text: /**
   * @license Copyright (c) 2003-2015, CKSource - Frederico Knabben. All rights reserved.
   * For licensing, see LICENSE.md or http://ckeditor.com/license
   */
  
  /**
   * @fileOverview The floating dialog plugin.
   */
  
  /**
   * No resize for this dialog.
   *
   * @readonly
   * @property {Number} [=0]
   * @member CKEDITOR
   */
  CKEDITOR.DIALOG_RESIZE_NONE = 0;
  
  /**
   * Only allow horizontal resizing for this dialog, disable vertical resizing.
   *
   * @readonly
   * @property {Number} [=1]
   * @member CKEDITOR
   */
  CKEDITOR.DIALOG_RESIZE_WIDTH = 1;
  
  /**
   * Only allow vertical resizing for this dialog, disable horizontal resizing.
   *
   * @readonly
   * @property {Number} [=2]
   * @member CKEDITOR
   */
  CKEDITOR.DIALOG_RESIZE_HEIGHT = 2;
  
  /**
   * Allow the dialog to be resized in both directions.
   *
   * @readonly
   * @property {Number} [=3]
   * @member CKEDITOR
   */
  CKEDITOR.DIALOG_RESIZE_BOTH = 3;
  
  /**
   * Dialog state when idle.
   *
   * @readonly
   * @property {Number} [=1]
   * @member CKEDITOR
   */
  CKEDITOR.DIALOG_STATE_IDLE = 1;
  
  /**
   * Dialog state when busy.
   *
   * @readonly
   * @property {Number} [=2]
   * @member CKEDITOR
   */
  CKEDITOR.DIALOG_STATE_BUSY = 2;
  
  ( function() {
  	var cssLength = CKEDITOR.tools.cssLength;
  
  	function isTabVisible( tabId ) {
  		return !!this._.tabs[ tabId ][ 0 ].$.offsetHeight;
  	}
  
  	function getPreviousVisibleTab() {
  		var tabId = this._.currentTabId,
  			length = this._.tabIdList.length,
  			tabIndex = CKEDITOR.tools.indexOf( this._.tabIdList, tabId ) + length;
  
  		for ( var i = tabIndex - 1; i > tabIndex - length; i-- ) {
  			if ( isTabVisible.call( this, this._.tabIdList[ i % length ] ) )
  				return this._.tabIdList[ i % length ];
  		}
  
  		return null;
  	}
  
  	function getNextVisibleTab() {
  		var tabId = this._.currentTabId,
  			length = this._.tabIdList.length,
  			tabIndex = CKEDITOR.tools.indexOf( this._.tabIdList, tabId );
  
  		for ( var i = tabIndex + 1; i < tabIndex + length; i++ ) {
  			if ( isTabVisible.call( this, this._.tabIdList[ i % length ] ) )
  				return this._.tabIdList[ i % length ];
  		}
  
  		return null;
  	}
  
  
  	function clearOrRecoverTextInputValue( container, isRecover ) {
  		var inputs = container.$.getElementsByTagName( 'input' );
  		for ( var i = 0, length = inputs.length; i < length; i++ ) {
  			var item = new CKEDITOR.dom.element( inputs[ i ] );
  
  			if ( item.getAttribute( 'type' ).toLowerCase() == 'text' ) {
  				if ( isRecover ) {
  					item.setAttribute( 'value', item.getCustomData( 'fake_value' ) || '' );
  					item.removeCustomData( 'fake_value' );
  				} else {
  					item.setCustomData( 'fake_value', item.getAttribute( 'value' ) );
  					item.setAttribute( 'value', '' );
  				}
  			}
  		}
  	}
  
  	// Handle dialog element validation state UI changes.
  	function handleFieldValidated( isValid, msg ) {
  		var input = this.getInputElement();
  		if ( input )
  			isValid ? input.removeAttribute( 'aria-invalid' ) : input.setAttribute( 'aria-invalid', true );
  
  		if ( !isValid ) {
  			if ( this.select )
  				this.select();
  			else
  				this.focus();
  		}
  
  		msg && alert( msg ); // jshint ignore:line
  
  		this.fire( 'validated', { valid: isValid, msg: msg } );
  	}
  
  	function resetField() {
  		var input = this.getInputElement();
  		input && input.removeAttribute( 'aria-invalid' );
  	}
  
  	var templateSource = '<div class="cke_reset_all {editorId} {editorDialogClass} {hidpi}' +
  		'" dir="{langDir}"' +
  		' lang="{langCode}"' +
  		' role="dialog"' +
  		' aria-labelledby="cke_dialog_title_{id}"' +
  		'>' +
  		'<table class="cke_dialog ' + CKEDITOR.env.cssClass + ' cke_{langDir}"' +
  			' style="position:absolute" role="presentation">' +
  			'<tr><td role="presentation">' +
  			'<div class="cke_dialog_body" role="presentation">' +
  				'<div id="cke_dialog_title_{id}" class="cke_dialog_title" role="presentation"></div>' +
  				'<a id="cke_dialog_close_button_{id}" class="cke_dialog_close_button" href="javascript:void(0)" title="{closeTitle}" role="button"><span class="cke_label">X</span></a>' +
  				'<div id="cke_dialog_tabs_{id}" class="cke_dialog_tabs" role="tablist"></div>' +
  				'<table class="cke_dialog_contents" role="presentation">' +
  				'<tr>' +
  					'<td id="cke_dialog_contents_{id}" class="cke_dialog_contents_body" role="presentation"></td>' +
  				'</tr>' +
  				'<tr>' +
  					'<td id="cke_dialog_footer_{id}" class="cke_dialog_footer" role="presentation"></td>' +
  				'</tr>' +
  				'</table>' +
  			'</div>' +
  			'</td></tr>' +
  		'</table>' +
  		'</div>';
  
  	function buildDialog( editor ) {
  		var element = CKEDITOR.dom.element.createFromHtml( CKEDITOR.addTemplate( 'dialog', templateSource ).output( {
  			id: CKEDITOR.tools.getNextNumber(),
  			editorId: editor.id,
  			langDir: editor.lang.dir,
  			langCode: editor.langCode,
  			editorDialogClass: 'cke_editor_' + editor.name.replace( /\./g, '\\.' ) + '_dialog',
  			closeTitle: editor.lang.common.close,
  			hidpi: CKEDITOR.env.hidpi ? 'cke_hidpi' : ''
  		} ) );
  
  		// TODO: Change this to getById(), so it'll support custom templates.
  		var body = element.getChild( [ 0, 0, 0, 0, 0 ] ),
  			title = body.getChild( 0 ),
  			close = body.getChild( 1 );
  
  		// IFrame shim for dialog that masks activeX in IE. (#7619)
  		if ( CKEDITOR.env.ie && !CKEDITOR.env.quirks ) {
  			var src = 'javascript:void(function(){' + encodeURIComponent( 'document.open();(' + CKEDITOR.tools.fixDomain + ')();document.close();' ) + '}())', // jshint ignore:line
  				iframe = CKEDITOR.dom.element.createFromHtml( '<iframe' +
  					' frameBorder="0"' +
  					' class="cke_iframe_shim"' +
  					' src="' + src + '"' +
  					' tabIndex="-1"' +
  					'></iframe>' );
  			iframe.appendTo( body.getParent() );
  		}
  
  		// Make the Title and Close Button unselectable.
  		title.unselectable();
  		close.unselectable();
  
  		return {
  			element: element,
  			parts: {
  				dialog: element.getChild( 0 ),
  				title: title,
  				close: close,
  				tabs: body.getChild( 2 ),
  				contents: body.getChild( [ 3, 0, 0, 0 ] ),
  				footer: body.getChild( [ 3, 0, 1, 0 ] )
  			}
  		};
  	}
  
  	/**
  	 * This is the base class for runtime dialog objects. An instance of this
  	 * class represents a single named dialog for a single editor instance.
  	 *
  	 *		var dialogObj = new CKEDITOR.dialog( editor, 'smiley' );
  	 *
  	 * @class
  	 * @constructor Creates a dialog class instance.
  	 * @param {Object} editor The editor which created the dialog.
  	 * @param {String} dialogName The dialog's registered name.
  	 */
  	CKEDITOR.dialog = function( editor, dialogName ) {
  		// Load the dialog definition.
  		var definition = CKEDITOR.dialog._.dialogDefinitions[ dialogName ],
  			defaultDefinition = CKEDITOR.tools.clone( defaultDialogDefinition ),
  			buttonsOrder = editor.config.dialog_buttonsOrder || 'OS',
  			dir = editor.lang.dir,
  			tabsToRemove = {},
  			i, processed, stopPropagation;
  
  		if ( ( buttonsOrder == 'OS' && CKEDITOR.env.mac ) || // The buttons in MacOS Apps are in reverse order (#4750)
  		( buttonsOrder == 'rtl' && dir == 'ltr' ) || ( buttonsOrder == 'ltr' && dir == 'rtl' ) )
  			defaultDefinition.buttons.reverse();
  
  
  		// Completes the definition with the default values.
  		definition = CKEDITOR.tools.extend( definition( editor ), defaultDefinition );
  
  		// Clone a functionally independent copy for this dialog.
  		definition = CKEDITOR.tools.clone( definition );
  
  		// Create a complex definition object, extending it with the API
  		// functions.
  		definition = new definitionObject( this, definition );
  
  		var themeBuilt = buildDialog( editor );
  
  		// Initialize some basic parameters.
  		this._ = {
  			editor: editor,
  			element: themeBuilt.element,
  			name: dialogName,
  			contentSize: { width: 0, height: 0 },
  			size: { width: 0, height: 0 },
  			contents: {},
  			buttons: {},
  			accessKeyMap: {},
  
  			// Initialize the tab and page map.
  			tabs: {},
  			tabIdList: [],
  			currentTabId: null,
  			currentTabIndex: null,
  			pageCount: 0,
  			lastTab: null,
  			tabBarMode: false,
  
  			// Initialize the tab order array for input widgets.
  			focusList: [],
  			currentFocusIndex: 0,
  			hasFocus: false
  		};
  
  		this.parts = themeBuilt.parts;
  
  		CKEDITOR.tools.setTimeout( function() {
  			editor.fire( 'ariaWidget', this.parts.contents );
  		}, 0, this );
  
  		// Set the startup styles for the dialog, avoiding it enlarging the
  		// page size on the dialog creation.
  		var startStyles = {
  			position: CKEDITOR.env.ie6Compat ? 'absolute' : 'fixed',
  			top: 0,
  			visibility: 'hidden'
  		};
  
  		startStyles[ dir == 'rtl' ? 'right' : 'left' ] = 0;
  		this.parts.dialog.setStyles( startStyles );
  
  
  		// Call the CKEDITOR.event constructor to initialize this instance.
  		CKEDITOR.event.call( this );
  
  		// Fire the "dialogDefinition" event, making it possible to customize
  		// the dialog definition.
  		this.definition = definition = CKEDITOR.fire( 'dialogDefinition', {
  			name: dialogName,
  			definition: definition
  		}, editor ).definition;
  
  		// Cache tabs that should be removed.
  		if ( !( 'removeDialogTabs' in editor._ ) && editor.config.removeDialogTabs ) {
  			var removeContents = editor.config.removeDialogTabs.split( ';' );
  
  			for ( i = 0; i < removeContents.length; i++ ) {
  				var parts = removeContents[ i ].split( ':' );
  				if ( parts.length == 2 ) {
  					var removeDialogName = parts[ 0 ];
  					if ( !tabsToRemove[ removeDialogName ] )
  						tabsToRemove[ removeDialogName ] = [];
  					tabsToRemove[ removeDialogName ].push( parts[ 1 ] );
  				}
  			}
  			editor._.removeDialogTabs = tabsToRemove;
  		}
  
  		// Remove tabs of this dialog.
  		if ( editor._.removeDialogTabs && ( tabsToRemove = editor._.removeDialogTabs[ dialogName ] ) ) {
  			for ( i = 0; i < tabsToRemove.length; i++ )
  				definition.removeContents( tabsToRemove[ i ] );
  		}
  
  		// Initialize load, show, hide, ok and cancel events.
  		if ( definition.onLoad )
  			this.on( 'load', definition.onLoad );
  
  		if ( definition.onShow )
  			this.on( 'show', definition.onShow );
  
  		if ( definition.onHide )
  			this.on( 'hide', definition.onHide );
  
  		if ( definition.onOk ) {
  			this.on( 'ok', function( evt ) {
  				// Dialog confirm might probably introduce content changes (#5415).
  				editor.fire( 'saveSnapshot' );
  				setTimeout( function() {
  					editor.fire( 'saveSnapshot' );
  				}, 0 );
  				if ( definition.onOk.call( this, evt ) === false )
  					evt.data.hide = false;
  			} );
  		}
  
  		// Set default dialog state.
  		this.state = CKEDITOR.DIALOG_STATE_IDLE;
  
  		if ( definition.onCancel ) {
  			this.on( 'cancel', function( evt ) {
  				if ( definition.onCancel.call( this, evt ) === false )
  					evt.data.hide = false;
  			} );
  		}
  
  		var me = this;
  
  		// Iterates over all items inside all content in the dialog, calling a
  		// function for each of them.
  		var iterContents = function( func ) {
  				var contents = me._.contents,
  					stop = false;
  
  				for ( var i in contents ) {
  					for ( var j in contents[ i ] ) {
  						stop = func.call( this, contents[ i ][ j ] );
  						if ( stop )
  							return;
  					}
  				}
  			};
  
  		this.on( 'ok', function( evt ) {
  			iterContents( function( item ) {
  				if ( item.validate ) {
  					var retval = item.validate( this ),
  						invalid = ( typeof retval == 'string' ) || retval === false;
  
  					if ( invalid ) {
  						evt.data.hide = false;
  						evt.stop();
  					}
  
  					handleFieldValidated.call( item, !invalid, typeof retval == 'string' ? retval : undefined );
  					return invalid;
  				}
  			} );
  		}, this, null, 0 );
  
  		this.on( 'cancel', function( evt ) {
  			iterContents( function( item ) {
  				if ( item.isChanged() ) {
  					if ( !editor.config.dialog_noConfirmCancel && !confirm( editor.lang.common.confirmCancel ) ) // jshint ignore:line
  						evt.data.hide = false;
  					return true;
  				}
  			} );
  		}, this, null, 0 );
  
  		this.parts.close.on( 'click', function( evt ) {
  			if ( this.fire( 'cancel', { hide: true } ).hide !== false )
  				this.hide();
  			evt.data.preventDefault();
  		}, this );
  
  		// Sort focus list according to tab order definitions.
  		function setupFocus() {
  			var focusList = me._.focusList;
  			focusList.sort( function( a, b ) {
  				// Mimics browser tab order logics;
  				if ( a.tabIndex != b.tabIndex )
  					return b.tabIndex - a.tabIndex;
  				//  Sort is not stable in some browsers,
  				// fall-back the comparator to 'focusIndex';
  				else
  					return a.focusIndex - b.focusIndex;
  			} );
  
  			var size = focusList.length;
  			for ( var i = 0; i < size; i++ )
  				focusList[ i ].focusIndex = i;
  		}
  
  		// Expects 1 or -1 as an offset, meaning direction of the offset change.
  		function changeFocus( offset ) {
  			var focusList = me._.focusList;
  			offset = offset || 0;
  
  			if ( focusList.length < 1 )
  				return;
  
  			var startIndex = me._.currentFocusIndex;
  
  			if ( me._.tabBarMode && offset < 0 ) {
  				// If we are in tab mode, we need to mimic that we started tabbing back from the first
  				// focusList (so it will go to the last one).
  				startIndex = 0;
  			}
  
