Update to 4.7.3

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

/**
 * @license Copyright (c) 2003-2017, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or http://ckeditor.com/license
 */

/**
 * @fileOverview [Widget](http://ckeditor.com/addon/widget) plugin.
 */

'use strict';

( function() {
        var DRAG_HANDLER_SIZE = 15;

        CKEDITOR.plugins.add( 'widget', {
                // jscs:disable maximumLineLength
                lang: 'af,ar,az,bg,ca,cs,cy,da,de,de-ch,el,en,en-gb,eo,es,es-mx,eu,fa,fi,fr,gl,he,hr,hu,id,it,ja,km,ko,ku,lv,nb,nl,no,oc,pl,pt,pt-br,ru,sk,sl,sq,sv,tr,tt,ug,uk,vi,zh,zh-cn', // %REMOVE_LINE_CORE%
                // jscs:enable maximumLineLength
                requires: 'lineutils,clipboard,widgetselection',
                onLoad: function() {
                        CKEDITOR.addCss(
                                '.cke_widget_wrapper{' +
                                        'position:relative;' +
                                        'outline:none' +
                                '}' +
                                '.cke_widget_inline{' +
                                        'display:inline-block' +
                                '}' +
                                '.cke_widget_wrapper:hover>.cke_widget_element{' +
                                        'outline:2px solid yellow;' +
                                        'cursor:default' +
                                '}' +
                                '.cke_widget_wrapper:hover .cke_widget_editable{' +
                                        'outline:2px solid yellow' +
                                '}' +
                                '.cke_widget_wrapper.cke_widget_focused>.cke_widget_element,' +
                                // We need higher specificity than hover style.
                                '.cke_widget_wrapper .cke_widget_editable.cke_widget_editable_focused{' +
                                        'outline:2px solid #ace' +
                                '}' +
                                '.cke_widget_editable{' +
                                        'cursor:text' +
                                '}' +
                                '.cke_widget_drag_handler_container{' +
                                        'position:absolute;' +
                                        'width:' + DRAG_HANDLER_SIZE + 'px;' +
                                        'height:0;' +
                                        // Initially drag handler should not be visible, until its position will be
                                        // calculated (http://dev.ckeditor.com/ticket/11177).
                                        // We need to hide unpositined handlers, so they don't extend
                                        // widget's outline far to the left (http://dev.ckeditor.com/ticket/12024).
                                        'display:none;' +
                                        'opacity:0.75;' +
                                        'transition:height 0s 0.2s;' + // Delay hiding drag handler.
                                        // Prevent drag handler from being misplaced (http://dev.ckeditor.com/ticket/11198).
                                        'line-height:0' +
                                '}' +
                                '.cke_widget_wrapper:hover>.cke_widget_drag_handler_container{' +
                                        'height:' + DRAG_HANDLER_SIZE + 'px;' +
                                        'transition:none' +
                                '}' +
                                '.cke_widget_drag_handler_container:hover{' +
                                        'opacity:1' +
                                '}' +
                                'img.cke_widget_drag_handler{' +
                                        'cursor:move;' +
                                        'width:' + DRAG_HANDLER_SIZE + 'px;' +
                                        'height:' + DRAG_HANDLER_SIZE + 'px;' +
                                        'display:inline-block' +
                                '}' +
                                '.cke_widget_mask{' +
                                        'position:absolute;' +
                                        'top:0;' +
                                        'left:0;' +
                                        'width:100%;' +
                                        'height:100%;' +
                                        'display:block' +
                                '}' +
                                '.cke_editable.cke_widget_dragging, .cke_editable.cke_widget_dragging *{' +
                                        'cursor:move !important' +
                                '}'
                        );
                },

                beforeInit: function( editor ) {
                        /**
                         * An instance of widget repository. It contains all
                         * {@link CKEDITOR.plugins.widget.repository#registered registered widget definitions} and
                         * {@link CKEDITOR.plugins.widget.repository#instances initialized instances}.
                         *
                         *              editor.widgets.add( 'someName', {
                         *                      // Widget definition...
                         *              } );
                         *
                         *              editor.widgets.registered.someName; // -> Widget definition
                         *
                         * @since 4.3
                         * @readonly
                         * @property {CKEDITOR.plugins.widget.repository} widgets
                         * @member CKEDITOR.editor
                         */
                        editor.widgets = new Repository( editor );
                },

                afterInit: function( editor ) {
                        addWidgetButtons( editor );
                        setupContextMenu( editor );
                }
        } );

        /**
         * Widget repository. It keeps track of all {@link #registered registered widget definitions} and
         * {@link #instances initialized instances}. An instance of the repository is available under
         * the {@link CKEDITOR.editor#widgets} property.
         *
         * @class CKEDITOR.plugins.widget.repository
         * @mixins CKEDITOR.event
         * @constructor Creates a widget repository instance. Note that the widget plugin automatically
         * creates a repository instance which is available under the {@link CKEDITOR.editor#widgets} property.
         * @param {CKEDITOR.editor} editor The editor instance for which the repository will be created.
         */
        function Repository( editor ) {
                /**
                 * The editor instance for which this repository was created.
                 *
                 * @readonly
                 * @property {CKEDITOR.editor} editor
                 */
                this.editor = editor;

                /**
                 * A hash of registered widget definitions (definition name => {@link CKEDITOR.plugins.widget.definition}).
                 *
                 * To register a definition use the {@link #add} method.
                 *
                 * @readonly
                 */
                this.registered = {};

                /**
                 * An object containing initialized widget instances (widget id => {@link CKEDITOR.plugins.widget}).
                 *
                 * @readonly
                 */
                this.instances = {};

                /**
                 * An array of selected widget instances.
                 *
                 * @readonly
                 * @property {CKEDITOR.plugins.widget[]} selected
                 */
                this.selected = [];

                /**
                 * The focused widget instance. See also {@link CKEDITOR.plugins.widget#event-focus}
                 * and {@link CKEDITOR.plugins.widget#event-blur} events.
                 *
                 *              editor.on( 'selectionChange', function() {
                 *                      if ( editor.widgets.focused ) {
                 *                              // Do something when a widget is focused...
                 *                      }
                 *              } );
                 *
                 * @readonly
                 * @property {CKEDITOR.plugins.widget} focused
                 */
                this.focused = null;

                /**
                 * The widget instance that contains the nested editable which is currently focused.
                 *
                 * @readonly
                 * @property {CKEDITOR.plugins.widget} widgetHoldingFocusedEditable
                 */
                this.widgetHoldingFocusedEditable = null;

                this._ = {
                        nextId: 0,
                        upcasts: [],
                        upcastCallbacks: [],
                        filters: {}
                };

                setupWidgetsLifecycle( this );
                setupSelectionObserver( this );
                setupMouseObserver( this );
                setupKeyboardObserver( this );
                setupDragAndDrop( this );
                setupNativeCutAndCopy( this );
        }

        Repository.prototype = {
                /**
                 * Minimum interval between selection checks.
                 *
                 * @private
                 */
                MIN_SELECTION_CHECK_INTERVAL: 500,

                /**
                 * Adds a widget definition to the repository. Fires the {@link CKEDITOR.editor#widgetDefinition} event
                 * which allows to modify the widget definition which is going to be registered.
                 *
                 * @param {String} name The name of the widget definition.
                 * @param {CKEDITOR.plugins.widget.definition} widgetDef Widget definition.
                 * @returns {CKEDITOR.plugins.widget.definition}
                 */
                add: function( name, widgetDef ) {
                        // Create prototyped copy of original widget definition, so we won't modify it.
                        widgetDef = CKEDITOR.tools.prototypedCopy( widgetDef );
                        widgetDef.name = name;

                        widgetDef._ = widgetDef._ || {};

                        this.editor.fire( 'widgetDefinition', widgetDef );

                        if ( widgetDef.template )
                                widgetDef.template = new CKEDITOR.template( widgetDef.template );

                        addWidgetCommand( this.editor, widgetDef );
                        addWidgetProcessors( this, widgetDef );

                        this.registered[ name ] = widgetDef;

                        return widgetDef;
                },

                /**
                 * Adds a callback for element upcasting. Each callback will be executed
                 * for every element which is later tested by upcast methods. If a callback
                 * returns `false`, the element will not be upcasted.
                 *
                 *              // Images with the "banner" class will not be upcasted (e.g. to the image widget).
                 *              editor.widgets.addUpcastCallback( function( element ) {
                 *                      if ( element.name == 'img' && element.hasClass( 'banner' ) )
                 *                              return false;
                 *              } );
                 *
                 * @param {Function} callback
                 * @param {CKEDITOR.htmlParser.element} callback.element
                 */
                addUpcastCallback: function( callback ) {
                        this._.upcastCallbacks.push( callback );
                },

                /**
                 * Checks the selection to update widget states (selection and focus).
                 *
                 * This method is triggered by the {@link #event-checkSelection} event.
                 */
                checkSelection: function() {
                        var sel = this.editor.getSelection(),
                                selectedElement = sel.getSelectedElement(),
                                updater = stateUpdater( this ),
                                widget;

                        // Widget is focused so commit and finish checking.
                        if ( selectedElement && ( widget = this.getByElement( selectedElement, true ) ) )
                                return updater.focus( widget ).select( widget ).commit();

                        var range = sel.getRanges()[ 0 ];

                        // No ranges or collapsed range mean that nothing is selected, so commit and finish checking.
                        if ( !range || range.collapsed )
                                return updater.commit();

                        // Range is not empty, so create walker checking for wrappers.
                        var walker = new CKEDITOR.dom.walker( range ),
                                wrapper;

                        walker.evaluator = Widget.isDomWidgetWrapper;

                        while ( ( wrapper = walker.next() ) )
                                updater.select( this.getByElement( wrapper ) );

                        updater.commit();
                },

                /**
                 * Checks if all widget instances are still present in the DOM.
                 * Destroys those instances that are not present.
                 * Reinitializes widgets on widget wrappers for which widget instances
                 * cannot be found. Takes nested widgets into account, too.
                 *
                 * This method triggers the {@link #event-checkWidgets} event whose listeners
                 * can cancel the method's execution or modify its options.
                 *
                 * @param [options] The options object.
                 * @param {Boolean} [options.initOnlyNew] Initializes widgets only on newly wrapped
                 * widget elements (those which still have the `cke_widget_new` class). When this option is
                 * set to `true`, widgets which were invalidated (e.g. by replacing with a cloned DOM structure)
                 * will not be reinitialized. This makes the check faster.
                 * @param {Boolean} [options.focusInited] If only one widget is initialized by
                 * the method, it will be focused.
                 */
                checkWidgets: function( options ) {
                        this.fire( 'checkWidgets', CKEDITOR.tools.copy( options || {} ) );
                },

