[SPIP][PLUGINS] v3.0-->v3.2

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

/*!
 * FullCalendar v3.2.0
 * 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: "3.2.0",
        // 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: 8
};
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 (calendar && $.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');
                                }
                        }
                }
                // 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.intersectRanges = intersectRanges;
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.
// 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.
// NOTE: should use clientLeft/clientTop, but very unreliable cross-browser.
function getScrollbarWidths(el) {
        var leftRightWidth = el.innerWidth() - el[0].clientWidth; // the paddings cancel out, leaving the scrollbars
        var bottomWidth = el.innerHeight() - 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;
}


/* FullCalendar-specific Misc Utilities
----------------------------------------------------------------------------------------------------------------------*/


// Computes the intersection of the two ranges. Will return fresh date clones in a range.
// Returns undefined if no intersection.
// Expects all dates to be normalized to the same timezone beforehand.
// TODO: move to date section?
function intersectRanges(subjectRange, constraintRange) {
        var subjectStart = subjectRange.start;
        var subjectEnd = subjectRange.end;
        var constraintStart = constraintRange.start;
        var constraintEnd = constraintRange.end;
        var segStart, segEnd;
        var isStart, isEnd;

        if (subjectEnd > constraintStart && subjectStart < constraintEnd) { // in bounds at all?

                if (subjectStart >= constraintStart) {
                        segStart = subjectStart.clone();
                        isStart = true;
                }
                else {
                        segStart = constraintStart.clone();
                        isStart =  false;
                }

                if (subjectEnd <= constraintEnd) {
                        segEnd = subjectEnd.clone();
                        isEnd = true;
                }
                else {
                        segEnd = constraintEnd.clone();
                        isEnd = false;
                }

                return {
                        start: segStart,
                        end: segEnd,
                        isStart: isStart,
                        isEnd: isEnd
                };
        }
}


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

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

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


// 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 computeIntervalUnit(start, end) {
        var i, unit;
        var val;

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

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

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


// 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 /^\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;
}


// Create an object that has the given prototype. Just like Object.create
function createObject(proto) {
        var f = function() {};
        f.prototype = proto;
        return new f();
}
FC.createObject = createObject;


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);
}


// Is the given value a non-object non-function value?
function isAtomic(val) {
        return /undefined|null|boolean|number|string/.test($.type(val));
}


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 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(this, 'YYYY-MM-DD');
        }
        if (this._ambigZone) {
                return oldMomentFormat(this, 'YYYY-MM-DD[T]HH:mm:ss');
        }
        return oldMomentProto.format.apply(this, arguments);
};

newMomentProto.toISOString = function() {
        if (this._ambigTime) {
                return oldMomentFormat(this, 'YYYY-MM-DD');
        }
        if (this._ambigZone) {
                return oldMomentFormat(this, 'YYYY-MM-DD[T]HH:mm:ss');
        }
        return oldMomentProto.toISOString.apply(this, arguments);
};

;;
(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 len = arguments.length;
        var i;
        var members;

        for (i = 0; i < len; i++) {
                members = arguments[i];
                if (i < len - 1) { // not the last argument?
                        mixIntoClass(this, members);
                }
        }

        return extendClass(this, members || {}); // members will be undefined if no arguments
};


// 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) {
        mixIntoClass(this, members);
};


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 = createObject(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;
}


function mixIntoClass(theClass, members) {
        copyOwnProps(members, theClass.prototype);
}
;;

/*
Wrap jQuery's Deferred Promise object to be slightly more Promise/A+ compliant.
With the added non-standard feature of synchronously executing handlers on resolved promises,
which doesn't always happen otherwise (esp with nested .then handlers!?),
so, this makes things a lot easier, esp because jQuery 3 changed the synchronicity for Deferred objects.

TODO: write tests and more comments
*/

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

        if (typeof executor === 'function') {
                executor(
                        function(value) { // resolve
                                if (Promise.immediate) {
                                        promise._value = value;
                                }
                                deferred.resolve(value);
                        },
                        function() { // reject
                                deferred.reject();
                        }
                );
        }
        
        if (Promise.immediate) {
                var origThen = promise.then;

                promise.then = function(onFulfilled, onRejected) {
                        var state = promise.state();
                        
                        if (state === 'resolved') {
                                if (typeof onFulfilled === 'function') {
                                        return Promise.resolve(onFulfilled(promise._value));
                                }
                        }
                        else if (state === 'rejected') {
                                if (typeof onRejected === 'function') {
                                        onRejected();
                                        return promise; // already rejected
                                }
                        }

                        return origThen.call(promise, onFulfilled, onRejected);
                };
        }

        return promise; // instanceof Promise will break :( TODO: make Promise a real class
}

FC.Promise = Promise;

Promise.immediate = true;


Promise.resolve = function(value) {
        if (value && typeof value.resolve === 'function') {
                return value.promise();
        }
        if (value && typeof value.then === 'function') {
                return value;
        }
        else {
                var deferred = $.Deferred().resolve(value);
                var promise = deferred.promise();

                if (Promise.immediate) {
                        var origThen = promise.then;

                        promise._value = value;

                        promise.then = function(onFulfilled, onRejected) {
                                if (typeof onFulfilled === 'function') {
                                        return Promise.resolve(onFulfilled(value));
                                }
                                return origThen.call(promise, onFulfilled, onRejected);
                        };
                }

                return promise;
        }
};


Promise.reject = function() {
        return $.Deferred().reject().promise();
};


Promise.all = function(inputs) {
        var hasAllValues = false;
        var values;
        var i, input;

        if (Promise.immediate) {
                hasAllValues = true;
                values = [];

                for (i = 0; i < inputs.length; i++) {
                        input = inputs[i];

                        if (input && typeof input.state === 'function' && input.state() === 'resolved' && ('_value' in input)) {
                                values.push(input._value);
                        }
                        else if (input && typeof input.then === 'function') {
                                hasAllValues = false;
                                break;
                        }
                        else {
                                values.push(input);
                        }
                }
        }

        if (hasAllValues) {
                return Promise.resolve(values);
        }
        else {
                return $.when.apply($.when, inputs).then(function() {
                        return $.when($.makeArray(arguments));
                });
        }
};

;;

// TODO: write tests and clean up code

function TaskQueue(debounceWait) {
        var q = []; // array of runFuncs

        function addTask(taskFunc) {
                return new Promise(function(resolve) {

                        // should run this function when it's taskFunc's turn to run.
                        // responsible for popping itself off the queue.
                        var runFunc = function() {
                                Promise.resolve(taskFunc()) // result might be async, coerce to promise
                                        .then(resolve) // resolve TaskQueue::push's promise, for the caller. will receive result of taskFunc.
                                        .then(function() {
                                                q.shift(); // pop itself off

                                                // run the next task, if any
                                                if (q.length) {
                                                        q[0]();
                                                }
                                        });
                        };

                        // always put the task at the end of the queue, BEFORE running the task
                        q.push(runFunc);

                        // if it's the only task in the queue, run immediately
                        if (q.length === 1) {
                                runFunc();
                        }
                });
        }

        this.add = // potentially debounce, for the public method
                typeof debounceWait === 'number' ?
                        debounce(addTask, debounceWait) :
                        addTask; // if not a number (null/undefined/false), no debounce at all

        this.addQuickly = addTask; // guaranteed no debounce
}

FC.TaskQueue = TaskQueue;

/*
q = new TaskQueue();

function work(i) {
        return q.push(function() {
                trigger();
                console.log('work' + i);
        });
}

var cnt = 0;

function trigger() {
        if (cnt < 5) {
                cnt++;
                work(cnt);
        }
}

work(9);
*/

;;

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
        }

};

;;

/*
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;
})();
;;

/* 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,

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

        shouldCancelTouchScroll: true,
        scrollAlwaysKills: false,


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


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


        startInteraction: function(ev, extraOptions) {
                var isTouch = getEvIsTouch(ev);

                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 = isTouch;
                        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.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());
        },


        // 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();
                }
        }

});

;;

/* An abstract class comprised of a "grid" of areas that each represent a specific datetime
----------------------------------------------------------------------------------------------------------------------*/

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

        // 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

        start: null,
        end: null,

        el: null, // the containing element
        elsByFill: null, // a hash of jQuery element sets used for rendering each fill. Keyed by fill name.

        // derived from options
        eventTimeFormat: null,
        displayEventTime: null,
        displayEventEnd: null,

        minResizeDuration: null, // TODO: hack. set by subclasses. minumum event resize duration

        // 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,

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


        constructor: function(view) {
                this.view = view;
                this.isRTL = view.opt('isRTL');
                this.elsByFill = {};

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


        /* Options
        ------------------------------------------------------------------------------------------------------------------*/


        // Generates the format string used for event time text, if not explicitly defined by 'timeFormat'
        computeEventTimeFormat: function() {
                return this.view.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;
        },


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


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

                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 view = this.view;
                var displayEventTime;
                var displayEventEnd;

                this.eventTimeFormat =
                        view.opt('eventTimeFormat') ||
                        view.opt('timeFormat') || // deprecated
                        this.computeEventTimeFormat();

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

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

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


        // Converts a span (has unzoned start/end and any other grid-specific location information)
        // into an array of segments (pieces of events whose format is decided by the grid).
        spanToSegs: function(span) {
                // subclasses must implement
        },


        // 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);
                }
        },


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

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

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

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


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


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


        // 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 getHitSpan and getHitEl.
        queryHit: function(leftOffset, topOffset) {
        },


        // Given position-level information about a date-related area within the grid,
        // should return an object with at least a start/end date. Can provide other information as well.
        getHitSpan: 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) {
                this.el = el;

                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();

                this.bindGlobalHandlers();
        },


        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() {
                this.unbindGlobalHandlers();
                this.clearDragListeners();

                this.el.remove();

                // NOTE: we don't null-out this.el for the same reasons we don't do it within View::removeElement
        },


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


        // Renders the grid's date-related content (like areas that represent days/times).
        // Assumes setRange has already been called and the skeleton has already been rendered.
        renderDates: function() {
                // subclasses should implement
        },


        // Unrenders the grid's date-related content
        unrenderDates: function() {
                // subclasses should implement
        },


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


        // Binds DOM handlers to elements that reside outside the grid, such as the document
        bindGlobalHandlers: function() {
                this.listenTo($(document), {
                        dragstart: this.externalDragStart, // jqui
                        sortstart: this.externalDragStart // jqui
                });
        },


        // Unbinds DOM handlers from elements that reside outside the grid
        unbindGlobalHandlers: function() {
                this.stopListeningTo($(document));
        },


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

                // prevent a user's clickaway for unselecting a range or an event from
                // causing a dayClick or starting an immediate new selection.
                if (view.isSelected || view.selectedEvent) {
                        return;
                }

                this.dayClickListener.startInteraction(ev);

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


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

                // prevent a user's clickaway for unselecting a range or an event from
                // causing a dayClick or starting an immediate new selection.
                if (view.isSelected || view.selectedEvent) {
                        return;
                }

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

                this.dayClickListener.startInteraction(ev);

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


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

                var dragListener = new HitDragListener(this, {
                        scroll: view.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) {
                                if (!isCancelled && dayClickHit) {
                                        view.triggerDayClick(
                                                _this.getHitSpan(dayClickHit),
                                                _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;
        },


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

                var dragListener = new HitDragListener(this, {
                        scroll: view.opt('dragScroll'),
                        interactionStart: function() {
                                selectionSpan = null;
                        },
                        dragStart: function() {
                                view.unselect(); // since we could be rendering a new selection, we want to clear any old one
                        },
                        hitOver: function(hit, isOrig, origHit) {
                                if (origHit) { // click needs to have started on a hit

                                        selectionSpan = _this.computeSelection(
                                                _this.getHitSpan(origHit),
                                                _this.getHitSpan(hit)
                                        );

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

                return dragListener;
        },


        // 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
                }
        },


        /* Event Helper
        ------------------------------------------------------------------------------------------------------------------*/
        // TODO: should probably move this to Grid.events, like we did event dragging / resizing


        // Renders a mock event at the given event location, which contains zoned start/end properties.
        // Returns all mock event elements.
        renderEventLocationHelper: function(eventLocation, sourceSeg) {
                var fakeEvent = this.fabricateHelperEvent(eventLocation, sourceSeg);

                return this.renderHelper(fakeEvent, sourceSeg); // do the actual rendering
        },


        // Builds a fake event given zoned event date properties and a segment is should be inspired from.
        // The range's end can be null, in which case the mock event that is rendered will have a null end time.
        // `sourceSeg` is the internal segment object involved in the drag. If null, something external is dragging.
        fabricateHelperEvent: function(eventLocation, sourceSeg) {
                var fakeEvent = sourceSeg ? createObject(sourceSeg.event) : {}; // mask the original event object if possible

                fakeEvent.start = eventLocation.start.clone();
                fakeEvent.end = eventLocation.end ? eventLocation.end.clone() : null;
                fakeEvent.allDay = null; // force it to be freshly computed by normalizeEventDates
                this.view.calendar.normalizeEventDates(fakeEvent);

                // this extra className will be useful for differentiating real events from mock events in CSS
                fakeEvent.className = (fakeEvent.className || []).concat('fc-helper');

                // if something external is being dragged in, don't render a resizer
                if (!sourceSeg) {
                        fakeEvent.editable = false;
                }

                return fakeEvent;
        },


        // Renders a mock event. Given zoned event date properties.
        // Must return all mock event elements.
        renderHelper: function(eventLocation, sourceSeg) {
                // subclasses must implement
        },


        // Unrenders a mock event
        unrenderHelper: function() {
                // subclasses must implement
        },


        /* Selection
        ------------------------------------------------------------------------------------------------------------------*/


        // 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)
        renderSelection: function(span) {
                this.renderHighlight(span);
        },


        // 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 renderSelection().
        // 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(span0, span1) {
                var span = this.computeSelectionSpan(span0, span1);

                if (span && !this.view.calendar.isSelectionSpanAllowed(span)) {
                        return false;
                }

                return span;
        },


        // Given two spans, must return the combination of the two.
        // TODO: do this separation of concerns (combining VS validation) for event dnd/resize too.
        computeSelectionSpan: function(span0, span1) {
                var dates = [ span0.start, span0.end, span1.start, span1.end ];

                dates.sort(compareNumbers); // sorts chronologically. works with Moments

                return { start: dates[0].clone(), end: dates[3].clone() };
        },


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


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


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


        // Generates an array of classNames for rendering the highlight. Used by the fill system.
        highlightSegClasses: function() {
                return [ 'fc-highlight' ];
        },


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


        renderBusinessHours: function() {
        },


        unrenderBusinessHours: function() {
        },


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


        getNowIndicatorUnit: function() {
        },


        renderNowIndicator: function(date) {
        },


        unrenderNowIndicator: function() {
        },


        /* Fill System (highlight, background events, business hours)
        --------------------------------------------------------------------------------------------------------------------
        TODO: remove this system. like we did in TimeGrid
        */


        // 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 + '"' : '') +
                        ' />';
        },



        /* Generic rendering utilities for subclasses
        ------------------------------------------------------------------------------------------------------------------*/


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

                if (
                        view.intervalDuration.as('months') == 1 &&
                        date.month() != view.intervalStart.month()
                ) {
                        classes.push('fc-other-month');
                }

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

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

                return classes;
        }

});

;;

/* Event-rendering and event-interaction methods for the abstract Grid class
----------------------------------------------------------------------------------------------------------------------*/

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
        isDraggingSeg: false, // is a segment being dragged? boolean
        isResizingSeg: false, // is a segment being resized? boolean
        isDraggingExternal: false, // jqui-dragging an external element? boolean
        segs: null, // the *event* segments currently rendered in the grid. TODO: rename to `eventSegs`


        // Renders the given events onto the grid
        renderEvents: function(events) {
                var bgEvents = [];
                var fgEvents = [];
                var i;

                for (i = 0; i < events.length; i++) {
                        (isBgEvent(events[i]) ? bgEvents : fgEvents).push(events[i]);
                }

                this.segs = [].concat( // record all segs
                        this.renderBgEvents(bgEvents),
                        this.renderFgEvents(fgEvents)
                );
        },


        renderBgEvents: function(events) {
                var segs = this.eventsToSegs(events);

                // renderBgSegs might return a subset of segs, segs that were actually rendered
                return this.renderBgSegs(segs) || segs;
        },


        renderFgEvents: function(events) {
                var segs = this.eventsToSegs(events);

                // renderFgSegs might return a subset of segs, segs that were actually rendered
                return this.renderFgSegs(segs) || segs;
        },


        // 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 || [];
        },


        /* 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 view = this.view;
                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 = view.resolveEventEl(seg.event, $(node));

                                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
        },


        /* Background Segment Rendering
        ------------------------------------------------------------------------------------------------------------------*/


        // 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.view.resolveEventEl(seg.event, el); // will filter through eventRender
        },


        // Generates an array of classNames to be used for the default rendering of a background event.
        // Called by fillSegHtml.
        bgEventSegClasses: function(seg) {
                var event = seg.event;
                var source = event.source || {};

                return [ 'fc-bgevent' ].concat(
                        event.className,
                        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']
                };
        },


        // 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' ];
        },


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


        // Compute business hour segs for the grid's current date range.
        // Caller must ask if whole-day business hours are needed.
        // If no `businessHours` configuration value is specified, assumes the calendar default.
        buildBusinessHourSegs: function(wholeDay, businessHours) {
                return this.eventsToSegs(
                        this.buildBusinessHourEvents(wholeDay, businessHours)
                );
        },


        // Compute business hour *events* for the grid's current date range.
        // Caller must ask if whole-day business hours are needed.
        // If no `businessHours` configuration value is specified, assumes the calendar default.
        buildBusinessHourEvents: function(wholeDay, businessHours) {
                var calendar = this.view.calendar;
                var events;

                if (businessHours == null) {
                        // fallback
                        // access from calendawr. don't access from view. doesn't update with dynamic options.
                        businessHours = calendar.options.businessHours;
                }

                events = calendar.computeBusinessHourEvents(wholeDay, businessHours);

                // HACK. Eventually refactor business hours "events" system.
                // If no events are given, but businessHours is activated, this means the entire visible range should be
                // marked as *not* business-hours, via inverse-background rendering.
                if (!events.length && businessHours) {
                        events = [
                                $.extend({}, BUSINESS_HOUR_EVENT_DEFAULTS, {
                                        start: this.view.end, // guaranteed out-of-range
                                        end: this.view.end,   // "
                                        dow: null
                                })
                        ];
                }

                return events;
        },


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


        // 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::renderEvents

                        // 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.view.publiclyTrigger('eventClick', seg.el[0], seg.event, ev); // can return `false` to cancel
                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.isEventResizable(seg.event)) {
                                seg.el.addClass('fc-allow-mouse-resize');
                        }
                        this.view.publiclyTrigger('eventMouseover', seg.el[0], seg.event, ev);
                }
        },


        // 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.isEventResizable(seg.event)) {
                                seg.el.removeClass('fc-allow-mouse-resize');
                        }
                        this.view.publiclyTrigger('eventMouseout', seg.el[0], seg.event, ev);
                }
        },


        handleSegMousedown: function(seg, ev) {
                var isResizing = this.startSegResize(seg, ev, { distance: 5 });

                if (!isResizing && this.view.isEventDraggable(seg.event)) {
                        this.buildSegDragListener(seg)
                                .startInteraction(ev, {
                                        distance: 5
                                });
                }
        },


        handleSegTouchStart: function(seg, ev) {
                var view = this.view;
                var event = seg.event;
                var isSelected = view.isEventSelected(event);
                var isDraggable = view.isEventDraggable(event);
                var isResizable = view.isEventResizable(event);
                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 = view.opt('eventLongPressDelay');
                        if (eventLongPressDelay == null) {
                                eventLongPressDelay = view.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
                        });
                }
        },


