sources/plugins/floatpanel/plugin.js

   1 /**
   2  * @license Copyright (c) 2003-2017, CKSource - Frederico Knabben. All rights reserved.
   3  * For licensing, see LICENSE.md or http://ckeditor.com/license
   4  */
   5
   6 CKEDITOR.plugins.add( 'floatpanel', {
   7         requires: 'panel'
   8 } );
   9
  10 ( function() {
  11         var panels = {};
  12
  13         function getPanel( editor, doc, parentElement, definition, level ) {
  14                 // Generates the panel key: docId-eleId-skinName-langDir[-uiColor][-CSSs][-level]
  15                 var key = CKEDITOR.tools.genKey( doc.getUniqueId(), parentElement.getUniqueId(), editor.lang.dir, editor.uiColor || '', definition.css || '', level || '' ),
  16                         panel = panels[ key ];
  17
  18                 if ( !panel ) {
  19                         panel = panels[ key ] = new CKEDITOR.ui.panel( doc, definition );
  20                         panel.element = parentElement.append( CKEDITOR.dom.element.createFromHtml( panel.render( editor ), doc ) );
  21
  22                         panel.element.setStyles( {
  23                                 display: 'none',
  24                                 position: 'absolute'
  25                         } );
  26                 }
  27
  28                 return panel;
  29         }
  30
  31         /**
  32          * Represents a floating panel UI element.
  33          *
  34          * It is reused by rich combos, color combos, menus, etc.
  35          * and it renders its content using {@link CKEDITOR.ui.panel}.
  36          *
  37          * @class
  38          * @todo
  39          */
  40         CKEDITOR.ui.floatPanel = CKEDITOR.tools.createClass( {
  41                 /**
  42                  * Creates a floatPanel class instance.
  43                  *
  44                  * @constructor
  45                  * @param {CKEDITOR.editor} editor
  46                  * @param {CKEDITOR.dom.element} parentElement
  47                  * @param {Object} definition Definition of the panel that will be floating.
  48                  * @param {Number} level
  49                  */
  50                 $: function( editor, parentElement, definition, level ) {
  51                         definition.forceIFrame = 1;
  52
  53                         // In case of editor with floating toolbar append panels that should float
  54                         // to the main UI element.
  55                         if ( definition.toolbarRelated && editor.elementMode == CKEDITOR.ELEMENT_MODE_INLINE )
  56                                 parentElement = CKEDITOR.document.getById( 'cke_' + editor.name );
  57
  58                         var doc = parentElement.getDocument(),
  59                                 panel = getPanel( editor, doc, parentElement, definition, level || 0 ),
  60                                 element = panel.element,
  61                                 iframe = element.getFirst(),
  62                                 that = this;
  63
  64                         // Disable native browser menu. (http://dev.ckeditor.com/ticket/4825)
  65                         element.disableContextMenu();
  66
  67                         this.element = element;
  68
  69                         this._ = {
  70                                 editor: editor,
  71                                 // The panel that will be floating.
  72                                 panel: panel,
  73                                 parentElement: parentElement,
  74                                 definition: definition,
  75                                 document: doc,
  76                                 iframe: iframe,
  77                                 children: [],
  78                                 dir: editor.lang.dir,
  79                                 showBlockParams: null
  80                         };
  81
  82                         editor.on( 'mode', hide );
  83                         editor.on( 'resize', hide );
  84
  85                         // When resize of the window is triggered floatpanel should be repositioned according to new dimensions.
  86                         // http://dev.ckeditor.com/ticket/11724. Fixes issue with undesired panel hiding on Android and iOS.
  87                         doc.getWindow().on( 'resize', function() {
  88                                 this.reposition();
  89                         }, this );
  90
  91                         // We need a wrapper because events implementation doesn't allow to attach
  92                         // one listener more than once for the same event on the same object.
  93                         // Remember that floatPanel#hide is shared between all instances.
  94                         function hide() {
  95                                 that.hide();
  96                         }
  97                 },
  98
  99                 proto: {
 100                         /**
 101                          * @todo
 102                          */
 103                         addBlock: function( name, block ) {
 104                                 return this._.panel.addBlock( name, block );
 105                         },
 106
 107                         /**
 108                          * @todo
 109                          */
 110                         addListBlock: function( name, multiSelect ) {
 111                                 return this._.panel.addListBlock( name, multiSelect );
 112                         },
 113
 114                         /**
 115                          * @todo
 116                          */
 117                         getBlock: function( name ) {
 118                                 return this._.panel.getBlock( name );
 119                         },
 120
 121                         /**
 122                          * Shows the panel block.