                /**
                 * Removes the widget from the editor and moves the selection to the closest
                 * editable position if the widget was focused before.
                 *
                 * @param {CKEDITOR.plugins.widget} widget The widget instance to be deleted.
                 */
                del: function( widget ) {
                        if ( this.focused === widget ) {
                                var editor = widget.editor,
                                        range = editor.createRange(),
                                        found;

                                // If haven't found place for caret on the default side,
                                // try to find it on the other side.
                                if ( !( found = range.moveToClosestEditablePosition( widget.wrapper, true ) ) )
                                        found = range.moveToClosestEditablePosition( widget.wrapper, false );

                                if ( found )
                                        editor.getSelection().selectRanges( [ range ] );
                        }

                        widget.wrapper.remove();
                        this.destroy( widget, true );
                },

                /**
                 * Destroys the widget instance and all its nested widgets (widgets inside its nested editables).
                 *
                 * @param {CKEDITOR.plugins.widget} widget The widget instance to be destroyed.
                 * @param {Boolean} [offline] Whether the widget is offline (detached from the DOM tree) —
                 * in this case the DOM (attributes, classes, etc.) will not be cleaned up.
                 */
                destroy: function( widget, offline ) {
                        if ( this.widgetHoldingFocusedEditable === widget )
                                setFocusedEditable( this, widget, null, offline );

                        widget.destroy( offline );
                        delete this.instances[ widget.id ];
                        this.fire( 'instanceDestroyed', widget );
                },

                /**
                 * Destroys all widget instances.
                 *
                 * @param {Boolean} [offline] Whether the widgets are offline (detached from the DOM tree) —
                 * in this case the DOM (attributes, classes, etc.) will not be cleaned up.
                 * @param {CKEDITOR.dom.element} [container] The container within widgets will be destroyed.
                 * This option will be ignored if the `offline` flag was set to `true`, because in such case
                 * it is not possible to find widgets within the passed block.
                 */
                destroyAll: function( offline, container ) {
                        var widget,
                                id,
                                instances = this.instances;

                        if ( container && !offline ) {
                                var wrappers = container.find( '.cke_widget_wrapper' ),
                                        l = wrappers.count(),
                                        i = 0;

                                // Length is constant, because this is not a live node list.
                                // Note: since querySelectorAll returns nodes in document order,
                                // outer widgets are always placed before their nested widgets and therefore
                                // are destroyed before them.
                                for ( ; i < l; ++i ) {
                                        widget = this.getByElement( wrappers.getItem( i ), true );
                                        // Widget might not be found, because it could be a nested widget,
                                        // which would be destroyed when destroying its parent.
                                        if ( widget )
                                                this.destroy( widget );
                                }

                                return;
                        }

                        for ( id in instances ) {
                                widget = instances[ id ];
                                this.destroy( widget, offline );
                        }
                },

                /**
                 * Finalizes a process of widget creation. This includes:
                 *
                 * * inserting widget element into editor,
                 * * marking widget instance as ready (see {@link CKEDITOR.plugins.widget#event-ready}),
                 * * focusing widget instance.
                 *
                 * This method is used by the default widget's command and is called
                 * after widget's dialog (if set) is closed. It may also be used in a
                 * customized process of widget creation and insertion.
                 *
                 *              widget.once( 'edit', function() {
                 *                      // Finalize creation only of not ready widgets.
                 *                      if ( widget.isReady() )
                 *                              return;
                 *
                 *                      // Cancel edit event to prevent automatic widget insertion.
                 *                      evt.cancel();
                 *
                 *                      CustomDialog.open( widget.data, function saveCallback( savedData ) {
                 *                              // Cache the container, because widget may be destroyed while saving data,
                 *                              // if this process will require some deep transformations.
                 *                              var container = widget.wrapper.getParent();
                 *
                 *                              widget.setData( savedData );
                 *
                 *                              // Widget will be retrieved from container and inserted into editor.
                 *                              editor.widgets.finalizeCreation( container );
                 *                      } );
                 *              } );
                 *
                 * @param {CKEDITOR.dom.element/CKEDITOR.dom.documentFragment} container The element
                 * or document fragment which contains widget wrapper. The container is used, so before
                 * finalizing creation the widget can be freely transformed (even destroyed and reinitialized).
                 */
                finalizeCreation: function( container ) {
                        var wrapper = container.getFirst();
                        if ( wrapper && Widget.isDomWidgetWrapper( wrapper ) ) {
                                this.editor.insertElement( wrapper );

                                var widget = this.getByElement( wrapper );
                                // Fire postponed #ready event.
                                widget.ready = true;
                                widget.fire( 'ready' );
                                widget.focus();
                        }
                },

                /**
                 * Finds a widget instance which contains a given element. The element will be the {@link CKEDITOR.plugins.widget#wrapper wrapper}
                 * of the returned widget or a descendant of this {@link CKEDITOR.plugins.widget#wrapper wrapper}.
                 *
                 *              editor.widgets.getByElement( someWidget.wrapper ); // -> someWidget
                 *              editor.widgets.getByElement( someWidget.parts.caption ); // -> someWidget
                 *
                 *              // Check wrapper only:
                 *              editor.widgets.getByElement( someWidget.wrapper, true ); // -> someWidget
                 *              editor.widgets.getByElement( someWidget.parts.caption, true ); // -> null
                 *
                 * @param {CKEDITOR.dom.element} element The element to be checked.
                 * @param {Boolean} [checkWrapperOnly] If set to `true`, the method will not check wrappers' descendants.
                 * @returns {CKEDITOR.plugins.widget} The widget instance or `null`.
                 */
                getByElement: ( function() {
                        var validWrapperElements = { div: 1, span: 1 };
                        function getWidgetId( element ) {
                                return element.is( validWrapperElements ) && element.data( 'cke-widget-id' );
                        }

                        return function( element, checkWrapperOnly ) {
                                if ( !element )
                                        return null;

                                var id = getWidgetId( element );

                                // There's no need to check element parents if element is a wrapper.
                                if ( !checkWrapperOnly && !id ) {
                                        var limit = this.editor.editable();

                                        // Try to find a closest ascendant which is a widget wrapper.
                                        do {
                                                element = element.getParent();
                                        } while ( element && !element.equals( limit ) && !( id = getWidgetId( element ) ) );
                                }

                                return this.instances[ id ] || null;
                        };
                } )(),

                /**
                 * Initializes a widget on a given element if the widget has not been initialized on it yet.
                 *
                 * @param {CKEDITOR.dom.element} element The future widget element.
                 * @param {String/CKEDITOR.plugins.widget.definition} [widgetDef] Name of a widget or a widget definition.
                 * The widget definition should be previously registered by using the
                 * {@link CKEDITOR.plugins.widget.repository#add} method.
                 * @param [startupData] Widget startup data (has precedence over default one).
                 * @returns {CKEDITOR.plugins.widget} The widget instance or `null` if a widget could not be initialized on
                 * a given element.
                 */
                initOn: function( element, widgetDef, startupData ) {
                        if ( !widgetDef )
                                widgetDef = this.registered[ element.data( 'widget' ) ];
                        else if ( typeof widgetDef == 'string' )
                                widgetDef = this.registered[ widgetDef ];

                        if ( !widgetDef )
                                return null;

                        // Wrap element if still wasn't wrapped (was added during runtime by method that skips dataProcessor).
                        var wrapper = this.wrapElement( element, widgetDef.name );

                        if ( wrapper ) {
                                // Check if widget wrapper is new (widget hasn't been initialized on it yet).
                                // This class will be removed by widget constructor to avoid locking snapshot twice.
                                if ( wrapper.hasClass( 'cke_widget_new' ) ) {
                                        var widget = new Widget( this, this._.nextId++, element, widgetDef, startupData );

                                        // Widget could be destroyed when initializing it.
                                        if ( widget.isInited() ) {
                                                this.instances[ widget.id ] = widget;

                                                return widget;
                                        } else {
                                                return null;
                                        }
                                }

                                // Widget already has been initialized, so try to get widget by element.
                                // Note - it may happen that other instance will returned than the one created above,
                                // if for example widget was destroyed and reinitialized.
                                return this.getByElement( element );
                        }

                        // No wrapper means that there's no widget for this element.
                        return null;
                },

                /**
                 * Initializes widgets on all elements which were wrapped by {@link #wrapElement} and
                 * have not been initialized yet.
                 *
                 * @param {CKEDITOR.dom.element} [container=editor.editable()] The container which will be checked for not
                 * initialized widgets. Defaults to editor's {@link CKEDITOR.editor#editable editable} element.
                 * @returns {CKEDITOR.plugins.widget[]} Array of widget instances which have been initialized.
                 * Note: Only first-level widgets are returned &mdash; without nested widgets.
                 */
                initOnAll: function( container ) {
                        var newWidgets = ( container || this.editor.editable() ).find( '.cke_widget_new' ),
                                newInstances = [],
                                instance;

                        for ( var i = newWidgets.count(); i--; ) {
                                instance = this.initOn( newWidgets.getItem( i ).getFirst( Widget.isDomWidgetElement ) );
                                if ( instance )
                                        newInstances.push( instance );
                        }

                        return newInstances;
                },

                /**
                 * Allows to listen to events on specific types of widgets, even if they are not created yet.
                 *
                 * Please note that this method inherits parameters from the {@link CKEDITOR.event#method-on} method with one
                 * extra parameter at the beginning which is the widget name.
                 *
                 *              editor.widgets.onWidget( 'image', 'action', function( evt ) {
                 *                      // Event `action` occurs on `image` widget.
                 *              } );
                 *
                 * @since 4.5
                 * @param {String} widgetName
                 * @param {String} eventName
                 * @param {Function} listenerFunction
                 * @param {Object} [scopeObj]
                 * @param {Object} [listenerData]
                 * @param {Number} [priority=10]
                 */
                onWidget: function( widgetName ) {
                        var args = Array.prototype.slice.call( arguments );

                        args.shift();

                        for ( var i in this.instances ) {
                                var instance = this.instances[ i ];

                                if ( instance.name == widgetName ) {
                                        instance.on.apply( instance, args );
                                }
                        }

                        this.on( 'instanceCreated', function( evt ) {
                                var widget = evt.data;