        // 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;
        },



        /* Event Dragging
        ------------------------------------------------------------------------------------------------------------------*/


        // 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 el = seg.el;
                var event = seg.event;
                var isDragging;
                var mouseFollower; // A clone of the original element that will move with the mouse
                var dropLocation; // zoned event date properties

                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: view.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 : view.opt('dragOpacity'),
                                        revertDuration: view.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.isEventSelected(event)) {
                                        // if not previously selected, will fire after a delay. then, select the event
                                        view.selectEvent(event);
                                }
                                isDragging = true;
                                _this.handleSegMouseout(seg, ev); // ensure a mouseout on the manipulated event has been reported
                                _this.segDragStart(seg, ev);
                                view.hideEvent(event); // hide all event segments. our mouseFollower will take over
                        },
                        hitOver: function(hit, isOrig, origHit) {
                                var dragHelperEls;

                                // starting hit could be forced (DayGrid.limit)
                                if (seg.hit) {
                                        origHit = seg.hit;
                                }

                                // since we are querying the parent view, might not belong to this grid
                                dropLocation = _this.computeEventDrop(
                                        origHit.component.getHitSpan(origHit),
                                        hit.component.getHitSpan(hit),
                                        event
                                );

                                if (dropLocation && !calendar.isEventSpanAllowed(_this.eventToSpan(dropLocation), event)) {
                                        disableCursor();
                                        dropLocation = null;
                                }

                                // if a valid drop location, have the subclass render a visual indication
                                if (dropLocation && (dragHelperEls = view.renderDrag(dropLocation, 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) {
                                        dropLocation = null; // needs to have moved hits to be a valid drop
                                }
                        },
                        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
                                dropLocation = 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(!dropLocation, function() {
                                        if (isDragging) {
                                                view.unrenderDrag();
                                                _this.segDragStop(seg, ev);
                                        }

                                        if (dropLocation) {
                                                // no need to re-show original, will rerender all anyways. esp important if eventRenderWait
                                                view.reportSegDrop(seg, dropLocation, _this.largeUnit, el, ev);
                                        }
                                        else {
                                                view.showEvent(event);
                                        }
                                });
                                _this.segDragListener = null;
                        }
                });

                return dragListener;
        },


        // 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 event = seg.event;

                if (this.segDragListener) {
                        return this.segDragListener;
                }

                var dragListener = this.segDragListener = new DragListener({
                        dragStart: function(ev) {
                                if (dragListener.isTouch && !view.isEventSelected(event)) {
                                        // if not previously selected, will fire after a delay. then, select the event
                                        view.selectEvent(event);
                                }
                        },
                        interactionEnd: function(ev) {
                                _this.segDragListener = null;
                        }
                });

                return dragListener;
        },


        // Called before event segment dragging starts
        segDragStart: function(seg, ev) {
                this.isDraggingSeg = true;
                this.view.publiclyTrigger('eventDragStart', seg.el[0], seg.event, ev, {}); // last argument is jqui dummy
        },


        // Called after event segment dragging stops
        segDragStop: function(seg, ev) {
                this.isDraggingSeg = false;
                this.view.publiclyTrigger('eventDragStop', seg.el[0], seg.event, ev, {}); // last argument is jqui dummy
        },


        // Given the spans an event drag began, and the span event was dropped, calculates the new zoned start/end/allDay
        // values for the event. Subclasses may override and set additional properties to be used by renderDrag.
        // A falsy returned value indicates an invalid drop.
        // DOES NOT consider overlap/constraint.
        computeEventDrop: function(startSpan, endSpan, event) {
                var calendar = this.view.calendar;
                var dragStart = startSpan.start;
                var dragEnd = endSpan.start;
                var delta;
                var dropLocation; // zoned event date properties

                if (dragStart.hasTime() === dragEnd.hasTime()) {
                        delta = this.diffDates(dragEnd, dragStart);

                        // if an all-day event was in a timed area and it was dragged to a different time,
                        // guarantee an end and adjust start/end to have times
                        if (event.allDay && durationHasTime(delta)) {
                                dropLocation = {
                                        start: event.start.clone(),
                                        end: calendar.getEventEnd(event), // will be an ambig day
                                        allDay: false // for normalizeEventTimes
                                };
                                calendar.normalizeEventTimes(dropLocation);
                        }
                        // othewise, work off existing values
                        else {
                                dropLocation = pluckEventDateProps(event);
                        }

                        dropLocation.start.add(delta);
                        if (dropLocation.end) {
                                dropLocation.end.add(delta);
                        }
                }
                else {
                        // if switching from day <-> timed, start should be reset to the dropped date, and the end cleared
                        dropLocation = {
                                start: dragEnd.clone(),
                                end: null, // end should be cleared
                                allDay: !dragEnd.hasTime()
                        };
                }

                return dropLocation;
        },


        // Utility for apply dragOpacity to a jQuery set
        applyDragOpacity: function(els) {
                var opacity = this.view.opt('dragOpacity');

                if (opacity != null) {
                        els.css('opacity', opacity);
                }
        },


        /* External Element Dragging
        ------------------------------------------------------------------------------------------------------------------*/


        // Called when a jQuery UI drag is initiated anywhere in the DOM
        externalDragStart: function(ev, ui) {
                var view = this.view;
                var el;
                var accept;

                if (view.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 = view.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 calendar = this.view.calendar;
                var meta = getDraggedElMeta(el); // extra data about event drop, including possible event to create
                var dropLocation; // 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) {
                                dropLocation = _this.computeExternalDrop(
                                        hit.component.getHitSpan(hit), // since we are querying the parent view, might not belong to this grid
                                        meta
                                );

                                if ( // invalid hit?
                                        dropLocation &&
                                        !calendar.isExternalSpanAllowed(_this.eventToSpan(dropLocation), dropLocation, meta.eventProps)
                                ) {
                                        disableCursor();
                                        dropLocation = null;
                                }

                                if (dropLocation) {
                                        _this.renderDrag(dropLocation); // called without a seg parameter
                                }
                        },
                        hitOut: function() {
                                dropLocation = null; // signal unsuccessful
                        },
                        hitDone: function() { // Called after a hitOut OR before a dragEnd
                                enableCursor();
                                _this.unrenderDrag();
                        },
                        interactionEnd: function(ev) {
                                if (dropLocation) { // element was dropped on a valid hit
                                        _this.view.reportExternalDrop(meta, dropLocation, 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.
        computeExternalDrop: function(span, meta) {
                var calendar = this.view.calendar;
                var dropLocation = {
                        start: calendar.applyTimezone(span.start), // simulate a zoned event start date
                        end: null
                };

                // if dropped on an all-day span, and element's metadata specified a time, set it
                if (meta.startTime && !dropLocation.start.hasTime()) {
                        dropLocation.start.time(meta.startTime);
                }

                if (meta.duration) {
                        dropLocation.end = dropLocation.start.clone().add(meta.duration);
                }

                return dropLocation;
        },



        /* Drag Rendering (for both events and an external elements)
        ------------------------------------------------------------------------------------------------------------------*/


        // Renders a visual indication of an event or external element being dragged.
        // `dropLocation` contains hypothetical start/end/allDay values the event would have if dropped. end can be null.
        // `seg` is the internal segment object that is being dragged. If dragging an external element, `seg` is null.
        // A truthy returned value indicates this method has rendered a helper element.
        // Must return elements used for any mock events.
        renderDrag: function(dropLocation, seg) {
                // subclasses must implement
        },


        // Unrenders a visual indication of an event or external element being dragged
        unrenderDrag: function() {
                // subclasses must implement
        },


        /* Resizing
        ------------------------------------------------------------------------------------------------------------------*/


        // 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 el = seg.el;
                var event = seg.event;
                var eventEnd = calendar.getEventEnd(event);
                var isDragging;
                var resizeLocation; // 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: view.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 origHitSpan = _this.getHitSpan(origHit);
                                var hitSpan = _this.getHitSpan(hit);

                                resizeLocation = isStart ?
                                        _this.computeEventStartResize(origHitSpan, hitSpan, event) :
                                        _this.computeEventEndResize(origHitSpan, hitSpan, event);

                                if (resizeLocation) {
                                        if (!calendar.isEventSpanAllowed(_this.eventToSpan(resizeLocation), event)) {
                                                disableCursor();
                                                resizeLocation = null;
                                        }
                                        // no change? (FYI, event dates might have zones)
                                        else if (
                                                resizeLocation.start.isSame(event.start.clone().stripZone()) &&
                                                resizeLocation.end.isSame(eventEnd.clone().stripZone())
                                        ) {
                                                resizeLocation = null;
                                        }
                                }

                                if (resizeLocation) {
                                        view.hideEvent(event);
                                        _this.renderEventResize(resizeLocation, seg);
                                }
                        },
                        hitOut: function() { // called before mouse moves to a different hit OR moved out of all hits
                                resizeLocation = null;
                                view.showEvent(event); // 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 (resizeLocation) { // valid date to resize to?
                                        // no need to re-show original, will rerender all anyways. esp important if eventRenderWait
                                        view.reportSegResize(seg, resizeLocation, _this.largeUnit, el, ev);
                                }
                                else {
                                        view.showEvent(event);
                                }
                                _this.segResizeListener = null;
                        }
                });

                return dragListener;
        },


        // Called before event segment resizing starts
        segResizeStart: function(seg, ev) {
                this.isResizingSeg = true;
                this.view.publiclyTrigger('eventResizeStart', seg.el[0], seg.event, ev, {}); // last argument is jqui dummy
        },


        // Called after event segment resizing stops
        segResizeStop: function(seg, ev) {
                this.isResizingSeg = false;
                this.view.publiclyTrigger('eventResizeStop', seg.el[0], seg.event, ev, {}); // last argument is jqui dummy
        },


        // Returns new date-information for an event segment being resized from its start
        computeEventStartResize: function(startSpan, endSpan, event) {
                return this.computeEventResize('start', startSpan, endSpan, event);
        },


        // Returns new date-information for an event segment being resized from its end
        computeEventEndResize: function(startSpan, endSpan, event) {
                return this.computeEventResize('end', startSpan, endSpan, event);
        },


        // Returns new zoned date information for an event segment being resized from its start OR end
        // `type` is either 'start' or 'end'.
        // DOES NOT consider overlap/constraint.
        computeEventResize: function(type, startSpan, endSpan, event) {
                var calendar = this.view.calendar;
                var delta = this.diffDates(endSpan[type], startSpan[type]);
                var resizeLocation; // zoned event date properties
                var defaultDuration;

                // build original values to work from, guaranteeing a start and end
                resizeLocation = {
                        start: event.start.clone(),
                        end: calendar.getEventEnd(event),
                        allDay: event.allDay
                };

                // if an all-day event was in a timed area and was resized to a time, adjust start/end to have times
                if (resizeLocation.allDay && durationHasTime(delta)) {
                        resizeLocation.allDay = false;
                        calendar.normalizeEventTimes(resizeLocation);
                }

                resizeLocation[type].add(delta); // apply delta to start or end

                // if the event was compressed too small, find a new reasonable duration for it
                if (!resizeLocation.start.isBefore(resizeLocation.end)) {

                        defaultDuration =
                                this.minResizeDuration || // TODO: hack
                                (event.allDay ?
                                        calendar.defaultAllDayEventDuration :
                                        calendar.defaultTimedEventDuration);

                        if (type == 'start') { // resizing the start?
                                resizeLocation.start = resizeLocation.end.clone().subtract(defaultDuration);
                        }
                        else { // resizing the end?
                                resizeLocation.end = resizeLocation.start.clone().add(defaultDuration);
                        }
                }

                return resizeLocation;
        },


        // Renders a visual indication of an event being resized.
        // `range` has the updated dates of the event. `seg` is the original segment object involved in the drag.
        // Must return elements used for any mock events.
        renderEventResize: function(range, seg) {
                // subclasses must implement
        },


        // Unrenders a visual indication of an event being resized.
        unrenderEventResize: function() {
                // subclasses must implement
        },


        /* 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(range, formatStr, displayEnd) {

                if (formatStr == null) {
                        formatStr = this.eventTimeFormat;
                }

                if (displayEnd == null) {
                        displayEnd = this.displayEventEnd;
                }

                if (this.displayEventTime && range.start.hasTime()) {
                        if (displayEnd && range.end) {
                                return this.view.formatRange(range, formatStr);
                        }
                        else {
                                return range.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.isEventSelected(seg.event)) {
                        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 event = seg.event;

                return [].concat(
                        event.className, // guaranteed to be an array
                        event.source ? event.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) {
                return seg.event.backgroundColor ||
                        seg.event.color ||
                        this.getSegDefaultBackgroundColor(seg);
        },


        getSegDefaultBackgroundColor: function(seg) {
                var source = seg.event.source || {};

                return source.backgroundColor ||
                        source.color ||
                        this.view.opt('eventBackgroundColor') ||
                        this.view.opt('eventColor');
        },


        // Queries for caller-specified color, then falls back to default
        getSegBorderColor: function(seg) {
                return seg.event.borderColor ||
                        seg.event.color ||
                        this.getSegDefaultBorderColor(seg);
        },


        getSegDefaultBorderColor: function(seg) {
                var source = seg.event.source || {};

                return source.borderColor ||
                        source.color ||
                        this.view.opt('eventBorderColor') ||
                        this.view.opt('eventColor');
        },


        // Queries for caller-specified color, then falls back to default
        getSegTextColor: function(seg) {
                return seg.event.textColor ||
                        this.getSegDefaultTextColor(seg);
        },


        getSegDefaultTextColor: function(seg) {
                var source = seg.event.source || {};

                return source.textColor ||
                        this.view.opt('eventTextColor');
        },


        /* Converting events -> eventRange -> eventSpan -> eventSegs
        ------------------------------------------------------------------------------------------------------------------*/


        // Generates an array of segments for the given single event
        // Can accept an event "location" as well (which only has start/end and no allDay)
        eventToSegs: function(event) {
                return this.eventsToSegs([ event ]);
        },


        eventToSpan: function(event) {
                return this.eventToSpans(event)[0];
        },


        // Generates spans (always unzoned) for the given event.
        // Does not do any inverting for inverse-background events.
        // Can accept an event "location" as well (which only has start/end and no allDay)
        eventToSpans: function(event) {
                var range = this.eventToRange(event);
                return this.eventRangeToSpans(range, event);
        },



        // Converts an array of event objects into an array of event segment objects.
        // A custom `segSliceFunc` may be given for arbitrarily slicing up events.
        // Doesn't guarantee an order for the resulting array.
        eventsToSegs: function(allEvents, segSliceFunc) {
                var _this = this;
                var eventsById = groupEventsById(allEvents);
                var segs = [];

                $.each(eventsById, function(id, events) {
                        var ranges = [];
                        var i;

                        for (i = 0; i < events.length; i++) {
                                ranges.push(_this.eventToRange(events[i]));
                        }

                        // inverse-background events (utilize only the first event in calculations)
                        if (isInverseBgEvent(events[0])) {
                                ranges = _this.invertRanges(ranges);

                                for (i = 0; i < ranges.length; i++) {
                                        segs.push.apply(segs, // append to
                                                _this.eventRangeToSegs(ranges[i], events[0], segSliceFunc));
                                }
                        }
                        // normal event ranges
                        else {
                                for (i = 0; i < ranges.length; i++) {
                                        segs.push.apply(segs, // append to
                                                _this.eventRangeToSegs(ranges[i], events[i], segSliceFunc));
                                }
                        }
                });

                return segs;
        },


        // Generates the unzoned start/end dates an event appears to occupy
        // Can accept an event "location" as well (which only has start/end and no allDay)
        eventToRange: function(event) {
                var calendar = this.view.calendar;
                var start = event.start.clone().stripZone();
                var end = (
                                event.end ?
                                        event.end.clone() :
                                        // derive the end from the start and allDay. compute allDay if necessary
                                        calendar.getDefaultEventEnd(
                                                event.allDay != null ?
                                                        event.allDay :
                                                        !event.start.hasTime(),
                                                event.start
                                        )
                        ).stripZone();

                // hack: dynamic locale change forgets to upate stored event localed
                calendar.localizeMoment(start);
                calendar.localizeMoment(end);

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


        // Given an event's range (unzoned start/end), and the event itself,
        // slice into segments (using the segSliceFunc function if specified)
        eventRangeToSegs: function(range, event, segSliceFunc) {
                var spans = this.eventRangeToSpans(range, event);
                var segs = [];
                var i;

                for (i = 0; i < spans.length; i++) {
                        segs.push.apply(segs, // append to
                                this.eventSpanToSegs(spans[i], event, segSliceFunc));
                }

                return segs;
        },


        // Given an event's unzoned date range, return an array of "span" objects.
        // Subclasses can override.
        eventRangeToSpans: function(range, event) {
                return [ $.extend({}, range) ]; // copy into a single-item array
        },


        // 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.
        eventSpanToSegs: function(span, event, segSliceFunc) {
                var segs = segSliceFunc ? segSliceFunc(span) : this.spanToSegs(span);
                var i, seg;

                for (i = 0; i < segs.length; i++) {
                        seg = segs[i];
                        seg.event = event;
                        seg.eventStartMS = +span.start; // TODO: not the best name after making spans unzoned
                        seg.eventDurationMS = span.end - span.start;
                }

                return segs;
        },


        // Produces a new array of range objects that will cover all the time NOT covered by the given ranges.
        // SIDE EFFECT: will mutate the given array and will use its date references.
        invertRanges: function(ranges) {
                var view = this.view;
                var viewStart = view.start.clone(); // need a copy
                var viewEnd = view.end.clone(); // need a copy
                var inverseRanges = [];
                var start = viewStart; // the end of the previous range. the start of the new range
                var i, range;

                // ranges need to be in order. required for our date-walking algorithm
                ranges.sort(compareRanges);

                for (i = 0; i < ranges.length; i++) {
                        range = ranges[i];

                        // add the span of time before the event (if there is any)
                        if (range.start > start) { // compare millisecond time (skip any ambig logic)
                                inverseRanges.push({
                                        start: start,
                                        end: range.start
                                });
                        }

                        start = range.end;
                }

                // add the span of time after the last event (if there is any)
                if (start < viewEnd) { // compare millisecond time (skip any ambig logic)
                        inverseRanges.push({
                                start: start,
                                end: viewEnd
                        });
                }

                return inverseRanges;
        },


        sortEventSegs: function(segs) {
                segs.sort(proxy(this, 'compareEventSegs'));
        },


        // A cmp function for determining which segments should take visual priority
        compareEventSegs: function(seg1, seg2) {
                return seg1.eventStartMS - seg2.eventStartMS || // earlier events go first
                        seg2.eventDurationMS - seg1.eventDurationMS || // tie? longer events go first
                        seg2.event.allDay - seg1.event.allDay || // tie? put all-day events first (booleans cast to 0/1)
                        compareByFieldSpecs(seg1.event, seg2.event, this.view.eventOrderSpecs);
        }

});


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


function pluckEventDateProps(event) {
        return {
                start: event.start.clone(),
                end: event.end ? event.end.clone() : null,
                allDay: event.allDay // keep it the same
        };
}
FC.pluckEventDateProps = pluckEventDateProps;


function isBgEvent(event) { // returns true if background OR inverse-background
        var rendering = getEventRendering(event);
        return rendering === 'background' || rendering === 'inverse-background';
}
FC.isBgEvent = isBgEvent; // export


function isInverseBgEvent(event) {
        return getEventRendering(event) === 'inverse-background';
}


function getEventRendering(event) {
        return firstDefined((event.source || {}).rendering, event.rendering);
}


function groupEventsById(events) {
        var eventsById = {};
        var i, event;

        for (i = 0; i < events.length; i++) {
                event = events[i];
                (eventsById[event._id] || (eventsById[event._id] = [])).push(event);
        }

        return eventsById;
}


// A cmp function for determining which non-inverted "ranges" (see above) happen earlier
function compareRanges(range1, range2) {
        return range1.start - range2.start; // earlier ranges go first
}