  			// Trigger the 'blur' event of  any input element before anything,
  			// since certain UI updates may depend on it.
  			try {
  				focusList[ startIndex ].getInputElement().$.blur();
  			} catch ( e ) {}
  
  			var currentIndex = startIndex,
  				hasTabs = me._.pageCount > 1;
  
  			do {
  				currentIndex = currentIndex + offset;
  
  				if ( hasTabs && !me._.tabBarMode && ( currentIndex == focusList.length || currentIndex == -1 ) ) {
  					// If the dialog was not in tab mode, then focus the first tab (#13027).
  					me._.tabBarMode = true;
  					me._.tabs[ me._.currentTabId ][ 0 ].focus();
  					me._.currentFocusIndex = -1;
  
  					// Early return, in order to avoid accessing focusList[ -1 ].
  					return;
  				}
  
  				currentIndex = ( currentIndex + focusList.length ) % focusList.length;
  
  				if ( currentIndex == startIndex ) {
  					break;
  				}
  			} while ( offset && !focusList[ currentIndex ].isFocusable() );
  
  			focusList[ currentIndex ].focus();
  
  			// Select whole field content.
  			if ( focusList[ currentIndex ].type == 'text' )
  				focusList[ currentIndex ].select();
  		}
  
  		this.changeFocus = changeFocus;
  
  
  		function keydownHandler( evt ) {
  			// If I'm not the top dialog, ignore.
  			if ( me != CKEDITOR.dialog._.currentTop )
  				return;
  
  			var keystroke = evt.data.getKeystroke(),
  				rtl = editor.lang.dir == 'rtl',
  				arrowKeys = [ 37, 38, 39, 40 ],
  				button;
  
  			processed = stopPropagation = 0;
  
  			if ( keystroke == 9 || keystroke == CKEDITOR.SHIFT + 9 ) {
  				var shiftPressed = ( keystroke == CKEDITOR.SHIFT + 9 );
  				changeFocus( shiftPressed ? -1 : 1 );
  				processed = 1;
  			} else if ( keystroke == CKEDITOR.ALT + 121 && !me._.tabBarMode && me.getPageCount() > 1 ) {
  				// Alt-F10 puts focus into the current tab item in the tab bar.
  				me._.tabBarMode = true;
  				me._.tabs[ me._.currentTabId ][ 0 ].focus();
  				me._.currentFocusIndex = -1;
  				processed = 1;
  			} else if ( CKEDITOR.tools.indexOf( arrowKeys, keystroke ) != -1 && me._.tabBarMode ) {
  				// Array with key codes that activate previous tab.
  				var prevKeyCodes = [
  						// Depending on the lang dir: right or left key
  						rtl ? 39 : 37,
  						// Top/bot arrow: actually for both cases it's the same.
  						38
  					],
  					nextId = CKEDITOR.tools.indexOf( prevKeyCodes, keystroke ) != -1 ? getPreviousVisibleTab.call( me ) : getNextVisibleTab.call( me );
  
  				me.selectPage( nextId );
  				me._.tabs[ nextId ][ 0 ].focus();
  				processed = 1;
  			} else if ( ( keystroke == 13 || keystroke == 32 ) && me._.tabBarMode ) {
  				this.selectPage( this._.currentTabId );
  				this._.tabBarMode = false;
  				this._.currentFocusIndex = -1;
  				changeFocus( 1 );
  				processed = 1;
  			}
  			// If user presses enter key in a text box, it implies clicking OK for the dialog.
  			else if ( keystroke == 13 /*ENTER*/ ) {
  				// Don't do that for a target that handles ENTER.
  				var target = evt.data.getTarget();
  				if ( !target.is( 'a', 'button', 'select', 'textarea' ) && ( !target.is( 'input' ) || target.$.type != 'button' ) ) {
  					button = this.getButton( 'ok' );
  					button && CKEDITOR.tools.setTimeout( button.click, 0, button );
  					processed = 1;
  				}
  				stopPropagation = 1; // Always block the propagation (#4269)
  			} else if ( keystroke == 27 /*ESC*/ ) {
  				button = this.getButton( 'cancel' );
  
  				// If there's a Cancel button, click it, else just fire the cancel event and hide the dialog.
  				if ( button )
  					CKEDITOR.tools.setTimeout( button.click, 0, button );
  				else {
  					if ( this.fire( 'cancel', { hide: true } ).hide !== false )
  						this.hide();
  				}
  				stopPropagation = 1; // Always block the propagation (#4269)
  			} else {
  				return;
  			}
  
  			keypressHandler( evt );
  		}
  
  		function keypressHandler( evt ) {
  			if ( processed )
  				evt.data.preventDefault( 1 );
  			else if ( stopPropagation )
  				evt.data.stopPropagation();
  		}
  
  		var dialogElement = this._.element;
  
  		editor.focusManager.add( dialogElement, 1 );
  
  		// Add the dialog keyboard handlers.
  		this.on( 'show', function() {
  			dialogElement.on( 'keydown', keydownHandler, this );
  
  			// Some browsers instead, don't cancel key events in the keydown, but in the
  			// keypress. So we must do a longer trip in those cases. (#4531,#8985)
  			if ( CKEDITOR.env.gecko )
  				dialogElement.on( 'keypress', keypressHandler, this );
  
  		} );
  		this.on( 'hide', function() {
  			dialogElement.removeListener( 'keydown', keydownHandler );
  			if ( CKEDITOR.env.gecko )
  				dialogElement.removeListener( 'keypress', keypressHandler );
  
  			// Reset fields state when closing dialog.
  			iterContents( function( item ) {
  				resetField.apply( item );
  			} );
  		} );
  		this.on( 'iframeAdded', function( evt ) {
  			var doc = new CKEDITOR.dom.document( evt.data.iframe.$.contentWindow.document );
  			doc.on( 'keydown', keydownHandler, this, null, 0 );
  		} );
  
  		// Auto-focus logic in dialog.
  		this.on( 'show', function() {
  			// Setup tabIndex on showing the dialog instead of on loading
  			// to allow dynamic tab order happen in dialog definition.
  			setupFocus();
  
  			var hasTabs = me._.pageCount > 1;
  
  			if ( editor.config.dialog_startupFocusTab && hasTabs ) {
  				me._.tabBarMode = true;
  				me._.tabs[ me._.currentTabId ][ 0 ].focus();
  				me._.currentFocusIndex = -1;
  			} else if ( !this._.hasFocus ) {
  				// http://dev.ckeditor.com/ticket/13114#comment:4.
  				this._.currentFocusIndex = hasTabs ? -1 : this._.focusList.length - 1;
  
  				// Decide where to put the initial focus.
  				if ( definition.onFocus ) {
  					var initialFocus = definition.onFocus.call( this );
  					// Focus the field that the user specified.
  					initialFocus && initialFocus.focus();
  				}
  				// Focus the first field in layout order.
  				else {
  					changeFocus( 1 );
  				}
  			}
  		}, this, null, 0xffffffff );
  
  		// IE6 BUG: Text fields and text areas are only half-rendered the first time the dialog appears in IE6 (#2661).
  		// This is still needed after [2708] and [2709] because text fields in hidden TR tags are still broken.
  		if ( CKEDITOR.env.ie6Compat ) {
  			this.on( 'load', function() {
  				var outer = this.getElement(),
  					inner = outer.getFirst();
  				inner.remove();
  				inner.appendTo( outer );
  			}, this );
  		}
  
  		initDragAndDrop( this );
  		initResizeHandles( this );
  
  		// Insert the title.
  		( new CKEDITOR.dom.text( definition.title, CKEDITOR.document ) ).appendTo( this.parts.title );
  
  		// Insert the tabs and contents.
  		for ( i = 0; i < definition.contents.length; i++ ) {
  			var page = definition.contents[ i ];
  			page && this.addPage( page );
  		}
  
  		this.parts.tabs.on( 'click', function( evt ) {
  			var target = evt.data.getTarget();
  			// If we aren't inside a tab, bail out.
  			if ( target.hasClass( 'cke_dialog_tab' ) ) {
  				// Get the ID of the tab, without the 'cke_' prefix and the unique number suffix.
  				var id = target.$.id;
  				this.selectPage( id.substring( 4, id.lastIndexOf( '_' ) ) );
  
  				if ( this._.tabBarMode ) {
  					this._.tabBarMode = false;
  					this._.currentFocusIndex = -1;
  					changeFocus( 1 );
  				}
  				evt.data.preventDefault();
  			}
  		}, this );
  
  		// Insert buttons.
  		var buttonsHtml = [],
  			buttons = CKEDITOR.dialog._.uiElementBuilders.hbox.build( this, {
  				type: 'hbox',
  				className: 'cke_dialog_footer_buttons',
  				widths: [],
  				children: definition.buttons
  			}, buttonsHtml ).getChild();
  		this.parts.footer.setHtml( buttonsHtml.join( '' ) );
  
  		for ( i = 0; i < buttons.length; i++ )
  			this._.buttons[ buttons[ i ].id ] = buttons[ i ];
  
  		/**
  		 * Current state of the dialog. Use the {@link #setState} method to update it.
  		 * See the {@link #event-state} event to know more.
  		 *
  		 * @readonly
  		 * @property {Number} [state=CKEDITOR.DIALOG_STATE_IDLE]
  		 */
  	};
  
  	// Focusable interface. Use it via dialog.addFocusable.
  	function Focusable( dialog, element, index ) {
  		this.element = element;
  		this.focusIndex = index;
  		// TODO: support tabIndex for focusables.
  		this.tabIndex = 0;
  		this.isFocusable = function() {
  			return !element.getAttribute( 'disabled' ) && element.isVisible();
  		};
  		this.focus = function() {
  			dialog._.currentFocusIndex = this.focusIndex;
  			this.element.focus();
  		};
  		// Bind events
  		element.on( 'keydown', function( e ) {
  			if ( e.data.getKeystroke() in { 32: 1, 13: 1 } )
  				this.fire( 'click' );
  		} );
  		element.on( 'focus', function() {
  			this.fire( 'mouseover' );
  		} );
  		element.on( 'blur', function() {
  			this.fire( 'mouseout' );
  		} );
  	}
  
  	// Re-layout the dialog on window resize.
  	function resizeWithWindow( dialog ) {
  		var win = CKEDITOR.document.getWindow();
  		function resizeHandler() {
  			dialog.layout();
  		}
  		win.on( 'resize', resizeHandler );
  		dialog.on( 'hide', function() {
  			win.removeListener( 'resize', resizeHandler );
  		} );
  	}
  
  	CKEDITOR.dialog.prototype = {
  		destroy: function() {
  			this.hide();
  			this._.element.remove();
  		},
  
  		/**
  		 * Resizes the dialog.
  		 *
  		 *		dialogObj.resize( 800, 640 );
  		 *
  		 * @method
  		 * @param {Number} width The width of the dialog in pixels.
  		 * @param {Number} height The height of the dialog in pixels.
  		 */
  		resize: ( function() {
  			return function( width, height ) {
  				if ( this._.contentSize && this._.contentSize.width == width && this._.contentSize.height == height )
  					return;
  
  				CKEDITOR.dialog.fire( 'resize', {
  					dialog: this,
  					width: width,
  					height: height
  				}, this._.editor );
  
  				this.fire( 'resize', {
  					width: width,
  					height: height
  				}, this._.editor );
  
  				var contents = this.parts.contents;
  				contents.setStyles( {
  					width: width + 'px',
  					height: height + 'px'
  				} );
  
  				// Update dialog position when dimension get changed in RTL.
  				if ( this._.editor.lang.dir == 'rtl' && this._.position )
  					this._.position.x = CKEDITOR.document.getWindow().getViewPaneSize().width - this._.contentSize.width - parseInt( this._.element.getFirst().getStyle( 'right' ), 10 );
  
  				this._.contentSize = { width: width, height: height };
  			};
  		} )(),
  
  		/**
  		 * Gets the current size of the dialog in pixels.
  		 *
  		 * var width = dialogObj.getSize().width;
  		 *
  		 * @returns {Object}
  		 * @returns {Number} return.width
  		 * @returns {Number} return.height
  		 */
  		getSize: function() {
  			var element = this._.element.getFirst();
  			return { width: element.$.offsetWidth || 0, height: element.$.offsetHeight || 0 };
  		},
  
  		/**
  		 * Moves the dialog to an `(x, y)` coordinate relative to the window.
  		 *
  		 * dialogObj.move( 10, 40 );
  		 *
  		 * @method
  		 * @param {Number} x The target x-coordinate.
  		 * @param {Number} y The target y-coordinate.
  		 * @param {Boolean} save Flag indicate whether the dialog position should be remembered on next open up.
  		 */
  		move: function( x, y, save ) {
  
  			// The dialog may be fixed positioned or absolute positioned. Ask the
  			// browser what is the current situation first.
  			var element = this._.element.getFirst(), rtl = this._.editor.lang.dir == 'rtl';
  			var isFixed = element.getComputedStyle( 'position' ) == 'fixed';
  
  			// (#8888) In some cases of a very small viewport, dialog is incorrectly
  			// positioned in IE7. It also happens that it remains sticky and user cannot
  			// scroll down/up to reveal dialog's content below/above the viewport; this is
  			// cumbersome.
  			// The only way to fix this is to move mouse out of the browser and
  			// go back to see that dialog position is automagically fixed. No events,
  			// no style change - pure magic. This is a IE7 rendering issue, which can be
  			// fixed with dummy style redraw on each move.
  			if ( CKEDITOR.env.ie )
  				element.setStyle( 'zoom', '100%' );
  
  			if ( isFixed && this._.position && this._.position.x == x && this._.position.y == y )
  				return;
  
  			// Save the current position.
  			this._.position = { x: x, y: y };
  
  			// If not fixed positioned, add scroll position to the coordinates.
  			if ( !isFixed ) {
  				var scrollPosition = CKEDITOR.document.getWindow().getScrollPosition();
  				x += scrollPosition.x;
  				y += scrollPosition.y;
  			}
  
  			// Translate coordinate for RTL.
  			if ( rtl ) {
  				var dialogSize = this.getSize(), viewPaneSize = CKEDITOR.document.getWindow().getViewPaneSize();
  				x = viewPaneSize.width - dialogSize.width - x;
  			}
  
  			var styles = { 'top': ( y > 0 ? y : 0 ) + 'px' };
  			styles[ rtl ? 'right' : 'left' ] = ( x > 0 ? x : 0 ) + 'px';
  
  			element.setStyles( styles );
  
  			save && ( this._.moved = 1 );
  		},
  
  		/**
  		 * Gets the dialog's position in the window.
  		 *
  		 *		var dialogX = dialogObj.getPosition().x;
  		 *
  		 * @returns {Object}
  		 * @returns {Number} return.x
  		 * @returns {Number} return.y
  		 */
  		getPosition: function() {
  			return CKEDITOR.tools.extend( {}, this._.position );
  		},
  
  		/**
  		 * Shows the dialog box.
  		 *
  		 *		dialogObj.show();
  		 */
  		show: function() {
  			// Insert the dialog's element to the root document.
  			var element = this._.element;
  			var definition = this.definition;
  			if ( !( element.getParent() && element.getParent().equals( CKEDITOR.document.getBody() ) ) )
  				element.appendTo( CKEDITOR.document.getBody() );
  			else
  				element.setStyle( 'display', 'block' );
  
