resources/src/mediawiki/mediawiki.notification.js

   1 ( function ( mw, $ ) {
   2         'use strict';
   3
   4         var notification,
   5                 // The #mw-notification-area div that all notifications are contained inside.
   6                 $area,
   7                 // Number of open notification boxes at any time
   8                 openNotificationCount = 0,
   9                 isPageReady = false,
  10                 preReadyNotifQueue = [],
  11                 rAF = window.requestAnimationFrame || setTimeout;
  12
  13         /**
  14          * A Notification object for 1 message.
  15          *
  16          * The underscore in the name is to avoid a bug <https://github.com/senchalabs/jsduck/issues/304>.
  17          * It is not part of the actual class name.
  18          *
  19          * The constructor is not publicly accessible; use mw.notification#notify instead.
  20          * This does not insert anything into the document (see #start).
  21          *
  22          * @class mw.Notification_
  23          * @alternateClassName mw.Notification
  24          * @constructor
  25          * @private
  26          * @param {mw.Message|jQuery|HTMLElement|string} message
  27          * @param {Object} options
  28          */
  29         function Notification( message, options ) {
  30                 var $notification, $notificationContent;
  31
  32                 $notification = $( '<div class="mw-notification"></div>' )
  33                         .data( 'mw.notification', this )
  34                         .addClass( options.autoHide ? 'mw-notification-autohide' : 'mw-notification-noautohide' );
  35
  36                 if ( options.tag ) {
  37                         // Sanitize options.tag before it is used by any code. (Including Notification class methods)
  38                         options.tag = options.tag.replace( /[ _\-]+/g, '-' ).replace( /[^\-a-z0-9]+/ig, '' );
  39                         if ( options.tag ) {
  40                                 $notification.addClass( 'mw-notification-tag-' + options.tag );
  41                         } else {
  42                                 delete options.tag;
  43                         }
  44                 }
  45
  46                 if ( options.type ) {
  47                         // Sanitize options.type
  48                         options.type = options.type.replace( /[ _\-]+/g, '-' ).replace( /[^\-a-z0-9]+/ig, '' );
  49                         $notification.addClass( 'mw-notification-type-' + options.type );
  50                 }
  51
  52                 if ( options.title ) {
  53                         $( '<div class="mw-notification-title"></div>' )
  54                                 .text( options.title )
  55                                 .appendTo( $notification );
  56                 }
  57
  58                 $notificationContent = $( '<div class="mw-notification-content"></div>' );
  59
  60                 if ( typeof message === 'object' ) {
  61                         // Handle mw.Message objects separately from DOM nodes and jQuery objects
  62                         if ( message instanceof mw.Message ) {
  63                                 $notificationContent.html( message.parse() );
  64                         } else {
  65                                 $notificationContent.append( message );
  66                         }
  67                 } else {
  68                         $notificationContent.text( message );
  69                 }
  70
  71                 $notificationContent.appendTo( $notification );
  72
  73                 // Private state parameters, meant for internal use only
  74                 // autoHideSeconds: Number of seconds to wait before auto-hiding notifications.
  75                 // isOpen: Set to true after .start() is called to avoid double calls.
  76                 //         Set back to false after .close() to avoid duplicating the close animation.
  77                 // isPaused: false after .resume(), true after .pause(). Avoids duplicating or breaking the hide timeouts.
  78                 //           Set to true initially so .start() can call .resume().
  79                 // message: The message passed to the notification. Unused now but may be used in the future
  80                 //          to stop replacement of a tagged notification with another notification using the same message.
  81                 // options: The options passed to the notification with a little sanitization. Used by various methods.
  82                 // $notification: jQuery object containing the notification DOM node.
  83                 // Set hide delay
  84                 this.autoHideSeconds = options.autoHideSeconds;
  85                 this.isOpen = false;
  86                 this.isPaused = true;
  87                 this.message = message;
  88                 this.options = options;
  89                 this.$notification = $notification;
  90         }
  91
  92         /**
  93          * Start the notification. Called automatically by mw.notification#notify
  94          * (possibly asynchronously on document-ready).