/* 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 };
}


;;

/*
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 date = this.start.clone();
                var dayIndex = -1;
                var dayIndices = [];
                var dayDates = [];
                var daysPerRow;
                var firstDay;
                var rowCnt;

                while (date.isBefore(this.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.view.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.start, '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.view.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(range) {
                var daysPerRow = this.daysPerRow;
                var normalRange = this.view.computeDayRange(range); // 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(range) {
                var daysPerRow = this.daysPerRow;
                var normalRange = this.view.computeDayRange(range); // 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 view = this.view;

                return '' +
                        '<div class="fc-row ' + view.widgetHeaderClass + '">' +
                                '<table>' +
                                        '<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 classNames = [
                        'fc-day-header',
                        view.widgetHeaderClass
                ];

                // 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(' ') + '"' +
                                (this.rowCnt === 1 ?
                                        ' data-date="' + date.format('YYYY-MM-DD') + '"' :
                                        '') +
                                (colspan > 1 ?
                                        ' colspan="' + colspan + '"' :
                                        '') +
                                (otherAttrs ?
                                        ' ' + otherAttrs :
                                        '') +
                                '>' +
                                // 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 },
                                        htmlEscape(date.format(this.colHeadFormat)) // inner HTML
                                ) +
                        '</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 classes = this.getDayClasses(date);

                classes.unshift('fc-day', view.widgetContentClass);

                return '<td class="' + classes.join(' ') + '"' +
                        ' 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');

                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++) {
                                view.publiclyTrigger(
                                        'dayRender',
                                        null,
                                        this.getCellDate(row, col),
                                        this.getCellEl(row, col)
                                );
                        }
                }
        },


        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 view = this.view;
                var classes = [ 'fc-row', 'fc-week', view.widgetContentClass ];

                if (isRigid) {
                        classes.push('fc-rigid');
                }

                return '' +
                        '<div class="' + classes.join(' ') + '">' +
                                '<div class="fc-bg">' +
                                        '<table>' +
                                                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 html = '';
                var classes;
                var weekCalcFirstDoW;

                if (!this.view.dayNumbersVisible && !this.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 (this.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(' ') + '" data-date="' + date.format() + '">';

                if (this.view.cellWeekNumbersVisible && (date.day() == weekCalcFirstDoW)) {
                        html += this.view.buildGotoAnchorHtml(
                                { date: date, type: 'week' },
                                { 'class': 'fc-week-number' },
                                date.format('w') // inner HTML
                        );
                }

                if (this.view.dayNumbersVisible) {
                        html += this.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.view.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
        spanToSegs: function(span) {
                var segs = this.sliceRangeByRow(span);
                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);
                        }
                }
        },


        getHitSpan: function(hit) {
                return this.getCellRange(hit.row, hit.col);
        },


        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(eventLocation, seg) {

                // always render a highlight underneath
                this.renderHighlight(this.eventToSpan(eventLocation));

                // if a segment from the same calendar but another component is being dragged, render a helper event
                if (seg && seg.component !== this) {
                        return this.renderEventLocationHelper(eventLocation, 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(eventLocation, seg) {
                this.renderHighlight(this.eventToSpan(eventLocation));
                return this.renderEventLocationHelper(eventLocation, 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.
        renderHelper: function(event, sourceSeg) {
                var helperNodes = [];
                var segs = this.eventToSegs(event);
                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]);
                }

                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.event.allDay;
                });

                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 event = seg.event;
                var isDraggable = view.isEventDraggable(event);
                var isResizableFromStart = !disableResizing && event.allDay &&
                        seg.isStart && view.isEventResizableFromStart(event);
                var isResizableFromEnd = !disableResizing && event.allDay &&
                        seg.isEnd && view.isEventResizableFromEnd(event);
                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(event);
                        if (timeText) {
                                timeHtml = '<span class="fc-time">' + htmlEscape(timeText) + '</span>';
                        }
                }

                titleHtml =
                        '<span class="fc-title">' +
                                (htmlEscape(event.title || '') || '&nbsp;') + // we always want one line of height
                        '</span>';
                
                return '<a class="' + classes.join(' ') + '"' +
                                (event.url ?
                                        ' href="' + htmlEscape(event.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 = view.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 = view.publiclyTrigger('eventLimitClick', null, {
                                                date: date,
                                                dayEl: dayEl,
                                                moreEl: moreEl,
                                                segs: reslicedAllSegs,
                                                hiddenSegs: reslicedHiddenSegs
                                        }, ev);
                                }

                                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',
                        content: this.renderSegPopoverContent(row, col, segs),
                        parentEl: this.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: view.opt('popoverViewportConstrain'),
                        hide: function() {
                                // kill everything when the popover is hidden
                                // notify events to be removed
                                if (_this.popoverSegs) {
                                        var seg;
                                        for (var i = 0; i < _this.popoverSegs.length; ++i) {
                                                seg = _this.popoverSegs[i];
                                                view.publiclyTrigger('eventDestroy', seg.event, seg.event, seg.el);
                                        }
                                }
                                _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 isTheme = view.opt('theme');
                var title = this.getCellDate(row, col).format(view.opt('dayPopoverFormat'));
                var content = $(
                        '<div class="fc-header ' + view.widgetHeaderClass + '">' +
                                '<span class="fc-close ' +
                                        (isTheme ? 'ui-icon ui-icon-closethick' : 'fc-icon fc-icon-x') +
                                '"></span>' +
                                '<span class="fc-title">' +
                                        htmlEscape(title) +
                                '</span>' +
                                '<div class="fc-clear"/>' +
                        '</div>' +
                        '<div class="fc-body ' + view.widgetContentClass + '">' +
                                '<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) {

                // build an array of the original events
                var events = $.map(segs, function(seg) {
                        return seg.event;
                });

                var dayStart = dayDate.clone();
                var dayEnd = dayStart.clone().add(1, 'days');
                var dayRange = { start: dayStart, end: dayEnd };

                // slice the events with a custom slicing function
                segs = this.eventsToSegs(
                        events,
                        function(range) {
                                var seg = intersectRanges(range, dayRange); // undefind if no intersection
                                return seg ? [ seg ] : []; // must return an array of segments
                        }
                );

                // force an order because eventsToSegs doesn't guarantee one
                this.sortEventSegs(segs);

                return segs;
        },


        // Generates the text that should be inside a "more" link, given the number of events it represents
        getMoreLinkText: function(num) {
                var opt = this.view.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, {

        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,
        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
        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');
                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() {
                return '' +
                        '<div class="fc-bg">' +
                                '<table>' +
                                        this.renderBgTrHtml(0) + // row=0
                                '</table>' +
                        '</div>' +
                        '<div class="fc-slats">' +
                                '<table>' +
                                        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 isRTL = this.isRTL;
                var html = '';
                var slotTime = moment.duration(+this.minTime); // wish there was .clone() for durations
                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 < this.maxTime) {
                        slotDate = this.start.clone().time(slotTime);
                        isLabeled = isInt(divideDurationByDuration(slotTime, this.labelInterval));

                        axisHtml =
                                '<td class="fc-axis fc-time ' + view.widgetContentClass + '" ' + 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="' + view.widgetContentClass + '"/>' +
                                        (isRTL ? axisHtml : '') +
                                "</tr>";

                        slotTime.add(this.slotDuration);
                }

                return html;
        },


        /* Options
        ------------------------------------------------------------------------------------------------------------------*/


        // Parses various options into properties of this object
        processOptions: function() {
                var view = this.view;
                var slotDuration = view.opt('slotDuration');
                var snapDuration = view.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?

                this.minResizeDuration = snapDuration; // hack

                this.minTime = moment.duration(view.opt('minTime'));
                this.maxTime = moment.duration(view.opt('maxTime'));

                // might be an array value (for TimelineView).
                // if so, getting the most granular entry (the last one probably).
                input = view.opt('slotLabelFormat');
                if ($.isArray(input)) {
                        input = input[input.length - 1];
                }

                this.labelFormat =
                        input ||
                        view.opt('smallTimeFormat'); // the computed default

                input = view.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.view.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
                                };
                        }
                }
        },


        getHitSpan: 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 { start: start, end: end };
        },


        getHitEl: function(hit) {
                return this.colEls.eq(hit.col);
        },


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


        rangeUpdated: function() {
                this.updateDayTable();
        },


        // 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.minTime + this.snapDuration * snapIndex);
        },


        // Slices up the given span (unzoned start/end with other misc data) into an array of segments
        spanToSegs: function(span) {
                var segs = this.sliceRangeByTimes(span);
                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(range) {
                var segs = [];
                var seg;
                var dayIndex;
                var dayDate;
                var dayRange;

                for (dayIndex = 0; dayIndex < this.daysPerRow; dayIndex++) {
                        dayDate = this.dayDates[dayIndex].clone(); // TODO: better API for this?
                        dayRange = {
                                start: dayDate.clone().time(this.minTime),
                                end: dayDate.clone().time(this.maxTime)
                        };
                        seg = intersectRanges(range, dayRange); // both will be ambig timezone
                        if (seg) {
                                seg.dayIndex = dayIndex;
                                segs.push(seg);
                        }
                }

                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.
        // A `startOfDayDate` must be given for avoiding ambiguity over how to treat midnight.
        computeDateTop: function(date, startOfDayDate) {
                return this.computeTimeTop(
                        moment.duration(
                                date - 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.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(eventLocation, seg) {

                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.renderEventLocationHelper(eventLocation, seg);
                }
                else {
                        // otherwise, just render a highlight
                        this.renderHighlight(this.eventToSpan(eventLocation));
                }
        },


        // 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(eventLocation, seg) {
                return this.renderEventLocationHelper(eventLocation, 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)
        renderHelper: function(event, sourceSeg) {
                return this.renderHelperSegs(this.eventToSegs(event), sourceSeg); // returns mock event elements
        },


        // 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.spanToSegs({ start: date, end: date });
                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.
        renderSelection: function(span) {
                if (this.view.opt('selectHelper')) { // this setting signals that a mock helper event should be rendered

                        // normally acceps an eventLocation, span has a start/end, which is good enough
                        this.renderEventLocationHelper(span);
                }
                else {
                        this.renderHighlight(span);
                }
        },


        // Unrenders any visual indication of a selection
        unrenderSelection: function() {
                this.unrenderHelper();
                this.unrenderHighlight();
        },


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


        renderHighlight: function(span) {
                this.renderHighlightSegs(this.spanToSegs(span));
        },


        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: old fill system
                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: old fill system
                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 event = seg.event;
                var isDraggable = view.isEventDraggable(event);
                var isResizableFromStart = !disableResizing && seg.isStart && view.isEventResizableFromStart(event);
                var isResizableFromEnd = !disableResizing && seg.isEnd && view.isEventResizableFromEnd(event);
                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 (view.isMultiDayEvent(event)) { // if the event appears to span more than one day...
                        // 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) {
                                timeText = this.getEventTimeText(seg);
                                fullTimeText = this.getEventTimeText(seg, 'LT');
                                startTimeText = this.getEventTimeText(seg, null, false); // displayEnd=false
                        }
                } else {
                        // Display the normal time text for the *event's* times
                        timeText = this.getEventTimeText(event);
                        fullTimeText = this.getEventTimeText(event, 'LT');
                        startTimeText = this.getEventTimeText(event, null, false); // displayEnd=false
                }

                return '<a class="' + classes.join(' ') + '"' +
                        (event.url ?
                                ' href="' + htmlEscape(event.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>' :
                                                ''
                                                ) +
                                        (event.title ?
                                                '<div class="fc-title">' +
                                                        htmlEscape(event.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;

                for (i = 0; i < segs.length; i++) {
                        seg = segs[i];
                        seg.top = this.computeDateTop(seg.start, seg.start);
                        seg.bottom = this.computeDateTop(seg.end, seg.start);
                }
        },


        // 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.view.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 = Class.extend(EmitterMixin, ListenerMixin, {

        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
        options: null, // hash containing all options. already merged with view-specific-options
        el: null, // the view's containing element. set by Calendar

        isDateSet: false,
        isDateRendered: false,
        dateRenderQueue: null,

        isEventsBound: false,
        isEventsSet: false,
        isEventsRendered: false,
        eventRenderQueue: null,

        // range the view is actually displaying (moments)
        start: null,
        end: null, // exclusive

        // range the view is formally responsible for (moments)
        // may be different from start/end. for example, a month view might have 1st-31st, excluding padded dates
        intervalStart: null,
        intervalEnd: null, // exclusive
        intervalDuration: null,
        intervalUnit: null, // name of largest unit being displayed, like "month" or "week"

        isRTL: false,
        isSelected: false, // boolean whether a range of time is user-selected or not
        selectedEvent: null,

        eventOrderSpecs: null, // criteria for ordering events when they have same date/time

        // classNames styled by jqui themes
        widgetHeaderClass: null,
        widgetContentClass: null,
        highlightStateClass: null,

        // for date utils, computed from options
        nextDayThreshold: null,
        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, type, options, intervalDuration) {

                this.calendar = calendar;
                this.type = this.name = type; // .name is deprecated
                this.options = options;
                this.intervalDuration = intervalDuration || moment.duration(1, 'day');

                this.nextDayThreshold = moment.duration(this.opt('nextDayThreshold'));
                this.initThemingProps();
                this.initHiddenDays();
                this.isRTL = this.opt('isRTL');

                this.eventOrderSpecs = parseFieldSpecs(this.opt('eventOrder'));

                this.dateRenderQueue = new TaskQueue();
                this.eventRenderQueue = new TaskQueue(this.opt('eventRenderWait'));

                this.initialize();
        },


        // 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];
        },


        // Triggers handlers that are view-related. Modifies args before passing to calendar.
        publiclyTrigger: function(name, thisObj) { // arguments beyond thisObj are passed along
                var calendar = this.calendar;

                return calendar.publiclyTrigger.apply(
                        calendar,
                        [name, thisObj || this].concat(
                                Array.prototype.slice.call(arguments, 2), // arguments beyond thisObj
                                [ this ] // always make the last argument a reference to the view. TODO: deprecate
                        )
                );
        },


        // Returns a proxy of the given promise that will be rejected if the given event fires
        // before the promise resolves.
        rejectOn: function(eventName, promise) {
                var _this = this;

                return new Promise(function(resolve, reject) {
                        _this.one(eventName, reject);

                        function cleanup() {
                                _this.off(eventName, reject);
                        }

                        promise.then(function(res) { // success
                                cleanup();
                                resolve(res);
                        }, function() { // failure
                                cleanup();
                                reject();
                        });
                });
        },


        /* Date Computation
        ------------------------------------------------------------------------------------------------------------------*/


        // Updates all internal dates for displaying the given unzoned range.
        setRange: function(range) {
                $.extend(this, range); // assigns every property to this object's member variables
                this.updateTitle();
        },


        // Given a single current unzoned date, produce information about what range to display.
        // Subclasses can override. Must return all properties.
        computeRange: function(date) {
                var intervalUnit = computeIntervalUnit(this.intervalDuration);
                var intervalStart = date.clone().startOf(intervalUnit);
                var intervalEnd = intervalStart.clone().add(this.intervalDuration);
                var start, end;

                // normalize the range's time-ambiguity
                if (/year|month|week|day/.test(intervalUnit)) { // whole-days?
                        intervalStart.stripTime();
                        intervalEnd.stripTime();
                }
                else { // needs to have a time?
                        if (!intervalStart.hasTime()) {
                                intervalStart = this.calendar.time(0); // give 00:00 time
                        }
                        if (!intervalEnd.hasTime()) {
                                intervalEnd = this.calendar.time(0); // give 00:00 time
                        }
                }

                start = intervalStart.clone();
                start = this.skipHiddenDays(start);
                end = intervalEnd.clone();
                end = this.skipHiddenDays(end, -1, true); // exclusively move backwards

                return {
                        intervalUnit: intervalUnit,
                        intervalStart: intervalStart,
                        intervalEnd: intervalEnd,
                        start: start,
                        end: end
                };
        },


        // Computes the new date when the user hits the prev button, given the current date
        computePrevDate: function(date) {
                return this.massageCurrentDate(
                        date.clone().startOf(this.intervalUnit).subtract(this.intervalDuration), -1
                );
        },


        // Computes the new date when the user hits the next button, given the current date
        computeNextDate: function(date) {
                return this.massageCurrentDate(
                        date.clone().startOf(this.intervalUnit).add(this.intervalDuration)
                );
        },


        // Given an arbitrarily calculated current date of the calendar, returns a date that is ensured to be completely
        // visible. `direction` is optional and indicates which direction the current date was being
        // incremented or decremented (1 or -1).
        massageCurrentDate: function(date, direction) {
                if (this.intervalDuration.as('days') <= 1) { // if the view displays a single day or smaller
                        if (this.isHiddenDay(date)) {
                                date = this.skipHiddenDays(date, direction);
                                date.startOf('day');
                        }
                }

                return date;
        },


        /* Title and Date Formatting
        ------------------------------------------------------------------------------------------------------------------*/


        // Sets the view's title property to the most updated computed value
        updateTitle: function() {
                this.title = this.computeTitle();
                this.calendar.setToolbarsTitle(this.title);
        },


        // Computes what the title at the top of the calendar should be for this view
        computeTitle: function() {
                var start, end;

                // for views that span a large unit of time, show the proper interval, ignoring stray days before and after
                if (this.intervalUnit === 'year' || this.intervalUnit === 'month') {
                        start = this.intervalStart;
                        end = this.intervalEnd;
                }
                else { // for day units or smaller, use the actual day range
                        start = this.start;
                        end = this.end;
                }

                return this.formatRange(
                        {
                                // in case intervalStart/End has a time, make sure timezone is correct
                                start: this.calendar.applyTimezone(start),
                                end: this.calendar.applyTimezone(end)
                        },
                        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.intervalUnit == 'year') {
                        return 'YYYY';
                }
                else if (this.intervalUnit == 'month') {
                        return this.opt('monthYearFormat'); // like "September 2014"
                }
                else if (this.intervalDuration.as('days') > 1) {
                        return 'll'; // multi-day range. shorter, like "Sep 9 - 10 2014"
                }
                else {
                        return 'LL'; // one day. longer, like "September 9 2014"
                }
        },


        // 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, formatStr, separator) {
                var end = range.end;

                if (!end.hasTime()) { // all-day?
                        end = end.clone().subtract(1); // convert to inclusive. last ms of previous day
                }

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


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


        /* 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>';
                }
        },


        // Rendering Non-date-related Content
        // -----------------------------------------------------------------------------------------------------------------


        // 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.unsetDate();
                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.
        },


        // 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 Setting/Unsetting
        // -----------------------------------------------------------------------------------------------------------------


        setDate: function(date) {
                var isReset = this.isDateSet;

                this.isDateSet = true;
                this.handleDate(date, isReset);
                this.trigger(isReset ? 'dateReset' : 'dateSet', date);
        },


        unsetDate: function() {
                if (this.isDateSet) {
                        this.isDateSet = false;
                        this.handleDateUnset();
                        this.trigger('dateUnset');
                }
        },


