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[perso/Immae/Projets/packagist/piedsjaloux-ckeditor-component.git] / sources / plugins / dialog / plugin.js

/**
 * @license Copyright (c) 2003-2017, 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 );

                // Don't allow dragging on dialog (http://dev.ckeditor.com/ticket/13184).
                editor.plugins.clipboard && CKEDITOR.plugins.clipboard.preventDefaultDropOnElement( body );

                // IFrame shim for dialog that masks activeX in IE. (http://dev.ckeditor.com/ticket/7619)
                if ( CKEDITOR.env.ie && !CKEDITOR.env.quirks && !CKEDITOR.env.edge ) {
                        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 (http://dev.ckeditor.com/ticket/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 (http://dev.ckeditor.com/ticket/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 (http://dev.ckeditor.com/ticket/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 (http://dev.ckeditor.com/ticket/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 (http://dev.ckeditor.com/ticket/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. (http://dev.ckeditor.com/ticket/4531,http://dev.ckeditor.com/ticket/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 (http://dev.ckeditor.com/ticket/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';

                        // (http://dev.ckeditor.com/ticket/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();

                        // Selects the first tab if no tab is already selected.
                        if ( this._.currentTabId === null ) {
                                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. (http://dev.ckeditor.com/ticket/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. (http://dev.ckeditor.com/ticket/172)
                                setTimeout( function() {
                                        editor.focusManager.unlock();

                                        // Fixed iOS focus issue (http://dev.ckeditor.com/ticket/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 (http://dev.ckeditor.com/ticket/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 (http://dev.ckeditor.com/ticket/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 ) {
                                        var dir = this.getParentEditor().lang.dir,
                                                spinnerDef = {
                                                        attributes: {
                                                                'class': 'cke_dialog_spinner'
                                                        },
                                                        styles: {
                                                                'float': dir == 'rtl' ? 'right' : 'left'
                                                        }
                                                };

                                        spinnerDef.styles[ 'margin-' + ( dir == 'rtl' ? 'left' : 'right' ) ] = '8px';

                                        this.parts.spinner = CKEDITOR.document.createElement( 'div', spinnerDef );

                                        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(),
                        config = editor.config,
                        skinName = ( CKEDITOR.skinName || editor.config.skin ),
                        backgroundColorStyle = config.dialog_backgroundCoverColor || ( skinName == 'moono-lisa' ? 'black' : '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 (http://dev.ckeditor.com/ticket/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. (http://dev.ckeditor.com/ticket/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%' ), ';' );

                                                // (http://dev.ckeditor.com/ticket/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. (http://dev.ckeditor.com/ticket/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.
         * @param {String} [ext.tabId] You can provide additional property (`tabId`) if you wish to open the dialog on a specific tabId.
         *
         *              // Open the dialog on the 'keystroke' tabId.
         *              editor.addCommand( 'keystroke', new CKEDITOR.dialogCommand( 'a11yHelp', { tabId: 'keystroke' } ) );
         */
        CKEDITOR.dialogCommand = function( dialogName, ext ) {
                this.dialogName = dialogName;
                CKEDITOR.tools.extend( this, ext, true );
        };

        CKEDITOR.dialogCommand.prototype = {
                exec: function( editor ) {
                        var tabId = this.tabId;
                        editor.openDialog( this.dialogName, function( dialog ) {
                                // Select different tab if it's provided (#830).
                                if ( tabId ) {
                                        dialog.selectPage( tabId );
                                }
                        } );
                },

                // 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}.
 */