  			// First, set the dialog to an appropriate size.
  			this.resize(
  				this._.contentSize && this._.contentSize.width || definition.width || definition.minWidth,
  				this._.contentSize && this._.contentSize.height || definition.height || definition.minHeight
  			);
  
  			// Reset all inputs back to their default value.
  			this.reset();
  
  			// Select the first tab by default.
  			this.selectPage( this.definition.contents[ 0 ].id );
  
  			// Set z-index.
  			if ( CKEDITOR.dialog._.currentZIndex === null )
  				CKEDITOR.dialog._.currentZIndex = this._.editor.config.baseFloatZIndex;
  			this._.element.getFirst().setStyle( 'z-index', CKEDITOR.dialog._.currentZIndex += 10 );
  
  			// Maintain the dialog ordering and dialog cover.
  			if ( CKEDITOR.dialog._.currentTop === null ) {
  				CKEDITOR.dialog._.currentTop = this;
  				this._.parentDialog = null;
  				showCover( this._.editor );
  
  			} else {
  				this._.parentDialog = CKEDITOR.dialog._.currentTop;
  				var parentElement = this._.parentDialog.getElement().getFirst();
  				parentElement.$.style.zIndex -= Math.floor( this._.editor.config.baseFloatZIndex / 2 );
  				CKEDITOR.dialog._.currentTop = this;
  			}
  
  			element.on( 'keydown', accessKeyDownHandler );
  			element.on( 'keyup', accessKeyUpHandler );
  
  			// Reset the hasFocus state.
  			this._.hasFocus = false;
  
  			for ( var i in definition.contents ) {
  				if ( !definition.contents[ i ] )
  					continue;
  
  				var content = definition.contents[ i ],
  					tab = this._.tabs[ content.id ],
  					requiredContent = content.requiredContent,
  					enableElements = 0;
  
  				if ( !tab )
  					continue;
  
  				for ( var j in this._.contents[ content.id ] ) {
  					var elem = this._.contents[ content.id ][ j ];
  
  					if ( elem.type == 'hbox' || elem.type == 'vbox' || !elem.getInputElement() )
  						continue;
  
  					if ( elem.requiredContent && !this._.editor.activeFilter.check( elem.requiredContent ) )
  						elem.disable();
  					else {
  						elem.enable();
  						enableElements++;
  					}
  				}
  
  				if ( !enableElements || ( requiredContent && !this._.editor.activeFilter.check( requiredContent ) ) )
  					tab[ 0 ].addClass( 'cke_dialog_tab_disabled' );
  				else
  					tab[ 0 ].removeClass( 'cke_dialog_tab_disabled' );
  			}
  
  			CKEDITOR.tools.setTimeout( function() {
  				this.layout();
  				resizeWithWindow( this );
  
  				this.parts.dialog.setStyle( 'visibility', '' );
  
  				// Execute onLoad for the first show.
  				this.fireOnce( 'load', {} );
  				CKEDITOR.ui.fire( 'ready', this );
  
  				this.fire( 'show', {} );
  				this._.editor.fire( 'dialogShow', this );
  
  				if ( !this._.parentDialog )
  					this._.editor.focusManager.lock();
  
  				// Save the initial values of the dialog.
  				this.foreach( function( contentObj ) {
  					contentObj.setInitValue && contentObj.setInitValue();
  				} );
  
  			}, 100, this );
  		},
  
  		/**
  		 * Rearrange the dialog to its previous position or the middle of the window.
  		 *
  		 * @since 3.5
  		 */
  		layout: function() {
  			var el = this.parts.dialog;
  			var dialogSize = this.getSize();
  			var win = CKEDITOR.document.getWindow(),
  					viewSize = win.getViewPaneSize();
  
  			var posX = ( viewSize.width - dialogSize.width ) / 2,
  				posY = ( viewSize.height - dialogSize.height ) / 2;
  
  			// Switch to absolute position when viewport is smaller than dialog size.
  			if ( !CKEDITOR.env.ie6Compat ) {
  				if ( dialogSize.height + ( posY > 0 ? posY : 0 ) > viewSize.height || dialogSize.width + ( posX > 0 ? posX : 0 ) > viewSize.width ) {
  					el.setStyle( 'position', 'absolute' );
  				} else {
  					el.setStyle( 'position', 'fixed' );
  				}
  			}
  
  			this.move( this._.moved ? this._.position.x : posX, this._.moved ? this._.position.y : posY );
  		},
  
  		/**
  		 * Executes a function for each UI element.
  		 *
  		 * @param {Function} fn Function to execute for each UI element.
  		 * @returns {CKEDITOR.dialog} The current dialog object.
  		 */
  		foreach: function( fn ) {
  			for ( var i in this._.contents ) {
  				for ( var j in this._.contents[ i ] ) {
  					fn.call( this, this._.contents[i][j] );
  				}
  			}
  
  			return this;
  		},
  
  		/**
  		 * Resets all input values in the dialog.
  		 *
  		 *		dialogObj.reset();
  		 *
  		 * @method
  		 * @chainable
  		 */
  		reset: ( function() {
  			var fn = function( widget ) {
  					if ( widget.reset )
  						widget.reset( 1 );
  				};
  			return function() {
  				this.foreach( fn );
  				return this;
  			};
  		} )(),
  
  
  		/**
  		 * Calls the {@link CKEDITOR.dialog.definition.uiElement#setup} method of each
  		 * of the UI elements, with the arguments passed through it.
  		 * It is usually being called when the dialog is opened, to put the initial value inside the field.
  		 *
  		 *		dialogObj.setupContent();
  		 *
  		 *		var timestamp = ( new Date() ).valueOf();
  		 *		dialogObj.setupContent( timestamp );
  		 */
  		setupContent: function() {
  			var args = arguments;
  			this.foreach( function( widget ) {
  				if ( widget.setup )
  					widget.setup.apply( widget, args );
  			} );
  		},
  
  		/**
  		 * Calls the {@link CKEDITOR.dialog.definition.uiElement#commit} method of each
  		 * of the UI elements, with the arguments passed through it.
  		 * It is usually being called when the user confirms the dialog, to process the values.
  		 *
  		 *		dialogObj.commitContent();
  		 *
  		 *		var timestamp = ( new Date() ).valueOf();
  		 *		dialogObj.commitContent( timestamp );
  		 */
  		commitContent: function() {
  			var args = arguments;
  			this.foreach( function( widget ) {
  				// Make sure IE triggers "change" event on last focused input before closing the dialog. (#7915)
  				if ( CKEDITOR.env.ie && this._.currentFocusIndex == widget.focusIndex )
  					widget.getInputElement().$.blur();
  
  				if ( widget.commit )
  					widget.commit.apply( widget, args );
  			} );
  		},
  
  		/**
  		 * Hides the dialog box.
  		 *
  		 *		dialogObj.hide();
  		 */
  		hide: function() {
  			if ( !this.parts.dialog.isVisible() )
  				return;
  
  			this.fire( 'hide', {} );
  			this._.editor.fire( 'dialogHide', this );
  			// Reset the tab page.
  			this.selectPage( this._.tabIdList[ 0 ] );
  			var element = this._.element;
  			element.setStyle( 'display', 'none' );
  			this.parts.dialog.setStyle( 'visibility', 'hidden' );
  			// Unregister all access keys associated with this dialog.
  			unregisterAccessKey( this );
  
  			// Close any child(top) dialogs first.
  			while ( CKEDITOR.dialog._.currentTop != this )
  				CKEDITOR.dialog._.currentTop.hide();
  
  			// Maintain dialog ordering and remove cover if needed.
  			if ( !this._.parentDialog )
  				hideCover( this._.editor );
  			else {
  				var parentElement = this._.parentDialog.getElement().getFirst();
  				parentElement.setStyle( 'z-index', parseInt( parentElement.$.style.zIndex, 10 ) + Math.floor( this._.editor.config.baseFloatZIndex / 2 ) );
  			}
  			CKEDITOR.dialog._.currentTop = this._.parentDialog;
  
  			// Deduct or clear the z-index.
  			if ( !this._.parentDialog ) {
  				CKEDITOR.dialog._.currentZIndex = null;
  
  				// Remove access key handlers.
  				element.removeListener( 'keydown', accessKeyDownHandler );
  				element.removeListener( 'keyup', accessKeyUpHandler );
  
  				var editor = this._.editor;
  				editor.focus();
  
  				// Give a while before unlock, waiting for focus to return to the editable. (#172)
  				setTimeout( function() {
  					editor.focusManager.unlock();
  
  					// Fixed iOS focus issue (#12381).
  					// Keep in mind that editor.focus() does not work in this case.
  					if ( CKEDITOR.env.iOS ) {
  						editor.window.focus();
  					}
  				}, 0 );
  
  			} else {
  				CKEDITOR.dialog._.currentZIndex -= 10;
  			}
  
  			delete this._.parentDialog;
  			// Reset the initial values of the dialog.
  			this.foreach( function( contentObj ) {
  				contentObj.resetInitValue && contentObj.resetInitValue();
  			} );
  
  			// Reset dialog state back to IDLE, if busy (#13213).
  			this.setState( CKEDITOR.DIALOG_STATE_IDLE );
  		},
  
  		/**
  		 * Adds a tabbed page into the dialog.
  		 *
  		 * @param {Object} contents Content definition.
  		 */
  		addPage: function( contents ) {
  			if ( contents.requiredContent && !this._.editor.filter.check( contents.requiredContent ) )
  				return;
  
  			var pageHtml = [],
  				titleHtml = contents.label ? ' title="' + CKEDITOR.tools.htmlEncode( contents.label ) + '"' : '',
  				vbox = CKEDITOR.dialog._.uiElementBuilders.vbox.build( this, {
  					type: 'vbox',
  					className: 'cke_dialog_page_contents',
  					children: contents.elements,
  					expand: !!contents.expand,
  					padding: contents.padding,
  					style: contents.style || 'width: 100%;'
  				}, pageHtml );
  
  			var contentMap = this._.contents[ contents.id ] = {},
  				cursor,
  				children = vbox.getChild(),
  				enabledFields = 0;
  
  			while ( ( cursor = children.shift() ) ) {
  				// Count all allowed fields.
  				if ( !cursor.notAllowed && cursor.type != 'hbox' && cursor.type != 'vbox' )
  					enabledFields++;
  
  				contentMap[ cursor.id ] = cursor;
  				if ( typeof cursor.getChild == 'function' )
  					children.push.apply( children, cursor.getChild() );
  			}
  
  			// If all fields are disabled (because they are not allowed) hide this tab.
  			if ( !enabledFields )
  				contents.hidden = true;
  
  			// Create the HTML for the tab and the content block.
  			var page = CKEDITOR.dom.element.createFromHtml( pageHtml.join( '' ) );
  			page.setAttribute( 'role', 'tabpanel' );
  
  			var env = CKEDITOR.env;
  			var tabId = 'cke_' + contents.id + '_' + CKEDITOR.tools.getNextNumber(),
  				tab = CKEDITOR.dom.element.createFromHtml( [
  					'<a class="cke_dialog_tab"',
  					( this._.pageCount > 0 ? ' cke_last' : 'cke_first' ),
  					titleHtml,
  					( !!contents.hidden ? ' style="display:none"' : '' ),
  					' id="', tabId, '"',
  					env.gecko && !env.hc ? '' : ' href="javascript:void(0)"',
  					' tabIndex="-1"',
  					' hidefocus="true"',
  					' role="tab">',
  					contents.label,
  					'</a>'
  				].join( '' ) );
  
  			page.setAttribute( 'aria-labelledby', tabId );
  
  			// Take records for the tabs and elements created.
  			this._.tabs[ contents.id ] = [ tab, page ];
  			this._.tabIdList.push( contents.id );
  			!contents.hidden && this._.pageCount++;
  			this._.lastTab = tab;
  			this.updateStyle();
  
  			// Attach the DOM nodes.
  
  			page.setAttribute( 'name', contents.id );
  			page.appendTo( this.parts.contents );
  
  			tab.unselectable();
  			this.parts.tabs.append( tab );
  
  			// Add access key handlers if access key is defined.
  			if ( contents.accessKey ) {
  				registerAccessKey( this, this, 'CTRL+' + contents.accessKey, tabAccessKeyDown, tabAccessKeyUp );
  				this._.accessKeyMap[ 'CTRL+' + contents.accessKey ] = contents.id;
  			}
  		},
  
  		/**
  		 * Activates a tab page in the dialog by its id.
  		 *
  		 *		dialogObj.selectPage( 'tab_1' );
  		 *
  		 * @param {String} id The id of the dialog tab to be activated.
  		 */
  		selectPage: function( id ) {
  			if ( this._.currentTabId == id )
  				return;
  
  			if ( this._.tabs[ id ][ 0 ].hasClass( 'cke_dialog_tab_disabled' ) )
  				return;
  
  			// If event was canceled - do nothing.
  			if ( this.fire( 'selectPage', { page: id, currentPage: this._.currentTabId } ) === false )
  				return;
  
  			// Hide the non-selected tabs and pages.
  			for ( var i in this._.tabs ) {
  				var tab = this._.tabs[ i ][ 0 ],
  					page = this._.tabs[ i ][ 1 ];
  				if ( i != id ) {
  					tab.removeClass( 'cke_dialog_tab_selected' );
  					page.hide();
  				}
  				page.setAttribute( 'aria-hidden', i != id );
  			}
  
  			var selected = this._.tabs[ id ];
  			selected[ 0 ].addClass( 'cke_dialog_tab_selected' );
  
  			// [IE] an invisible input[type='text'] will enlarge it's width
  			// if it's value is long when it shows, so we clear it's value
  			// before it shows and then recover it (#5649)
  			if ( CKEDITOR.env.ie6Compat || CKEDITOR.env.ie7Compat ) {
  				clearOrRecoverTextInputValue( selected[ 1 ] );
  				selected[ 1 ].show();
  				setTimeout( function() {
  					clearOrRecoverTextInputValue( selected[ 1 ], 1 );
  				}, 0 );
  			} else {
  				selected[ 1 ].show();
  			}
  
  			this._.currentTabId = id;
  			this._.currentTabIndex = CKEDITOR.tools.indexOf( this._.tabIdList, id );
  		},
  
  		/**
  		 * Dialog state-specific style updates.
  		 */
  		updateStyle: function() {
  			// If only a single page shown, a different style is used in the central pane.
  			this.parts.dialog[ ( this._.pageCount === 1 ? 'add' : 'remove' ) + 'Class' ]( 'cke_single_page' );
  		},
  
  		/**
  		 * Hides a page's tab away from the dialog.
  		 *
  		 *		dialog.hidePage( 'tab_3' );
  		 *
  		 * @param {String} id The page's Id.
  		 */
  		hidePage: function( id ) {
  			var tab = this._.tabs[ id ] && this._.tabs[ id ][ 0 ];
  			if ( !tab || this._.pageCount == 1 || !tab.isVisible() )
  				return;
  			// Switch to other tab first when we're hiding the active tab.
  			else if ( id == this._.currentTabId )
  				this.selectPage( getPreviousVisibleTab.call( this ) );
  
  			tab.hide();
  			this._.pageCount--;
  			this.updateStyle();
  		},
  
  		/**
  		 * Unhides a page's tab.
  		 *
  		 *		dialog.showPage( 'tab_2' );
  		 *
  		 * @param {String} id The page's Id.
  		 */
  		showPage: function( id ) {
  			var tab = this._.tabs[ id ] && this._.tabs[ id ][ 0 ];
  			if ( !tab )
  				return;
  			tab.show();
  			this._.pageCount++;
  			this.updateStyle();
  		},
  