        // Date Handling
        // -----------------------------------------------------------------------------------------------------------------


        handleDate: function(date, isReset) {
                var _this = this;

                this.unbindEvents(); // will do nothing if not already bound
                this.requestDateRender(date).then(function() {
                        // wish we could start earlier, but setRange/computeRange needs to execute first
                        _this.bindEvents(); // will request events
                });
        },


        handleDateUnset: function() {
                this.unbindEvents();
                this.requestDateUnrender();
        },


        // Date Render Queuing
        // -----------------------------------------------------------------------------------------------------------------


        // if date not specified, uses current
        requestDateRender: function(date) {
                var _this = this;

                return this.dateRenderQueue.add(function() {
                        return _this.executeDateRender(date);
                });
        },


        requestDateUnrender: function() {
                var _this = this;

                return this.dateRenderQueue.add(function() {
                        return _this.executeDateUnrender();
                });
        },


        // Date High-level Rendering
        // -----------------------------------------------------------------------------------------------------------------


        // if date not specified, uses current
        executeDateRender: function(date) {
                var _this = this;

                // if rendering a new date, reset scroll to initial state (scrollTime)
                if (date) {
                        this.captureInitialScroll();
                }
                else {
                        this.captureScroll(); // a rerender of the current date
                }

                this.freezeHeight();

                return this.executeDateUnrender().then(function() {

                        if (date) {
                                _this.setRange(_this.computeRange(date));
                        }

                        if (_this.render) {
                                _this.render(); // TODO: deprecate
                        }

                        _this.renderDates();
                        _this.updateSize();
                        _this.renderBusinessHours(); // might need coordinates, so should go after updateSize()
                        _this.startNowIndicator();

                        _this.thawHeight();
                        _this.releaseScroll();

                        _this.isDateRendered = true;
                        _this.onDateRender();
                        _this.trigger('dateRender');
                });
        },


        executeDateUnrender: function() {
                var _this = this;

                if (_this.isDateRendered) {
                        return this.requestEventsUnrender().then(function() {

                                _this.unselect();
                                _this.stopNowIndicator();
                                _this.triggerUnrender();
                                _this.unrenderBusinessHours();
                                _this.unrenderDates();

                                if (_this.destroy) {
                                        _this.destroy(); // TODO: deprecate
                                }

                                _this.isDateRendered = false;
                                _this.trigger('dateUnrender');
                        });
                }
                else {
                        return Promise.resolve();
                }
        },


        // Date Rendering Triggers
        // -----------------------------------------------------------------------------------------------------------------


        onDateRender: function() {
                this.triggerRender();
        },


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


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


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


        // Misc view rendering utils
        // -------------------------


        // Signals that the view's content has been rendered
        triggerRender: function() {
                this.publiclyTrigger('viewRender', this, this, this.el);
        },


        // Signals that the view's content is about to be unrendered
        triggerUnrender: function() {
                this.publiclyTrigger('viewDestroy', this, this, this.el);
        },


        // 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());
        },


        // Initializes internal variables related to theming
        initThemingProps: function() {
                var tm = this.opt('theme') ? 'ui' : 'fc';

                this.widgetHeaderClass = tm + '-widget-header';
                this.widgetContentClass = tm + '-widget-content';
                this.highlightStateClass = tm + '-state-highlight';
        },


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


        // Renders business-hours onto the view. Assumes updateSize has already been called.
        renderBusinessHours: function() {
                // subclasses should implement
        },


        // Unrenders previously-rendered business-hours
        unrenderBusinessHours: function() {
                // subclasses should implement
        },


        /* 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;
                }
        },


        // 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) {
                // subclasses should implement
        },


        // Undoes the rendering actions from renderNowIndicator
        unrenderNowIndicator: function() {
                // subclasses should implement
        },


        /* Dimensions
        ------------------------------------------------------------------------------------------------------------------*/


        // Refreshes anything dependant upon sizing of the container element of the grid
        updateSize: function(isResize) {

                if (isResize) {
                        this.captureScroll();
                }

                this.updateHeight(isResize);
                this.updateWidth(isResize);
                this.updateNowIndicator();

                if (isResize) {
                        this.releaseScroll();
                }
        },


        // 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
        ------------------------------------------------------------------------------------------------------------------*/


        capturedScroll: null,
        capturedScrollDepth: 0,


        captureScroll: function() {
                if (!(this.capturedScrollDepth++)) {
                        this.capturedScroll = this.isDateRendered ? this.queryScroll() : {}; // require a render first
                        return true; // root?
                }
                return false;
        },


        captureInitialScroll: function(forcedScroll) {
                if (this.captureScroll()) { // root?
                        this.capturedScroll.isInitial = true;

                        if (forcedScroll) {
                                $.extend(this.capturedScroll, forcedScroll);
                        }
                        else {
                                this.capturedScroll.isComputed = true;
                        }
                }
        },


        releaseScroll: function() {
                var scroll = this.capturedScroll;
                var isRoot = this.discardScroll();

                if (scroll.isComputed) {
                        if (isRoot) {
                                // only compute initial scroll if it will actually be used (is the root capture)
                                $.extend(scroll, this.computeInitialScroll());
                        }
                        else {
                                scroll = null; // scroll couldn't be computed. don't apply it to the DOM
                        }
                }

                if (scroll) {
                        // we act immediately on a releaseScroll operation, as opposed to captureScroll.
                        // if capture/release wraps a render operation that screws up the scroll,
                        // we still want to restore it a good state after, regardless of depth.

                        if (scroll.isInitial) {
                                this.hardSetScroll(scroll); // outsmart how browsers set scroll on initial DOM
                        }
                        else {
                                this.setScroll(scroll);
                        }
                }
        },


        discardScroll: function() {
                if (!(--this.capturedScrollDepth)) {
                        this.capturedScroll = null;
                        return true; // root?
                }
                return false;
        },


        computeInitialScroll: function() {
                return {};
        },


        queryScroll: function() {
                return {};
        },


        hardSetScroll: function(scroll) {
                var _this = this;
                var exec = function() { _this.setScroll(scroll); };
                exec();
                setTimeout(exec, 0); // to surely clear the browser's initial scroll for the DOM
        },


        setScroll: function(scroll) {
        },


        /* Height Freezing
        ------------------------------------------------------------------------------------------------------------------*/


        freezeHeight: function() {
                this.calendar.freezeContentHeight();
        },


        thawHeight: function() {
                this.calendar.thawContentHeight();
        },


        // Event Binding/Unbinding
        // -----------------------------------------------------------------------------------------------------------------


        bindEvents: function() {
                var _this = this;

                if (!this.isEventsBound) {
                        this.isEventsBound = true;
                        this.rejectOn('eventsUnbind', this.requestEvents()).then(function(events) { // TODO: test rejection
                                _this.listenTo(_this.calendar, 'eventsReset', _this.setEvents);
                                _this.setEvents(events);
                        });
                }
        },


        unbindEvents: function() {
                if (this.isEventsBound) {
                        this.isEventsBound = false;
                        this.stopListeningTo(this.calendar, 'eventsReset');
                        this.unsetEvents();
                        this.trigger('eventsUnbind');
                }
        },


        // Event Setting/Unsetting
        // -----------------------------------------------------------------------------------------------------------------


        setEvents: function(events) {
                var isReset = this.isEventSet;

                this.isEventsSet = true;
                this.handleEvents(events, isReset);
                this.trigger(isReset ? 'eventsReset' : 'eventsSet', events);
        },


        unsetEvents: function() {
                if (this.isEventsSet) {
                        this.isEventsSet = false;
                        this.handleEventsUnset();
                        this.trigger('eventsUnset');
                }
        },


        whenEventsSet: function() {
                var _this = this;

                if (this.isEventsSet) {
                        return Promise.resolve(this.getCurrentEvents());
                }
                else {
                        return new Promise(function(resolve) {
                                _this.one('eventsSet', resolve);
                        });
                }
        },


        // Event Handling
        // -----------------------------------------------------------------------------------------------------------------


        handleEvents: function(events, isReset) {
                this.requestEventsRender(events);
        },


        handleEventsUnset: function() {
                this.requestEventsUnrender();
        },


        // Event Render Queuing
        // -----------------------------------------------------------------------------------------------------------------


        // assumes any previous event renders have been cleared already
        requestEventsRender: function(events) {
                var _this = this;

                return this.eventRenderQueue.add(function() { // might not return a promise if debounced!? bad
                        return _this.executeEventsRender(events);
                });
        },


        requestEventsUnrender: function() {
                var _this = this;

                if (this.isEventsRendered) {
                        return this.eventRenderQueue.addQuickly(function() {
                                return _this.executeEventsUnrender();
                        });
                }
                else {
                        return Promise.resolve();
                }
        },


        requestCurrentEventsRender: function() {
                if (this.isEventsSet) {
                        this.requestEventsRender(this.getCurrentEvents());
                }
                else {
                        return Promise.reject();
                }
        },


        // Event High-level Rendering
        // -----------------------------------------------------------------------------------------------------------------


        executeEventsRender: function(events) {
                var _this = this;

                this.captureScroll();
                this.freezeHeight();

                return this.executeEventsUnrender().then(function() {
                        _this.renderEvents(events);

                        _this.thawHeight();
                        _this.releaseScroll();

                        _this.isEventsRendered = true;
                        _this.onEventsRender();
                        _this.trigger('eventsRender');
                });
        },


        executeEventsUnrender: function() {
                if (this.isEventsRendered) {
                        this.onBeforeEventsUnrender();

                        this.captureScroll();
                        this.freezeHeight();

                        if (this.destroyEvents) {
                                this.destroyEvents(); // TODO: deprecate
                        }

                        this.unrenderEvents();

                        this.thawHeight();
                        this.releaseScroll();

                        this.isEventsRendered = false;
                        this.trigger('eventsUnrender');
                }

                return Promise.resolve(); // always synchronous
        },


        // Event Rendering Triggers
        // -----------------------------------------------------------------------------------------------------------------


        // Signals that all events have been rendered
        onEventsRender: function() {
                this.renderedEventSegEach(function(seg) {
                        this.publiclyTrigger('eventAfterRender', seg.event, seg.event, seg.el);
                });
                this.publiclyTrigger('eventAfterAllRender');
        },


        // Signals that all event elements are about to be removed
        onBeforeEventsUnrender: function() {
                this.renderedEventSegEach(function(seg) {
                        this.publiclyTrigger('eventDestroy', seg.event, seg.event, seg.el);
                });
        },


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


        // Renders the events onto the view.
        renderEvents: function(events) {
                // subclasses should implement
        },


        // Removes event elements from the view.
        unrenderEvents: function() {
                // subclasses should implement
        },


        // Event Data Access
        // -----------------------------------------------------------------------------------------------------------------


        requestEvents: function() {
                return this.calendar.requestEvents(this.start, this.end);
        },


        getCurrentEvents: function() {
                return this.calendar.getPrunedEventCache();
        },


        // Event Rendering Utils
        // -----------------------------------------------------------------------------------------------------------------


        // 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.
        resolveEventEl: function(event, el) {
                var custom = this.publiclyTrigger('eventRender', event, event, el);

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

                return el;
        },


        // Hides all rendered event segments linked to the given event
        showEvent: function(event) {
                this.renderedEventSegEach(function(seg) {
                        seg.el.css('visibility', '');
                }, event);
        },


        // Shows all rendered event segments linked to the given event
        hideEvent: function(event) {
                this.renderedEventSegEach(function(seg) {
                        seg.el.css('visibility', 'hidden');
                }, event);
        },


        // Iterates through event segments that have been rendered (have an el). Goes through all by default.
        // If the optional `event` argument is specified, only iterates through segments linked to that event.
        // The `this` value of the callback function will be the view.
        renderedEventSegEach: function(func, event) {
                var segs = this.getEventSegs();
                var i;

                for (i = 0; i < segs.length; i++) {
                        if (!event || segs[i].event._id === event._id) {
                                if (segs[i].el) {
                                        func.call(this, segs[i]);
                                }
                        }
                }
        },


        // Retrieves all the rendered segment objects for the view
        getEventSegs: function() {
                // subclasses must implement
                return [];
        },


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


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


        isEventStartEditable: function(event) {
                return firstDefined(
                        event.startEditable,
                        (event.source || {}).startEditable,
                        this.opt('eventStartEditable'),
                        this.isEventGenerallyEditable(event)
                );
        },


        isEventGenerallyEditable: function(event) {
                return firstDefined(
                        event.editable,
                        (event.source || {}).editable,
                        this.opt('editable')
                );
        },


        // Must be called when an event in the view is dropped onto new location.
        // `dropLocation` is an object that contains the new zoned start/end/allDay values for the event.
        reportSegDrop: function(seg, dropLocation, largeUnit, el, ev) {
                var calendar = this.calendar;
                var mutateResult = calendar.mutateSeg(seg, dropLocation, largeUnit);
                var undoFunc = function() {
                        mutateResult.undo();
                        calendar.reportEventChange();
                };

                this.triggerEventDrop(seg.event, mutateResult.dateDelta, undoFunc, el, ev);
                calendar.reportEventChange(); // will rerender events
        },


        // Triggers event-drop handlers that have subscribed via the API
        triggerEventDrop: function(event, dateDelta, undoFunc, el, ev) {
                this.publiclyTrigger('eventDrop', el[0], event, dateDelta, undoFunc, ev, {}); // {} = jqui dummy
        },


        /* 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(meta, dropLocation, el, ev, ui) {
                var eventProps = meta.eventProps;
                var eventInput;
                var event;

                // Try to build an event object and render it. TODO: decouple the two
                if (eventProps) {
                        eventInput = $.extend({}, eventProps, dropLocation);
                        event = this.calendar.renderEvent(eventInput, meta.stick)[0]; // renderEvent returns an array
                }

                this.triggerExternalDrop(event, dropLocation, el, ev, ui);
        },


        // Triggers external-drop handlers that have subscribed via the API
        triggerExternalDrop: function(event, dropLocation, el, ev, ui) {

                // trigger 'drop' regardless of whether element represents an event
                this.publiclyTrigger('drop', el[0], dropLocation.start, ev, ui);

                if (event) {
                        this.publiclyTrigger('eventReceive', null, event); // signal an external event landed
                }
        },


        /* 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(dropLocation, seg) {
                // subclasses must implement
        },


        // Unrenders a visual indication of an event or external-element being dragged.
        unrenderDrag: function() {
                // subclasses must implement
        },


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


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


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


        // Computes if the given event is allowed to be resized by the user at all
        isEventResizable: function(event) {
                var source = event.source || {};

                return firstDefined(
                        event.durationEditable,
                        source.durationEditable,
                        this.opt('eventDurationEditable'),
                        event.editable,
                        source.editable,
                        this.opt('editable')
                );
        },


        // Must be called when an event in the view has been resized to a new length
        reportSegResize: function(seg, resizeLocation, largeUnit, el, ev) {
                var calendar = this.calendar;
                var mutateResult = calendar.mutateSeg(seg, resizeLocation, largeUnit);
                var undoFunc = function() {
                        mutateResult.undo();
                        calendar.reportEventChange();
                };

                this.triggerEventResize(seg.event, mutateResult.durationDelta, undoFunc, el, ev);
                calendar.reportEventChange(); // will rerender events
        },


        // Triggers event-resize handlers that have subscribed via the API
        triggerEventResize: function(event, durationDelta, undoFunc, el, ev) {
                this.publiclyTrigger('eventResize', el[0], event, durationDelta, undoFunc, ev, {}); // {} = jqui dummy
        },


        /* 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(span, ev) {
                this.unselect(ev);
                this.renderSelection(span);
                this.reportSelection(span, ev);
        },


        // Renders a visual indication of the selection
        renderSelection: function(span) {
                // subclasses should implement
        },


        // Called when a new selection is made. Updates internal state and triggers handlers.
        reportSelection: function(span, ev) {
                this.isSelected = true;
                this.triggerSelect(span, ev);
        },


        // Triggers handlers to 'select'
        triggerSelect: function(span, ev) {
                this.publiclyTrigger(
                        'select',
                        null,
                        this.calendar.applyTimezone(span.start), // convert to calendar's tz for external API
                        this.calendar.applyTimezone(span.end), // "
                        ev
                );
        },


        // 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', null, ev);
                }
        },


        // Unrenders a visual indication of selection
        unrenderSelection: function() {
                // subclasses should implement
        },


        /* Event Selection
        ------------------------------------------------------------------------------------------------------------------*/


        selectEvent: function(event) {
                if (!this.selectedEvent || this.selectedEvent !== event) {
                        this.unselectEvent();
                        this.renderedEventSegEach(function(seg) {
                                seg.el.addClass('fc-selected');
                        }, event);
                        this.selectedEvent = event;
                }
        },


        unselectEvent: function() {
                if (this.selectedEvent) {
                        this.renderedEventSegEach(function(seg) {
                                seg.el.removeClass('fc-selected');
                        }, this.selectedEvent);
                        this.selectedEvent = null;
                }
        },


        isEventSelected: function(event) {
                // event references might change on refetchEvents(), while selectedEvent doesn't,
                // so compare IDs
                return this.selectedEvent && this.selectedEvent._id === event._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.selectedEvent) {
                        if (!$(ev.target).closest('.fc-selected').length) {
                                this.unselectEvent();
                        }
                }
        },


        /* Day Click
        ------------------------------------------------------------------------------------------------------------------*/


        // Triggers handlers to 'dayClick'
        // Span has start/end of the clicked area. Only the start is useful.
        triggerDayClick: function(span, dayEl, ev) {
                this.publiclyTrigger(
                        'dayClick',
                        dayEl,
                        this.calendar.applyTimezone(span.start), // convert to calendar's timezone for external API
                        ev
                );
        },


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


        // 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.
        // 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;
        },


        // Returns the date range of the full days the given range visually appears to occupy.
        // Returns a new range object.
        computeDayRange: function(range) {
                var startDay = range.start.clone().stripTime(); // the beginning of the day the range starts
                var end = range.end;
                var endDay = null;
                var endTimeMS;

                if (end) {
                        endDay = end.clone().stripTime(); // the beginning of the day the range exclusively ends
                        endTimeMS = +end.time(); // # of milliseconds into `endDay`

                        // 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 no end was specified, or if it is within `startDay` but not past nextDayThreshold,
                // assign the default duration of one day.
                if (!end || endDay <= startDay) {
                        endDay = startDay.clone().add(1, 'days');
                }

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


        // Does the given event visually appear to occupy more than one day?
        isMultiDayEvent: function(event) {
                var range = this.computeDayRange(event); // event is range-ish

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

});

;;

/*
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 = [];
        var tm;

        // 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;

                tm = calendar.options.theme ? 'ui' : 'fc';

                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 sectionEl = $('<div class="fc-' + position + '"/>');
                var buttonStr = toolbarOptions.layout[position];

                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 overrideText; // text explicitly set by calendar's constructor options. overcomes icons
                                        var defaultText;
                                        var themeIcon;
                                        var normalIcon;
                                        var innerHtml;
                                        var classes;
                                        var button; // the element

                                        if (buttonName == 'title') {
                                                groupChildren = groupChildren.add($('<h2>&nbsp;</h2>')); // we always want it to take up height
                                                isOnlyButtons = false;
                                        }
                                        else {
                                                if ((customButtonProps = (calendar.options.customButtons || {})[buttonName])) {
                                                        buttonClick = function(ev) {
                                                                if (customButtonProps.click) {
                                                                        customButtonProps.click.call(button[0], ev);
                                                                }
                                                        };
                                                        overrideText = ''; // icons will override text
                                                        defaultText = customButtonProps.text;
                                                }
                                                else if ((viewSpec = calendar.getViewSpec(buttonName))) {
                                                        buttonClick = function() {
                                                                calendar.changeView(buttonName);
                                                        };
                                                        viewsWithButtons.push(buttonName);
                                                        overrideText = viewSpec.buttonTextOverride;
                                                        defaultText = viewSpec.buttonTextDefault;
                                                }
                                                else if (calendar[buttonName]) { // a calendar method
                                                        buttonClick = function() {
                                                                calendar[buttonName]();
                                                        };
                                                        overrideText = (calendar.overrides.buttonText || {})[buttonName];
                                                        defaultText = calendar.options.buttonText[buttonName]; // everything else is considered default
                                                }

