resources/lib/oojs-ui/oojs-ui-widgets.js

   1 /*!
   2  * OOUI v0.26.0
   3  * https://www.mediawiki.org/wiki/OOUI
   4  *
   5  * Copyright 2011–2018 OOUI Team and other contributors.
   6  * Released under the MIT license
   7  * http://oojs.mit-license.org
   8  *
   9  * Date: 2018-03-21T00:00:53Z
  10  */
  11 ( function ( OO ) {
  12
  13 'use strict';
  14
  15 /**
  16  * DraggableElement is a mixin class used to create elements that can be clicked
  17  * and dragged by a mouse to a new position within a group. This class must be used
  18  * in conjunction with OO.ui.mixin.DraggableGroupElement, which provides a container for
  19  * the draggable elements.
  20  *
  21  * @abstract
  22  * @class
  23  *
  24  * @constructor
  25  * @param {Object} [config] Configuration options
  26  * @cfg {jQuery} [$handle] The part of the element which can be used for dragging, defaults to the whole element
  27  * @cfg {boolean} [draggable] The items are draggable. This can change with #toggleDraggable
  28  *  but the draggable state should be called from the DraggableGroupElement, which updates
  29  *  the whole group
  30  */
  31 OO.ui.mixin.DraggableElement = function OoUiMixinDraggableElement( config ) {
  32         config = config || {};
  33
  34         // Properties
  35         this.index = null;
  36         this.$handle = config.$handle || this.$element;
  37         this.wasHandleUsed = null;
  38
  39         // Initialize and events
  40         this.$element
  41                 .addClass( 'oo-ui-draggableElement' )
  42                 .on( {
  43                         mousedown: this.onDragMouseDown.bind( this ),
  44                         dragstart: this.onDragStart.bind( this ),
  45                         dragover: this.onDragOver.bind( this ),
  46                         dragend: this.onDragEnd.bind( this ),
  47                         drop: this.onDrop.bind( this )
  48                 } );
  49         this.$handle.addClass( 'oo-ui-draggableElement-handle' );
  50         this.toggleDraggable( config.draggable === undefined ? true : !!config.draggable );
  51 };
  52
  53 OO.initClass( OO.ui.mixin.DraggableElement );
  54
  55 /* Events */
  56
  57 /**
  58  * @event dragstart
  59  *
  60  * A dragstart event is emitted when the user clicks and begins dragging an item.
  61  * @param {OO.ui.mixin.DraggableElement} item The item the user has clicked and is dragging with the mouse.
  62  */
  63
  64 /**
  65  * @event dragend
  66  * A dragend event is emitted when the user drags an item and releases the mouse,
  67  * thus terminating the drag operation.
  68  */
  69
  70 /**
  71  * @event drop
  72  * A drop event is emitted when the user drags an item and then releases the mouse button
  73  * over a valid target.
  74  */
  75
  76 /* Static Properties */
  77
  78 /**
  79  * @inheritdoc OO.ui.mixin.ButtonElement
  80  */
  81 OO.ui.mixin.DraggableElement.static.cancelButtonMouseDownEvents = false;
  82
  83 /* Methods */
  84
  85 /**
  86  * Change the draggable state of this widget.
  87  * This allows users to temporarily halt the dragging operations.
  88  *
  89  * @param {boolean} isDraggable Widget supports draggable operations
  90  * @fires draggable
  91  */
  92 OO.ui.mixin.DraggableElement.prototype.toggleDraggable = function ( isDraggable ) {
  93         isDraggable = isDraggable !== undefined ? !!isDraggable : !this.draggable;
  94
  95         if ( this.draggable !== isDraggable ) {
  96                 this.draggable = isDraggable;
  97
  98                 this.$handle.toggleClass( 'oo-ui-draggableElement-undraggable', !this.draggable );
  99
 100                 // We make the entire element draggable, not just the handle, so that
 101                 // the whole element appears to move. wasHandleUsed prevents drags from
 102                 // starting outside the handle
 103                 this.$element.prop( 'draggable', this.draggable );
 104         }
 105 };
 106
 107 /**
 108  * Check the draggable state of this widget
 109  *
 110  * @return {boolean} Widget supports draggable operations
 111  */
 112 OO.ui.mixin.DraggableElement.prototype.isDraggable = function () {
 113         return this.draggable;
 114 };
 115
 116 /**
 117  * Respond to mousedown event.
 118  *
 119  * @private
 120  * @param {jQuery.Event} e Drag event
 121  */
 122 OO.ui.mixin.DraggableElement.prototype.onDragMouseDown = function ( e ) {
 123         if ( !this.isDraggable() ) {
 124                 return;
 125         }
 126
 127         this.wasHandleUsed =
 128                 // Optimization: if the handle is the whole element this is always true
 129                 this.$handle[ 0 ] === this.$element[ 0 ] ||
 130                 // Check the mousedown occurred inside the handle
 131                 OO.ui.contains( this.$handle[ 0 ], e.target, true );
 132 };
 133
 134 /**
 135  * Respond to dragstart event.
 136  *
 137  * @private
 138  * @param {jQuery.Event} e Drag event
 139  * @return {boolean} False if the event is cancelled
 140  * @fires dragstart
 141  */
 142 OO.ui.mixin.DraggableElement.prototype.onDragStart = function ( e ) {
 143         var element = this,
 144                 dataTransfer = e.originalEvent.dataTransfer;
 145
 146         if ( !this.wasHandleUsed || !this.isDraggable() ) {
 147                 return false;
 148         }
 149
 150         // Define drop effect
 151         dataTransfer.dropEffect = 'none';
 152         dataTransfer.effectAllowed = 'move';
 153         // Support: Firefox
 154         // We must set up a dataTransfer data property or Firefox seems to
 155         // ignore the fact the element is draggable.
 156         try {
 157                 dataTransfer.setData( 'application-x/OOUI-draggable', this.getIndex() );
 158         } catch ( err ) {
 159                 // The above is only for Firefox. Move on if it fails.
 160         }
 161         // Briefly add a 'clone' class to style the browser's native drag image
 162         this.$element.addClass( 'oo-ui-draggableElement-clone' );
 163         // Add placeholder class after the browser has rendered the clone
 164         setTimeout( function () {
 165                 element.$element
 166                         .removeClass( 'oo-ui-draggableElement-clone' )
 167                         .addClass( 'oo-ui-draggableElement-placeholder' );
 168         } );
 169         // Emit event
 170         this.emit( 'dragstart', this );
 171         return true;
 172 };
 173
 174 /**
 175  * Respond to dragend event.
 176  *
 177  * @private
 178  * @fires dragend
 179  */
 180 OO.ui.mixin.DraggableElement.prototype.onDragEnd = function () {
 181         this.$element.removeClass( 'oo-ui-draggableElement-placeholder' );
 182         this.emit( 'dragend' );
 183 };
 184
 185 /**
 186  * Handle drop event.
 187  *
 188  * @private
 189  * @param {jQuery.Event} e Drop event
 190  * @fires drop
 191  */
 192 OO.ui.mixin.DraggableElement.prototype.onDrop = function ( e ) {
 193         e.preventDefault();
 194         this.emit( 'drop', e );
 195 };
 196
 197 /**
 198  * In order for drag/drop to work, the dragover event must
 199  * return false and stop propogation.
 200  *
 201  * @param {jQuery.Event} e Drag event
 202  * @private
 203  */
 204 OO.ui.mixin.DraggableElement.prototype.onDragOver = function ( e ) {
 205         e.preventDefault();
 206 };
 207
 208 /**
 209  * Set item index.
 210  * Store it in the DOM so we can access from the widget drag event
 211  *
 212  * @private
 213  * @param {number} index Item index
 214  */
 215 OO.ui.mixin.DraggableElement.prototype.setIndex = function ( index ) {
 216         if ( this.index !== index ) {
 217                 this.index = index;
 218                 this.$element.data( 'index', index );
 219         }
 220 };
 221
 222 /**
 223  * Get item index
 224  *
 225  * @private
 226  * @return {number} Item index
 227  */
 228 OO.ui.mixin.DraggableElement.prototype.getIndex = function () {
 229         return this.index;
 230 };
 231
 232 /**
 233  * DraggableGroupElement is a mixin class used to create a group element to
 234  * contain draggable elements, which are items that can be clicked and dragged by a mouse.
 235  * The class is used with OO.ui.mixin.DraggableElement.
 236  *
 237  * @abstract
 238  * @class
 239  * @mixins OO.ui.mixin.GroupElement
 240  *
 241  * @constructor
 242  * @param {Object} [config] Configuration options
 243  * @cfg {string} [orientation] Item orientation: 'horizontal' or 'vertical'. The orientation
 244  *  should match the layout of the items. Items displayed in a single row
 245  *  or in several rows should use horizontal orientation. The vertical orientation should only be
 246  *  used when the items are displayed in a single column. Defaults to 'vertical'
 247  * @cfg {boolean} [draggable] The items are draggable. This can change with #toggleDraggable
 248  */
 249 OO.ui.mixin.DraggableGroupElement = function OoUiMixinDraggableGroupElement( config ) {
 250         // Configuration initialization
 251         config = config || {};
 252
 253         // Parent constructor
 254         OO.ui.mixin.GroupElement.call( this, config );
 255
 256         // Properties
 257         this.orientation = config.orientation || 'vertical';
 258         this.dragItem = null;
 259         this.itemKeys = {};
 260         this.dir = null;
 261         this.itemsOrder = null;
 262         this.draggable = config.draggable === undefined ? true : !!config.draggable;
 263
 264         // Events
 265         this.aggregate( {
 266                 dragstart: 'itemDragStart',
 267                 dragend: 'itemDragEnd',
 268                 drop: 'itemDrop'
 269         } );
 270         this.connect( this, {
 271                 itemDragStart: 'onItemDragStart',
 272                 itemDrop: 'onItemDropOrDragEnd',
 273                 itemDragEnd: 'onItemDropOrDragEnd'
 274         } );
 275
 276         // Initialize
 277         if ( Array.isArray( config.items ) ) {
 278                 this.addItems( config.items );
 279         }
 280         this.$element
 281                 .addClass( 'oo-ui-draggableGroupElement' )
 282                 .toggleClass( 'oo-ui-draggableGroupElement-horizontal', this.orientation === 'horizontal' );
 283 };
 284
 285 /* Setup */
 286 OO.mixinClass( OO.ui.mixin.DraggableGroupElement, OO.ui.mixin.GroupElement );
 287
 288 /* Events */
 289
 290 /**
 291  * An item has been dragged to a new position, but not yet dropped.
 292  *
 293  * @event drag
 294  * @param {OO.ui.mixin.DraggableElement} item Dragged item
 295  * @param {number} [newIndex] New index for the item
 296  */
 297
 298 /**
 299  * An item has been dropped at a new position.
 300  *
 301  * @event reorder
 302  * @param {OO.ui.mixin.DraggableElement} item Reordered item
 303  * @param {number} [newIndex] New index for the item
 304  */
 305
 306 /**
 307  * Draggable state of this widget has changed.
 308  *
 309  * @event draggable
 310  * @param {boolean} [draggable] Widget is draggable
 311  */
 312
 313 /* Methods */
 314
 315 /**
 316  * Change the draggable state of this widget.
 317  * This allows users to temporarily halt the dragging operations.
 318  *
 319  * @param {boolean} isDraggable Widget supports draggable operations
 320  * @fires draggable
 321  */
 322 OO.ui.mixin.DraggableGroupElement.prototype.toggleDraggable = function ( isDraggable ) {
 323         isDraggable = isDraggable !== undefined ? !!isDraggable : !this.draggable;
 324
 325         if ( this.draggable !== isDraggable ) {
 326                 this.draggable = isDraggable;
 327
 328                 // Tell the items their draggable state changed
 329                 this.getItems().forEach( function ( item ) {
 330                         item.toggleDraggable( this.draggable );
 331                 }.bind( this ) );
 332
 333                 // Emit event
 334                 this.emit( 'draggable', this.draggable );
 335         }
 336 };
 337
 338 /**
 339  * Check the draggable state of this widget
 340  *
 341  * @return {boolean} Widget supports draggable operations
 342  */
 343 OO.ui.mixin.DraggableGroupElement.prototype.isDraggable = function () {
 344         return this.draggable;
 345 };
 346
 347 /**
 348  * Respond to item drag start event
 349  *
 350  * @private
 351  * @param {OO.ui.mixin.DraggableElement} item Dragged item
 352  */
 353 OO.ui.mixin.DraggableGroupElement.prototype.onItemDragStart = function ( item ) {
 354         if ( !this.isDraggable() ) {
 355                 return;
 356         }
 357         // Make a shallow copy of this.items so we can re-order it during previews
 358         // without affecting the original array.
 359         this.itemsOrder = this.items.slice();
 360         this.updateIndexes();
 361         if ( this.orientation === 'horizontal' ) {
 362                 // Calculate and cache directionality on drag start - it's a little
 363                 // expensive and it shouldn't change while dragging.
 364                 this.dir = this.$element.css( 'direction' );
 365         }
 366         this.setDragItem( item );
 367 };
 368
 369 /**
 370  * Update the index properties of the items
 371  */
 372 OO.ui.mixin.DraggableGroupElement.prototype.updateIndexes = function () {
 373         var i, len;
 374
 375         // Map the index of each object
 376         for ( i = 0, len = this.itemsOrder.length; i < len; i++ ) {
 377                 this.itemsOrder[ i ].setIndex( i );
 378         }
 379 };
 380
 381 /**
 382  * Handle drop or dragend event and switch the order of the items accordingly
 383  *
 384  * @private
 385  * @param {OO.ui.mixin.DraggableElement} item Dropped item
 386  */
 387 OO.ui.mixin.DraggableGroupElement.prototype.onItemDropOrDragEnd = function () {
 388         var targetIndex, originalIndex,
 389                 item = this.getDragItem();
 390
 391         // TODO: Figure out a way to configure a list of legally droppable
 392         // elements even if they are not yet in the list
 393         if ( item ) {
 394                 originalIndex = this.items.indexOf( item );
 395                 // If the item has moved forward, add one to the index to account for the left shift
 396                 targetIndex = item.getIndex() + ( item.getIndex() > originalIndex ? 1 : 0 );
 397                 if ( targetIndex !== originalIndex ) {
 398                         this.reorder( this.getDragItem(), targetIndex );
 399                         this.emit( 'reorder', this.getDragItem(), targetIndex );
 400                 }
 401                 this.updateIndexes();
 402         }
 403         this.unsetDragItem();
 404         // Return false to prevent propogation
 405         return false;
 406 };
 407
 408 /**
 409  * Respond to dragover event
 410  *
 411  * @private
 412  * @param {jQuery.Event} e Dragover event
 413  * @fires reorder
 414  */
 415 OO.ui.mixin.DraggableGroupElement.prototype.onDragOver = function ( e ) {
 416         var overIndex, targetIndex,
 417                 item = this.getDragItem(),
 418                 dragItemIndex = item.getIndex();
 419
 420         // Get the OptionWidget item we are dragging over
 421         overIndex = $( e.target ).closest( '.oo-ui-draggableElement' ).data( 'index' );
 422
 423         if ( overIndex !== undefined && overIndex !== dragItemIndex ) {
 424                 targetIndex = overIndex + ( overIndex > dragItemIndex ? 1 : 0 );
 425
 426                 if ( targetIndex > 0 ) {
 427                         this.$group.children().eq( targetIndex - 1 ).after( item.$element );
 428                 } else {
 429                         this.$group.prepend( item.$element );
 430                 }
 431                 // Move item in itemsOrder array
 432                 this.itemsOrder.splice( overIndex, 0,
 433                         this.itemsOrder.splice( dragItemIndex, 1 )[ 0 ]
 434                 );
 435                 this.updateIndexes();
 436                 this.emit( 'drag', item, targetIndex );
 437         }
 438         // Prevent default
 439         e.preventDefault();
 440 };
 441
 442 /**
 443  * Reorder the items in the group
 444  *
 445  * @param {OO.ui.mixin.DraggableElement} item Reordered item
 446  * @param {number} newIndex New index
 447  */
 448 OO.ui.mixin.DraggableGroupElement.prototype.reorder = function ( item, newIndex ) {
 449         this.addItems( [ item ], newIndex );
 450 };
 451
 452 /**
 453  * Set a dragged item
 454  *
 455  * @param {OO.ui.mixin.DraggableElement} item Dragged item
 456  */
 457 OO.ui.mixin.DraggableGroupElement.prototype.setDragItem = function ( item ) {
 458         if ( this.dragItem !== item ) {
 459                 this.dragItem = item;
 460                 this.$element.on( 'dragover', this.onDragOver.bind( this ) );
 461                 this.$element.addClass( 'oo-ui-draggableGroupElement-dragging' );
 462         }
 463 };
 464
 465 /**
 466  * Unset the current dragged item
 467  */
 468 OO.ui.mixin.DraggableGroupElement.prototype.unsetDragItem = function () {
 469         if ( this.dragItem ) {
 470                 this.dragItem = null;
 471                 this.$element.off( 'dragover' );
 472                 this.$element.removeClass( 'oo-ui-draggableGroupElement-dragging' );
 473         }
 474 };
 475
 476 /**
 477  * Get the item that is currently being dragged.
 478  *
 479  * @return {OO.ui.mixin.DraggableElement|null} The currently dragged item, or `null` if no item is being dragged
 480  */
 481 OO.ui.mixin.DraggableGroupElement.prototype.getDragItem = function () {
 482         return this.dragItem;
 483 };
 484
 485 /**
 486  * RequestManager is a mixin that manages the lifecycle of a promise-backed request for a widget, such as
 487  * the {@link OO.ui.mixin.LookupElement}.
 488  *
 489  * @class
 490  * @abstract
 491  *
 492  * @constructor
 493  */
 494 OO.ui.mixin.RequestManager = function OoUiMixinRequestManager() {
 495         this.requestCache = {};
 496         this.requestQuery = null;
 497         this.requestRequest = null;
 498 };
 499
 500 /* Setup */
 501
 502 OO.initClass( OO.ui.mixin.RequestManager );
 503
 504 /**
 505  * Get request results for the current query.
 506  *
 507  * @return {jQuery.Promise} Promise object which will be passed response data as the first argument of
 508  *   the done event. If the request was aborted to make way for a subsequent request, this promise
 509  *   may not be rejected, depending on what jQuery feels like doing.
 510  */
 511 OO.ui.mixin.RequestManager.prototype.getRequestData = function () {
 512         var widget = this,
 513                 value = this.getRequestQuery(),
 514                 deferred = $.Deferred(),
 515                 ourRequest;
 516
 517         this.abortRequest();
 518         if ( Object.prototype.hasOwnProperty.call( this.requestCache, value ) ) {
 519                 deferred.resolve( this.requestCache[ value ] );
 520         } else {
 521                 if ( this.pushPending ) {
 522                         this.pushPending();
 523                 }
 524                 this.requestQuery = value;
 525                 ourRequest = this.requestRequest = this.getRequest();
 526                 ourRequest
 527                         .always( function () {
 528                                 // We need to pop pending even if this is an old request, otherwise
 529                                 // the widget will remain pending forever.
 530                                 // TODO: this assumes that an aborted request will fail or succeed soon after
 531                                 // being aborted, or at least eventually. It would be nice if we could popPending()
 532                                 // at abort time, but only if we knew that we hadn't already called popPending()
 533                                 // for that request.
 534                                 if ( widget.popPending ) {
 535                                         widget.popPending();
 536                                 }
 537                         } )
 538                         .done( function ( response ) {
 539                                 // If this is an old request (and aborting it somehow caused it to still succeed),
 540                                 // ignore its success completely
 541                                 if ( ourRequest === widget.requestRequest ) {
 542                                         widget.requestQuery = null;
 543                                         widget.requestRequest = null;
 544                                         widget.requestCache[ value ] = widget.getRequestCacheDataFromResponse( response );
 545                                         deferred.resolve( widget.requestCache[ value ] );
 546                                 }
 547                         } )
 548                         .fail( function () {
 549                                 // If this is an old request (or a request failing because it's being aborted),
 550                                 // ignore its failure completely
 551                                 if ( ourRequest === widget.requestRequest ) {
 552                                         widget.requestQuery = null;
 553                                         widget.requestRequest = null;
 554                                         deferred.reject();
 555                                 }
 556                         } );
 557         }
 558         return deferred.promise();
 559 };
 560
 561 /**
 562  * Abort the currently pending request, if any.
 563  *
 564  * @private
 565  */
 566 OO.ui.mixin.RequestManager.prototype.abortRequest = function () {
 567         var oldRequest = this.requestRequest;
 568         if ( oldRequest ) {
 569                 // First unset this.requestRequest to the fail handler will notice
 570                 // that the request is no longer current
 571                 this.requestRequest = null;
 572                 this.requestQuery = null;
 573                 oldRequest.abort();
 574         }
 575 };
 576
 577 /**
 578  * Get the query to be made.
 579  *
 580  * @protected
 581  * @method
 582  * @abstract
 583  * @return {string} query to be used
 584  */
 585 OO.ui.mixin.RequestManager.prototype.getRequestQuery = null;
 586
 587 /**
 588  * Get a new request object of the current query value.
 589  *
 590  * @protected
 591  * @method
 592  * @abstract
 593  * @return {jQuery.Promise} jQuery AJAX object, or promise object with an .abort() method
 594  */
 595 OO.ui.mixin.RequestManager.prototype.getRequest = null;
 596
 597 /**
 598  * Pre-process data returned by the request from #getRequest.
 599  *
 600  * The return value of this function will be cached, and any further queries for the given value
 601  * will use the cache rather than doing API requests.
 602  *
 603  * @protected
 604  * @method
 605  * @abstract
 606  * @param {Mixed} response Response from server
 607  * @return {Mixed} Cached result data
 608  */
 609 OO.ui.mixin.RequestManager.prototype.getRequestCacheDataFromResponse = null;
 610
 611 /**
 612  * LookupElement is a mixin that creates a {@link OO.ui.MenuSelectWidget menu} of suggested values for
 613  * a {@link OO.ui.TextInputWidget text input widget}. Suggested values are based on the characters the user types
 614  * into the text input field and, in general, the menu is only displayed when the user types. If a suggested value is chosen
 615  * from the lookup menu, that value becomes the value of the input field.
 616  *
 617  * Note that a new menu of suggested items is displayed when a value is chosen from the lookup menu. If this is
 618  * not the desired behavior, disable lookup menus with the #setLookupsDisabled method, then set the value, then
 619  * re-enable lookups.
 620  *
 621  * See the [OOUI demos][1] for an example.
 622  *
 623  * [1]: https://doc.wikimedia.org/oojs-ui/master/demos/#LookupElement-try-inputting-an-integer
 624  *
 625  * @class
 626  * @abstract
 627  * @mixins OO.ui.mixin.RequestManager
 628  *
 629  * @constructor
 630  * @param {Object} [config] Configuration options
 631  * @cfg {jQuery} [$overlay] Overlay for the lookup menu; defaults to relative positioning.
 632  *  See <https://www.mediawiki.org/wiki/OOUI/Concepts#Overlays>.
 633  * @cfg {jQuery} [$container=this.$element] The container element. The lookup menu is rendered beneath the specified element.
 634  * @cfg {boolean} [allowSuggestionsWhenEmpty=false] Request and display a lookup menu when the text input is empty.
 635  *  By default, the lookup menu is not generated and displayed until the user begins to type.
 636  * @cfg {boolean} [highlightFirst=true] Whether the first lookup result should be highlighted (so, that the user can
 637  *  take it over into the input with simply pressing return) automatically or not.
 638  */
 639 OO.ui.mixin.LookupElement = function OoUiMixinLookupElement( config ) {
 640         // Configuration initialization
 641         config = $.extend( { highlightFirst: true }, config );
 642
 643         // Mixin constructors
 644         OO.ui.mixin.RequestManager.call( this, config );
 645
 646         // Properties
 647         this.$overlay = ( config.$overlay === true ? OO.ui.getDefaultOverlay() : config.$overlay ) || this.$element;
 648         this.lookupMenu = new OO.ui.MenuSelectWidget( {
 649                 widget: this,
 650                 input: this,
 651                 $floatableContainer: config.$container || this.$element
 652         } );
 653
 654         this.allowSuggestionsWhenEmpty = config.allowSuggestionsWhenEmpty || false;
 655
 656         this.lookupsDisabled = false;
 657         this.lookupInputFocused = false;
 658         this.lookupHighlightFirstItem = config.highlightFirst;
 659
 660         // Events
 661         this.$input.on( {
 662                 focus: this.onLookupInputFocus.bind( this ),
 663                 blur: this.onLookupInputBlur.bind( this ),
 664                 mousedown: this.onLookupInputMouseDown.bind( this )
 665         } );
 666         this.connect( this, { change: 'onLookupInputChange' } );
 667         this.lookupMenu.connect( this, {
 668                 toggle: 'onLookupMenuToggle',
 669                 choose: 'onLookupMenuItemChoose'
 670         } );
 671
 672         // Initialization
 673         this.$input.attr( {
 674                 role: 'combobox',
 675                 'aria-owns': this.lookupMenu.getElementId(),
 676                 'aria-autocomplete': 'list'
 677         } );
 678         this.$element.addClass( 'oo-ui-lookupElement' );
 679         this.lookupMenu.$element.addClass( 'oo-ui-lookupElement-menu' );
 680         this.$overlay.append( this.lookupMenu.$element );
 681 };
 682
 683 /* Setup */
 684
 685 OO.mixinClass( OO.ui.mixin.LookupElement, OO.ui.mixin.RequestManager );
 686
 687 /* Methods */
 688
 689 /**
 690  * Handle input focus event.
 691  *
 692  * @protected
 693  * @param {jQuery.Event} e Input focus event
 694  */
 695 OO.ui.mixin.LookupElement.prototype.onLookupInputFocus = function () {
 696         this.lookupInputFocused = true;
 697         this.populateLookupMenu();
 698 };
 699
 700 /**
 701  * Handle input blur event.
 702  *
 703  * @protected
 704  * @param {jQuery.Event} e Input blur event
 705  */
 706 OO.ui.mixin.LookupElement.prototype.onLookupInputBlur = function () {
 707         this.closeLookupMenu();
 708         this.lookupInputFocused = false;
 709 };
 710
 711 /**
 712  * Handle input mouse down event.
 713  *
 714  * @protected
 715  * @param {jQuery.Event} e Input mouse down event
 716  */
 717 OO.ui.mixin.LookupElement.prototype.onLookupInputMouseDown = function () {
 718         // Only open the menu if the input was already focused.
 719         // This way we allow the user to open the menu again after closing it with Esc
 720         // by clicking in the input. Opening (and populating) the menu when initially
 721         // clicking into the input is handled by the focus handler.
 722         if ( this.lookupInputFocused && !this.lookupMenu.isVisible() ) {
 723                 this.populateLookupMenu();
 724         }
 725 };
 726
 727 /**
 728  * Handle input change event.
 729  *
 730  * @protected
 731  * @param {string} value New input value
 732  */
 733 OO.ui.mixin.LookupElement.prototype.onLookupInputChange = function () {
 734         if ( this.lookupInputFocused ) {
 735                 this.populateLookupMenu();
 736         }
 737 };
 738
 739 /**
 740  * Handle the lookup menu being shown/hidden.
 741  *
 742  * @protected
 743  * @param {boolean} visible Whether the lookup menu is now visible.
 744  */
 745 OO.ui.mixin.LookupElement.prototype.onLookupMenuToggle = function ( visible ) {
 746         if ( !visible ) {
 747                 // When the menu is hidden, abort any active request and clear the menu.
 748                 // This has to be done here in addition to closeLookupMenu(), because
 749                 // MenuSelectWidget will close itself when the user presses Esc.
 750                 this.abortLookupRequest();
 751                 this.lookupMenu.clearItems();
 752         }
 753 };
 754
 755 /**
 756  * Handle menu item 'choose' event, updating the text input value to the value of the clicked item.
 757  *
 758  * @protected
 759  * @param {OO.ui.MenuOptionWidget} item Selected item
 760  */
 761 OO.ui.mixin.LookupElement.prototype.onLookupMenuItemChoose = function ( item ) {
 762         this.setValue( item.getData() );
 763 };
 764
 765 /**
 766  * Get lookup menu.
 767  *
 768  * @private
 769  * @return {OO.ui.MenuSelectWidget}
 770  */
 771 OO.ui.mixin.LookupElement.prototype.getLookupMenu = function () {
 772         return this.lookupMenu;
 773 };
 774
 775 /**
 776  * Disable or re-enable lookups.
 777  *
 778  * When lookups are disabled, calls to #populateLookupMenu will be ignored.
 779  *
 780  * @param {boolean} disabled Disable lookups
 781  */
 782 OO.ui.mixin.LookupElement.prototype.setLookupsDisabled = function ( disabled ) {
 783         this.lookupsDisabled = !!disabled;
 784 };
 785
 786 /**
 787  * Open the menu. If there are no entries in the menu, this does nothing.
 788  *
 789  * @private
 790  * @chainable
 791  */
 792 OO.ui.mixin.LookupElement.prototype.openLookupMenu = function () {
 793         if ( !this.lookupMenu.isEmpty() ) {
 794                 this.lookupMenu.toggle( true );
 795         }
 796         return this;
 797 };
 798
 799 /**
 800  * Close the menu, empty it, and abort any pending request.
 801  *
 802  * @private
 803  * @chainable
 804  */
 805 OO.ui.mixin.LookupElement.prototype.closeLookupMenu = function () {
 806         this.lookupMenu.toggle( false );
 807         this.abortLookupRequest();
 808         this.lookupMenu.clearItems();
 809         return this;
 810 };
 811
 812 /**
 813  * Request menu items based on the input's current value, and when they arrive,
 814  * populate the menu with these items and show the menu.
 815  *
 816  * If lookups have been disabled with #setLookupsDisabled, this function does nothing.
 817  *
 818  * @private
 819  * @chainable
 820  */
 821 OO.ui.mixin.LookupElement.prototype.populateLookupMenu = function () {
 822         var widget = this,
 823                 value = this.getValue();
 824
 825         if ( this.lookupsDisabled || this.isReadOnly() ) {
 826                 return;
 827         }
 828
 829         // If the input is empty, clear the menu, unless suggestions when empty are allowed.
 830         if ( !this.allowSuggestionsWhenEmpty && value === '' ) {
 831                 this.closeLookupMenu();
 832         // Skip population if there is already a request pending for the current value
 833         } else if ( value !== this.lookupQuery ) {
 834                 this.getLookupMenuItems()
 835                         .done( function ( items ) {
 836                                 widget.lookupMenu.clearItems();
 837                                 if ( items.length ) {
 838                                         widget.lookupMenu
 839                                                 .addItems( items )
 840                                                 .toggle( true );
 841                                         widget.initializeLookupMenuSelection();
 842                                 } else {
 843                                         widget.lookupMenu.toggle( false );
 844                                 }
 845                         } )
 846                         .fail( function () {
 847                                 widget.lookupMenu.clearItems();
 848                         } );
 849         }
 850
 851         return this;
 852 };
 853
 854 /**
 855  * Highlight the first selectable item in the menu, if configured.
 856  *
 857  * @private
 858  * @chainable
 859  */
 860 OO.ui.mixin.LookupElement.prototype.initializeLookupMenuSelection = function () {
 861         if ( this.lookupHighlightFirstItem && !this.lookupMenu.findSelectedItem() ) {
 862                 this.lookupMenu.highlightItem( this.lookupMenu.findFirstSelectableItem() );
 863         }
 864 };
 865
 866 /**
 867  * Get lookup menu items for the current query.
 868  *
 869  * @private
 870  * @return {jQuery.Promise} Promise object which will be passed menu items as the first argument of
 871  *   the done event. If the request was aborted to make way for a subsequent request, this promise
 872  *   will not be rejected: it will remain pending forever.
 873  */
 874 OO.ui.mixin.LookupElement.prototype.getLookupMenuItems = function () {
 875         return this.getRequestData().then( function ( data ) {
 876                 return this.getLookupMenuOptionsFromData( data );
 877         }.bind( this ) );
 878 };
 879
 880 /**
 881  * Abort the currently pending lookup request, if any.