  		/**
  		 * Gets the root DOM element of the dialog.
  		 *
  		 *		var dialogElement = dialogObj.getElement().getFirst();
  		 *		dialogElement.setStyle( 'padding', '5px' );
  		 *
  		 * @returns {CKEDITOR.dom.element} The `<span>` element containing this dialog.
  		 */
  		getElement: function() {
  			return this._.element;
  		},
  
  		/**
  		 * Gets the name of the dialog.
  		 *
  		 *		var dialogName = dialogObj.getName();
  		 *
  		 * @returns {String} The name of this dialog.
  		 */
  		getName: function() {
  			return this._.name;
  		},
  
  		/**
  		 * Gets a dialog UI element object from a dialog page.
  		 *
  		 *		dialogObj.getContentElement( 'tabId', 'elementId' ).setValue( 'Example' );
  		 *
  		 * @param {String} pageId id of dialog page.
  		 * @param {String} elementId id of UI element.
  		 * @returns {CKEDITOR.ui.dialog.uiElement} The dialog UI element.
  		 */
  		getContentElement: function( pageId, elementId ) {
  			var page = this._.contents[ pageId ];
  			return page && page[ elementId ];
  		},
  
  		/**
  		 * Gets the value of a dialog UI element.
  		 *
  		 *		alert( dialogObj.getValueOf( 'tabId', 'elementId' ) );
  		 *
  		 * @param {String} pageId id of dialog page.
  		 * @param {String} elementId id of UI element.
  		 * @returns {Object} The value of the UI element.
  		 */
  		getValueOf: function( pageId, elementId ) {
  			return this.getContentElement( pageId, elementId ).getValue();
  		},
  
  		/**
  		 * Sets the value of a dialog UI element.
  		 *
  		 *		dialogObj.setValueOf( 'tabId', 'elementId', 'Example' );
  		 *
  		 * @param {String} pageId id of the dialog page.
  		 * @param {String} elementId id of the UI element.
  		 * @param {Object} value The new value of the UI element.
  		 */
  		setValueOf: function( pageId, elementId, value ) {
  			return this.getContentElement( pageId, elementId ).setValue( value );
  		},
  
  		/**
  		 * Gets the UI element of a button in the dialog's button row.
  		 *
  		 *		@returns {CKEDITOR.ui.dialog.button} The button object.
  		 *
  		 * @param {String} id The id of the button.
  		 */
  		getButton: function( id ) {
  			return this._.buttons[ id ];
  		},
  
  		/**
  		 * Simulates a click to a dialog button in the dialog's button row.
  		 *
  		 * @returns The return value of the dialog's `click` event.
  		 *
  		 * @param {String} id The id of the button.
  		 */
  		click: function( id ) {
  			return this._.buttons[ id ].click();
  		},
  
  		/**
  		 * Disables a dialog button.
  		 *
  		 * @param {String} id The id of the button.
  		 */
  		disableButton: function( id ) {
  			return this._.buttons[ id ].disable();
  		},
  
  		/**
  		 * Enables a dialog button.
  		 *
  		 * @param {String} id The id of the button.
  		 */
  		enableButton: function( id ) {
  			return this._.buttons[ id ].enable();
  		},
  
  		/**
  		 * Gets the number of pages in the dialog.
  		 *
  		 * @returns {Number} Page count.
  		 */
  		getPageCount: function() {
  			return this._.pageCount;
  		},
  
  		/**
  		 * Gets the editor instance which opened this dialog.
  		 *
  		 * @returns {CKEDITOR.editor} Parent editor instances.
  		 */
  		getParentEditor: function() {
  			return this._.editor;
  		},
  
  		/**
  		 * Gets the element that was selected when opening the dialog, if any.
  		 *
  		 * @returns {CKEDITOR.dom.element} The element that was selected, or `null`.
  		 */
  		getSelectedElement: function() {
  			return this.getParentEditor().getSelection().getSelectedElement();
  		},
  
  		/**
  		 * Adds element to dialog's focusable list.
  		 *
  		 * @param {CKEDITOR.dom.element} element
  		 * @param {Number} [index]
  		 */
  		addFocusable: function( element, index ) {
  			if ( typeof index == 'undefined' ) {
  				index = this._.focusList.length;
  				this._.focusList.push( new Focusable( this, element, index ) );
  			} else {
  				this._.focusList.splice( index, 0, new Focusable( this, element, index ) );
  				for ( var i = index + 1; i < this._.focusList.length; i++ )
  					this._.focusList[ i ].focusIndex++;
  			}
  		},
  
  		/**
  		 * Sets the dialog {@link #property-state}.
  		 *
  		 * @since 4.5
  		 * @param {Number} state Either {@link CKEDITOR#DIALOG_STATE_IDLE} or {@link CKEDITOR#DIALOG_STATE_BUSY}.
  		 */
  		setState: function( state ) {
  			var oldState = this.state;
  
  			if ( oldState == state ) {
  				return;
  			}
  
  			this.state = state;
  
  			if ( state == CKEDITOR.DIALOG_STATE_BUSY ) {
  				// Insert the spinner on demand.
  				if ( !this.parts.spinner ) {
  					this.parts.spinner = CKEDITOR.document.createElement( 'div', {
  						attributes: {
  							'class': 'cke_dialog_spinner'
  						},
  						styles: {
  							'float': 'left',
  							'margin-right': '8px'
  						}
  					} );
  
  					this.parts.spinner.setHtml( '&#8987;' );
  					this.parts.spinner.appendTo( this.parts.title, 1 );
  				}
  
  				// Finally, show the spinner.
  				this.parts.spinner.show();
  
  				this.getButton( 'ok' ).disable();
  			} else if ( state == CKEDITOR.DIALOG_STATE_IDLE ) {
  				// Hide the spinner. But don't do anything if there is no spinner yet.
  				this.parts.spinner && this.parts.spinner.hide();
  
  				this.getButton( 'ok' ).enable();
  			}
  
  			this.fire( 'state', state );
  		}
  	};
  
  	CKEDITOR.tools.extend( CKEDITOR.dialog, {
  		/**
  		 * Registers a dialog.
  		 *
  		 *		// Full sample plugin, which does not only register a dialog window but also adds an item to the context menu.
  		 *		// To open the dialog window, choose "Open dialog" in the context menu.
  		 *		CKEDITOR.plugins.add( 'myplugin', {
  		 *			init: function( editor ) {
  		 *				editor.addCommand( 'mydialog',new CKEDITOR.dialogCommand( 'mydialog' ) );
  		 *
  		 *				if ( editor.contextMenu ) {
  		 *					editor.addMenuGroup( 'mygroup', 10 );
  		 *					editor.addMenuItem( 'My Dialog', {
  		 *						label: 'Open dialog',
  		 *						command: 'mydialog',
  		 *						group: 'mygroup'
  		 *					} );
  		 *					editor.contextMenu.addListener( function( element ) {
  		 *						return { 'My Dialog': CKEDITOR.TRISTATE_OFF };
  		 *					} );
  		 *				}
  		 *
  		 *				CKEDITOR.dialog.add( 'mydialog', function( api ) {
  		 *					// CKEDITOR.dialog.definition
  		 *					var dialogDefinition = {
  		 *						title: 'Sample dialog',
  		 *						minWidth: 390,
  		 *						minHeight: 130,
  		 *						contents: [
  		 *							{
  		 *								id: 'tab1',
  		 *								label: 'Label',
  		 *								title: 'Title',
  		 *								expand: true,
  		 *								padding: 0,
  		 *								elements: [
  		 *									{
  		 *										type: 'html',
  		 *										html: '<p>This is some sample HTML content.</p>'
  		 *									},
  		 *									{
  		 *										type: 'textarea',
  		 *										id: 'textareaId',
  		 *										rows: 4,
  		 *										cols: 40
  		 *									}
  		 *								]
  		 *							}
  		 *						],
  		 *						buttons: [ CKEDITOR.dialog.okButton, CKEDITOR.dialog.cancelButton ],
  		 *						onOk: function() {
  		 *							// "this" is now a CKEDITOR.dialog object.
  		 *							// Accessing dialog elements:
  		 *							var textareaObj = this.getContentElement( 'tab1', 'textareaId' );
  		 *							alert( "You have entered: " + textareaObj.getValue() );
  		 *						}
  		 *					};
  		 *
  		 *					return dialogDefinition;
  		 *				} );
  		 *			}
  		 *		} );
  		 *
  		 *		CKEDITOR.replace( 'editor1', { extraPlugins: 'myplugin' } );
  		 *
  		 * @static
  		 * @param {String} name The dialog's name.
  		 * @param {Function/String} dialogDefinition
  		 * A function returning the dialog's definition, or the URL to the `.js` file holding the function.
  		 * The function should accept an argument `editor` which is the current editor instance, and
  		 * return an object conforming to {@link CKEDITOR.dialog.definition}.
  		 * @see CKEDITOR.dialog.definition
  		 */
  		add: function( name, dialogDefinition ) {
  			// Avoid path registration from multiple instances override definition.
  			if ( !this._.dialogDefinitions[ name ] || typeof dialogDefinition == 'function' )
  				this._.dialogDefinitions[ name ] = dialogDefinition;
  		},
  
  		/**
  		 * @static
  		 * @todo
  		 */
  		exists: function( name ) {
  			return !!this._.dialogDefinitions[ name ];
  		},
  
  		/**
  		 * @static
  		 * @todo
  		 */
  		getCurrent: function() {
  			return CKEDITOR.dialog._.currentTop;
  		},
  
  		/**
  		 * Check whether tab wasn't removed by {@link CKEDITOR.config#removeDialogTabs}.
  		 *
  		 * @since 4.1
  		 * @static
  		 * @param {CKEDITOR.editor} editor
  		 * @param {String} dialogName
  		 * @param {String} tabName
  		 * @returns {Boolean}
  		 */
  		isTabEnabled: function( editor, dialogName, tabName ) {
  			var cfg = editor.config.removeDialogTabs;
  
  			return !( cfg && cfg.match( new RegExp( '(?:^|;)' + dialogName + ':' + tabName + '(?:$|;)', 'i' ) ) );
  		},
  
  		/**
  		 * The default OK button for dialogs. Fires the `ok` event and closes the dialog if the event succeeds.
  		 *
  		 * @static
  		 * @method
  		 */
  		okButton: ( function() {
  			var retval = function( editor, override ) {
  					override = override || {};
  					return CKEDITOR.tools.extend( {
  						id: 'ok',
  						type: 'button',
  						label: editor.lang.common.ok,
  						'class': 'cke_dialog_ui_button_ok',
  						onClick: function( evt ) {
  							var dialog = evt.data.dialog;
  							if ( dialog.fire( 'ok', { hide: true } ).hide !== false )
  								dialog.hide();
  						}
  					}, override, true );
  				};
  			retval.type = 'button';
  			retval.override = function( override ) {
  				return CKEDITOR.tools.extend( function( editor ) {
  					return retval( editor, override );
  				}, { type: 'button' }, true );
  			};
  			return retval;
  		} )(),
  
  		/**
  		 * The default cancel button for dialogs. Fires the `cancel` event and
  		 * closes the dialog if no UI element value changed.
  		 *
  		 * @static
  		 * @method
  		 */
  		cancelButton: ( function() {
  			var retval = function( editor, override ) {
  					override = override || {};
  					return CKEDITOR.tools.extend( {
  						id: 'cancel',
  						type: 'button',
  						label: editor.lang.common.cancel,
  						'class': 'cke_dialog_ui_button_cancel',
  						onClick: function( evt ) {
  							var dialog = evt.data.dialog;
  							if ( dialog.fire( 'cancel', { hide: true } ).hide !== false )
  								dialog.hide();
  						}
  					}, override, true );
  				};
  			retval.type = 'button';
  			retval.override = function( override ) {
  				return CKEDITOR.tools.extend( function( editor ) {
  					return retval( editor, override );
  				}, { type: 'button' }, true );
  			};
  			return retval;
  		} )(),
  
  		/**
  		 * Registers a dialog UI element.
  		 *
  		 * @static
  		 * @param {String} typeName The name of the UI element.
  		 * @param {Function} builder The function to build the UI element.
  		 */
  		addUIElement: function( typeName, builder ) {
  			this._.uiElementBuilders[ typeName ] = builder;
  		}
  	} );
  
  	CKEDITOR.dialog._ = {
  		uiElementBuilders: {},
  
  		dialogDefinitions: {},
  
  		currentTop: null,
  
  		currentZIndex: null
  	};
  
  	// "Inherit" (copy actually) from CKEDITOR.event.
  	CKEDITOR.event.implementOn( CKEDITOR.dialog );
  	CKEDITOR.event.implementOn( CKEDITOR.dialog.prototype );
  
  	var defaultDialogDefinition = {
  		resizable: CKEDITOR.DIALOG_RESIZE_BOTH,
  		minWidth: 600,
  		minHeight: 400,
  		buttons: [ CKEDITOR.dialog.okButton, CKEDITOR.dialog.cancelButton ]
  	};
  
  	// Tool function used to return an item from an array based on its id
  	// property.
  	var getById = function( array, id, recurse ) {
  			for ( var i = 0, item;
  			( item = array[ i ] ); i++ ) {
  				if ( item.id == id )
  					return item;
  				if ( recurse && item[ recurse ] ) {
  					var retval = getById( item[ recurse ], id, recurse );
  					if ( retval )
  						return retval;
  				}
  			}
  			return null;
  		};
  
  	// Tool function used to add an item into an array.
  	var addById = function( array, newItem, nextSiblingId, recurse, nullIfNotFound ) {
  			if ( nextSiblingId ) {
  				for ( var i = 0, item;
  				( item = array[ i ] ); i++ ) {
  					if ( item.id == nextSiblingId ) {
  						array.splice( i, 0, newItem );
  						return newItem;
  					}
  
  					if ( recurse && item[ recurse ] ) {
  						var retval = addById( item[ recurse ], newItem, nextSiblingId, recurse, true );
  						if ( retval )
  							return retval;
  					}
  				}
  
  				if ( nullIfNotFound )
  					return null;
  			}
  
  			array.push( newItem );
  			return newItem;
  		};
  
  	// Tool function used to remove an item from an array based on its id.
  	var removeById = function( array, id, recurse ) {
  			for ( var i = 0, item;
  			( item = array[ i ] ); i++ ) {
  				if ( item.id == id )
  					return array.splice( i, 1 );
  				if ( recurse && item[ recurse ] ) {
  					var retval = removeById( item[ recurse ], id, recurse );
  					if ( retval )
  						return retval;
  				}
  			}
  			return null;
  		};
  
  	/**
  	 * This class is not really part of the API. It is the `definition` property value
  	 * passed to `dialogDefinition` event handlers.
  	 *
  	 *		CKEDITOR.on( 'dialogDefinition', function( evt ) {
  	 *			var definition = evt.data.definition;
  	 *			var content = definition.getContents( 'page1' );
  	 * 			// ...
  	 *		} );
  	 *
  	 * @private
  	 * @class CKEDITOR.dialog.definitionObject
  	 * @extends CKEDITOR.dialog.definition
  	 * @constructor Creates a definitionObject class instance.
  	 */
  	var definitionObject = function( dialog, dialogDefinition ) {
  			// TODO : Check if needed.
  			this.dialog = dialog;
  