                                if ( widget.name == widgetName ) {
                                        widget.on.apply( widget, args );
                                }
                        } );
                },

                /**
                 * Parses element classes string and returns an object
                 * whose keys contain class names. Skips all `cke_*` classes.
                 *
                 * This method is used by the {@link CKEDITOR.plugins.widget#getClasses} method and
                 * may be used when overriding that method.
                 *
                 * @since 4.4
                 * @param {String} classes String (value of `class` attribute).
                 * @returns {Object} Object containing classes or `null` if no classes found.
                 */
                parseElementClasses: function( classes ) {
                        if ( !classes )
                                return null;

                        classes = CKEDITOR.tools.trim( classes ).split( /\s+/ );

                        var cl,
                                obj = {},
                                hasClasses = 0;

                        while ( ( cl = classes.pop() ) ) {
                                if ( cl.indexOf( 'cke_' ) == -1 )
                                        obj[ cl ] = hasClasses = 1;
                        }

                        return hasClasses ? obj : null;
                },

                /**
                 * Wraps an element with a widget's non-editable container.
                 *
                 * If this method is called on an {@link CKEDITOR.htmlParser.element}, then it will
                 * also take care of fixing the DOM after wrapping (the wrapper may not be allowed in element's parent).
                 *
                 * @param {CKEDITOR.dom.element/CKEDITOR.htmlParser.element} element The widget element to be wrapped.
                 * @param {String} [widgetName] The name of the widget definition. Defaults to element's `data-widget`
                 * attribute value.
                 * @returns {CKEDITOR.dom.element/CKEDITOR.htmlParser.element} The wrapper element or `null` if
                 * the widget definition of this name is not registered.
                 */
                wrapElement: function( element, widgetName ) {
                        var wrapper = null,
                                widgetDef,
                                isInline;

                        if ( element instanceof CKEDITOR.dom.element ) {
                                widgetName = widgetName || element.data( 'widget' );
                                widgetDef = this.registered[ widgetName ];

                                if ( !widgetDef )
                                        return null;

                                // Do not wrap already wrapped element.
                                wrapper = element.getParent();
                                if ( wrapper && wrapper.type == CKEDITOR.NODE_ELEMENT && wrapper.data( 'cke-widget-wrapper' ) )
                                        return wrapper;

                                // If attribute isn't already set (e.g. for pasted widget), set it.
                                if ( !element.hasAttribute( 'data-cke-widget-keep-attr' ) )
                                        element.data( 'cke-widget-keep-attr', element.data( 'widget' ) ? 1 : 0 );

                                element.data( 'widget', widgetName );

                                isInline = isWidgetInline( widgetDef, element.getName() );

                                wrapper = new CKEDITOR.dom.element( isInline ? 'span' : 'div' );
                                wrapper.setAttributes( getWrapperAttributes( isInline, widgetName ) );

                                wrapper.data( 'cke-display-name', widgetDef.pathName ? widgetDef.pathName : element.getName() );

                                // Replace element unless it is a detached one.
                                if ( element.getParent( true ) )
                                        wrapper.replace( element );
                                element.appendTo( wrapper );
                        }
                        else if ( element instanceof CKEDITOR.htmlParser.element ) {
                                widgetName = widgetName || element.attributes[ 'data-widget' ];
                                widgetDef = this.registered[ widgetName ];

                                if ( !widgetDef )
                                        return null;

                                wrapper = element.parent;
                                if ( wrapper && wrapper.type == CKEDITOR.NODE_ELEMENT && wrapper.attributes[ 'data-cke-widget-wrapper' ] )
                                        return wrapper;

                                // If attribute isn't already set (e.g. for pasted widget), set it.
                                if ( !( 'data-cke-widget-keep-attr' in element.attributes ) )
                                        element.attributes[ 'data-cke-widget-keep-attr' ] = element.attributes[ 'data-widget' ] ? 1 : 0;
                                if ( widgetName )
                                        element.attributes[ 'data-widget' ] = widgetName;

                                isInline = isWidgetInline( widgetDef, element.name );

                                wrapper = new CKEDITOR.htmlParser.element( isInline ? 'span' : 'div', getWrapperAttributes( isInline, widgetName ) );
                                wrapper.attributes[ 'data-cke-display-name' ] = widgetDef.pathName ? widgetDef.pathName : element.name;

                                var parent = element.parent,
                                        index;

                                // Don't detach already detached element.
                                if ( parent ) {
                                        index = element.getIndex();
                                        element.remove();
                                }

                                wrapper.add( element );

                                // Insert wrapper fixing DOM (splitting parents if wrapper is not allowed inside them).
                                parent && insertElement( parent, index, wrapper );
                        }

                        return wrapper;
                },

                // Expose for tests.
                _tests_createEditableFilter: createEditableFilter
        };

        CKEDITOR.event.implementOn( Repository.prototype );

        /**
         * An event fired when a widget instance is created, but before it is fully initialized.
         *
         * @event instanceCreated
         * @param {CKEDITOR.plugins.widget} data The widget instance.
         */

        /**
         * An event fired when a widget instance was destroyed.
         *
         * See also {@link CKEDITOR.plugins.widget#event-destroy}.
         *
         * @event instanceDestroyed
         * @param {CKEDITOR.plugins.widget} data The widget instance.
         */

        /**
         * An event fired to trigger the selection check.
         *
         * See the {@link #method-checkSelection} method.
         *
         * @event checkSelection
         */

        /**
         * An event fired by the the {@link #method-checkWidgets} method.
         *
         * It can be canceled in order to stop the {@link #method-checkWidgets}
         * method execution or the event listener can modify the method's options.
         *
         * @event checkWidgets
         * @param [data]
         * @param {Boolean} [data.initOnlyNew] Initialize widgets only on newly wrapped
         * widget elements (those which still have the `cke_widget_new` class). When this option is
         * set to `true`, widgets which were invalidated (e.g. by replacing with a cloned DOM structure)
         * will not be reinitialized. This makes the check faster.
         * @param {Boolean} [data.focusInited] If only one widget is initialized by
         * the method, it will be focused.
         */


        /**
         * An instance of a widget. Together with {@link CKEDITOR.plugins.widget.repository} these
         * two classes constitute the core of the Widget System.
         *
         * Note that neither the repository nor the widget instances can be created by using their constructors.
         * A repository instance is automatically set up by the Widget plugin and is accessible under
         * {@link CKEDITOR.editor#widgets}, while widget instances are created and destroyed by the repository.
         *
         * To create a widget, first you need to {@link CKEDITOR.plugins.widget.repository#add register} its
         * {@link CKEDITOR.plugins.widget.definition definition}:
         *
         *              editor.widgets.add( 'simplebox', {
         *                      upcast: function( element ) {
         *                              // Defines which elements will become widgets.
         *                              if ( element.hasClass( 'simplebox' ) )
         *                                      return true;
         *                      },
         *                      init: function() {
         *                              // ...
         *                      }
         *              } );
         *
         * Once the widget definition is registered, widgets will be automatically
         * created when loading data:
         *
         *              editor.setData( '<div class="simplebox">foo</div>', function() {
         *                      console.log( editor.widgets.instances ); // -> An object containing one instance.
         *              } );
         *
         * It is also possible to create instances during runtime by using a command
         * (if a {@link CKEDITOR.plugins.widget.definition#template} property was defined):
         *
         *              // You can execute an automatically defined command to
         *              // insert a new simplebox widget or edit the one currently focused.
         *              editor.execCommand( 'simplebox' );
         *
         * Note: Since CKEditor 4.5 widget's `startupData` can be passed as the command argument:
         *
         *              editor.execCommand( 'simplebox', {
         *                      startupData: {
         *                              align: 'left'
         *                      }
         *              } );
         *
         * A widget can also be created in a completely custom way:
         *
         *              var element = editor.document.createElement( 'div' );
         *              editor.insertElement( element );
         *              var widget = editor.widgets.initOn( element, 'simplebox' );
         *
         * @since 4.3
         * @class CKEDITOR.plugins.widget
         * @mixins CKEDITOR.event
         * @extends CKEDITOR.plugins.widget.definition
         * @constructor Creates an instance of the widget class. Do not use it directly, but instead initialize widgets
         * by using the {@link CKEDITOR.plugins.widget.repository#initOn} method or by the upcasting system.
         * @param {CKEDITOR.plugins.widget.repository} widgetsRepo
         * @param {Number} id Unique ID of this widget instance.
         * @param {CKEDITOR.dom.element} element The widget element.
         * @param {CKEDITOR.plugins.widget.definition} widgetDef Widget's registered definition.
         * @param [startupData] Initial widget data. This data object will overwrite the default data and
         * the data loaded from the DOM.
         */
        function Widget( widgetsRepo, id, element, widgetDef, startupData ) {
                var editor = widgetsRepo.editor;

                // Extend this widget with widgetDef-specific methods and properties.
                CKEDITOR.tools.extend( this, widgetDef, {
                        /**
                         * The editor instance.
                         *
                         * @readonly
                         * @property {CKEDITOR.editor}
                         */
                        editor: editor,

                        /**
                         * This widget's unique (per editor instance) ID.
                         *
                         * @readonly
                         * @property {Number}
                         */
                        id: id,

                        /**
                         * Whether this widget is an inline widget (based on an inline element unless
                         * forced otherwise by {@link CKEDITOR.plugins.widget.definition#inline}).
                         *
                         * **Note:** This option does not allow to turn a block element into an inline widget.
                         * However, it makes it possible to turn an inline element into a block widget or to
                         * force a correct type in case when automatic recognition fails.
                         *
                         * @readonly
                         * @property {Boolean}
                         */
                        inline: element.getParent().getName() == 'span',

                        /**
                         * The widget element &mdash; the element on which the widget was initialized.
                         *
                         * @readonly
                         * @property {CKEDITOR.dom.element} element
                         */
                        element: element,

                        /**
                         * Widget's data object.
                         *
                         * The data can only be set by using the {@link #setData} method.
                         * Changes made to the data fire the {@link #event-data} event.
                         *
                         * @readonly
                         */
                        data: CKEDITOR.tools.extend( {}, typeof widgetDef.defaults == 'function' ? widgetDef.defaults() : widgetDef.defaults ),

                        /**
                         * Indicates if a widget is data-ready. Set to `true` when data from all sources
                         * ({@link CKEDITOR.plugins.widget.definition#defaults}, set in the
                         * {@link #init} method, loaded from the widget's element and startup data coming from the constructor)
                         * are finally loaded. This is immediately followed by the first {@link #event-data}.
                         *
                         * @readonly
                         */
                        dataReady: false,

