: 'fc-state-default',
                stateActive: 'fc-state-active',
                stateDisabled: 'fc-state-disabled',
                stateHover: 'fc-state-hover',
                stateDown: 'fc-state-down',

                popoverHeader: 'fc-widget-header',
                popoverContent: 'fc-widget-content',

                // day grid
                headerRow: 'fc-widget-header',
                dayRow: 'fc-widget-content',

                // list view
                listView: 'fc-widget-content'
        },

        baseIconClass: 'fc-icon',
        iconClasses: {
                close: 'fc-icon-x',
                prev: 'fc-icon-left-single-arrow',
                next: 'fc-icon-right-single-arrow',
                prevYear: 'fc-icon-left-double-arrow',
                nextYear: 'fc-icon-right-double-arrow'
        },

        iconOverrideOption: 'buttonIcons',
        iconOverrideCustomButtonOption: 'icon',
        iconOverridePrefix: 'fc-icon-'

});

ThemeRegistry.register('standard', StandardTheme);

;;

var JqueryUiTheme = Theme.extend({

        classes: {
                widget: 'ui-widget',
                widgetHeader: 'ui-widget-header',
                widgetContent: 'ui-widget-content',

                buttonGroup: 'fc-button-group',
                button: 'ui-button',
                cornerLeft: 'ui-corner-left',
                cornerRight: 'ui-corner-right',
                stateDefault: 'ui-state-default',
                stateActive: 'ui-state-active',
                stateDisabled: 'ui-state-disabled',
                stateHover: 'ui-state-hover',
                stateDown: 'ui-state-down',

                today: 'ui-state-highlight',

                popoverHeader: 'ui-widget-header',
                popoverContent: 'ui-widget-content',

                // day grid
                headerRow: 'ui-widget-header',
                dayRow: 'ui-widget-content',

                // list view
                listView: 'ui-widget-content'
        },

        baseIconClass: 'ui-icon',
        iconClasses: {
                close: 'ui-icon-closethick',
                prev: 'ui-icon-circle-triangle-w',
                next: 'ui-icon-circle-triangle-e',
                prevYear: 'ui-icon-seek-prev',
                nextYear: 'ui-icon-seek-next'
        },

        iconOverrideOption: 'themeButtonIcons',
        iconOverrideCustomButtonOption: 'themeIcon',
        iconOverridePrefix: 'ui-icon-'

});

ThemeRegistry.register('jquery-ui', JqueryUiTheme);

;;

var BootstrapTheme = Theme.extend({

        classes: {
                widget: 'fc-bootstrap3',

                tableGrid: 'table-bordered', // avoid `table` class b/c don't want margins. only border color
                tableList: 'table table-striped', // `table` class creates bottom margin but who cares

                buttonGroup: 'btn-group',
                button: 'btn btn-default',
                stateActive: 'active',
                stateDisabled: 'disabled',

                today: 'alert alert-info', // the plain `info` class requires `.table`, too much to ask

                popover: 'panel panel-default',
                popoverHeader: 'panel-heading',
                popoverContent: 'panel-body',

                // day grid
                headerRow: 'panel-default', // avoid `panel` class b/c don't want margins/radius. only border color
                dayRow: 'panel-default', // "

                // list view
                listView: 'panel panel-default'
        },

        baseIconClass: 'glyphicon',
        iconClasses: {
                close: 'glyphicon-remove',
                prev: 'glyphicon-chevron-left',
                next: 'glyphicon-chevron-right',
                prevYear: 'glyphicon-backward',
                nextYear: 'glyphicon-forward'
        },

        iconOverrideOption: 'bootstrapGlyphicons',
        iconOverrideCustomButtonOption: 'bootstrapGlyphicon',
        iconOverridePrefix: 'glyphicon-'

});

ThemeRegistry.register('bootstrap3', BootstrapTheme);

;;

/* An abstract class for the "basic" views, as well as month view. Renders one or more rows of day cells.
----------------------------------------------------------------------------------------------------------------------*/
// It is a manager for a DayGrid subcomponent, which does most of the heavy lifting.
// It is responsible for managing width/height.

var BasicView = FC.BasicView = View.extend({

        scroller: null,

        dayGridClass: DayGrid, // class the dayGrid will be instantiated from (overridable by subclasses)
        dayGrid: null, // the main subcomponent that does most of the heavy lifting

        dayNumbersVisible: false, // display day numbers on each day cell?
        colWeekNumbersVisible: false, // display week numbers along the side?
        cellWeekNumbersVisible: false, // display week numbers in day cell?

        weekNumberWidth: null, // width of all the week-number cells running down the side

        headContainerEl: null, // div that hold's the dayGrid's rendered date header
        headRowEl: null, // the fake row element of the day-of-week header


        initialize: function() {
                this.dayGrid = this.instantiateDayGrid();
                this.addChild(this.dayGrid);

                this.scroller = new Scroller({
                        overflowX: 'hidden',
                        overflowY: 'auto'
                });
        },