 123                          *
 124                          * @param {String} name
 125                          * @param {CKEDITOR.dom.element} offsetParent Positioned parent.
 126                          * @param {Number} corner
 127                          *
 128                          * * For LTR (left to right) oriented editor:
 129                          *      * `1` = top-left
 130                          *      * `2` = top-right
 131                          *      * `3` = bottom-right
 132                          *      * `4` = bottom-left
 133                          * * For RTL (right to left):
 134                          *      * `1` = top-right
 135                          *      * `2` = top-left
 136                          *      * `3` = bottom-left
 137                          *      * `4` = bottom-right
 138                          *
 139                          * @param {Number} [offsetX=0]
 140                          * @param {Number} [offsetY=0]
 141                          * @param {Function} [callback] A callback function executed when block positioning is done.
 142                          * @todo what do exactly these params mean (especially corner)?
 143                          */
 144                         showBlock: function( name, offsetParent, corner, offsetX, offsetY, callback ) {
 145                                 var panel = this._.panel,
 146                                         block = panel.showBlock( name );
 147
 148                                 this._.showBlockParams = [].slice.call( arguments );
 149                                 this.allowBlur( false );
 150
 151                                 // Record from where the focus is when open panel.
 152                                 var editable = this._.editor.editable();
 153                                 this._.returnFocus = editable.hasFocus ? editable : new CKEDITOR.dom.element( CKEDITOR.document.$.activeElement );
 154                                 this._.hideTimeout = 0;
 155
 156                                 var element = this.element,
 157                                         iframe = this._.iframe,
 158                                         // Edge prefers iframe's window to the iframe, just like the rest of the browsers (http://dev.ckeditor.com/ticket/13143).
 159                                         focused = CKEDITOR.env.ie && !CKEDITOR.env.edge ? iframe : new CKEDITOR.dom.window( iframe.$.contentWindow ),
 160                                         doc = element.getDocument(),
 161                                         positionedAncestor = this._.parentElement.getPositionedAncestor(),
 162                                         position = offsetParent.getDocumentPosition( doc ),
 163                                         positionedAncestorPosition = positionedAncestor ? positionedAncestor.getDocumentPosition( doc ) : { x: 0, y: 0 },
 164                                         rtl = this._.dir == 'rtl',
 165                                         left = position.x + ( offsetX || 0 ) - positionedAncestorPosition.x,
 166                                         top = position.y + ( offsetY || 0 ) - positionedAncestorPosition.y;
 167
 168                                 // Floating panels are off by (-1px, 0px) in RTL mode. (http://dev.ckeditor.com/ticket/3438)
 169                                 if ( rtl && ( corner == 1 || corner == 4 ) )
 170                                         left += offsetParent.$.offsetWidth;
 171                                 else if ( !rtl && ( corner == 2 || corner == 3 ) )
 172                                         left += offsetParent.$.offsetWidth - 1;
 173
 174                                 if ( corner == 3 || corner == 4 )
 175                                         top += offsetParent.$.offsetHeight - 1;
 176
 177                                 // Memorize offsetParent by it's ID.
 178                                 this._.panel._.offsetParentId = offsetParent.getId();
 179
 180                                 element.setStyles( {
 181                                         top: top + 'px',
 182                                         left: 0,
 183                                         display: ''
 184                                 } );
 185
 186                                 // Don't use display or visibility style because we need to
 187                                 // calculate the rendering layout later and focus the element.
 188                                 element.setOpacity( 0 );
 189
 190                                 // To allow the context menu to decrease back their width
 191                                 element.getFirst().removeStyle( 'width' );
 192
 193                                 // Report to focus manager.
 194                                 this._.editor.focusManager.add( focused );
 195
 196                                 // Configure the IFrame blur event. Do that only once.
 197                                 if ( !this._.blurSet ) {
 198
 199                                         // With addEventListener compatible browsers, we must
 200                                         // useCapture when registering the focus/blur events to
 201                                         // guarantee they will be firing in all situations. (http://dev.ckeditor.com/ticket/3068, http://dev.ckeditor.com/ticket/3222 )
 202                                         CKEDITOR.event.useCapture = true;
 203
 204                                         focused.on( 'blur', function( ev ) {
 205                                                 // As we are using capture to register the listener,
 206                                                 // the blur event may get fired even when focusing
 207                                                 // inside the window itself, so we must ensure the
 208                                                 // target is out of it.