                                                if (buttonClick) {

                                                        themeIcon =
                                                                customButtonProps ?
                                                                        customButtonProps.themeIcon :
                                                                        calendar.options.themeButtonIcons[buttonName];

                                                        normalIcon =
                                                                customButtonProps ?
                                                                        customButtonProps.icon :
                                                                        calendar.options.buttonIcons[buttonName];

                                                        if (overrideText) {
                                                                innerHtml = htmlEscape(overrideText);
                                                        }
                                                        else if (themeIcon && calendar.options.theme) {
                                                                innerHtml = "<span class='ui-icon ui-icon-" + themeIcon + "'></span>";
                                                        }
                                                        else if (normalIcon && !calendar.options.theme) {
                                                                innerHtml = "<span class='fc-icon fc-icon-" + normalIcon + "'></span>";
                                                        }
                                                        else {
                                                                innerHtml = htmlEscape(defaultText);
                                                        }

                                                        classes = [
                                                                'fc-' + buttonName + '-button',
                                                                tm + '-button',
                                                                tm + '-state-default'
                                                        ];

                                                        button = $( // type="button" so that it doesn't submit a form
                                                                '<button type="button" class="' + classes.join(' ') + '">' +
                                                                        innerHtml +
                                                                '</button>'
                                                                )
                                                                .click(function(ev) {
                                                                        // don't process clicks for disabled buttons
                                                                        if (!button.hasClass(tm + '-state-disabled')) {

                                                                                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 (
                                                                                        button.hasClass(tm + '-state-active') ||
                                                                                        button.hasClass(tm + '-state-disabled')
                                                                                ) {
                                                                                        button.removeClass(tm + '-state-hover');
                                                                                }
                                                                        }
                                                                })
                                                                .mousedown(function() {
                                                                        // the *down* effect (mouse pressed in).
                                                                        // only on buttons that are not the "active" tab, or disabled
                                                                        button
                                                                                .not('.' + tm + '-state-active')
                                                                                .not('.' + tm + '-state-disabled')
                                                                                .addClass(tm + '-state-down');
                                                                })
                                                                .mouseup(function() {
                                                                        // undo the *down* effect
                                                                        button.removeClass(tm + '-state-down');
                                                                })
                                                                .hover(
                                                                        function() {
                                                                                // the *hover* effect.
                                                                                // only on buttons that are not the "active" tab, or disabled
                                                                                button
                                                                                        .not('.' + tm + '-state-active')
                                                                                        .not('.' + tm + '-state-disabled')
                                                                                        .addClass(tm + '-state-hover');
                                                                        },
                                                                        function() {
                                                                                // undo the *hover* effect
                                                                                button
                                                                                        .removeClass(tm + '-state-hover')
                                                                                        .removeClass(tm + '-state-down'); // if mouseleave happens before mouseup
                                                                        }
                                                                );

                                                        groupChildren = groupChildren.add(button);
                                                }
                                        }
                                });

                                if (isOnlyButtons) {
                                        groupChildren
                                                .first().addClass(tm + '-corner-left').end()
                                                .last().addClass(tm + '-corner-right').end();
                                }

                                if (groupChildren.length > 1) {
                                        groupEl = $('<div/>');
                                        if (isOnlyButtons) {
                                                groupEl.addClass('fc-button-group');
                                        }
                                        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(tm + '-state-active');
                }
        }


        function deactivateButton(buttonName) {
                if (el) {
                        el.find('.fc-' + buttonName + '-button')
                                .removeClass(tm + '-state-active');
                }
        }


        function disableButton(buttonName) {
                if (el) {
                        el.find('.fc-' + buttonName + '-button')
                                .prop('disabled', true)
                                .addClass(tm + '-state-disabled');
                }
        }


        function enableButton(buttonName) {
                if (el) {
                        el.find('.fc-' + buttonName + '-button')
                                .prop('disabled', false)
                                .removeClass(tm + '-state-disabled');
                }
        }


        function getViewsWithButtons() {
                return viewsWithButtons;
        }

}

;;

var Calendar = FC.Calendar = Class.extend({

        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.
        options: null, // all defaults combined with overrides
        viewSpecCache: null, // cache of view definitions
        view: null, // current View object
        header: null,
        footer: null,
        loadingLevel: 0, // number of simultaneous loading tasks


        // a lot of this class' OOP logic is scoped within this constructor function,
        // but in the future, write individual methods on the prototype.
        constructor: Calendar_constructor,


        // Subclasses can override this for initialization logic after the constructor has been called
        initialize: function() {
        },


        // 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;

                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;
                this.options = mergeOptions([ // merge defaults and overrides. lowest to highest precedence
                        Calendar.defaults, // global defaults
                        dirDefaults,
                        localeDefaults,
                        this.overrides,
                        this.dynamicOverrides
                ]);
                populateInstanceComputableOptions(this.options); // fill in gaps with computed options
        },


        // 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, intervalUnits) != -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 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 || {});
                                duration = duration || spec.duration;
                                viewType = viewType || spec.type;
                        }

                        if (overrides) {
                                overridesChain.unshift(overrides); // view-specific option hashes have options at zero-level
                                duration = duration || overrides.duration;
                                viewType = viewType || overrides.type;
                        }
                }

                spec = mergeProps(specChain);
                spec.type = requestedViewType;
                if (!spec['class']) {
                        return false;
                }

                if (duration) {
                        duration = moment.duration(duration);
                        if (duration.valueOf()) { // valid?
                                spec.duration = duration;
                                unit = computeIntervalUnit(duration);

                                // 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
        },


        // 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, viewType, spec.options, spec.duration);
        },


        // Returns a boolean about whether the view is okay to instantiate at some point
        isValidViewType: function(viewType) {
                return Boolean(this.getViewSpec(viewType));
        },


        // Should be called when any type of async data fetching begins
        pushLoading: function() {
                if (!(this.loadingLevel++)) {
                        this.publiclyTrigger('loading', null, true, this.view);
                }
        },


        // Should be called when any type of async data fetching completes
        popLoading: function() {
                if (!(--this.loadingLevel)) {
                        this.publiclyTrigger('loading', null, false, this.view);
                }
        },


        // Given arguments to the select method in the API, returns a span (unzoned start/end and other info)
        buildSelectSpan: 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 { start: start, end: end };
        }

});


Calendar.mixin(EmitterMixin);


function Calendar_constructor(element, overrides) {
        var t = this;

        // declare the current calendar instance relies on GlobalEmitter. needed for garbage collection.
        GlobalEmitter.needed();


        // Exports
        // -----------------------------------------------------------------------------------

        t.render = render;
        t.destroy = destroy;
        t.rerenderEvents = rerenderEvents;
        t.changeView = renderView; // `renderView` will switch to another view
        t.select = select;
        t.unselect = unselect;
        t.prev = prev;
        t.next = next;
        t.prevYear = prevYear;
        t.nextYear = nextYear;
        t.today = today;
        t.gotoDate = gotoDate;
        t.incrementDate = incrementDate;
        t.zoomTo = zoomTo;
        t.getDate = getDate;
        t.getCalendar = getCalendar;
        t.getView = getView;
        t.option = option; // getter/setter method
        t.publiclyTrigger = publiclyTrigger;


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

        t.dynamicOverrides = {};
        t.viewSpecCache = {};
        t.optionHandlers = {}; // for Calendar.options.js
        t.overrides = $.extend({}, overrides); // make a copy

        t.populateOptionsHash(); // sets this.options



        // Locale-data Internals
        // -----------------------------------------------------------------------------------
        // Apply overrides to the current locale's data

        var localeData;

        // Called immediately, and when any of the options change.
        // Happens before any internal objects rebuild or rerender, because this is very core.
        t.bindOptions([
                'locale', 'monthNames', 'monthNamesShort', 'dayNames', 'dayNamesShort', 'firstDay', 'weekNumberCalculation'
        ], function(locale, monthNames, monthNamesShort, dayNames, dayNamesShort, firstDay, weekNumberCalculation) {

                // normalize
                if (weekNumberCalculation === 'iso') {
                        weekNumberCalculation = 'ISO'; // normalize
                }

                localeData = createObject( // make a cheap copy
                        getMomentLocaleData(locale) // will fall back to en
                );

                if (monthNames) {
                        localeData._months = monthNames;
                }
                if (monthNamesShort) {
                        localeData._monthsShort = monthNamesShort;
                }
                if (dayNames) {
                        localeData._weekdays = dayNames;
                }
                if (dayNamesShort) {
                        localeData._weekdaysShort = dayNamesShort;
                }

                if (firstDay == null && weekNumberCalculation === 'ISO') {
                        firstDay = 1;
                }
                if (firstDay != null) {
                        var _week = createObject(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
                }

                // 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 (date) {
                        localizeMoment(date); // sets to localeData
                }
        });


        // Calendar-specific Date Utilities
        // -----------------------------------------------------------------------------------


        t.defaultAllDayEventDuration = moment.duration(t.options.defaultAllDayEventDuration);
        t.defaultTimedEventDuration = moment.duration(t.options.defaultTimedEventDuration);


        // Builds a moment using the settings of the current calendar: timezone and locale.
        // Accepts anything the vanilla moment() constructor accepts.
        t.moment = function() {
                var mom;

                if (t.options.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 (t.options.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
                }

                localizeMoment(mom);

                return mom;
        };


        // Updates the given moment's locale settings to the current calendar locale settings.
        function localizeMoment(mom) {
                mom._locale = localeData;
        }
        t.localizeMoment = localizeMoment;


        // Returns a boolean about whether or not the calendar knows how to calculate
        // the timezone offset of arbitrary dates in the current timezone.
        t.getIsAmbigTimezone = function() {
                return t.options.timezone !== 'local' && t.options.timezone !== 'UTC';
        };


        // Returns a copy of the given date in the current timezone. Has no effect on dates without times.
        t.applyTimezone = function(date) {
                if (!date.hasTime()) {
                        return date.clone();
                }

                var zonedDate = t.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;
        };


        // 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.
        t.getNow = function() {
                var now = t.options.now;
                if (typeof now === 'function') {
                        now = now();
                }
                return t.moment(now).stripZone();
        };


        // Get an event's normalized end date. If not present, calculate it from the defaults.
        t.getEventEnd = function(event) {
                if (event.end) {
                        return event.end.clone();
                }
                else {
                        return t.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
        t.getDefaultEventEnd = function(allDay, zonedStart) {
                var end = zonedStart.clone();

                if (allDay) {
                        end.stripTime().add(t.defaultAllDayEventDuration);
                }
                else {
                        end.add(t.defaultTimedEventDuration);
                }

                if (t.getIsAmbigTimezone()) {
                        end.stripZone(); // we don't know what the tzo should be
                }

                return end;
        };


        // Produces a human-readable string for the given duration.
        // Side-effect: changes the locale of the given duration.
        t.humanizeDuration = function(duration) {
                return duration.locale(t.options.locale).humanize();
        };



        // Imports
        // -----------------------------------------------------------------------------------


        EventManager.call(t);



        // Locals
        // -----------------------------------------------------------------------------------


        var _element = element[0];
        var toolbarsManager;
        var header;
        var footer;
        var content;
        var tm; // for making theme classes
        var currentView; // NOTE: keep this in sync with this.view
        var viewsByType = {}; // holds all instantiated view instances, current or not
        var suggestedViewHeight;
        var windowResizeProxy; // wraps the windowResize function
        var ignoreWindowResize = 0;
        var date; // unzoned



        // Main Rendering
        // -----------------------------------------------------------------------------------


        // compute the initial ambig-timezone date
        if (t.options.defaultDate != null) {
                date = t.moment(t.options.defaultDate).stripZone();
        }
        else {
                date = t.getNow(); // getNow already returns unzoned
        }


        function render() {
                if (!content) {
                        initialRender();
                }
                else if (elementVisible()) {
                        // mainly for the public API
                        calcSize();
                        renderView();
                }
        }


        function initialRender() {
                element.addClass('fc');

                // event delegation for nav links
                element.on('click.fc', 'a[data-goto]', function(ev) {
                        var anchorEl = $(this);
                        var gotoOptions = anchorEl.data('goto'); // will automatically parse JSON
                        var date = t.moment(gotoOptions.date);
                        var viewType = gotoOptions.type;

                        // property like "navLinkDayClick". might be a string or a function
                        var customAction = currentView.opt('navLink' + capitaliseFirstLetter(viewType) + 'Click');

                        if (typeof customAction === 'function') {
                                customAction(date, ev);
                        }
                        else {
                                if (typeof customAction === 'string') {
                                        viewType = customAction;
                                }
                                zoomTo(date, viewType);
                        }
                });

                // called immediately, and upon option change
                t.bindOption('theme', function(theme) {
                        tm = theme ? 'ui' : 'fc'; // affects a larger scope
                        element.toggleClass('ui-widget', theme);
                        element.toggleClass('fc-unthemed', !theme);
                });

                // called immediately, and upon option change.
                // HACK: locale often affects isRTL, so we explicitly listen to that too.
                t.bindOptions([ 'isRTL', 'locale' ], function(isRTL) {
                        element.toggleClass('fc-ltr', !isRTL);
                        element.toggleClass('fc-rtl', isRTL);
                });

                content = $("<div class='fc-view-container'/>").prependTo(element);

                var toolbars = buildToolbars();
                toolbarsManager = new Iterator(toolbars);

                header = t.header = toolbars[0];
                footer = t.footer = toolbars[1];

                renderHeader();
                renderFooter();
                renderView(t.options.defaultView);

                if (t.options.handleWindowResize) {
                        windowResizeProxy = debounce(windowResize, t.options.windowResizeDelay); // prevents rapid calls
                        $(window).resize(windowResizeProxy);
                }
        }


        function destroy() {

                if (currentView) {
                        currentView.removeElement();

                        // NOTE: don't null-out currentView/t.view in case API methods are called after destroy.
                        // It is still the "current" view, just not rendered.
                }

                toolbarsManager.proxyCall('removeElement');
                content.remove();
                element.removeClass('fc fc-ltr fc-rtl fc-unthemed ui-widget');

                element.off('.fc'); // unbind nav link handlers

                if (windowResizeProxy) {
                        $(window).unbind('resize', windowResizeProxy);
                }

                GlobalEmitter.unneeded();
        }


        function elementVisible() {
                return element.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.
        function renderView(viewType, forcedScroll) {
                ignoreWindowResize++;

                var needsClearView = currentView && viewType && currentView.type !== viewType;

                // if viewType is changing, remove the old view's rendering
                if (needsClearView) {
                        freezeContentHeight(); // prevent a scroll jump when view element is removed
                        clearView();
                }

                // if viewType changed, or the view was never created, create a fresh view
                if (!currentView && viewType) {
                        currentView = t.view =
                                viewsByType[viewType] ||
                                (viewsByType[viewType] = t.instantiateView(viewType));

                        currentView.setElement(
                                $("<div class='fc-view fc-" + viewType + "-view' />").appendTo(content)
                        );
                        toolbarsManager.proxyCall('activateButton', viewType);
                }

                if (currentView) {

                        // in case the view should render a period of time that is completely hidden
                        date = currentView.massageCurrentDate(date);

                        // render or rerender the view
                        if (
                                !currentView.isDateSet ||
                                !( // NOT within interval range signals an implicit date window change
                                        date >= currentView.intervalStart &&
                                        date < currentView.intervalEnd
                                )
                        ) {
                                if (elementVisible()) {

                                        if (forcedScroll) {
                                                currentView.captureInitialScroll(forcedScroll);
                                        }

                                        currentView.setDate(date, forcedScroll);

                                        if (forcedScroll) {
                                                currentView.releaseScroll();
                                        }

                                        // need to do this after View::render, so dates are calculated
                                        // NOTE: view updates title text proactively
                                        updateToolbarsTodayButton();
                                }
                        }
                }

                if (needsClearView) {
                        thawContentHeight();
                }

                ignoreWindowResize--;
        }


        // Unrenders the current view and reflects this change in the Header.
        // Unregsiters the `currentView`, but does not remove from viewByType hash.
        function clearView() {
                toolbarsManager.proxyCall('deactivateButton', currentView.type);
                currentView.removeElement();
                currentView = t.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.
        function reinitView() {
                ignoreWindowResize++;
                freezeContentHeight();

                var viewType = currentView.type;
                var scrollState = currentView.queryScroll();
                clearView();
                calcSize();
                renderView(viewType, scrollState);

                thawContentHeight();
                ignoreWindowResize--;
        }



        // Resizing
        // -----------------------------------------------------------------------------------


        t.getSuggestedViewHeight = function() {
                if (suggestedViewHeight === undefined) {
                        calcSize();
                }
                return suggestedViewHeight;
        };


        t.isHeightAuto = function() {
                return t.options.contentHeight === 'auto' || t.options.height === 'auto';
        };


        function updateSize(shouldRecalc) {
                if (elementVisible()) {

                        if (shouldRecalc) {
                                _calcSize();
                        }

                        ignoreWindowResize++;
                        currentView.updateSize(true); // isResize=true. will poll getSuggestedViewHeight() and isHeightAuto()
                        ignoreWindowResize--;

                        return true; // signal success
                }
        }


        function calcSize() {
                if (elementVisible()) {
                        _calcSize();
                }
        }


        function _calcSize() { // assumes elementVisible
                var contentHeightInput = t.options.contentHeight;
                var heightInput = t.options.height;

                if (typeof contentHeightInput === 'number') { // exists and not 'auto'
                        suggestedViewHeight = contentHeightInput;
                }
                else if (typeof contentHeightInput === 'function') { // exists and is a function
                        suggestedViewHeight = contentHeightInput();
                }
                else if (typeof heightInput === 'number') { // exists and not 'auto'
                        suggestedViewHeight = heightInput - queryToolbarsHeight();
                }
                else if (typeof heightInput === 'function') { // exists and is a function
                        suggestedViewHeight = heightInput() - queryToolbarsHeight();
                }
                else if (heightInput === 'parent') { // set to height of parent element
                        suggestedViewHeight = element.parent().height() - queryToolbarsHeight();
                }
                else {
                        suggestedViewHeight = Math.round(content.width() / Math.max(t.options.aspectRatio, .5));
                }
        }


        function queryToolbarsHeight() {
                return toolbarsManager.items.reduce(function(accumulator, toolbar) {
                        var toolbarHeight = toolbar.el ? toolbar.el.outerHeight(true) : 0; // includes margin
                        return accumulator + toolbarHeight;
                }, 0);
        }


        function windowResize(ev) {
                if (
                        !ignoreWindowResize &&
                        ev.target === window && // so we don't process jqui "resize" events that have bubbled up
                        currentView.start // view has already been rendered
                ) {
                        if (updateSize(true)) {
                                currentView.publiclyTrigger('windowResize', _element);
                        }
                }
        }



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


        function rerenderEvents() { // API method. destroys old events if previously rendered.
                if (elementVisible()) {
                        t.reportEventChange(); // will re-trasmit events to the view, causing a rerender
                }
        }



        /* Toolbars
        -----------------------------------------------------------------------------*/


        function buildToolbars() {
                return [
                        new Toolbar(t, computeHeaderOptions()),
                        new Toolbar(t, computeFooterOptions())
                ];
        }


        function computeHeaderOptions() {
                return {
                        extraClasses: 'fc-header-toolbar',
                        layout: t.options.header
                };
        }


        function computeFooterOptions() {
                return {
                        extraClasses: 'fc-footer-toolbar',
                        layout: t.options.footer
                };
        }