  95          *
  96          * This inserts the notification into the page, closes any matching tagged notifications,
  97          * handles the fadeIn animations and replacement transitions, and starts autoHide timers.
  98          *
  99          * @private
 100          */
 101         Notification.prototype.start = function () {
 102                 var options, $notification, $tagMatches, autohideCount;
 103
 104                 $area.show();
 105
 106                 if ( this.isOpen ) {
 107                         return;
 108                 }
 109
 110                 this.isOpen = true;
 111                 openNotificationCount++;
 112
 113                 options = this.options;
 114                 $notification = this.$notification;
 115
 116                 if ( options.tag ) {
 117                         // Find notifications with the same tag
 118                         $tagMatches = $area.find( '.mw-notification-tag-' + options.tag );
 119                 }
 120
 121                 // If we found existing notification with the same tag, replace them
 122                 if ( options.tag && $tagMatches.length ) {
 123
 124                         // While there can be only one "open" notif with a given tag, there can be several
 125                         // matches here because they remain in the DOM until the animation is finished.
 126                         $tagMatches.each( function () {
 127                                 var notif = $( this ).data( 'mw.notification' );
 128                                 if ( notif && notif.isOpen ) {
 129                                         // Detach from render flow with position absolute so that the new tag can
 130                                         // occupy its space instead.
 131                                         notif.$notification
 132                                                 .css( {
 133                                                         position: 'absolute',
 134                                                         width: notif.$notification.width()
 135                                                 } )
 136                                                 .css( notif.$notification.position() )
 137                                                 .addClass( 'mw-notification-replaced' );
 138                                         notif.close();
 139                                 }
 140                         } );
 141
 142                         $notification
 143                                 .insertBefore( $tagMatches.first() )
 144                                 .addClass( 'mw-notification-visible' );
 145                 } else {
 146                         $area.append( $notification );
 147                         rAF( function () {
 148                                 // This frame renders the element in the area (invisible)
 149                                 rAF( function () {
 150                                         $notification.addClass( 'mw-notification-visible' );
 151                                 } );
 152                         } );
 153                 }
 154
 155                 // By default a notification is paused.
 156                 // If this notification is within the first {autoHideLimit} notifications then
 157                 // start the auto-hide timer as soon as it's created.
 158                 autohideCount = $area.find( '.mw-notification-autohide' ).length;
 159                 if ( autohideCount <= notification.autoHideLimit ) {
 160                         this.resume();
 161                 }
 162         };
 163
 164         /**
 165          * Pause any running auto-hide timer for this notification
 166          */
 167         Notification.prototype.pause = function () {
 168                 if ( this.isPaused ) {
 169                         return;
 170                 }
 171                 this.isPaused = true;
 172
 173                 if ( this.timeout ) {
 174                         clearTimeout( this.timeout );
 175                         delete this.timeout;
 176                 }
 177         };
 178
 179         /**
 180          * Start autoHide timer if not already started.
 181          * Does nothing if autoHide is disabled.
 182          * Either to resume from pause or to make the first start.
 183          */
 184         Notification.prototype.resume = function () {
 185                 var notif = this;
 186                 if ( !notif.isPaused ) {
 187                         return;
 188                 }
 189                 // Start any autoHide timeouts
 190                 if ( notif.options.autoHide ) {
 191                         notif.isPaused = false;
 192                         notif.timeout = setTimeout( function () {
 193                                 // Already finished, so don't try to re-clear it
 194                                 delete notif.timeout;
 195                                 notif.close();
 196                         }, this.autoHideSeconds * 1000 );
 197                 }
 198         };
 199
 200         /**
 201          * Close the notification.