  			// Transform the contents entries in contentObjects.
  			var contents = dialogDefinition.contents;
  			for ( var i = 0, content;
  			( content = contents[ i ] ); i++ )
  				contents[ i ] = content && new contentObject( dialog, content );
  
  			CKEDITOR.tools.extend( this, dialogDefinition );
  		};
  
  	definitionObject.prototype = {
  		/**
  		 * Gets a content definition.
  		 *
  		 * @param {String} id The id of the content definition.
  		 * @returns {CKEDITOR.dialog.definition.content} The content definition matching id.
  		 */
  		getContents: function( id ) {
  			return getById( this.contents, id );
  		},
  
  		/**
  		 * Gets a button definition.
  		 *
  		 * @param {String} id The id of the button definition.
  		 * @returns {CKEDITOR.dialog.definition.button} The button definition matching id.
  		 */
  		getButton: function( id ) {
  			return getById( this.buttons, id );
  		},
  
  		/**
  		 * Adds a content definition object under this dialog definition.
  		 *
  		 * @param {CKEDITOR.dialog.definition.content} contentDefinition The
  		 * content definition.
  		 * @param {String} [nextSiblingId] The id of an existing content
  		 * definition which the new content definition will be inserted
  		 * before. Omit if the new content definition is to be inserted as
  		 * the last item.
  		 * @returns {CKEDITOR.dialog.definition.content} The inserted content definition.
  		 */
  		addContents: function( contentDefinition, nextSiblingId ) {
  			return addById( this.contents, contentDefinition, nextSiblingId );
  		},
  
  		/**
  		 * Adds a button definition object under this dialog definition.
  		 *
  		 * @param {CKEDITOR.dialog.definition.button} buttonDefinition The
  		 * button definition.
  		 * @param {String} [nextSiblingId] The id of an existing button
  		 * definition which the new button definition will be inserted
  		 * before. Omit if the new button definition is to be inserted as
  		 * the last item.
  		 * @returns {CKEDITOR.dialog.definition.button} The inserted button definition.
  		 */
  		addButton: function( buttonDefinition, nextSiblingId ) {
  			return addById( this.buttons, buttonDefinition, nextSiblingId );
  		},
  
  		/**
  		 * Removes a content definition from this dialog definition.
  		 *
  		 * @param {String} id The id of the content definition to be removed.
  		 * @returns {CKEDITOR.dialog.definition.content} The removed content definition.
  		 */
  		removeContents: function( id ) {
  			removeById( this.contents, id );
  		},
  
  		/**
  		 * Removes a button definition from the dialog definition.
  		 *
  		 * @param {String} id The id of the button definition to be removed.
  		 * @returns {CKEDITOR.dialog.definition.button} The removed button definition.
  		 */
  		removeButton: function( id ) {
  			removeById( this.buttons, id );
  		}
  	};
  
  	/**
  	 * This class is not really part of the API. It is the template of the
  	 * objects representing content pages inside the
  	 * CKEDITOR.dialog.definitionObject.
  	 *
  	 *		CKEDITOR.on( 'dialogDefinition', function( evt ) {
  	 *			var definition = evt.data.definition;
  	 *			var content = definition.getContents( 'page1' );
  	 *			content.remove( 'textInput1' );
  	 *			// ...
  	 *		} );
  	 *
  	 * @private
  	 * @class CKEDITOR.dialog.definition.contentObject
  	 * @constructor Creates a contentObject class instance.
  	 */
  	function contentObject( dialog, contentDefinition ) {
  		this._ = {
  			dialog: dialog
  		};
  
  		CKEDITOR.tools.extend( this, contentDefinition );
  	}
  
  	contentObject.prototype = {
  		/**
  		 * Gets a UI element definition under the content definition.
  		 *
  		 * @param {String} id The id of the UI element definition.
  		 * @returns {CKEDITOR.dialog.definition.uiElement}
  		 */
  		get: function( id ) {
  			return getById( this.elements, id, 'children' );
  		},
  
  		/**
  		 * Adds a UI element definition to the content definition.
  		 *
  		 * @param {CKEDITOR.dialog.definition.uiElement} elementDefinition The
  		 * UI elemnet definition to be added.
  		 * @param {String} nextSiblingId The id of an existing UI element
  		 * definition which the new UI element definition will be inserted
  		 * before. Omit if the new button definition is to be inserted as
  		 * the last item.
  		 * @returns {CKEDITOR.dialog.definition.uiElement} The element definition inserted.
  		 */
  		add: function( elementDefinition, nextSiblingId ) {
  			return addById( this.elements, elementDefinition, nextSiblingId, 'children' );
  		},
  
  		/**
  		 * Removes a UI element definition from the content definition.
  		 *
  		 * @param {String} id The id of the UI element definition to be removed.
  		 * @returns {CKEDITOR.dialog.definition.uiElement} The element definition removed.
  		 */
  		remove: function( id ) {
  			removeById( this.elements, id, 'children' );
  		}
  	};
  
  	function initDragAndDrop( dialog ) {
  		var lastCoords = null,
  			abstractDialogCoords = null,
  			editor = dialog.getParentEditor(),
  			magnetDistance = editor.config.dialog_magnetDistance,
  			margins = CKEDITOR.skin.margins || [ 0, 0, 0, 0 ];
  
  		if ( typeof magnetDistance == 'undefined' )
  			magnetDistance = 20;
  
  		function mouseMoveHandler( evt ) {
  			var dialogSize = dialog.getSize(),
  				viewPaneSize = CKEDITOR.document.getWindow().getViewPaneSize(),
  				x = evt.data.$.screenX,
  				y = evt.data.$.screenY,
  				dx = x - lastCoords.x,
  				dy = y - lastCoords.y,
  				realX, realY;
  
  			lastCoords = { x: x, y: y };
  			abstractDialogCoords.x += dx;
  			abstractDialogCoords.y += dy;
  
  			if ( abstractDialogCoords.x + margins[ 3 ] < magnetDistance )
  				realX = -margins[ 3 ];
  			else if ( abstractDialogCoords.x - margins[ 1 ] > viewPaneSize.width - dialogSize.width - magnetDistance )
  				realX = viewPaneSize.width - dialogSize.width + ( editor.lang.dir == 'rtl' ? 0 : margins[ 1 ] );
  			else
  				realX = abstractDialogCoords.x;
  
  			if ( abstractDialogCoords.y + margins[ 0 ] < magnetDistance )
  				realY = -margins[ 0 ];
  			else if ( abstractDialogCoords.y - margins[ 2 ] > viewPaneSize.height - dialogSize.height - magnetDistance )
  				realY = viewPaneSize.height - dialogSize.height + margins[ 2 ];
  			else
  				realY = abstractDialogCoords.y;
  
  			dialog.move( realX, realY, 1 );
  
  			evt.data.preventDefault();
  		}
  
  		function mouseUpHandler() {
  			CKEDITOR.document.removeListener( 'mousemove', mouseMoveHandler );
  			CKEDITOR.document.removeListener( 'mouseup', mouseUpHandler );
  
  			if ( CKEDITOR.env.ie6Compat ) {
  				var coverDoc = currentCover.getChild( 0 ).getFrameDocument();
  				coverDoc.removeListener( 'mousemove', mouseMoveHandler );
  				coverDoc.removeListener( 'mouseup', mouseUpHandler );
  			}
  		}
  
  		dialog.parts.title.on( 'mousedown', function( evt ) {
  			lastCoords = { x: evt.data.$.screenX, y: evt.data.$.screenY };
  
  			CKEDITOR.document.on( 'mousemove', mouseMoveHandler );
  			CKEDITOR.document.on( 'mouseup', mouseUpHandler );
  			abstractDialogCoords = dialog.getPosition();
  
  			if ( CKEDITOR.env.ie6Compat ) {
  				var coverDoc = currentCover.getChild( 0 ).getFrameDocument();
  				coverDoc.on( 'mousemove', mouseMoveHandler );
  				coverDoc.on( 'mouseup', mouseUpHandler );
  			}
  
  			evt.data.preventDefault();
  		}, dialog );
  	}
  
  	function initResizeHandles( dialog ) {
  		var def = dialog.definition,
  			resizable = def.resizable;
  
  		if ( resizable == CKEDITOR.DIALOG_RESIZE_NONE )
  			return;
  
  		var editor = dialog.getParentEditor();
  		var wrapperWidth, wrapperHeight, viewSize, origin, startSize, dialogCover;
  
  		var mouseDownFn = CKEDITOR.tools.addFunction( function( $event ) {
  			startSize = dialog.getSize();
  
  			var content = dialog.parts.contents,
  				iframeDialog = content.$.getElementsByTagName( 'iframe' ).length;
  
  			// Shim to help capturing "mousemove" over iframe.
  			if ( iframeDialog ) {
  				dialogCover = CKEDITOR.dom.element.createFromHtml( '<div class="cke_dialog_resize_cover" style="height: 100%; position: absolute; width: 100%;"></div>' );
  				content.append( dialogCover );
  			}
  
  			// Calculate the offset between content and chrome size.
  			wrapperHeight = startSize.height - dialog.parts.contents.getSize( 'height', !( CKEDITOR.env.gecko || CKEDITOR.env.ie && CKEDITOR.env.quirks ) );
  			wrapperWidth = startSize.width - dialog.parts.contents.getSize( 'width', 1 );
  
  			origin = { x: $event.screenX, y: $event.screenY };
  
  			viewSize = CKEDITOR.document.getWindow().getViewPaneSize();
  
  			CKEDITOR.document.on( 'mousemove', mouseMoveHandler );
  			CKEDITOR.document.on( 'mouseup', mouseUpHandler );
  
  			if ( CKEDITOR.env.ie6Compat ) {
  				var coverDoc = currentCover.getChild( 0 ).getFrameDocument();
  				coverDoc.on( 'mousemove', mouseMoveHandler );
  				coverDoc.on( 'mouseup', mouseUpHandler );
  			}
  
  			$event.preventDefault && $event.preventDefault();
  		} );
  
  		// Prepend the grip to the dialog.
  		dialog.on( 'load', function() {
  			var direction = '';
  			if ( resizable == CKEDITOR.DIALOG_RESIZE_WIDTH )
  				direction = ' cke_resizer_horizontal';
  			else if ( resizable == CKEDITOR.DIALOG_RESIZE_HEIGHT )
  				direction = ' cke_resizer_vertical';
  			var resizer = CKEDITOR.dom.element.createFromHtml(
  				'<div' +
  				' class="cke_resizer' + direction + ' cke_resizer_' + editor.lang.dir + '"' +
  				' title="' + CKEDITOR.tools.htmlEncode( editor.lang.common.resize ) + '"' +
  				' onmousedown="CKEDITOR.tools.callFunction(' + mouseDownFn + ', event )">' +
  				// BLACK LOWER RIGHT TRIANGLE (ltr)
  				// BLACK LOWER LEFT TRIANGLE (rtl)
  				( editor.lang.dir == 'ltr' ? '\u25E2' : '\u25E3' ) +
  				'</div>' );
  			dialog.parts.footer.append( resizer, 1 );
  		} );
  		editor.on( 'destroy', function() {
  			CKEDITOR.tools.removeFunction( mouseDownFn );
  		} );
  
  		function mouseMoveHandler( evt ) {
  			var rtl = editor.lang.dir == 'rtl',
  				dx = ( evt.data.$.screenX - origin.x ) * ( rtl ? -1 : 1 ),
  				dy = evt.data.$.screenY - origin.y,
  				width = startSize.width,
  				height = startSize.height,
  				internalWidth = width + dx * ( dialog._.moved ? 1 : 2 ),
  				internalHeight = height + dy * ( dialog._.moved ? 1 : 2 ),
  				element = dialog._.element.getFirst(),
  				right = rtl && element.getComputedStyle( 'right' ),
  				position = dialog.getPosition();
  
  			if ( position.y + internalHeight > viewSize.height )
  				internalHeight = viewSize.height - position.y;
  
  			if ( ( rtl ? right : position.x ) + internalWidth > viewSize.width )
  				internalWidth = viewSize.width - ( rtl ? right : position.x );
  
  			// Make sure the dialog will not be resized to the wrong side when it's in the leftmost position for RTL.
  			if ( ( resizable == CKEDITOR.DIALOG_RESIZE_WIDTH || resizable == CKEDITOR.DIALOG_RESIZE_BOTH ) )
  				width = Math.max( def.minWidth || 0, internalWidth - wrapperWidth );
  
  			if ( resizable == CKEDITOR.DIALOG_RESIZE_HEIGHT || resizable == CKEDITOR.DIALOG_RESIZE_BOTH )
  				height = Math.max( def.minHeight || 0, internalHeight - wrapperHeight );
  
  			dialog.resize( width, height );
  
  			if ( !dialog._.moved )
  				dialog.layout();
  
  			evt.data.preventDefault();
  		}
  
  		function mouseUpHandler() {
  			CKEDITOR.document.removeListener( 'mouseup', mouseUpHandler );
  			CKEDITOR.document.removeListener( 'mousemove', mouseMoveHandler );
  
  			if ( dialogCover ) {
  				dialogCover.remove();
  				dialogCover = null;
  			}
  
  			if ( CKEDITOR.env.ie6Compat ) {
  				var coverDoc = currentCover.getChild( 0 ).getFrameDocument();
  				coverDoc.removeListener( 'mouseup', mouseUpHandler );
  				coverDoc.removeListener( 'mousemove', mouseMoveHandler );
  			}
  		}
  	}
  
  	var resizeCover;
  	// Caching resuable covers and allowing only one cover
  	// on screen.
  	var covers = {},
  		currentCover;
  
  	function cancelEvent( ev ) {
  		ev.data.preventDefault( 1 );
  	}
  
  	function showCover( editor ) {
  		var win = CKEDITOR.document.getWindow();
  		var config = editor.config,
  			backgroundColorStyle = config.dialog_backgroundCoverColor || 'white',
  			backgroundCoverOpacity = config.dialog_backgroundCoverOpacity,
  			baseFloatZIndex = config.baseFloatZIndex,
  			coverKey = CKEDITOR.tools.genKey( backgroundColorStyle, backgroundCoverOpacity, baseFloatZIndex ),
  			coverElement = covers[ coverKey ];
  
  		if ( !coverElement ) {
  			var html = [
  				'<div tabIndex="-1" style="position: ', ( CKEDITOR.env.ie6Compat ? 'absolute' : 'fixed' ),
  				'; z-index: ', baseFloatZIndex,
  				'; top: 0px; left: 0px; ',
  				( !CKEDITOR.env.ie6Compat ? 'background-color: ' + backgroundColorStyle : '' ),
  				'" class="cke_dialog_background_cover">'
  			];
  
  			if ( CKEDITOR.env.ie6Compat ) {
  				// Support for custom document.domain in IE.
  				var iframeHtml = '<html><body style=\\\'background-color:' + backgroundColorStyle + ';\\\'></body></html>';
  
  				html.push( '<iframe' +
  					' hidefocus="true"' +
  					' frameborder="0"' +
  					' id="cke_dialog_background_iframe"' +
  					' src="javascript:' );
  
  				html.push( 'void((function(){' + encodeURIComponent(
  					'document.open();' +
  					// Support for custom document.domain in IE.
  					'(' + CKEDITOR.tools.fixDomain + ')();' +
  					'document.write( \'' + iframeHtml + '\' );' +
  					'document.close();'
  				) + '})())' );
  
  				html.push( '"' +
  					' style="' +
  						'position:absolute;' +
  						'left:0;' +
  						'top:0;' +
  						'width:100%;' +
  						'height: 100%;' +
  						'filter: progid:DXImageTransform.Microsoft.Alpha(opacity=0)">' +
  					'</iframe>' );
  			}
  
  			html.push( '</div>' );
  
  			coverElement = CKEDITOR.dom.element.createFromHtml( html.join( '' ) );
  			coverElement.setOpacity( backgroundCoverOpacity !== undefined ? backgroundCoverOpacity : 0.5 );
  
  			coverElement.on( 'keydown', cancelEvent );
  			coverElement.on( 'keypress', cancelEvent );
  			coverElement.on( 'keyup', cancelEvent );
  
  			coverElement.appendTo( CKEDITOR.document.getBody() );
  			covers[ coverKey ] = coverElement;
  		} else {
  			coverElement.show();
  		}
  