        // can be called repeatedly and Header will rerender
        function renderHeader() {
                header.setToolbarOptions(computeHeaderOptions());
                header.render();
                if (header.el) {
                        element.prepend(header.el);
                }
        }


        // can be called repeatedly and Footer will rerender
        function renderFooter() {
                footer.setToolbarOptions(computeFooterOptions());
                footer.render();
                if (footer.el) {
                        element.append(footer.el);
                }
        }


        t.setToolbarsTitle = function(title) {
                toolbarsManager.proxyCall('updateTitle', title);
        };


        function updateToolbarsTodayButton() {
                var now = t.getNow();
                if (now >= currentView.intervalStart && now < currentView.intervalEnd) {
                        toolbarsManager.proxyCall('disableButton', 'today');
                }
                else {
                        toolbarsManager.proxyCall('enableButton', 'today');
                }
        }



        /* Selection
        -----------------------------------------------------------------------------*/


        // this public method receives start/end dates in any format, with any timezone
        function select(zonedStartInput, zonedEndInput) {
                currentView.select(
                        t.buildSelectSpan.apply(t, arguments)
                );
        }


        function unselect() { // safe to be called before renderView
                if (currentView) {
                        currentView.unselect();
                }
        }



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


        function prev() {
                date = currentView.computePrevDate(date);
                renderView();
        }


        function next() {
                date = currentView.computeNextDate(date);
                renderView();
        }


        function prevYear() {
                date.add(-1, 'years');
                renderView();
        }


        function nextYear() {
                date.add(1, 'years');
                renderView();
        }


        function today() {
                date = t.getNow();
                renderView();
        }


        function gotoDate(zonedDateInput) {
                date = t.moment(zonedDateInput).stripZone();
                renderView();
        }


        function incrementDate(delta) {
                date.add(moment.duration(delta));
                renderView();
        }


        // Forces navigation to a view for the given date.
        // `viewType` can be a specific view name or a generic one like "week" or "day".
        function zoomTo(newDate, viewType) {
                var spec;

                viewType = viewType || 'day'; // day is default zoom
                spec = t.getViewSpec(viewType) || t.getUnitViewSpec(viewType);

                date = newDate.clone();
                renderView(spec ? spec.type : null);
        }


        // for external API
        function getDate() {
                return t.applyTimezone(date); // infuse the calendar's timezone
        }



        /* Height "Freezing"
        -----------------------------------------------------------------------------*/


        t.freezeContentHeight = freezeContentHeight;
        t.thawContentHeight = thawContentHeight;

        var freezeContentHeightDepth = 0;


        function freezeContentHeight() {
                if (!(freezeContentHeightDepth++)) {
                        content.css({
                                width: '100%',
                                height: content.height(),
                                overflow: 'hidden'
                        });
                }
        }


        function thawContentHeight() {
                if (!(--freezeContentHeightDepth)) {
                        content.css({
                                width: '',
                                height: '',
                                overflow: ''
                        });
                }
        }



        /* Misc
        -----------------------------------------------------------------------------*/


        function getCalendar() {
                return t;
        }


        function getView() {
                return currentView;
        }


        function option(name, value) {
                var newOptionHash;

                if (typeof name === 'string') {
                        if (value === undefined) { // getter
                                return t.options[name];
                        }
                        else { // setter for individual option
                                newOptionHash = {};
                                newOptionHash[name] = value;
                                setOptions(newOptionHash);
                        }
                }
                else if (typeof name === 'object') { // compound setter with object input
                        setOptions(name);
                }
        }


        function setOptions(newOptionHash) {
                var optionCnt = 0;
                var optionName;

                for (optionName in newOptionHash) {
                        t.dynamicOverrides[optionName] = newOptionHash[optionName];
                }

                t.viewSpecCache = {}; // the dynamic override invalidates the options in this cache, so just clear it
                t.populateOptionsHash(); // this.options needs to be recomputed after the dynamic override

                // trigger handlers after this.options has been updated
                for (optionName in newOptionHash) {
                        t.triggerOptionHandlers(optionName); // recall bindOption/bindOptions
                        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') {
                                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 (currentView) {
                                        currentView.unrenderBusinessHours();
                                        currentView.renderBusinessHours();
                                }
                                return;
                        }
                        else if (optionName === 'timezone') {
                                t.rezoneArrayEventSources();
                                t.refetchEvents();
                                return;
                        }
                }

                // catch-all. rerender the header and footer and rebuild/rerender the current view
                renderHeader();
                renderFooter();
                viewsByType = {}; // even non-current views will be affected by this option change. do before rerender
                reinitView();
        }


        function publiclyTrigger(name, thisObj) {
                var args = Array.prototype.slice.call(arguments, 2);

                thisObj = thisObj || _element;
                this.triggerWith(name, thisObj, args); // Emitter's method

                if (t.options[name]) {
                        return t.options[name].apply(thisObj, args);
                }
        }

        t.initialize();
}

;;
/*
Options binding/triggering system.
*/
Calendar.mixin({

        // A map of option names to arrays of handler objects. Initialized to {} in Calendar.
        // Format for a handler object:
        // {
        //   func // callback function to be called upon change
        //   names // option names whose values should be given to func
        // }
        optionHandlers: null, 

        // Calls handlerFunc immediately, and when the given option has changed.
        // handlerFunc will be given the option value.
        bindOption: function(optionName, handlerFunc) {
                this.bindOptions([ optionName ], handlerFunc);
        },

        // Calls handlerFunc immediately, and when any of the given options change.
        // handlerFunc will be given each option value as ordered function arguments.
        bindOptions: function(optionNames, handlerFunc) {
                var handlerObj = { func: handlerFunc, names: optionNames };
                var i;

                for (i = 0; i < optionNames.length; i++) {
                        this.registerOptionHandlerObj(optionNames[i], handlerObj);
                }

                this.triggerOptionHandlerObj(handlerObj);
        },

        // Puts the given handler object into the internal hash
        registerOptionHandlerObj: function(optionName, handlerObj) {
                (this.optionHandlers[optionName] || (this.optionHandlers[optionName] = []))
                        .push(handlerObj);
        },

        // Reports that the given option has changed, and calls all appropriate handlers.
        triggerOptionHandlers: function(optionName) {
                var handlerObjs = this.optionHandlers[optionName] || [];
                var i;

                for (i = 0; i < handlerObjs.length; i++) {
                        this.triggerOptionHandlerObj(handlerObjs[i]);
                }
        },

        // Calls the callback for a specific handler object, passing in the appropriate arguments.
        triggerOptionHandlerObj: function(handlerObj) {
                var optionNames = handlerObj.names;
                var optionValues = [];
                var i;

                for (i = 0; i < optionNames.length; i++) {
                        optionValues.push(this.options[optionNames[i]]);
                }

                handlerObj.func.apply(this, optionValues); // maintain the Calendar's `this` context
        }

});

;;

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',
        
        // 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: {
                prev: 'left-single-arrow',
                next: 'right-single-arrow',
                prevYear: 'left-double-arrow',
                nextYear: 'right-double-arrow'
        },

        allDayText: 'all-day',
        
        // jquery-ui theming
        theme: false,
        themeButtonIcons: {
                prev: 'circle-triangle-w',
                next: 'circle-triangle-e',
                prevYear: 'seek-prev',
                nextYear: 'seek-next'
        },

        //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';
        }

};

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);

;;

FC.sourceNormalizers = [];
FC.sourceFetchers = [];

var ajaxDefaults = {
        dataType: 'json',
        cache: false
};

var eventGUID = 1;


function EventManager() { // assumed to be a calendar
        var t = this;


        // exports
        t.requestEvents = requestEvents;
        t.reportEventChange = reportEventChange;
        t.isFetchNeeded = isFetchNeeded;
        t.fetchEvents = fetchEvents;
        t.fetchEventSources = fetchEventSources;
        t.refetchEvents = refetchEvents;
        t.refetchEventSources = refetchEventSources;
        t.getEventSources = getEventSources;
        t.getEventSourceById = getEventSourceById;
        t.addEventSource = addEventSource;
        t.removeEventSource = removeEventSource;
        t.removeEventSources = removeEventSources;
        t.updateEvent = updateEvent;
        t.updateEvents = updateEvents;
        t.renderEvent = renderEvent;
        t.renderEvents = renderEvents;
        t.removeEvents = removeEvents;
        t.clientEvents = clientEvents;
        t.mutateEvent = mutateEvent;
        t.normalizeEventDates = normalizeEventDates;
        t.normalizeEventTimes = normalizeEventTimes;


        // locals
        var stickySource = { events: [] };
        var sources = [ stickySource ];
        var rangeStart, rangeEnd;
        var pendingSourceCnt = 0; // outstanding fetch requests, max one per source
        var cache = []; // holds events that have already been expanded
        var prunedCache; // like cache, but only events that intersect with rangeStart/rangeEnd


        $.each(
                (t.options.events ? [ t.options.events ] : []).concat(t.options.eventSources || []),
                function(i, sourceInput) {
                        var source = buildEventSource(sourceInput);
                        if (source) {
                                sources.push(source);
                        }
                }
        );



        function requestEvents(start, end) {
                if (!t.options.lazyFetching || isFetchNeeded(start, end)) {
                        return fetchEvents(start, end);
                }
                else {
                        return Promise.resolve(prunedCache);
                }
        }


        function reportEventChange() {
                prunedCache = filterEventsWithinRange(cache);
                t.trigger('eventsReset', prunedCache);
        }


        function filterEventsWithinRange(events) {
                var filteredEvents = [];
                var i, event;

                for (i = 0; i < events.length; i++) {
                        event = events[i];

                        if (
                                event.start.clone().stripZone() < rangeEnd &&
                                t.getEventEnd(event).stripZone() > rangeStart
                        ) {
                                filteredEvents.push(event);
                        }
                }

                return filteredEvents;
        }


        t.getEventCache = function() {
                return cache;
        };


        t.getPrunedEventCache = function() {
                return prunedCache;
        };



        /* Fetching
        -----------------------------------------------------------------------------*/


        // start and end are assumed to be unzoned
        function isFetchNeeded(start, end) {
                return !rangeStart || // nothing has been fetched yet?
                        start < rangeStart || end > rangeEnd; // is part of the new range outside of the old range?
        }


        function fetchEvents(start, end) {
                rangeStart = start;
                rangeEnd = end;
                return refetchEvents();
        }


        // poorly named. fetches all sources with current `rangeStart` and `rangeEnd`.
        function refetchEvents() {
                return fetchEventSources(sources, 'reset');
        }


        // poorly named. fetches a subset of event sources.
        function refetchEventSources(matchInputs) {
                return fetchEventSources(getEventSourcesByMatchArray(matchInputs));
        }


        // expects an array of event source objects (the originals, not copies)
        // `specialFetchType` is an optimization parameter that affects purging of the event cache.
        function fetchEventSources(specificSources, specialFetchType) {
                var i, source;

                if (specialFetchType === 'reset') {
                        cache = [];
                }
                else if (specialFetchType !== 'add') {
                        cache = excludeEventsBySources(cache, specificSources);
                }

                for (i = 0; i < specificSources.length; i++) {
                        source = specificSources[i];

                        // already-pending sources have already been accounted for in pendingSourceCnt
                        if (source._status !== 'pending') {
                                pendingSourceCnt++;
                        }

                        source._fetchId = (source._fetchId || 0) + 1;
                        source._status = 'pending';
                }

                for (i = 0; i < specificSources.length; i++) {
                        source = specificSources[i];
                        tryFetchEventSource(source, source._fetchId);
                }

                if (pendingSourceCnt) {
                        return new Promise(function(resolve) {
                                t.one('eventsReceived', resolve); // will send prunedCache
                        });
                }
                else { // executed all synchronously, or no sources at all
                        return Promise.resolve(prunedCache);
                }
        }


        // fetches an event source and processes its result ONLY if it is still the current fetch.
        // caller is responsible for incrementing pendingSourceCnt first.
        function tryFetchEventSource(source, fetchId) {
                _fetchEventSource(source, function(eventInputs) {
                        var isArraySource = $.isArray(source.events);
                        var i, eventInput;
                        var abstractEvent;

                        if (
                                // is this the source's most recent fetch?
                                // if not, rely on an upcoming fetch of this source to decrement pendingSourceCnt
                                fetchId === source._fetchId &&
                                // event source no longer valid?
                                source._status !== 'rejected'
                        ) {
                                source._status = 'resolved';

                                if (eventInputs) {
                                        for (i = 0; i < eventInputs.length; i++) {
                                                eventInput = eventInputs[i];

                                                if (isArraySource) { // array sources have already been convert to Event Objects
                                                        abstractEvent = eventInput;
                                                }
                                                else {
                                                        abstractEvent = buildEventFromInput(eventInput, source);
                                                }

                                                if (abstractEvent) { // not false (an invalid event)
                                                        cache.push.apply( // append
                                                                cache,
                                                                expandEvent(abstractEvent) // add individual expanded events to the cache
                                                        );
                                                }
                                        }
                                }

                                decrementPendingSourceCnt();
                        }
                });
        }


        function rejectEventSource(source) {
                var wasPending = source._status === 'pending';

                source._status = 'rejected';

                if (wasPending) {
                        decrementPendingSourceCnt();
                }
        }


        function decrementPendingSourceCnt() {
                pendingSourceCnt--;
                if (!pendingSourceCnt) {
                        reportEventChange(cache); // updates prunedCache
                        t.trigger('eventsReceived', prunedCache);
                }
        }


        function _fetchEventSource(source, callback) {
                var i;
                var fetchers = FC.sourceFetchers;
                var res;

                for (i=0; i<fetchers.length; i++) {
                        res = fetchers[i].call(
                                t, // this, the Calendar object
                                source,
                                rangeStart.clone(),
                                rangeEnd.clone(),
                                t.options.timezone,
                                callback
                        );

                        if (res === true) {
                                // the fetcher is in charge. made its own async request
                                return;
                        }
                        else if (typeof res == 'object') {
                                // the fetcher returned a new source. process it
                                _fetchEventSource(res, callback);
                                return;
                        }
                }

                var events = source.events;
                if (events) {
                        if ($.isFunction(events)) {
                                t.pushLoading();
                                events.call(
                                        t, // this, the Calendar object
                                        rangeStart.clone(),
                                        rangeEnd.clone(),
                                        t.options.timezone,
                                        function(events) {
                                                callback(events);
                                                t.popLoading();
                                        }
                                );
                        }
                        else if ($.isArray(events)) {
                                callback(events);
                        }
                        else {
                                callback();
                        }
                }else{
                        var url = source.url;
                        if (url) {
                                var success = source.success;
                                var error = source.error;
                                var complete = source.complete;

                                // retrieve any outbound GET/POST $.ajax data from the options
                                var customData;
                                if ($.isFunction(source.data)) {
                                        // supplied as a function that returns a key/value object
                                        customData = source.data();
                                }
                                else {
                                        // supplied as a straight key/value object
                                        customData = source.data;
                                }

                                // use a copy of the custom data so we can modify the parameters
                                // and not affect the passed-in object.
                                var data = $.extend({}, customData || {});

                                var startParam = firstDefined(source.startParam, t.options.startParam);
                                var endParam = firstDefined(source.endParam, t.options.endParam);
                                var timezoneParam = firstDefined(source.timezoneParam, t.options.timezoneParam);

                                if (startParam) {
                                        data[startParam] = rangeStart.format();
                                }
                                if (endParam) {
                                        data[endParam] = rangeEnd.format();
                                }
                                if (t.options.timezone && t.options.timezone != 'local') {
                                        data[timezoneParam] = t.options.timezone;
                                }

                                t.pushLoading();
                                $.ajax($.extend({}, ajaxDefaults, source, {
                                        data: data,
                                        success: function(events) {
                                                events = events || [];
                                                var res = applyAll(success, this, arguments);
                                                if ($.isArray(res)) {
                                                        events = res;
                                                }
                                                callback(events);
                                        },
                                        error: function() {
                                                applyAll(error, this, arguments);
                                                callback();
                                        },
                                        complete: function() {
                                                applyAll(complete, this, arguments);
                                                t.popLoading();
                                        }
                                }));
                        }else{
                                callback();
                        }
                }
        }



        /* Sources
        -----------------------------------------------------------------------------*/


        function addEventSource(sourceInput) {
                var source = buildEventSource(sourceInput);
                if (source) {
                        sources.push(source);
                        fetchEventSources([ source ], 'add'); // will eventually call reportEventChange
                }
        }


        function buildEventSource(sourceInput) { // will return undefined if invalid source
                var normalizers = FC.sourceNormalizers;
                var source;
                var i;

                if ($.isFunction(sourceInput) || $.isArray(sourceInput)) {
                        source = { events: sourceInput };
                }
                else if (typeof sourceInput === 'string') {
                        source = { url: sourceInput };
                }
                else if (typeof sourceInput === 'object') {
                        source = $.extend({}, sourceInput); // shallow copy
                }

                if (source) {

                        // TODO: repeat code, same code for event classNames
                        if (source.className) {
                                if (typeof source.className === 'string') {
                                        source.className = source.className.split(/\s+/);
                                }
                                // otherwise, assumed to be an array
                        }
                        else {
                                source.className = [];
                        }

                        // for array sources, we convert to standard Event Objects up front
                        if ($.isArray(source.events)) {
                                source.origArray = source.events; // for removeEventSource
                                source.events = $.map(source.events, function(eventInput) {
                                        return buildEventFromInput(eventInput, source);
                                });
                        }

                        for (i=0; i<normalizers.length; i++) {
                                normalizers[i].call(t, source);
                        }

                        return source;
                }
        }


        function removeEventSource(matchInput) {
                removeSpecificEventSources(
                        getEventSourcesByMatch(matchInput)
                );
        }


        // if called with no arguments, removes all.
        function removeEventSources(matchInputs) {
                if (matchInputs == null) {
                        removeSpecificEventSources(sources, true); // isAll=true
                }
                else {
                        removeSpecificEventSources(
                                getEventSourcesByMatchArray(matchInputs)
                        );
                }
        }


        function removeSpecificEventSources(targetSources, isAll) {
                var i;

                // cancel pending requests
                for (i = 0; i < targetSources.length; i++) {
                        rejectEventSource(targetSources[i]);
                }

                if (isAll) { // an optimization
                        sources = [];
                        cache = [];
                }
                else {
                        // remove from persisted source list
                        sources = $.grep(sources, function(source) {
                                for (i = 0; i < targetSources.length; i++) {
                                        if (source === targetSources[i]) {
                                                return false; // exclude
                                        }
                                }
                                return true; // include
                        });

                        cache = excludeEventsBySources(cache, targetSources);
                }

                reportEventChange();
        }


        function getEventSources() {
                return sources.slice(1); // returns a shallow copy of sources with stickySource removed
        }


        function getEventSourceById(id) {
                return $.grep(sources, function(source) {
                        return source.id && source.id === id;
                })[0];
        }


        // like getEventSourcesByMatch, but accepts multple match criteria (like multiple IDs)
        function getEventSourcesByMatchArray(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,
                                getEventSourcesByMatch(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.
        function getEventSourcesByMatch(matchInput) {
                var i, source;

                // given an proper event source object
                for (i = 0; i < sources.length; i++) {
                        source = sources[i];
                        if (source === matchInput) {
                                return [ source ];
                        }
                }