 202          */
 203         Notification.prototype.close = function () {
 204                 var notif = this;
 205
 206                 if ( !this.isOpen ) {
 207                         return;
 208                 }
 209
 210                 this.isOpen = false;
 211                 openNotificationCount--;
 212
 213                 // Clear any remaining timeout on close
 214                 this.pause();
 215
 216                 // Remove the mw-notification-autohide class from the notification to avoid
 217                 // having a half-closed notification counted as a notification to resume
 218                 // when handling {autoHideLimit}.
 219                 this.$notification.removeClass( 'mw-notification-autohide' );
 220
 221                 // Now that a notification is being closed. Start auto-hide timers for any
 222                 // notification that has now become one of the first {autoHideLimit} notifications.
 223                 notification.resume();
 224
 225                 rAF( function () {
 226                         notif.$notification.removeClass( 'mw-notification-visible' );
 227
 228                         setTimeout( function () {
 229                                 if ( openNotificationCount === 0 ) {
 230                                         // Hide the area after the last notification closes. Otherwise, the padding on
 231                                         // the area can be obscure content, despite the area being empty/invisible (T54659). // FIXME
 232                                         $area.hide();
 233                                         notif.$notification.remove();
 234                                 } else {
 235                                         notif.$notification.slideUp( 'fast', function () {
 236                                                 $( this ).remove();
 237                                         } );
 238                                 }
 239                         }, 500 );
 240                 } );
 241         };
 242
 243         /**
 244          * Helper function, take a list of notification divs and call
 245          * a function on the Notification instance attached to them.
 246          *
 247          * @private
 248          * @static
 249          * @param {jQuery} $notifications A jQuery object containing notification divs
 250          * @param {string} fn The name of the function to call on the Notification instance
 251          */
 252         function callEachNotification( $notifications, fn ) {
 253                 $notifications.each( function () {
 254                         var notif = $( this ).data( 'mw.notification' );
 255                         if ( notif ) {
 256                                 notif[ fn ]();
 257                         }
 258                 } );
 259         }
 260
 261         /**
 262          * Initialisation.
 263          * Must only be called once, and not before the document is ready.
 264          *
 265          * @ignore
 266          */
 267         function init() {
 268                 var offset,
 269                         isFloating = false;
 270
 271                 $area = $( '<div id="mw-notification-area" class="mw-notification-area mw-notification-area-layout"></div>' )
 272                         // Pause auto-hide timers when the mouse is in the notification area.
 273                         .on( {
 274                                 mouseenter: notification.pause,
 275                                 mouseleave: notification.resume
 276                         } )
 277                         // When clicking on a notification close it.
 278                         .on( 'click', '.mw-notification', function () {
 279                                 var notif = $( this ).data( 'mw.notification' );
 280                                 if ( notif ) {
 281                                         notif.close();
 282                                 }
 283                         } )
 284                         // Stop click events from <a> tags from propogating to prevent clicking.
 285                         // on links from hiding a notification.
 286                         .on( 'click', 'a', function ( e ) {
 287                                 e.stopPropagation();
 288                         } );
 289
 290                 // Prepend the notification area to the content area and save it's object.
 291                 mw.util.$content.prepend( $area );
 292                 offset = $area.offset();
 293                 $area.hide();
 294
 295                 function updateAreaMode() {
 296                         var shouldFloat = window.pageYOffset > offset.top;
 297                         if ( isFloating === shouldFloat ) {
 298                                 return;
 299                         }
 300                         isFloating = shouldFloat;
 301                         $area
 302                                 .toggleClass( 'mw-notification-area-floating', isFloating )
 303                                 .toggleClass( 'mw-notification-area-layout', !isFloating );
 304                 }
 305
 306                 $( window ).on( 'scroll', updateAreaMode );
 307
 308                 // Initial mode
 309                 updateAreaMode();
 310         }
 311
 312         /**
 313          * @class mw.notification
 314          * @singleton
 315          */
 316         notification = {
 317                 /**
 318                  * Pause auto-hide timers for all notifications.