  		// Makes the dialog cover a focus holder as well.
  		editor.focusManager.add( coverElement );
  
  		currentCover = coverElement;
  		var resizeFunc = function() {
  				var size = win.getViewPaneSize();
  				coverElement.setStyles( {
  					width: size.width + 'px',
  					height: size.height + 'px'
  				} );
  			};
  
  		var scrollFunc = function() {
  				var pos = win.getScrollPosition(),
  					cursor = CKEDITOR.dialog._.currentTop;
  				coverElement.setStyles( {
  					left: pos.x + 'px',
  					top: pos.y + 'px'
  				} );
  
  				if ( cursor ) {
  					do {
  						var dialogPos = cursor.getPosition();
  						cursor.move( dialogPos.x, dialogPos.y );
  					} while ( ( cursor = cursor._.parentDialog ) );
  				}
  			};
  
  		resizeCover = resizeFunc;
  		win.on( 'resize', resizeFunc );
  		resizeFunc();
  		// Using Safari/Mac, focus must be kept where it is (#7027)
  		if ( !( CKEDITOR.env.mac && CKEDITOR.env.webkit ) )
  			coverElement.focus();
  
  		if ( CKEDITOR.env.ie6Compat ) {
  			// IE BUG: win.$.onscroll assignment doesn't work.. it must be window.onscroll.
  			// So we need to invent a really funny way to make it work.
  			var myScrollHandler = function() {
  					scrollFunc();
  					arguments.callee.prevScrollHandler.apply( this, arguments );
  				};
  			win.$.setTimeout( function() {
  				myScrollHandler.prevScrollHandler = window.onscroll ||
  				function() {};
  				window.onscroll = myScrollHandler;
  			}, 0 );
  			scrollFunc();
  		}
  	}
  
  	function hideCover( editor ) {
  		if ( !currentCover )
  			return;
  
  		editor.focusManager.remove( currentCover );
  		var win = CKEDITOR.document.getWindow();
  		currentCover.hide();
  		win.removeListener( 'resize', resizeCover );
  
  		if ( CKEDITOR.env.ie6Compat ) {
  			win.$.setTimeout( function() {
  				var prevScrollHandler = window.onscroll && window.onscroll.prevScrollHandler;
  				window.onscroll = prevScrollHandler || null;
  			}, 0 );
  		}
  		resizeCover = null;
  	}
  
  	function removeCovers() {
  		for ( var coverId in covers )
  			covers[ coverId ].remove();
  		covers = {};
  	}
  
  	var accessKeyProcessors = {};
  
  	var accessKeyDownHandler = function( evt ) {
  			var ctrl = evt.data.$.ctrlKey || evt.data.$.metaKey,
  				alt = evt.data.$.altKey,
  				shift = evt.data.$.shiftKey,
  				key = String.fromCharCode( evt.data.$.keyCode ),
  				keyProcessor = accessKeyProcessors[ ( ctrl ? 'CTRL+' : '' ) + ( alt ? 'ALT+' : '' ) + ( shift ? 'SHIFT+' : '' ) + key ];
  
  			if ( !keyProcessor || !keyProcessor.length )
  				return;
  
  			keyProcessor = keyProcessor[ keyProcessor.length - 1 ];
  			keyProcessor.keydown && keyProcessor.keydown.call( keyProcessor.uiElement, keyProcessor.dialog, keyProcessor.key );
  			evt.data.preventDefault();
  		};
  
  	var accessKeyUpHandler = function( evt ) {
  			var ctrl = evt.data.$.ctrlKey || evt.data.$.metaKey,
  				alt = evt.data.$.altKey,
  				shift = evt.data.$.shiftKey,
  				key = String.fromCharCode( evt.data.$.keyCode ),
  				keyProcessor = accessKeyProcessors[ ( ctrl ? 'CTRL+' : '' ) + ( alt ? 'ALT+' : '' ) + ( shift ? 'SHIFT+' : '' ) + key ];
  
  			if ( !keyProcessor || !keyProcessor.length )
  				return;
  
  			keyProcessor = keyProcessor[ keyProcessor.length - 1 ];
  			if ( keyProcessor.keyup ) {
  				keyProcessor.keyup.call( keyProcessor.uiElement, keyProcessor.dialog, keyProcessor.key );
  				evt.data.preventDefault();
  			}
  		};
  
  	var registerAccessKey = function( uiElement, dialog, key, downFunc, upFunc ) {
  			var procList = accessKeyProcessors[ key ] || ( accessKeyProcessors[ key ] = [] );
  			procList.push( {
  				uiElement: uiElement,
  				dialog: dialog,
  				key: key,
  				keyup: upFunc || uiElement.accessKeyUp,
  				keydown: downFunc || uiElement.accessKeyDown
  			} );
  		};
  
  	var unregisterAccessKey = function( obj ) {
  			for ( var i in accessKeyProcessors ) {
  				var list = accessKeyProcessors[ i ];
  				for ( var j = list.length - 1; j >= 0; j-- ) {
  					if ( list[ j ].dialog == obj || list[ j ].uiElement == obj )
  						list.splice( j, 1 );
  				}
  				if ( list.length === 0 )
  					delete accessKeyProcessors[ i ];
  			}
  		};
  
  	var tabAccessKeyUp = function( dialog, key ) {
  			if ( dialog._.accessKeyMap[ key ] )
  				dialog.selectPage( dialog._.accessKeyMap[ key ] );
  		};
  
  	var tabAccessKeyDown = function() {};
  
  	( function() {
  		CKEDITOR.ui.dialog = {
  			/**
  			 * The base class of all dialog UI elements.
  			 *
  			 * @class CKEDITOR.ui.dialog.uiElement
  			 * @constructor Creates a uiElement class instance.
  			 * @param {CKEDITOR.dialog} dialog Parent dialog object.
  			 * @param {CKEDITOR.dialog.definition.uiElement} elementDefinition Element
  			 * definition.
  			 *
  			 * Accepted fields:
  			 *
  			 * * `id` (Required) The id of the UI element. See {@link CKEDITOR.dialog#getContentElement}.
  			 * * `type` (Required) The type of the UI element. The
  			 *     value to this field specifies which UI element class will be used to
  			 *     generate the final widget.
  			 * * `title` (Optional) The popup tooltip for the UI
  			 *     element.
  			 * * `hidden` (Optional) A flag that tells if the element
  			 *     should be initially visible.
  			 * * `className` (Optional) Additional CSS class names
  			 *     to add to the UI element. Separated by space.
  			 * * `style` (Optional) Additional CSS inline styles
  			 *     to add to the UI element. A semicolon (;) is required after the last
  			 *     style declaration.
  			 * * `accessKey` (Optional) The alphanumeric access key
  			 *     for this element. Access keys are automatically prefixed by CTRL.
  			 * * `on*` (Optional) Any UI element definition field that
  			 *     starts with `on` followed immediately by a capital letter and
  			 *     probably more letters is an event handler. Event handlers may be further
  			 *     divided into registered event handlers and DOM event handlers. Please
  			 *     refer to {@link CKEDITOR.ui.dialog.uiElement#registerEvents} and
  			 *     {@link CKEDITOR.ui.dialog.uiElement#eventProcessors} for more information.
  			 *
  			 * @param {Array} htmlList
  			 * List of HTML code to be added to the dialog's content area.
  			 * @param {Function/String} [nodeNameArg='div']
  			 * A function returning a string, or a simple string for the node name for
  			 * the root DOM node.
  			 * @param {Function/Object} [stylesArg={}]
  			 * A function returning an object, or a simple object for CSS styles applied
  			 * to the DOM node.
  			 * @param {Function/Object} [attributesArg={}]
  			 * A fucntion returning an object, or a simple object for attributes applied
  			 * to the DOM node.
  			 * @param {Function/String} [contentsArg='']
  			 * A function returning a string, or a simple string for the HTML code inside
  			 * the root DOM node. Default is empty string.
  			 */
  			uiElement: function( dialog, elementDefinition, htmlList, nodeNameArg, stylesArg, attributesArg, contentsArg ) {
  				if ( arguments.length < 4 )
  					return;
  
  				var nodeName = ( nodeNameArg.call ? nodeNameArg( elementDefinition ) : nodeNameArg ) || 'div',
  					html = [ '<', nodeName, ' ' ],
  					styles = ( stylesArg && stylesArg.call ? stylesArg( elementDefinition ) : stylesArg ) || {},
  					attributes = ( attributesArg && attributesArg.call ? attributesArg( elementDefinition ) : attributesArg ) || {},
  					innerHTML = ( contentsArg && contentsArg.call ? contentsArg.call( this, dialog, elementDefinition ) : contentsArg ) || '',
  					domId = this.domId = attributes.id || CKEDITOR.tools.getNextId() + '_uiElement',
  					i;
  
  				if ( elementDefinition.requiredContent && !dialog.getParentEditor().filter.check( elementDefinition.requiredContent ) ) {
  					styles.display = 'none';
  					this.notAllowed = true;
  				}
  
  				// Set the id, a unique id is required for getElement() to work.
  				attributes.id = domId;
  
  				// Set the type and definition CSS class names.
  				var classes = {};
  				if ( elementDefinition.type )
  					classes[ 'cke_dialog_ui_' + elementDefinition.type ] = 1;
  				if ( elementDefinition.className )
  					classes[ elementDefinition.className ] = 1;
  				if ( elementDefinition.disabled )
  					classes.cke_disabled = 1;
  
  				var attributeClasses = ( attributes[ 'class' ] && attributes[ 'class' ].split ) ? attributes[ 'class' ].split( ' ' ) : [];
  				for ( i = 0; i < attributeClasses.length; i++ ) {
  					if ( attributeClasses[ i ] )
  						classes[ attributeClasses[ i ] ] = 1;
  				}
  				var finalClasses = [];
  				for ( i in classes )
  					finalClasses.push( i );
  				attributes[ 'class' ] = finalClasses.join( ' ' );
  
  				// Set the popup tooltop.
  				if ( elementDefinition.title )
  					attributes.title = elementDefinition.title;
  
  				// Write the inline CSS styles.
  				var styleStr = ( elementDefinition.style || '' ).split( ';' );
  
  				// Element alignment support.
  				if ( elementDefinition.align ) {
  					var align = elementDefinition.align;
  					styles[ 'margin-left' ] = align == 'left' ? 0 : 'auto';
  					styles[ 'margin-right' ] = align == 'right' ? 0 : 'auto';
  				}
  
  				for ( i in styles )
  					styleStr.push( i + ':' + styles[ i ] );
  				if ( elementDefinition.hidden )
  					styleStr.push( 'display:none' );
  				for ( i = styleStr.length - 1; i >= 0; i-- ) {
  					if ( styleStr[ i ] === '' )
  						styleStr.splice( i, 1 );
  				}
  				if ( styleStr.length > 0 )
  					attributes.style = ( attributes.style ? ( attributes.style + '; ' ) : '' ) + styleStr.join( '; ' );
  
  				// Write the attributes.
  				for ( i in attributes )
  					html.push( i + '="' + CKEDITOR.tools.htmlEncode( attributes[ i ] ) + '" ' );
  
  				// Write the content HTML.
  				html.push( '>', innerHTML, '</', nodeName, '>' );
  
  				// Add contents to the parent HTML array.
  				htmlList.push( html.join( '' ) );
  
  				( this._ || ( this._ = {} ) ).dialog = dialog;
  
  				// Override isChanged if it is defined in element definition.
  				if ( typeof elementDefinition.isChanged == 'boolean' )
  					this.isChanged = function() {
  						return elementDefinition.isChanged;
  					};
  				if ( typeof elementDefinition.isChanged == 'function' )
  					this.isChanged = elementDefinition.isChanged;
  
  				// Overload 'get(set)Value' on definition.
  				if ( typeof elementDefinition.setValue == 'function' ) {
  					this.setValue = CKEDITOR.tools.override( this.setValue, function( org ) {
  						return function( val ) {
  							org.call( this, elementDefinition.setValue.call( this, val ) );
  						};
  					} );
  				}
  
  				if ( typeof elementDefinition.getValue == 'function' ) {
  					this.getValue = CKEDITOR.tools.override( this.getValue, function( org ) {
  						return function() {
  							return elementDefinition.getValue.call( this, org.call( this ) );
  						};
  					} );
  				}
  
  				// Add events.
  				CKEDITOR.event.implementOn( this );
  
  				this.registerEvents( elementDefinition );
  				if ( this.accessKeyUp && this.accessKeyDown && elementDefinition.accessKey )
  					registerAccessKey( this, dialog, 'CTRL+' + elementDefinition.accessKey );
  
  				var me = this;
  				dialog.on( 'load', function() {
  					var input = me.getInputElement();
  					if ( input ) {
  						var focusClass = me.type in { 'checkbox': 1, 'ratio': 1 } && CKEDITOR.env.ie && CKEDITOR.env.version < 8 ? 'cke_dialog_ui_focused' : '';
  						input.on( 'focus', function() {
  							dialog._.tabBarMode = false;
  							dialog._.hasFocus = true;
  							me.fire( 'focus' );
  							focusClass && this.addClass( focusClass );
  
  						} );
  
  						input.on( 'blur', function() {
  							me.fire( 'blur' );
  							focusClass && this.removeClass( focusClass );
  						} );
  					}
  				} );
  
  				// Completes this object with everything we have in the
  				// definition.
  				CKEDITOR.tools.extend( this, elementDefinition );
  
  				// Register the object as a tab focus if it can be included.
  				if ( this.keyboardFocusable ) {
  					this.tabIndex = elementDefinition.tabIndex || 0;
  
  					this.focusIndex = dialog._.focusList.push( this ) - 1;
  					this.on( 'focus', function() {
  						dialog._.currentFocusIndex = me.focusIndex;
  					} );
  				}
  			},
  