 882  *
 883  * @private
 884  */
 885 OO.ui.mixin.LookupElement.prototype.abortLookupRequest = function () {
 886         this.abortRequest();
 887 };
 888
 889 /**
 890  * Get a new request object of the current lookup query value.
 891  *
 892  * @protected
 893  * @method
 894  * @abstract
 895  * @return {jQuery.Promise} jQuery AJAX object, or promise object with an .abort() method
 896  */
 897 OO.ui.mixin.LookupElement.prototype.getLookupRequest = null;
 898
 899 /**
 900  * Pre-process data returned by the request from #getLookupRequest.
 901  *
 902  * The return value of this function will be cached, and any further queries for the given value
 903  * will use the cache rather than doing API requests.
 904  *
 905  * @protected
 906  * @method
 907  * @abstract
 908  * @param {Mixed} response Response from server
 909  * @return {Mixed} Cached result data
 910  */
 911 OO.ui.mixin.LookupElement.prototype.getLookupCacheDataFromResponse = null;
 912
 913 /**
 914  * Get a list of menu option widgets from the (possibly cached) data returned by
 915  * #getLookupCacheDataFromResponse.
 916  *
 917  * @protected
 918  * @method
 919  * @abstract
 920  * @param {Mixed} data Cached result data, usually an array
 921  * @return {OO.ui.MenuOptionWidget[]} Menu items
 922  */
 923 OO.ui.mixin.LookupElement.prototype.getLookupMenuOptionsFromData = null;
 924
 925 /**
 926  * Set the read-only state of the widget.
 927  *
 928  * This will also disable/enable the lookups functionality.
 929  *
 930  * @param {boolean} readOnly Make input read-only
 931  * @chainable
 932  */
 933 OO.ui.mixin.LookupElement.prototype.setReadOnly = function ( readOnly ) {
 934         // Parent method
 935         // Note: Calling #setReadOnly this way assumes this is mixed into an OO.ui.TextInputWidget
 936         OO.ui.TextInputWidget.prototype.setReadOnly.call( this, readOnly );
 937
 938         // During construction, #setReadOnly is called before the OO.ui.mixin.LookupElement constructor
 939         if ( this.isReadOnly() && this.lookupMenu ) {
 940                 this.closeLookupMenu();
 941         }
 942
 943         return this;
 944 };
 945
 946 /**
 947  * @inheritdoc OO.ui.mixin.RequestManager
 948  */
 949 OO.ui.mixin.LookupElement.prototype.getRequestQuery = function () {
 950         return this.getValue();
 951 };
 952
 953 /**
 954  * @inheritdoc OO.ui.mixin.RequestManager
 955  */
 956 OO.ui.mixin.LookupElement.prototype.getRequest = function () {
 957         return this.getLookupRequest();
 958 };
 959
 960 /**
 961  * @inheritdoc OO.ui.mixin.RequestManager
 962  */
 963 OO.ui.mixin.LookupElement.prototype.getRequestCacheDataFromResponse = function ( response ) {
 964         return this.getLookupCacheDataFromResponse( response );
 965 };
 966
 967 /**
 968  * TabPanelLayouts are used within {@link OO.ui.IndexLayout index layouts} to create tab panels that
 969  * users can select and display from the index's optional {@link OO.ui.TabSelectWidget tab}
 970  * navigation. TabPanels are usually not instantiated directly, rather extended to include the
 971  * required content and functionality.
 972  *
 973  * Each tab panel must have a unique symbolic name, which is passed to the constructor. In addition,
 974  * the tab panel's tab item is customized (with a label) using the #setupTabItem method. See
 975  * {@link OO.ui.IndexLayout IndexLayout} for an example.
 976  *
 977  * @class
 978  * @extends OO.ui.PanelLayout
 979  *
 980  * @constructor
 981  * @param {string} name Unique symbolic name of tab panel
 982  * @param {Object} [config] Configuration options
 983  * @cfg {jQuery|string|Function|OO.ui.HtmlSnippet} [label] Label for tab panel's tab
 984  */
 985 OO.ui.TabPanelLayout = function OoUiTabPanelLayout( name, config ) {
 986         // Allow passing positional parameters inside the config object
 987         if ( OO.isPlainObject( name ) && config === undefined ) {
 988                 config = name;
 989                 name = config.name;
 990         }
 991
 992         // Configuration initialization
 993         config = $.extend( { scrollable: true }, config );
 994
 995         // Parent constructor
 996         OO.ui.TabPanelLayout.parent.call( this, config );
 997
 998         // Properties
 999         this.name = name;
1000         this.label = config.label;
1001         this.tabItem = null;
1002         this.active = false;
1003
1004         // Initialization
1005         this.$element.addClass( 'oo-ui-tabPanelLayout' );
1006 };
1007
1008 /* Setup */
1009
1010 OO.inheritClass( OO.ui.TabPanelLayout, OO.ui.PanelLayout );
1011
1012 /* Events */
1013
1014 /**
1015  * An 'active' event is emitted when the tab panel becomes active. Tab panels become active when they are
1016  * shown in a index layout that is configured to display only one tab panel at a time.
1017  *
1018  * @event active
1019  * @param {boolean} active Tab panel is active
1020  */
1021
1022 /* Methods */
1023
1024 /**
1025  * Get the symbolic name of the tab panel.
1026  *
1027  * @return {string} Symbolic name of tab panel
1028  */
1029 OO.ui.TabPanelLayout.prototype.getName = function () {
1030         return this.name;
1031 };
1032
1033 /**
1034  * Check if tab panel is active.
1035  *
1036  * Tab panels become active when they are shown in a {@link OO.ui.IndexLayout index layout} that is configured to
1037  * display only one tab panel at a time. Additional CSS is applied to the tab panel's tab item to reflect the
1038  * active state.
1039  *
1040  * @return {boolean} Tab panel is active
1041  */
1042 OO.ui.TabPanelLayout.prototype.isActive = function () {
1043         return this.active;
1044 };
1045
1046 /**
1047  * Get tab item.
1048  *
1049  * The tab item allows users to access the tab panel from the index's tab
1050  * navigation. The tab item itself can be customized (with a label, level, etc.) using the #setupTabItem method.
1051  *
1052  * @return {OO.ui.TabOptionWidget|null} Tab option widget
1053  */
1054 OO.ui.TabPanelLayout.prototype.getTabItem = function () {
1055         return this.tabItem;
1056 };
1057
1058 /**
1059  * Set or unset the tab item.
1060  *
1061  * Specify a {@link OO.ui.TabOptionWidget tab option} to set it,
1062  * or `null` to clear the tab item. To customize the tab item itself (e.g., to set a label or tab
1063  * level), use #setupTabItem instead of this method.
1064  *
1065  * @param {OO.ui.TabOptionWidget|null} tabItem Tab option widget, null to clear
1066  * @chainable
1067  */
1068 OO.ui.TabPanelLayout.prototype.setTabItem = function ( tabItem ) {
1069         this.tabItem = tabItem || null;
1070         if ( tabItem ) {
1071                 this.setupTabItem();
1072         }
1073         return this;
1074 };
1075
1076 /**
1077  * Set up the tab item.
1078  *
1079  * Use this method to customize the tab item (e.g., to add a label or tab level). To set or unset
1080  * the tab item itself (with a {@link OO.ui.TabOptionWidget tab option} or `null`), use
1081  * the #setTabItem method instead.
1082  *
1083  * @param {OO.ui.TabOptionWidget} tabItem Tab option widget to set up
1084  * @chainable
1085  */
1086 OO.ui.TabPanelLayout.prototype.setupTabItem = function () {
1087         if ( this.label ) {
1088                 this.tabItem.setLabel( this.label );
1089         }
1090         return this;
1091 };
1092
1093 /**
1094  * Set the tab panel to its 'active' state.
1095  *
1096  * Tab panels become active when they are shown in a index layout that is configured to display only
1097  * one tab panel at a time. Additional CSS is applied to the tab item to reflect the tab panel's
1098  * active state. Outside of the index context, setting the active state on a tab panel does nothing.
1099  *
1100  * @param {boolean} active Tab panel is active
1101  * @fires active
1102  */
1103 OO.ui.TabPanelLayout.prototype.setActive = function ( active ) {
1104         active = !!active;
1105
1106         if ( active !== this.active ) {
1107                 this.active = active;
1108                 this.$element.toggleClass( 'oo-ui-tabPanelLayout-active', this.active );
1109                 this.emit( 'active', this.active );
1110         }
1111 };
1112
1113 /**
1114  * PageLayouts are used within {@link OO.ui.BookletLayout booklet layouts} to create pages that users can select and display
1115  * from the booklet's optional {@link OO.ui.OutlineSelectWidget outline} navigation. Pages are usually not instantiated directly,
1116  * rather extended to include the required content and functionality.
1117  *
1118  * Each page must have a unique symbolic name, which is passed to the constructor. In addition, the page's outline
1119  * item is customized (with a label, outline level, etc.) using the #setupOutlineItem method. See
1120  * {@link OO.ui.BookletLayout BookletLayout} for an example.
1121  *
1122  * @class
1123  * @extends OO.ui.PanelLayout
1124  *
1125  * @constructor
1126  * @param {string} name Unique symbolic name of page
1127  * @param {Object} [config] Configuration options
1128  */
1129 OO.ui.PageLayout = function OoUiPageLayout( name, config ) {
1130         // Allow passing positional parameters inside the config object
1131         if ( OO.isPlainObject( name ) && config === undefined ) {
1132                 config = name;
1133                 name = config.name;
1134         }
1135
1136         // Configuration initialization
1137         config = $.extend( { scrollable: true }, config );
1138
1139         // Parent constructor
1140         OO.ui.PageLayout.parent.call( this, config );
1141
1142         // Properties
1143         this.name = name;
1144         this.outlineItem = null;
1145         this.active = false;
1146
1147         // Initialization
1148         this.$element.addClass( 'oo-ui-pageLayout' );
1149 };
1150
1151 /* Setup */
1152
1153 OO.inheritClass( OO.ui.PageLayout, OO.ui.PanelLayout );
1154
1155 /* Events */
1156
1157 /**
1158  * An 'active' event is emitted when the page becomes active. Pages become active when they are
1159  * shown in a booklet layout that is configured to display only one page at a time.
1160  *
1161  * @event active
1162  * @param {boolean} active Page is active
1163  */
1164
1165 /* Methods */
1166
1167 /**
1168  * Get the symbolic name of the page.
1169  *
1170  * @return {string} Symbolic name of page
1171  */
1172 OO.ui.PageLayout.prototype.getName = function () {
1173         return this.name;
1174 };
1175
1176 /**
1177  * Check if page is active.
1178  *
1179  * Pages become active when they are shown in a {@link OO.ui.BookletLayout booklet layout} that is configured to display
1180  * only one page at a time. Additional CSS is applied to the page's outline item to reflect the active state.
1181  *
1182  * @return {boolean} Page is active
1183  */
1184 OO.ui.PageLayout.prototype.isActive = function () {
1185         return this.active;
1186 };
1187
1188 /**
1189  * Get outline item.
1190  *
1191  * The outline item allows users to access the page from the booklet's outline
1192  * navigation. The outline item itself can be customized (with a label, level, etc.) using the #setupOutlineItem method.
1193  *
1194  * @return {OO.ui.OutlineOptionWidget|null} Outline option widget
1195  */
1196 OO.ui.PageLayout.prototype.getOutlineItem = function () {
1197         return this.outlineItem;
1198 };
1199
1200 /**
1201  * Set or unset the outline item.
1202  *
1203  * Specify an {@link OO.ui.OutlineOptionWidget outline option} to set it,
1204  * or `null` to clear the outline item. To customize the outline item itself (e.g., to set a label or outline
1205  * level), use #setupOutlineItem instead of this method.
1206  *
1207  * @param {OO.ui.OutlineOptionWidget|null} outlineItem Outline option widget, null to clear
1208  * @chainable
1209  */
1210 OO.ui.PageLayout.prototype.setOutlineItem = function ( outlineItem ) {
1211         this.outlineItem = outlineItem || null;
1212         if ( outlineItem ) {
1213                 this.setupOutlineItem();
1214         }
1215         return this;
1216 };
1217
1218 /**
1219  * Set up the outline item.
1220  *
1221  * Use this method to customize the outline item (e.g., to add a label or outline level). To set or unset
1222  * the outline item itself (with an {@link OO.ui.OutlineOptionWidget outline option} or `null`), use
1223  * the #setOutlineItem method instead.
1224  *
1225  * @param {OO.ui.OutlineOptionWidget} outlineItem Outline option widget to set up
1226  * @chainable
1227  */
1228 OO.ui.PageLayout.prototype.setupOutlineItem = function () {
1229         return this;
1230 };
1231
1232 /**
1233  * Set the page to its 'active' state.
1234  *
1235  * Pages become active when they are shown in a booklet layout that is configured to display only one page at a time. Additional
1236  * CSS is applied to the outline item to reflect the page's active state. Outside of the booklet
1237  * context, setting the active state on a page does nothing.
1238  *
1239  * @param {boolean} active Page is active
1240  * @fires active
1241  */
1242 OO.ui.PageLayout.prototype.setActive = function ( active ) {
1243         active = !!active;
1244
1245         if ( active !== this.active ) {
1246                 this.active = active;
1247                 this.$element.toggleClass( 'oo-ui-pageLayout-active', active );
1248                 this.emit( 'active', this.active );
1249         }
1250 };
1251
1252 /**
1253  * StackLayouts contain a series of {@link OO.ui.PanelLayout panel layouts}. By default, only one panel is displayed
1254  * at a time, though the stack layout can also be configured to show all contained panels, one after another,
1255  * by setting the #continuous option to 'true'.
1256  *
1257  *     @example
1258  *     // A stack layout with two panels, configured to be displayed continously
1259  *     var myStack = new OO.ui.StackLayout( {
1260  *         items: [
1261  *             new OO.ui.PanelLayout( {
1262  *                 $content: $( '<p>Panel One</p>' ),
1263  *                 padded: true,
1264  *                 framed: true
1265  *             } ),
1266  *             new OO.ui.PanelLayout( {
1267  *                 $content: $( '<p>Panel Two</p>' ),
1268  *                 padded: true,
1269  *                 framed: true
1270  *             } )
1271  *         ],
1272  *         continuous: true
1273  *     } );
1274  *     $( 'body' ).append( myStack.$element );
1275  *
1276  * @class
1277  * @extends OO.ui.PanelLayout
1278  * @mixins OO.ui.mixin.GroupElement
1279  *
1280  * @constructor
1281  * @param {Object} [config] Configuration options
1282  * @cfg {boolean} [continuous=false] Show all panels, one after another. By default, only one panel is displayed at a time.
1283  * @cfg {OO.ui.Layout[]} [items] Panel layouts to add to the stack layout.
1284  */
1285 OO.ui.StackLayout = function OoUiStackLayout( config ) {
1286         // Configuration initialization
1287         config = $.extend( { scrollable: true }, config );
1288
1289         // Parent constructor
1290         OO.ui.StackLayout.parent.call( this, config );
1291
1292         // Mixin constructors
1293         OO.ui.mixin.GroupElement.call( this, $.extend( {}, config, { $group: this.$element } ) );
1294
1295         // Properties
1296         this.currentItem = null;
1297         this.continuous = !!config.continuous;
1298
1299         // Initialization
1300         this.$element.addClass( 'oo-ui-stackLayout' );
1301         if ( this.continuous ) {
1302                 this.$element.addClass( 'oo-ui-stackLayout-continuous' );
1303                 this.$element.on( 'scroll', OO.ui.debounce( this.onScroll.bind( this ), 250 ) );
1304         }
1305         if ( Array.isArray( config.items ) ) {
1306                 this.addItems( config.items );
1307         }
1308 };
1309
1310 /* Setup */
1311
1312 OO.inheritClass( OO.ui.StackLayout, OO.ui.PanelLayout );
1313 OO.mixinClass( OO.ui.StackLayout, OO.ui.mixin.GroupElement );
1314
1315 /* Events */
1316
1317 /**
1318  * A 'set' event is emitted when panels are {@link #addItems added}, {@link #removeItems removed},
1319  * {@link #clearItems cleared} or {@link #setItem displayed}.
1320  *
1321  * @event set
1322  * @param {OO.ui.Layout|null} item Current panel or `null` if no panel is shown
1323  */
1324
1325 /**
1326  * When used in continuous mode, this event is emitted when the user scrolls down
1327  * far enough such that currentItem is no longer visible.
1328  *
1329  * @event visibleItemChange
1330  * @param {OO.ui.PanelLayout} panel The next visible item in the layout
1331  */
1332
1333 /* Methods */
1334
1335 /**
1336  * Handle scroll events from the layout element
1337  *
1338  * @param {jQuery.Event} e
1339  * @fires visibleItemChange
1340  */
1341 OO.ui.StackLayout.prototype.onScroll = function () {
1342         var currentRect,
1343                 len = this.items.length,
1344                 currentIndex = this.items.indexOf( this.currentItem ),
1345                 newIndex = currentIndex,
1346                 containerRect = this.$element[ 0 ].getBoundingClientRect();
1347
1348         if ( !containerRect || ( !containerRect.top && !containerRect.bottom ) ) {
1349                 // Can't get bounding rect, possibly not attached.
1350                 return;
1351         }
1352
1353         function getRect( item ) {
1354                 return item.$element[ 0 ].getBoundingClientRect();
1355         }
1356
1357         function isVisible( item ) {
1358                 var rect = getRect( item );
1359                 return rect.bottom > containerRect.top && rect.top < containerRect.bottom;
1360         }
1361
1362         currentRect = getRect( this.currentItem );
1363
1364         if ( currentRect.bottom < containerRect.top ) {
1365                 // Scrolled down past current item
1366                 while ( ++newIndex < len ) {
1367                         if ( isVisible( this.items[ newIndex ] ) ) {
1368                                 break;
1369                         }
1370                 }
1371         } else if ( currentRect.top > containerRect.bottom ) {
1372                 // Scrolled up past current item
1373                 while ( --newIndex >= 0 ) {
1374                         if ( isVisible( this.items[ newIndex ] ) ) {
1375                                 break;
1376                         }
1377                 }
1378         }
1379
1380         if ( newIndex !== currentIndex ) {
1381                 this.emit( 'visibleItemChange', this.items[ newIndex ] );
1382         }
1383 };
1384
1385 /**
1386  * Get the current panel.
1387  *
1388  * @return {OO.ui.Layout|null}
1389  */
1390 OO.ui.StackLayout.prototype.getCurrentItem = function () {
1391         return this.currentItem;
1392 };
1393
1394 /**
1395  * Unset the current item.
1396  *
1397  * @private
1398  * @param {OO.ui.StackLayout} layout
1399  * @fires set
1400  */
1401 OO.ui.StackLayout.prototype.unsetCurrentItem = function () {
1402         var prevItem = this.currentItem;
1403         if ( prevItem === null ) {
1404                 return;
1405         }
1406
1407         this.currentItem = null;
1408         this.emit( 'set', null );
1409 };
1410
1411 /**
1412  * Add panel layouts to the stack layout.
1413  *
1414  * Panels will be added to the end of the stack layout array unless the optional index parameter specifies a different
1415  * insertion point. Adding a panel that is already in the stack will move it to the end of the array or the point specified
1416  * by the index.
1417  *
1418  * @param {OO.ui.Layout[]} items Panels to add
1419  * @param {number} [index] Index of the insertion point
1420  * @chainable
1421  */
1422 OO.ui.StackLayout.prototype.addItems = function ( items, index ) {
1423         // Update the visibility
1424         this.updateHiddenState( items, this.currentItem );
1425
1426         // Mixin method
1427         OO.ui.mixin.GroupElement.prototype.addItems.call( this, items, index );
1428
1429         if ( !this.currentItem && items.length ) {
1430                 this.setItem( items[ 0 ] );
1431         }
1432
1433         return this;
1434 };
1435
1436 /**
1437  * Remove the specified panels from the stack layout.
1438  *
1439  * Removed panels are detached from the DOM, not removed, so that they may be reused. To remove all panels,
1440  * you may wish to use the #clearItems method instead.
1441  *
1442  * @param {OO.ui.Layout[]} items Panels to remove
1443  * @chainable
1444  * @fires set
1445  */
1446 OO.ui.StackLayout.prototype.removeItems = function ( items ) {
1447         // Mixin method
1448         OO.ui.mixin.GroupElement.prototype.removeItems.call( this, items );
1449
1450         if ( items.indexOf( this.currentItem ) !== -1 ) {
1451                 if ( this.items.length ) {
1452                         this.setItem( this.items[ 0 ] );
1453                 } else {
1454                         this.unsetCurrentItem();
1455                 }
1456         }
1457
1458         return this;
1459 };
1460
1461 /**
1462  * Clear all panels from the stack layout.
1463  *
1464  * Cleared panels are detached from the DOM, not removed, so that they may be reused. To remove only
1465  * a subset of panels, use the #removeItems method.
1466  *
1467  * @chainable
1468  * @fires set
1469  */
1470 OO.ui.StackLayout.prototype.clearItems = function () {
1471         this.unsetCurrentItem();
1472         OO.ui.mixin.GroupElement.prototype.clearItems.call( this );
1473
1474         return this;
1475 };
1476
1477 /**
1478  * Show the specified panel.
1479  *
1480  * If another panel is currently displayed, it will be hidden.
1481  *
1482  * @param {OO.ui.Layout} item Panel to show
1483  * @chainable
1484  * @fires set
1485  */
1486 OO.ui.StackLayout.prototype.setItem = function ( item ) {
1487         if ( item !== this.currentItem ) {
1488                 this.updateHiddenState( this.items, item );
1489
1490                 if ( this.items.indexOf( item ) !== -1 ) {
1491                         this.currentItem = item;
1492                         this.emit( 'set', item );
1493                 } else {
1494                         this.unsetCurrentItem();
1495                 }
1496         }
1497
1498         return this;
1499 };
1500
1501 /**
1502  * Update the visibility of all items in case of non-continuous view.
1503  *
1504  * Ensure all items are hidden except for the selected one.
1505  * This method does nothing when the stack is continuous.
1506  *
1507  * @private
1508  * @param {OO.ui.Layout[]} items Item list iterate over
1509  * @param {OO.ui.Layout} [selectedItem] Selected item to show
1510  */
1511 OO.ui.StackLayout.prototype.updateHiddenState = function ( items, selectedItem ) {
1512         var i, len;
1513
1514         if ( !this.continuous ) {
1515                 for ( i = 0, len = items.length; i < len; i++ ) {
1516                         if ( !selectedItem || selectedItem !== items[ i ] ) {
1517                                 items[ i ].$element.addClass( 'oo-ui-element-hidden' );
1518                                 items[ i ].$element.attr( 'aria-hidden', 'true' );
1519                         }
1520                 }
1521                 if ( selectedItem ) {
1522                         selectedItem.$element.removeClass( 'oo-ui-element-hidden' );
1523                         selectedItem.$element.removeAttr( 'aria-hidden' );
1524                 }
1525         }
1526 };
1527
1528 /**
1529  * MenuLayouts combine a menu and a content {@link OO.ui.PanelLayout panel}. The menu is positioned relative to the content (after, before, top, or bottom)
1530  * and its size is customized with the #menuSize config. The content area will fill all remaining space.
1531  *
1532  *     @example
1533  *     var menuLayout = new OO.ui.MenuLayout( {
1534  *         position: 'top'
1535  *     } ),
1536  *         menuPanel = new OO.ui.PanelLayout( { padded: true, expanded: true, scrollable: true } ),
1537  *         contentPanel = new OO.ui.PanelLayout( { padded: true, expanded: true, scrollable: true } ),
1538  *         select = new OO.ui.SelectWidget( {
1539  *             items: [
1540  *                 new OO.ui.OptionWidget( {
1541  *                     data: 'before',
1542  *                     label: 'Before',
1543  *                 } ),
1544  *                 new OO.ui.OptionWidget( {
1545  *                     data: 'after',
1546  *                     label: 'After',
1547  *                 } ),
1548  *                 new OO.ui.OptionWidget( {
1549  *                     data: 'top',
1550  *                     label: 'Top',
1551  *                 } ),
1552  *                 new OO.ui.OptionWidget( {
1553  *                     data: 'bottom',
1554  *                     label: 'Bottom',
1555  *                 } )
1556  *              ]
1557  *         } ).on( 'select', function ( item ) {
1558  *            menuLayout.setMenuPosition( item.getData() );
1559  *         } );
1560  *
1561  *     menuLayout.$menu.append(
1562  *         menuPanel.$element.append( '<b>Menu panel</b>', select.$element )
1563  *     );
1564  *     menuLayout.$content.append(
1565  *         contentPanel.$element.append( '<b>Content panel</b>', '<p>Note that the menu is positioned relative to the content panel: top, bottom, after, before.</p>')
1566  *     );
1567  *     $( 'body' ).append( menuLayout.$element );
1568  *
1569  * If menu size needs to be overridden, it can be accomplished using CSS similar to the snippet
1570  * below. MenuLayout's CSS will override the appropriate values with 'auto' or '0' to display the
1571  * menu correctly. If `menuPosition` is known beforehand, CSS rules corresponding to other positions
1572  * may be omitted.
1573  *
1574  *     .oo-ui-menuLayout-menu {
1575  *         height: 200px;
1576  *         width: 200px;
1577  *     }
1578  *     .oo-ui-menuLayout-content {
1579  *         top: 200px;
1580  *         left: 200px;
1581  *         right: 200px;
1582  *         bottom: 200px;
1583  *     }
1584  *
1585  * @class
1586  * @extends OO.ui.Layout
1587  *
1588  * @constructor
1589  * @param {Object} [config] Configuration options
1590  * @cfg {boolean} [expanded=true] Expand the layout to fill the entire parent element.
1591  * @cfg {boolean} [showMenu=true] Show menu
1592  * @cfg {string} [menuPosition='before'] Position of menu: `top`, `after`, `bottom` or `before`
1593  */
1594 OO.ui.MenuLayout = function OoUiMenuLayout( config ) {
1595         // Configuration initialization
1596         config = $.extend( {
1597                 expanded: true,
1598                 showMenu: true,
1599                 menuPosition: 'before'
1600         }, config );
1601
1602         // Parent constructor
1603         OO.ui.MenuLayout.parent.call( this, config );
1604
1605         this.expanded = !!config.expanded;
1606         /**
1607          * Menu DOM node
1608          *
1609          * @property {jQuery}
1610          */
1611         this.$menu = $( '<div>' );
1612         /**
1613          * Content DOM node
1614          *
1615          * @property {jQuery}
1616          */
1617         this.$content = $( '<div>' );
1618
1619         // Initialization
1620         this.$menu
1621                 .addClass( 'oo-ui-menuLayout-menu' );
1622         this.$content.addClass( 'oo-ui-menuLayout-content' );
1623         this.$element
1624                 .addClass( 'oo-ui-menuLayout' );
1625         if ( config.expanded ) {
1626                 this.$element.addClass( 'oo-ui-menuLayout-expanded' );
1627         } else {
1628                 this.$element.addClass( 'oo-ui-menuLayout-static' );
1629         }
1630         this.setMenuPosition( config.menuPosition );
1631         this.toggleMenu( config.showMenu );
1632 };
1633
1634 /* Setup */
1635
1636 OO.inheritClass( OO.ui.MenuLayout, OO.ui.Layout );
1637
1638 /* Methods */
1639
1640 /**
1641  * Toggle menu.
1642  *
1643  * @param {boolean} showMenu Show menu, omit to toggle
1644  * @chainable
1645  */
1646 OO.ui.MenuLayout.prototype.toggleMenu = function ( showMenu ) {
1647         showMenu = showMenu === undefined ? !this.showMenu : !!showMenu;
1648
1649         if ( this.showMenu !== showMenu ) {
1650                 this.showMenu = showMenu;
1651                 this.$element
1652                         .toggleClass( 'oo-ui-menuLayout-showMenu', this.showMenu )
1653                         .toggleClass( 'oo-ui-menuLayout-hideMenu', !this.showMenu );
1654                 this.$menu.attr( 'aria-hidden', this.showMenu ? 'false' : 'true' );
1655         }
1656
1657         return this;
1658 };
1659
1660 /**
1661  * Check if menu is visible
1662  *
1663  * @return {boolean} Menu is visible
1664  */
1665 OO.ui.MenuLayout.prototype.isMenuVisible = function () {
1666         return this.showMenu;
1667 };
1668
1669 /**
1670  * Set menu position.
1671  *
1672  * @param {string} position Position of menu, either `top`, `after`, `bottom` or `before`
1673  * @throws {Error} If position value is not supported
1674  * @chainable
1675  */
1676 OO.ui.MenuLayout.prototype.setMenuPosition = function ( position ) {
1677         this.$element.removeClass( 'oo-ui-menuLayout-' + this.menuPosition );
1678         this.menuPosition = position;
1679         if ( this.menuPosition === 'top' || this.menuPosition === 'before' ) {
1680                 this.$element.append( this.$menu, this.$content );
1681         } else {
1682                 this.$element.append( this.$content, this.$menu );
1683         }
1684         this.$element.addClass( 'oo-ui-menuLayout-' + position );
1685
1686         return this;
1687 };
1688
1689 /**
1690  * Get menu position.
1691  *
1692  * @return {string} Menu position
1693  */
1694 OO.ui.MenuLayout.prototype.getMenuPosition = function () {
1695         return this.menuPosition;
1696 };
1697
1698 /**
1699  * BookletLayouts contain {@link OO.ui.PageLayout page layouts} as well as
1700  * an {@link OO.ui.OutlineSelectWidget outline} that allows users to easily navigate
1701  * through the pages and select which one to display. By default, only one page is
1702  * displayed at a time and the outline is hidden. When a user navigates to a new page,
1703  * the booklet layout automatically focuses on the first focusable element, unless the
1704  * default setting is changed. Optionally, booklets can be configured to show
1705  * {@link OO.ui.OutlineControlsWidget controls} for adding, moving, and removing items.
1706  *
1707  *     @example
1708  *     // Example of a BookletLayout that contains two PageLayouts.
1709  *
1710  *     function PageOneLayout( name, config ) {
1711  *         PageOneLayout.parent.call( this, name, config );
1712  *         this.$element.append( '<p>First page</p><p>(This booklet has an outline, displayed on the left)</p>' );
1713  *     }
1714  *     OO.inheritClass( PageOneLayout, OO.ui.PageLayout );
1715  *     PageOneLayout.prototype.setupOutlineItem = function () {
1716  *         this.outlineItem.setLabel( 'Page One' );
1717  *     };
1718  *
1719  *     function PageTwoLayout( name, config ) {
1720  *         PageTwoLayout.parent.call( this, name, config );
1721  *         this.$element.append( '<p>Second page</p>' );
1722  *     }
1723  *     OO.inheritClass( PageTwoLayout, OO.ui.PageLayout );
1724  *     PageTwoLayout.prototype.setupOutlineItem = function () {
1725  *         this.outlineItem.setLabel( 'Page Two' );
1726  *     };
1727  *
1728  *     var page1 = new PageOneLayout( 'one' ),
1729  *         page2 = new PageTwoLayout( 'two' );
1730  *
1731  *     var booklet = new OO.ui.BookletLayout( {
1732  *         outlined: true
1733  *     } );
1734  *
1735  *     booklet.addPages ( [ page1, page2 ] );
1736  *     $( 'body' ).append( booklet.$element );
1737  *
1738  * @class
1739  * @extends OO.ui.MenuLayout
1740  *
1741  * @constructor
1742  * @param {Object} [config] Configuration options
1743  * @cfg {boolean} [continuous=false] Show all pages, one after another
1744  * @cfg {boolean} [autoFocus=true] Focus on the first focusable element when a new page is displayed. Disabled on mobile.
1745  * @cfg {boolean} [outlined=false] Show the outline. The outline is used to navigate through the pages of the booklet.