                        /**
                         * Whether a widget instance was initialized. This means that:
                         *
                         * * An instance was created,
                         * * Its properties were set,
                         * * The `init` method was executed.
                         *
                         * **Note**: The first {@link #event-data} event could not be fired yet which
                         * means that the widget's DOM has not been set up yet. Wait for the {@link #event-ready}
                         * event to be notified when a widget is fully initialized and ready.
                         *
                         * **Note**: Use the {@link #isInited} method to check whether a widget is initialized and
                         * has not been destroyed.
                         *
                         * @readonly
                         */
                        inited: false,

                        /**
                         * Whether a widget instance is ready. This means that the widget is {@link #inited} and
                         * that its DOM was finally set up.
                         *
                         * **Note:** Use the {@link #isReady} method to check whether a widget is ready and
                         * has not been destroyed.
                         *
                         * @readonly
                         */
                        ready: false,

                        // Revert what widgetDef could override (automatic #edit listener).
                        edit: Widget.prototype.edit,

                        /**
                         * The nested editable element which is currently focused.
                         *
                         * @readonly
                         * @property {CKEDITOR.plugins.widget.nestedEditable}
                         */
                        focusedEditable: null,

                        /**
                         * The widget definition from which this instance was created.
                         *
                         * @readonly
                         * @property {CKEDITOR.plugins.widget.definition} definition
                         */
                        definition: widgetDef,

                        /**
                         * Link to the widget repository which created this instance.
                         *
                         * @readonly
                         * @property {CKEDITOR.plugins.widget.repository} repository
                         */
                        repository: widgetsRepo,

                        draggable: widgetDef.draggable !== false,

                        // WAAARNING: Overwrite widgetDef's priv object, because otherwise violent unicorn's gonna visit you.
                        _: {
                                downcastFn: ( widgetDef.downcast && typeof widgetDef.downcast == 'string' ) ?
                                        widgetDef.downcasts[ widgetDef.downcast ] : widgetDef.downcast
                        }
                }, true );

                /**
                 * An object of widget component elements.
                 *
                 * For every `partName => selector` pair in {@link CKEDITOR.plugins.widget.definition#parts},
                 * one `partName => element` pair is added to this object during the widget initialization.
                 *
                 * @readonly
                 * @property {Object} parts
                 */

                /**
                 * The template which will be used to create a new widget element (when the widget's command is executed).
                 * It will be populated with {@link #defaults default values}.
                 *
                 * @readonly
                 * @property {CKEDITOR.template} template
                 */

                /**
                 * The widget wrapper &mdash; a non-editable `div` or `span` element (depending on {@link #inline})
                 * which is a parent of the {@link #element} and widget compontents like the drag handler and the {@link #mask}.
                 * It is the outermost widget element.
                 *
                 * @readonly
                 * @property {CKEDITOR.dom.element} wrapper
                 */

                widgetsRepo.fire( 'instanceCreated', this );

                setupWidget( this, widgetDef );

                this.init && this.init();

                // Finally mark widget as inited.
                this.inited = true;

                setupWidgetData( this, startupData );

                // If at some point (e.g. in #data listener) widget hasn't been destroyed
                // and widget is already attached to document then fire #ready.
                if ( this.isInited() && editor.editable().contains( this.wrapper ) ) {
                        this.ready = true;
                        this.fire( 'ready' );
                }
        }

        Widget.prototype = {
                /**
                 * Adds a class to the widget element. This method is used by
                 * the {@link #applyStyle} method and should be overridden by widgets
                 * which should handle classes differently (e.g. add them to other elements).
                 *
                 * Since 4.6.0 this method also adds a corresponding class prefixed with {@link #WRAPPER_CLASS_PREFIX}
                 * to the widget wrapper element.
                 *
                 * **Note**: This method should not be used directly. Use the {@link #setData} method to
                 * set the `classes` property. Read more in the {@link #setData} documentation.
                 *
                 * See also: {@link #removeClass}, {@link #hasClass}, {@link #getClasses}.
                 *
                 * @since 4.4
                 * @param {String} className The class name to be added.
                 */
                addClass: function( className ) {
                        this.element.addClass( className );
                        this.wrapper.addClass( Widget.WRAPPER_CLASS_PREFIX + className );
                },

                /**
                 * Applies the specified style to the widget. It is highly recommended to use the
                 * {@link CKEDITOR.editor#applyStyle} or {@link CKEDITOR.style#apply} methods instead of
                 * using this method directly, because unlike editor's and style's methods, this one
                 * does not perform any checks.
                 *
                 * By default this method handles only classes defined in the style. It clones existing
                 * classes which are stored in the {@link #property-data widget data}'s `classes` property,
                 * adds new classes, and calls the {@link #setData} method if at least one new class was added.
                 * Then, using the {@link #event-data} event listener widget applies modifications passing
                 * new classes to the {@link #addClass} method.
                 *
                 * If you need to handle classes differently than in the default way, you can override the
                 * {@link #addClass} and related methods. You can also handle other style properties than `classes`
                 * by overriding this method.
                 *
                 * See also: {@link #checkStyleActive}, {@link #removeStyle}.
                 *
                 * @since 4.4
                 * @param {CKEDITOR.style} style The custom widget style to be applied.
                 */
                applyStyle: function( style ) {
                        applyRemoveStyle( this, style, 1 );
                },

                /**
                 * Checks if the specified style is applied to this widget. It is highly recommended to use the
                 * {@link CKEDITOR.style#checkActive} method instead of using this method directly,
                 * because unlike style's method, this one does not perform any checks.
                 *
                 * By default this method handles only classes defined in the style and passes
                 * them to the {@link #hasClass} method. You can override these methods to handle classes
                 * differently or to handle more of the style properties.
                 *
                 * See also: {@link #applyStyle}, {@link #removeStyle}.
                 *
                 * @since 4.4
                 * @param {CKEDITOR.style} style The custom widget style to be checked.
                 * @returns {Boolean} Whether the style is applied to this widget.
                 */
                checkStyleActive: function( style ) {
                        var classes = getStyleClasses( style ),
                                cl;

                        if ( !classes )
                                return false;

                        while ( ( cl = classes.pop() ) ) {
                                if ( !this.hasClass( cl ) )
                                        return false;
                        }
                        return true;
                },

                /**
                 * Destroys this widget instance.
                 *
                 * Use {@link CKEDITOR.plugins.widget.repository#destroy} when possible instead of this method.
                 *
                 * This method fires the {#event-destroy} event.
                 *
                 * @param {Boolean} [offline] Whether a widget is offline (detached from the DOM tree) &mdash;
                 * in this case the DOM (attributes, classes, etc.) will not be cleaned up.
                 */
                destroy: function( offline ) {
                        this.fire( 'destroy' );

                        if ( this.editables ) {
                                for ( var name in this.editables )
                                        this.destroyEditable( name, offline );
                        }

                        if ( !offline ) {
                                if ( this.element.data( 'cke-widget-keep-attr' ) == '0' )
                                        this.element.removeAttribute( 'data-widget' );
                                this.element.removeAttributes( [ 'data-cke-widget-data', 'data-cke-widget-keep-attr' ] );
                                this.element.removeClass( 'cke_widget_element' );
                                this.element.replace( this.wrapper );
                        }

                        this.wrapper = null;
                },

                /**
                 * Destroys a nested editable and all nested widgets.
                 *
                 * @param {String} editableName Nested editable name.
                 * @param {Boolean} [offline] See {@link #method-destroy} method.
                 */
                destroyEditable: function( editableName, offline ) {
                        var editable = this.editables[ editableName ];

                        editable.removeListener( 'focus', onEditableFocus );
                        editable.removeListener( 'blur', onEditableBlur );
                        this.editor.focusManager.remove( editable );

                        if ( !offline ) {
                                this.repository.destroyAll( false, editable );
                                editable.removeClass( 'cke_widget_editable' );
                                editable.removeClass( 'cke_widget_editable_focused' );
                                editable.removeAttributes( [ 'contenteditable', 'data-cke-widget-editable', 'data-cke-enter-mode' ] );
                        }

                        delete this.editables[ editableName ];
                },

                /**
                 * Starts widget editing.
                 *
                 * This method fires the {@link CKEDITOR.plugins.widget#event-edit} event
                 * which may be canceled in order to prevent it from opening a dialog window.
                 *
                 * The dialog window name is obtained from the event's data `dialog` property or
                 * from {@link CKEDITOR.plugins.widget.definition#dialog}.
                 *
                 * @returns {Boolean} Returns `true` if a dialog window was opened.
                 */
                edit: function() {
                        var evtData = { dialog: this.dialog },
                                that = this;

                        // Edit event was blocked or there's no dialog to be automatically opened.
                        if ( this.fire( 'edit', evtData ) === false || !evtData.dialog )
                                return false;

                        this.editor.openDialog( evtData.dialog, function( dialog ) {
                                var showListener,
                                        okListener;

                                // Allow to add a custom dialog handler.
                                if ( that.fire( 'dialog', dialog ) === false )
                                        return;

                                showListener = dialog.on( 'show', function() {
                                        dialog.setupContent( that );
                                } );

                                okListener = dialog.on( 'ok', function() {
                                        // Commit dialog's fields, but prevent from
                                        // firing data event for every field. Fire only one,
                                        // bulk event at the end.
                                        var dataChanged,
                                                dataListener = that.on( 'data', function( evt ) {
                                                        dataChanged = 1;
                                                        evt.cancel();
                                                }, null, null, 0 );

                                        // Create snapshot preceeding snapshot with changed widget...
                                        // TODO it should not be required, but it is and I found similar
                                        // code in dialog#ok listener in dialog/plugin.js.
                                        that.editor.fire( 'saveSnapshot' );
                                        dialog.commitContent( that );

                                        dataListener.removeListener();
                                        if ( dataChanged ) {
                                                that.fire( 'data', that.data );
                                                that.editor.fire( 'saveSnapshot' );
                                        }
                                } );

                                dialog.once( 'hide', function() {
                                        showListener.removeListener();
                                        okListener.removeListener();
                                } );
                        } );