        // Generates the DayGrid object this view needs. Draws from this.dayGridClass
        instantiateDayGrid: function() {
                // generate a subclass on the fly with BasicView-specific behavior
                // TODO: cache this subclass
                var subclass = this.dayGridClass.extend(basicDayGridMethods);

                return new subclass(this);
        },


        // Computes the date range that will be rendered.
        buildRenderRange: function(currentUnzonedRange, currentRangeUnit) {
                var renderUnzonedRange = View.prototype.buildRenderRange.apply(this, arguments); // an UnzonedRange
                var start = this.calendar.msToUtcMoment(renderUnzonedRange.startMs, this.isRangeAllDay);
                var end = this.calendar.msToUtcMoment(renderUnzonedRange.endMs, this.isRangeAllDay);

                // year and month views should be aligned with weeks. this is already done for week
                if (/^(year|month)$/.test(currentRangeUnit)) {
                        start.startOf('week');

                        // make end-of-week if not already
                        if (end.weekday()) {
                                end.add(1, 'week').startOf('week'); // exclusively move backwards
                        }
                }

                return this.trimHiddenDays(new UnzonedRange(start, end));
        },


        // Renders the view into `this.el`, which should already be assigned
        renderDates: function() {

                this.dayGrid.breakOnWeeks = /year|month|week/.test(this.currentRangeUnit); // do before Grid::setRange
                this.dayGrid.setRange(this.renderUnzonedRange);

                this.dayNumbersVisible = this.dayGrid.rowCnt > 1; // TODO: make grid responsible
                if (this.opt('weekNumbers')) {
                        if (this.opt('weekNumbersWithinDays')) {
                                this.cellWeekNumbersVisible = true;
                                this.colWeekNumbersVisible = false;
                        }
                        else {
                                this.cellWeekNumbersVisible = false;
                                this.colWeekNumbersVisible = true;
                        };
                }
                this.dayGrid.numbersVisible = this.dayNumbersVisible ||
                        this.cellWeekNumbersVisible || this.colWeekNumbersVisible;

                this.el.addClass('fc-basic-view').html(this.renderSkeletonHtml());
                this.renderHead();

                this.scroller.render();
                var dayGridContainerEl = this.scroller.el.addClass('fc-day-grid-container');
                var dayGridEl = $('<div class="fc-day-grid" />').appendTo(dayGridContainerEl);
                this.el.find('.fc-body > tr > td').append(dayGridContainerEl);

                this.dayGrid.setElement(dayGridEl);
                this.dayGrid.renderDates(this.hasRigidRows());
        },


        // render the day-of-week headers
        renderHead: function() {
                this.headContainerEl =
                        this.el.find('.fc-head-container')
                                .html(this.dayGrid.renderHeadHtml());
                this.headRowEl = this.headContainerEl.find('.fc-row');
        },


        // Unrenders the content of the view. Since we haven't separated skeleton rendering from date rendering,
        // always completely kill the dayGrid's rendering.
        unrenderDates: function() {
                this.dayGrid.unrenderDates();
                this.dayGrid.removeElement();
                this.scroller.destroy();
        },


        // Builds the HTML skeleton for the view.
        // The day-grid component will render inside of a container defined by this HTML.
        renderSkeletonHtml: function() {
                var theme = this.calendar.theme;

                return '' +
                        '<table class="' + theme.getClass('tableGrid') + '">' +
                                '<thead class="fc-head">' +
                                        '<tr>' +
                                                '<td class="fc-head-container ' + theme.getClass('widgetHeader') + '"></td>' +
                                        '</tr>' +
                                '</thead>' +
                                '<tbody class="fc-body">' +
                                        '<tr>' +
                                                '<td class="' + theme.getClass('widgetContent') + '"></td>' +
                                        '</tr>' +
                                '</tbody>' +
                        '</table>';
        },


        // Generates an HTML attribute string for setting the width of the week number column, if it is known
        weekNumberStyleAttr: function() {
                if (this.weekNumberWidth !== null) {
                        return 'style="width:' + this.weekNumberWidth + 'px"';
                }
                return '';
        },


        // Determines whether each row should have a constant height
        hasRigidRows: function() {
                var eventLimit = this.opt('eventLimit');
                return eventLimit && typeof eventLimit !== 'number';
        },


        /* Dimensions
        ------------------------------------------------------------------------------------------------------------------*/


        // Refreshes the horizontal dimensions of the view
        updateWidth: function() {
                if (this.colWeekNumbersVisible) {
                        // Make sure all week number cells running down the side have the same width.
                        // Record the width for cells created later.
                        this.weekNumberWidth = matchCellWidths(
                                this.el.find('.fc-week-number')
                        );
                }
        },


        // Adjusts the vertical dimensions of the view to the specified values
        setHeight: function(totalHeight, isAuto) {
                var eventLimit = this.opt('eventLimit');
                var scrollerHeight;
                var scrollbarWidths;

                // reset all heights to be natural
                this.scroller.clear();
                uncompensateScroll(this.headRowEl);

                this.dayGrid.removeSegPopover(); // kill the "more" popover if displayed

                // is the event limit a constant level number?
                if (eventLimit && typeof eventLimit === 'number') {
                        this.dayGrid.limitRows(eventLimit); // limit the levels first so the height can redistribute after
                }

                // distribute the height to the rows
                // (totalHeight is a "recommended" value if isAuto)
                scrollerHeight = this.computeScrollerHeight(totalHeight);
                this.setGridHeight(scrollerHeight, isAuto);

                // is the event limit dynamically calculated?
                if (eventLimit && typeof eventLimit !== 'number') {
                        this.dayGrid.limitRows(eventLimit); // limit the levels after the grid's row heights have been set
                }

                if (!isAuto) { // should we force dimensions of the scroll container?