1746  * @cfg {boolean} [editable=false] Show controls for adding, removing and reordering pages
1747  */
1748 OO.ui.BookletLayout = function OoUiBookletLayout( config ) {
1749         // Configuration initialization
1750         config = config || {};
1751
1752         // Parent constructor
1753         OO.ui.BookletLayout.parent.call( this, config );
1754
1755         // Properties
1756         this.currentPageName = null;
1757         this.pages = {};
1758         this.ignoreFocus = false;
1759         this.stackLayout = new OO.ui.StackLayout( {
1760                 continuous: !!config.continuous,
1761                 expanded: this.expanded
1762         } );
1763         this.$content.append( this.stackLayout.$element );
1764         this.autoFocus = config.autoFocus === undefined || !!config.autoFocus;
1765         this.outlineVisible = false;
1766         this.outlined = !!config.outlined;
1767         if ( this.outlined ) {
1768                 this.editable = !!config.editable;
1769                 this.outlineControlsWidget = null;
1770                 this.outlineSelectWidget = new OO.ui.OutlineSelectWidget();
1771                 this.outlinePanel = new OO.ui.PanelLayout( {
1772                         expanded: this.expanded,
1773                         scrollable: true
1774                 } );
1775                 this.$menu.append( this.outlinePanel.$element );
1776                 this.outlineVisible = true;
1777                 if ( this.editable ) {
1778                         this.outlineControlsWidget = new OO.ui.OutlineControlsWidget(
1779                                 this.outlineSelectWidget
1780                         );
1781                 }
1782         }
1783         this.toggleMenu( this.outlined );
1784
1785         // Events
1786         this.stackLayout.connect( this, { set: 'onStackLayoutSet' } );
1787         if ( this.outlined ) {
1788                 this.outlineSelectWidget.connect( this, { select: 'onOutlineSelectWidgetSelect' } );
1789                 this.scrolling = false;
1790                 this.stackLayout.connect( this, { visibleItemChange: 'onStackLayoutVisibleItemChange' } );
1791         }
1792         if ( this.autoFocus ) {
1793                 // Event 'focus' does not bubble, but 'focusin' does
1794                 this.stackLayout.$element.on( 'focusin', this.onStackLayoutFocus.bind( this ) );
1795         }
1796
1797         // Initialization
1798         this.$element.addClass( 'oo-ui-bookletLayout' );
1799         this.stackLayout.$element.addClass( 'oo-ui-bookletLayout-stackLayout' );
1800         if ( this.outlined ) {
1801                 this.outlinePanel.$element
1802                         .addClass( 'oo-ui-bookletLayout-outlinePanel' )
1803                         .append( this.outlineSelectWidget.$element );
1804                 if ( this.editable ) {
1805                         this.outlinePanel.$element
1806                                 .addClass( 'oo-ui-bookletLayout-outlinePanel-editable' )
1807                                 .append( this.outlineControlsWidget.$element );
1808                 }
1809         }
1810 };
1811
1812 /* Setup */
1813
1814 OO.inheritClass( OO.ui.BookletLayout, OO.ui.MenuLayout );
1815
1816 /* Events */
1817
1818 /**
1819  * A 'set' event is emitted when a page is {@link #setPage set} to be displayed by the booklet layout.
1820  * @event set
1821  * @param {OO.ui.PageLayout} page Current page
1822  */
1823
1824 /**
1825  * An 'add' event is emitted when pages are {@link #addPages added} to the booklet layout.
1826  *
1827  * @event add
1828  * @param {OO.ui.PageLayout[]} page Added pages
1829  * @param {number} index Index pages were added at
1830  */
1831
1832 /**
1833  * A 'remove' event is emitted when pages are {@link #clearPages cleared} or
1834  * {@link #removePages removed} from the booklet.
1835  *
1836  * @event remove
1837  * @param {OO.ui.PageLayout[]} pages Removed pages
1838  */
1839
1840 /* Methods */
1841
1842 /**
1843  * Handle stack layout focus.
1844  *
1845  * @private
1846  * @param {jQuery.Event} e Focusin event
1847  */
1848 OO.ui.BookletLayout.prototype.onStackLayoutFocus = function ( e ) {
1849         var name, $target;
1850
1851         // Find the page that an element was focused within
1852         $target = $( e.target ).closest( '.oo-ui-pageLayout' );
1853         for ( name in this.pages ) {
1854                 // Check for page match, exclude current page to find only page changes
1855                 if ( this.pages[ name ].$element[ 0 ] === $target[ 0 ] && name !== this.currentPageName ) {
1856                         this.setPage( name );
1857                         break;
1858                 }
1859         }
1860 };
1861
1862 /**
1863  * Handle visibleItemChange events from the stackLayout
1864  *
1865  * The next visible page is set as the current page by selecting it
1866  * in the outline
1867  *
1868  * @param {OO.ui.PageLayout} page The next visible page in the layout
1869  */
1870 OO.ui.BookletLayout.prototype.onStackLayoutVisibleItemChange = function ( page ) {
1871         // Set a flag to so that the resulting call to #onStackLayoutSet doesn't
1872         // try and scroll the item into view again.
1873         this.scrolling = true;
1874         this.outlineSelectWidget.selectItemByData( page.getName() );
1875         this.scrolling = false;
1876 };
1877
1878 /**
1879  * Handle stack layout set events.
1880  *
1881  * @private
1882  * @param {OO.ui.PanelLayout|null} page The page panel that is now the current panel
1883  */
1884 OO.ui.BookletLayout.prototype.onStackLayoutSet = function ( page ) {
1885         var promise, layout = this;
1886         // If everything is unselected, do nothing
1887         if ( !page ) {
1888                 return;
1889         }
1890         // For continuous BookletLayouts, scroll the selected page into view first
1891         if ( this.stackLayout.continuous && !this.scrolling ) {
1892                 promise = page.scrollElementIntoView();
1893         } else {
1894                 promise = $.Deferred().resolve();
1895         }
1896         // Focus the first element on the newly selected panel
1897         if ( this.autoFocus && !OO.ui.isMobile() ) {
1898                 promise.done( function () {
1899                         layout.focus();
1900                 } );
1901         }
1902 };
1903
1904 /**
1905  * Focus the first input in the current page.
1906  *
1907  * If no page is selected, the first selectable page will be selected.
1908  * If the focus is already in an element on the current page, nothing will happen.
1909  *
1910  * @param {number} [itemIndex] A specific item to focus on
1911  */
1912 OO.ui.BookletLayout.prototype.focus = function ( itemIndex ) {
1913         var page,
1914                 items = this.stackLayout.getItems();
1915
1916         if ( itemIndex !== undefined && items[ itemIndex ] ) {
1917                 page = items[ itemIndex ];
1918         } else {
1919                 page = this.stackLayout.getCurrentItem();
1920         }
1921
1922         if ( !page && this.outlined ) {
1923                 this.selectFirstSelectablePage();
1924                 page = this.stackLayout.getCurrentItem();
1925         }
1926         if ( !page ) {
1927                 return;
1928         }
1929         // Only change the focus if is not already in the current page
1930         if ( !OO.ui.contains( page.$element[ 0 ], this.getElementDocument().activeElement, true ) ) {
1931                 page.focus();
1932         }
1933 };
1934
1935 /**
1936  * Find the first focusable input in the booklet layout and focus
1937  * on it.
1938  */
1939 OO.ui.BookletLayout.prototype.focusFirstFocusable = function () {
1940         OO.ui.findFocusable( this.stackLayout.$element ).focus();
1941 };
1942
1943 /**
1944  * Handle outline widget select events.
1945  *
1946  * @private
1947  * @param {OO.ui.OptionWidget|null} item Selected item
1948  */
1949 OO.ui.BookletLayout.prototype.onOutlineSelectWidgetSelect = function ( item ) {
1950         if ( item ) {
1951                 this.setPage( item.getData() );
1952         }
1953 };
1954
1955 /**
1956  * Check if booklet has an outline.
1957  *
1958  * @return {boolean} Booklet has an outline
1959  */
1960 OO.ui.BookletLayout.prototype.isOutlined = function () {
1961         return this.outlined;
1962 };
1963
1964 /**
1965  * Check if booklet has editing controls.
1966  *
1967  * @return {boolean} Booklet is editable
1968  */
1969 OO.ui.BookletLayout.prototype.isEditable = function () {
1970         return this.editable;
1971 };
1972
1973 /**
1974  * Check if booklet has a visible outline.
1975  *
1976  * @return {boolean} Outline is visible
1977  */
1978 OO.ui.BookletLayout.prototype.isOutlineVisible = function () {
1979         return this.outlined && this.outlineVisible;
1980 };
1981
1982 /**
1983  * Hide or show the outline.
1984  *
1985  * @param {boolean} [show] Show outline, omit to invert current state
1986  * @chainable
1987  */
1988 OO.ui.BookletLayout.prototype.toggleOutline = function ( show ) {
1989         var booklet = this;
1990
1991         if ( this.outlined ) {
1992                 show = show === undefined ? !this.outlineVisible : !!show;
1993                 this.outlineVisible = show;
1994                 this.toggleMenu( show );
1995                 if ( show && this.editable ) {
1996                         // HACK: Kill dumb scrollbars when the sidebar stops animating, see T161798. Only necessary when
1997                         // outline controls are present, delay matches transition on `.oo-ui-menuLayout-menu`.
1998                         setTimeout( function () {
1999                                 OO.ui.Element.static.reconsiderScrollbars( booklet.outlinePanel.$element[ 0 ] );
2000                         }, 200 );
2001                 }
2002         }
2003
2004         return this;
2005 };
2006
2007 /**
2008  * Find the page closest to the specified page.
2009  *
2010  * @param {OO.ui.PageLayout} page Page to use as a reference point
2011  * @return {OO.ui.PageLayout|null} Page closest to the specified page
2012  */
2013 OO.ui.BookletLayout.prototype.findClosestPage = function ( page ) {
2014         var next, prev, level,
2015                 pages = this.stackLayout.getItems(),
2016                 index = pages.indexOf( page );
2017
2018         if ( index !== -1 ) {
2019                 next = pages[ index + 1 ];
2020                 prev = pages[ index - 1 ];
2021                 // Prefer adjacent pages at the same level
2022                 if ( this.outlined ) {
2023                         level = this.outlineSelectWidget.findItemFromData( page.getName() ).getLevel();
2024                         if (
2025                                 prev &&
2026                                 level === this.outlineSelectWidget.findItemFromData( prev.getName() ).getLevel()
2027                         ) {
2028                                 return prev;
2029                         }
2030                         if (
2031                                 next &&
2032                                 level === this.outlineSelectWidget.findItemFromData( next.getName() ).getLevel()
2033                         ) {
2034                                 return next;
2035                         }
2036                 }
2037         }
2038         return prev || next || null;
2039 };
2040
2041 /**
2042  * Get the outline widget.
2043  *
2044  * If the booklet is not outlined, the method will return `null`.
2045  *
2046  * @return {OO.ui.OutlineSelectWidget|null} Outline widget, or null if the booklet is not outlined
2047  */
2048 OO.ui.BookletLayout.prototype.getOutline = function () {
2049         return this.outlineSelectWidget;
2050 };
2051
2052 /**
2053  * Get the outline controls widget.
2054  *
2055  * If the outline is not editable, the method will return `null`.
2056  *
2057  * @return {OO.ui.OutlineControlsWidget|null} The outline controls widget.
2058  */
2059 OO.ui.BookletLayout.prototype.getOutlineControls = function () {
2060         return this.outlineControlsWidget;
2061 };
2062
2063 /**
2064  * Get a page by its symbolic name.
2065  *
2066  * @param {string} name Symbolic name of page
2067  * @return {OO.ui.PageLayout|undefined} Page, if found
2068  */
2069 OO.ui.BookletLayout.prototype.getPage = function ( name ) {
2070         return this.pages[ name ];
2071 };
2072
2073 /**
2074  * Get the current page.
2075  *
2076  * @return {OO.ui.PageLayout|undefined} Current page, if found
2077  */
2078 OO.ui.BookletLayout.prototype.getCurrentPage = function () {
2079         var name = this.getCurrentPageName();
2080         return name ? this.getPage( name ) : undefined;
2081 };
2082
2083 /**
2084  * Get the symbolic name of the current page.
2085  *
2086  * @return {string|null} Symbolic name of the current page
2087  */
2088 OO.ui.BookletLayout.prototype.getCurrentPageName = function () {
2089         return this.currentPageName;
2090 };
2091
2092 /**
2093  * Add pages to the booklet layout
2094  *
2095  * When pages are added with the same names as existing pages, the existing pages will be
2096  * automatically removed before the new pages are added.
2097  *
2098  * @param {OO.ui.PageLayout[]} pages Pages to add
2099  * @param {number} index Index of the insertion point
2100  * @fires add
2101  * @chainable
2102  */
2103 OO.ui.BookletLayout.prototype.addPages = function ( pages, index ) {
2104         var i, len, name, page, item, currentIndex,
2105                 stackLayoutPages = this.stackLayout.getItems(),
2106                 remove = [],
2107                 items = [];
2108
2109         // Remove pages with same names
2110         for ( i = 0, len = pages.length; i < len; i++ ) {
2111                 page = pages[ i ];
2112                 name = page.getName();
2113
2114                 if ( Object.prototype.hasOwnProperty.call( this.pages, name ) ) {
2115                         // Correct the insertion index
2116                         currentIndex = stackLayoutPages.indexOf( this.pages[ name ] );
2117                         if ( currentIndex !== -1 && currentIndex + 1 < index ) {
2118                                 index--;
2119                         }
2120                         remove.push( this.pages[ name ] );
2121                 }
2122         }
2123         if ( remove.length ) {
2124                 this.removePages( remove );
2125         }
2126
2127         // Add new pages
2128         for ( i = 0, len = pages.length; i < len; i++ ) {
2129                 page = pages[ i ];
2130                 name = page.getName();
2131                 this.pages[ page.getName() ] = page;
2132                 if ( this.outlined ) {
2133                         item = new OO.ui.OutlineOptionWidget( { data: name } );
2134                         page.setOutlineItem( item );
2135                         items.push( item );
2136                 }
2137         }
2138
2139         if ( this.outlined && items.length ) {
2140                 this.outlineSelectWidget.addItems( items, index );
2141                 this.selectFirstSelectablePage();
2142         }
2143         this.stackLayout.addItems( pages, index );
2144         this.emit( 'add', pages, index );
2145
2146         return this;
2147 };
2148
2149 /**
2150  * Remove the specified pages from the booklet layout.
2151  *
2152  * To remove all pages from the booklet, you may wish to use the #clearPages method instead.
2153  *
2154  * @param {OO.ui.PageLayout[]} pages An array of pages to remove
2155  * @fires remove
2156  * @chainable
2157  */
2158 OO.ui.BookletLayout.prototype.removePages = function ( pages ) {
2159         var i, len, name, page,
2160                 items = [];
2161
2162         for ( i = 0, len = pages.length; i < len; i++ ) {
2163                 page = pages[ i ];
2164                 name = page.getName();
2165                 delete this.pages[ name ];
2166                 if ( this.outlined ) {
2167                         items.push( this.outlineSelectWidget.findItemFromData( name ) );
2168                         page.setOutlineItem( null );
2169                 }
2170         }
2171         if ( this.outlined && items.length ) {
2172                 this.outlineSelectWidget.removeItems( items );
2173                 this.selectFirstSelectablePage();
2174         }
2175         this.stackLayout.removeItems( pages );
2176         this.emit( 'remove', pages );
2177
2178         return this;
2179 };
2180
2181 /**
2182  * Clear all pages from the booklet layout.
2183  *
2184  * To remove only a subset of pages from the booklet, use the #removePages method.
2185  *
2186  * @fires remove
2187  * @chainable
2188  */
2189 OO.ui.BookletLayout.prototype.clearPages = function () {
2190         var i, len,
2191                 pages = this.stackLayout.getItems();
2192
2193         this.pages = {};
2194         this.currentPageName = null;
2195         if ( this.outlined ) {
2196                 this.outlineSelectWidget.clearItems();
2197                 for ( i = 0, len = pages.length; i < len; i++ ) {
2198                         pages[ i ].setOutlineItem( null );
2199                 }
2200         }
2201         this.stackLayout.clearItems();
2202
2203         this.emit( 'remove', pages );
2204
2205         return this;
2206 };
2207
2208 /**
2209  * Set the current page by symbolic name.
2210  *
2211  * @fires set
2212  * @param {string} name Symbolic name of page
2213  */
2214 OO.ui.BookletLayout.prototype.setPage = function ( name ) {
2215         var selectedItem,
2216                 $focused,
2217                 page = this.pages[ name ],
2218                 previousPage = this.currentPageName && this.pages[ this.currentPageName ];
2219
2220         if ( name !== this.currentPageName ) {
2221                 if ( this.outlined ) {
2222                         selectedItem = this.outlineSelectWidget.findSelectedItem();
2223                         if ( selectedItem && selectedItem.getData() !== name ) {
2224                                 this.outlineSelectWidget.selectItemByData( name );
2225                         }
2226                 }
2227                 if ( page ) {
2228                         if ( previousPage ) {
2229                                 previousPage.setActive( false );
2230                                 // Blur anything focused if the next page doesn't have anything focusable.
2231                                 // This is not needed if the next page has something focusable (because once it is focused
2232                                 // this blur happens automatically). If the layout is non-continuous, this check is
2233                                 // meaningless because the next page is not visible yet and thus can't hold focus.
2234                                 if (
2235                                         this.autoFocus &&
2236                                         !OO.ui.isMobile() &&
2237                                         this.stackLayout.continuous &&
2238                                         OO.ui.findFocusable( page.$element ).length !== 0
2239                                 ) {
2240                                         $focused = previousPage.$element.find( ':focus' );
2241                                         if ( $focused.length ) {
2242                                                 $focused[ 0 ].blur();
2243                                         }
2244                                 }
2245                         }
2246                         this.currentPageName = name;
2247                         page.setActive( true );
2248                         this.stackLayout.setItem( page );
2249                         if ( !this.stackLayout.continuous && previousPage ) {
2250                                 // This should not be necessary, since any inputs on the previous page should have been
2251                                 // blurred when it was hidden, but browsers are not very consistent about this.
2252                                 $focused = previousPage.$element.find( ':focus' );
2253                                 if ( $focused.length ) {
2254                                         $focused[ 0 ].blur();
2255                                 }
2256                         }
2257                         this.emit( 'set', page );
2258                 }
2259         }
2260 };
2261
2262 /**
2263  * Select the first selectable page.
2264  *
2265  * @chainable
2266  */
2267 OO.ui.BookletLayout.prototype.selectFirstSelectablePage = function () {
2268         if ( !this.outlineSelectWidget.findSelectedItem() ) {
2269                 this.outlineSelectWidget.selectItem( this.outlineSelectWidget.findFirstSelectableItem() );
2270         }
2271
2272         return this;
2273 };
2274
2275 /**
2276  * IndexLayouts contain {@link OO.ui.TabPanelLayout tab panel layouts} as well as
2277  * {@link OO.ui.TabSelectWidget tabs} that allow users to easily navigate through the tab panels and
2278  * select which one to display. By default, only one tab panel is displayed at a time. When a user
2279  * navigates to a new tab panel, the index layout automatically focuses on the first focusable element,
2280  * unless the default setting is changed.
2281  *
2282  * TODO: This class is similar to BookletLayout, we may want to refactor to reduce duplication
2283  *
2284  *     @example
2285  *     // Example of a IndexLayout that contains two TabPanelLayouts.
2286  *
2287  *     function TabPanelOneLayout( name, config ) {
2288  *         TabPanelOneLayout.parent.call( this, name, config );
2289  *         this.$element.append( '<p>First tab panel</p>' );
2290  *     }
2291  *     OO.inheritClass( TabPanelOneLayout, OO.ui.TabPanelLayout );
2292  *     TabPanelOneLayout.prototype.setupTabItem = function () {
2293  *         this.tabItem.setLabel( 'Tab panel one' );
2294  *     };
2295  *
2296  *     var tabPanel1 = new TabPanelOneLayout( 'one' ),
2297  *         tabPanel2 = new OO.ui.TabPanelLayout( 'two', { label: 'Tab panel two' } );
2298  *
2299  *     tabPanel2.$element.append( '<p>Second tab panel</p>' );
2300  *
2301  *     var index = new OO.ui.IndexLayout();
2302  *
2303  *     index.addTabPanels ( [ tabPanel1, tabPanel2 ] );
2304  *     $( 'body' ).append( index.$element );
2305  *
2306  * @class
2307  * @extends OO.ui.MenuLayout
2308  *
2309  * @constructor
2310  * @param {Object} [config] Configuration options
2311  * @cfg {boolean} [continuous=false] Show all tab panels, one after another
2312  * @cfg {boolean} [autoFocus=true] Focus on the first focusable element when a new tab panel is displayed. Disabled on mobile.
2313  */
2314 OO.ui.IndexLayout = function OoUiIndexLayout( config ) {
2315         // Configuration initialization
2316         config = $.extend( {}, config, { menuPosition: 'top' } );
2317
2318         // Parent constructor
2319         OO.ui.IndexLayout.parent.call( this, config );
2320
2321         // Properties
2322         this.currentTabPanelName = null;
2323         this.tabPanels = {};
2324
2325         this.ignoreFocus = false;
2326         this.stackLayout = new OO.ui.StackLayout( {
2327                 continuous: !!config.continuous,
2328                 expanded: this.expanded
2329         } );
2330         this.$content.append( this.stackLayout.$element );
2331         this.autoFocus = config.autoFocus === undefined || !!config.autoFocus;
2332
2333         this.tabSelectWidget = new OO.ui.TabSelectWidget();
2334         this.tabPanel = new OO.ui.PanelLayout( {
2335                 expanded: this.expanded
2336         } );
2337         this.$menu.append( this.tabPanel.$element );
2338
2339         this.toggleMenu( true );
2340
2341         // Events
2342         this.stackLayout.connect( this, { set: 'onStackLayoutSet' } );
2343         this.tabSelectWidget.connect( this, { select: 'onTabSelectWidgetSelect' } );
2344         if ( this.autoFocus ) {
2345                 // Event 'focus' does not bubble, but 'focusin' does
2346                 this.stackLayout.$element.on( 'focusin', this.onStackLayoutFocus.bind( this ) );
2347         }
2348
2349         // Initialization
2350         this.$element.addClass( 'oo-ui-indexLayout' );
2351         this.stackLayout.$element.addClass( 'oo-ui-indexLayout-stackLayout' );
2352         this.tabPanel.$element
2353                 .addClass( 'oo-ui-indexLayout-tabPanel' )
2354                 .append( this.tabSelectWidget.$element );
2355 };
2356
2357 /* Setup */
2358
2359 OO.inheritClass( OO.ui.IndexLayout, OO.ui.MenuLayout );
2360
2361 /* Events */
2362
2363 /**
2364  * A 'set' event is emitted when a tab panel is {@link #setTabPanel set} to be displayed by the index layout.
2365  * @event set
2366  * @param {OO.ui.TabPanelLayout} tabPanel Current tab panel
2367  */
2368
2369 /**
2370  * An 'add' event is emitted when tab panels are {@link #addTabPanels added} to the index layout.
2371  *
2372  * @event add
2373  * @param {OO.ui.TabPanelLayout[]} tabPanel Added tab panels
2374  * @param {number} index Index tab panels were added at
2375  */
2376
2377 /**
2378  * A 'remove' event is emitted when tab panels are {@link #clearTabPanels cleared} or
2379  * {@link #removeTabPanels removed} from the index.
2380  *
2381  * @event remove
2382  * @param {OO.ui.TabPanelLayout[]} tabPanel Removed tab panels
2383  */
2384
2385 /* Methods */
2386
2387 /**
2388  * Handle stack layout focus.
2389  *
2390  * @private
2391  * @param {jQuery.Event} e Focusing event
2392  */
2393 OO.ui.IndexLayout.prototype.onStackLayoutFocus = function ( e ) {
2394         var name, $target;
2395
2396         // Find the tab panel that an element was focused within
2397         $target = $( e.target ).closest( '.oo-ui-tabPanelLayout' );
2398         for ( name in this.tabPanels ) {
2399                 // Check for tab panel match, exclude current tab panel to find only tab panel changes
2400                 if ( this.tabPanels[ name ].$element[ 0 ] === $target[ 0 ] && name !== this.currentTabPanelName ) {
2401                         this.setTabPanel( name );
2402                         break;
2403                 }
2404         }
2405 };
2406
2407 /**
2408  * Handle stack layout set events.
2409  *
2410  * @private
2411  * @param {OO.ui.PanelLayout|null} tabPanel The tab panel that is now the current panel
2412  */
2413 OO.ui.IndexLayout.prototype.onStackLayoutSet = function ( tabPanel ) {
2414         // If everything is unselected, do nothing
2415         if ( !tabPanel ) {
2416                 return;
2417         }
2418         // Focus the first element on the newly selected panel
2419         if ( this.autoFocus && !OO.ui.isMobile() ) {
2420                 this.focus();
2421         }
2422 };
2423
2424 /**
2425  * Focus the first input in the current tab panel.
2426  *
2427  * If no tab panel is selected, the first selectable tab panel will be selected.
2428  * If the focus is already in an element on the current tab panel, nothing will happen.
2429  *
2430  * @param {number} [itemIndex] A specific item to focus on
2431  */
2432 OO.ui.IndexLayout.prototype.focus = function ( itemIndex ) {
2433         var tabPanel,
2434                 items = this.stackLayout.getItems();
2435
2436         if ( itemIndex !== undefined && items[ itemIndex ] ) {
2437                 tabPanel = items[ itemIndex ];
2438         } else {
2439                 tabPanel = this.stackLayout.getCurrentItem();
2440         }
2441
2442         if ( !tabPanel ) {
2443                 this.selectFirstSelectableTabPanel();
2444                 tabPanel = this.stackLayout.getCurrentItem();
2445         }
2446         if ( !tabPanel ) {
2447                 return;
2448         }
2449         // Only change the focus if is not already in the current page
2450         if ( !OO.ui.contains( tabPanel.$element[ 0 ], this.getElementDocument().activeElement, true ) ) {
2451                 tabPanel.focus();
2452         }
2453 };
2454
2455 /**
2456  * Find the first focusable input in the index layout and focus
2457  * on it.
2458  */
2459 OO.ui.IndexLayout.prototype.focusFirstFocusable = function () {
2460         OO.ui.findFocusable( this.stackLayout.$element ).focus();
2461 };
2462
2463 /**
2464  * Handle tab widget select events.
2465  *
2466  * @private
2467  * @param {OO.ui.OptionWidget|null} item Selected item
2468  */
2469 OO.ui.IndexLayout.prototype.onTabSelectWidgetSelect = function ( item ) {
2470         if ( item ) {
2471                 this.setTabPanel( item.getData() );
2472         }
2473 };
2474
2475 /**
2476  * Get the tab panel closest to the specified tab panel.
2477  *
2478  * @param {OO.ui.TabPanelLayout} tabPanel Tab panel to use as a reference point
2479  * @return {OO.ui.TabPanelLayout|null} Tab panel closest to the specified
2480  */
2481 OO.ui.IndexLayout.prototype.getClosestTabPanel = function ( tabPanel ) {
2482         var next, prev, level,
2483                 tabPanels = this.stackLayout.getItems(),
2484                 index = tabPanels.indexOf( tabPanel );
2485
2486         if ( index !== -1 ) {
2487                 next = tabPanels[ index + 1 ];
2488                 prev = tabPanels[ index - 1 ];
2489                 // Prefer adjacent tab panels at the same level
2490                 level = this.tabSelectWidget.findItemFromData( tabPanel.getName() ).getLevel();
2491                 if (
2492                         prev &&
2493                         level === this.tabSelectWidget.findItemFromData( prev.getName() ).getLevel()
2494                 ) {
2495                         return prev;
2496                 }
2497                 if (
2498                         next &&
2499                         level === this.tabSelectWidget.findItemFromData( next.getName() ).getLevel()
2500                 ) {
2501                         return next;
2502                 }
2503         }
2504         return prev || next || null;
2505 };
2506
2507 /**
2508  * Get the tabs widget.
2509  *
2510  * @return {OO.ui.TabSelectWidget} Tabs widget
2511  */
2512 OO.ui.IndexLayout.prototype.getTabs = function () {
2513         return this.tabSelectWidget;
2514 };
2515
2516 /**
2517  * Get a tab panel by its symbolic name.
2518  *
2519  * @param {string} name Symbolic name of tab panel
2520  * @return {OO.ui.TabPanelLayout|undefined} Tab panel, if found
2521  */
2522 OO.ui.IndexLayout.prototype.getTabPanel = function ( name ) {
2523         return this.tabPanels[ name ];
2524 };
2525
2526 /**
2527  * Get the current tab panel.
2528  *
2529  * @return {OO.ui.TabPanelLayout|undefined} Current tab panel, if found
2530  */
2531 OO.ui.IndexLayout.prototype.getCurrentTabPanel = function () {
2532         var name = this.getCurrentTabPanelName();
2533         return name ? this.getTabPanel( name ) : undefined;
2534 };
2535
2536 /**
2537  * Get the symbolic name of the current tab panel.
2538  *
2539  * @return {string|null} Symbolic name of the current tab panel
2540  */
2541 OO.ui.IndexLayout.prototype.getCurrentTabPanelName = function () {
2542         return this.currentTabPanelName;
2543 };
2544
2545 /**
2546  * Add tab panels to the index layout
2547  *
2548  * When tab panels are added with the same names as existing tab panels, the existing tab panels
2549  * will be automatically removed before the new tab panels are added.
2550  *
2551  * @param {OO.ui.TabPanelLayout[]} tabPanels Tab panels to add
2552  * @param {number} index Index of the insertion point
2553  * @fires add
2554  * @chainable
2555  */
2556 OO.ui.IndexLayout.prototype.addTabPanels = function ( tabPanels, index ) {
2557         var i, len, name, tabPanel, item, currentIndex,
2558                 stackLayoutTabPanels = this.stackLayout.getItems(),
2559                 remove = [],
2560                 items = [];
2561
2562         // Remove tab panels with same names
2563         for ( i = 0, len = tabPanels.length; i < len; i++ ) {
2564                 tabPanel = tabPanels[ i ];
2565                 name = tabPanel.getName();
2566
2567                 if ( Object.prototype.hasOwnProperty.call( this.tabPanels, name ) ) {
2568                         // Correct the insertion index
2569                         currentIndex = stackLayoutTabPanels.indexOf( this.tabPanels[ name ] );
2570                         if ( currentIndex !== -1 && currentIndex + 1 < index ) {
2571                                 index--;
2572                         }
2573                         remove.push( this.tabPanels[ name ] );
2574                 }
2575         }
2576         if ( remove.length ) {
2577                 this.removeTabPanels( remove );
2578         }
2579
2580         // Add new tab panels
2581         for ( i = 0, len = tabPanels.length; i < len; i++ ) {
2582                 tabPanel = tabPanels[ i ];
2583                 name = tabPanel.getName();
2584                 this.tabPanels[ tabPanel.getName() ] = tabPanel;
2585                 item = new OO.ui.TabOptionWidget( { data: name } );
2586                 tabPanel.setTabItem( item );
2587                 items.push( item );
2588         }
2589
2590         if ( items.length ) {
2591                 this.tabSelectWidget.addItems( items, index );
2592                 this.selectFirstSelectableTabPanel();
2593         }
2594         this.stackLayout.addItems( tabPanels, index );
2595         this.emit( 'add', tabPanels, index );
2596
2597         return this;
2598 };
2599
2600 /**
2601  * Remove the specified tab panels from the index layout.
2602  *
2603  * To remove all tab panels from the index, you may wish to use the #clearTabPanels method instead.
2604  *
2605  * @param {OO.ui.TabPanelLayout[]} tabPanels An array of tab panels to remove
2606  * @fires remove
2607  * @chainable
2608  */
2609 OO.ui.IndexLayout.prototype.removeTabPanels = function ( tabPanels ) {
2610         var i, len, name, tabPanel,
2611                 items = [];
2612
2613         for ( i = 0, len = tabPanels.length; i < len; i++ ) {
2614                 tabPanel = tabPanels[ i ];
2615                 name = tabPanel.getName();
2616                 delete this.tabPanels[ name ];
2617                 items.push( this.tabSelectWidget.findItemFromData( name ) );
2618                 tabPanel.setTabItem( null );
2619         }
2620         if ( items.length ) {
2621                 this.tabSelectWidget.removeItems( items );
2622                 this.selectFirstSelectableTabPanel();
2623         }
2624         this.stackLayout.removeItems( tabPanels );
2625         this.emit( 'remove', tabPanels );
2626
2627         return this;
2628 };
2629
2630 /**
2631  * Clear all tab panels from the index layout.