                        return true;
                },

                /**
                 * Returns widget element classes parsed to an object. This method
                 * is used to populate the `classes` property of widget's {@link #property-data}.
                 *
                 * This method reuses {@link CKEDITOR.plugins.widget.repository#parseElementClasses}.
                 * It should be overriden if a widget should handle classes differently (e.g. on other elements).
                 *
                 * See also: {@link #removeClass}, {@link #addClass}, {@link #hasClass}.
                 *
                 * @since 4.4
                 * @returns {Object}
                 */
                getClasses: function() {
                        return this.repository.parseElementClasses( this.element.getAttribute( 'class' ) );
                },

                /**
                 * Checks if the widget element has specified class. This method is used by
                 * the {@link #checkStyleActive} method and should be overriden by widgets
                 * which should handle classes differently (e.g. on other elements).
                 *
                 * See also: {@link #removeClass}, {@link #addClass}, {@link #getClasses}.
                 *
                 * @since 4.4
                 * @param {String} className The class to be checked.
                 * @param {Boolean} Whether a widget has specified class.
                 */
                hasClass: function( className ) {
                        return this.element.hasClass( className );
                },

                /**
                 * Initializes a nested editable.
                 *
                 * **Note**: Only elements from {@link CKEDITOR.dtd#$editable} may become editables.
                 *
                 * @param {String} editableName The nested editable name.
                 * @param {CKEDITOR.plugins.widget.nestedEditable.definition} definition The definition of the nested editable.
                 * @returns {Boolean} Whether an editable was successfully initialized.
                 */
                initEditable: function( editableName, definition ) {
                        // Don't fetch just first element which matched selector but look for a correct one. (http://dev.ckeditor.com/ticket/13334)
                        var editable = this._findOneNotNested( definition.selector );

                        if ( editable && editable.is( CKEDITOR.dtd.$editable ) ) {
                                editable = new NestedEditable( this.editor, editable, {
                                        filter: createEditableFilter.call( this.repository, this.name, editableName, definition )
                                } );
                                this.editables[ editableName ] = editable;

                                editable.setAttributes( {
                                        contenteditable: 'true',
                                        'data-cke-widget-editable': editableName,
                                        'data-cke-enter-mode': editable.enterMode
                                } );

                                if ( editable.filter )
                                        editable.data( 'cke-filter', editable.filter.id );

                                editable.addClass( 'cke_widget_editable' );
                                // This class may be left when d&ding widget which
                                // had focused editable. Clean this class here, not in
                                // cleanUpWidgetElement for performance and code size reasons.
                                editable.removeClass( 'cke_widget_editable_focused' );

                                if ( definition.pathName )
                                        editable.data( 'cke-display-name', definition.pathName );

                                this.editor.focusManager.add( editable );
                                editable.on( 'focus', onEditableFocus, this );
                                CKEDITOR.env.ie && editable.on( 'blur', onEditableBlur, this );

                                // Finally, process editable's data. This data wasn't processed when loading
                                // editor's data, becuase they need to be processed separately, with its own filters and settings.
                                editable._.initialSetData = true;
                                editable.setData( editable.getHtml() );

                                return true;
                        }

                        return false;
                },

                /**
                 * Looks inside wrapper element to find a node that
                 * matches given selector and is not nested in other widget. (http://dev.ckeditor.com/ticket/13334)
                 *
                 * @since 4.5
                 * @private
                 * @param {String} selector Selector to match.
                 * @returns {CKEDITOR.dom.element} Matched element or `null` if a node has not been found.
                 */
                _findOneNotNested: function( selector ) {
                        var matchedElements = this.wrapper.find( selector ),
                                match,
                                closestWrapper;

                        for ( var i = 0; i < matchedElements.count(); i++ ) {
                                match = matchedElements.getItem( i );
                                closestWrapper = match.getAscendant( Widget.isDomWidgetWrapper );

                                // The closest ascendant-wrapper of this match defines to which widget
                                // this match belongs. If the ascendant is this widget's wrapper
                                // it means that the match is not nested in other widget.
                                if ( this.wrapper.equals( closestWrapper ) ) {
                                        return match;
                                }
                        }

                        return null;
                },

                /**
                 * Checks if a widget has already been initialized and has not been destroyed yet.
                 *
                 * See {@link #inited} for more details.
                 *
                 * @returns {Boolean}
                 */
                isInited: function() {
                        return !!( this.wrapper && this.inited );
                },

                /**
                 * Checks if a widget is ready and has not been destroyed yet.
                 *
                 * See {@link #property-ready} for more details.
                 *
                 * @returns {Boolean}
                 */
                isReady: function() {
                        return this.isInited() && this.ready;
                },

                /**
                 * Focuses a widget by selecting it.
                 */
                focus: function() {
                        var sel = this.editor.getSelection();

                        // Fake the selection before focusing editor, to avoid unpreventable viewports scrolling
                        // on Webkit/Blink/IE which is done because there's no selection or selection was somewhere else than widget.
                        if ( sel ) {
                                var isDirty = this.editor.checkDirty();

                                sel.fake( this.wrapper );

                                !isDirty && this.editor.resetDirty();
                        }

                        // Always focus editor (not only when focusManger.hasFocus is false) (because of http://dev.ckeditor.com/ticket/10483).
                        this.editor.focus();
                },

                /**
                 * Removes a class from the widget element. This method is used by
                 * the {@link #removeStyle} method and should be overriden by widgets
                 * which should handle classes differently (e.g. on other elements).
                 *
                 * **Note**: This method should not be used directly. Use the {@link #setData} method to
                 * set the `classes` property. Read more in the {@link #setData} documentation.
                 *
                 * See also: {@link #hasClass}, {@link #addClass}.
                 *
                 * @since 4.4
                 * @param {String} className The class to be removed.
                 */
                removeClass: function( className ) {
                        this.element.removeClass( className );
                        this.wrapper.removeClass( Widget.WRAPPER_CLASS_PREFIX + className );
                },

                /**
                 * Removes the specified style from the widget. It is highly recommended to use the
                 * {@link CKEDITOR.editor#removeStyle} or {@link CKEDITOR.style#remove} methods instead of
                 * using this method directly, because unlike editor's and style's methods, this one
                 * does not perform any checks.
                 *
                 * Read more about how applying/removing styles works in the {@link #applyStyle} method documentation.
                 *
                 * See also {@link #checkStyleActive}, {@link #applyStyle}, {@link #getClasses}.
                 *
                 * @since 4.4
                 * @param {CKEDITOR.style} style The custom widget style to be removed.
                 */
                removeStyle: function( style ) {
                        applyRemoveStyle( this, style, 0 );
                },

                /**
                 * Sets widget value(s) in the {@link #property-data} object.
                 * If the given value(s) modifies current ones, the {@link #event-data} event is fired.
                 *
                 *              this.setData( 'align', 'left' );
                 *              this.data.align; // -> 'left'
                 *
                 *              this.setData( { align: 'right', opened: false } );
                 *              this.data.align; // -> 'right'
                 *              this.data.opened; // -> false
                 *
                 * Set values are stored in {@link #element}'s attribute (`data-cke-widget-data`),
                 * in a JSON string, therefore {@link #property-data} should contain
                 * only serializable data.
                 *
                 * **Note:** A special data property, `classes`, exists. It contains an object with
                 * classes which were returned by the {@link #getClasses} method during the widget initialization.
                 * This property is then used by the {@link #applyStyle} and {@link #removeStyle} methods.
                 * When it is changed (the reference to object must be changed!), the widget updates its classes by
                 * using the {@link #addClass} and {@link #removeClass} methods.
                 *
                 *              // Adding a new class.
                 *              var classes = CKEDITOR.tools.clone( widget.data.classes );
                 *              classes.newClass = 1;
                 *              widget.setData( 'classes', classes );
                 *
                 *              // Removing a class.
                 *              var classes = CKEDITOR.tools.clone( widget.data.classes );
                 *              delete classes.newClass;
                 *              widget.setData( 'classes', classes );
                 *
                 * @param {String/Object} keyOrData
                 * @param {Object} value
                 * @chainable
                 */
                setData: function( key, value ) {
                        var data = this.data,
                                modified = 0;

                        if ( typeof key == 'string' ) {
                                if ( data[ key ] !== value ) {
                                        data[ key ] = value;
                                        modified = 1;
                                }
                        }
                        else {
                                var newData = key;

                                for ( key in newData ) {
                                        if ( data[ key ] !== newData[ key ] ) {
                                                modified = 1;
                                                data[ key ] = newData[ key ];
                                        }
                                }
                        }

                        // Block firing data event and overwriting data element before setupWidgetData is executed.
                        if ( modified && this.dataReady ) {
                                writeDataToElement( this );
                                this.fire( 'data', data );
                        }

                        return this;
                },

                /**
                 * Changes the widget's focus state. This method is executed automatically after
                 * a widget was focused by the {@link #method-focus} method or the selection was moved
                 * out of the widget.
                 *
                 * This is a low-level method which is not integrated with e.g. the undo manager.
                 * Use the {@link #method-focus} method instead.
                 *
                 * @param {Boolean} selected Whether to select or deselect this widget.
                 * @chainable
                 */
                setFocused: function( focused ) {
                        this.wrapper[ focused ? 'addClass' : 'removeClass' ]( 'cke_widget_focused' );
                        this.fire( focused ? 'focus' : 'blur' );
                        return this;
                },

                /**
                 * Changes the widget's select state. This method is executed automatically after
                 * a widget was selected by the {@link #method-focus} method or the selection
                 * was moved out of the widget.
                 *
                 * This is a low-level method which is not integrated with e.g. the undo manager.
                 * Use the {@link #method-focus} method instead or simply change the selection.
                 *
                 * @param {Boolean} selected Whether to select or deselect this widget.
                 * @chainable
                 */
                setSelected: function( selected ) {
                        this.wrapper[ selected ? 'addClass' : 'removeClass' ]( 'cke_widget_selected' );
                        this.fire(  selected ? 'select' : 'deselect' );
                        return this;
                },

                /**
                 * Repositions drag handler according to the widget's element position. Should be called from events, like mouseover.
                 */
                updateDragHandlerPosition: function() {
                        var editor = this.editor,
                                domElement = this.element.$,
                                oldPos = this._.dragHandlerOffset,
                                newPos = {
                                        x: domElement.offsetLeft,
                                        y: domElement.offsetTop - DRAG_HANDLER_SIZE
                                };

                        if ( oldPos && newPos.x == oldPos.x && newPos.y == oldPos.y )
                                return;

                        // We need to make sure that dirty state is not changed (http://dev.ckeditor.com/ticket/11487).
                        var initialDirty = editor.checkDirty();