                        this.scroller.setHeight(scrollerHeight);
                        scrollbarWidths = this.scroller.getScrollbarWidths();

                        if (scrollbarWidths.left || scrollbarWidths.right) { // using scrollbars?

                                compensateScroll(this.headRowEl, scrollbarWidths);

                                // doing the scrollbar compensation might have created text overflow which created more height. redo
                                scrollerHeight = this.computeScrollerHeight(totalHeight);
                                this.scroller.setHeight(scrollerHeight);
                        }

                        // guarantees the same scrollbar widths
                        this.scroller.lockOverflow(scrollbarWidths);
                }
        },


        // given a desired total height of the view, returns what the height of the scroller should be
        computeScrollerHeight: function(totalHeight) {
                return totalHeight -
                        subtractInnerElHeight(this.el, this.scroller.el); // everything that's NOT the scroller
        },


        // Sets the height of just the DayGrid component in this view
        setGridHeight: function(height, isAuto) {
                if (isAuto) {
                        undistributeHeight(this.dayGrid.rowEls); // let the rows be their natural height with no expanding
                }
                else {
                        distributeHeight(this.dayGrid.rowEls, height, true); // true = compensate for height-hogging rows
                }
        },


        /* Scroll
        ------------------------------------------------------------------------------------------------------------------*/


        computeInitialDateScroll: function() {
                return { top: 0 };
        },


        queryDateScroll: function() {
                return { top: this.scroller.getScrollTop() };
        },


        applyDateScroll: function(scroll) {
                if (scroll.top !== undefined) {
                        this.scroller.setScrollTop(scroll.top);
                }
        },


        /* Events
        ------------------------------------------------------------------------------------------------------------------*/


        // Renders the given events onto the view and populates the segments array
        renderEventsPayload: function(eventsPayload) {
                this.dayGrid.renderEventsPayload(eventsPayload);

                // must compensate for events that overflow the row
                // TODO: how will ChronoComponent handle this?
                this.updateHeight();
        }

});


// Methods that will customize the rendering behavior of the BasicView's dayGrid
var basicDayGridMethods = {


        // Generates the HTML that will go before the day-of week header cells
        renderHeadIntroHtml: function() {
                var view = this.view;

                if (view.colWeekNumbersVisible) {
                        return '' +
                                '<th class="fc-week-number ' + view.calendar.theme.getClass('widgetHeader') + '" ' + view.weekNumberStyleAttr() + '>' +
                                        '<span>' + // needed for matchCellWidths
                                                htmlEscape(this.opt('weekNumberTitle')) +
                                        '</span>' +
                                '</th>';
                }

                return '';
        },


        // Generates the HTML that will go before content-skeleton cells that display the day/week numbers
        renderNumberIntroHtml: function(row) {
                var view = this.view;
                var weekStart = this.getCellDate(row, 0);

                if (view.colWeekNumbersVisible) {
                        return '' +
                                '<td class="fc-week-number" ' + view.weekNumberStyleAttr() + '>' +
                                        view.buildGotoAnchorHtml( // aside from link, important for matchCellWidths
                                                { date: weekStart, type: 'week', forceOff: this.colCnt === 1 },
                                                weekStart.format('w') // inner HTML
                                        ) +
                                '</td>';
                }

                return '';
        },


        // Generates the HTML that goes before the day bg cells for each day-row
        renderBgIntroHtml: function() {
                var view = this.view;

                if (view.colWeekNumbersVisible) {
                        return '<td class="fc-week-number ' + view.calendar.theme.getClass('widgetContent') + '" ' +
                                view.weekNumberStyleAttr() + '></td>';
                }

                return '';
        },


        // Generates the HTML that goes before every other type of row generated by DayGrid.
        // Affects helper-skeleton and highlight-skeleton rows.
        renderIntroHtml: function() {
                var view = this.view;

                if (view.colWeekNumbersVisible) {
                        return '<td class="fc-week-number" ' + view.weekNumberStyleAttr() + '></td>';
                }

                return '';
        }

};

;;

/* A month view with day cells running in rows (one-per-week) and columns
----------------------------------------------------------------------------------------------------------------------*/

var MonthView = FC.MonthView = BasicView.extend({


        // Computes the date range that will be rendered.
        buildRenderRange: function() {
                var renderUnzonedRange = BasicView.prototype.buildRenderRange.apply(this, arguments);
                var start = this.calendar.msToUtcMoment(renderUnzonedRange.startMs, this.isRangeAllDay);
                var end = this.calendar.msToUtcMoment(renderUnzonedRange.endMs, this.isRangeAllDay);
                var rowCnt;

                // ensure 6 weeks
                if (this.isFixedWeeks()) {
                        rowCnt = Math.ceil( // could be partial weeks due to hiddenDays
                                end.diff(start, 'weeks', true) // dontRound=true
                        );
                        end.add(6 - rowCnt, 'weeks');
                }

                return new UnzonedRange(start, end);
        },


        // Overrides the default BasicView behavior to have special multi-week auto-height logic
        setGridHeight: function(height, isAuto) {