2632  *
2633  * To remove only a subset of tab panels from the index, use the #removeTabPanels method.
2634  *
2635  * @fires remove
2636  * @chainable
2637  */
2638 OO.ui.IndexLayout.prototype.clearTabPanels = function () {
2639         var i, len,
2640                 tabPanels = this.stackLayout.getItems();
2641
2642         this.tabPanels = {};
2643         this.currentTabPanelName = null;
2644         this.tabSelectWidget.clearItems();
2645         for ( i = 0, len = tabPanels.length; i < len; i++ ) {
2646                 tabPanels[ i ].setTabItem( null );
2647         }
2648         this.stackLayout.clearItems();
2649
2650         this.emit( 'remove', tabPanels );
2651
2652         return this;
2653 };
2654
2655 /**
2656  * Set the current tab panel by symbolic name.
2657  *
2658  * @fires set
2659  * @param {string} name Symbolic name of tab panel
2660  */
2661 OO.ui.IndexLayout.prototype.setTabPanel = function ( name ) {
2662         var selectedItem,
2663                 $focused,
2664                 tabPanel = this.tabPanels[ name ],
2665                 previousTabPanel = this.currentTabPanelName && this.tabPanels[ this.currentTabPanelName ];
2666
2667         if ( name !== this.currentTabPanelName ) {
2668                 selectedItem = this.tabSelectWidget.findSelectedItem();
2669                 if ( selectedItem && selectedItem.getData() !== name ) {
2670                         this.tabSelectWidget.selectItemByData( name );
2671                 }
2672                 if ( tabPanel ) {
2673                         if ( previousTabPanel ) {
2674                                 previousTabPanel.setActive( false );
2675                                 // Blur anything focused if the next tab panel doesn't have anything focusable.
2676                                 // This is not needed if the next tab panel has something focusable (because once it is focused
2677                                 // this blur happens automatically). If the layout is non-continuous, this check is
2678                                 // meaningless because the next tab panel is not visible yet and thus can't hold focus.
2679                                 if (
2680                                         this.autoFocus &&
2681                                         !OO.ui.isMobile() &&
2682                                         this.stackLayout.continuous &&
2683                                         OO.ui.findFocusable( tabPanel.$element ).length !== 0
2684                                 ) {
2685                                         $focused = previousTabPanel.$element.find( ':focus' );
2686                                         if ( $focused.length ) {
2687                                                 $focused[ 0 ].blur();
2688                                         }
2689                                 }
2690                         }
2691                         this.currentTabPanelName = name;
2692                         tabPanel.setActive( true );
2693                         this.stackLayout.setItem( tabPanel );
2694                         if ( !this.stackLayout.continuous && previousTabPanel ) {
2695                                 // This should not be necessary, since any inputs on the previous tab panel should have been
2696                                 // blurred when it was hidden, but browsers are not very consistent about this.
2697                                 $focused = previousTabPanel.$element.find( ':focus' );
2698                                 if ( $focused.length ) {
2699                                         $focused[ 0 ].blur();
2700                                 }
2701                         }
2702                         this.emit( 'set', tabPanel );
2703                 }
2704         }
2705 };
2706
2707 /**
2708  * Select the first selectable tab panel.
2709  *
2710  * @chainable
2711  */
2712 OO.ui.IndexLayout.prototype.selectFirstSelectableTabPanel = function () {
2713         if ( !this.tabSelectWidget.findSelectedItem() ) {
2714                 this.tabSelectWidget.selectItem( this.tabSelectWidget.findFirstSelectableItem() );
2715         }
2716
2717         return this;
2718 };
2719
2720 /**
2721  * ToggleWidget implements basic behavior of widgets with an on/off state.
2722  * Please see OO.ui.ToggleButtonWidget and OO.ui.ToggleSwitchWidget for examples.
2723  *
2724  * @abstract
2725  * @class
2726  * @extends OO.ui.Widget
2727  *
2728  * @constructor
2729  * @param {Object} [config] Configuration options
2730  * @cfg {boolean} [value=false] The toggle’s initial on/off state.
2731  *  By default, the toggle is in the 'off' state.
2732  */
2733 OO.ui.ToggleWidget = function OoUiToggleWidget( config ) {
2734         // Configuration initialization
2735         config = config || {};
2736
2737         // Parent constructor
2738         OO.ui.ToggleWidget.parent.call( this, config );
2739
2740         // Properties
2741         this.value = null;
2742
2743         // Initialization
2744         this.$element.addClass( 'oo-ui-toggleWidget' );
2745         this.setValue( !!config.value );
2746 };
2747
2748 /* Setup */
2749
2750 OO.inheritClass( OO.ui.ToggleWidget, OO.ui.Widget );
2751
2752 /* Events */
2753
2754 /**
2755  * @event change
2756  *
2757  * A change event is emitted when the on/off state of the toggle changes.
2758  *
2759  * @param {boolean} value Value representing the new state of the toggle
2760  */
2761
2762 /* Methods */
2763
2764 /**
2765  * Get the value representing the toggle’s state.
2766  *
2767  * @return {boolean} The on/off state of the toggle
2768  */
2769 OO.ui.ToggleWidget.prototype.getValue = function () {
2770         return this.value;
2771 };
2772
2773 /**
2774  * Set the state of the toggle: `true` for 'on', `false` for 'off'.
2775  *
2776  * @param {boolean} value The state of the toggle
2777  * @fires change
2778  * @chainable
2779  */
2780 OO.ui.ToggleWidget.prototype.setValue = function ( value ) {
2781         value = !!value;
2782         if ( this.value !== value ) {
2783                 this.value = value;
2784                 this.emit( 'change', value );
2785                 this.$element.toggleClass( 'oo-ui-toggleWidget-on', value );
2786                 this.$element.toggleClass( 'oo-ui-toggleWidget-off', !value );
2787         }
2788         return this;
2789 };
2790
2791 /**
2792  * ToggleButtons are buttons that have a state (‘on’ or ‘off’) that is represented by a
2793  * Boolean value. Like other {@link OO.ui.ButtonWidget buttons}, toggle buttons can be
2794  * configured with {@link OO.ui.mixin.IconElement icons}, {@link OO.ui.mixin.IndicatorElement indicators},
2795  * {@link OO.ui.mixin.TitledElement titles}, {@link OO.ui.mixin.FlaggedElement styling flags},
2796  * and {@link OO.ui.mixin.LabelElement labels}. Please see
2797  * the [OOUI documentation][1] on MediaWiki for more information.
2798  *
2799  *     @example
2800  *     // Toggle buttons in the 'off' and 'on' state.
2801  *     var toggleButton1 = new OO.ui.ToggleButtonWidget( {
2802  *         label: 'Toggle Button off'
2803  *     } );
2804  *     var toggleButton2 = new OO.ui.ToggleButtonWidget( {
2805  *         label: 'Toggle Button on',
2806  *         value: true
2807  *     } );
2808  *     // Append the buttons to the DOM.
2809  *     $( 'body' ).append( toggleButton1.$element, toggleButton2.$element );
2810  *
2811  * [1]: https://www.mediawiki.org/wiki/OOUI/Widgets/Buttons_and_Switches#Toggle_buttons
2812  *
2813  * @class
2814  * @extends OO.ui.ToggleWidget
2815  * @mixins OO.ui.mixin.ButtonElement
2816  * @mixins OO.ui.mixin.IconElement
2817  * @mixins OO.ui.mixin.IndicatorElement
2818  * @mixins OO.ui.mixin.LabelElement
2819  * @mixins OO.ui.mixin.TitledElement
2820  * @mixins OO.ui.mixin.FlaggedElement
2821  * @mixins OO.ui.mixin.TabIndexedElement
2822  *
2823  * @constructor
2824  * @param {Object} [config] Configuration options
2825  * @cfg {boolean} [value=false] The toggle button’s initial on/off
2826  *  state. By default, the button is in the 'off' state.
2827  */
2828 OO.ui.ToggleButtonWidget = function OoUiToggleButtonWidget( config ) {
2829         // Configuration initialization
2830         config = config || {};
2831
2832         // Parent constructor
2833         OO.ui.ToggleButtonWidget.parent.call( this, config );
2834
2835         // Mixin constructors
2836         OO.ui.mixin.ButtonElement.call( this, $.extend( {}, config, { active: this.active } ) );
2837         OO.ui.mixin.IconElement.call( this, config );
2838         OO.ui.mixin.IndicatorElement.call( this, config );
2839         OO.ui.mixin.LabelElement.call( this, config );
2840         OO.ui.mixin.TitledElement.call( this, $.extend( {}, config, { $titled: this.$button } ) );
2841         OO.ui.mixin.FlaggedElement.call( this, config );
2842         OO.ui.mixin.TabIndexedElement.call( this, $.extend( {}, config, { $tabIndexed: this.$button } ) );
2843
2844         // Events
2845         this.connect( this, { click: 'onAction' } );
2846
2847         // Initialization
2848         this.$button.append( this.$icon, this.$label, this.$indicator );
2849         this.$element
2850                 .addClass( 'oo-ui-toggleButtonWidget' )
2851                 .append( this.$button );
2852 };
2853
2854 /* Setup */
2855
2856 OO.inheritClass( OO.ui.ToggleButtonWidget, OO.ui.ToggleWidget );
2857 OO.mixinClass( OO.ui.ToggleButtonWidget, OO.ui.mixin.ButtonElement );
2858 OO.mixinClass( OO.ui.ToggleButtonWidget, OO.ui.mixin.IconElement );
2859 OO.mixinClass( OO.ui.ToggleButtonWidget, OO.ui.mixin.IndicatorElement );
2860 OO.mixinClass( OO.ui.ToggleButtonWidget, OO.ui.mixin.LabelElement );
2861 OO.mixinClass( OO.ui.ToggleButtonWidget, OO.ui.mixin.TitledElement );
2862 OO.mixinClass( OO.ui.ToggleButtonWidget, OO.ui.mixin.FlaggedElement );
2863 OO.mixinClass( OO.ui.ToggleButtonWidget, OO.ui.mixin.TabIndexedElement );
2864
2865 /* Static Properties */
2866
2867 /**
2868  * @static
2869  * @inheritdoc
2870  */
2871 OO.ui.ToggleButtonWidget.static.tagName = 'span';
2872
2873 /* Methods */
2874
2875 /**
2876  * Handle the button action being triggered.
2877  *
2878  * @private
2879  */
2880 OO.ui.ToggleButtonWidget.prototype.onAction = function () {
2881         this.setValue( !this.value );
2882 };
2883
2884 /**
2885  * @inheritdoc
2886  */
2887 OO.ui.ToggleButtonWidget.prototype.setValue = function ( value ) {
2888         value = !!value;
2889         if ( value !== this.value ) {
2890                 // Might be called from parent constructor before ButtonElement constructor
2891                 if ( this.$button ) {
2892                         this.$button.attr( 'aria-pressed', value.toString() );
2893                 }
2894                 this.setActive( value );
2895         }
2896
2897         // Parent method
2898         OO.ui.ToggleButtonWidget.parent.prototype.setValue.call( this, value );
2899
2900         return this;
2901 };
2902
2903 /**
2904  * @inheritdoc
2905  */
2906 OO.ui.ToggleButtonWidget.prototype.setButtonElement = function ( $button ) {
2907         if ( this.$button ) {
2908                 this.$button.removeAttr( 'aria-pressed' );
2909         }
2910         OO.ui.mixin.ButtonElement.prototype.setButtonElement.call( this, $button );
2911         this.$button.attr( 'aria-pressed', this.value.toString() );
2912 };
2913
2914 /**
2915  * ToggleSwitches are switches that slide on and off. Their state is represented by a Boolean
2916  * value (`true` for ‘on’, and `false` otherwise, the default). The ‘off’ state is represented
2917  * visually by a slider in the leftmost position.
2918  *
2919  *     @example
2920  *     // Toggle switches in the 'off' and 'on' position.
2921  *     var toggleSwitch1 = new OO.ui.ToggleSwitchWidget();
2922  *     var toggleSwitch2 = new OO.ui.ToggleSwitchWidget( {
2923  *         value: true
2924  *     } );
2925  *
2926  *     // Create a FieldsetLayout to layout and label switches
2927  *     var fieldset = new OO.ui.FieldsetLayout( {
2928  *        label: 'Toggle switches'
2929  *     } );
2930  *     fieldset.addItems( [
2931  *         new OO.ui.FieldLayout( toggleSwitch1, { label: 'Off', align: 'top' } ),
2932  *         new OO.ui.FieldLayout( toggleSwitch2, { label: 'On', align: 'top' } )
2933  *     ] );
2934  *     $( 'body' ).append( fieldset.$element );
2935  *
2936  * @class
2937  * @extends OO.ui.ToggleWidget
2938  * @mixins OO.ui.mixin.TabIndexedElement
2939  *
2940  * @constructor
2941  * @param {Object} [config] Configuration options
2942  * @cfg {boolean} [value=false] The toggle switch’s initial on/off state.
2943  *  By default, the toggle switch is in the 'off' position.
2944  */
2945 OO.ui.ToggleSwitchWidget = function OoUiToggleSwitchWidget( config ) {
2946         // Parent constructor
2947         OO.ui.ToggleSwitchWidget.parent.call( this, config );
2948
2949         // Mixin constructors
2950         OO.ui.mixin.TabIndexedElement.call( this, config );
2951
2952         // Properties
2953         this.dragging = false;
2954         this.dragStart = null;
2955         this.sliding = false;
2956         this.$glow = $( '<span>' );
2957         this.$grip = $( '<span>' );
2958
2959         // Events
2960         this.$element.on( {
2961                 click: this.onClick.bind( this ),
2962                 keypress: this.onKeyPress.bind( this )
2963         } );
2964
2965         // Initialization
2966         this.$glow.addClass( 'oo-ui-toggleSwitchWidget-glow' );
2967         this.$grip.addClass( 'oo-ui-toggleSwitchWidget-grip' );
2968         this.$element
2969                 .addClass( 'oo-ui-toggleSwitchWidget' )
2970                 .attr( 'role', 'checkbox' )
2971                 .append( this.$glow, this.$grip );
2972 };
2973
2974 /* Setup */
2975
2976 OO.inheritClass( OO.ui.ToggleSwitchWidget, OO.ui.ToggleWidget );
2977 OO.mixinClass( OO.ui.ToggleSwitchWidget, OO.ui.mixin.TabIndexedElement );
2978
2979 /* Methods */
2980
2981 /**
2982  * Handle mouse click events.
2983  *
2984  * @private
2985  * @param {jQuery.Event} e Mouse click event
2986  */
2987 OO.ui.ToggleSwitchWidget.prototype.onClick = function ( e ) {
2988         if ( !this.isDisabled() && e.which === OO.ui.MouseButtons.LEFT ) {
2989                 this.setValue( !this.value );
2990         }
2991         return false;
2992 };
2993
2994 /**
2995  * Handle key press events.
2996  *
2997  * @private
2998  * @param {jQuery.Event} e Key press event
2999  */
3000 OO.ui.ToggleSwitchWidget.prototype.onKeyPress = function ( e ) {
3001         if ( !this.isDisabled() && ( e.which === OO.ui.Keys.SPACE || e.which === OO.ui.Keys.ENTER ) ) {
3002                 this.setValue( !this.value );
3003                 return false;
3004         }
3005 };
3006
3007 /**
3008  * @inheritdoc
3009  */
3010 OO.ui.ToggleSwitchWidget.prototype.setValue = function ( value ) {
3011         OO.ui.ToggleSwitchWidget.parent.prototype.setValue.call( this, value );
3012         this.$element.attr( 'aria-checked', this.value.toString() );
3013         return this;
3014 };
3015
3016 /**
3017  * @inheritdoc
3018  */
3019 OO.ui.ToggleSwitchWidget.prototype.simulateLabelClick = function () {
3020         if ( !this.isDisabled() ) {
3021                 this.setValue( !this.value );
3022         }
3023         this.focus();
3024 };
3025
3026 /**
3027  * OutlineControlsWidget is a set of controls for an {@link OO.ui.OutlineSelectWidget outline select widget}.
3028  * Controls include moving items up and down, removing items, and adding different kinds of items.
3029  *
3030  * **Currently, this class is only used by {@link OO.ui.BookletLayout booklet layouts}.**
3031  *
3032  * @class
3033  * @extends OO.ui.Widget
3034  * @mixins OO.ui.mixin.GroupElement
3035  * @mixins OO.ui.mixin.IconElement
3036  *
3037  * @constructor
3038  * @param {OO.ui.OutlineSelectWidget} outline Outline to control
3039  * @param {Object} [config] Configuration options
3040  * @cfg {Object} [abilities] List of abilties
3041  * @cfg {boolean} [abilities.move=true] Allow moving movable items
3042  * @cfg {boolean} [abilities.remove=true] Allow removing removable items
3043  */
3044 OO.ui.OutlineControlsWidget = function OoUiOutlineControlsWidget( outline, config ) {
3045         // Allow passing positional parameters inside the config object
3046         if ( OO.isPlainObject( outline ) && config === undefined ) {
3047                 config = outline;
3048                 outline = config.outline;
3049         }
3050
3051         // Configuration initialization
3052         config = $.extend( { icon: 'add' }, config );
3053
3054         // Parent constructor
3055         OO.ui.OutlineControlsWidget.parent.call( this, config );
3056
3057         // Mixin constructors
3058         OO.ui.mixin.GroupElement.call( this, config );
3059         OO.ui.mixin.IconElement.call( this, config );
3060
3061         // Properties
3062         this.outline = outline;
3063         this.$movers = $( '<div>' );
3064         this.upButton = new OO.ui.ButtonWidget( {
3065                 framed: false,
3066                 icon: 'collapse',
3067                 title: OO.ui.msg( 'ooui-outline-control-move-up' )
3068         } );
3069         this.downButton = new OO.ui.ButtonWidget( {
3070                 framed: false,
3071                 icon: 'expand',
3072                 title: OO.ui.msg( 'ooui-outline-control-move-down' )
3073         } );
3074         this.removeButton = new OO.ui.ButtonWidget( {
3075                 framed: false,
3076                 icon: 'trash',
3077                 title: OO.ui.msg( 'ooui-outline-control-remove' )
3078         } );
3079         this.abilities = { move: true, remove: true };
3080
3081         // Events
3082         outline.connect( this, {
3083                 select: 'onOutlineChange',
3084                 add: 'onOutlineChange',
3085                 remove: 'onOutlineChange'
3086         } );
3087         this.upButton.connect( this, { click: [ 'emit', 'move', -1 ] } );
3088         this.downButton.connect( this, { click: [ 'emit', 'move', 1 ] } );
3089         this.removeButton.connect( this, { click: [ 'emit', 'remove' ] } );
3090
3091         // Initialization
3092         this.$element.addClass( 'oo-ui-outlineControlsWidget' );
3093         this.$group.addClass( 'oo-ui-outlineControlsWidget-items' );
3094         this.$movers
3095                 .addClass( 'oo-ui-outlineControlsWidget-movers' )
3096                 .append( this.removeButton.$element, this.upButton.$element, this.downButton.$element );
3097         this.$element.append( this.$icon, this.$group, this.$movers );
3098         this.setAbilities( config.abilities || {} );
3099 };
3100
3101 /* Setup */
3102
3103 OO.inheritClass( OO.ui.OutlineControlsWidget, OO.ui.Widget );
3104 OO.mixinClass( OO.ui.OutlineControlsWidget, OO.ui.mixin.GroupElement );
3105 OO.mixinClass( OO.ui.OutlineControlsWidget, OO.ui.mixin.IconElement );
3106
3107 /* Events */
3108
3109 /**
3110  * @event move
3111  * @param {number} places Number of places to move
3112  */
3113
3114 /**
3115  * @event remove
3116  */
3117
3118 /* Methods */
3119
3120 /**
3121  * Set abilities.
3122  *
3123  * @param {Object} abilities List of abilties
3124  * @param {boolean} [abilities.move] Allow moving movable items
3125  * @param {boolean} [abilities.remove] Allow removing removable items
3126  */
3127 OO.ui.OutlineControlsWidget.prototype.setAbilities = function ( abilities ) {
3128         var ability;
3129
3130         for ( ability in this.abilities ) {
3131                 if ( abilities[ ability ] !== undefined ) {
3132                         this.abilities[ ability ] = !!abilities[ ability ];
3133                 }
3134         }
3135
3136         this.onOutlineChange();
3137 };
3138
3139 /**
3140  * Handle outline change events.
3141  *
3142  * @private
3143  */
3144 OO.ui.OutlineControlsWidget.prototype.onOutlineChange = function () {
3145         var i, len, firstMovable, lastMovable,
3146                 items = this.outline.getItems(),
3147                 selectedItem = this.outline.findSelectedItem(),
3148                 movable = this.abilities.move && selectedItem && selectedItem.isMovable(),
3149                 removable = this.abilities.remove && selectedItem && selectedItem.isRemovable();
3150
3151         if ( movable ) {
3152                 i = -1;
3153                 len = items.length;
3154                 while ( ++i < len ) {
3155                         if ( items[ i ].isMovable() ) {
3156                                 firstMovable = items[ i ];
3157                                 break;
3158                         }
3159                 }
3160                 i = len;
3161                 while ( i-- ) {
3162                         if ( items[ i ].isMovable() ) {
3163                                 lastMovable = items[ i ];
3164                                 break;
3165                         }
3166                 }
3167         }
3168         this.upButton.setDisabled( !movable || selectedItem === firstMovable );
3169         this.downButton.setDisabled( !movable || selectedItem === lastMovable );
3170         this.removeButton.setDisabled( !removable );
3171 };
3172
3173 /**
3174  * OutlineOptionWidget is an item in an {@link OO.ui.OutlineSelectWidget OutlineSelectWidget}.
3175  *
3176  * Currently, this class is only used by {@link OO.ui.BookletLayout booklet layouts}, which contain
3177  * {@link OO.ui.PageLayout page layouts}. See {@link OO.ui.BookletLayout BookletLayout}
3178  * for an example.
3179  *
3180  * @class
3181  * @extends OO.ui.DecoratedOptionWidget
3182  *
3183  * @constructor
3184  * @param {Object} [config] Configuration options
3185  * @cfg {number} [level] Indentation level
3186  * @cfg {boolean} [movable] Allow modification from {@link OO.ui.OutlineControlsWidget outline controls}.
3187  */
3188 OO.ui.OutlineOptionWidget = function OoUiOutlineOptionWidget( config ) {
3189         // Configuration initialization
3190         config = config || {};
3191
3192         // Parent constructor
3193         OO.ui.OutlineOptionWidget.parent.call( this, config );
3194
3195         // Properties
3196         this.level = 0;
3197         this.movable = !!config.movable;
3198         this.removable = !!config.removable;
3199
3200         // Initialization
3201         this.$element.addClass( 'oo-ui-outlineOptionWidget' );
3202         this.setLevel( config.level );
3203 };
3204
3205 /* Setup */
3206
3207 OO.inheritClass( OO.ui.OutlineOptionWidget, OO.ui.DecoratedOptionWidget );
3208
3209 /* Static Properties */
3210
3211 /**
3212  * @static
3213  * @inheritdoc
3214  */
3215 OO.ui.OutlineOptionWidget.static.highlightable = true;
3216
3217 /**
3218  * @static
3219  * @inheritdoc
3220  */
3221 OO.ui.OutlineOptionWidget.static.scrollIntoViewOnSelect = true;
3222
3223 /**
3224  * @static
3225  * @inheritable
3226  * @property {string}
3227  */
3228 OO.ui.OutlineOptionWidget.static.levelClass = 'oo-ui-outlineOptionWidget-level-';
3229
3230 /**
3231  * @static
3232  * @inheritable
3233  * @property {number}
3234  */
3235 OO.ui.OutlineOptionWidget.static.levels = 3;
3236
3237 /* Methods */
3238
3239 /**
3240  * Check if item is movable.
3241  *
3242  * Movability is used by {@link OO.ui.OutlineControlsWidget outline controls}.
3243  *
3244  * @return {boolean} Item is movable
3245  */
3246 OO.ui.OutlineOptionWidget.prototype.isMovable = function () {
3247         return this.movable;
3248 };
3249
3250 /**
3251  * Check if item is removable.
3252  *
3253  * Removability is used by {@link OO.ui.OutlineControlsWidget outline controls}.
3254  *
3255  * @return {boolean} Item is removable
3256  */
3257 OO.ui.OutlineOptionWidget.prototype.isRemovable = function () {
3258         return this.removable;
3259 };
3260
3261 /**
3262  * Get indentation level.
3263  *
3264  * @return {number} Indentation level
3265  */
3266 OO.ui.OutlineOptionWidget.prototype.getLevel = function () {
3267         return this.level;
3268 };
3269
3270 /**
3271  * @inheritdoc
3272  */
3273 OO.ui.OutlineOptionWidget.prototype.setPressed = function ( state ) {
3274         OO.ui.OutlineOptionWidget.parent.prototype.setPressed.call( this, state );
3275         return this;
3276 };
3277
3278 /**
3279  * Set movability.
3280  *
3281  * Movability is used by {@link OO.ui.OutlineControlsWidget outline controls}.
3282  *
3283  * @param {boolean} movable Item is movable
3284  * @chainable
3285  */
3286 OO.ui.OutlineOptionWidget.prototype.setMovable = function ( movable ) {
3287         this.movable = !!movable;
3288         this.updateThemeClasses();
3289         return this;
3290 };
3291
3292 /**
3293  * Set removability.
3294  *
3295  * Removability is used by {@link OO.ui.OutlineControlsWidget outline controls}.
3296  *
3297  * @param {boolean} removable Item is removable
3298  * @chainable
3299  */
3300 OO.ui.OutlineOptionWidget.prototype.setRemovable = function ( removable ) {
3301         this.removable = !!removable;
3302         this.updateThemeClasses();
3303         return this;
3304 };
3305
3306 /**
3307  * @inheritdoc
3308  */
3309 OO.ui.OutlineOptionWidget.prototype.setSelected = function ( state ) {
3310         OO.ui.OutlineOptionWidget.parent.prototype.setSelected.call( this, state );
3311         return this;
3312 };
3313
3314 /**
3315  * Set indentation level.
3316  *
3317  * @param {number} [level=0] Indentation level, in the range of [0,#maxLevel]
3318  * @chainable
3319  */
3320 OO.ui.OutlineOptionWidget.prototype.setLevel = function ( level ) {
3321         var levels = this.constructor.static.levels,
3322                 levelClass = this.constructor.static.levelClass,
3323                 i = levels;
3324
3325         this.level = level ? Math.max( 0, Math.min( levels - 1, level ) ) : 0;
3326         while ( i-- ) {
3327                 if ( this.level === i ) {
3328                         this.$element.addClass( levelClass + i );
3329                 } else {
3330                         this.$element.removeClass( levelClass + i );
3331                 }
3332         }
3333         this.updateThemeClasses();
3334
3335         return this;
3336 };
3337
3338 /**
3339  * OutlineSelectWidget is a structured list that contains {@link OO.ui.OutlineOptionWidget outline options}
3340  * A set of controls can be provided with an {@link OO.ui.OutlineControlsWidget outline controls} widget.
3341  *
3342  * **Currently, this class is only used by {@link OO.ui.BookletLayout booklet layouts}.**
3343  *
3344  * @class
3345  * @extends OO.ui.SelectWidget
3346  * @mixins OO.ui.mixin.TabIndexedElement
3347  *
3348  * @constructor
3349  * @param {Object} [config] Configuration options
3350  */
3351 OO.ui.OutlineSelectWidget = function OoUiOutlineSelectWidget( config ) {
3352         // Parent constructor
3353         OO.ui.OutlineSelectWidget.parent.call( this, config );
3354
3355         // Mixin constructors
3356         OO.ui.mixin.TabIndexedElement.call( this, config );
3357
3358         // Events
3359         this.$element.on( {
3360                 focus: this.bindKeyDownListener.bind( this ),
3361                 blur: this.unbindKeyDownListener.bind( this )
3362         } );
3363
3364         // Initialization
3365         this.$element.addClass( 'oo-ui-outlineSelectWidget' );
3366 };
3367
3368 /* Setup */
3369
3370 OO.inheritClass( OO.ui.OutlineSelectWidget, OO.ui.SelectWidget );
3371 OO.mixinClass( OO.ui.OutlineSelectWidget, OO.ui.mixin.TabIndexedElement );
3372
3373 /**
3374  * ButtonOptionWidget is a special type of {@link OO.ui.mixin.ButtonElement button element} that
3375  * can be selected and configured with data. The class is
3376  * used with OO.ui.ButtonSelectWidget to create a selection of button options. Please see the
3377  * [OOUI documentation on MediaWiki] [1] for more information.
3378  *
3379  * [1]: https://www.mediawiki.org/wiki/OOUI/Widgets/Selects_and_Options#Button_selects_and_options
3380  *
3381  * @class
3382  * @extends OO.ui.OptionWidget
3383  * @mixins OO.ui.mixin.ButtonElement
3384  * @mixins OO.ui.mixin.IconElement
3385  * @mixins OO.ui.mixin.IndicatorElement
3386  * @mixins OO.ui.mixin.TitledElement
3387  *
3388  * @constructor
3389  * @param {Object} [config] Configuration options
3390  */
3391 OO.ui.ButtonOptionWidget = function OoUiButtonOptionWidget( config ) {
3392         // Configuration initialization
3393         config = config || {};
3394
3395         // Parent constructor
3396         OO.ui.ButtonOptionWidget.parent.call( this, config );
3397
3398         // Mixin constructors
3399         OO.ui.mixin.ButtonElement.call( this, config );
3400         OO.ui.mixin.IconElement.call( this, config );
3401         OO.ui.mixin.IndicatorElement.call( this, config );
3402         OO.ui.mixin.TitledElement.call( this, $.extend( {}, config, { $titled: this.$button } ) );
3403
3404         // Initialization
3405         this.$element.addClass( 'oo-ui-buttonOptionWidget' );
3406         this.$button.append( this.$icon, this.$label, this.$indicator );
3407         this.$element.append( this.$button );
3408 };
3409
3410 /* Setup */
3411
3412 OO.inheritClass( OO.ui.ButtonOptionWidget, OO.ui.OptionWidget );
3413 OO.mixinClass( OO.ui.ButtonOptionWidget, OO.ui.mixin.ButtonElement );
3414 OO.mixinClass( OO.ui.ButtonOptionWidget, OO.ui.mixin.IconElement );
3415 OO.mixinClass( OO.ui.ButtonOptionWidget, OO.ui.mixin.IndicatorElement );
3416 OO.mixinClass( OO.ui.ButtonOptionWidget, OO.ui.mixin.TitledElement );
3417
3418 /* Static Properties */
3419
3420 /**
3421  * Allow button mouse down events to pass through so they can be handled by the parent select widget
3422  *
3423  * @static
3424  * @inheritdoc
3425  */
3426 OO.ui.ButtonOptionWidget.static.cancelButtonMouseDownEvents = false;
3427
3428 /**
3429  * @static
3430  * @inheritdoc
3431  */
3432 OO.ui.ButtonOptionWidget.static.highlightable = false;
3433
3434 /* Methods */
3435
3436 /**
3437  * @inheritdoc
3438  */
3439 OO.ui.ButtonOptionWidget.prototype.setSelected = function ( state ) {
3440         OO.ui.ButtonOptionWidget.parent.prototype.setSelected.call( this, state );
3441
3442         if ( this.constructor.static.selectable ) {
3443                 this.setActive( state );
3444         }
3445
3446         return this;
3447 };
3448
3449 /**
3450  * ButtonSelectWidget is a {@link OO.ui.SelectWidget select widget} that contains
3451  * button options and is used together with
3452  * OO.ui.ButtonOptionWidget. The ButtonSelectWidget provides an interface for
3453  * highlighting, choosing, and selecting mutually exclusive options. Please see
3454  * the [OOUI documentation on MediaWiki] [1] for more information.