                // an ID match
                source = getEventSourceById(matchInput);
                if (source) {
                        return [ source ];
                }

                return $.grep(sources, function(source) {
                        return isSourcesEquivalent(matchInput, source);
                });
        }


        function isSourcesEquivalent(source1, source2) {
                return source1 && source2 && getSourcePrimitive(source1) == getSourcePrimitive(source2);
        }


        function getSourcePrimitive(source) {
                return (
                        (typeof source === 'object') ? // a normalized event source?
                                (source.origArray || source.googleCalendarId || source.url || source.events) : // get the primitive
                                null
                ) ||
                source; // the given argument *is* the primitive
        }


        // util
        // returns a filtered array without events that are part of any of the given sources
        function excludeEventsBySources(specificEvents, specificSources) {
                return $.grep(specificEvents, function(event) {
                        for (var i = 0; i < specificSources.length; i++) {
                                if (event.source === specificSources[i]) {
                                        return false; // exclude
                                }
                        }
                        return true; // keep
                });
        }



        /* Manipulation
        -----------------------------------------------------------------------------*/


        // Only ever called from the externally-facing API
        function updateEvent(event) {
                updateEvents([ event ]);
        }


        // Only ever called from the externally-facing API
        function updateEvents(events) {
                var i, event;

                for (i = 0; i < events.length; i++) {
                        event = events[i];

                        // massage start/end values, even if date string values
                        event.start = t.moment(event.start);
                        if (event.end) {
                                event.end = t.moment(event.end);
                        }
                        else {
                                event.end = null;
                        }

                        mutateEvent(event, getMiscEventProps(event)); // will handle start/end/allDay normalization
                }

                reportEventChange(); // reports event modifications (so we can redraw)
        }


        // Returns a hash of misc event properties that should be copied over to related events.
        function getMiscEventProps(event) {
                var props = {};

                $.each(event, function(name, val) {
                        if (isMiscEventPropName(name)) {
                                if (val !== undefined && isAtomic(val)) { // a defined non-object
                                        props[name] = val;
                                }
                        }
                });

                return props;
        }

        // non-date-related, non-id-related, non-secret
        function isMiscEventPropName(name) {
                return !/^_|^(id|allDay|start|end)$/.test(name);
        }


        // returns the expanded events that were created
        function renderEvent(eventInput, stick) {
                return renderEvents([ eventInput ], stick);
        }


        // returns the expanded events that were created
        function renderEvents(eventInputs, stick) {
                var renderedEvents = [];
                var renderableEvents;
                var abstractEvent;
                var i, j, event;

                for (i = 0; i < eventInputs.length; i++) {
                        abstractEvent = buildEventFromInput(eventInputs[i]);

                        if (abstractEvent) { // not false (a valid input)
                                renderableEvents = expandEvent(abstractEvent);

                                for (j = 0; j < renderableEvents.length; j++) {
                                        event = renderableEvents[j];

                                        if (!event.source) {
                                                if (stick) {
                                                        stickySource.events.push(event);
                                                        event.source = stickySource;
                                                }
                                                cache.push(event);
                                        }
                                }

                                renderedEvents = renderedEvents.concat(renderableEvents);
                        }
                }

                if (renderedEvents.length) { // any new events rendered?
                        reportEventChange();
                }

                return renderedEvents;
        }


        function removeEvents(filter) {
                var eventID;
                var i;

                if (filter == null) { // null or undefined. remove all events
                        filter = function() { return true; }; // will always match
                }
                else if (!$.isFunction(filter)) { // an event ID
                        eventID = filter + '';
                        filter = function(event) {
                                return event._id == eventID;
                        };
                }

                // Purge event(s) from our local cache
                cache = $.grep(cache, filter, true); // inverse=true

                // Remove events from array sources.
                // This works because they have been converted to official Event Objects up front.
                // (and as a result, event._id has been calculated).
                for (i=0; i<sources.length; i++) {
                        if ($.isArray(sources[i].events)) {
                                sources[i].events = $.grep(sources[i].events, filter, true);
                        }
                }

                reportEventChange();
        }


        function clientEvents(filter) {
                if ($.isFunction(filter)) {
                        return $.grep(cache, filter);
                }
                else if (filter != null) { // not null, not undefined. an event ID
                        filter += '';
                        return $.grep(cache, function(e) {
                                return e._id == filter;
                        });
                }
                return cache; // else, return all
        }


        // Makes sure all array event sources have their internal event objects
        // converted over to the Calendar's current timezone.
        t.rezoneArrayEventSources = function() {
                var i;
                var events;
                var j;

                for (i = 0; i < sources.length; i++) {
                        events = sources[i].events;
                        if ($.isArray(events)) {

                                for (j = 0; j < events.length; j++) {
                                        rezoneEventDates(events[j]);
                                }
                        }
                }
        };

        function rezoneEventDates(event) {
                event.start = t.moment(event.start);
                if (event.end) {
                        event.end = t.moment(event.end);
                }
                backupEventDates(event);
        }


        /* Event Normalization
        -----------------------------------------------------------------------------*/


        // Given a raw object with key/value properties, returns an "abstract" Event object.
        // An "abstract" event is an event that, if recurring, will not have been expanded yet.
        // Will return `false` when input is invalid.
        // `source` is optional
        function buildEventFromInput(input, source) {
                var out = {};
                var start, end;
                var allDay;

                if (t.options.eventDataTransform) {
                        input = t.options.eventDataTransform(input);
                }
                if (source && source.eventDataTransform) {
                        input = source.eventDataTransform(input);
                }

                // Copy all properties over to the resulting object.
                // The special-case properties will be copied over afterwards.
                $.extend(out, input);

                if (source) {
                        out.source = source;
                }

                out._id = input._id || (input.id === undefined ? '_fc' + eventGUID++ : input.id + '');

                if (input.className) {
                        if (typeof input.className == 'string') {
                                out.className = input.className.split(/\s+/);
                        }
                        else { // assumed to be an array
                                out.className = input.className;
                        }
                }
                else {
                        out.className = [];
                }

                start = input.start || input.date; // "date" is an alias for "start"
                end = input.end;

                // parse as a time (Duration) if applicable
                if (isTimeString(start)) {
                        start = moment.duration(start);
                }
                if (isTimeString(end)) {
                        end = moment.duration(end);
                }

                if (input.dow || moment.isDuration(start) || moment.isDuration(end)) {

                        // the event is "abstract" (recurring) so don't calculate exact start/end dates just yet
                        out.start = start ? moment.duration(start) : null; // will be a Duration or null
                        out.end = end ? moment.duration(end) : null; // will be a Duration or null
                        out._recurring = true; // our internal marker
                }
                else {

                        if (start) {
                                start = t.moment(start);
                                if (!start.isValid()) {
                                        return false;
                                }
                        }

                        if (end) {
                                end = t.moment(end);
                                if (!end.isValid()) {
                                        end = null; // let defaults take over
                                }
                        }

                        allDay = input.allDay;
                        if (allDay === undefined) { // still undefined? fallback to default
                                allDay = firstDefined(
                                        source ? source.allDayDefault : undefined,
                                        t.options.allDayDefault
                                );
                                // still undefined? normalizeEventDates will calculate it
                        }

                        assignDatesToEvent(start, end, allDay, out);
                }

                t.normalizeEvent(out); // hook for external use. a prototype method

                return out;
        }
        t.buildEventFromInput = buildEventFromInput;


        // Normalizes and assigns the given dates to the given partially-formed event object.
        // NOTE: mutates the given start/end moments. does not make a copy.
        function assignDatesToEvent(start, end, allDay, event) {
                event.start = start;
                event.end = end;
                event.allDay = allDay;
                normalizeEventDates(event);
                backupEventDates(event);
        }


        // Ensures proper values for allDay/start/end. Accepts an Event object, or a plain object with event-ish properties.
        // NOTE: Will modify the given object.
        function normalizeEventDates(eventProps) {

                normalizeEventTimes(eventProps);

                if (eventProps.end && !eventProps.end.isAfter(eventProps.start)) {
                        eventProps.end = null;
                }

                if (!eventProps.end) {
                        if (t.options.forceEventDuration) {
                                eventProps.end = t.getDefaultEventEnd(eventProps.allDay, eventProps.start);
                        }
                        else {
                                eventProps.end = null;
                        }
                }
        }


        // Ensures the allDay property exists and the timeliness of the start/end dates are consistent
        function normalizeEventTimes(eventProps) {
                if (eventProps.allDay == null) {
                        eventProps.allDay = !(eventProps.start.hasTime() || (eventProps.end && eventProps.end.hasTime()));
                }

                if (eventProps.allDay) {
                        eventProps.start.stripTime();
                        if (eventProps.end) {
                                // TODO: consider nextDayThreshold here? If so, will require a lot of testing and adjustment
                                eventProps.end.stripTime();
                        }
                }
                else {
                        if (!eventProps.start.hasTime()) {
                                eventProps.start = t.applyTimezone(eventProps.start.time(0)); // will assign a 00:00 time
                        }
                        if (eventProps.end && !eventProps.end.hasTime()) {
                                eventProps.end = t.applyTimezone(eventProps.end.time(0)); // will assign a 00:00 time
                        }
                }
        }


        // If the given event is a recurring event, break it down into an array of individual instances.
        // If not a recurring event, return an array with the single original event.
        // If given a falsy input (probably because of a failed buildEventFromInput call), returns an empty array.
        // HACK: can override the recurring window by providing custom rangeStart/rangeEnd (for businessHours).
        function expandEvent(abstractEvent, _rangeStart, _rangeEnd) {
                var events = [];
                var dowHash;
                var dow;
                var i;
                var date;
                var startTime, endTime;
                var start, end;
                var event;

                _rangeStart = _rangeStart || rangeStart;
                _rangeEnd = _rangeEnd || rangeEnd;

                if (abstractEvent) {
                        if (abstractEvent._recurring) {

                                // make a boolean hash as to whether the event occurs on each day-of-week
                                if ((dow = abstractEvent.dow)) {
                                        dowHash = {};
                                        for (i = 0; i < dow.length; i++) {
                                                dowHash[dow[i]] = true;
                                        }
                                }

                                // iterate through every day in the current range
                                date = _rangeStart.clone().stripTime(); // holds the date of the current day
                                while (date.isBefore(_rangeEnd)) {

                                        if (!dowHash || dowHash[date.day()]) { // if everyday, or this particular day-of-week

                                                startTime = abstractEvent.start; // the stored start and end properties are times (Durations)
                                                endTime = abstractEvent.end; // "
                                                start = date.clone();
                                                end = null;

                                                if (startTime) {
                                                        start = start.time(startTime);
                                                }
                                                if (endTime) {
                                                        end = date.clone().time(endTime);
                                                }

                                                event = $.extend({}, abstractEvent); // make a copy of the original
                                                assignDatesToEvent(
                                                        start, end,
                                                        !startTime && !endTime, // allDay?
                                                        event
                                                );
                                                events.push(event);
                                        }

                                        date.add(1, 'days');
                                }
                        }
                        else {
                                events.push(abstractEvent); // return the original event. will be a one-item array
                        }
                }

                return events;
        }
        t.expandEvent = expandEvent;



        /* Event Modification Math
        -----------------------------------------------------------------------------------------*/


        // Modifies an event and all related events by applying the given properties.
        // Special date-diffing logic is used for manipulation of dates.
        // If `props` does not contain start/end dates, the updated values are assumed to be the event's current start/end.
        // All date comparisons are done against the event's pristine _start and _end dates.
        // Returns an object with delta information and a function to undo all operations.
        // For making computations in a granularity greater than day/time, specify largeUnit.
        // NOTE: The given `newProps` might be mutated for normalization purposes.
        function mutateEvent(event, newProps, largeUnit) {
                var miscProps = {};
                var oldProps;
                var clearEnd;
                var startDelta;
                var endDelta;
                var durationDelta;
                var undoFunc;

                // diffs the dates in the appropriate way, returning a duration
                function diffDates(date1, date0) { // date1 - date0
                        if (largeUnit) {
                                return diffByUnit(date1, date0, largeUnit);
                        }
                        else if (newProps.allDay) {
                                return diffDay(date1, date0);
                        }
                        else {
                                return diffDayTime(date1, date0);
                        }
                }

                newProps = newProps || {};

                // normalize new date-related properties
                if (!newProps.start) {
                        newProps.start = event.start.clone();
                }
                if (newProps.end === undefined) {
                        newProps.end = event.end ? event.end.clone() : null;
                }
                if (newProps.allDay == null) { // is null or undefined?
                        newProps.allDay = event.allDay;
                }
                normalizeEventDates(newProps);

                // create normalized versions of the original props to compare against
                // need a real end value, for diffing
                oldProps = {
                        start: event._start.clone(),
                        end: event._end ? event._end.clone() : t.getDefaultEventEnd(event._allDay, event._start),
                        allDay: newProps.allDay // normalize the dates in the same regard as the new properties
                };
                normalizeEventDates(oldProps);

                // need to clear the end date if explicitly changed to null
                clearEnd = event._end !== null && newProps.end === null;

                // compute the delta for moving the start date
                startDelta = diffDates(newProps.start, oldProps.start);

                // compute the delta for moving the end date
                if (newProps.end) {
                        endDelta = diffDates(newProps.end, oldProps.end);
                        durationDelta = endDelta.subtract(startDelta);
                }
                else {
                        durationDelta = null;
                }

                // gather all non-date-related properties
                $.each(newProps, function(name, val) {
                        if (isMiscEventPropName(name)) {
                                if (val !== undefined) {
                                        miscProps[name] = val;
                                }
                        }
                });

                // apply the operations to the event and all related events
                undoFunc = mutateEvents(
                        clientEvents(event._id), // get events with this ID
                        clearEnd,
                        newProps.allDay,
                        startDelta,
                        durationDelta,
                        miscProps
                );

                return {
                        dateDelta: startDelta,
                        durationDelta: durationDelta,
                        undo: undoFunc
                };
        }


        // Modifies an array of events in the following ways (operations are in order):
        // - clear the event's `end`
        // - convert the event to allDay
        // - add `dateDelta` to the start and end
        // - add `durationDelta` to the event's duration
        // - assign `miscProps` to the event
        //
        // Returns a function that can be called to undo all the operations.
        //
        // TODO: don't use so many closures. possible memory issues when lots of events with same ID.
        //
        function mutateEvents(events, clearEnd, allDay, dateDelta, durationDelta, miscProps) {
                var isAmbigTimezone = t.getIsAmbigTimezone();
                var undoFunctions = [];

                // normalize zero-length deltas to be null
                if (dateDelta && !dateDelta.valueOf()) { dateDelta = null; }
                if (durationDelta && !durationDelta.valueOf()) { durationDelta = null; }

                $.each(events, function(i, event) {
                        var oldProps;
                        var newProps;

                        // build an object holding all the old values, both date-related and misc.
                        // for the undo function.
                        oldProps = {
                                start: event.start.clone(),
                                end: event.end ? event.end.clone() : null,
                                allDay: event.allDay
                        };
                        $.each(miscProps, function(name) {
                                oldProps[name] = event[name];
                        });

                        // new date-related properties. work off the original date snapshot.
                        // ok to use references because they will be thrown away when backupEventDates is called.
                        newProps = {
                                start: event._start,
                                end: event._end,
                                allDay: allDay // normalize the dates in the same regard as the new properties
                        };
                        normalizeEventDates(newProps); // massages start/end/allDay

                        // strip or ensure the end date
                        if (clearEnd) {
                                newProps.end = null;
                        }
                        else if (durationDelta && !newProps.end) { // the duration translation requires an end date
                                newProps.end = t.getDefaultEventEnd(newProps.allDay, newProps.start);
                        }

                        if (dateDelta) {
                                newProps.start.add(dateDelta);
                                if (newProps.end) {
                                        newProps.end.add(dateDelta);
                                }
                        }

                        if (durationDelta) {
                                newProps.end.add(durationDelta); // end already ensured above
                        }

                        // if the dates have changed, and we know it is impossible to recompute the
                        // timezone offsets, strip the zone.
                        if (
                                isAmbigTimezone &&
                                !newProps.allDay &&
                                (dateDelta || durationDelta)
                        ) {
                                newProps.start.stripZone();
                                if (newProps.end) {
                                        newProps.end.stripZone();
                                }
                        }

                        $.extend(event, miscProps, newProps); // copy over misc props, then date-related props
                        backupEventDates(event); // regenerate internal _start/_end/_allDay

                        undoFunctions.push(function() {
                                $.extend(event, oldProps);
                                backupEventDates(event); // regenerate internal _start/_end/_allDay
                        });
                });

                return function() {
                        for (var i = 0; i < undoFunctions.length; i++) {
                                undoFunctions[i]();
                        }
                };
        }

}


// returns an undo function
Calendar.prototype.mutateSeg = function(seg, newProps) {
        return this.mutateEvent(seg.event, newProps);
};


// hook for external libs to manipulate event properties upon creation.
// should manipulate the event in-place.
Calendar.prototype.normalizeEvent = function(event) {
};


// Does the given span (start, end, and other location information)
// fully contain the other?
Calendar.prototype.spanContainsSpan = function(outerSpan, innerSpan) {
        var eventStart = outerSpan.start.clone().stripZone();
        var eventEnd = this.getEventEnd(outerSpan).stripZone();

        return innerSpan.start >= eventStart && innerSpan.end <= eventEnd;
};


// Returns a list of events that the given event should be compared against when being considered for a move to
// the specified span. Attached to the Calendar's prototype because EventManager is a mixin for a Calendar.
Calendar.prototype.getPeerEvents = function(span, event) {
        var cache = this.getEventCache();
        var peerEvents = [];
        var i, otherEvent;

        for (i = 0; i < cache.length; i++) {
                otherEvent = cache[i];
                if (
                        !event ||
                        event._id !== otherEvent._id // don't compare the event to itself or other related [repeating] events
                ) {
                        peerEvents.push(otherEvent);
                }
        }

        return peerEvents;
};


// updates the "backup" properties, which are preserved in order to compute diffs later on.
function backupEventDates(event) {
        event._allDay = event.allDay;
        event._start = event.start.clone();
        event._end = event.end ? event.end.clone() : null;
}


/* Overlapping / Constraining
-----------------------------------------------------------------------------------------*/


// Determines if the given event can be relocated to the given span (unzoned start/end with other misc data)
Calendar.prototype.isEventSpanAllowed = function(span, event) {
        var source = event.source || {};

        var constraint = firstDefined(
                event.constraint,
                source.constraint,
                this.options.eventConstraint
        );

        var overlap = firstDefined(
                event.overlap,
                source.overlap,
                this.options.eventOverlap
        );

        return this.isSpanAllowed(span, constraint, overlap, event) &&
                (!this.options.eventAllow || this.options.eventAllow(span, event) !== false);
};


// Determines if an external event can be relocated to the given span (unzoned start/end with other misc data)
Calendar.prototype.isExternalSpanAllowed = function(eventSpan, eventLocation, eventProps) {
        var eventInput;
        var event;

        // note: very similar logic is in View's reportExternalDrop
        if (eventProps) {
                eventInput = $.extend({}, eventProps, eventLocation);
                event = this.expandEvent(
                        this.buildEventFromInput(eventInput)
                )[0];
        }

        if (event) {
                return this.isEventSpanAllowed(eventSpan, event);
        }
        else { // treat it as a selection

                return this.isSelectionSpanAllowed(eventSpan);
        }
};


// Determines the given span (unzoned start/end with other misc data) can be selected.
Calendar.prototype.isSelectionSpanAllowed = function(span) {
        return this.isSpanAllowed(span, this.options.selectConstraint, this.options.selectOverlap) &&
                (!this.options.selectAllow || this.options.selectAllow(span) !== false);
};