 209                                                 if ( !this.allowBlur() || ev.data.getPhase() != CKEDITOR.EVENT_PHASE_AT_TARGET )
 210                                                         return;
 211
 212                                                 if ( this.visible && !this._.activeChild ) {
 213                                                         // [iOS] Allow hide to be prevented if touch is bound
 214                                                         // to any parent of the iframe blur happens before touch (http://dev.ckeditor.com/ticket/10714).
 215                                                         if ( CKEDITOR.env.iOS ) {
 216                                                                 if ( !this._.hideTimeout )
 217                                                                         this._.hideTimeout = CKEDITOR.tools.setTimeout( doHide, 0, this );
 218                                                         } else {
 219                                                                 doHide.call( this );
 220                                                         }
 221                                                 }
 222
 223                                                 function doHide() {
 224                                                         // Panel close is caused by user's navigating away the focus, e.g. click outside the panel.
 225                                                         // DO NOT restore focus in this case.
 226                                                         delete this._.returnFocus;
 227                                                         this.hide();
 228                                                 }
 229                                         }, this );
 230
 231                                         focused.on( 'focus', function() {
 232                                                 this._.focused = true;
 233                                                 this.hideChild();
 234                                                 this.allowBlur( true );
 235                                         }, this );
 236
 237                                         // [iOS] if touch is bound to any parent of the iframe blur
 238                                         // happens twice before touchstart and before touchend (http://dev.ckeditor.com/ticket/10714).
 239                                         if ( CKEDITOR.env.iOS ) {
 240                                                 // Prevent false hiding on blur.
 241                                                 // We don't need to return focus here because touchend will fire anyway.
 242                                                 // If user scrolls and pointer gets out of the panel area touchend will also fire.
 243                                                 focused.on( 'touchstart', function() {
 244                                                         clearTimeout( this._.hideTimeout );
 245                                                 }, this );
 246
 247                                                 // Set focus back to handle blur and hide panel when needed.
 248                                                 focused.on( 'touchend', function() {
 249                                                         this._.hideTimeout = 0;
 250                                                         this.focus();
 251                                                 }, this );
 252                                         }
 253
 254                                         CKEDITOR.event.useCapture = false;
 255
 256                                         this._.blurSet = 1;
 257                                 }
 258
 259                                 panel.onEscape = CKEDITOR.tools.bind( function( keystroke ) {
 260                                         if ( this.onEscape && this.onEscape( keystroke ) === false )
 261                                                 return false;
 262                                 }, this );
 263
 264                                 CKEDITOR.tools.setTimeout( function() {
 265                                         var panelLoad = CKEDITOR.tools.bind( function() {
 266                                                 var target = element;
 267
 268                                                 // Reset panel width as the new content can be narrower
 269                                                 // than the old one. (http://dev.ckeditor.com/ticket/9355)
 270                                                 target.removeStyle( 'width' );
 271
 272                                                 if ( block.autoSize ) {
 273                                                         var panelDoc = block.element.getDocument(),
 274                                                                 width = ( ( CKEDITOR.env.webkit || CKEDITOR.env.edge ) ? block.element : panelDoc.getBody() ).$.scrollWidth;
 275
 276                                                         // Account for extra height needed due to IE quirks box model bug:
 277                                                         // http://en.wikipedia.org/wiki/Internet_Explorer_box_model_bug
 278                                                         // (http://dev.ckeditor.com/ticket/3426)
 279                                                         if ( CKEDITOR.env.ie && CKEDITOR.env.quirks && width > 0 )
 280                                                                 width += ( target.$.offsetWidth || 0 ) - ( target.$.clientWidth || 0 ) + 3;
 281
 282                                                         // Add some extra pixels to improve the appearance.
 283                                                         width += 10;
 284
 285                                                         target.setStyle( 'width', width + 'px' );
 286
 287                                                         var height = block.element.$.scrollHeight;
 288
 289                                                         // Account for extra height needed due to IE quirks box model bug:
 290                                                         // http://en.wikipedia.org/wiki/Internet_Explorer_box_model_bug
 291                                                         // (http://dev.ckeditor.com/ticket/3426)
 292                                                         if ( CKEDITOR.env.ie && CKEDITOR.env.quirks && height > 0 )
 293                                                                 height += ( target.$.offsetHeight || 0 ) - ( target.$.clientHeight || 0 ) + 3;
 294
 295                                                         target.setStyle( 'height', height + 'px' );
 296
 297                                                         // Fix IE < 8 visibility.