3455  *
3456  *     @example
3457  *     // Example: A ButtonSelectWidget that contains three ButtonOptionWidgets
3458  *     var option1 = new OO.ui.ButtonOptionWidget( {
3459  *         data: 1,
3460  *         label: 'Option 1',
3461  *         title: 'Button option 1'
3462  *     } );
3463  *
3464  *     var option2 = new OO.ui.ButtonOptionWidget( {
3465  *         data: 2,
3466  *         label: 'Option 2',
3467  *         title: 'Button option 2'
3468  *     } );
3469  *
3470  *     var option3 = new OO.ui.ButtonOptionWidget( {
3471  *         data: 3,
3472  *         label: 'Option 3',
3473  *         title: 'Button option 3'
3474  *     } );
3475  *
3476  *     var buttonSelect=new OO.ui.ButtonSelectWidget( {
3477  *         items: [ option1, option2, option3 ]
3478  *     } );
3479  *     $( 'body' ).append( buttonSelect.$element );
3480  *
3481  * [1]: https://www.mediawiki.org/wiki/OOUI/Widgets/Selects_and_Options
3482  *
3483  * @class
3484  * @extends OO.ui.SelectWidget
3485  * @mixins OO.ui.mixin.TabIndexedElement
3486  *
3487  * @constructor
3488  * @param {Object} [config] Configuration options
3489  */
3490 OO.ui.ButtonSelectWidget = function OoUiButtonSelectWidget( config ) {
3491         // Parent constructor
3492         OO.ui.ButtonSelectWidget.parent.call( this, config );
3493
3494         // Mixin constructors
3495         OO.ui.mixin.TabIndexedElement.call( this, config );
3496
3497         // Events
3498         this.$element.on( {
3499                 focus: this.bindKeyDownListener.bind( this ),
3500                 blur: this.unbindKeyDownListener.bind( this )
3501         } );
3502
3503         // Initialization
3504         this.$element.addClass( 'oo-ui-buttonSelectWidget' );
3505 };
3506
3507 /* Setup */
3508
3509 OO.inheritClass( OO.ui.ButtonSelectWidget, OO.ui.SelectWidget );
3510 OO.mixinClass( OO.ui.ButtonSelectWidget, OO.ui.mixin.TabIndexedElement );
3511
3512 /**
3513  * TabOptionWidget is an item in a {@link OO.ui.TabSelectWidget TabSelectWidget}.
3514  *
3515  * Currently, this class is only used by {@link OO.ui.IndexLayout index layouts}, which contain
3516  * {@link OO.ui.TabPanelLayout tab panel layouts}. See {@link OO.ui.IndexLayout IndexLayout}
3517  * for an example.
3518  *
3519  * @class
3520  * @extends OO.ui.OptionWidget
3521  *
3522  * @constructor
3523  * @param {Object} [config] Configuration options
3524  */
3525 OO.ui.TabOptionWidget = function OoUiTabOptionWidget( config ) {
3526         // Configuration initialization
3527         config = config || {};
3528
3529         // Parent constructor
3530         OO.ui.TabOptionWidget.parent.call( this, config );
3531
3532         // Initialization
3533         this.$element.addClass( 'oo-ui-tabOptionWidget' );
3534 };
3535
3536 /* Setup */
3537
3538 OO.inheritClass( OO.ui.TabOptionWidget, OO.ui.OptionWidget );
3539
3540 /* Static Properties */
3541
3542 /**
3543  * @static
3544  * @inheritdoc
3545  */
3546 OO.ui.TabOptionWidget.static.highlightable = false;
3547
3548 /**
3549  * TabSelectWidget is a list that contains {@link OO.ui.TabOptionWidget tab options}
3550  *
3551  * **Currently, this class is only used by {@link OO.ui.IndexLayout index layouts}.**
3552  *
3553  * @class
3554  * @extends OO.ui.SelectWidget
3555  * @mixins OO.ui.mixin.TabIndexedElement
3556  *
3557  * @constructor
3558  * @param {Object} [config] Configuration options
3559  */
3560 OO.ui.TabSelectWidget = function OoUiTabSelectWidget( config ) {
3561         // Parent constructor
3562         OO.ui.TabSelectWidget.parent.call( this, config );
3563
3564         // Mixin constructors
3565         OO.ui.mixin.TabIndexedElement.call( this, config );
3566
3567         // Events
3568         this.$element.on( {
3569                 focus: this.bindKeyDownListener.bind( this ),
3570                 blur: this.unbindKeyDownListener.bind( this )
3571         } );
3572
3573         // Initialization
3574         this.$element.addClass( 'oo-ui-tabSelectWidget' );
3575 };
3576
3577 /* Setup */
3578
3579 OO.inheritClass( OO.ui.TabSelectWidget, OO.ui.SelectWidget );
3580 OO.mixinClass( OO.ui.TabSelectWidget, OO.ui.mixin.TabIndexedElement );
3581
3582 /**
3583  * CapsuleItemWidgets are used within a {@link OO.ui.CapsuleMultiselectWidget
3584  * CapsuleMultiselectWidget} to display the selected items.
3585  *
3586  * @class
3587  * @extends OO.ui.Widget
3588  * @mixins OO.ui.mixin.ItemWidget
3589  * @mixins OO.ui.mixin.LabelElement
3590  * @mixins OO.ui.mixin.FlaggedElement
3591  * @mixins OO.ui.mixin.TabIndexedElement
3592  *
3593  * @constructor
3594  * @param {Object} [config] Configuration options
3595  */
3596 OO.ui.CapsuleItemWidget = function OoUiCapsuleItemWidget( config ) {
3597         // Configuration initialization
3598         config = config || {};
3599
3600         // Parent constructor
3601         OO.ui.CapsuleItemWidget.parent.call( this, config );
3602
3603         // Mixin constructors
3604         OO.ui.mixin.ItemWidget.call( this );
3605         OO.ui.mixin.LabelElement.call( this, config );
3606         OO.ui.mixin.FlaggedElement.call( this, config );
3607         OO.ui.mixin.TabIndexedElement.call( this, config );
3608
3609         // Events
3610         this.closeButton = new OO.ui.ButtonWidget( {
3611                 framed: false,
3612                 icon: 'close',
3613                 tabIndex: -1,
3614                 title: OO.ui.msg( 'ooui-item-remove' )
3615         } ).on( 'click', this.onCloseClick.bind( this ) );
3616
3617         this.on( 'disable', function ( disabled ) {
3618                 this.closeButton.setDisabled( disabled );
3619         }.bind( this ) );
3620
3621         // Initialization
3622         this.$element
3623                 .on( {
3624                         click: this.onClick.bind( this ),
3625                         keydown: this.onKeyDown.bind( this )
3626                 } )
3627                 .addClass( 'oo-ui-capsuleItemWidget' )
3628                 .append( this.$label, this.closeButton.$element );
3629 };
3630
3631 /* Setup */
3632
3633 OO.inheritClass( OO.ui.CapsuleItemWidget, OO.ui.Widget );
3634 OO.mixinClass( OO.ui.CapsuleItemWidget, OO.ui.mixin.ItemWidget );
3635 OO.mixinClass( OO.ui.CapsuleItemWidget, OO.ui.mixin.LabelElement );
3636 OO.mixinClass( OO.ui.CapsuleItemWidget, OO.ui.mixin.FlaggedElement );
3637 OO.mixinClass( OO.ui.CapsuleItemWidget, OO.ui.mixin.TabIndexedElement );
3638
3639 /* Methods */
3640
3641 /**
3642  * Handle close icon clicks
3643  */
3644 OO.ui.CapsuleItemWidget.prototype.onCloseClick = function () {
3645         var element = this.getElementGroup();
3646
3647         if ( element && $.isFunction( element.removeItems ) ) {
3648                 element.removeItems( [ this ] );
3649                 element.focus();
3650         }
3651 };
3652
3653 /**
3654  * Handle click event for the entire capsule
3655  */
3656 OO.ui.CapsuleItemWidget.prototype.onClick = function () {
3657         var element = this.getElementGroup();
3658
3659         if ( !this.isDisabled() && element && $.isFunction( element.editItem ) ) {
3660                 element.editItem( this );
3661         }
3662 };
3663
3664 /**
3665  * Handle keyDown event for the entire capsule
3666  *
3667  * @param {jQuery.Event} e Key down event
3668  */
3669 OO.ui.CapsuleItemWidget.prototype.onKeyDown = function ( e ) {
3670         var element = this.getElementGroup();
3671
3672         if ( e.keyCode === OO.ui.Keys.BACKSPACE || e.keyCode === OO.ui.Keys.DELETE ) {
3673                 element.removeItems( [ this ] );
3674                 element.focus();
3675                 return false;
3676         } else if ( e.keyCode === OO.ui.Keys.ENTER ) {
3677                 element.editItem( this );
3678                 return false;
3679         } else if ( e.keyCode === OO.ui.Keys.LEFT ) {
3680                 element.getPreviousItem( this ).focus();
3681         } else if ( e.keyCode === OO.ui.Keys.RIGHT ) {
3682                 element.getNextItem( this ).focus();
3683         }
3684 };
3685
3686 /**
3687  * CapsuleMultiselectWidgets are something like a {@link OO.ui.ComboBoxInputWidget combo box widget}
3688  * that allows for selecting multiple values.
3689  *
3690  * For more information about menus and options, please see the [OOUI documentation on MediaWiki][1].
3691  *
3692  *     @example
3693  *     // Example: A CapsuleMultiselectWidget.
3694  *     var capsule = new OO.ui.CapsuleMultiselectWidget( {
3695  *         label: 'CapsuleMultiselectWidget',
3696  *         selected: [ 'Option 1', 'Option 3' ],
3697  *         menu: {
3698  *             items: [
3699  *                 new OO.ui.MenuOptionWidget( {
3700  *                     data: 'Option 1',
3701  *                     label: 'Option One'
3702  *                 } ),
3703  *                 new OO.ui.MenuOptionWidget( {
3704  *                     data: 'Option 2',
3705  *                     label: 'Option Two'
3706  *                 } ),
3707  *                 new OO.ui.MenuOptionWidget( {
3708  *                     data: 'Option 3',
3709  *                     label: 'Option Three'
3710  *                 } ),
3711  *                 new OO.ui.MenuOptionWidget( {
3712  *                     data: 'Option 4',
3713  *                     label: 'Option Four'
3714  *                 } ),
3715  *                 new OO.ui.MenuOptionWidget( {
3716  *                     data: 'Option 5',
3717  *                     label: 'Option Five'
3718  *                 } )
3719  *             ]
3720  *         }
3721  *     } );
3722  *     $( 'body' ).append( capsule.$element );
3723  *
3724  * [1]: https://www.mediawiki.org/wiki/OOUI/Widgets/Selects_and_Options#Menu_selects_and_options
3725  *
3726  * @class
3727  * @extends OO.ui.Widget
3728  * @mixins OO.ui.mixin.GroupElement
3729  * @mixins OO.ui.mixin.PopupElement
3730  * @mixins OO.ui.mixin.TabIndexedElement
3731  * @mixins OO.ui.mixin.IndicatorElement
3732  * @mixins OO.ui.mixin.IconElement
3733  * @uses OO.ui.CapsuleItemWidget
3734  * @uses OO.ui.MenuSelectWidget
3735  *
3736  * @constructor
3737  * @param {Object} [config] Configuration options
3738  * @cfg {string} [placeholder] Placeholder text
3739  * @cfg {boolean} [allowArbitrary=false] Allow data items to be added even if not present in the menu.
3740  * @cfg {boolean} [allowDuplicates=false] Allow duplicate items to be added.
3741  * @cfg {Object} [menu] (required) Configuration options to pass to the
3742  *  {@link OO.ui.MenuSelectWidget menu select widget}.
3743  * @cfg {Object} [popup] Configuration options to pass to the {@link OO.ui.PopupWidget popup widget}.
3744  *  If specified, this popup will be shown instead of the menu (but the menu
3745  *  will still be used for item labels and allowArbitrary=false). The widgets
3746  *  in the popup should use {@link #addItemsFromData} or {@link #addItems} as necessary.
3747  * @cfg {jQuery} [$overlay=this.$element] Render the menu or popup into a separate layer.
3748  *  This configuration is useful in cases where the expanded menu is larger than
3749  *  its containing `<div>`. The specified overlay layer is usually on top of
3750  *  the containing `<div>` and has a larger area. By default, the menu uses
3751  *  relative positioning.
3752  *  See <https://www.mediawiki.org/wiki/OOUI/Concepts#Overlays>.
3753  */
3754 OO.ui.CapsuleMultiselectWidget = function OoUiCapsuleMultiselectWidget( config ) {
3755         var $tabFocus;
3756
3757         // Parent constructor
3758         OO.ui.CapsuleMultiselectWidget.parent.call( this, config );
3759
3760         // Configuration initialization
3761         config = $.extend( {
3762                 allowArbitrary: false,
3763                 allowDuplicates: false
3764         }, config );
3765
3766         // Properties (must be set before mixin constructor calls)
3767         this.$handle = $( '<div>' );
3768         this.$input = config.popup ? null : $( '<input>' );
3769         if ( config.placeholder !== undefined && config.placeholder !== '' ) {
3770                 this.$input.attr( 'placeholder', config.placeholder );
3771         }
3772
3773         // Mixin constructors
3774         OO.ui.mixin.GroupElement.call( this, config );
3775         if ( config.popup ) {
3776                 config.popup = $.extend( {}, config.popup, {
3777                         align: 'forwards',
3778                         anchor: false
3779                 } );
3780                 OO.ui.mixin.PopupElement.call( this, config );
3781                 $tabFocus = $( '<span>' );
3782                 OO.ui.mixin.TabIndexedElement.call( this, $.extend( {}, config, { $tabIndexed: $tabFocus } ) );
3783         } else {
3784                 this.popup = null;
3785                 $tabFocus = null;
3786                 OO.ui.mixin.TabIndexedElement.call( this, $.extend( {}, config, { $tabIndexed: this.$input } ) );
3787         }
3788         OO.ui.mixin.IndicatorElement.call( this, config );
3789         OO.ui.mixin.IconElement.call( this, config );
3790
3791         // Properties
3792         this.$content = $( '<div>' );
3793         this.allowArbitrary = config.allowArbitrary;
3794         this.allowDuplicates = config.allowDuplicates;
3795         this.$overlay = ( config.$overlay === true ? OO.ui.getDefaultOverlay() : config.$overlay ) || this.$element;
3796         this.menu = new OO.ui.MenuSelectWidget( $.extend(
3797                 {
3798                         widget: this,
3799                         $input: this.$input,
3800                         $floatableContainer: this.$element,
3801                         filterFromInput: true,
3802                         disabled: this.isDisabled()
3803                 },
3804                 config.menu
3805         ) );
3806
3807         // Events
3808         if ( this.popup ) {
3809                 $tabFocus.on( {
3810                         focus: this.focus.bind( this )
3811                 } );
3812                 this.popup.$element.on( 'focusout', this.onPopupFocusOut.bind( this ) );
3813                 if ( this.popup.$autoCloseIgnore ) {
3814                         this.popup.$autoCloseIgnore.on( 'focusout', this.onPopupFocusOut.bind( this ) );
3815                 }
3816                 this.popup.connect( this, {
3817                         toggle: function ( visible ) {
3818                                 $tabFocus.toggle( !visible );
3819                         }
3820                 } );
3821         } else {
3822                 this.$input.on( {
3823                         focus: this.onInputFocus.bind( this ),
3824                         blur: this.onInputBlur.bind( this ),
3825                         'propertychange change click mouseup keydown keyup input cut paste select focus':
3826                                 OO.ui.debounce( this.updateInputSize.bind( this ) ),
3827                         keydown: this.onKeyDown.bind( this ),
3828                         keypress: this.onKeyPress.bind( this )
3829                 } );
3830         }
3831         this.menu.connect( this, {
3832                 choose: 'onMenuChoose',
3833                 toggle: 'onMenuToggle',
3834                 add: 'onMenuItemsChange',
3835                 remove: 'onMenuItemsChange'
3836         } );
3837         this.$handle.on( {
3838                 mousedown: this.onMouseDown.bind( this )
3839         } );
3840
3841         // Initialization
3842         if ( this.$input ) {
3843                 this.$input.prop( 'disabled', this.isDisabled() );
3844                 this.$input.attr( {
3845                         role: 'combobox',
3846                         'aria-owns': this.menu.getElementId(),
3847                         'aria-autocomplete': 'list'
3848                 } );
3849         }
3850         if ( config.data ) {
3851                 this.setItemsFromData( config.data );
3852         }
3853         this.$content.addClass( 'oo-ui-capsuleMultiselectWidget-content' )
3854                 .append( this.$group );
3855         this.$group.addClass( 'oo-ui-capsuleMultiselectWidget-group' );
3856         this.$handle.addClass( 'oo-ui-capsuleMultiselectWidget-handle' )
3857                 .append( this.$indicator, this.$icon, this.$content );
3858         this.$element.addClass( 'oo-ui-capsuleMultiselectWidget' )
3859                 .append( this.$handle );
3860         if ( this.popup ) {
3861                 this.popup.$element.addClass( 'oo-ui-capsuleMultiselectWidget-popup' );
3862                 this.$content.append( $tabFocus );
3863                 this.$overlay.append( this.popup.$element );
3864         } else {
3865                 this.$content.append( this.$input );
3866                 this.$overlay.append( this.menu.$element );
3867         }
3868         if ( $tabFocus ) {
3869                 $tabFocus.addClass( 'oo-ui-capsuleMultiselectWidget-focusTrap' );
3870         }
3871
3872         // Input size needs to be calculated after everything else is rendered
3873         setTimeout( function () {
3874                 if ( this.$input ) {
3875                         this.updateInputSize();
3876                 }
3877         }.bind( this ) );
3878
3879         this.onMenuItemsChange();
3880 };
3881
3882 /* Setup */
3883
3884 OO.inheritClass( OO.ui.CapsuleMultiselectWidget, OO.ui.Widget );
3885 OO.mixinClass( OO.ui.CapsuleMultiselectWidget, OO.ui.mixin.GroupElement );
3886 OO.mixinClass( OO.ui.CapsuleMultiselectWidget, OO.ui.mixin.PopupElement );
3887 OO.mixinClass( OO.ui.CapsuleMultiselectWidget, OO.ui.mixin.TabIndexedElement );
3888 OO.mixinClass( OO.ui.CapsuleMultiselectWidget, OO.ui.mixin.IndicatorElement );
3889 OO.mixinClass( OO.ui.CapsuleMultiselectWidget, OO.ui.mixin.IconElement );
3890
3891 /* Events */
3892
3893 /**
3894  * @event change
3895  *
3896  * A change event is emitted when the set of selected items changes.
3897  *
3898  * @param {Mixed[]} datas Data of the now-selected items
3899  */
3900
3901 /**
3902  * @event resize
3903  *
3904  * A resize event is emitted when the widget's dimensions change to accomodate newly added items or
3905  * current user input.
3906  */
3907
3908 /* Methods */
3909
3910 /**
3911  * Construct a OO.ui.CapsuleItemWidget (or a subclass thereof) from given label and data.
3912  * May return `null` if the given label and data are not valid.
3913  *
3914  * @protected
3915  * @param {Mixed} data Custom data of any type.
3916  * @param {string} label The label text.
3917  * @return {OO.ui.CapsuleItemWidget|null}
3918  */
3919 OO.ui.CapsuleMultiselectWidget.prototype.createItemWidget = function ( data, label ) {
3920         if ( label === '' ) {
3921                 return null;
3922         }
3923         return new OO.ui.CapsuleItemWidget( { data: data, label: label } );
3924 };
3925
3926 /**
3927  * @inheritdoc
3928  */
3929 OO.ui.CapsuleMultiselectWidget.prototype.getInputId = function () {
3930         if ( !this.$input ) {
3931                 return null;
3932         }
3933         return OO.ui.mixin.TabIndexedElement.prototype.getInputId.call( this );
3934 };
3935
3936 /**
3937  * Get the data of the items in the capsule
3938  *
3939  * @return {Mixed[]}
3940  */
3941 OO.ui.CapsuleMultiselectWidget.prototype.getItemsData = function () {
3942         return this.getItems().map( function ( item ) {
3943                 return item.data;
3944         } );
3945 };
3946
3947 /**
3948  * Set the items in the capsule by providing data
3949  *
3950  * @chainable
3951  * @param {Mixed[]} datas
3952  * @return {OO.ui.CapsuleMultiselectWidget}
3953  */
3954 OO.ui.CapsuleMultiselectWidget.prototype.setItemsFromData = function ( datas ) {
3955         var widget = this,
3956                 menu = this.menu,
3957                 items = this.getItems();
3958
3959         $.each( datas, function ( i, data ) {
3960                 var j, label,
3961                         item = menu.findItemFromData( data );
3962
3963                 if ( item ) {
3964                         label = item.label;
3965                 } else if ( widget.allowArbitrary ) {
3966                         label = String( data );
3967                 } else {
3968                         return;
3969                 }
3970
3971                 item = null;
3972                 for ( j = 0; j < items.length; j++ ) {
3973                         if ( items[ j ].data === data && items[ j ].label === label ) {
3974                                 item = items[ j ];
3975                                 items.splice( j, 1 );
3976                                 break;
3977                         }
3978                 }
3979                 if ( !item ) {
3980                         item = widget.createItemWidget( data, label );
3981                 }
3982                 if ( item ) {
3983                         widget.addItems( [ item ], i );
3984                 }
3985         } );
3986
3987         if ( items.length ) {
3988                 widget.removeItems( items );
3989         }
3990
3991         return this;
3992 };
3993
3994 /**
3995  * Add items to the capsule by providing their data
3996  *
3997  * @chainable
3998  * @param {Mixed[]} datas
3999  * @return {OO.ui.CapsuleMultiselectWidget}
4000  */
4001 OO.ui.CapsuleMultiselectWidget.prototype.addItemsFromData = function ( datas ) {
4002         var widget = this,
4003                 menu = this.menu,
4004                 items = [];
4005
4006         $.each( datas, function ( i, data ) {
4007                 var item;
4008
4009                 if ( !widget.findItemFromData( data ) || widget.allowDuplicates ) {
4010                         item = menu.findItemFromData( data );
4011                         if ( item ) {
4012                                 item = widget.createItemWidget( data, item.label );
4013                         } else if ( widget.allowArbitrary ) {
4014                                 item = widget.createItemWidget( data, String( data ) );
4015                         }
4016                         if ( item ) {
4017                                 items.push( item );
4018                         }
4019                 }
4020         } );
4021
4022         if ( items.length ) {
4023                 this.addItems( items );
4024         }
4025
4026         return this;
4027 };
4028
4029 /**
4030  * Add items to the capsule by providing a label
4031  *
4032  * @param {string} label
4033  * @return {boolean} Whether the item was added or not
4034  */
4035 OO.ui.CapsuleMultiselectWidget.prototype.addItemFromLabel = function ( label ) {
4036         var item, items;
4037         item = this.menu.getItemFromLabel( label, true );
4038         if ( item ) {
4039                 this.addItemsFromData( [ item.data ] );
4040                 return true;
4041         } else if ( this.allowArbitrary ) {
4042                 items = this.getItems();
4043                 this.addItemsFromData( [ label ] );
4044                 return !OO.compare( this.getItems(), items );
4045         }
4046         return false;
4047 };
4048
4049 /**
4050  * Remove items by data
4051  *
4052  * @chainable
4053  * @param {Mixed[]} datas
4054  * @return {OO.ui.CapsuleMultiselectWidget}
4055  */
4056 OO.ui.CapsuleMultiselectWidget.prototype.removeItemsFromData = function ( datas ) {
4057         var widget = this,
4058                 items = [];
4059
4060         $.each( datas, function ( i, data ) {
4061                 var item = widget.findItemFromData( data );
4062                 if ( item ) {
4063                         items.push( item );
4064                 }
4065         } );
4066
4067         if ( items.length ) {
4068                 this.removeItems( items );
4069         }
4070
4071         return this;
4072 };
4073
4074 /**
4075  * @inheritdoc
4076  */
4077 OO.ui.CapsuleMultiselectWidget.prototype.addItems = function ( items ) {
4078         var same, i, l,
4079                 oldItems = this.items.slice();
4080
4081         OO.ui.mixin.GroupElement.prototype.addItems.call( this, items );
4082
4083         if ( this.items.length !== oldItems.length ) {
4084                 same = false;
4085         } else {
4086                 same = true;
4087                 for ( i = 0, l = oldItems.length; same && i < l; i++ ) {
4088                         same = same && this.items[ i ] === oldItems[ i ];
4089                 }
4090         }
4091         if ( !same ) {
4092                 this.emit( 'change', this.getItemsData() );
4093                 this.updateInputSize();
4094         }
4095
4096         return this;
4097 };
4098
4099 /**
4100  * Removes the item from the list and copies its label to `this.$input`.
4101  *
4102  * @param {Object} item
4103  */
4104 OO.ui.CapsuleMultiselectWidget.prototype.editItem = function ( item ) {
4105         this.addItemFromLabel( this.$input.val() );
4106         this.clearInput();
4107         this.$input.val( item.label );
4108         this.updateInputSize();
4109         this.focus();
4110         this.menu.updateItemVisibility(); // Hack, we shouldn't be calling this method directly
4111         this.removeItems( [ item ] );
4112 };
4113
4114 /**
4115  * @inheritdoc
4116  */
4117 OO.ui.CapsuleMultiselectWidget.prototype.removeItems = function ( items ) {
4118         var same, i, l,
4119                 oldItems = this.items.slice();
4120
4121         OO.ui.mixin.GroupElement.prototype.removeItems.call( this, items );
4122
4123         if ( this.items.length !== oldItems.length ) {
4124                 same = false;
4125         } else {
4126                 same = true;
4127                 for ( i = 0, l = oldItems.length; same && i < l; i++ ) {
4128                         same = same && this.items[ i ] === oldItems[ i ];
4129                 }
4130         }
4131         if ( !same ) {
4132                 this.emit( 'change', this.getItemsData() );
4133                 this.updateInputSize();
4134         }
4135
4136         return this;
4137 };
4138
4139 /**
4140  * @inheritdoc
4141  */
4142 OO.ui.CapsuleMultiselectWidget.prototype.clearItems = function () {
4143         if ( this.items.length ) {
4144                 OO.ui.mixin.GroupElement.prototype.clearItems.call( this );
4145                 this.emit( 'change', this.getItemsData() );
4146                 this.updateInputSize();
4147         }
4148         return this;
4149 };
4150
4151 /**
4152  * Given an item, returns the item after it. If its the last item,
4153  * returns `this.$input`. If no item is passed, returns the very first
4154  * item.
4155  *
4156  * @param {OO.ui.CapsuleItemWidget} [item]
4157  * @return {OO.ui.CapsuleItemWidget|jQuery|boolean}
4158  */
4159 OO.ui.CapsuleMultiselectWidget.prototype.getNextItem = function ( item ) {
4160         var itemIndex;
4161
4162         if ( item === undefined ) {
4163                 return this.items[ 0 ];
4164         }
4165
4166         itemIndex = this.items.indexOf( item );
4167         if ( itemIndex < 0 ) { // Item not in list
4168                 return false;
4169         } else if ( itemIndex === this.items.length - 1 ) { // Last item
4170                 return this.$input;
4171         } else {
4172                 return this.items[ itemIndex + 1 ];
4173         }
4174 };
4175
4176 /**
4177  * Given an item, returns the item before it. If its the first item,
4178  * returns `this.$input`. If no item is passed, returns the very last
4179  * item.
4180  *
4181  * @param {OO.ui.CapsuleItemWidget} [item]
4182  * @return {OO.ui.CapsuleItemWidget|jQuery|boolean}
4183  */
4184 OO.ui.CapsuleMultiselectWidget.prototype.getPreviousItem = function ( item ) {
4185         var itemIndex;
4186
4187         if ( item === undefined ) {
4188                 return this.items[ this.items.length - 1 ];
4189         }
4190
4191         itemIndex = this.items.indexOf( item );
4192         if ( itemIndex < 0 ) { // Item not in list
4193                 return false;
4194         } else if ( itemIndex === 0 ) { // First item
4195                 return this.$input;
4196         } else {
4197                 return this.items[ itemIndex - 1 ];
4198         }
4199 };
4200
4201 /**
4202  * Get the capsule widget's menu.
4203  *
4204  * @return {OO.ui.MenuSelectWidget} Menu widget
4205  */
4206 OO.ui.CapsuleMultiselectWidget.prototype.getMenu = function () {
4207         return this.menu;
4208 };
4209
4210 /**
4211  * Handle focus events
4212  *
4213  * @private
4214  * @param {jQuery.Event} event
4215  */
4216 OO.ui.CapsuleMultiselectWidget.prototype.onInputFocus = function () {
4217         if ( !this.isDisabled() ) {
4218                 this.updateInputSize();
4219                 this.menu.toggle( true );
4220         }
4221 };
4222
4223 /**
4224  * Handle blur events
4225  *
4226  * @private
4227  * @param {jQuery.Event} event
4228  */
4229 OO.ui.CapsuleMultiselectWidget.prototype.onInputBlur = function () {
4230         this.addItemFromLabel( this.$input.val() );
4231         this.clearInput();
4232 };
4233
4234 /**
4235  * Handles popup focus out events.
4236  *
4237  * @private
4238  * @param {jQuery.Event} e Focus out event
4239  */
4240 OO.ui.CapsuleMultiselectWidget.prototype.onPopupFocusOut = function () {
4241         var widget = this.popup;
4242
4243         setTimeout( function () {
4244                 if (
4245                         widget.isVisible() &&
4246                         !OO.ui.contains( widget.$element.add( widget.$autoCloseIgnore ).get(), document.activeElement, true )
4247                 ) {
4248                         widget.toggle( false );
4249                 }
4250         } );
4251 };
4252
4253 /**
4254  * Handle mouse down events.
4255  *
4256  * @private
4257  * @param {jQuery.Event} e Mouse down event
4258  */
4259 OO.ui.CapsuleMultiselectWidget.prototype.onMouseDown = function ( e ) {
4260         if ( e.which === OO.ui.MouseButtons.LEFT ) {
4261                 this.focus();
4262                 return false;
4263         } else {
4264                 this.updateInputSize();
4265         }
4266 };
4267
4268 /**
4269  * Handle key press events.
4270  *
4271  * @private
4272  * @param {jQuery.Event} e Key press event
4273  */
4274 OO.ui.CapsuleMultiselectWidget.prototype.onKeyPress = function ( e ) {
4275         if ( !this.isDisabled() ) {
4276                 if ( e.which === OO.ui.Keys.ESCAPE ) {
4277                         this.clearInput();
4278                         return false;
4279                 }
4280
4281                 if ( !this.popup ) {
4282                         this.menu.toggle( true );
4283                         if ( e.which === OO.ui.Keys.ENTER ) {
4284                                 if ( this.addItemFromLabel( this.$input.val() ) ) {
4285                                         this.clearInput();
4286                                 }
4287                                 return false;
4288                         }
4289
4290                         // Make sure the input gets resized.
4291                         setTimeout( this.updateInputSize.bind( this ), 0 );
4292                 }
4293         }
4294 };
4295
4296 /**
4297  * Handle key down events.
4298  *
4299  * @private
4300  * @param {jQuery.Event} e Key down event
4301  */
4302 OO.ui.CapsuleMultiselectWidget.prototype.onKeyDown = function ( e ) {
4303         if (
4304                 !this.isDisabled() &&
4305                 this.$input.val() === '' &&
4306                 this.items.length
4307         ) {
4308                 // 'keypress' event is not triggered for Backspace
4309                 if ( e.keyCode === OO.ui.Keys.BACKSPACE ) {
4310                         if ( e.metaKey || e.ctrlKey ) {
4311                                 this.removeItems( this.items.slice( -1 ) );
4312                         } else {
4313                                 this.editItem( this.items[ this.items.length - 1 ] );
4314                         }
4315                         return false;
4316                 } else if ( e.keyCode === OO.ui.Keys.LEFT ) {
4317                         this.getPreviousItem().focus();
4318                 } else if ( e.keyCode === OO.ui.Keys.RIGHT ) {
4319                         this.getNextItem().focus();
4320                 }
4321         }
4322 };
4323
4324 /**
4325  * Update the dimensions of the text input field to encompass all available area.