  			/**
  			 * Horizontal layout box for dialog UI elements, auto-expends to available width of container.
  			 *
  			 * @class CKEDITOR.ui.dialog.hbox
  			 * @extends CKEDITOR.ui.dialog.uiElement
  			 * @constructor Creates a hbox class instance.
  			 * @param {CKEDITOR.dialog} dialog Parent dialog object.
  			 * @param {Array} childObjList
  			 * Array of {@link CKEDITOR.ui.dialog.uiElement} objects inside this container.
  			 * @param {Array} childHtmlList
  			 * Array of HTML code that correspond to the HTML output of all the
  			 * objects in childObjList.
  			 * @param {Array} htmlList
  			 * Array of HTML code that this element will output to.
  			 * @param {CKEDITOR.dialog.definition.uiElement} elementDefinition
  			 * The element definition. Accepted fields:
  			 *
  			 * * `widths` (Optional) The widths of child cells.
  			 * * `height` (Optional) The height of the layout.
  			 * * `padding` (Optional) The padding width inside child cells.
  			 * * `align` (Optional) The alignment of the whole layout.
  			 */
  			hbox: function( dialog, childObjList, childHtmlList, htmlList, elementDefinition ) {
  				if ( arguments.length < 4 )
  					return;
  
  				this._ || ( this._ = {} );
  
  				var children = this._.children = childObjList,
  					widths = elementDefinition && elementDefinition.widths || null,
  					height = elementDefinition && elementDefinition.height || null,
  					styles = {},
  					i;
  				/** @ignore */
  				var innerHTML = function() {
  						var html = [ '<tbody><tr class="cke_dialog_ui_hbox">' ];
  						for ( i = 0; i < childHtmlList.length; i++ ) {
  							var className = 'cke_dialog_ui_hbox_child',
  								styles = [];
  							if ( i === 0 ) {
  								className = 'cke_dialog_ui_hbox_first';
  							}
  							if ( i == childHtmlList.length - 1 ) {
  								className = 'cke_dialog_ui_hbox_last';
  							}
  
  							html.push( '<td class="', className, '" role="presentation" ' );
  							if ( widths ) {
  								if ( widths[ i ] ) {
  									styles.push( 'width:' + cssLength( widths[i] ) );
  								}
  							} else {
  								styles.push( 'width:' + Math.floor( 100 / childHtmlList.length ) + '%' );
  							}
  							if ( height ) {
  								styles.push( 'height:' + cssLength( height ) );
  							}
  							if ( elementDefinition && elementDefinition.padding !== undefined ) {
  								styles.push( 'padding:' + cssLength( elementDefinition.padding ) );
  							}
  							// In IE Quirks alignment has to be done on table cells. (#7324)
  							if ( CKEDITOR.env.ie && CKEDITOR.env.quirks && children[ i ].align ) {
  								styles.push( 'text-align:' + children[ i ].align );
  							}
  							if ( styles.length > 0 ) {
  								html.push( 'style="' + styles.join( '; ' ) + '" ' );
  							}
  							html.push( '>', childHtmlList[ i ], '</td>' );
  						}
  						html.push( '</tr></tbody>' );
  						return html.join( '' );
  					};
  
  				var attribs = { role: 'presentation' };
  				elementDefinition && elementDefinition.align && ( attribs.align = elementDefinition.align );
  
  				CKEDITOR.ui.dialog.uiElement.call( this, dialog, elementDefinition || { type: 'hbox' }, htmlList, 'table', styles, attribs, innerHTML );
  			},
  
  			/**
  			 * Vertical layout box for dialog UI elements.
  			 *
  			 * @class CKEDITOR.ui.dialog.vbox
  			 * @extends CKEDITOR.ui.dialog.hbox
  			 * @constructor Creates a vbox class instance.
  			 * @param {CKEDITOR.dialog} dialog Parent dialog object.
  			 * @param {Array} childObjList
  			 * Array of {@link CKEDITOR.ui.dialog.uiElement} objects inside this container.
  			 * @param {Array} childHtmlList
  			 * Array of HTML code that correspond to the HTML output of all the
  			 * objects in childObjList.
  			 * @param {Array} htmlList Array of HTML code that this element will output to.
  			 * @param {CKEDITOR.dialog.definition.uiElement} elementDefinition
  			 * The element definition. Accepted fields:
  			 *
  			 * * `width` (Optional) The width of the layout.
  			 * * `heights` (Optional) The heights of individual cells.
  			 * * `align` (Optional) The alignment of the layout.
  			 * * `padding` (Optional) The padding width inside child cells.
  			 * * `expand` (Optional) Whether the layout should expand
  			 *     vertically to fill its container.
  			 */
  			vbox: function( dialog, childObjList, childHtmlList, htmlList, elementDefinition ) {
  				if ( arguments.length < 3 )
  					return;
  
  				this._ || ( this._ = {} );
  
  				var children = this._.children = childObjList,
  					width = elementDefinition && elementDefinition.width || null,
  					heights = elementDefinition && elementDefinition.heights || null;
  				/** @ignore */
  				var innerHTML = function() {
  						var html = [ '<table role="presentation" cellspacing="0" border="0" ' ];
  						html.push( 'style="' );
  						if ( elementDefinition && elementDefinition.expand )
  							html.push( 'height:100%;' );
  						html.push( 'width:' + cssLength( width || '100%' ), ';' );
  
  						// (#10123) Temp fix for dialog broken layout in latest webkit.
  						if ( CKEDITOR.env.webkit )
  							html.push( 'float:none;' );
  
  						html.push( '"' );
  						html.push( 'align="', CKEDITOR.tools.htmlEncode(
  						( elementDefinition && elementDefinition.align ) || ( dialog.getParentEditor().lang.dir == 'ltr' ? 'left' : 'right' ) ), '" ' );
  
  						html.push( '><tbody>' );
  						for ( var i = 0; i < childHtmlList.length; i++ ) {
  							var styles = [];
  							html.push( '<tr><td role="presentation" ' );
  							if ( width )
  								styles.push( 'width:' + cssLength( width || '100%' ) );
  							if ( heights )
  								styles.push( 'height:' + cssLength( heights[ i ] ) );
  							else if ( elementDefinition && elementDefinition.expand )
  								styles.push( 'height:' + Math.floor( 100 / childHtmlList.length ) + '%' );
  							if ( elementDefinition && elementDefinition.padding !== undefined )
  								styles.push( 'padding:' + cssLength( elementDefinition.padding ) );
  							// In IE Quirks alignment has to be done on table cells. (#7324)
  							if ( CKEDITOR.env.ie && CKEDITOR.env.quirks && children[ i ].align )
  								styles.push( 'text-align:' + children[ i ].align );
  							if ( styles.length > 0 )
  								html.push( 'style="', styles.join( '; ' ), '" ' );
  							html.push( ' class="cke_dialog_ui_vbox_child">', childHtmlList[ i ], '</td></tr>' );
  						}
  						html.push( '</tbody></table>' );
  						return html.join( '' );
  					};
  				CKEDITOR.ui.dialog.uiElement.call( this, dialog, elementDefinition || { type: 'vbox' }, htmlList, 'div', null, { role: 'presentation' }, innerHTML );
  			}
  		};
  	} )();
  
  	/** @class CKEDITOR.ui.dialog.uiElement */
  	CKEDITOR.ui.dialog.uiElement.prototype = {
  		/**
  		 * Gets the root DOM element of this dialog UI object.
  		 *
  		 *		uiElement.getElement().hide();
  		 *
  		 * @returns {CKEDITOR.dom.element} Root DOM element of UI object.
  		 */
  		getElement: function() {
  			return CKEDITOR.document.getById( this.domId );
  		},
  
  		/**
  		 * Gets the DOM element that the user inputs values.
  		 *
  		 * This function is used by {@link #setValue}, {@link #getValue} and {@link #focus}. It should
  		 * be overrided in child classes where the input element isn't the root
  		 * element.
  		 *
  		 *		var rawValue = textInput.getInputElement().$.value;
  		 *
  		 * @returns {CKEDITOR.dom.element} The element where the user input values.
  		 */
  		getInputElement: function() {
  			return this.getElement();
  		},
  
  		/**
  		 * Gets the parent dialog object containing this UI element.
  		 *
  		 *		var dialog = uiElement.getDialog();
  		 *
  		 * @returns {CKEDITOR.dialog} Parent dialog object.
  		 */
  		getDialog: function() {
  			return this._.dialog;
  		},
  
  		/**
  		 * Sets the value of this dialog UI object.
  		 *
  		 *		uiElement.setValue( 'Dingo' );
  		 *
  		 * @chainable
  		 * @param {Object} value The new value.
  		 * @param {Boolean} noChangeEvent Internal commit, to supress `change` event on this element.
  		 */
  		setValue: function( value, noChangeEvent ) {
  			this.getInputElement().setValue( value );
  			!noChangeEvent && this.fire( 'change', { value: value } );
  			return this;
  		},
  
  		/**
  		 * Gets the current value of this dialog UI object.
  		 *
  		 *		var myValue = uiElement.getValue();
  		 *
  		 * @returns {Object} The current value.
  		 */
  		getValue: function() {
  			return this.getInputElement().getValue();
  		},
  
  		/**
  		 * Tells whether the UI object's value has changed.
  		 *
  		 *		if ( uiElement.isChanged() )
  		 *			confirm( 'Value changed! Continue?' );
  		 *
  		 * @returns {Boolean} `true` if changed, `false` if not changed.
  		 */
  		isChanged: function() {
  			// Override in input classes.
  			return false;
  		},
  
  		/**
  		 * Selects the parent tab of this element. Usually called by focus() or overridden focus() methods.
  		 *
  		 *		focus : function() {
  		 *			this.selectParentTab();
  		 *			// do something else.
  		 *		}
  		 *
  		 * @chainable
  		 */
  		selectParentTab: function() {
  			var element = this.getInputElement(),
  				cursor = element,
  				tabId;
  			while ( ( cursor = cursor.getParent() ) && cursor.$.className.search( 'cke_dialog_page_contents' ) == -1 ) {
  
  			}
  
  			// Some widgets don't have parent tabs (e.g. OK and Cancel buttons).
  			if ( !cursor )
  				return this;
  
  			tabId = cursor.getAttribute( 'name' );
  			// Avoid duplicate select.
  			if ( this._.dialog._.currentTabId != tabId )
  				this._.dialog.selectPage( tabId );
  			return this;
  		},
  
  		/**
  		 * Puts the focus to the UI object. Switches tabs if the UI object isn't in the active tab page.
  		 *
  		 *		uiElement.focus();
  		 *
  		 * @chainable
  		 */
  		focus: function() {
  			this.selectParentTab().getInputElement().focus();
  			return this;
  		},
  
  		/**
  		 * Registers the `on*` event handlers defined in the element definition.
  		 *
  		 * The default behavior of this function is:
  		 *
  		 * 1. If the on* event is defined in the class's eventProcesors list,
  		 *     then the registration is delegated to the corresponding function
  		 *     in the eventProcessors list.
  		 * 2. If the on* event is not defined in the eventProcessors list, then
  		 *     register the event handler under the corresponding DOM event of
  		 *     the UI element's input DOM element (as defined by the return value
  		 *     of {@link #getInputElement}).
  		 *
  		 * This function is only called at UI element instantiation, but can
  		 * be overridded in child classes if they require more flexibility.
  		 *
  		 * @chainable
  		 * @param {CKEDITOR.dialog.definition.uiElement} definition The UI element
  		 * definition.
  		 */
  		registerEvents: function( definition ) {
  			var regex = /^on([A-Z]\w+)/,
  				match;
  
  			var registerDomEvent = function( uiElement, dialog, eventName, func ) {
  					dialog.on( 'load', function() {
  						uiElement.getInputElement().on( eventName, func, uiElement );
  					} );
  				};
  
  			for ( var i in definition ) {
  				if ( !( match = i.match( regex ) ) )
  					continue;
  				if ( this.eventProcessors[ i ] )
  					this.eventProcessors[ i ].call( this, this._.dialog, definition[ i ] );
  				else
  					registerDomEvent( this, this._.dialog, match[ 1 ].toLowerCase(), definition[ i ] );
  			}
  
  			return this;
  		},
  
  		/**
  		 * The event processor list used by
  		 * {@link CKEDITOR.ui.dialog.uiElement#getInputElement} at UI element
  		 * instantiation. The default list defines three `on*` events:
  		 *
  		 * 1. `onLoad` - Called when the element's parent dialog opens for the
  		 *     first time.
  		 * 2. `onShow` - Called whenever the element's parent dialog opens.
  		 * 3. `onHide` - Called whenever the element's parent dialog closes.
  		 *
  		 *		// This connects the 'click' event in CKEDITOR.ui.dialog.button to onClick
  		 *		// handlers in the UI element's definitions.
  		 *		CKEDITOR.ui.dialog.button.eventProcessors = CKEDITOR.tools.extend( {},
  		 *			CKEDITOR.ui.dialog.uiElement.prototype.eventProcessors,
  		 *			{ onClick : function( dialog, func ) { this.on( 'click', func ); } },
  		 *			true
  		 *		);
  		 *
  		 * @property {Object}
  		 */
  		eventProcessors: {
  			onLoad: function( dialog, func ) {
  				dialog.on( 'load', func, this );
  			},
  
  			onShow: function( dialog, func ) {
  				dialog.on( 'show', func, this );
  			},
  
  			onHide: function( dialog, func ) {
  				dialog.on( 'hide', func, this );
  			}
  		},
  
  		/**
  		 * The default handler for a UI element's access key down event, which
  		 * tries to put focus to the UI element.
  		 *
  		 * Can be overridded in child classes for more sophisticaed behavior.
  		 *
  		 * @param {CKEDITOR.dialog} dialog The parent dialog object.
  		 * @param {String} key The key combination pressed. Since access keys
  		 * are defined to always include the `CTRL` key, its value should always
  		 * include a `'CTRL+'` prefix.
  		 */
  		accessKeyDown: function() {
  			this.focus();
  		},
  
  		/**
  		 * The default handler for a UI element's access key up event, which
  		 * does nothing.
  		 *
  		 * Can be overridded in child classes for more sophisticated behavior.
  		 *
  		 * @param {CKEDITOR.dialog} dialog The parent dialog object.
  		 * @param {String} key The key combination pressed. Since access keys
  		 * are defined to always include the `CTRL` key, its value should always
  		 * include a `'CTRL+'` prefix.
  		 */
  		accessKeyUp: function() {},
  
  		/**
  		 * Disables a UI element.
  		 */
  		disable: function() {
  			var element = this.getElement(),
  				input = this.getInputElement();
  			input.setAttribute( 'disabled', 'true' );
  			element.addClass( 'cke_disabled' );
  		},
  
  		/**
  		 * Enables a UI element.
  		 */
  		enable: function() {
  			var element = this.getElement(),
  				input = this.getInputElement();
  			input.removeAttribute( 'disabled' );
  			element.removeClass( 'cke_disabled' );
  		},
  
  		/**
  		 * Determines whether an UI element is enabled or not.
  		 *
  		 * @returns {Boolean} Whether the UI element is enabled.
  		 */
  		isEnabled: function() {
  			return !this.getElement().hasClass( 'cke_disabled' );
  		},
  
  		/**
  		 * Determines whether an UI element is visible or not.
  		 *
  		 * @returns {Boolean} Whether the UI element is visible.
  		 */
  		isVisible: function() {
  			return this.getInputElement().isVisible();
  		},
  
  		/**
  		 * Determines whether an UI element is focus-able or not.
  		 * Focus-able is defined as being both visible and enabled.
  		 *
  		 * @returns {Boolean} Whether the UI element can be focused.
  		 */
  		isFocusable: function() {
  			if ( !this.isEnabled() || !this.isVisible() )
  				return false;
  			return true;
  		}
  	};
  
  	/** @class CKEDITOR.ui.dialog.hbox */
  	CKEDITOR.ui.dialog.hbox.prototype = CKEDITOR.tools.extend( new CKEDITOR.ui.dialog.uiElement(), {
  		/**
  		 * Gets a child UI element inside this container.
  		 *
  		 *		var checkbox = hbox.getChild( [0,1] );
  		 *		checkbox.setValue( true );
  		 *
  		 * @param {Array/Number} indices An array or a single number to indicate the child's
  		 * position in the container's descendant tree. Omit to get all the children in an array.
  		 * @returns {Array/CKEDITOR.ui.dialog.uiElement} Array of all UI elements in the container
  		 * if no argument given, or the specified UI element if indices is given.
  		 */
  		getChild: function( indices ) {
  			// If no arguments, return a clone of the children array.
  			if ( arguments.length < 1 )
  				return this._.children.concat();
  