                        editor.fire( 'lockSnapshot' );
                        this.dragHandlerContainer.setStyles( {
                                top: newPos.y + 'px',
                                left: newPos.x + 'px',
                                display: 'block'
                        } );
                        editor.fire( 'unlockSnapshot' );
                        !initialDirty && editor.resetDirty();

                        this._.dragHandlerOffset = newPos;
                }
        };

        CKEDITOR.event.implementOn( Widget.prototype );

        /**
         * Gets the {@link #isDomNestedEditable nested editable}
         * (returned as a {@link CKEDITOR.dom.element}, not as a {@link CKEDITOR.plugins.widget.nestedEditable})
         * closest to the `node` or the `node` if it is a nested editable itself.
         *
         * @since 4.5
         * @static
         * @param {CKEDITOR.dom.element} guard Stop ancestor search on this node (usually editor's editable).
         * @param {CKEDITOR.dom.node} node Start the search from this node.
         * @returns {CKEDITOR.dom.element/null} Element or `null` if not found.
         */
        Widget.getNestedEditable = function( guard, node ) {
                if ( !node || node.equals( guard ) )
                        return null;

                if ( Widget.isDomNestedEditable( node ) )
                        return node;

                return Widget.getNestedEditable( guard, node.getParent() );
        };

        /**
         * Checks whether the `node` is a widget's drag handle element.
         *
         * @since 4.5
         * @static
         * @param {CKEDITOR.dom.node} node
         * @returns {Boolean}
         */
        Widget.isDomDragHandler = function( node ) {
                return node.type == CKEDITOR.NODE_ELEMENT && node.hasAttribute( 'data-cke-widget-drag-handler' );
        };

        /**
         * Checks whether the `node` is a container of the widget's drag handle element.
         *
         * @since 4.5
         * @static
         * @param {CKEDITOR.dom.node} node
         * @returns {Boolean}
         */
        Widget.isDomDragHandlerContainer = function( node ) {
                return node.type == CKEDITOR.NODE_ELEMENT && node.hasClass( 'cke_widget_drag_handler_container' );
        };

        /**
         * Checks whether the `node` is a {@link CKEDITOR.plugins.widget#editables nested editable}.
         * Note that this function only checks whether it is the right element, not whether
         * the passed `node` is an instance of {@link CKEDITOR.plugins.widget.nestedEditable}.
         *
         * @since 4.5
         * @static
         * @param {CKEDITOR.dom.node} node
         * @returns {Boolean}
         */
        Widget.isDomNestedEditable = function( node ) {
                return node.type == CKEDITOR.NODE_ELEMENT && node.hasAttribute( 'data-cke-widget-editable' );
        };

        /**
         * Checks whether the `node` is a {@link CKEDITOR.plugins.widget#element widget element}.
         *
         * @since 4.5
         * @static
         * @param {CKEDITOR.dom.node} node
         * @returns {Boolean}
         */
        Widget.isDomWidgetElement = function( node ) {
                return node.type == CKEDITOR.NODE_ELEMENT && node.hasAttribute( 'data-widget' );
        };

        /**
         * Checks whether the `node` is a {@link CKEDITOR.plugins.widget#wrapper widget wrapper}.
         *
         * @since 4.5
         * @static
         * @param {CKEDITOR.dom.element} node
         * @returns {Boolean}
         */
        Widget.isDomWidgetWrapper = function( node ) {
                return node.type == CKEDITOR.NODE_ELEMENT && node.hasAttribute( 'data-cke-widget-wrapper' );
        };

        /**
         * Checks whether the `node` is a {@link CKEDITOR.plugins.widget#element widget element}.
         *
         * @since 4.5
         * @static
         * @param {CKEDITOR.htmlParser.node} node
         * @returns {Boolean}
         */
        Widget.isParserWidgetElement = function( node ) {
                return node.type == CKEDITOR.NODE_ELEMENT && !!node.attributes[ 'data-widget' ];
        };

        /**
         * Checks whether the `node` is a {@link CKEDITOR.plugins.widget#wrapper widget wrapper}.
         *
         * @since 4.5
         * @static
         * @param {CKEDITOR.htmlParser.element} node
         * @returns {Boolean}
         */
        Widget.isParserWidgetWrapper = function( node ) {
                return node.type == CKEDITOR.NODE_ELEMENT && !!node.attributes[ 'data-cke-widget-wrapper' ];
        };

        /**
         * Prefix added to wrapper classes. Each class added to the widget element by the {@link #addClass}
         * method will also be added to the wrapper prefixed with it.
         *
         * @since 4.6.0
         * @static
         * @readonly
         * @property {String} [='cke_widget_wrapper_']
         */
        Widget.WRAPPER_CLASS_PREFIX = 'cke_widget_wrapper_';

        /**
         * An event fired when a widget is ready (fully initialized). This event is fired after:
         *
         * * {@link #init} is called,
         * * The first {@link #event-data} event is fired,
         * * A widget is attached to the document.
         *
         * Therefore, in case of widget creation with a command which opens a dialog window, this event
         * will be delayed after the dialog window is closed and the widget is finally inserted into the document.
         *
         * **Note**: If your widget does not use automatic dialog window binding (i.e. you open the dialog window manually)
         * or another situation in which the widget wrapper is not attached to document at the time when it is
         * initialized occurs, you need to take care of firing {@link #event-ready} yourself.
         *
         * See also {@link #property-ready} and {@link #property-inited} properties, and
         * {@link #isReady} and {@link #isInited} methods.
         *
         * @event ready
         */

        /**
         * An event fired when a widget is about to be destroyed, but before it is
         * fully torn down.
         *
         * @event destroy
         */

        /**
         * An event fired when a widget is focused.
         *
         * Widget can be focused by executing {@link #method-focus}.
         *
         * @event focus
         */

        /**
         * An event fired when a widget is blurred.
         *
         * @event blur
         */

        /**
         * An event fired when a widget is selected.
         *
         * @event select
         */

        /**
         * An event fired when a widget is deselected.
         *
         * @event deselect
         */

        /**
         * An event fired by the {@link #method-edit} method. It can be canceled
         * in order to stop the default action (opening a dialog window and/or
         * {@link CKEDITOR.plugins.widget.repository#finalizeCreation finalizing widget creation}).
         *
         * @event edit
         * @param data
         * @param {String} data.dialog Defaults to {@link CKEDITOR.plugins.widget.definition#dialog}
         * and can be changed or set by the listener.
         */

        /**
         * An event fired when a dialog window for widget editing is opened.
         * This event can be canceled in order to handle the editing dialog in a custom manner.
         *
         * @event dialog
         * @param {CKEDITOR.dialog} data The opened dialog window instance.
         */

        /**
         * An event fired when a key is pressed on a focused widget.
         * This event is forwarded from the {@link CKEDITOR.editor#key} event and
         * has the ability to block editor keystrokes if it is canceled.
         *
         * @event key
         * @param data
         * @param {Number} data.keyCode A number representing the key code (or combination).
         */

        /**
         * An event fired when a widget is double clicked.
         *
         * **Note:** If a default editing action is executed on double click (i.e. a widget has a
         * {@link CKEDITOR.plugins.widget.definition#dialog dialog} defined and the {@link #event-doubleclick} event was not
         * canceled), this event will be automatically canceled, so a listener added with the default priority (10)
         * will not be executed. Use a listener with low priority (e.g. 5) to be sure that it will be executed.
         *
         *              widget.on( 'doubleclick', function( evt ) {
         *                      console.log( 'widget#doubleclick' );
         *              }, null, null, 5 );
         *
         * If your widget handles double click in a special way (so the default editing action is not executed),
         * make sure you cancel this event, because otherwise it will be propagated to {@link CKEDITOR.editor#doubleclick}
         * and another feature may step in (e.g. a Link dialog window may be opened if your widget was inside a link).
         *
         * @event doubleclick
         * @param data
         * @param {CKEDITOR.dom.element} data.element The double-clicked element.
         */

        /**
         * An event fired when the context menu is opened for a widget.
         *
         * @event contextMenu
         * @param data The object containing context menu options to be added
         * for this widget. See {@link CKEDITOR.plugins.contextMenu#addListener}.
         */

        /**
         * An event fired when the widget data changed. See the {@link #setData} method and the {@link #property-data} property.
         *
         * @event data
         */



        /**
         * The wrapper class for editable elements inside widgets.
         *
         * Do not use directly. Use {@link CKEDITOR.plugins.widget.definition#editables} or
         * {@link CKEDITOR.plugins.widget#initEditable}.
         *
         * @class CKEDITOR.plugins.widget.nestedEditable
         * @extends CKEDITOR.dom.element
         * @constructor
         * @param {CKEDITOR.editor} editor
         * @param {CKEDITOR.dom.element} element
         * @param config
         * @param {CKEDITOR.filter} [config.filter]
         */
        function NestedEditable( editor, element, config ) {
                // Call the base constructor.
                CKEDITOR.dom.element.call( this, element.$ );
                this.editor = editor;
                this._ = {};
                var filter = this.filter = config.filter;

                // If blockless editable - always use BR mode.
                if ( !CKEDITOR.dtd[ this.getName() ].p )
                        this.enterMode = this.shiftEnterMode = CKEDITOR.ENTER_BR;
                else {
                        this.enterMode = filter ? filter.getAllowedEnterMode( editor.enterMode ) : editor.enterMode;
                        this.shiftEnterMode = filter ? filter.getAllowedEnterMode( editor.shiftEnterMode, true ) : editor.shiftEnterMode;
                }
        }

        NestedEditable.prototype = CKEDITOR.tools.extend( CKEDITOR.tools.prototypedCopy( CKEDITOR.dom.element.prototype ), {
                /**
                 * Sets the editable data. The data will be passed through the {@link CKEDITOR.editor#dataProcessor}
                 * and the {@link CKEDITOR.editor#filter}. This ensures that the data was filtered and prepared to be
                 * edited like the {@link CKEDITOR.editor#method-setData editor data}.
                 *
                 * Before content is changed, all nested widgets are destroyed. Afterwards, after new content is loaded,
                 * all nested widgets are initialized.
                 *
                 * @param {String} data
                 */
                setData: function( data ) {
                        // For performance reasons don't call destroyAll when initializing a nested editable,
                        // because there are no widgets inside.
                        if ( !this._.initialSetData ) {
                                // Destroy all nested widgets before setting data.
                                this.editor.widgets.destroyAll( false, this );
                        }
                        this._.initialSetData = false;