4326  *
4327  * @private
4328  * @param {jQuery.Event} e Event of some sort
4329  */
4330 OO.ui.CapsuleMultiselectWidget.prototype.updateInputSize = function () {
4331         var $lastItem, direction, contentWidth, currentWidth, bestWidth;
4332         if ( this.$input && !this.isDisabled() ) {
4333                 this.$input.css( 'width', '1em' );
4334                 $lastItem = this.$group.children().last();
4335                 direction = OO.ui.Element.static.getDir( this.$handle );
4336
4337                 // Get the width of the input with the placeholder text as
4338                 // the value and save it so that we don't keep recalculating
4339                 if (
4340                         this.contentWidthWithPlaceholder === undefined &&
4341                         this.$input.val() === '' &&
4342                         this.$input.attr( 'placeholder' ) !== undefined
4343                 ) {
4344                         this.$input.val( this.$input.attr( 'placeholder' ) );
4345                         this.contentWidthWithPlaceholder = this.$input[ 0 ].scrollWidth;
4346                         this.$input.val( '' );
4347
4348                 }
4349
4350                 // Always keep the input wide enough for the placeholder text
4351                 contentWidth = Math.max(
4352                         this.$input[ 0 ].scrollWidth,
4353                         // undefined arguments in Math.max lead to NaN
4354                         ( this.contentWidthWithPlaceholder === undefined ) ?
4355                                 0 : this.contentWidthWithPlaceholder
4356                 );
4357                 currentWidth = this.$input.width();
4358
4359                 if ( contentWidth < currentWidth ) {
4360                         this.updateIfHeightChanged();
4361                         // All is fine, don't perform expensive calculations
4362                         return;
4363                 }
4364
4365                 if ( $lastItem.length === 0 ) {
4366                         bestWidth = this.$content.innerWidth();
4367                 } else {
4368                         bestWidth = direction === 'ltr' ?
4369                                 this.$content.innerWidth() - $lastItem.position().left - $lastItem.outerWidth() :
4370                                 $lastItem.position().left;
4371                 }
4372
4373                 // Some safety margin for sanity, because I *really* don't feel like finding out where the few
4374                 // pixels this is off by are coming from.
4375                 bestWidth -= 10;
4376                 if ( contentWidth > bestWidth ) {
4377                         // This will result in the input getting shifted to the next line
4378                         bestWidth = this.$content.innerWidth() - 10;
4379                 }
4380                 this.$input.width( Math.floor( bestWidth ) );
4381                 this.updateIfHeightChanged();
4382         } else {
4383                 this.updateIfHeightChanged();
4384         }
4385 };
4386
4387 /**
4388  * Determine if widget height changed, and if so, update menu position and emit 'resize' event.
4389  *
4390  * @private
4391  */
4392 OO.ui.CapsuleMultiselectWidget.prototype.updateIfHeightChanged = function () {
4393         var height = this.$element.height();
4394         if ( height !== this.height ) {
4395                 this.height = height;
4396                 this.menu.position();
4397                 if ( this.popup ) {
4398                         this.popup.updateDimensions();
4399                 }
4400                 this.emit( 'resize' );
4401         }
4402 };
4403
4404 /**
4405  * Handle menu choose events.
4406  *
4407  * @private
4408  * @param {OO.ui.OptionWidget} item Chosen item
4409  */
4410 OO.ui.CapsuleMultiselectWidget.prototype.onMenuChoose = function ( item ) {
4411         if ( item && item.isVisible() ) {
4412                 this.addItemsFromData( [ item.getData() ] );
4413                 this.clearInput();
4414         }
4415 };
4416
4417 /**
4418  * Handle menu toggle events.
4419  *
4420  * @private
4421  * @param {boolean} isVisible Open state of the menu
4422  */
4423 OO.ui.CapsuleMultiselectWidget.prototype.onMenuToggle = function ( isVisible ) {
4424         this.$element.toggleClass( 'oo-ui-capsuleMultiselectWidget-open', isVisible );
4425 };
4426
4427 /**
4428  * Handle menu item change events.
4429  *
4430  * @private
4431  */
4432 OO.ui.CapsuleMultiselectWidget.prototype.onMenuItemsChange = function () {
4433         this.setItemsFromData( this.getItemsData() );
4434         this.$element.toggleClass( 'oo-ui-capsuleMultiselectWidget-empty', this.menu.isEmpty() );
4435 };
4436
4437 /**
4438  * Clear the input field
4439  *
4440  * @private
4441  */
4442 OO.ui.CapsuleMultiselectWidget.prototype.clearInput = function () {
4443         if ( this.$input ) {
4444                 this.$input.val( '' );
4445                 this.updateInputSize();
4446         }
4447         if ( this.popup ) {
4448                 this.popup.toggle( false );
4449         }
4450         this.menu.toggle( false );
4451         this.menu.selectItem();
4452         this.menu.highlightItem();
4453 };
4454
4455 /**
4456  * @inheritdoc
4457  */
4458 OO.ui.CapsuleMultiselectWidget.prototype.setDisabled = function ( disabled ) {
4459         var i, len;
4460
4461         // Parent method
4462         OO.ui.CapsuleMultiselectWidget.parent.prototype.setDisabled.call( this, disabled );
4463
4464         if ( this.$input ) {
4465                 this.$input.prop( 'disabled', this.isDisabled() );
4466         }
4467         if ( this.menu ) {
4468                 this.menu.setDisabled( this.isDisabled() );
4469         }
4470         if ( this.popup ) {
4471                 this.popup.setDisabled( this.isDisabled() );
4472         }
4473
4474         if ( this.items ) {
4475                 for ( i = 0, len = this.items.length; i < len; i++ ) {
4476                         this.items[ i ].updateDisabled();
4477                 }
4478         }
4479
4480         return this;
4481 };
4482
4483 /**
4484  * Focus the widget
4485  *
4486  * @chainable
4487  */
4488 OO.ui.CapsuleMultiselectWidget.prototype.focus = function () {
4489         if ( !this.isDisabled() ) {
4490                 if ( this.popup ) {
4491                         this.popup.setSize( this.$handle.outerWidth() );
4492                         this.popup.toggle( true );
4493                         OO.ui.findFocusable( this.popup.$element ).focus();
4494                 } else {
4495                         OO.ui.mixin.TabIndexedElement.prototype.focus.call( this );
4496                 }
4497         }
4498         return this;
4499 };
4500
4501 /**
4502  * TagItemWidgets are used within a {@link OO.ui.TagMultiselectWidget
4503  * TagMultiselectWidget} to display the selected items.
4504  *
4505  * @class
4506  * @extends OO.ui.Widget
4507  * @mixins OO.ui.mixin.ItemWidget
4508  * @mixins OO.ui.mixin.LabelElement
4509  * @mixins OO.ui.mixin.FlaggedElement
4510  * @mixins OO.ui.mixin.TabIndexedElement
4511  * @mixins OO.ui.mixin.DraggableElement
4512  *
4513  * @constructor
4514  * @param {Object} [config] Configuration object
4515  * @cfg {boolean} [valid=true] Item is valid
4516  */
4517 OO.ui.TagItemWidget = function OoUiTagItemWidget( config ) {
4518         config = config || {};
4519
4520         // Parent constructor
4521         OO.ui.TagItemWidget.parent.call( this, config );
4522
4523         // Mixin constructors
4524         OO.ui.mixin.ItemWidget.call( this );
4525         OO.ui.mixin.LabelElement.call( this, config );
4526         OO.ui.mixin.FlaggedElement.call( this, config );
4527         OO.ui.mixin.TabIndexedElement.call( this, config );
4528         OO.ui.mixin.DraggableElement.call( this, config );
4529
4530         this.valid = config.valid === undefined ? true : !!config.valid;
4531
4532         this.closeButton = new OO.ui.ButtonWidget( {
4533                 framed: false,
4534                 icon: 'close',
4535                 tabIndex: -1,
4536                 title: OO.ui.msg( 'ooui-item-remove' )
4537         } );
4538         this.closeButton.setDisabled( this.isDisabled() );
4539
4540         // Events
4541         this.closeButton
4542                 .connect( this, { click: 'remove' } );
4543         this.$element
4544                 .on( 'click', this.select.bind( this ) )
4545                 .on( 'keydown', this.onKeyDown.bind( this ) )
4546                 // Prevent propagation of mousedown; the tag item "lives" in the
4547                 // clickable area of the TagMultiselectWidget, which listens to
4548                 // mousedown to open the menu or popup. We want to prevent that
4549                 // for clicks specifically on the tag itself, so the actions taken
4550                 // are more deliberate. When the tag is clicked, it will emit the
4551                 // selection event (similar to how #OO.ui.MultioptionWidget emits 'change')
4552                 // and can be handled separately.
4553                 .on( 'mousedown', function ( e ) { e.stopPropagation(); } );
4554
4555         // Initialization
4556         this.$element
4557                 .addClass( 'oo-ui-tagItemWidget' )
4558                 .append( this.$label, this.closeButton.$element );
4559 };
4560
4561 /* Initialization */
4562
4563 OO.inheritClass( OO.ui.TagItemWidget, OO.ui.Widget );
4564 OO.mixinClass( OO.ui.TagItemWidget, OO.ui.mixin.ItemWidget );
4565 OO.mixinClass( OO.ui.TagItemWidget, OO.ui.mixin.LabelElement );
4566 OO.mixinClass( OO.ui.TagItemWidget, OO.ui.mixin.FlaggedElement );
4567 OO.mixinClass( OO.ui.TagItemWidget, OO.ui.mixin.TabIndexedElement );
4568 OO.mixinClass( OO.ui.TagItemWidget, OO.ui.mixin.DraggableElement );
4569
4570 /* Events */
4571
4572 /**
4573  * @event remove
4574  *
4575  * A remove action was performed on the item
4576  */
4577
4578 /**
4579  * @event navigate
4580  * @param {string} direction Direction of the movement, forward or backwards
4581  *
4582  * A navigate action was performed on the item
4583  */
4584
4585 /**
4586  * @event select
4587  *
4588  * The tag widget was selected. This can occur when the widget
4589  * is either clicked or enter was pressed on it.
4590  */
4591
4592 /**
4593  * @event valid
4594  * @param {boolean} isValid Item is valid
4595  *
4596  * Item validity has changed
4597  */
4598
4599 /**
4600  * @event disabled
4601  * @param {boolean} isDisabled Item is disabled
4602  *
4603  * Item disabled state has changed
4604  */
4605
4606 /* Methods */
4607
4608 /**
4609  * @inheritdoc
4610  * @fires disabled
4611  */
4612 OO.ui.TagItemWidget.prototype.setDisabled = function ( state ) {
4613         // Parent method
4614         OO.ui.TagItemWidget.parent.prototype.setDisabled.call( this, state );
4615
4616         if ( this.closeButton ) {
4617                 this.closeButton.setDisabled( state );
4618         }
4619
4620         this.emit( 'disabled', this.isDisabled() );
4621         return this;
4622 };
4623
4624 /**
4625  * Handle removal of the item
4626  *
4627  * This is mainly for extensibility concerns, so other children
4628  * of this class can change the behavior if they need to. This
4629  * is called by both clicking the 'remove' button but also
4630  * on keypress, which is harder to override if needed.
4631  *
4632  * @fires remove
4633  */
4634 OO.ui.TagItemWidget.prototype.remove = function () {
4635         if ( !this.isDisabled() ) {
4636                 this.emit( 'remove' );
4637         }
4638 };
4639
4640 /**
4641  * Handle a keydown event on the widget
4642  *
4643  * @fires navigate
4644  * @fires remove
4645  * @param {jQuery.Event} e Key down event
4646  * @return {boolean|undefined} false to stop the operation
4647  */
4648 OO.ui.TagItemWidget.prototype.onKeyDown = function ( e ) {
4649         var movement;
4650
4651         if ( !this.isDisabled() && e.keyCode === OO.ui.Keys.BACKSPACE || e.keyCode === OO.ui.Keys.DELETE ) {
4652                 this.remove();
4653                 return false;
4654         } else if ( e.keyCode === OO.ui.Keys.ENTER ) {
4655                 this.select();
4656                 return false;
4657         } else if (
4658                 e.keyCode === OO.ui.Keys.LEFT ||
4659                 e.keyCode === OO.ui.Keys.RIGHT
4660         ) {
4661                 if ( OO.ui.Element.static.getDir( this.$element ) === 'rtl' ) {
4662                         movement = {
4663                                 left: 'forwards',
4664                                 right: 'backwards'
4665                         };
4666                 } else {
4667                         movement = {
4668                                 left: 'backwards',
4669                                 right: 'forwards'
4670                         };
4671                 }
4672
4673                 this.emit(
4674                         'navigate',
4675                         e.keyCode === OO.ui.Keys.LEFT ?
4676                                 movement.left : movement.right
4677                 );
4678         }
4679 };
4680
4681 /**
4682  * Select this item
4683  *
4684  * @fires select
4685  */
4686 OO.ui.TagItemWidget.prototype.select = function () {
4687         if ( !this.isDisabled() ) {
4688                 this.emit( 'select' );
4689         }
4690 };
4691
4692 /**
4693  * Set the valid state of this item
4694  *
4695  * @param {boolean} [valid] Item is valid
4696  * @fires valid
4697  */
4698 OO.ui.TagItemWidget.prototype.toggleValid = function ( valid ) {
4699         valid = valid === undefined ? !this.valid : !!valid;
4700
4701         if ( this.valid !== valid ) {
4702                 this.valid = valid;
4703
4704                 this.setFlags( { invalid: !this.valid } );
4705
4706                 this.emit( 'valid', this.valid );
4707         }
4708 };
4709
4710 /**
4711  * Check whether the item is valid
4712  *
4713  * @return {boolean} Item is valid
4714  */
4715 OO.ui.TagItemWidget.prototype.isValid = function () {
4716         return this.valid;
4717 };
4718
4719 /**
4720  * A basic tag multiselect widget, similar in concept to {@link OO.ui.ComboBoxInputWidget combo box widget}
4721  * that allows the user to add multiple values that are displayed in a tag area.
4722  *
4723  * This widget is a base widget; see {@link OO.ui.MenuTagMultiselectWidget MenuTagMultiselectWidget} and
4724  * {@link OO.ui.PopupTagMultiselectWidget PopupTagMultiselectWidget} for the implementations that use
4725  * a menu and a popup respectively.
4726  *
4727  *     @example
4728  *     // Example: A basic TagMultiselectWidget.
4729  *     var widget = new OO.ui.TagMultiselectWidget( {
4730  *         inputPosition: 'outline',
4731  *         allowedValues: [ 'Option 1', 'Option 2', 'Option 3' ],
4732  *         selected: [ 'Option 1' ]
4733  *     } );
4734  *     $( 'body' ).append( widget.$element );
4735  *
4736  * @class
4737  * @extends OO.ui.Widget
4738  * @mixins OO.ui.mixin.GroupWidget
4739  * @mixins OO.ui.mixin.DraggableGroupElement
4740  * @mixins OO.ui.mixin.IndicatorElement
4741  * @mixins OO.ui.mixin.IconElement
4742  * @mixins OO.ui.mixin.TabIndexedElement
4743  * @mixins OO.ui.mixin.FlaggedElement
4744  *
4745  * @constructor
4746  * @param {Object} config Configuration object
4747  * @cfg {Object} [input] Configuration options for the input widget
4748  * @cfg {OO.ui.InputWidget} [inputWidget] An optional input widget. If given, it will
4749  *  replace the input widget used in the TagMultiselectWidget. If not given,
4750  *  TagMultiselectWidget creates its own.
4751  * @cfg {boolean} [inputPosition='inline'] Position of the input. Options are:
4752  *      - inline: The input is invisible, but exists inside the tag list, so
4753  *              the user types into the tag groups to add tags.
4754  *      - outline: The input is underneath the tag area.
4755  *      - none: No input supplied
4756  * @cfg {boolean} [allowEditTags=true] Allow editing of the tags by clicking them
4757  * @cfg {boolean} [allowArbitrary=false] Allow data items to be added even if
4758  *  not present in the menu.
4759  * @cfg {Object[]} [allowedValues] An array representing the allowed items
4760  *  by their datas.
4761  * @cfg {boolean} [allowDuplicates=false] Allow duplicate items to be added
4762  * @cfg {boolean} [allowDisplayInvalidTags=false] Allow the display of
4763  *  invalid tags. These tags will display with an invalid state, and
4764  *  the widget as a whole will have an invalid state if any invalid tags
4765  *  are present.
4766  * @cfg {boolean} [allowReordering=true] Allow reordering of the items
4767  * @cfg {Object[]|String[]} [selected] A set of selected tags. If given,
4768  *  these will appear in the tag list on initialization, as long as they
4769  *  pass the validity tests.
4770  */
4771 OO.ui.TagMultiselectWidget = function OoUiTagMultiselectWidget( config ) {
4772         var inputEvents,
4773                 rAF = window.requestAnimationFrame || setTimeout,
4774                 widget = this,
4775                 $tabFocus = $( '<span>' )
4776                         .addClass( 'oo-ui-tagMultiselectWidget-focusTrap' );
4777
4778         config = config || {};
4779
4780         // Parent constructor
4781         OO.ui.TagMultiselectWidget.parent.call( this, config );
4782
4783         // Mixin constructors
4784         OO.ui.mixin.GroupWidget.call( this, config );
4785         OO.ui.mixin.IndicatorElement.call( this, config );
4786         OO.ui.mixin.IconElement.call( this, config );
4787         OO.ui.mixin.TabIndexedElement.call( this, config );
4788         OO.ui.mixin.FlaggedElement.call( this, config );
4789         OO.ui.mixin.DraggableGroupElement.call( this, config );
4790
4791         this.toggleDraggable(
4792                 config.allowReordering === undefined ?
4793                         true : !!config.allowReordering
4794         );
4795
4796         this.inputPosition =
4797                 this.constructor.static.allowedInputPositions.indexOf( config.inputPosition ) > -1 ?
4798                         config.inputPosition : 'inline';
4799         this.allowEditTags = config.allowEditTags === undefined ? true : !!config.allowEditTags;
4800         this.allowArbitrary = !!config.allowArbitrary;
4801         this.allowDuplicates = !!config.allowDuplicates;
4802         this.allowedValues = config.allowedValues || [];
4803         this.allowDisplayInvalidTags = config.allowDisplayInvalidTags;
4804         this.hasInput = this.inputPosition !== 'none';
4805         this.height = null;
4806         this.valid = true;
4807
4808         this.$content = $( '<div>' )
4809                 .addClass( 'oo-ui-tagMultiselectWidget-content' );
4810         this.$handle = $( '<div>' )
4811                 .addClass( 'oo-ui-tagMultiselectWidget-handle' )
4812                 .append(
4813                         this.$indicator,
4814                         this.$icon,
4815                         this.$content
4816                                 .append(
4817                                         this.$group
4818                                                 .addClass( 'oo-ui-tagMultiselectWidget-group' )
4819                                 )
4820                 );
4821
4822         // Events
4823         this.aggregate( {
4824                 remove: 'itemRemove',
4825                 navigate: 'itemNavigate',
4826                 select: 'itemSelect',
4827                 disabled: 'itemDisabled'
4828         } );
4829         this.connect( this, {
4830                 itemRemove: 'onTagRemove',
4831                 itemSelect: 'onTagSelect',
4832                 itemDisabled: 'onTagDisabled',
4833                 itemNavigate: 'onTagNavigate',
4834                 change: 'onChangeTags'
4835         } );
4836         this.$handle.on( {
4837                 mousedown: this.onMouseDown.bind( this )
4838         } );
4839
4840         // Initialize
4841         this.$element
4842                 .addClass( 'oo-ui-tagMultiselectWidget' )
4843                 .append( this.$handle );
4844
4845         if ( this.hasInput ) {
4846                 if ( config.inputWidget ) {
4847                         this.input = config.inputWidget;
4848                 } else {
4849                         this.input = new OO.ui.TextInputWidget( $.extend( {
4850                                 placeholder: config.placeholder,
4851                                 classes: [ 'oo-ui-tagMultiselectWidget-input' ]
4852                         }, config.input ) );
4853                 }
4854                 this.input.setDisabled( this.isDisabled() );
4855
4856                 inputEvents = {
4857                         focus: this.onInputFocus.bind( this ),
4858                         blur: this.onInputBlur.bind( this ),
4859                         'propertychange change click mouseup keydown keyup input cut paste select focus':
4860                                 OO.ui.debounce( this.updateInputSize.bind( this ) ),
4861                         keydown: this.onInputKeyDown.bind( this ),
4862                         keypress: this.onInputKeyPress.bind( this )
4863                 };
4864
4865                 this.input.$input.on( inputEvents );
4866
4867                 if ( this.inputPosition === 'outline' ) {
4868                         // Override max-height for the input widget
4869                         // in the case the widget is outline so it can
4870                         // stretch all the way if the widet is wide
4871                         this.input.$element.css( 'max-width', 'inherit' );
4872                         this.$element
4873                                 .addClass( 'oo-ui-tagMultiselectWidget-outlined' )
4874                                 .append( this.input.$element );
4875                 } else {
4876                         this.$element.addClass( 'oo-ui-tagMultiselectWidget-inlined' );
4877                         // HACK: When the widget is using 'inline' input, the
4878                         // behavior needs to only use the $input itself
4879                         // so we style and size it accordingly (otherwise
4880                         // the styling and sizing can get very convoluted
4881                         // when the wrapping divs and other elements)
4882                         // We are taking advantage of still being able to
4883                         // call the widget itself for operations like
4884                         // .getValue() and setDisabled() and .focus() but
4885                         // having only the $input attached to the DOM
4886                         this.$content.append( this.input.$input );
4887                 }
4888         } else {
4889                 this.$content.append( $tabFocus );
4890         }
4891
4892         this.setTabIndexedElement(
4893                 this.hasInput ?
4894                         this.input.$input :
4895                         $tabFocus
4896         );
4897
4898         if ( config.selected ) {
4899                 this.setValue( config.selected );
4900         }
4901
4902         // HACK: Input size needs to be calculated after everything
4903         // else is rendered
4904         rAF( function () {
4905                 if ( widget.hasInput ) {
4906                         widget.updateInputSize();
4907                 }
4908         } );
4909 };
4910
4911 /* Initialization */
4912
4913 OO.inheritClass( OO.ui.TagMultiselectWidget, OO.ui.Widget );
4914 OO.mixinClass( OO.ui.TagMultiselectWidget, OO.ui.mixin.GroupWidget );
4915 OO.mixinClass( OO.ui.TagMultiselectWidget, OO.ui.mixin.DraggableGroupElement );
4916 OO.mixinClass( OO.ui.TagMultiselectWidget, OO.ui.mixin.IndicatorElement );
4917 OO.mixinClass( OO.ui.TagMultiselectWidget, OO.ui.mixin.IconElement );
4918 OO.mixinClass( OO.ui.TagMultiselectWidget, OO.ui.mixin.TabIndexedElement );
4919 OO.mixinClass( OO.ui.TagMultiselectWidget, OO.ui.mixin.FlaggedElement );
4920
4921 /* Static properties */
4922
4923 /**
4924  * Allowed input positions.
4925  * - inline: The input is inside the tag list
4926  * - outline: The input is under the tag list
4927  * - none: There is no input
4928  *
4929  * @property {Array}
4930  */
4931 OO.ui.TagMultiselectWidget.static.allowedInputPositions = [ 'inline', 'outline', 'none' ];
4932
4933 /* Methods */
4934
4935 /**
4936  * Handle mouse down events.
4937  *
4938  * @private
4939  * @param {jQuery.Event} e Mouse down event
4940  * @return {boolean} False to prevent defaults
4941  */
4942 OO.ui.TagMultiselectWidget.prototype.onMouseDown = function ( e ) {
4943         if (
4944                 !this.isDisabled() &&
4945                 ( !this.hasInput || e.target !== this.input.$input[ 0 ] ) &&
4946                 e.which === OO.ui.MouseButtons.LEFT
4947         ) {
4948                 this.focus();
4949                 return false;
4950         }
4951 };
4952
4953 /**
4954  * Handle key press events.
4955  *
4956  * @private
4957  * @param {jQuery.Event} e Key press event
4958  * @return {boolean} Whether to prevent defaults
4959  */
4960 OO.ui.TagMultiselectWidget.prototype.onInputKeyPress = function ( e ) {
4961         var stopOrContinue,
4962                 withMetaKey = e.metaKey || e.ctrlKey;
4963
4964         if ( !this.isDisabled() ) {
4965                 if ( e.which === OO.ui.Keys.ENTER ) {
4966                         stopOrContinue = this.doInputEnter( e, withMetaKey );
4967                 }
4968
4969                 // Make sure the input gets resized.
4970                 setTimeout( this.updateInputSize.bind( this ), 0 );
4971                 return stopOrContinue;
4972         }
4973 };
4974
4975 /**
4976  * Handle key down events.
4977  *
4978  * @private
4979  * @param {jQuery.Event} e Key down event
4980  * @return {boolean}
4981  */
4982 OO.ui.TagMultiselectWidget.prototype.onInputKeyDown = function ( e ) {
4983         var movement, direction,
4984                 withMetaKey = e.metaKey || e.ctrlKey;
4985
4986         if ( !this.isDisabled() ) {
4987                 // 'keypress' event is not triggered for Backspace
4988                 if ( e.keyCode === OO.ui.Keys.BACKSPACE ) {
4989                         return this.doInputBackspace( e, withMetaKey );
4990                 } else if ( e.keyCode === OO.ui.Keys.ESCAPE ) {
4991                         return this.doInputEscape( e );
4992                 } else if (
4993                         e.keyCode === OO.ui.Keys.LEFT ||
4994                         e.keyCode === OO.ui.Keys.RIGHT
4995                 ) {
4996                         if ( OO.ui.Element.static.getDir( this.$element ) === 'rtl' ) {
4997                                 movement = {
4998                                         left: 'forwards',
4999                                         right: 'backwards'
5000                                 };
5001                         } else {
5002                                 movement = {
5003                                         left: 'backwards',
5004                                         right: 'forwards'
5005                                 };
5006                         }
5007                         direction = e.keyCode === OO.ui.Keys.LEFT ?
5008                                 movement.left : movement.right;
5009
5010                         return this.doInputArrow( e, direction, withMetaKey );
5011                 }
5012         }
5013 };
5014
5015 /**
5016  * Respond to input focus event
5017  */
5018 OO.ui.TagMultiselectWidget.prototype.onInputFocus = function () {
5019         this.$element.addClass( 'oo-ui-tagMultiselectWidget-focus' );
5020 };
5021
5022 /**
5023  * Respond to input blur event
5024  */
5025 OO.ui.TagMultiselectWidget.prototype.onInputBlur = function () {
5026         this.$element.removeClass( 'oo-ui-tagMultiselectWidget-focus' );
5027 };
5028
5029 /**
5030  * Perform an action after the enter key on the input
5031  *
5032  * @param {jQuery.Event} e Event data
5033  * @param {boolean} [withMetaKey] Whether this key was pressed with
5034  * a meta key like 'ctrl'
5035  * @return {boolean} Whether to prevent defaults
5036  */
5037 OO.ui.TagMultiselectWidget.prototype.doInputEnter = function () {
5038         this.addTagFromInput();
5039         return false;
5040 };
5041
5042 /**
5043  * Perform an action responding to the enter key on the input
5044  *
5045  * @param {jQuery.Event} e Event data
5046  * @param {boolean} [withMetaKey] Whether this key was pressed with
5047  * a meta key like 'ctrl'
5048  * @return {boolean} Whether to prevent defaults
5049  */
5050 OO.ui.TagMultiselectWidget.prototype.doInputBackspace = function ( e, withMetaKey ) {
5051         var items, item;
5052
5053         if (
5054                 this.inputPosition === 'inline' &&
5055                 this.input.getValue() === '' &&
5056                 !this.isEmpty()
5057         ) {
5058                 // Delete the last item
5059                 items = this.getItems();
5060                 item = items[ items.length - 1 ];
5061
5062                 if ( !item.isDisabled() ) {
5063                         this.removeItems( [ item ] );
5064                         // If Ctrl/Cmd was pressed, delete item entirely.
5065                         // Otherwise put it into the text field for editing.
5066                         if ( !withMetaKey ) {
5067                                 this.input.setValue( item.getData() );
5068                         }
5069                 }
5070
5071                 return false;
5072         }
5073 };
5074
5075 /**
5076  * Perform an action after the escape key on the input
5077  *
5078  * @param {jQuery.Event} e Event data
5079  */
5080 OO.ui.TagMultiselectWidget.prototype.doInputEscape = function () {
5081         this.clearInput();
5082 };
5083
5084 /**
5085  * Perform an action after the arrow key on the input, select the previous
5086  * or next item from the input.
5087  * See #getPreviousItem and #getNextItem
5088  *
5089  * @param {jQuery.Event} e Event data
5090  * @param {string} direction Direction of the movement; forwards or backwards
5091  * @param {boolean} [withMetaKey] Whether this key was pressed with
5092  *  a meta key like 'ctrl'
5093  */
5094 OO.ui.TagMultiselectWidget.prototype.doInputArrow = function ( e, direction ) {
5095         if (
5096                 this.inputPosition === 'inline' &&
5097                 !this.isEmpty()
5098         ) {
5099                 if ( direction === 'backwards' ) {
5100                         // Get previous item
5101                         this.getPreviousItem().focus();
5102                 } else {
5103                         // Get next item
5104                         this.getNextItem().focus();
5105                 }
5106         }
5107 };
5108
5109 /**
5110  * Respond to item select event
5111  *
5112  * @param {OO.ui.TagItemWidget} item Selected item
5113  */
5114 OO.ui.TagMultiselectWidget.prototype.onTagSelect = function ( item ) {
5115         if ( this.hasInput && this.allowEditTags ) {
5116                 if ( this.input.getValue() ) {
5117                         this.addTagFromInput();
5118                 }
5119                 // 1. Get the label of the tag into the input
5120                 this.input.setValue( item.getData() );
5121                 // 2. Remove the tag
5122                 this.removeItems( [ item ] );
5123                 // 3. Focus the input
5124                 this.focus();
5125         }
5126 };
5127
5128 /**
5129  * Respond to item disabled state change
5130  *
5131  * @param {OO.ui.TagItemWidget} item Selected item
5132  * @param {boolean} isDisabled Item is disabled
5133  */
5134 OO.ui.TagMultiselectWidget.prototype.onTagDisabled = function ( item, isDisabled ) {
5135         if ( isDisabled ) {
5136         // Move item to start if it is disabled
5137                 this.addItems( item, 0 );
5138         }
5139 };
5140 /**
5141  * Respond to change event, where items were added, removed, or cleared.
5142  */
5143 OO.ui.TagMultiselectWidget.prototype.onChangeTags = function () {
5144         this.toggleValid( this.checkValidity() );
5145         if ( this.hasInput ) {
5146                 this.updateInputSize();
5147         }
5148         this.updateIfHeightChanged();
5149 };
5150
5151 /**
5152  * @inheritdoc
5153  */
5154 OO.ui.TagMultiselectWidget.prototype.setDisabled = function ( isDisabled ) {
5155         // Parent method
5156         OO.ui.TagMultiselectWidget.parent.prototype.setDisabled.call( this, isDisabled );
5157
5158         if ( this.hasInput && this.input ) {
5159                 this.input.setDisabled( !!isDisabled );
5160         }
5161
5162         if ( this.items ) {
5163                 this.getItems().forEach( function ( item ) {
5164                         item.setDisabled( !!isDisabled );
5165                 } );
5166         }
5167 };
5168
5169 /**
5170  * Respond to tag remove event
5171  * @param {OO.ui.TagItemWidget} item Removed tag
5172  */
5173 OO.ui.TagMultiselectWidget.prototype.onTagRemove = function ( item ) {
5174         this.removeTagByData( item.getData() );
5175 };
5176
5177 /**
5178  * Respond to navigate event on the tag
5179  *
5180  * @param {OO.ui.TagItemWidget} item Removed tag
5181  * @param {string} direction Direction of movement; 'forwards' or 'backwards'
5182  */
5183 OO.ui.TagMultiselectWidget.prototype.onTagNavigate = function ( item, direction ) {
5184         if ( direction === 'forwards' ) {
5185                 this.getNextItem( item ).focus();
5186         } else {
5187                 this.getPreviousItem( item ).focus();
5188         }
5189 };
5190
5191 /**
5192  * Add tag from input value
5193  */
5194 OO.ui.TagMultiselectWidget.prototype.addTagFromInput = function () {
5195         var val = this.input.getValue(),
5196                 isValid = this.isAllowedData( val );
5197
5198         if ( !val ) {
5199                 return;
5200         }
5201
5202         if ( isValid || this.allowDisplayInvalidTags ) {
5203                 this.addTag( val );
5204                 this.clearInput();
5205                 this.focus();
5206         }
5207 };
5208
5209 /**
5210  * Clear the input
5211  */
5212 OO.ui.TagMultiselectWidget.prototype.clearInput = function () {
5213         this.input.setValue( '' );
5214 };
5215
5216 /**
5217  * Check whether the given value is a duplicate of an existing
5218  * tag already in the list.