  			// If indices isn't array, make it one.
  			if ( !indices.splice )
  				indices = [ indices ];
  
  			// Retrieve the child element according to tree position.
  			if ( indices.length < 2 )
  				return this._.children[ indices[ 0 ] ];
  			else
  				return ( this._.children[ indices[ 0 ] ] && this._.children[ indices[ 0 ] ].getChild ) ? this._.children[ indices[ 0 ] ].getChild( indices.slice( 1, indices.length ) ) : null;
  		}
  	}, true );
  
  	CKEDITOR.ui.dialog.vbox.prototype = new CKEDITOR.ui.dialog.hbox();
  
  	( function() {
  		var commonBuilder = {
  			build: function( dialog, elementDefinition, output ) {
  				var children = elementDefinition.children,
  					child,
  					childHtmlList = [],
  					childObjList = [];
  				for ( var i = 0;
  				( i < children.length && ( child = children[ i ] ) ); i++ ) {
  					var childHtml = [];
  					childHtmlList.push( childHtml );
  					childObjList.push( CKEDITOR.dialog._.uiElementBuilders[ child.type ].build( dialog, child, childHtml ) );
  				}
  				return new CKEDITOR.ui.dialog[ elementDefinition.type ]( dialog, childObjList, childHtmlList, output, elementDefinition );
  			}
  		};
  
  		CKEDITOR.dialog.addUIElement( 'hbox', commonBuilder );
  		CKEDITOR.dialog.addUIElement( 'vbox', commonBuilder );
  	} )();
  
  	/**
  	 * Generic dialog command. It opens a specific dialog when executed.
  	 *
  	 *		// Register the "link" command, which opens the "link" dialog.
  	 *		editor.addCommand( 'link', new CKEDITOR.dialogCommand( 'link' ) );
  	 *
  	 * @class
  	 * @constructor Creates a dialogCommand class instance.
  	 * @extends CKEDITOR.commandDefinition
  	 * @param {String} dialogName The name of the dialog to open when executing
  	 * this command.
  	 * @param {Object} [ext] Additional command definition's properties.
  	 */
  	CKEDITOR.dialogCommand = function( dialogName, ext ) {
  		this.dialogName = dialogName;
  		CKEDITOR.tools.extend( this, ext, true );
  	};
  
  	CKEDITOR.dialogCommand.prototype = {
  		exec: function( editor ) {
  			editor.openDialog( this.dialogName );
  		},
  
  		// Dialog commands just open a dialog ui, thus require no undo logic,
  		// undo support should dedicate to specific dialog implementation.
  		canUndo: false,
  
  		editorFocus: 1
  	};
  
  	( function() {
  		var notEmptyRegex = /^([a]|[^a])+$/,
  			integerRegex = /^\d*$/,
  			numberRegex = /^\d*(?:\.\d+)?$/,
  			htmlLengthRegex = /^(((\d*(\.\d+))|(\d*))(px|\%)?)?$/,
  			cssLengthRegex = /^(((\d*(\.\d+))|(\d*))(px|em|ex|in|cm|mm|pt|pc|\%)?)?$/i,
  			inlineStyleRegex = /^(\s*[\w-]+\s*:\s*[^:;]+(?:;|$))*$/;
  
  		CKEDITOR.VALIDATE_OR = 1;
  		CKEDITOR.VALIDATE_AND = 2;
  
  		CKEDITOR.dialog.validate = {
  			functions: function() {
  				var args = arguments;
  				return function() {
  					/**
  					 * It's important for validate functions to be able to accept the value
  					 * as argument in addition to this.getValue(), so that it is possible to
  					 * combine validate functions together to make more sophisticated
  					 * validators.
  					 */
  					var value = this && this.getValue ? this.getValue() : args[ 0 ];
  
  					var msg,
  						relation = CKEDITOR.VALIDATE_AND,
  						functions = [],
  						i;
  
  					for ( i = 0; i < args.length; i++ ) {
  						if ( typeof args[ i ] == 'function' )
  							functions.push( args[ i ] );
  						else
  							break;
  					}
  
  					if ( i < args.length && typeof args[ i ] == 'string' ) {
  						msg = args[ i ];
  						i++;
  					}
  
  					if ( i < args.length && typeof args[ i ] == 'number' )
  						relation = args[ i ];
  
  					var passed = ( relation == CKEDITOR.VALIDATE_AND ? true : false );
  					for ( i = 0; i < functions.length; i++ ) {
  						if ( relation == CKEDITOR.VALIDATE_AND )
  							passed = passed && functions[ i ]( value );
  						else
  							passed = passed || functions[ i ]( value );
  					}
  
  					return !passed ? msg : true;
  				};
  			},
  
  			regex: function( regex, msg ) {
  				/*
  				 * Can be greatly shortened by deriving from functions validator if code size
  				 * turns out to be more important than performance.
  				 */
  				return function() {
  					var value = this && this.getValue ? this.getValue() : arguments[ 0 ];
  					return !regex.test( value ) ? msg : true;
  				};
  			},
  
  			notEmpty: function( msg ) {
  				return this.regex( notEmptyRegex, msg );
  			},
  
  			integer: function( msg ) {
  				return this.regex( integerRegex, msg );
  			},
  
  			'number': function( msg ) {
  				return this.regex( numberRegex, msg );
  			},
  
  			'cssLength': function( msg ) {
  				return this.functions( function( val ) {
  					return cssLengthRegex.test( CKEDITOR.tools.trim( val ) );
  				}, msg );
  			},
  
  			'htmlLength': function( msg ) {
  				return this.functions( function( val ) {
  					return htmlLengthRegex.test( CKEDITOR.tools.trim( val ) );
  				}, msg );
  			},
  
  			'inlineStyle': function( msg ) {
  				return this.functions( function( val ) {
  					return inlineStyleRegex.test( CKEDITOR.tools.trim( val ) );
  				}, msg );
  			},
  
  			equals: function( value, msg ) {
  				return this.functions( function( val ) {
  					return val == value;
  				}, msg );
  			},
  
  			notEqual: function( value, msg ) {
  				return this.functions( function( val ) {
  					return val != value;
  				}, msg );
  			}
  		};
  
  		CKEDITOR.on( 'instanceDestroyed', function( evt ) {
  			// Remove dialog cover on last instance destroy.
  			if ( CKEDITOR.tools.isEmpty( CKEDITOR.instances ) ) {
  				var currentTopDialog;
  				while ( ( currentTopDialog = CKEDITOR.dialog._.currentTop ) )
  					currentTopDialog.hide();
  				removeCovers();
  			}
  
  			var dialogs = evt.editor._.storedDialogs;
  			for ( var name in dialogs )
  				dialogs[ name ].destroy();
  
  		} );
  
  	} )();
  
  	// Extend the CKEDITOR.editor class with dialog specific functions.
  	CKEDITOR.tools.extend( CKEDITOR.editor.prototype, {
  		/**
  		 * Loads and opens a registered dialog.
  		 *
  		 *		CKEDITOR.instances.editor1.openDialog( 'smiley' );
  		 *
  		 * @member CKEDITOR.editor
  		 * @param {String} dialogName The registered name of the dialog.
  		 * @param {Function} callback The function to be invoked after dialog instance created.
  		 * @returns {CKEDITOR.dialog} The dialog object corresponding to the dialog displayed.
  		 * `null` if the dialog name is not registered.
  		 * @see CKEDITOR.dialog#add
  		 */
  		openDialog: function( dialogName, callback ) {
  			var dialog = null, dialogDefinitions = CKEDITOR.dialog._.dialogDefinitions[ dialogName ];
  
  			if ( CKEDITOR.dialog._.currentTop === null )
  				showCover( this );
  
  			// If the dialogDefinition is already loaded, open it immediately.
  			if ( typeof dialogDefinitions == 'function' ) {
  				var storedDialogs = this._.storedDialogs || ( this._.storedDialogs = {} );
  
  				dialog = storedDialogs[ dialogName ] || ( storedDialogs[ dialogName ] = new CKEDITOR.dialog( this, dialogName ) );
  
  				callback && callback.call( dialog, dialog );
  				dialog.show();
  
  			} else if ( dialogDefinitions == 'failed' ) {
  				hideCover( this );
  				throw new Error( '[CKEDITOR.dialog.openDialog] Dialog "' + dialogName + '" failed when loading definition.' );
  			} else if ( typeof dialogDefinitions == 'string' ) {
  
  				CKEDITOR.scriptLoader.load( CKEDITOR.getUrl( dialogDefinitions ),
  					function() {
  						var dialogDefinition = CKEDITOR.dialog._.dialogDefinitions[ dialogName ];
  						// In case of plugin error, mark it as loading failed.
  						if ( typeof dialogDefinition != 'function' )
  							CKEDITOR.dialog._.dialogDefinitions[ dialogName ] = 'failed';
  
  						this.openDialog( dialogName, callback );
  					}, this, 0, 1 );
  			}
  
  			CKEDITOR.skin.loadPart( 'dialog' );
  
  			return dialog;
  		}
  	} );
  } )();
  
  CKEDITOR.plugins.add( 'dialog', {
  	requires: 'dialogui',
  	init: function( editor ) {
  		editor.on( 'doubleclick', function( evt ) {
  			if ( evt.data.dialog )
  				editor.openDialog( evt.data.dialog );
  		}, null, null, 999 );
  	}
  } );
  
  // Dialog related configurations.
  
  /**
   * The color of the dialog background cover. It should be a valid CSS color string.
   *
   *		config.dialog_backgroundCoverColor = 'rgb(255, 254, 253)';
   *
   * @cfg {String} [dialog_backgroundCoverColor='white']
   * @member CKEDITOR.config
   */
  
  /**
   * The opacity of the dialog background cover. It should be a number within the
   * range `[0.0, 1.0]`.
   *
   *		config.dialog_backgroundCoverOpacity = 0.7;
   *
   * @cfg {Number} [dialog_backgroundCoverOpacity=0.5]
   * @member CKEDITOR.config
   */
  
  /**
   * If the dialog has more than one tab, put focus into the first tab as soon as dialog is opened.
   *
   *		config.dialog_startupFocusTab = true;
   *
   * @cfg {Boolean} [dialog_startupFocusTab=false]
   * @member CKEDITOR.config
   */
  
  /**
   * The distance of magnetic borders used in moving and resizing dialogs,
   * measured in pixels.
   *
   *		config.dialog_magnetDistance = 30;
   *
   * @cfg {Number} [dialog_magnetDistance=20]
   * @member CKEDITOR.config
   */
  
  /**
   * The guideline to follow when generating the dialog buttons. There are 3 possible options:
   *
   * * `'OS'` - the buttons will be displayed in the default order of the user's OS;
   * * `'ltr'` - for Left-To-Right order;
   * * `'rtl'` - for Right-To-Left order.
   *
   * Example:
   *
   *		config.dialog_buttonsOrder = 'rtl';
   *
   * @since 3.5
   * @cfg {String} [dialog_buttonsOrder='OS']
   * @member CKEDITOR.config
   */
  
  /**
   * The dialog contents to removed. It's a string composed by dialog name and tab name with a colon between them.
   *
   * Separate each pair with semicolon (see example).
   *
   * **Note:** All names are case-sensitive.
   *
   * **Note:** Be cautious when specifying dialog tabs that are mandatory,
   * like `'info'`, dialog functionality might be broken because of this!
   *
   *		config.removeDialogTabs = 'flash:advanced;image:Link';
   *
   * @since 3.5
   * @cfg {String} [removeDialogTabs='']
   * @member CKEDITOR.config
   */
  
  /**
   * Tells if user should not be asked to confirm close, if any dialog field was modified.
   * By default it is set to `false` meaning that the confirmation dialog will be shown.
   *
   *		config.dialog_noConfirmCancel = true;
   *
   * @since 4.3
   * @cfg {Boolean} [dialog_noConfirmCancel=false]
   * @member CKEDITOR.config
   */
  
  /**
   * Event fired when a dialog definition is about to be used to create a dialog into
   * an editor instance. This event makes it possible to customize the definition
   * before creating it.
   *
   * Note that this event is called only the first time a specific dialog is
   * opened. Successive openings will use the cached dialog, and this event will
   * not get fired.
   *
   * @event dialogDefinition
   * @member CKEDITOR
   * @param {CKEDITOR.dialog.definition} data The dialog defination that
   * is being loaded.
   * @param {CKEDITOR.editor} editor The editor instance that will use the dialog.
   */
  
  /**
   * Event fired when a tab is going to be selected in a dialog.
   *
   * @event selectPage
   * @member CKEDITOR.dialog
   * @param data
   * @param {String} data.page The id of the page that it's gonna be selected.
   * @param {String} data.currentPage The id of the current page.
   */
  
  /**
   * Event fired when the user tries to dismiss a dialog.
   *
   * @event cancel
   * @member CKEDITOR.dialog
   * @param data
   * @param {Boolean} data.hide Whether the event should proceed or not.
   */
  
  /**
   * Event fired when the user tries to confirm a dialog.
   *
   * @event ok
   * @member CKEDITOR.dialog
   * @param data
   * @param {Boolean} data.hide Whether the event should proceed or not.
   */
  
  /**
   * Event fired when a dialog is shown.
   *
   * @event show
   * @member CKEDITOR.dialog
   */
  
  /**
   * Event fired when a dialog is shown.
   *
   * @event dialogShow
   * @member CKEDITOR.editor
   * @param {CKEDITOR.editor} editor This editor instance.
   * @param {CKEDITOR.dialog} data The opened dialog instance.
   */
  
  /**
   * Event fired when a dialog is hidden.
   *
   * @event hide
   * @member CKEDITOR.dialog
   */
  
  /**
   * Event fired when a dialog is hidden.
   *
   * @event dialogHide
   * @member CKEDITOR.editor
   * @param {CKEDITOR.editor} editor This editor instance.
   * @param {CKEDITOR.dialog} data The hidden dialog instance.
   */
  
  /**
   * Event fired when a dialog is being resized. The event is fired on
   * both the {@link CKEDITOR.dialog} object and the dialog instance
   * since 3.5.3, previously it was only available in the global object.
   *
   * @static
   * @event resize
   * @member CKEDITOR.dialog
   * @param data
   * @param {CKEDITOR.dialog} data.dialog The dialog being resized (if
   * it is fired on the dialog itself, this parameter is not sent).
   * @param {String} data.skin The skin name.
   * @param {Number} data.width The new width.
   * @param {Number} data.height The new height.
   */
  
  /**
   * Event fired when a dialog is being resized. The event is fired on
   * both the {@link CKEDITOR.dialog} object and the dialog instance
   * since 3.5.3, previously it was only available in the global object.
   *
   * @since 3.5
   * @event resize
   * @member CKEDITOR.dialog
   * @param data
   * @param {Number} data.width The new width.
   * @param {Number} data.height The new height.
   */
  
  /**
   * Event fired when the dialog state changes, usually by {@link CKEDITOR.dialog#setState}.
   *
   * @since 4.5
   * @event state
   * @member CKEDITOR.dialog
   * @param data
   * @param {Number} data The new state. Either {@link CKEDITOR#DIALOG_STATE_IDLE} or {@link CKEDITOR#DIALOG_STATE_BUSY}.
   */
  