                        data = this.editor.dataProcessor.toHtml( data, {
                                context: this.getName(),
                                filter: this.filter,
                                enterMode: this.enterMode
                        } );
                        this.setHtml( data );

                        this.editor.widgets.initOnAll( this );
                },

                /**
                 * Gets the editable data. Like {@link #setData}, this method will process and filter the data.
                 *
                 * @returns {String}
                 */
                getData: function() {
                        return this.editor.dataProcessor.toDataFormat( this.getHtml(), {
                                context: this.getName(),
                                filter: this.filter,
                                enterMode: this.enterMode
                        } );
                }
        } );

        /**
         * The editor instance.
         *
         * @readonly
         * @property {CKEDITOR.editor} editor
         */

        /**
         * The filter instance if allowed content rules were defined.
         *
         * @readonly
         * @property {CKEDITOR.filter} filter
         */

        /**
         * The enter mode active in this editable.
         * It is determined from editable's name (whether it is a blockless editable),
         * its allowed content rules (if defined) and the default editor's mode.
         *
         * @readonly
         * @property {Number} enterMode
         */

        /**
         * The shift enter move active in this editable.
         *
         * @readonly
         * @property {Number} shiftEnterMode
         */


        //
        // REPOSITORY helpers -----------------------------------------------------
        //

        function addWidgetButtons( editor ) {
                var widgets = editor.widgets.registered,
                        widget,
                        widgetName,
                        widgetButton;

                for ( widgetName in widgets ) {
                        widget = widgets[ widgetName ];

                        // Create button if defined.
                        widgetButton = widget.button;
                        if ( widgetButton && editor.ui.addButton ) {
                                editor.ui.addButton( CKEDITOR.tools.capitalize( widget.name, true ), {
                                        label: widgetButton,
                                        command: widget.name,
                                        toolbar: 'insert,10'
                                } );
                        }
                }
        }

        // Create a command creating and editing widget.
        //
        // @param editor
        // @param {CKEDITOR.plugins.widget.definition} widgetDef
        function addWidgetCommand( editor, widgetDef ) {
                editor.addCommand( widgetDef.name, {
                        exec: function( editor, commandData ) {
                                var focused = editor.widgets.focused;
                                // If a widget of the same type is focused, start editing.
                                if ( focused && focused.name == widgetDef.name )
                                        focused.edit();
                                // Otherwise...
                                // ... use insert method is was defined.
                                else if ( widgetDef.insert )
                                        widgetDef.insert();
                                // ... or create a brand-new widget from template.
                                else if ( widgetDef.template ) {
                                        var defaults = typeof widgetDef.defaults == 'function' ? widgetDef.defaults() : widgetDef.defaults,
                                                element = CKEDITOR.dom.element.createFromHtml( widgetDef.template.output( defaults ) ),
                                                instance,
                                                wrapper = editor.widgets.wrapElement( element, widgetDef.name ),
                                                temp = new CKEDITOR.dom.documentFragment( wrapper.getDocument() );

                                        // Append wrapper to a temporary document. This will unify the environment
                                        // in which #data listeners work when creating and editing widget.
                                        temp.append( wrapper );
                                        instance = editor.widgets.initOn( element, widgetDef, commandData && commandData.startupData );

                                        // Instance could be destroyed during initialization.
                                        // In this case finalize creation if some new widget
                                        // was left in temporary document fragment.
                                        if ( !instance ) {
                                                finalizeCreation();
                                                return;
                                        }

                                        // Listen on edit to finalize widget insertion.
                                        //
                                        // * If dialog was set, then insert widget after dialog was successfully saved or destroy this
                                        // temporary instance.
                                        // * If dialog wasn't set and edit wasn't canceled, insert widget.
                                        var editListener = instance.once( 'edit', function( evt ) {
                                                if ( evt.data.dialog ) {
                                                        instance.once( 'dialog', function( evt ) {
                                                                var dialog = evt.data,
                                                                        okListener,
                                                                        cancelListener;

                                                                // Finalize creation AFTER (20) new data was set.
                                                                okListener = dialog.once( 'ok', finalizeCreation, null, null, 20 );

                                                                cancelListener = dialog.once( 'cancel', function( evt ) {
                                                                        if ( !( evt.data && evt.data.hide === false ) ) {
                                                                                editor.widgets.destroy( instance, true );
                                                                        }
                                                                } );

                                                                dialog.once( 'hide', function() {
                                                                        okListener.removeListener();
                                                                        cancelListener.removeListener();
                                                                } );
                                                        } );
                                                } else {
                                                        // Dialog hasn't been set, so insert widget now.
                                                        finalizeCreation();
                                                }
                                        }, null, null, 999 );

                                        instance.edit();

                                        // Remove listener in case someone canceled it before this
                                        // listener was executed.
                                        editListener.removeListener();
                                }

                                function finalizeCreation() {
                                        editor.widgets.finalizeCreation( temp );
                                }
                        },

                        allowedContent: widgetDef.allowedContent,
                        requiredContent: widgetDef.requiredContent,
                        contentForms: widgetDef.contentForms,
                        contentTransformations: widgetDef.contentTransformations
                } );
        }

        function addWidgetProcessors( widgetsRepo, widgetDef ) {
                var upcast = widgetDef.upcast,
                        upcasts,
                        priority = widgetDef.upcastPriority || 10;

                if ( !upcast )
                        return;

                // Multiple upcasts defined in string.
                if ( typeof upcast == 'string' ) {
                        upcasts = upcast.split( ',' );
                        while ( upcasts.length ) {
                                addUpcast( widgetDef.upcasts[ upcasts.pop() ], widgetDef.name, priority );
                        }
                }
                // Single rule which is automatically activated.
                else {
                        addUpcast( upcast, widgetDef.name, priority );
                }

                function addUpcast( upcast, name, priority ) {
                        // Find index of the first higher (in terms of value) priority upcast.
                        var index = CKEDITOR.tools.getIndex( widgetsRepo._.upcasts, function( element ) {
                                return element[ 2 ] > priority;
                        } );
                        // Add at the end if it is the highest priority so far.
                        if ( index < 0 ) {
                                index = widgetsRepo._.upcasts.length;
                        }

                        widgetsRepo._.upcasts.splice( index, 0, [ upcast, name, priority ] );
                }
        }

        function blurWidget( widgetsRepo, widget ) {
                widgetsRepo.focused = null;

                if ( widget.isInited() ) {
                        var isDirty = widget.editor.checkDirty();

                        // Widget could be destroyed in the meantime - e.g. data could be set.
                        widgetsRepo.fire( 'widgetBlurred', { widget: widget } );
                        widget.setFocused( false );

                        !isDirty && widget.editor.resetDirty();
                }
        }

        function checkWidgets( evt ) {
                var options = evt.data;

                if ( this.editor.mode != 'wysiwyg' )
                        return;

                var editable = this.editor.editable(),
                        instances = this.instances,
                        newInstances, i, count, wrapper, notYetInitialized;

                if ( !editable )
                        return;

                // Remove widgets which have no corresponding elements in DOM.
                for ( i in instances ) {
                        // http://dev.ckeditor.com/ticket/13410 Remove widgets that are ready. This prevents from destroying widgets that are during loading process.
                        if ( instances[ i ].isReady() && !editable.contains( instances[ i ].wrapper ) )
                                this.destroy( instances[ i ], true );
                }

                // Init on all (new) if initOnlyNew option was passed.
                if ( options && options.initOnlyNew )
                        newInstances = this.initOnAll();
                else {
                        var wrappers = editable.find( '.cke_widget_wrapper' );
                        newInstances = [];

                        // Create widgets on existing wrappers if they do not exists.
                        for ( i = 0, count = wrappers.count(); i < count; i++ ) {
                                wrapper = wrappers.getItem( i );
                                notYetInitialized = !this.getByElement( wrapper, true );

                                // Check if:
                                // * there's no instance for this widget
                                // * wrapper is not inside some temporary element like copybin (http://dev.ckeditor.com/ticket/11088)
                                // * it was a nested widget's wrapper which has been detached from DOM,
                                // when nested editable has been initialized (it overwrites its innerHTML
                                // and initializes nested widgets).
                                if ( notYetInitialized && !findParent( wrapper, isDomTemp ) && editable.contains( wrapper ) ) {
                                        // Add cke_widget_new class because otherwise
                                        // widget will not be created on such wrapper.
                                        wrapper.addClass( 'cke_widget_new' );
                                        newInstances.push( this.initOn( wrapper.getFirst( Widget.isDomWidgetElement ) ) );
                                }
                        }
                }

                // If only single widget was initialized and focusInited was passed, focus it.
                if ( options && options.focusInited && newInstances.length == 1 )
                        newInstances[ 0 ].focus();
        }

        // Unwraps widget element and clean up element.
        //
        // This function is used to clean up pasted widgets.
        // It should have similar result to widget#destroy plus
        // some additional adjustments, specific for pasting.
        //
        // @param {CKEDITOR.htmlParser.element} el
        function cleanUpWidgetElement( el ) {
                var parent = el.parent;
                if ( parent.type == CKEDITOR.NODE_ELEMENT && parent.attributes[ 'data-cke-widget-wrapper' ] )
                        parent.replaceWith( el );
        }

        // Similar to cleanUpWidgetElement, but works on DOM and finds
        // widget elements by its own.
        //
        // Unlike cleanUpWidgetElement it will wrap element back.
        //
        // @param {CKEDITOR.dom.element} container
        function cleanUpAllWidgetElements( widgetsRepo, container ) {
                var wrappers = container.find( '.cke_widget_wrapper' ),
                        wrapper, element,
                        i = 0,
                        l = wrappers.count();

                for ( ; i < l; ++i ) {
                        wrapper = wrappers.getItem( i );
                        element = wrapper.getFirst( Widget.isDomWidgetElement );
                        // If wrapper contains widget element - unwrap it and wrap again.
                        if ( element.type == CKEDITOR.NODE_ELEMENT && element.data( 'widget' ) ) {
                                element.replace( wrapper );
                                widgetsRepo.wrapElement( element );
                        } else {
                                // Otherwise - something is wrong... clean this up.
                                wrapper.remove();
                        }
                }
        }