5219  *
5220  * @param {string|Object} data Requested value
5221  * @return {boolean} Value is duplicate
5222  */
5223 OO.ui.TagMultiselectWidget.prototype.isDuplicateData = function ( data ) {
5224         return !!this.findItemFromData( data );
5225 };
5226
5227 /**
5228  * Check whether a given value is allowed to be added
5229  *
5230  * @param {string|Object} data Requested value
5231  * @return {boolean} Value is allowed
5232  */
5233 OO.ui.TagMultiselectWidget.prototype.isAllowedData = function ( data ) {
5234         if (
5235                 !this.allowDuplicates &&
5236                 this.isDuplicateData( data )
5237         ) {
5238                 return false;
5239         }
5240
5241         if ( this.allowArbitrary ) {
5242                 return true;
5243         }
5244
5245         // Check with allowed values
5246         if (
5247                 this.getAllowedValues().some( function ( value ) {
5248                         return data === value;
5249                 } )
5250         ) {
5251                 return true;
5252         }
5253
5254         return false;
5255 };
5256
5257 /**
5258  * Get the allowed values list
5259  *
5260  * @return {string[]} Allowed data values
5261  */
5262 OO.ui.TagMultiselectWidget.prototype.getAllowedValues = function () {
5263         return this.allowedValues;
5264 };
5265
5266 /**
5267  * Add a value to the allowed values list
5268  *
5269  * @param {string} value Allowed data value
5270  */
5271 OO.ui.TagMultiselectWidget.prototype.addAllowedValue = function ( value ) {
5272         if ( this.allowedValues.indexOf( value ) === -1 ) {
5273                 this.allowedValues.push( value );
5274         }
5275 };
5276
5277 /**
5278  * Get the datas of the currently selected items
5279  *
5280  * @return {string[]|Object[]} Datas of currently selected items
5281  */
5282 OO.ui.TagMultiselectWidget.prototype.getValue = function () {
5283         return this.getItems()
5284                 .filter( function ( item ) {
5285                         return item.isValid();
5286                 } )
5287                 .map( function ( item ) {
5288                         return item.getData();
5289                 } );
5290 };
5291
5292 /**
5293  * Set the value of this widget by datas.
5294  *
5295  * @param {string|string[]|Object|Object[]} valueObject An object representing the data
5296  *  and label of the value. If the widget allows arbitrary values,
5297  *  the items will be added as-is. Otherwise, the data value will
5298  *  be checked against allowedValues.
5299  *  This object must contain at least a data key. Example:
5300  *  { data: 'foo', label: 'Foo item' }
5301  *  For multiple items, use an array of objects. For example:
5302  *   [
5303  *      { data: 'foo', label: 'Foo item' },
5304  *      { data: 'bar', label: 'Bar item' }
5305  *       ]
5306  *  Value can also be added with plaintext array, for example:
5307  *  [ 'foo', 'bar', 'bla' ] or a single string, like 'foo'
5308  */
5309 OO.ui.TagMultiselectWidget.prototype.setValue = function ( valueObject ) {
5310         valueObject = Array.isArray( valueObject ) ? valueObject : [ valueObject ];
5311
5312         this.clearItems();
5313         valueObject.forEach( function ( obj ) {
5314                 if ( typeof obj === 'string' ) {
5315                         this.addTag( obj );
5316                 } else {
5317                         this.addTag( obj.data, obj.label );
5318                 }
5319         }.bind( this ) );
5320 };
5321
5322 /**
5323  * Add tag to the display area
5324  *
5325  * @param {string|Object} data Tag data
5326  * @param {string} [label] Tag label. If no label is provided, the
5327  *  stringified version of the data will be used instead.
5328  * @return {boolean} Item was added successfully
5329  */
5330 OO.ui.TagMultiselectWidget.prototype.addTag = function ( data, label ) {
5331         var newItemWidget,
5332                 isValid = this.isAllowedData( data );
5333
5334         if ( isValid || this.allowDisplayInvalidTags ) {
5335                 newItemWidget = this.createTagItemWidget( data, label );
5336                 newItemWidget.toggleValid( isValid );
5337                 this.addItems( [ newItemWidget ] );
5338                 return true;
5339         }
5340         return false;
5341 };
5342
5343 /**
5344  * Remove tag by its data property.
5345  *
5346  * @param {string|Object} data Tag data
5347  */
5348 OO.ui.TagMultiselectWidget.prototype.removeTagByData = function ( data ) {
5349         var item = this.findItemFromData( data );
5350
5351         this.removeItems( [ item ] );
5352 };
5353
5354 /**
5355  * Construct a OO.ui.TagItemWidget (or a subclass thereof) from given label and data.
5356  *
5357  * @protected
5358  * @param {string} data Item data
5359  * @param {string} label The label text.
5360  * @return {OO.ui.TagItemWidget}
5361  */
5362 OO.ui.TagMultiselectWidget.prototype.createTagItemWidget = function ( data, label ) {
5363         label = label || data;
5364
5365         return new OO.ui.TagItemWidget( { data: data, label: label } );
5366 };
5367
5368 /**
5369  * Given an item, returns the item after it. If the item is already the
5370  * last item, return `this.input`. If no item is passed, returns the
5371  * very first item.
5372  *
5373  * @protected
5374  * @param {OO.ui.TagItemWidget} [item] Tag item
5375  * @return {OO.ui.Widget} The next widget available.
5376  */
5377 OO.ui.TagMultiselectWidget.prototype.getNextItem = function ( item ) {
5378         var itemIndex = this.items.indexOf( item );
5379
5380         if ( item === undefined || itemIndex === -1 ) {
5381                 return this.items[ 0 ];
5382         }
5383
5384         if ( itemIndex === this.items.length - 1 ) { // Last item
5385                 if ( this.hasInput ) {
5386                         return this.input;
5387                 } else {
5388                         // Return first item
5389                         return this.items[ 0 ];
5390                 }
5391         } else {
5392                 return this.items[ itemIndex + 1 ];
5393         }
5394 };
5395
5396 /**
5397  * Given an item, returns the item before it. If the item is already the
5398  * first item, return `this.input`. If no item is passed, returns the
5399  * very last item.
5400  *
5401  * @protected
5402  * @param {OO.ui.TagItemWidget} [item] Tag item
5403  * @return {OO.ui.Widget} The previous widget available.
5404  */
5405 OO.ui.TagMultiselectWidget.prototype.getPreviousItem = function ( item ) {
5406         var itemIndex = this.items.indexOf( item );
5407
5408         if ( item === undefined || itemIndex === -1 ) {
5409                 return this.items[ this.items.length - 1 ];
5410         }
5411
5412         if ( itemIndex === 0 ) {
5413                 if ( this.hasInput ) {
5414                         return this.input;
5415                 } else {
5416                         // Return the last item
5417                         return this.items[ this.items.length - 1 ];
5418                 }
5419         } else {
5420                 return this.items[ itemIndex - 1 ];
5421         }
5422 };
5423
5424 /**
5425  * Update the dimensions of the text input field to encompass all available area.
5426  * This is especially relevant for when the input is at the edge of a line
5427  * and should get smaller. The usual operation (as an inline-block with min-width)
5428  * does not work in that case, pushing the input downwards to the next line.
5429  *
5430  * @private
5431  */
5432 OO.ui.TagMultiselectWidget.prototype.updateInputSize = function () {
5433         var $lastItem, direction, contentWidth, currentWidth, bestWidth;
5434         if ( this.inputPosition === 'inline' && !this.isDisabled() ) {
5435                 if ( this.input.$input[ 0 ].scrollWidth === 0 ) {
5436                         // Input appears to be attached but not visible.
5437                         // Don't attempt to adjust its size, because our measurements
5438                         // are going to fail anyway.
5439                         return;
5440                 }
5441                 this.input.$input.css( 'width', '1em' );
5442                 $lastItem = this.$group.children().last();
5443                 direction = OO.ui.Element.static.getDir( this.$handle );
5444
5445                 // Get the width of the input with the placeholder text as
5446                 // the value and save it so that we don't keep recalculating
5447                 if (
5448                         this.contentWidthWithPlaceholder === undefined &&
5449                         this.input.getValue() === '' &&
5450                         this.input.$input.attr( 'placeholder' ) !== undefined
5451                 ) {
5452                         this.input.setValue( this.input.$input.attr( 'placeholder' ) );
5453                         this.contentWidthWithPlaceholder = this.input.$input[ 0 ].scrollWidth;
5454                         this.input.setValue( '' );
5455
5456                 }
5457
5458                 // Always keep the input wide enough for the placeholder text
5459                 contentWidth = Math.max(
5460                         this.input.$input[ 0 ].scrollWidth,
5461                         // undefined arguments in Math.max lead to NaN
5462                         ( this.contentWidthWithPlaceholder === undefined ) ?
5463                                 0 : this.contentWidthWithPlaceholder
5464                 );
5465                 currentWidth = this.input.$input.width();
5466
5467                 if ( contentWidth < currentWidth ) {
5468                         this.updateIfHeightChanged();
5469                         // All is fine, don't perform expensive calculations
5470                         return;
5471                 }
5472
5473                 if ( $lastItem.length === 0 ) {
5474                         bestWidth = this.$content.innerWidth();
5475                 } else {
5476                         bestWidth = direction === 'ltr' ?
5477                                 this.$content.innerWidth() - $lastItem.position().left - $lastItem.outerWidth() :
5478                                 $lastItem.position().left;
5479                 }
5480
5481                 // Some safety margin for sanity, because I *really* don't feel like finding out where the few
5482                 // pixels this is off by are coming from.
5483                 bestWidth -= 10;
5484                 if ( contentWidth > bestWidth ) {
5485                         // This will result in the input getting shifted to the next line
5486                         bestWidth = this.$content.innerWidth() - 10;
5487                 }
5488                 this.input.$input.width( Math.floor( bestWidth ) );
5489                 this.updateIfHeightChanged();
5490         } else {
5491                 this.updateIfHeightChanged();
5492         }
5493 };
5494
5495 /**
5496  * Determine if widget height changed, and if so,
5497  * emit the resize event. This is useful for when there are either
5498  * menus or popups attached to the bottom of the widget, to allow
5499  * them to change their positioning in case the widget moved down
5500  * or up.
5501  *
5502  * @private
5503  */
5504 OO.ui.TagMultiselectWidget.prototype.updateIfHeightChanged = function () {
5505         var height = this.$element.height();
5506         if ( height !== this.height ) {
5507                 this.height = height;
5508                 this.emit( 'resize' );
5509         }
5510 };
5511
5512 /**
5513  * Check whether all items in the widget are valid
5514  *
5515  * @return {boolean} Widget is valid
5516  */
5517 OO.ui.TagMultiselectWidget.prototype.checkValidity = function () {
5518         return this.getItems().every( function ( item ) {
5519                 return item.isValid();
5520         } );
5521 };
5522
5523 /**
5524  * Set the valid state of this item
5525  *
5526  * @param {boolean} [valid] Item is valid
5527  * @fires valid
5528  */
5529 OO.ui.TagMultiselectWidget.prototype.toggleValid = function ( valid ) {
5530         valid = valid === undefined ? !this.valid : !!valid;
5531
5532         if ( this.valid !== valid ) {
5533                 this.valid = valid;
5534
5535                 this.setFlags( { invalid: !this.valid } );
5536
5537                 this.emit( 'valid', this.valid );
5538         }
5539 };
5540
5541 /**
5542  * Get the current valid state of the widget
5543  *
5544  * @return {boolean} Widget is valid
5545  */
5546 OO.ui.TagMultiselectWidget.prototype.isValid = function () {
5547         return this.valid;
5548 };
5549
5550 /**
5551  * PopupTagMultiselectWidget is a {@link OO.ui.TagMultiselectWidget OO.ui.TagMultiselectWidget} intended
5552  * to use a popup. The popup can be configured to have a default input to insert values into the widget.
5553  *
5554  *     @example
5555  *     // Example: A basic PopupTagMultiselectWidget.
5556  *     var widget = new OO.ui.PopupTagMultiselectWidget();
5557  *     $( 'body' ).append( widget.$element );
5558  *
5559  *     // Example: A PopupTagMultiselectWidget with an external popup.
5560  *     var popupInput = new OO.ui.TextInputWidget(),
5561  *         widget = new OO.ui.PopupTagMultiselectWidget( {
5562  *            popupInput: popupInput,
5563  *            popup: {
5564  *               $content: popupInput.$element
5565  *            }
5566  *         } );
5567  *     $( 'body' ).append( widget.$element );
5568  *
5569  * @class
5570  * @extends OO.ui.TagMultiselectWidget
5571  * @mixins OO.ui.mixin.PopupElement
5572  *
5573  * @param {Object} config Configuration object
5574  * @cfg {jQuery} [$overlay] An overlay for the popup.
5575  *  See <https://www.mediawiki.org/wiki/OOUI/Concepts#Overlays>.
5576  * @cfg {Object} [popup] Configuration options for the popup
5577  * @cfg {OO.ui.InputWidget} [popupInput] An input widget inside the popup that will be
5578  *  focused when the popup is opened and will be used as replacement for the
5579  *  general input in the widget.
5580  */
5581 OO.ui.PopupTagMultiselectWidget = function OoUiPopupTagMultiselectWidget( config ) {
5582         var defaultInput,
5583                 defaultConfig = { popup: {} };
5584
5585         config = config || {};
5586
5587         // Parent constructor
5588         OO.ui.PopupTagMultiselectWidget.parent.call( this, $.extend( { inputPosition: 'none' }, config ) );
5589
5590         this.$overlay = ( config.$overlay === true ? OO.ui.getDefaultOverlay() : config.$overlay ) || this.$element;
5591
5592         if ( !config.popup ) {
5593                 // For the default base implementation, we give a popup
5594                 // with an input widget inside it. For any other use cases
5595                 // the popup needs to be populated externally and the
5596                 // event handled to add tags separately and manually
5597                 defaultInput = new OO.ui.TextInputWidget();
5598
5599                 defaultConfig.popupInput = defaultInput;
5600                 defaultConfig.popup.$content = defaultInput.$element;
5601
5602                 this.$element.addClass( 'oo-ui-popupTagMultiselectWidget-defaultPopup' );
5603         }
5604
5605         // Add overlay, and add that to the autoCloseIgnore
5606         defaultConfig.popup.$overlay = this.$overlay;
5607         defaultConfig.popup.$autoCloseIgnore = this.hasInput ?
5608                 this.input.$element.add( this.$overlay ) : this.$overlay;
5609
5610         // Allow extending any of the above
5611         config = $.extend( defaultConfig, config );
5612
5613         // Mixin constructors
5614         OO.ui.mixin.PopupElement.call( this, config );
5615
5616         if ( this.hasInput ) {
5617                 this.input.$input.on( 'focus', this.popup.toggle.bind( this.popup, true ) );
5618         }
5619
5620         // Configuration options
5621         this.popupInput = config.popupInput;
5622         if ( this.popupInput ) {
5623                 this.popupInput.connect( this, {
5624                         enter: 'onPopupInputEnter'
5625                 } );
5626         }
5627
5628         // Events
5629         this.on( 'resize', this.popup.updateDimensions.bind( this.popup ) );
5630         this.popup.connect( this, { toggle: 'onPopupToggle' } );
5631         this.$tabIndexed
5632                 .on( 'focus', this.onFocus.bind( this ) );
5633
5634         // Initialize
5635         this.$element
5636                 .append( this.popup.$element )
5637                 .addClass( 'oo-ui-popupTagMultiselectWidget' );
5638 };
5639
5640 /* Initialization */
5641
5642 OO.inheritClass( OO.ui.PopupTagMultiselectWidget, OO.ui.TagMultiselectWidget );
5643 OO.mixinClass( OO.ui.PopupTagMultiselectWidget, OO.ui.mixin.PopupElement );
5644
5645 /* Methods */
5646
5647 /**
5648  * Focus event handler.
5649  *
5650  * @private
5651  */
5652 OO.ui.PopupTagMultiselectWidget.prototype.onFocus = function () {
5653         this.popup.toggle( true );
5654 };
5655
5656 /**
5657  * Respond to popup toggle event
5658  *
5659  * @param {boolean} isVisible Popup is visible
5660  */
5661 OO.ui.PopupTagMultiselectWidget.prototype.onPopupToggle = function ( isVisible ) {
5662         if ( isVisible && this.popupInput ) {
5663                 this.popupInput.focus();
5664         }
5665 };
5666
5667 /**
5668  * Respond to popup input enter event
5669  */
5670 OO.ui.PopupTagMultiselectWidget.prototype.onPopupInputEnter = function () {
5671         if ( this.popupInput ) {
5672                 this.addTagByPopupValue( this.popupInput.getValue() );
5673                 this.popupInput.setValue( '' );
5674         }
5675 };
5676
5677 /**
5678  * @inheritdoc
5679  */
5680 OO.ui.PopupTagMultiselectWidget.prototype.onTagSelect = function ( item ) {
5681         if ( this.popupInput && this.allowEditTags ) {
5682                 this.popupInput.setValue( item.getData() );
5683                 this.removeItems( [ item ] );
5684
5685                 this.popup.toggle( true );
5686                 this.popupInput.focus();
5687         } else {
5688                 // Parent
5689                 OO.ui.PopupTagMultiselectWidget.parent.prototype.onTagSelect.call( this, item );
5690         }
5691 };
5692
5693 /**
5694  * Add a tag by the popup value.
5695  * Whatever is responsible for setting the value in the popup should call
5696  * this method to add a tag, or use the regular methods like #addTag or
5697  * #setValue directly.
5698  *
5699  * @param {string} data The value of item
5700  * @param {string} [label] The label of the tag. If not given, the data is used.
5701  */
5702 OO.ui.PopupTagMultiselectWidget.prototype.addTagByPopupValue = function ( data, label ) {
5703         this.addTag( data, label );
5704 };
5705
5706 /**
5707  * MenuTagMultiselectWidget is a {@link OO.ui.TagMultiselectWidget OO.ui.TagMultiselectWidget} intended
5708  * to use a menu of selectable options.
5709  *
5710  *     @example
5711  *     // Example: A basic MenuTagMultiselectWidget.
5712  *     var widget = new OO.ui.MenuTagMultiselectWidget( {
5713  *         inputPosition: 'outline',
5714  *         options: [
5715  *            { data: 'option1', label: 'Option 1' },
5716  *            { data: 'option2', label: 'Option 2' },
5717  *            { data: 'option3', label: 'Option 3' },
5718  *         ],
5719  *         selected: [ 'option1', 'option2' ]
5720  *     } );
5721  *     $( 'body' ).append( widget.$element );
5722  *
5723  * @class
5724  * @extends OO.ui.TagMultiselectWidget
5725  *
5726  * @constructor
5727  * @param {Object} [config] Configuration object
5728  * @cfg {boolean} [clearInputOnChoose=true] Clear the text input value when a menu option is chosen
5729  * @cfg {Object} [menu] Configuration object for the menu widget
5730  * @cfg {jQuery} [$overlay] An overlay for the menu.
5731  *  See <https://www.mediawiki.org/wiki/OOUI/Concepts#Overlays>.
5732  * @cfg {Object[]} [options=[]] Array of menu options in the format `{ data: …, label: … }`
5733  */
5734 OO.ui.MenuTagMultiselectWidget = function OoUiMenuTagMultiselectWidget( config ) {
5735         config = config || {};
5736
5737         // Parent constructor
5738         OO.ui.MenuTagMultiselectWidget.parent.call( this, config );
5739
5740         this.$overlay = ( config.$overlay === true ? OO.ui.getDefaultOverlay() : config.$overlay ) || this.$element;
5741         this.clearInputOnChoose = config.clearInputOnChoose === undefined || !!config.clearInputOnChoose;
5742         this.menu = this.createMenuWidget( $.extend( {
5743                 widget: this,
5744                 input: this.hasInput ? this.input : null,
5745                 $input: this.hasInput ? this.input.$input : null,
5746                 filterFromInput: !!this.hasInput,
5747                 $autoCloseIgnore: this.hasInput ?
5748                         this.input.$element : $( [] ),
5749                 $floatableContainer: this.hasInput && this.inputPosition === 'outline' ?
5750                         this.input.$element : this.$element,
5751                 $overlay: this.$overlay,
5752                 disabled: this.isDisabled()
5753         }, config.menu ) );
5754         this.addOptions( config.options || [] );
5755
5756         // Events
5757         this.menu.connect( this, {
5758                 choose: 'onMenuChoose',
5759                 toggle: 'onMenuToggle'
5760         } );
5761         if ( this.hasInput ) {
5762                 this.input.connect( this, { change: 'onInputChange' } );
5763         }
5764         this.connect( this, { resize: 'onResize' } );
5765
5766         // Initialization
5767         this.$overlay
5768                 .append( this.menu.$element );
5769         this.$element
5770                 .addClass( 'oo-ui-menuTagMultiselectWidget' );
5771         // TagMultiselectWidget already does this, but it doesn't work right because this.menu is not yet
5772         // set up while the parent constructor runs, and #getAllowedValues rejects everything.
5773         if ( config.selected ) {
5774                 this.setValue( config.selected );
5775         }
5776 };
5777
5778 /* Initialization */
5779
5780 OO.inheritClass( OO.ui.MenuTagMultiselectWidget, OO.ui.TagMultiselectWidget );
5781
5782 /* Methods */
5783
5784 /**
5785  * Respond to resize event
5786  */
5787 OO.ui.MenuTagMultiselectWidget.prototype.onResize = function () {
5788         // Reposition the menu
5789         this.menu.position();
5790 };
5791
5792 /**
5793  * @inheritdoc
5794  */
5795 OO.ui.MenuTagMultiselectWidget.prototype.onInputFocus = function () {
5796         // Parent method
5797         OO.ui.MenuTagMultiselectWidget.parent.prototype.onInputFocus.call( this );
5798
5799         this.menu.toggle( true );
5800 };
5801
5802 /**
5803  * Respond to input change event
5804  */
5805 OO.ui.MenuTagMultiselectWidget.prototype.onInputChange = function () {
5806         this.menu.toggle( true );
5807         this.initializeMenuSelection();
5808 };
5809
5810 /**
5811  * Respond to menu choose event
5812  *
5813  * @param {OO.ui.OptionWidget} menuItem Chosen menu item
5814  */
5815 OO.ui.MenuTagMultiselectWidget.prototype.onMenuChoose = function ( menuItem ) {
5816         // Add tag
5817         this.addTag( menuItem.getData(), menuItem.getLabel() );
5818         if ( this.hasInput && this.clearInputOnChoose ) {
5819                 this.input.setValue( '' );
5820         }
5821 };
5822
5823 /**
5824  * Respond to menu toggle event. Reset item highlights on hide.
5825  *
5826  * @param {boolean} isVisible The menu is visible
5827  */
5828 OO.ui.MenuTagMultiselectWidget.prototype.onMenuToggle = function ( isVisible ) {
5829         if ( !isVisible ) {
5830                 this.menu.selectItem( null );
5831                 this.menu.highlightItem( null );
5832         } else {
5833                 this.initializeMenuSelection();
5834         }
5835 };
5836
5837 /**
5838  * @inheritdoc
5839  */
5840 OO.ui.MenuTagMultiselectWidget.prototype.onTagSelect = function ( tagItem ) {
5841         var menuItem = this.menu.findItemFromData( tagItem.getData() );
5842         // Override the base behavior from TagMultiselectWidget; the base behavior
5843         // in TagMultiselectWidget is to remove the tag to edit it in the input,
5844         // but in our case, we want to utilize the menu selection behavior, and
5845         // definitely not remove the item.
5846
5847         // If there is an input that is used for filtering, erase the value so we don't filter
5848         if ( this.hasInput && this.menu.filterFromInput ) {
5849                 this.input.setValue( '' );
5850         }
5851
5852         // Select the menu item
5853         this.menu.selectItem( menuItem );
5854
5855         this.focus();
5856 };
5857
5858 /**
5859  * Highlight the first selectable item in the menu, if configured.
5860  *
5861  * @private
5862  * @chainable
5863  */
5864 OO.ui.MenuTagMultiselectWidget.prototype.initializeMenuSelection = function () {
5865         if ( !this.menu.findSelectedItem() ) {
5866                 this.menu.highlightItem( this.menu.findFirstSelectableItem() );
5867         }
5868 };
5869
5870 /**
5871  * @inheritdoc
5872  */
5873 OO.ui.MenuTagMultiselectWidget.prototype.addTagFromInput = function () {
5874         var inputValue = this.input.getValue(),
5875                 validated = false,
5876                 highlightedItem = this.menu.findHighlightedItem(),
5877                 item = this.menu.findItemFromData( inputValue );
5878
5879         if ( !inputValue ) {
5880                 return;
5881         }
5882
5883         // Override the parent method so we add from the menu
5884         // rather than directly from the input
5885
5886         // Look for a highlighted item first
5887         if ( highlightedItem ) {
5888                 validated = this.addTag( highlightedItem.getData(), highlightedItem.getLabel() );
5889         } else if ( item ) {
5890                 // Look for the element that fits the data
5891                 validated = this.addTag( item.getData(), item.getLabel() );
5892         } else {
5893                 // Otherwise, add the tag - the method will only add if the
5894                 // tag is valid or if invalid tags are allowed
5895                 validated = this.addTag( inputValue );
5896         }
5897
5898         if ( validated ) {
5899                 this.clearInput();
5900                 this.focus();
5901         }
5902 };
5903
5904 /**
5905  * Return the visible items in the menu. This is mainly used for when
5906  * the menu is filtering results.
5907  *
5908  * @return {OO.ui.MenuOptionWidget[]} Visible results
5909  */
5910 OO.ui.MenuTagMultiselectWidget.prototype.getMenuVisibleItems = function () {
5911         return this.menu.getItems().filter( function ( menuItem ) {
5912                 return menuItem.isVisible();
5913         } );
5914 };
5915
5916 /**
5917  * Create the menu for this widget. This is in a separate method so that
5918  * child classes can override this without polluting the constructor with
5919  * unnecessary extra objects that will be overidden.
5920  *
5921  * @param {Object} menuConfig Configuration options
5922  * @return {OO.ui.MenuSelectWidget} Menu widget
5923  */
5924 OO.ui.MenuTagMultiselectWidget.prototype.createMenuWidget = function ( menuConfig ) {
5925         return new OO.ui.MenuSelectWidget( menuConfig );
5926 };
5927
5928 /**
5929  * Add options to the menu
5930  *
5931  * @param {Object[]} menuOptions Object defining options
5932  */
5933 OO.ui.MenuTagMultiselectWidget.prototype.addOptions = function ( menuOptions ) {
5934         var widget = this,
5935                 items = menuOptions.map( function ( obj ) {
5936                         return widget.createMenuOptionWidget( obj.data, obj.label );
5937                 } );
5938
5939         this.menu.addItems( items );
5940 };
5941
5942 /**
5943  * Create a menu option widget.
5944  *
5945  * @param {string} data Item data
5946  * @param {string} [label] Item label
5947  * @return {OO.ui.OptionWidget} Option widget
5948  */
5949 OO.ui.MenuTagMultiselectWidget.prototype.createMenuOptionWidget = function ( data, label ) {
5950         return new OO.ui.MenuOptionWidget( {
5951                 data: data,
5952                 label: label || data
5953         } );
5954 };
5955
5956 /**
5957  * Get the menu
5958  *
5959  * @return {OO.ui.MenuSelectWidget} Menu
5960  */
5961 OO.ui.MenuTagMultiselectWidget.prototype.getMenu = function () {
5962         return this.menu;
5963 };
5964
5965 /**
5966  * Get the allowed values list
5967  *
5968  * @return {string[]} Allowed data values
5969  */
5970 OO.ui.MenuTagMultiselectWidget.prototype.getAllowedValues = function () {
5971         var menuDatas = [];
5972         if ( this.menu ) {
5973                 // If the parent constructor is calling us, we're not ready yet, this.menu is not set up.
5974                 menuDatas = this.menu.getItems().map( function ( menuItem ) {
5975                         return menuItem.getData();
5976                 } );
5977         }
5978         return this.allowedValues.concat( menuDatas );
5979 };
5980
5981 /**
5982  * SelectFileWidgets allow for selecting files, using the HTML5 File API. These
5983  * widgets can be configured with {@link OO.ui.mixin.IconElement icons} and {@link
5984  * OO.ui.mixin.IndicatorElement indicators}.
5985  * Please see the [OOUI documentation on MediaWiki] [1] for more information and examples.
5986  *
5987  *     @example
5988  *     // Example of a file select widget
5989  *     var selectFile = new OO.ui.SelectFileWidget();
5990  *     $( 'body' ).append( selectFile.$element );
5991  *
5992  * [1]: https://www.mediawiki.org/wiki/OOUI/Widgets
5993  *
5994  * @class
5995  * @extends OO.ui.Widget
5996  * @mixins OO.ui.mixin.IconElement
5997  * @mixins OO.ui.mixin.IndicatorElement
5998  * @mixins OO.ui.mixin.PendingElement
5999  * @mixins OO.ui.mixin.LabelElement
6000  *
6001  * @constructor
6002  * @param {Object} [config] Configuration options
6003  * @cfg {string[]|null} [accept=null] MIME types to accept. null accepts all types.
6004  * @cfg {string} [placeholder] Text to display when no file is selected.
6005  * @cfg {string} [notsupported] Text to display when file support is missing in the browser.
6006  * @cfg {boolean} [droppable=true] Whether to accept files by drag and drop.
6007  * @cfg {boolean} [showDropTarget=false] Whether to show a drop target. Requires droppable to be true.