                // if auto, make the height of each row the height that it would be if there were 6 weeks
                if (isAuto) {
                        height *= this.rowCnt / 6;
                }

                distributeHeight(this.dayGrid.rowEls, height, !isAuto); // if auto, don't compensate for height-hogging rows
        },


        isFixedWeeks: function() {
                return this.opt('fixedWeekCount');
        },


        isDateInOtherMonth: function(date) {
                return date.month() !== moment.utc(this.currentUnzonedRange.startMs).month(); // TODO: optimize
        }

});

;;

fcViews.basic = {
        'class': BasicView
};

fcViews.basicDay = {
        type: 'basic',
        duration: { days: 1 }
};

fcViews.basicWeek = {
        type: 'basic',
        duration: { weeks: 1 }
};

fcViews.month = {
        'class': MonthView,
        duration: { months: 1 }, // important for prev/next
        defaults: {
                fixedWeekCount: true
        }
};
;;

/* An abstract class for all agenda-related views. Displays one more columns with time slots running vertically.
----------------------------------------------------------------------------------------------------------------------*/
// Is a manager for the TimeGrid subcomponent and possibly the DayGrid subcomponent (if allDaySlot is on).
// Responsible for managing width/height.

var AgendaView = FC.AgendaView = View.extend({

        scroller: null,

        timeGridClass: TimeGrid, // class used to instantiate the timeGrid. subclasses can override
        timeGrid: null, // the main time-grid subcomponent of this view

        dayGridClass: DayGrid, // class used to instantiate the dayGrid. subclasses can override
        dayGrid: null, // the "all-day" subcomponent. if all-day is turned off, this will be null

        axisWidth: null, // the width of the time axis running down the side

        headContainerEl: null, // div that hold's the timeGrid's rendered date header
        noScrollRowEls: null, // set of fake row elements that must compensate when scroller has scrollbars

        // when the time-grid isn't tall enough to occupy the given height, we render an <hr> underneath
        bottomRuleEl: null,

        // indicates that minTime/maxTime affects rendering
        usesMinMaxTime: true,


        initialize: function() {
                this.timeGrid = this.instantiateTimeGrid();
                this.addChild(this.timeGrid);

                if (this.opt('allDaySlot')) { // should we display the "all-day" area?
                        this.dayGrid = this.instantiateDayGrid(); // the all-day subcomponent of this view
                        this.addChild(this.dayGrid);
                }

                this.scroller = new Scroller({
                        overflowX: 'hidden',
                        overflowY: 'auto'
                });
        },


        // Instantiates the TimeGrid object this view needs. Draws from this.timeGridClass
        instantiateTimeGrid: function() {
                var subclass = this.timeGridClass.extend(agendaTimeGridMethods);

                return new subclass(this);
        },


        // Instantiates the DayGrid object this view might need. Draws from this.dayGridClass
        instantiateDayGrid: function() {
                var subclass = this.dayGridClass.extend(agendaDayGridMethods);

                return new subclass(this);
        },


        /* Rendering
        ------------------------------------------------------------------------------------------------------------------*/


        // Renders the view into `this.el`, which has already been assigned
        renderDates: function() {

                this.timeGrid.setRange(this.renderUnzonedRange);

                if (this.dayGrid) {
                        this.dayGrid.setRange(this.renderUnzonedRange);
                }

                this.el.addClass('fc-agenda-view').html(this.renderSkeletonHtml());
                this.renderHead();

                this.scroller.render();
                var timeGridWrapEl = this.scroller.el.addClass('fc-time-grid-container');
                var timeGridEl = $('<div class="fc-time-grid" />').appendTo(timeGridWrapEl);
                this.el.find('.fc-body > tr > td').append(timeGridWrapEl);

                this.timeGrid.setElement(timeGridEl);
                this.timeGrid.renderDates();

                // the <hr> that sometimes displays under the time-grid
                this.bottomRuleEl = $('<hr class="fc-divider ' + this.calendar.theme.getClass('widgetHeader') + '"/>')
                        .appendTo(this.timeGrid.el); // inject it into the time-grid

                if (this.dayGrid) {
                        this.dayGrid.setElement(this.el.find('.fc-day-grid'));
                        this.dayGrid.renderDates();

                        // have the day-grid extend it's coordinate area over the <hr> dividing the two grids
                        this.dayGrid.bottomCoordPadding = this.dayGrid.el.next('hr').outerHeight();
                }

                this.noScrollRowEls = this.el.find('.fc-row:not(.fc-scroller *)'); // fake rows not within the scroller
        },


        // render the day-of-week headers
        renderHead: function() {
                this.headContainerEl =
                        this.el.find('.fc-head-container')
                                .html(this.timeGrid.renderHeadHtml());
        },


        // Unrenders the content of the view. Since we haven't separated skeleton rendering from date rendering,
        // always completely kill each grid's rendering.
        // TODO: move this over to ChronoComponent
        unrenderDates: function() {
                this.timeGrid.unrenderDates();
                this.timeGrid.removeElement();

                if (this.dayGrid) {
                        this.dayGrid.unrenderDates();
                        this.dayGrid.removeElement();
                }

                this.scroller.destroy();
        },


        // Builds the HTML skeleton for the view.
        // The day-grid and time-grid components will render inside containers defined by this HTML.
        renderSkeletonHtml: function() {
                var theme = this.calendar.theme;

                return '' +
                        '<table class="' + theme.getClass('tableGrid') + '">' +
                                '<thead class="fc-head">' +
                                        '<tr>' +
                                                '<td class="fc-head-container ' + theme.getClass('widgetHeader') + '"></td>' +
                                        '</tr>' +
                                '</thead>' +
                                '<tbody class="fc-body">' +
                                        '<tr>' +
                                                '<td class="' + theme.getClass('widgetContent') + '">' +
                                                        (this.dayGrid ?
                                                                '<div class="fc-day-grid"/>' +
                                                                '<hr class="fc-divider ' + theme.getClass('widgetHeader') + '"/>' :
                                                                ''
                                                                ) +
                                                '</td>' +
                                        '</tr>' +
                                '</tbody>' +
                        '</table>';
        },