 298                                                         panel._.currentBlock.element.setStyle( 'display', 'none' ).removeStyle( 'display' );
 299                                                 } else {
 300                                                         target.removeStyle( 'height' );
 301                                                 }
 302
 303                                                 // Flip panel layout horizontally in RTL with known width.
 304                                                 if ( rtl )
 305                                                         left -= element.$.offsetWidth;
 306
 307                                                 // Pop the style now for measurement.
 308                                                 element.setStyle( 'left', left + 'px' );
 309
 310                                                 /* panel layout smartly fit the viewport size. */
 311                                                 var panelElement = panel.element,
 312                                                         panelWindow = panelElement.getWindow(),
 313                                                         rect = element.$.getBoundingClientRect(),
 314                                                         viewportSize = panelWindow.getViewPaneSize();
 315
 316                                                 // Compensation for browsers that dont support "width" and "height".
 317                                                 var rectWidth = rect.width || rect.right - rect.left,
 318                                                         rectHeight = rect.height || rect.bottom - rect.top;
 319
 320                                                 // Check if default horizontal layout is impossible.
 321                                                 var spaceAfter = rtl ? rect.right : viewportSize.width - rect.left,
 322                                                         spaceBefore = rtl ? viewportSize.width - rect.right : rect.left;
 323
 324                                                 if ( rtl ) {
 325                                                         if ( spaceAfter < rectWidth ) {
 326                                                                 // Flip to show on right.
 327                                                                 if ( spaceBefore > rectWidth )
 328                                                                         left += rectWidth;
 329                                                                 // Align to window left.
 330                                                                 else if ( viewportSize.width > rectWidth )
 331                                                                         left = left - rect.left;
 332                                                                 // Align to window right, never cutting the panel at right.
 333                                                                 else
 334                                                                         left = left - rect.right + viewportSize.width;
 335                                                         }
 336                                                 } else if ( spaceAfter < rectWidth ) {
 337                                                         // Flip to show on left.
 338                                                         if ( spaceBefore > rectWidth )
 339                                                                 left -= rectWidth;
 340                                                         // Align to window right.
 341                                                         else if ( viewportSize.width > rectWidth )
 342                                                                 left = left - rect.right + viewportSize.width;
 343                                                         // Align to window left, never cutting the panel at left.
 344                                                         else
 345                                                                 left = left - rect.left;
 346                                                 }
 347
 348
 349                                                 // Check if the default vertical layout is possible.
 350                                                 var spaceBelow = viewportSize.height - rect.top,
 351                                                         spaceAbove = rect.top;
 352
 353                                                 if ( spaceBelow < rectHeight ) {
 354                                                         // Flip to show above.
 355                                                         if ( spaceAbove > rectHeight )
 356                                                                 top -= rectHeight;
 357                                                         // Align to window bottom.
 358                                                         else if ( viewportSize.height > rectHeight )
 359                                                                 top = top - rect.bottom + viewportSize.height;
 360                                                         // Align to top, never cutting the panel at top.
 361                                                         else
 362                                                                 top = top - rect.top;
 363                                                 }
 364
 365                                                 // If IE is in RTL, we have troubles with absolute
 366                                                 // position and horizontal scrolls. Here we have a
 367                                                 // series of hacks to workaround it. (http://dev.ckeditor.com/ticket/6146)
 368                                                 if ( CKEDITOR.env.ie ) {
 369                                                         var offsetParent = new CKEDITOR.dom.element( element.$.offsetParent ),
 370                                                                 scrollParent = offsetParent;
 371
 372                                                         // Quirks returns <body>, but standards returns <html>.
 373                                                         if ( scrollParent.getName() == 'html' )
 374                                                                 scrollParent = scrollParent.getDocument().getBody();
 375
 376                                                         if ( scrollParent.getComputedStyle( 'direction' ) == 'rtl' ) {
 377                                                                 // For IE8, there is not much logic on this, but it works.