// Returns true if the given span (caused by an event drop/resize or a selection) is allowed to exist
// according to the constraint/overlap settings.
// `event` is not required if checking a selection.
Calendar.prototype.isSpanAllowed = function(span, constraint, overlap, event) {
        var constraintEvents;
        var anyContainment;
        var peerEvents;
        var i, peerEvent;
        var peerOverlap;

        // the range must be fully contained by at least one of produced constraint events
        if (constraint != null) {

                // not treated as an event! intermediate data structure
                // TODO: use ranges in the future
                constraintEvents = this.constraintToEvents(constraint);
                if (constraintEvents) { // not invalid

                        anyContainment = false;
                        for (i = 0; i < constraintEvents.length; i++) {
                                if (this.spanContainsSpan(constraintEvents[i], span)) {
                                        anyContainment = true;
                                        break;
                                }
                        }

                        if (!anyContainment) {
                                return false;
                        }
                }
        }

        peerEvents = this.getPeerEvents(span, event);

        for (i = 0; i < peerEvents.length; i++)  {
                peerEvent = peerEvents[i];

                // there needs to be an actual intersection before disallowing anything
                if (this.eventIntersectsRange(peerEvent, span)) {

                        // evaluate overlap for the given range and short-circuit if necessary
                        if (overlap === false) {
                                return false;
                        }
                        // if the event's overlap is a test function, pass the peer event in question as the first param
                        else if (typeof overlap === 'function' && !overlap(peerEvent, event)) {
                                return false;
                        }

                        // if we are computing if the given range is allowable for an event, consider the other event's
                        // EventObject-specific or Source-specific `overlap` property
                        if (event) {
                                peerOverlap = firstDefined(
                                        peerEvent.overlap,
                                        (peerEvent.source || {}).overlap
                                        // we already considered the global `eventOverlap`
                                );
                                if (peerOverlap === false) {
                                        return false;
                                }
                                // if the peer event's overlap is a test function, pass the subject event as the first param
                                if (typeof peerOverlap === 'function' && !peerOverlap(event, peerEvent)) {
                                        return false;
                                }
                        }
                }
        }

        return true;
};


// Given an event input from the API, produces an array of event objects. Possible event inputs:
// 'businessHours'
// An event ID (number or string)
// An object with specific start/end dates or a recurring event (like what businessHours accepts)
Calendar.prototype.constraintToEvents = function(constraintInput) {

        if (constraintInput === 'businessHours') {
                return this.getCurrentBusinessHourEvents();
        }

        if (typeof constraintInput === 'object') {
                if (constraintInput.start != null) { // needs to be event-like input
                        return this.expandEvent(this.buildEventFromInput(constraintInput));
                }
                else {
                        return null; // invalid
                }
        }

        return this.clientEvents(constraintInput); // probably an ID
};


// Does the event's date range intersect with the given range?
// start/end already assumed to have stripped zones :(
Calendar.prototype.eventIntersectsRange = function(event, range) {
        var eventStart = event.start.clone().stripZone();
        var eventEnd = this.getEventEnd(event).stripZone();

        return range.start < eventEnd && range.end > eventStart;
};


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

var BUSINESS_HOUR_EVENT_DEFAULTS = {
        id: '_fcBusinessHours', // will relate events from different calls to expandEvent
        start: '09:00',
        end: '17:00',
        dow: [ 1, 2, 3, 4, 5 ], // monday - friday
        rendering: 'inverse-background'
        // classNames are defined in businessHoursSegClasses
};

// Return events objects for business hours within the current view.
// Abuse of our event system :(
Calendar.prototype.getCurrentBusinessHourEvents = function(wholeDay) {
        return this.computeBusinessHourEvents(wholeDay, this.options.businessHours);
};

// Given a raw input value from options, return events objects for business hours within the current view.
Calendar.prototype.computeBusinessHourEvents = function(wholeDay, input) {
        if (input === true) {
                return this.expandBusinessHourEvents(wholeDay, [ {} ]);
        }
        else if ($.isPlainObject(input)) {
                return this.expandBusinessHourEvents(wholeDay, [ input ]);
        }
        else if ($.isArray(input)) {
                return this.expandBusinessHourEvents(wholeDay, input, true);
        }
        else {
                return [];
        }
};

// inputs expected to be an array of objects.
// if ignoreNoDow is true, will ignore entries that don't specify a day-of-week (dow) key.
Calendar.prototype.expandBusinessHourEvents = function(wholeDay, inputs, ignoreNoDow) {
        var view = this.getView();
        var events = [];
        var i, input;

        for (i = 0; i < inputs.length; i++) {
                input = inputs[i];

                if (ignoreNoDow && !input.dow) {
                        continue;
                }

                // give defaults. will make a copy
                input = $.extend({}, BUSINESS_HOUR_EVENT_DEFAULTS, input);

                // if a whole-day series is requested, clear the start/end times
                if (wholeDay) {
                        input.start = null;
                        input.end = null;
                }

                events.push.apply(events, // append
                        this.expandEvent(
                                this.buildEventFromInput(input),
                                view.start,
                                view.end
                        )
                );
        }

        return events;
};

;;

/* 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.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);
        },


        // Sets the display range and computes all necessary dates
        setRange: function(range) {
                View.prototype.setRange.call(this, range); // call the super-method

                this.dayGrid.breakOnWeeks = /year|month|week/.test(this.intervalUnit); // do before setRange
                this.dayGrid.setRange(range);
        },


        // Compute the value to feed into setRange. Overrides superclass.
        computeRange: function(date) {
                var range = View.prototype.computeRange.call(this, date); // get value from the super-method

                // year and month views should be aligned with weeks. this is already done for week
                if (/year|month/.test(range.intervalUnit)) {
                        range.start.startOf('week');
                        range.start = this.skipHiddenDays(range.start);

                        // make end-of-week if not already
                        if (range.end.weekday()) {
                                range.end.add(1, 'week').startOf('week');
                                range.end = this.skipHiddenDays(range.end, -1, true); // exclusively move backwards
                        }
                }

                return range;
        },


        // Renders the view into `this.el`, which should already be assigned
        renderDates: function() {

                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();
        },


        renderBusinessHours: function() {
                this.dayGrid.renderBusinessHours();
        },


        unrenderBusinessHours: function() {
                this.dayGrid.unrenderBusinessHours();
        },


        // Builds the HTML skeleton for the view.
        // The day-grid component will render inside of a container defined by this HTML.
        renderSkeletonHtml: function() {
                return '' +
                        '<table>' +
                                '<thead class="fc-head">' +
                                        '<tr>' +
                                                '<td class="fc-head-container ' + this.widgetHeaderClass + '"></td>' +
                                        '</tr>' +
                                '</thead>' +
                                '<tbody class="fc-body">' +
                                        '<tr>' +
                                                '<td class="' + this.widgetContentClass + '"></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
        ------------------------------------------------------------------------------------------------------------------*/


        computeInitialScroll: function() {
                return { top: 0 };
        },


        queryScroll: function() {
                return { top: this.scroller.getScrollTop() };
        },


        setScroll: function(scroll) {
                this.scroller.setScrollTop(scroll.top);
        },


        /* Hit Areas
        ------------------------------------------------------------------------------------------------------------------*/
        // forward all hit-related method calls to dayGrid


        hitsNeeded: function() {
                this.dayGrid.hitsNeeded();
        },


        hitsNotNeeded: function() {
                this.dayGrid.hitsNotNeeded();
        },


        prepareHits: function() {
                this.dayGrid.prepareHits();
        },


        releaseHits: function() {
                this.dayGrid.releaseHits();
        },


        queryHit: function(left, top) {
                return this.dayGrid.queryHit(left, top);
        },


        getHitSpan: function(hit) {
                return this.dayGrid.getHitSpan(hit);
        },


        getHitEl: function(hit) {
                return this.dayGrid.getHitEl(hit);
        },


        /* Events
        ------------------------------------------------------------------------------------------------------------------*/


        // Renders the given events onto the view and populates the segments array
        renderEvents: function(events) {
                this.dayGrid.renderEvents(events);

                this.updateHeight(); // must compensate for events that overflow the row
        },


        // Retrieves all segment objects that are rendered in the view
        getEventSegs: function() {
                return this.dayGrid.getEventSegs();
        },


        // Unrenders all event elements and clears internal segment data
        unrenderEvents: function() {
                this.dayGrid.unrenderEvents();

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


        /* Dragging (for both events and external elements)
        ------------------------------------------------------------------------------------------------------------------*/


        // A returned value of `true` signals that a mock "helper" event has been rendered.
        renderDrag: function(dropLocation, seg) {
                return this.dayGrid.renderDrag(dropLocation, seg);
        },


        unrenderDrag: function() {
                this.dayGrid.unrenderDrag();
        },


        /* Selection
        ------------------------------------------------------------------------------------------------------------------*/


        // Renders a visual indication of a selection
        renderSelection: function(span) {
                this.dayGrid.renderSelection(span);
        },


        // Unrenders a visual indications of a selection
        unrenderSelection: function() {
                this.dayGrid.unrenderSelection();
        }

});


// 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.widgetHeaderClass + '" ' + view.weekNumberStyleAttr() + '>' +
                                        '<span>' + // needed for matchCellWidths
                                                htmlEscape(view.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.widgetContentClass + '" ' +
                                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({

        // Produces information about what range to display
        computeRange: function(date) {
                var range = BasicView.prototype.computeRange.call(this, date); // get value from super-method
                var rowCnt;

                // ensure 6 weeks
                if (this.isFixedWeeks()) {
                        rowCnt = Math.ceil(range.end.diff(range.start, 'weeks', true)); // could be partial weeks due to hiddenDays
                        range.end.add(6 - rowCnt, 'weeks');
                }

                return range;
        },


        // 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');
        }

});

;;

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,


        initialize: function() {
                this.timeGrid = this.instantiateTimeGrid();

                if (this.opt('allDaySlot')) { // should we display the "all-day" area?
                        this.dayGrid = this.instantiateDayGrid(); // the all-day subcomponent of this view
                }

                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
        ------------------------------------------------------------------------------------------------------------------*/


        // Sets the display range and computes all necessary dates
        setRange: function(range) {
                View.prototype.setRange.call(this, range); // call the super-method

                this.timeGrid.setRange(range);
                if (this.dayGrid) {
                        this.dayGrid.setRange(range);
                }
        },


        // Renders the view into `this.el`, which has already been assigned
        renderDates: function() {

                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.widgetHeaderClass + '"/>')
                        .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.
        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() {
                return '' +
                        '<table>' +
                                '<thead class="fc-head">' +
                                        '<tr>' +
                                                '<td class="fc-head-container ' + this.widgetHeaderClass + '"></td>' +
                                        '</tr>' +
                                '</thead>' +
                                '<tbody class="fc-body">' +
                                        '<tr>' +
                                                '<td class="' + this.widgetContentClass + '">' +
                                                        (this.dayGrid ?
                                                                '<div class="fc-day-grid"/>' +
                                                                '<hr class="fc-divider ' + this.widgetHeaderClass + '"/>' :
                                                                ''
                                                                ) +
                                                '</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 '';
        },


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


        renderBusinessHours: function() {
                this.timeGrid.renderBusinessHours();

                if (this.dayGrid) {
                        this.dayGrid.renderBusinessHours();
                }
        },


        unrenderBusinessHours: function() {
                this.timeGrid.unrenderBusinessHours();

                if (this.dayGrid) {
                        this.dayGrid.unrenderBusinessHours();
                }
        },


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


        getNowIndicatorUnit: function() {
                return this.timeGrid.getNowIndicatorUnit();
        },


        renderNowIndicator: function(date) {
                this.timeGrid.renderNowIndicator(date);
        },


        unrenderNowIndicator: function() {
                this.timeGrid.unrenderNowIndicator();
        },


        /* 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
        computeInitialScroll: 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 };
        },


        queryScroll: function() {
                return { top: this.scroller.getScrollTop() };
        },


        setScroll: function(scroll) {
                this.scroller.setScrollTop(scroll.top);
        },


        /* Hit Areas
        ------------------------------------------------------------------------------------------------------------------*/
        // forward all hit-related method calls to the grids (dayGrid might not be defined)


        hitsNeeded: function() {
                this.timeGrid.hitsNeeded();
                if (this.dayGrid) {
                        this.dayGrid.hitsNeeded();
                }
        },


        hitsNotNeeded: function() {
                this.timeGrid.hitsNotNeeded();
                if (this.dayGrid) {
                        this.dayGrid.hitsNotNeeded();
                }
        },


        prepareHits: function() {
                this.timeGrid.prepareHits();
                if (this.dayGrid) {
                        this.dayGrid.prepareHits();
                }
        },


        releaseHits: function() {
                this.timeGrid.releaseHits();
                if (this.dayGrid) {
                        this.dayGrid.releaseHits();
                }
        },


        queryHit: function(left, top) {
                var hit = this.timeGrid.queryHit(left, top);

                if (!hit && this.dayGrid) {
                        hit = this.dayGrid.queryHit(left, top);
                }

                return hit;
        },


        getHitSpan: function(hit) {
                // TODO: hit.component is set as a hack to identify where the hit came from
                return hit.component.getHitSpan(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
        renderEvents: function(events) {
                var dayEvents = [];
                var timedEvents = [];
                var daySegs = [];
                var timedSegs;
                var i;

                // separate the events into all-day and timed
                for (i = 0; i < events.length; i++) {
                        if (events[i].allDay) {
                                dayEvents.push(events[i]);
                        }
                        else {
                                timedEvents.push(events[i]);
                        }
                }

                // render the events in the subcomponents
                timedSegs = this.timeGrid.renderEvents(timedEvents);
                if (this.dayGrid) {
                        daySegs = this.dayGrid.renderEvents(dayEvents);
                }

                // the all-day area is flexible and might have a lot of events, so shift the height
                this.updateHeight();
        },


        // Retrieves all segment objects that are rendered in the view
        getEventSegs: function() {
                return this.timeGrid.getEventSegs().concat(
                        this.dayGrid ? this.dayGrid.getEventSegs() : []
                );
        },


        // Unrenders all event elements and clears internal segment data
        unrenderEvents: function() {

                // unrender the events in the subcomponents
                this.timeGrid.unrenderEvents();
                if (this.dayGrid) {
                        this.dayGrid.unrenderEvents();
                }

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


        /* Dragging (for events and external elements)
        ------------------------------------------------------------------------------------------------------------------*/


        // A returned value of `true` signals that a mock "helper" event has been rendered.
        renderDrag: function(dropLocation, seg) {
                if (dropLocation.start.hasTime()) {
                        return this.timeGrid.renderDrag(dropLocation, seg);
                }
                else if (this.dayGrid) {
                        return this.dayGrid.renderDrag(dropLocation, seg);
                }
        },


        unrenderDrag: function() {
                this.timeGrid.unrenderDrag();
                if (this.dayGrid) {
                        this.dayGrid.unrenderDrag();
                }
        },


        /* Selection
        ------------------------------------------------------------------------------------------------------------------*/


        // Renders a visual indication of a selection
        renderSelection: function(span) {
                if (span.start.hasTime() || span.end.hasTime()) {
                        this.timeGrid.renderSelection(span);
                }
                else if (this.dayGrid) {
                        this.dayGrid.renderSelection(span);
                }
        },


        // Unrenders a visual indications of a selection
        unrenderSelection: function() {
                this.timeGrid.unrenderSelection();
                if (this.dayGrid) {
                        this.dayGrid.unrenderSelection();
                }
        }

});


// 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 weekText;

                if (view.opt('weekNumbers')) {
                        weekText = this.start.format(view.opt('smallWeekFormat'));

                        return '' +
                                '<th class="fc-axis fc-week-number ' + view.widgetHeaderClass + '" ' + view.axisStyleAttr() + '>' +
                                        view.buildGotoAnchorHtml( // aside from link, important for matchCellWidths
                                                { date: this.start, type: 'week', forceOff: this.colCnt > 1 },
                                                htmlEscape(weekText) // inner HTML
                                        ) +
                                '</th>';
                }
                else {
                        return '<th class="fc-axis ' + view.widgetHeaderClass + '" ' + 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.widgetContentClass + '" ' + 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.widgetContentClass + '" ' + 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',
                minTime: '00:00:00',
                maxTime: '24:00:00',
                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.scroller = new Scroller({
                        overflowX: 'hidden',
                        overflowY: 'auto'
                });
        },

        setRange: function(range) {
                View.prototype.setRange.call(this, range); // super

                this.grid.setRange(range); // needs to process range-related options
        },

        renderSkeleton: function() {
                this.el.addClass(
                        'fc-list-view ' +
                        this.widgetContentClass
                );

                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
        },

        renderEvents: function(events) {
                this.grid.renderEvents(events);
        },

        unrenderEvents: function() {
                this.grid.unrenderEvents();
        },

        isEventResizable: function(event) {
                return false;
        },

        isEventDraggable: function(event) {
                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({

        segSelector: '.fc-list-item', // which elements accept event actions
        hasDayInteractions: false, // no day selection or day clicking

        // slices by day
        spanToSegs: function(span) {
                var view = this.view;
                var dayStart = view.start.clone().time(0); // timed, so segs get times!
                var dayIndex = 0;
                var seg;
                var segs = [];

                while (dayStart < view.end) {

                        seg = intersectRanges(span, {
                                start: dayStart,
                                end: dayStart.clone().add(1, 'day')
                        });

                        if (seg) {
                                seg.dayIndex = dayIndex;
                                segs.push(seg);
                        }

                        dayStart.add(1, 'day');
                        dayIndex++;

                        // detect when span won't go fully into the next day,
                        // and mutate the latest seg to the be the end.
                        if (
                                seg && !seg.isEnd && span.end.hasTime() &&
                                span.end < dayStart.clone().add(this.view.nextDayThreshold)
                        ) {
                                seg.end = span.end.clone();
                                seg.isEnd = true;
                                break;
                        }
                }

                return segs;
        },

        // like "4:00am"
        computeEventTimeFormat: function() {
                return this.view.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.event.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.view.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"><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.view.start.clone().add(dayIndex, 'days')
                                ));

                                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 = view.opt('listDayFormat');
                var altFormat = view.opt('listDayAltFormat');

                return '<tr class="fc-list-heading" data-date="' + dayDate.format('YYYY-MM-DD') + '">' +
                        '<td class="' + view.widgetHeaderClass + '" 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 classes = [ 'fc-list-item' ].concat(this.getSegCustomClasses(seg));
                var bgColor = this.getSegBackgroundColor(seg);
                var event = seg.event;
                var url = event.url;
                var timeHtml;

                if (event.allDay) {
                        timeHtml = view.getAllDayHtml();
                }
                else if (view.isMultiDayEvent(event)) { // if the event appears to span more than one day
                        if (seg.isStart || seg.isEnd) { // outer segment that probably lasts part of the day
                                timeHtml = htmlEscape(this.getEventTimeText(seg));
                        }
                        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(event));
                }

                if (url) {
                        classes.push('fc-has-url');
                }

                return '<tr class="' + classes.join(' ') + '">' +
                        (this.displayEventTime ?
                                '<td class="fc-list-item-time ' + view.widgetContentClass + '">' +
                                        (timeHtml || '') +
                                '</td>' :
                                '') +
                        '<td class="fc-list-item-marker ' + view.widgetContentClass + '">' +
                                '<span class="fc-event-dot"' +
                                (bgColor ?
                                        ' style="background-color:' + bgColor + '"' :
                                        '') +
                                '></span>' +
                        '</td>' +
                        '<td class="fc-list-item-title ' + view.widgetContentClass + '">' +
                                '<a' + (url ? ' href="' + htmlEscape(url) + '"' : '') + '>' +
                                        htmlEscape(seg.event.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
});