        // Generates an HTML attribute string for setting the width of the axis, if it is known
        axisStyleAttr: function() {
                if (this.axisWidth !== null) {
                         return 'style="width:' + this.axisWidth + 'px"';
                }
                return '';
        },


        /* Now Indicator
        ------------------------------------------------------------------------------------------------------------------*/


        getNowIndicatorUnit: function() {
                return this.timeGrid.getNowIndicatorUnit();
        },


        /* Dimensions
        ------------------------------------------------------------------------------------------------------------------*/


        updateSize: function(isResize) {
                this.timeGrid.updateSize(isResize);

                View.prototype.updateSize.call(this, isResize); // call the super-method
        },


        // Refreshes the horizontal dimensions of the view
        updateWidth: function() {
                // make all axis cells line up, and record the width so newly created axis cells will have it
                this.axisWidth = matchCellWidths(this.el.find('.fc-axis'));
        },


        // Adjusts the vertical dimensions of the view to the specified values
        setHeight: function(totalHeight, isAuto) {
                var eventLimit;
                var scrollerHeight;
                var scrollbarWidths;

                // reset all dimensions back to the original state
                this.bottomRuleEl.hide(); // .show() will be called later if this <hr> is necessary
                this.scroller.clear(); // sets height to 'auto' and clears overflow
                uncompensateScroll(this.noScrollRowEls);

                // limit number of events in the all-day area
                if (this.dayGrid) {
                        this.dayGrid.removeSegPopover(); // kill the "more" popover if displayed

                        eventLimit = this.opt('eventLimit');
                        if (eventLimit && typeof eventLimit !== 'number') {
                                eventLimit = AGENDA_ALL_DAY_EVENT_LIMIT; // make sure "auto" goes to a real number
                        }
                        if (eventLimit) {
                                this.dayGrid.limitRows(eventLimit);
                        }
                }

                if (!isAuto) { // should we force dimensions of the scroll container?

                        scrollerHeight = this.computeScrollerHeight(totalHeight);
                        this.scroller.setHeight(scrollerHeight);
                        scrollbarWidths = this.scroller.getScrollbarWidths();

                        if (scrollbarWidths.left || scrollbarWidths.right) { // using scrollbars?

                                // make the all-day and header rows lines up
                                compensateScroll(this.noScrollRowEls, scrollbarWidths);

                                // the scrollbar compensation might have changed text flow, which might affect height, so recalculate
                                // and reapply the desired height to the scroller.
                                scrollerHeight = this.computeScrollerHeight(totalHeight);
                                this.scroller.setHeight(scrollerHeight);
                        }

                        // guarantees the same scrollbar widths
                        this.scroller.lockOverflow(scrollbarWidths);

                        // if there's any space below the slats, show the horizontal rule.
                        // this won't cause any new overflow, because lockOverflow already called.
                        if (this.timeGrid.getTotalSlatHeight() < scrollerHeight) {
                                this.bottomRuleEl.show();
                        }
                }
        },


        // given a desired total height of the view, returns what the height of the scroller should be
        computeScrollerHeight: function(totalHeight) {
                return totalHeight -
                        subtractInnerElHeight(this.el, this.scroller.el); // everything that's NOT the scroller
        },


        /* Scroll
        ------------------------------------------------------------------------------------------------------------------*/


        // Computes the initial pre-configured scroll state prior to allowing the user to change it
        computeInitialDateScroll: function() {
                var scrollTime = moment.duration(this.opt('scrollTime'));
                var top = this.timeGrid.computeTimeTop(scrollTime);

                // zoom can give weird floating-point values. rather scroll a little bit further
                top = Math.ceil(top);

                if (top) {
                        top++; // to overcome top border that slots beyond the first have. looks better
                }

                return { top: top };
        },


        queryDateScroll: function() {
                return { top: this.scroller.getScrollTop() };
        },


        applyDateScroll: function(scroll) {
                if (scroll.top !== undefined) {
                        this.scroller.setScrollTop(scroll.top);
                }
        },


        /* Hit Areas
        ------------------------------------------------------------------------------------------------------------------*/
        // forward all hit-related method calls to the grids (dayGrid might not be defined)


        getHitFootprint: function(hit) {
                // TODO: hit.component is set as a hack to identify where the hit came from
                return hit.component.getHitFootprint(hit);
        },


        getHitEl: function(hit) {
                // TODO: hit.component is set as a hack to identify where the hit came from
                return hit.component.getHitEl(hit);
        },


        /* Events
        ------------------------------------------------------------------------------------------------------------------*/