 378                                                                 if ( CKEDITOR.env.ie8Compat )
 379                                                                         left -= element.getDocument().getDocumentElement().$.scrollLeft * 2;
 380                                                                 else
 381                                                                         left -= ( offsetParent.$.scrollWidth - offsetParent.$.clientWidth );
 382                                                         }
 383                                                 }
 384
 385                                                 // Trigger the onHide event of the previously active panel to prevent
 386                                                 // incorrect styles from being applied (http://dev.ckeditor.com/ticket/6170)
 387                                                 var innerElement = element.getFirst(),
 388                                                         activePanel;
 389                                                 if ( ( activePanel = innerElement.getCustomData( 'activePanel' ) ) )
 390                                                         activePanel.onHide && activePanel.onHide.call( this, 1 );
 391                                                 innerElement.setCustomData( 'activePanel', this );
 392
 393                                                 element.setStyles( {
 394                                                         top: top + 'px',
 395                                                         left: left + 'px'
 396                                                 } );
 397                                                 element.setOpacity( 1 );
 398
 399                                                 callback && callback();
 400                                         }, this );
 401
 402                                         panel.isLoaded ? panelLoad() : panel.onLoad = panelLoad;
 403
 404                                         CKEDITOR.tools.setTimeout( function() {
 405                                                 var scrollTop = CKEDITOR.env.webkit && CKEDITOR.document.getWindow().getScrollPosition().y;
 406
 407                                                 // Focus the panel frame first, so blur gets fired.
 408                                                 this.focus();
 409
 410                                                 // Focus the block now.
 411                                                 block.element.focus();
 412
 413                                                 // http://dev.ckeditor.com/ticket/10623, http://dev.ckeditor.com/ticket/10951 - restore the viewport's scroll position after focusing list element.
 414                                                 if ( CKEDITOR.env.webkit )
 415                                                         CKEDITOR.document.getBody().$.scrollTop = scrollTop;
 416
 417                                                 // We need this get fired manually because of unfired focus() function.
 418                                                 this.allowBlur( true );
 419
 420                                                 // Ensure that the first item is focused (http://dev.ckeditor.com/ticket/16804).
 421                                                 if ( CKEDITOR.env.ie ) {
 422                                                         CKEDITOR.tools.setTimeout( function() {
 423                                                                 block.markFirstDisplayed ? block.markFirstDisplayed() : block._.markFirstDisplayed();
 424                                                         }, 0 );
 425                                                 } else {
 426                                                         block.markFirstDisplayed ? block.markFirstDisplayed() : block._.markFirstDisplayed();
 427                                                 }
 428
 429                                                 this._.editor.fire( 'panelShow', this );
 430                                         }, 0, this );
 431                                 }, CKEDITOR.env.air ? 200 : 0, this );
 432                                 this.visible = 1;
 433
 434                                 if ( this.onShow )
 435                                         this.onShow.call( this );
 436                         },
 437
 438                         /**
 439                          * Repositions the panel with the same parameters that were used in the last {@link #showBlock} call.
 440                          *
 441                          * @since 4.5.4
 442                          */
 443                         reposition: function() {
 444                                 var blockParams = this._.showBlockParams;
 445
 446                                 if ( this.visible && this._.showBlockParams ) {
 447                                         this.hide();
 448                                         this.showBlock.apply( this, blockParams );
 449                                 }
 450                         },
 451
 452                         /**
 453                          * Restores the last focused element or simply focuses the panel window.
 454                          */
 455                         focus: function() {
 456                                 // Webkit requires to blur any previous focused page element, in
 457                                 // order to properly fire the "focus" event.
 458                                 if ( CKEDITOR.env.webkit ) {
 459                                         var active = CKEDITOR.document.getActive();
 460                                         active && !active.equals( this._.iframe ) && active.$.blur();
 461                                 }
 462
 463                                 // Restore last focused element or simply focus panel window.
 464                                 var focus = this._.lastFocused || this._.iframe.getFrameDocument().getWindow();
 465                                 focus.focus();
 466                         },
 467
 468                         /**
 469                          * @todo
 470                          */
 471                         blur: function() {
 472                                 var doc = this._.iframe.getFrameDocument(),
 473                                         active = doc.getActive();
 474
 475                                 active && active.is( 'a' ) && ( this._.lastFocused = active );
 476                         },
 477
 478                         /**
 479                          * Hides the panel.
 480                          *
 481                          * @todo
 482                          */
 483                         hide: function( returnFocus ) {
 484                                 if ( this.visible && ( !this.onHide || this.onHide.call( this ) !== true ) ) {
 485                                         this.hideChild();
 486                                         // Blur previously focused element. (http://dev.ckeditor.com/ticket/6671)
 487                                         CKEDITOR.env.gecko && this._.iframe.getFrameDocument().$.activeElement.blur();
 488                                         this.element.setStyle( 'display', 'none' );
 489                                         this.visible = 0;
 490                                         this.element.getFirst().removeCustomData( 'activePanel' );
 491
 492                                         // Return focus properly. (http://dev.ckeditor.com/ticket/6247)
 493                                         var focusReturn = returnFocus && this._.returnFocus;
 494                                         if ( focusReturn ) {
 495                                                 // Webkit requires focus moved out panel iframe first.