6008  * @cfg {number} [thumbnailSizeLimit=20] File size limit in MiB above which to not try and show a
6009  *  preview (for performance)
6010  */
6011 OO.ui.SelectFileWidget = function OoUiSelectFileWidget( config ) {
6012         var dragHandler;
6013
6014         // Configuration initialization
6015         config = $.extend( {
6016                 accept: null,
6017                 placeholder: OO.ui.msg( 'ooui-selectfile-placeholder' ),
6018                 notsupported: OO.ui.msg( 'ooui-selectfile-not-supported' ),
6019                 droppable: true,
6020                 showDropTarget: false,
6021                 thumbnailSizeLimit: 20
6022         }, config );
6023
6024         // Parent constructor
6025         OO.ui.SelectFileWidget.parent.call( this, config );
6026
6027         // Mixin constructors
6028         OO.ui.mixin.IconElement.call( this, config );
6029         OO.ui.mixin.IndicatorElement.call( this, config );
6030         OO.ui.mixin.PendingElement.call( this, $.extend( {}, config, { $pending: this.$info } ) );
6031         OO.ui.mixin.LabelElement.call( this, config );
6032
6033         // Properties
6034         this.$info = $( '<span>' );
6035         this.showDropTarget = config.showDropTarget;
6036         this.thumbnailSizeLimit = config.thumbnailSizeLimit;
6037         this.isSupported = this.constructor.static.isSupported();
6038         this.currentFile = null;
6039         if ( Array.isArray( config.accept ) ) {
6040                 this.accept = config.accept;
6041         } else {
6042                 this.accept = null;
6043         }
6044         this.placeholder = config.placeholder;
6045         this.notsupported = config.notsupported;
6046         this.onFileSelectedHandler = this.onFileSelected.bind( this );
6047
6048         this.selectButton = new OO.ui.ButtonWidget( {
6049                 classes: [ 'oo-ui-selectFileWidget-selectButton' ],
6050                 label: OO.ui.msg( 'ooui-selectfile-button-select' ),
6051                 disabled: this.disabled || !this.isSupported
6052         } );
6053
6054         this.clearButton = new OO.ui.ButtonWidget( {
6055                 classes: [ 'oo-ui-selectFileWidget-clearButton' ],
6056                 framed: false,
6057                 icon: 'close',
6058                 disabled: this.disabled
6059         } );
6060
6061         // Events
6062         this.selectButton.$button.on( {
6063                 keypress: this.onKeyPress.bind( this )
6064         } );
6065         this.clearButton.connect( this, {
6066                 click: 'onClearClick'
6067         } );
6068         if ( config.droppable ) {
6069                 dragHandler = this.onDragEnterOrOver.bind( this );
6070                 this.$element.on( {
6071                         dragenter: dragHandler,
6072                         dragover: dragHandler,
6073                         dragleave: this.onDragLeave.bind( this ),
6074                         drop: this.onDrop.bind( this )
6075                 } );
6076         }
6077
6078         // Initialization
6079         this.addInput();
6080         this.$label.addClass( 'oo-ui-selectFileWidget-label' );
6081         this.$info
6082                 .addClass( 'oo-ui-selectFileWidget-info' )
6083                 .append( this.$icon, this.$label, this.clearButton.$element, this.$indicator );
6084
6085         if ( config.droppable && config.showDropTarget ) {
6086                 this.selectButton.setIcon( 'upload' );
6087                 this.$thumbnail = $( '<div>' ).addClass( 'oo-ui-selectFileWidget-thumbnail' );
6088                 this.setPendingElement( this.$thumbnail );
6089                 this.$element
6090                         .addClass( 'oo-ui-selectFileWidget-dropTarget oo-ui-selectFileWidget' )
6091                         .on( {
6092                                 click: this.onDropTargetClick.bind( this )
6093                         } )
6094                         .append(
6095                                 this.$thumbnail,
6096                                 this.$info,
6097                                 this.selectButton.$element,
6098                                 $( '<span>' )
6099                                         .addClass( 'oo-ui-selectFileWidget-dropLabel' )
6100                                         .text( OO.ui.msg( 'ooui-selectfile-dragdrop-placeholder' ) )
6101                         );
6102         } else {
6103                 this.$element
6104                         .addClass( 'oo-ui-selectFileWidget' )
6105                         .append( this.$info, this.selectButton.$element );
6106         }
6107         this.updateUI();
6108 };
6109
6110 /* Setup */
6111
6112 OO.inheritClass( OO.ui.SelectFileWidget, OO.ui.Widget );
6113 OO.mixinClass( OO.ui.SelectFileWidget, OO.ui.mixin.IconElement );
6114 OO.mixinClass( OO.ui.SelectFileWidget, OO.ui.mixin.IndicatorElement );
6115 OO.mixinClass( OO.ui.SelectFileWidget, OO.ui.mixin.PendingElement );
6116 OO.mixinClass( OO.ui.SelectFileWidget, OO.ui.mixin.LabelElement );
6117
6118 /* Static Properties */
6119
6120 /**
6121  * Check if this widget is supported
6122  *
6123  * @static
6124  * @return {boolean}
6125  */
6126 OO.ui.SelectFileWidget.static.isSupported = function () {
6127         var $input;
6128         if ( OO.ui.SelectFileWidget.static.isSupportedCache === null ) {
6129                 $input = $( '<input>' ).attr( 'type', 'file' );
6130                 OO.ui.SelectFileWidget.static.isSupportedCache = $input[ 0 ].files !== undefined;
6131         }
6132         return OO.ui.SelectFileWidget.static.isSupportedCache;
6133 };
6134
6135 OO.ui.SelectFileWidget.static.isSupportedCache = null;
6136
6137 /* Events */
6138
6139 /**
6140  * @event change
6141  *
6142  * A change event is emitted when the on/off state of the toggle changes.
6143  *
6144  * @param {File|null} value New value
6145  */
6146
6147 /* Methods */
6148
6149 /**
6150  * Get the current value of the field
6151  *
6152  * @return {File|null}
6153  */
6154 OO.ui.SelectFileWidget.prototype.getValue = function () {
6155         return this.currentFile;
6156 };
6157
6158 /**
6159  * Set the current value of the field
6160  *
6161  * @param {File|null} file File to select
6162  */
6163 OO.ui.SelectFileWidget.prototype.setValue = function ( file ) {
6164         if ( this.currentFile !== file ) {
6165                 this.currentFile = file;
6166                 this.updateUI();
6167                 this.emit( 'change', this.currentFile );
6168         }
6169 };
6170
6171 /**
6172  * Focus the widget.
6173  *
6174  * Focusses the select file button.
6175  *
6176  * @chainable
6177  */
6178 OO.ui.SelectFileWidget.prototype.focus = function () {
6179         this.selectButton.focus();
6180         return this;
6181 };
6182
6183 /**
6184  * Blur the widget.
6185  *
6186  * @chainable
6187  */
6188 OO.ui.SelectFileWidget.prototype.blur = function () {
6189         this.selectButton.blur();
6190         return this;
6191 };
6192
6193 /**
6194  * @inheritdoc
6195  */
6196 OO.ui.SelectFileWidget.prototype.simulateLabelClick = function () {
6197         this.focus();
6198 };
6199
6200 /**
6201  * Update the user interface when a file is selected or unselected
6202  *
6203  * @protected
6204  */
6205 OO.ui.SelectFileWidget.prototype.updateUI = function () {
6206         var $label;
6207         if ( !this.isSupported ) {
6208                 this.$element.addClass( 'oo-ui-selectFileWidget-notsupported' );
6209                 this.$element.removeClass( 'oo-ui-selectFileWidget-empty' );
6210                 this.setLabel( this.notsupported );
6211         } else {
6212                 this.$element.addClass( 'oo-ui-selectFileWidget-supported' );
6213                 if ( this.currentFile ) {
6214                         this.$element.removeClass( 'oo-ui-selectFileWidget-empty' );
6215                         $label = $( [] );
6216                         $label = $label.add(
6217                                 $( '<span>' )
6218                                         .addClass( 'oo-ui-selectFileWidget-fileName' )
6219                                         .text( this.currentFile.name )
6220                         );
6221                         this.setLabel( $label );
6222
6223                         if ( this.showDropTarget ) {
6224                                 this.pushPending();
6225                                 this.loadAndGetImageUrl().done( function ( url ) {
6226                                         this.$thumbnail.css( 'background-image', 'url( ' + url + ' )' );
6227                                 }.bind( this ) ).fail( function () {
6228                                         this.$thumbnail.append(
6229                                                 new OO.ui.IconWidget( {
6230                                                         icon: 'attachment',
6231                                                         classes: [ 'oo-ui-selectFileWidget-noThumbnail-icon' ]
6232                                                 } ).$element
6233                                         );
6234                                 }.bind( this ) ).always( function () {
6235                                         this.popPending();
6236                                 }.bind( this ) );
6237                                 this.$element.off( 'click' );
6238                         }
6239                 } else {
6240                         if ( this.showDropTarget ) {
6241                                 this.$element.off( 'click' );
6242                                 this.$element.on( {
6243                                         click: this.onDropTargetClick.bind( this )
6244                                 } );
6245                                 this.$thumbnail
6246                                         .empty()
6247                                         .css( 'background-image', '' );
6248                         }
6249                         this.$element.addClass( 'oo-ui-selectFileWidget-empty' );
6250                         this.setLabel( this.placeholder );
6251                 }
6252         }
6253 };
6254
6255 /**
6256  * If the selected file is an image, get its URL and load it.
6257  *
6258  * @return {jQuery.Promise} Promise resolves with the image URL after it has loaded
6259  */
6260 OO.ui.SelectFileWidget.prototype.loadAndGetImageUrl = function () {
6261         var deferred = $.Deferred(),
6262                 file = this.currentFile,
6263                 reader = new FileReader();
6264
6265         if (
6266                 file &&
6267                 ( OO.getProp( file, 'type' ) || '' ).indexOf( 'image/' ) === 0 &&
6268                 file.size < this.thumbnailSizeLimit * 1024 * 1024
6269         ) {
6270                 reader.onload = function ( event ) {
6271                         var img = document.createElement( 'img' );
6272                         img.addEventListener( 'load', function () {
6273                                 if (
6274                                         img.naturalWidth === 0 ||
6275                                         img.naturalHeight === 0 ||
6276                                         img.complete === false
6277                                 ) {
6278                                         deferred.reject();
6279                                 } else {
6280                                         deferred.resolve( event.target.result );
6281                                 }
6282                         } );
6283                         img.src = event.target.result;
6284                 };
6285                 reader.readAsDataURL( file );
6286         } else {
6287                 deferred.reject();
6288         }
6289
6290         return deferred.promise();
6291 };
6292
6293 /**
6294  * Add the input to the widget
6295  *
6296  * @private
6297  */
6298 OO.ui.SelectFileWidget.prototype.addInput = function () {
6299         if ( this.$input ) {
6300                 this.$input.remove();
6301         }
6302
6303         if ( !this.isSupported ) {
6304                 this.$input = null;
6305                 return;
6306         }
6307
6308         this.$input = $( '<input>' ).attr( 'type', 'file' );
6309         this.$input.on( 'change', this.onFileSelectedHandler );
6310         this.$input.on( 'click', function ( e ) {
6311                 // Prevents dropTarget to get clicked which calls
6312                 // a click on this input
6313                 e.stopPropagation();
6314         } );
6315         this.$input.attr( {
6316                 tabindex: -1
6317         } );
6318         if ( this.accept ) {
6319                 this.$input.attr( 'accept', this.accept.join( ', ' ) );
6320         }
6321         this.selectButton.$button.append( this.$input );
6322 };
6323
6324 /**
6325  * Determine if we should accept this file
6326  *
6327  * @private
6328  * @param {string} mimeType File MIME type
6329  * @return {boolean}
6330  */
6331 OO.ui.SelectFileWidget.prototype.isAllowedType = function ( mimeType ) {
6332         var i, mimeTest;
6333
6334         if ( !this.accept || !mimeType ) {
6335                 return true;
6336         }
6337
6338         for ( i = 0; i < this.accept.length; i++ ) {
6339                 mimeTest = this.accept[ i ];
6340                 if ( mimeTest === mimeType ) {
6341                         return true;
6342                 } else if ( mimeTest.substr( -2 ) === '/*' ) {
6343                         mimeTest = mimeTest.substr( 0, mimeTest.length - 1 );
6344                         if ( mimeType.substr( 0, mimeTest.length ) === mimeTest ) {
6345                                 return true;
6346                         }
6347                 }
6348         }
6349
6350         return false;
6351 };
6352
6353 /**
6354  * Handle file selection from the input
6355  *
6356  * @private
6357  * @param {jQuery.Event} e
6358  */
6359 OO.ui.SelectFileWidget.prototype.onFileSelected = function ( e ) {
6360         var file = OO.getProp( e.target, 'files', 0 ) || null;
6361
6362         if ( file && !this.isAllowedType( file.type ) ) {
6363                 file = null;
6364         }
6365
6366         this.setValue( file );
6367         this.addInput();
6368 };
6369
6370 /**
6371  * Handle clear button click events.
6372  *
6373  * @private
6374  */
6375 OO.ui.SelectFileWidget.prototype.onClearClick = function () {
6376         this.setValue( null );
6377         return false;
6378 };
6379
6380 /**
6381  * Handle key press events.
6382  *
6383  * @private
6384  * @param {jQuery.Event} e Key press event
6385  */
6386 OO.ui.SelectFileWidget.prototype.onKeyPress = function ( e ) {
6387         if ( this.isSupported && !this.isDisabled() && this.$input &&
6388                 ( e.which === OO.ui.Keys.SPACE || e.which === OO.ui.Keys.ENTER )
6389         ) {
6390                 this.$input.click();
6391                 return false;
6392         }
6393 };
6394
6395 /**
6396  * Handle drop target click events.
6397  *
6398  * @private
6399  * @param {jQuery.Event} e Key press event
6400  */
6401 OO.ui.SelectFileWidget.prototype.onDropTargetClick = function () {
6402         if ( this.isSupported && !this.isDisabled() && this.$input ) {
6403                 this.$input.click();
6404                 return false;
6405         }
6406 };
6407
6408 /**
6409  * Handle drag enter and over events
6410  *
6411  * @private
6412  * @param {jQuery.Event} e Drag event
6413  */
6414 OO.ui.SelectFileWidget.prototype.onDragEnterOrOver = function ( e ) {
6415         var itemOrFile,
6416                 droppableFile = false,
6417                 dt = e.originalEvent.dataTransfer;
6418
6419         e.preventDefault();
6420         e.stopPropagation();
6421
6422         if ( this.isDisabled() || !this.isSupported ) {
6423                 this.$element.removeClass( 'oo-ui-selectFileWidget-canDrop' );
6424                 dt.dropEffect = 'none';
6425                 return false;
6426         }
6427
6428         // DataTransferItem and File both have a type property, but in Chrome files
6429         // have no information at this point.
6430         itemOrFile = OO.getProp( dt, 'items', 0 ) || OO.getProp( dt, 'files', 0 );
6431         if ( itemOrFile ) {
6432                 if ( this.isAllowedType( itemOrFile.type ) ) {
6433                         droppableFile = true;
6434                 }
6435         // dt.types is Array-like, but not an Array
6436         } else if ( Array.prototype.indexOf.call( OO.getProp( dt, 'types' ) || [], 'Files' ) !== -1 ) {
6437                 // File information is not available at this point for security so just assume
6438                 // it is acceptable for now.
6439                 // https://bugzilla.mozilla.org/show_bug.cgi?id=640534
6440                 droppableFile = true;
6441         }
6442
6443         this.$element.toggleClass( 'oo-ui-selectFileWidget-canDrop', droppableFile );
6444         if ( !droppableFile ) {
6445                 dt.dropEffect = 'none';
6446         }
6447
6448         return false;
6449 };
6450
6451 /**
6452  * Handle drag leave events
6453  *
6454  * @private
6455  * @param {jQuery.Event} e Drag event
6456  */
6457 OO.ui.SelectFileWidget.prototype.onDragLeave = function () {
6458         this.$element.removeClass( 'oo-ui-selectFileWidget-canDrop' );
6459 };
6460
6461 /**
6462  * Handle drop events
6463  *
6464  * @private
6465  * @param {jQuery.Event} e Drop event
6466  */
6467 OO.ui.SelectFileWidget.prototype.onDrop = function ( e ) {
6468         var file = null,
6469                 dt = e.originalEvent.dataTransfer;
6470
6471         e.preventDefault();
6472         e.stopPropagation();
6473         this.$element.removeClass( 'oo-ui-selectFileWidget-canDrop' );
6474
6475         if ( this.isDisabled() || !this.isSupported ) {
6476                 return false;
6477         }
6478
6479         file = OO.getProp( dt, 'files', 0 );
6480         if ( file && !this.isAllowedType( file.type ) ) {
6481                 file = null;
6482         }
6483         if ( file ) {
6484                 this.setValue( file );
6485         }
6486
6487         return false;
6488 };
6489
6490 /**
6491  * @inheritdoc
6492  */
6493 OO.ui.SelectFileWidget.prototype.setDisabled = function ( disabled ) {
6494         OO.ui.SelectFileWidget.parent.prototype.setDisabled.call( this, disabled );
6495         if ( this.selectButton ) {
6496                 this.selectButton.setDisabled( disabled );
6497         }
6498         if ( this.clearButton ) {
6499                 this.clearButton.setDisabled( disabled );
6500         }
6501         return this;
6502 };
6503
6504 /**
6505  * SearchWidgets combine a {@link OO.ui.TextInputWidget text input field}, where users can type a search query,
6506  * and a menu of search results, which is displayed beneath the query
6507  * field. Unlike {@link OO.ui.mixin.LookupElement lookup menus}, search result menus are always visible to the user.
6508  * Users can choose an item from the menu or type a query into the text field to search for a matching result item.
6509  * In general, search widgets are used inside a separate {@link OO.ui.Dialog dialog} window.
6510  *
6511  * Each time the query is changed, the search result menu is cleared and repopulated. Please see
6512  * the [OOUI demos][1] for an example.
6513  *
6514  * [1]: https://doc.wikimedia.org/oojs-ui/master/demos/#SearchInputWidget-type-search
6515  *
6516  * @class
6517  * @extends OO.ui.Widget
6518  *
6519  * @constructor
6520  * @param {Object} [config] Configuration options
6521  * @cfg {string|jQuery} [placeholder] Placeholder text for query input
6522  * @cfg {string} [value] Initial query value
6523  */
6524 OO.ui.SearchWidget = function OoUiSearchWidget( config ) {
6525         // Configuration initialization
6526         config = config || {};
6527
6528         // Parent constructor
6529         OO.ui.SearchWidget.parent.call( this, config );
6530
6531         // Properties
6532         this.query = new OO.ui.TextInputWidget( {
6533                 icon: 'search',
6534                 placeholder: config.placeholder,
6535                 value: config.value
6536         } );
6537         this.results = new OO.ui.SelectWidget();
6538         this.$query = $( '<div>' );
6539         this.$results = $( '<div>' );
6540
6541         // Events
6542         this.query.connect( this, {
6543                 change: 'onQueryChange',
6544                 enter: 'onQueryEnter'
6545         } );
6546         this.query.$input.on( 'keydown', this.onQueryKeydown.bind( this ) );
6547
6548         // Initialization
6549         this.$query
6550                 .addClass( 'oo-ui-searchWidget-query' )
6551                 .append( this.query.$element );
6552         this.$results
6553                 .addClass( 'oo-ui-searchWidget-results' )
6554                 .append( this.results.$element );
6555         this.$element
6556                 .addClass( 'oo-ui-searchWidget' )
6557                 .append( this.$results, this.$query );
6558 };
6559
6560 /* Setup */
6561
6562 OO.inheritClass( OO.ui.SearchWidget, OO.ui.Widget );
6563
6564 /* Methods */
6565
6566 /**
6567  * Handle query key down events.
6568  *
6569  * @private
6570  * @param {jQuery.Event} e Key down event
6571  */
6572 OO.ui.SearchWidget.prototype.onQueryKeydown = function ( e ) {
6573         var highlightedItem, nextItem,
6574                 dir = e.which === OO.ui.Keys.DOWN ? 1 : ( e.which === OO.ui.Keys.UP ? -1 : 0 );
6575
6576         if ( dir ) {
6577                 highlightedItem = this.results.findHighlightedItem();
6578                 if ( !highlightedItem ) {
6579                         highlightedItem = this.results.findSelectedItem();
6580                 }
6581                 nextItem = this.results.findRelativeSelectableItem( highlightedItem, dir );
6582                 this.results.highlightItem( nextItem );
6583                 nextItem.scrollElementIntoView();
6584         }
6585 };
6586
6587 /**
6588  * Handle select widget select events.
6589  *
6590  * Clears existing results. Subclasses should repopulate items according to new query.
6591  *
6592  * @private
6593  * @param {string} value New value
6594  */
6595 OO.ui.SearchWidget.prototype.onQueryChange = function () {
6596         // Reset
6597         this.results.clearItems();
6598 };
6599
6600 /**
6601  * Handle select widget enter key events.
6602  *
6603  * Chooses highlighted item.
6604  *
6605  * @private
6606  * @param {string} value New value
6607  */
6608 OO.ui.SearchWidget.prototype.onQueryEnter = function () {
6609         var highlightedItem = this.results.findHighlightedItem();
6610         if ( highlightedItem ) {
6611                 this.results.chooseItem( highlightedItem );
6612         }
6613 };
6614
6615 /**
6616  * Get the query input.
6617  *
6618  * @return {OO.ui.TextInputWidget} Query input
6619  */
6620 OO.ui.SearchWidget.prototype.getQuery = function () {
6621         return this.query;
6622 };
6623
6624 /**
6625  * Get the search results menu.
6626  *
6627  * @return {OO.ui.SelectWidget} Menu of search results
6628  */
6629 OO.ui.SearchWidget.prototype.getResults = function () {
6630         return this.results;
6631 };
6632
6633 /**
6634  * NumberInputWidgets combine a {@link OO.ui.TextInputWidget text input} (where a value
6635  * can be entered manually) and two {@link OO.ui.ButtonWidget button widgets}
6636  * (to adjust the value in increments) to allow the user to enter a number.
6637  *
6638  *     @example
6639  *     // Example: A NumberInputWidget.
6640  *     var numberInput = new OO.ui.NumberInputWidget( {
6641  *         label: 'NumberInputWidget',
6642  *         input: { value: 5 },
6643  *         min: 1,
6644  *         max: 10
6645  *     } );
6646  *     $( 'body' ).append( numberInput.$element );
6647  *
6648  * @class
6649  * @extends OO.ui.TextInputWidget
6650  *
6651  * @constructor
6652  * @param {Object} [config] Configuration options
6653  * @cfg {Object} [minusButton] Configuration options to pass to the {@link OO.ui.ButtonWidget decrementing button widget}.
6654  * @cfg {Object} [plusButton] Configuration options to pass to the {@link OO.ui.ButtonWidget incrementing button widget}.
6655  * @cfg {boolean} [allowInteger=false] Whether the field accepts only integer values.
6656  * @cfg {number} [min=-Infinity] Minimum allowed value
6657  * @cfg {number} [max=Infinity] Maximum allowed value
6658  * @cfg {number} [step=1] Delta when using the buttons or up/down arrow keys
6659  * @cfg {number|null} [pageStep] Delta when using the page-up/page-down keys. Defaults to 10 times #step.
6660  * @cfg {boolean} [showButtons=true] Whether to show the plus and minus buttons.
6661  */
6662 OO.ui.NumberInputWidget = function OoUiNumberInputWidget( config ) {
6663         var $field = $( '<div>' )
6664                 .addClass( 'oo-ui-numberInputWidget-field' );
6665
6666         // Configuration initialization
6667         config = $.extend( {
6668                 allowInteger: false,
6669                 min: -Infinity,
6670                 max: Infinity,
6671                 step: 1,
6672                 pageStep: null,
6673                 showButtons: true
6674         }, config );
6675
6676         // For backward compatibility
6677         $.extend( config, config.input );
6678         this.input = this;
6679
6680         // Parent constructor
6681         OO.ui.NumberInputWidget.parent.call( this, $.extend( config, {
6682                 type: 'number'
6683         } ) );
6684
6685         if ( config.showButtons ) {
6686                 this.minusButton = new OO.ui.ButtonWidget( $.extend(
6687                         {
6688                                 disabled: this.isDisabled(),
6689                                 tabIndex: -1,
6690                                 classes: [ 'oo-ui-numberInputWidget-minusButton' ],
6691                                 icon: 'subtract'
6692                         },
6693                         config.minusButton
6694                 ) );
6695                 this.plusButton = new OO.ui.ButtonWidget( $.extend(
6696                         {
6697                                 disabled: this.isDisabled(),
6698                                 tabIndex: -1,
6699                                 classes: [ 'oo-ui-numberInputWidget-plusButton' ],
6700                                 icon: 'add'
6701                         },
6702                         config.plusButton
6703                 ) );
6704         }
6705
6706         // Events
6707         this.$input.on( {
6708                 keydown: this.onKeyDown.bind( this ),
6709                 'wheel mousewheel DOMMouseScroll': this.onWheel.bind( this )
6710         } );
6711         if ( config.showButtons ) {
6712                 this.plusButton.connect( this, {
6713                         click: [ 'onButtonClick', +1 ]
6714                 } );
6715                 this.minusButton.connect( this, {
6716                         click: [ 'onButtonClick', -1 ]
6717                 } );
6718         }
6719
6720         // Build the field
6721         $field.append( this.$input );
6722         if ( config.showButtons ) {
6723                 $field
6724                         .prepend( this.minusButton.$element )
6725                         .append( this.plusButton.$element );
6726         }
6727
6728         // Initialization
6729         this.setAllowInteger( config.allowInteger || config.isInteger );
6730         this.setRange( config.min, config.max );
6731         this.setStep( config.step, config.pageStep );
6732         // Set the validation method after we set allowInteger and range
6733         // so that it doesn't immediately call setValidityFlag
6734         this.setValidation( this.validateNumber.bind( this ) );
6735
6736         this.$element
6737                 .addClass( 'oo-ui-numberInputWidget' )
6738                 .toggleClass( 'oo-ui-numberInputWidget-buttoned', config.showButtons )
6739                 .append( $field );
6740 };
6741
6742 /* Setup */
6743
6744 OO.inheritClass( OO.ui.NumberInputWidget, OO.ui.TextInputWidget );
6745
6746 /* Methods */
6747
6748 /**
6749  * Set whether only integers are allowed
6750  *
6751  * @param {boolean} flag
6752  */
6753 OO.ui.NumberInputWidget.prototype.setAllowInteger = function ( flag ) {
6754         this.allowInteger = !!flag;
6755         this.setValidityFlag();
6756 };
6757 // Backward compatibility
6758 OO.ui.NumberInputWidget.prototype.setIsInteger = OO.ui.NumberInputWidget.prototype.setAllowInteger;
6759
6760 /**
6761  * Get whether only integers are allowed
6762  *
6763  * @return {boolean} Flag value
6764  */
6765 OO.ui.NumberInputWidget.prototype.getAllowInteger = function () {
6766         return this.allowInteger;
6767 };
6768 // Backward compatibility
6769 OO.ui.NumberInputWidget.prototype.getIsInteger = OO.ui.NumberInputWidget.prototype.getAllowInteger;
6770
6771 /**
6772  * Set the range of allowed values
6773  *
6774  * @param {number} min Minimum allowed value
6775  * @param {number} max Maximum allowed value
6776  */
6777 OO.ui.NumberInputWidget.prototype.setRange = function ( min, max ) {
6778         if ( min > max ) {
6779                 throw new Error( 'Minimum (' + min + ') must not be greater than maximum (' + max + ')' );
6780         }
6781         this.min = min;
6782         this.max = max;
6783         this.setValidityFlag();
6784 };
6785
6786 /**
6787  * Get the current range
6788  *
6789  * @return {number[]} Minimum and maximum values
6790  */
6791 OO.ui.NumberInputWidget.prototype.getRange = function () {
6792         return [ this.min, this.max ];
6793 };
6794
6795 /**
6796  * Set the stepping deltas
6797  *
6798  * @param {number} step Normal step
6799  * @param {number|null} pageStep Page step. If null, 10 * step will be used.
6800  */
6801 OO.ui.NumberInputWidget.prototype.setStep = function ( step, pageStep ) {
6802         if ( step <= 0 ) {
6803                 throw new Error( 'Step value must be positive' );
6804         }
6805         if ( pageStep === null ) {
6806                 pageStep = step * 10;
6807         } else if ( pageStep <= 0 ) {
6808                 throw new Error( 'Page step value must be positive' );
6809         }
6810         this.step = step;
6811         this.pageStep = pageStep;
6812 };
6813
6814 /**
6815  * Get the current stepping values
6816  *
6817  * @return {number[]} Step and page step
6818  */
6819 OO.ui.NumberInputWidget.prototype.getStep = function () {
6820         return [ this.step, this.pageStep ];
6821 };
6822
6823 /**
6824  * Get the current value of the widget as a number
6825  *
6826  * @return {number} May be NaN, or an invalid number
6827  */
6828 OO.ui.NumberInputWidget.prototype.getNumericValue = function () {
6829         return +this.getValue();
6830 };
6831
6832 /**
6833  * Adjust the value of the widget
6834  *
6835  * @param {number} delta Adjustment amount
6836  */
6837 OO.ui.NumberInputWidget.prototype.adjustValue = function ( delta ) {
6838         var n, v = this.getNumericValue();
6839
6840         delta = +delta;
6841         if ( isNaN( delta ) || !isFinite( delta ) ) {
6842                 throw new Error( 'Delta must be a finite number' );
6843         }
6844
6845         if ( isNaN( v ) ) {
6846                 n = 0;
6847         } else {
6848                 n = v + delta;
6849                 n = Math.max( Math.min( n, this.max ), this.min );
6850                 if ( this.allowInteger ) {
6851                         n = Math.round( n );
6852                 }
6853         }
6854
6855         if ( n !== v ) {
6856                 this.setValue( n );
6857         }
6858 };
6859 /**
6860  * Validate input
6861  *
6862  * @private
6863  * @param {string} value Field value
6864  * @return {boolean}
6865  */
6866 OO.ui.NumberInputWidget.prototype.validateNumber = function ( value ) {
6867         var n = +value;
6868         if ( value === '' ) {
6869                 return !this.isRequired();
6870         }
6871
6872         if ( isNaN( n ) || !isFinite( n ) ) {
6873                 return false;
6874         }
6875
6876         if ( this.allowInteger && Math.floor( n ) !== n ) {
6877                 return false;
6878         }
6879
6880         if ( n < this.min || n > this.max ) {
6881                 return false;
6882         }
6883
6884         return true;
6885 };
6886
6887 /**
6888  * Handle mouse click events.
6889  *
6890  * @private
6891  * @param {number} dir +1 or -1
6892  */
6893 OO.ui.NumberInputWidget.prototype.onButtonClick = function ( dir ) {
6894         this.adjustValue( dir * this.step );
6895 };
6896
6897 /**
6898  * Handle mouse wheel events.
6899  *
6900  * @private
6901  * @param {jQuery.Event} event
6902  */
6903 OO.ui.NumberInputWidget.prototype.onWheel = function ( event ) {
6904         var delta = 0;
6905
6906         if ( !this.isDisabled() && this.$input.is( ':focus' ) ) {
6907                 // Standard 'wheel' event
6908                 if ( event.originalEvent.deltaMode !== undefined ) {
6909                         this.sawWheelEvent = true;
6910                 }
6911                 if ( event.originalEvent.deltaY ) {
6912                         delta = -event.originalEvent.deltaY;
6913                 } else if ( event.originalEvent.deltaX ) {
6914                         delta = event.originalEvent.deltaX;
6915                 }
6916
6917                 // Non-standard events
6918                 if ( !this.sawWheelEvent ) {
6919                         if ( event.originalEvent.wheelDeltaX ) {
6920                                 delta = -event.originalEvent.wheelDeltaX;
6921                         } else if ( event.originalEvent.wheelDeltaY ) {
6922                                 delta = event.originalEvent.wheelDeltaY;
6923                         } else if ( event.originalEvent.wheelDelta ) {
6924                                 delta = event.originalEvent.wheelDelta;
6925                         } else if ( event.originalEvent.detail ) {
6926                                 delta = -event.originalEvent.detail;
6927                         }
6928                 }
6929
6930                 if ( delta ) {
6931                         delta = delta < 0 ? -1 : 1;
6932                         this.adjustValue( delta * this.step );
6933                 }
6934
6935                 return false;
6936         }
6937 };
6938
6939 /**
6940  * Handle key down events.
6941  *
6942  * @private
6943  * @param {jQuery.Event} e Key down event
6944  */
6945 OO.ui.NumberInputWidget.prototype.onKeyDown = function ( e ) {
6946         if ( !this.isDisabled() ) {
6947                 switch ( e.which ) {
6948                         case OO.ui.Keys.UP:
6949                                 this.adjustValue( this.step );
6950                                 return false;
6951                         case OO.ui.Keys.DOWN:
6952                                 this.adjustValue( -this.step );
6953                                 return false;
6954                         case OO.ui.Keys.PAGEUP:
6955                                 this.adjustValue( this.pageStep );
6956                                 return false;
6957                         case OO.ui.Keys.PAGEDOWN:
6958                                 this.adjustValue( -this.pageStep );
6959                                 return false;
6960                 }
6961         }
6962 };
6963
6964 /**
6965  * @inheritdoc
6966  */
6967 OO.ui.NumberInputWidget.prototype.setDisabled = function ( disabled ) {
6968         // Parent method
6969         OO.ui.NumberInputWidget.parent.prototype.setDisabled.call( this, disabled );
6970
6971         if ( this.minusButton ) {
6972                 this.minusButton.setDisabled( this.isDisabled() );
6973         }
6974         if ( this.plusButton ) {
6975                 this.plusButton.setDisabled( this.isDisabled() );
6976         }
6977
6978         return this;
6979 };
6980
6981 }( OO ) );
6982
6983 //# sourceMappingURL=oojs-ui-widgets.js.map