        // Renders events onto the view and populates the View's segment array
        renderEventsPayload: function(eventsPayload) {
                var dayEventsPayload = {};
                var timedEventsPayload = {};
                var daySegs = [];
                var timedSegs;
                var id, eventInstanceGroup;

                // separate the events into all-day and timed
                for (id in eventsPayload) {
                        eventInstanceGroup = eventsPayload[id];

                        if (eventInstanceGroup.getEventDef().isAllDay()) {
                                dayEventsPayload[id] = eventInstanceGroup;
                        }
                        else {
                                timedEventsPayload[id] = eventInstanceGroup;
                        }
                }

                // render the events in the subcomponents
                timedSegs = this.timeGrid.renderEventsPayload(timedEventsPayload);
                if (this.dayGrid) {
                        daySegs = this.dayGrid.renderEventsPayload(dayEventsPayload);
                }

                // the all-day area is flexible and might have a lot of events, so shift the height
                // TODO: how will ChronoComponent handle this?
                this.updateHeight();
        },


        /* Dragging (for events and external elements)
        ------------------------------------------------------------------------------------------------------------------*/


        // A returned value of `true` signals that a mock "helper" event has been rendered.
        renderDrag: function(eventFootprints, seg) {
                if (eventFootprints.length) {
                        if (!eventFootprints[0].componentFootprint.isAllDay) {
                                return this.timeGrid.renderDrag(eventFootprints, seg);
                        }
                        else if (this.dayGrid) {
                                return this.dayGrid.renderDrag(eventFootprints, seg);
                        }
                }
        },


        /* Selection
        ------------------------------------------------------------------------------------------------------------------*/


        // Renders a visual indication of a selection
        renderSelectionFootprint: function(componentFootprint) {
                if (!componentFootprint.isAllDay) {
                        this.timeGrid.renderSelectionFootprint(componentFootprint);
                }
                else if (this.dayGrid) {
                        this.dayGrid.renderSelectionFootprint(componentFootprint);
                }
        }

});


// Methods that will customize the rendering behavior of the AgendaView's timeGrid
// TODO: move into TimeGrid
var agendaTimeGridMethods = {


        // Generates the HTML that will go before the day-of week header cells
        renderHeadIntroHtml: function() {
                var view = this.view;
                var weekStart = view.calendar.msToUtcMoment(this.unzonedRange.startMs, true);
                var weekText;

                if (this.opt('weekNumbers')) {
                        weekText = weekStart.format(this.opt('smallWeekFormat'));

                        return '' +
                                '<th class="fc-axis fc-week-number ' + view.calendar.theme.getClass('widgetHeader') + '" ' + view.axisStyleAttr() + '>' +
                                        view.buildGotoAnchorHtml( // aside from link, important for matchCellWidths
                                                { date: weekStart, type: 'week', forceOff: this.colCnt > 1 },
                                                htmlEscape(weekText) // inner HTML
                                        ) +
                                '</th>';
                }
                else {
                        return '<th class="fc-axis ' + view.calendar.theme.getClass('widgetHeader') + '" ' + view.axisStyleAttr() + '></th>';
                }
        },


        // Generates the HTML that goes before the bg of the TimeGrid slot area. Long vertical column.
        renderBgIntroHtml: function() {
                var view = this.view;

                return '<td class="fc-axis ' + view.calendar.theme.getClass('widgetContent') + '" ' + view.axisStyleAttr() + '></td>';
        },


        // Generates the HTML that goes before all other types of cells.
        // Affects content-skeleton, helper-skeleton, highlight-skeleton for both the time-grid and day-grid.
        renderIntroHtml: function() {
                var view = this.view;

                return '<td class="fc-axis" ' + view.axisStyleAttr() + '></td>';
        }

};


// Methods that will customize the rendering behavior of the AgendaView's dayGrid
var agendaDayGridMethods = {


        // Generates the HTML that goes before the all-day cells
        renderBgIntroHtml: function() {
                var view = this.view;

                return '' +
                        '<td class="fc-axis ' + view.calendar.theme.getClass('widgetContent') + '" ' + view.axisStyleAttr() + '>' +
                                '<span>' + // needed for matchCellWidths
                                        view.getAllDayHtml() +
                                '</span>' +
                        '</td>';
        },


        // Generates the HTML that goes before all other types of cells.
        // Affects content-skeleton, helper-skeleton, highlight-skeleton for both the time-grid and day-grid.
        renderIntroHtml: function() {
                var view = this.view;

                return '<td class="fc-axis" ' + view.axisStyleAttr() + '></td>';
        }

};

;;

var AGENDA_ALL_DAY_EVENT_LIMIT = 5;

// potential nice values for the slot-duration and interval-duration
// from largest to smallest
var AGENDA_STOCK_SUB_DURATIONS = [
        { hours: 1 },
        { minutes: 30 },
        { minutes: 15 },
        { seconds: 30 },
        { seconds: 15 }
];

fcViews.agenda = {
        'class': AgendaView,
        defaults: {
                allDaySlot: true,
                slotDuration: '00:30:00',
                slotEventOverlap: true // a bad name. confused with overlap/constraint system
        }
};

fcViews.agendaDay = {
        type: 'agenda',
        duration: { days: 1 }
};

fcViews.agendaWeek = {
        type: 'agenda',
        duration: { weeks: 1 }
};
;;