 496                                                 if ( CKEDITOR.env.webkit && focusReturn.type )
 497                                                         focusReturn.getWindow().$.focus();
 498
 499                                                 focusReturn.focus();
 500                                         }
 501
 502                                         delete this._.lastFocused;
 503                                         this._.showBlockParams = null;
 504
 505                                         this._.editor.fire( 'panelHide', this );
 506                                 }
 507                         },
 508
 509                         /**
 510                          * @todo
 511                          */
 512                         allowBlur: function( allow ) {
 513                                 // Prevent editor from hiding the panel. (http://dev.ckeditor.com/ticket/3222)
 514                                 var panel = this._.panel;
 515                                 if ( allow !== undefined )
 516                                         panel.allowBlur = allow;
 517
 518                                 return panel.allowBlur;
 519                         },
 520
 521                         /**
 522                          * Shows the specified panel as a child of one block of this one.
 523                          *
 524                          * @param {CKEDITOR.ui.floatPanel} panel
 525                          * @param {String} blockName
 526                          * @param {CKEDITOR.dom.element} offsetParent Positioned parent.
 527                          * @param {Number} corner
 528                          *
 529                          * * For LTR (left to right) oriented editor:
 530                          *      * `1` = top-left
 531                          *      * `2` = top-right
 532                          *      * `3` = bottom-right
 533                          *      * `4` = bottom-left
 534                          * * For RTL (right to left):
 535                          *      * `1` = top-right
 536                          *      * `2` = top-left
 537                          *      * `3` = bottom-left
 538                          *      * `4` = bottom-right
 539                          *
 540                          * @param {Number} [offsetX=0]
 541                          * @param {Number} [offsetY=0]
 542                          * @todo
 543                          */
 544                         showAsChild: function( panel, blockName, offsetParent, corner, offsetX, offsetY ) {
 545                                 // Skip reshowing of child which is already visible.
 546                                 if ( this._.activeChild == panel && panel._.panel._.offsetParentId == offsetParent.getId() )
 547                                         return;
 548
 549                                 this.hideChild();
 550
 551                                 panel.onHide = CKEDITOR.tools.bind( function() {
 552                                         // Use a timeout, so we give time for this menu to get
 553                                         // potentially focused.
 554                                         CKEDITOR.tools.setTimeout( function() {
 555                                                 if ( !this._.focused )
 556                                                         this.hide();
 557                                         }, 0, this );
 558                                 }, this );
 559
 560                                 this._.activeChild = panel;
 561                                 this._.focused = false;
 562
 563                                 panel.showBlock( blockName, offsetParent, corner, offsetX, offsetY );
 564                                 this.blur();
 565
 566                                 /* http://dev.ckeditor.com/ticket/3767 IE: Second level menu may not have borders */
 567                                 if ( CKEDITOR.env.ie7Compat || CKEDITOR.env.ie6Compat ) {
 568                                         setTimeout( function() {
 569                                                 panel.element.getChild( 0 ).$.style.cssText += '';
 570                                         }, 100 );
 571                                 }
 572                         },
 573
 574                         /**
 575                          * @todo
 576                          */
 577                         hideChild: function( restoreFocus ) {
 578                                 var activeChild = this._.activeChild;
 579
 580                                 if ( activeChild ) {
 581                                         delete activeChild.onHide;
 582                                         delete this._.activeChild;
 583                                         activeChild.hide();
 584
 585                                         // At this point focus should be moved back to parent panel.
 586                                         restoreFocus && this.focus();
 587                                 }
 588                         }
 589                 }
 590         } );
 591
 592         CKEDITOR.on( 'instanceDestroyed', function() {
 593                 var isLastInstance = CKEDITOR.tools.isEmpty( CKEDITOR.instances );
 594
 595                 for ( var i in panels ) {
 596                         var panel = panels[ i ];
 597                         // Safe to destroy it since there're no more instances.(http://dev.ckeditor.com/ticket/4241)
 598                         if ( isLastInstance )
 599                                 panel.destroy();
 600                         // Panel might be used by other instances, just hide them.(http://dev.ckeditor.com/ticket/4552)
 601                         else
 602                                 panel.element.hide();
 603                 }
 604                 // Remove the registration.
 605                 isLastInstance && ( panels = {} );
 606
 607         } );
 608 } )();