 319                  * Notifications will not auto-hide until resume is called.
 320                  *
 321                  * @see mw.Notification#pause
 322                  */
 323                 pause: function () {
 324                         callEachNotification(
 325                                 $area.children( '.mw-notification' ),
 326                                 'pause'
 327                         );
 328                 },
 329
 330                 /**
 331                  * Resume any paused auto-hide timers from the beginning.
 332                  * Only the first #autoHideLimit timers will be resumed.
 333                  */
 334                 resume: function () {
 335                         callEachNotification(
 336                                 // Only call resume on the first #autoHideLimit notifications.
 337                                 // Exclude noautohide notifications to avoid bugs where #autoHideLimit
 338                                 // `{ autoHide: false }` notifications are at the start preventing any
 339                                 // auto-hide notifications from being autohidden.
 340                                 $area.children( '.mw-notification-autohide' ).slice( 0, notification.autoHideLimit ),
 341                                 'resume'
 342                         );
 343                 },
 344
 345                 /**
 346                  * Display a notification message to the user.
 347                  *
 348                  * @param {HTMLElement|HTMLElement[]|jQuery|mw.Message|string} message
 349                  * @param {Object} options The options to use for the notification.
 350                  *  See #defaults for details.
 351                  * @return {mw.Notification} Notification object
 352                  */
 353                 notify: function ( message, options ) {
 354                         var notif;
 355                         options = $.extend( {}, notification.defaults, options );
 356
 357                         notif = new Notification( message, options );
 358
 359                         if ( isPageReady ) {
 360                                 notif.start();
 361                         } else {
 362                                 preReadyNotifQueue.push( notif );
 363                         }
 364
 365                         return notif;
 366                 },
 367
 368                 /**
 369                  * @property {Object}
 370                  * The defaults for #notify options parameter.
 371                  *
 372                  * - autoHide:
 373                  *   A boolean indicating whether the notifification should automatically
 374                  *   be hidden after shown. Or if it should persist.
 375                  *
 376                  * - autoHideSeconds:
 377                  *   Number of seconds to wait before auto-hiding notifications.
 378                  *
 379                  * - tag:
 380                  *   An optional string. When a notification is tagged only one message
 381                  *   with that tag will be displayed. Trying to display a new notification
 382                  *   with the same tag as one already being displayed will cause the other
 383                  *   notification to be closed and this new notification to open up inside
 384                  *   the same place as the previous notification.
 385                  *
 386                  * - title:
 387                  *   An optional title for the notification. Will be displayed above the
 388                  *   content. Usually in bold.
 389                  *
 390                  * - type:
 391                  *   An optional string for the type of the message used for styling:
 392                  *   Examples: 'info', 'warn', 'error'.
 393                  */
 394                 defaults: {
 395                         autoHide: true,
 396                         autoHideSeconds: 5,
 397                         tag: false,
 398                         title: undefined,
 399                         type: false
 400                 },
 401
 402                 /**
 403                  * @property {number}
 404                  * Maximum number of notifications to count down auto-hide timers for.
 405                  * Only the first #autoHideLimit notifications being displayed will
 406                  * auto-hide. Any notifications further down in the list will only start
 407                  * counting down to auto-hide after the first few messages have closed.
 408                  *
 409                  * This basically represents the number of notifications the user should
 410                  * be able to process in #autoHideSeconds time.
 411                  */
 412                 autoHideLimit: 3
 413         };
 414
 415         $( function () {
 416                 var notif;
 417
 418                 init();
 419
 420                 // Handle pre-ready queue.
 421                 isPageReady = true;
 422                 while ( preReadyNotifQueue.length ) {
 423                         notif = preReadyNotifQueue.shift();
 424                         notif.start();
 425                 }
 426         } );
 427
 428         mw.notification = notification;
 429
 430 }( mediaWiki, jQuery ) );