/*
Responsible for the scroller, and forwarding event-related actions into the "grid"
*/
var ListView = View.extend({

        grid: null,
        scroller: null,

        initialize: function() {
                this.grid = new ListViewGrid(this);
                this.addChild(this.grid);

                this.scroller = new Scroller({
                        overflowX: 'hidden',
                        overflowY: 'auto'
                });
        },

        renderSkeleton: function() {
                this.el.addClass(
                        'fc-list-view ' +
                        this.calendar.theme.getClass('listView')
                );

                this.scroller.render();
                this.scroller.el.appendTo(this.el);

                this.grid.setElement(this.scroller.scrollEl);
        },

        unrenderSkeleton: function() {
                this.scroller.destroy(); // will remove the Grid too
        },

        setHeight: function(totalHeight, isAuto) {
                this.scroller.setHeight(this.computeScrollerHeight(totalHeight));
        },

        computeScrollerHeight: function(totalHeight) {
                return totalHeight -
                        subtractInnerElHeight(this.el, this.scroller.el); // everything that's NOT the scroller
        },

        renderDates: function() {
                this.grid.setRange(this.renderUnzonedRange); // needs to process range-related options
        },

        isEventDefResizable: function(eventDef) {
                return false;
        },

        isEventDefDraggable: function(eventDef) {
                return false;
        }

});

/*
Responsible for event rendering and user-interaction.
Its "el" is the inner-content of the above view's scroller.
*/
var ListViewGrid = Grid.extend({

        dayDates: null, // localized ambig-time moment array
        dayRanges: null, // UnzonedRange[], of start-end of each day
        segSelector: '.fc-list-item', // which elements accept event actions
        hasDayInteractions: false, // no day selection or day clicking

        rangeUpdated: function() {
                var calendar = this.view.calendar;
                var dayStart = calendar.msToUtcMoment(this.unzonedRange.startMs, true);
                var viewEnd = calendar.msToUtcMoment(this.unzonedRange.endMs, true);
                var dayDates = [];
                var dayRanges = [];

                while (dayStart < viewEnd) {

                        dayDates.push(dayStart.clone());

                        dayRanges.push(new UnzonedRange(
                                dayStart,
                                dayStart.clone().add(1, 'day')
                        ));

                        dayStart.add(1, 'day');
                }

                this.dayDates = dayDates;
                this.dayRanges = dayRanges;
        },

        // slices by day
        componentFootprintToSegs: function(footprint) {
                var view = this.view;
                var dayRanges = this.dayRanges;
                var dayIndex;
                var segRange;
                var seg;
                var segs = [];

                for (dayIndex = 0; dayIndex < dayRanges.length; dayIndex++) {
                        segRange = footprint.unzonedRange.intersect(dayRanges[dayIndex]);

                        if (segRange) {
                                seg = {
                                        startMs: segRange.startMs,
                                        endMs: segRange.endMs,
                                        isStart: segRange.isStart,
                                        isEnd: segRange.isEnd,
                                        dayIndex: dayIndex
                                };

                                segs.push(seg);

                                // detect when footprint won't go fully into the next day,
                                // and mutate the latest seg to the be the end.
                                if (
                                        !seg.isEnd && !footprint.isAllDay &&
                                        footprint.unzonedRange.endMs < dayRanges[dayIndex + 1].startMs + view.nextDayThreshold
                                ) {
                                        seg.endMs = footprint.unzonedRange.endMs;
                                        seg.isEnd = true;
                                        break;
                                }
                        }
                }

                return segs;
        },

        // like "4:00am"
        computeEventTimeFormat: function() {
                return this.opt('mediumTimeFormat');
        },

        // for events with a url, the whole <tr> should be clickable,
        // but it's impossible to wrap with an <a> tag. simulate this.
        handleSegClick: function(seg, ev) {
                var url;

                Grid.prototype.handleSegClick.apply(this, arguments); // super. might prevent the default action

                // not clicking on or within an <a> with an href
                if (!$(ev.target).closest('a[href]').length) {
                        url = seg.footprint.eventDef.url;

                        if (url && !ev.isDefaultPrevented()) { // jsEvent not cancelled in handler
                                window.location.href = url; // simulate link click
                        }
                }
        },

        // returns list of foreground segs that were actually rendered
        renderFgSegs: function(segs) {
                segs = this.renderFgSegEls(segs); // might filter away hidden events

                if (!segs.length) {
                        this.renderEmptyMessage();
                }
                else {
                        this.renderSegList(segs);
                }

                return segs;
        },

        renderEmptyMessage: function() {
                this.el.html(
                        '<div class="fc-list-empty-wrap2">' + // TODO: try less wraps
                        '<div class="fc-list-empty-wrap1">' +
                        '<div class="fc-list-empty">' +
                                htmlEscape(this.opt('noEventsMessage')) +
                        '</div>' +
                        '</div>' +
                        '</div>'
                );
        },

        // render the event segments in the view
        renderSegList: function(allSegs) {
                var segsByDay = this.groupSegsByDay(allSegs); // sparse array
                var dayIndex;
                var daySegs;
                var i;
                var tableEl = $('<table class="fc-list-table ' + this.view.calendar.theme.getClass('tableList') + '"><tbody/></table>');
                var tbodyEl = tableEl.find('tbody');

                for (dayIndex = 0; dayIndex < segsByDay.length; dayIndex++) {
                        daySegs = segsByDay[dayIndex];

                        if (daySegs) { // sparse array, so might be undefined

                                // append a day header
                                tbodyEl.append(this.dayHeaderHtml(this.dayDates[dayIndex]));

                                this.sortEventSegs(daySegs);

                                for (i = 0; i < daySegs.length; i++) {
                                        tbodyEl.append(daySegs[i].el); // append event row
                                }
                        }
                }

                this.el.empty().append(tableEl);
        },

        // Returns a sparse array of arrays, segs grouped by their dayIndex
        groupSegsByDay: function(segs) {
                var segsByDay = []; // sparse array
                var i, seg;

                for (i = 0; i < segs.length; i++) {
                        seg = segs[i];
                        (segsByDay[seg.dayIndex] || (segsByDay[seg.dayIndex] = []))
                                .push(seg);
                }

                return segsByDay;
        },

        // generates the HTML for the day headers that live amongst the event rows
        dayHeaderHtml: function(dayDate) {
                var view = this.view;
                var mainFormat = this.opt('listDayFormat');
                var altFormat = this.opt('listDayAltFormat');

                return '<tr class="fc-list-heading" data-date="' + dayDate.format('YYYY-MM-DD') + '">' +
                        '<td class="' + view.calendar.theme.getClass('widgetHeader') + '" colspan="3">' +
                                (mainFormat ?
                                        view.buildGotoAnchorHtml(
                                                dayDate,
                                                { 'class': 'fc-list-heading-main' },
                                                htmlEscape(dayDate.format(mainFormat)) // inner HTML
                                        ) :
                                        '') +
                                (altFormat ?
                                        view.buildGotoAnchorHtml(
                                                dayDate,
                                                { 'class': 'fc-list-heading-alt' },
                                                htmlEscape(dayDate.format(altFormat)) // inner HTML
                                        ) :
                                        '') +
                        '</td>' +
                '</tr>';
        },

        // generates the HTML for a single event row
        fgSegHtml: function(seg) {
                var view = this.view;
                var calendar = view.calendar;
                var theme = calendar.theme;
                var classes = [ 'fc-list-item' ].concat(this.getSegCustomClasses(seg));
                var bgColor = this.getSegBackgroundColor(seg);
                var eventFootprint = seg.footprint;
                var eventDef = eventFootprint.eventDef;
                var componentFootprint = eventFootprint.componentFootprint;
                var url = eventDef.url;
                var timeHtml;

                if (componentFootprint.isAllDay) {
                        timeHtml = view.getAllDayHtml();
                }
                // if the event appears to span more than one day
                else if (view.isMultiDayRange(componentFootprint.unzonedRange)) {
                        if (seg.isStart || seg.isEnd) { // outer segment that probably lasts part of the day
                                timeHtml = htmlEscape(this._getEventTimeText(
                                        calendar.msToMoment(seg.startMs),
                                        calendar.msToMoment(seg.endMs),
                                        componentFootprint.isAllDay
                                ));
                        }
                        else { // inner segment that lasts the whole day
                                timeHtml = view.getAllDayHtml();
                        }
                }
                else {
                        // Display the normal time text for the *event's* times
                        timeHtml = htmlEscape(this.getEventTimeText(eventFootprint));
                }

                if (url) {
                        classes.push('fc-has-url');
                }

                return '<tr class="' + classes.join(' ') + '">' +
                        (this.displayEventTime ?
                                '<td class="fc-list-item-time ' + theme.getClass('widgetContent') + '">' +
                                        (timeHtml || '') +
                                '</td>' :
                                '') +
                        '<td class="fc-list-item-marker ' + theme.getClass('widgetContent') + '">' +
                                '<span class="fc-event-dot"' +
                                (bgColor ?
                                        ' style="background-color:' + bgColor + '"' :
                                        '') +
                                '></span>' +
                        '</td>' +
                        '<td class="fc-list-item-title ' + theme.getClass('widgetContent') + '">' +
                                '<a' + (url ? ' href="' + htmlEscape(url) + '"' : '') + '>' +
                                        htmlEscape(eventDef.title || '') +
                                '</a>' +
                        '</td>' +
                '</tr>';
        }

});

;;

fcViews.list = {
        'class': ListView,
        buttonTextKey: 'list', // what to lookup in locale files
        defaults: {
                buttonText: 'list', // text to display for English
                listDayFormat: 'LL', // like "January 1, 2016"
                noEventsMessage: 'No events to display'
        }
};

fcViews.listDay = {
        type: 'list',
        duration: { days: 1 },
        defaults: {
                listDayFormat: 'dddd' // day-of-week is all we need. full date is probably in header
        }
};

fcViews.listWeek = {
        type: 'list',
        duration: { weeks: 1 },
        defaults: {
                listDayFormat: 'dddd', // day-of-week is more important
                listDayAltFormat: 'LL'
        }
};

fcViews.listMonth = {
        type: 'list',
        duration: { month: 1 },
        defaults: {
                listDayAltFormat: 'dddd' // day-of-week is nice-to-have
        }
};

fcViews.listYear = {
        type: 'list',
        duration: { year: 1 },
        defaults: {
                listDayAltFormat: 'dddd' // day-of-week is nice-to-have
        }
};

;;

return FC; // export for Node/CommonJS
});