        // Creates {@link CKEDITOR.filter} instance for given widget, editable and rules.
        //
        // Once filter for widget-editable pair is created it is cached, so the same instance
        // will be returned when method is executed again.
        //
        // @param {String} widgetName
        // @param {String} editableName
        // @param {CKEDITOR.plugins.widget.nestedEditableDefinition} editableDefinition The nested editable definition.
        // @returns {CKEDITOR.filter} Filter instance or `null` if rules are not defined.
        // @context CKEDITOR.plugins.widget.repository
        function createEditableFilter( widgetName, editableName, editableDefinition ) {
                if ( !editableDefinition.allowedContent && !editableDefinition.disallowedContent )
                        return null;

                var editables = this._.filters[ widgetName ];

                if ( !editables )
                        this._.filters[ widgetName ] = editables = {};

                var filter = editables[ editableName ];

                if ( !filter ) {
                        filter = editableDefinition.allowedContent ? new CKEDITOR.filter( editableDefinition.allowedContent ) : this.editor.filter.clone();

                        editables[ editableName ] = filter;

                        if ( editableDefinition.disallowedContent ) {
                                filter.disallow( editableDefinition.disallowedContent );
                        }
                }

                return filter;
        }

        // Creates an iterator function which when executed on all
        // elements in DOM tree will gather elements that should be wrapped
        // and initialized as widgets.
        function createUpcastIterator( widgetsRepo ) {
                var toBeWrapped = [],
                        upcasts = widgetsRepo._.upcasts,
                        upcastCallbacks = widgetsRepo._.upcastCallbacks;

                return {
                        toBeWrapped: toBeWrapped,

                        iterator: function( element ) {
                                var upcast, upcasted,
                                        data,
                                        i,
                                        upcastsLength,
                                        upcastCallbacksLength;

                                // Wrapper found - find widget element, add it to be
                                // cleaned up (unwrapped) and wrapped and stop iterating in this branch.
                                if ( 'data-cke-widget-wrapper' in element.attributes ) {
                                        element = element.getFirst( Widget.isParserWidgetElement );

                                        if ( element )
                                                toBeWrapped.push( [ element ] );

                                        // Do not iterate over descendants.
                                        return false;
                                }
                                // Widget element found - add it to be cleaned up (just in case)
                                // and wrapped and stop iterating in this branch.
                                else if ( 'data-widget' in element.attributes ) {
                                        toBeWrapped.push( [ element ] );

                                        // Do not iterate over descendants.
                                        return false;
                                }
                                else if ( ( upcastsLength = upcasts.length ) ) {
                                        // Ignore elements with data-cke-widget-upcasted to avoid multiple upcasts (http://dev.ckeditor.com/ticket/11533).
                                        // Do not iterate over descendants.
                                        if ( element.attributes[ 'data-cke-widget-upcasted' ] )
                                                return false;

                                        // Check element with upcast callbacks first.
                                        // If any of them return false abort upcasting.
                                        for ( i = 0, upcastCallbacksLength = upcastCallbacks.length; i < upcastCallbacksLength; ++i ) {
                                                if ( upcastCallbacks[ i ]( element ) === false )
                                                        return;
                                                // Return nothing in order to continue iterating over ascendants.
                                                // See http://dev.ckeditor.com/ticket/11186#comment:6
                                        }

                                        for ( i = 0; i < upcastsLength; ++i ) {
                                                upcast = upcasts[ i ];
                                                data = {};

                                                if ( ( upcasted = upcast[ 0 ]( element, data ) ) ) {
                                                        // If upcast function returned element, upcast this one.
                                                        // It can be e.g. a new element wrapping the original one.
                                                        if ( upcasted instanceof CKEDITOR.htmlParser.element )
                                                                element = upcasted;

                                                        // Set initial data attr with data from upcast method.
                                                        element.attributes[ 'data-cke-widget-data' ] = encodeURIComponent( JSON.stringify( data ) );
                                                        element.attributes[ 'data-cke-widget-upcasted' ] = 1;

                                                        toBeWrapped.push( [ element, upcast[ 1 ] ] );

                                                        // Do not iterate over descendants.
                                                        return false;
                                                }
                                        }
                                }
                        }
                };
        }

        // Finds a first parent that matches query.
        //
        // @param {CKEDITOR.dom.element} element
        // @param {Function} query
        function findParent( element, query ) {
                var parent = element;

                while ( ( parent = parent.getParent() ) ) {
                        if ( query( parent ) )
                                return true;
                }
                return false;
        }

        function getWrapperAttributes( inlineWidget, name ) {
                return {
                        // tabindex="-1" means that it can receive focus by code.
                        tabindex: -1,
                        contenteditable: 'false',
                        'data-cke-widget-wrapper': 1,
                        'data-cke-filter': 'off',
                        // Class cke_widget_new marks widgets which haven't been initialized yet.
                        'class': 'cke_widget_wrapper cke_widget_new cke_widget_' +
                                ( inlineWidget ? 'inline' : 'block' ) +
                                ( name ? ' cke_widget_' + name : '' )
                };
        }

        // Inserts element at given index.
        // It will check DTD and split ancestor elements up to the first
        // that can contain this element.
        //
        // @param {CKEDITOR.htmlParser.element} parent
        // @param {Number} index
        // @param {CKEDITOR.htmlParser.element} element
        function insertElement( parent, index, element ) {
                // Do not split doc fragment...
                if ( parent.type == CKEDITOR.NODE_ELEMENT ) {
                        var parentAllows = CKEDITOR.dtd[ parent.name ];
                        // Parent element is known (included in DTD) and cannot contain
                        // this element.
                        if ( parentAllows && !parentAllows[ element.name ] ) {
                                var parent2 = parent.split( index ),
                                        parentParent = parent.parent;

                                // Element will now be inserted at right parent's index.
                                index = parent2.getIndex();

                                // If left part of split is empty - remove it.
                                if ( !parent.children.length ) {
                                        index -= 1;
                                        parent.remove();
                                }

                                // If right part of split is empty - remove it.
                                if ( !parent2.children.length )
                                        parent2.remove();

                                // Try inserting as grandpas' children.
                                return insertElement( parentParent, index, element );
                        }
                }

                // Finally we can add this element.
                parent.add( element, index );
        }

        // Checks whether for the given widget definition and element widget should be created in inline or block mode.
        //
        // See also: {@link CKEDITOR.plugins.widget.definition#inline} and {@link CKEDITOR.plugins.widget#element}.
        //
        // @param {CKEDITOR.plugins.widget.definition} widgetDef The widget definition.
        // @param {String} elementName The name of the widget element.
        // @returns {Boolean}
        function isWidgetInline( widgetDef, elementName ) {
                return typeof widgetDef.inline == 'boolean' ? widgetDef.inline : !!CKEDITOR.dtd.$inline[ elementName ];
        }

        // @param {CKEDITOR.dom.element}
        // @returns {Boolean}
        function isDomTemp( element ) {
                return element.hasAttribute( 'data-cke-temp' );
        }

        function onEditableKey( widget, keyCode ) {
                var focusedEditable = widget.focusedEditable,
                        range;

                // CTRL+A.
                if ( keyCode == CKEDITOR.CTRL + 65 ) {
                        var bogus = focusedEditable.getBogus();

                        range = widget.editor.createRange();
                        range.selectNodeContents( focusedEditable );
                        // Exclude bogus if exists.
                        if ( bogus )
                                range.setEndAt( bogus, CKEDITOR.POSITION_BEFORE_START );

                        range.select();
                        // Cancel event - block default.
                        return false;
                }
                // DEL or BACKSPACE.
                else if ( keyCode == 8 || keyCode == 46 ) {
                        var ranges = widget.editor.getSelection().getRanges();

                        range = ranges[ 0 ];

                        // Block del or backspace if at editable's boundary.
                        return !( ranges.length == 1 && range.collapsed &&
                                range.checkBoundaryOfElement( focusedEditable, CKEDITOR[ keyCode == 8 ? 'START' : 'END' ] ) );
                }
        }

        function setFocusedEditable( widgetsRepo, widget, editableElement, offline ) {
                var editor = widgetsRepo.editor;

                editor.fire( 'lockSnapshot' );

                if ( editableElement ) {
                        var editableName = editableElement.data( 'cke-widget-editable' ),
                                editableInstance = widget.editables[ editableName ];

                        widgetsRepo.widgetHoldingFocusedEditable = widget;
                        widget.focusedEditable = editableInstance;
                        editableElement.addClass( 'cke_widget_editable_focused' );

                        if ( editableInstance.filter )
                                editor.setActiveFilter( editableInstance.filter );
                        editor.setActiveEnterMode( editableInstance.enterMode, editableInstance.shiftEnterMode );
                } else {
                        if ( !offline )
                                widget.focusedEditable.removeClass( 'cke_widget_editable_focused' );

                        widget.focusedEditable = null;
                        widgetsRepo.widgetHoldingFocusedEditable = null;
                        editor.setActiveFilter( null );
                        editor.setActiveEnterMode( null, null );
                }

                editor.fire( 'unlockSnapshot' );
        }

        function setupContextMenu( editor ) {
                if ( !editor.contextMenu )
                        return;

                editor.contextMenu.addListener( function( element ) {
                        var widget = editor.widgets.getByElement( element, true );

                        if ( widget )
                                return widget.fire( 'contextMenu', {} );
                } );
        }

        // And now we've got two problems - original problem and RegExp.
        // Some softeners:
        // * FF tends to copy all blocks up to the copybin container.
        // * IE tends to copy only the copybin, without its container.
        // * We use spans on IE and blockless editors, but divs in other cases.
        var pasteReplaceRegex = new RegExp(
                '^' +
                '(?:<(?:div|span)(?: data-cke-temp="1")?(?: id="cke_copybin")?(?: data-cke-temp="1")?>)?' +
                        '(?:<(?:div|span)(?: style="[^"]+")?>)?' +
                                '<span [^>]*data-cke-copybin-start="1"[^>]*>.?</span>([\\s\\S]+)<span [^>]*data-cke-copybin-end="1"[^>]*>.?</span>' +
                        '(?:</(?:div|span)>)?' +
                '(?:</(?:div|span)>)?' +
                '$',
                // IE8 prefers uppercase when browsers stick to lowercase HTML (http://dev.ckeditor.com/ticket/13460).
                'i'
        );

        function pasteReplaceFn( match, wrapperHtml ) {
                // Avoid polluting pasted data with any whitspaces,
                // what's going to break check whether only one widget was pasted.
                return CKEDITOR.tools.trim( wrapperHtml );
        }

        function setupDragAndDrop( widgetsRepo ) {
                var editor = widgetsRepo.editor,
                        lineutils = CKEDITOR.plugins.lineutils;

                // These listeners handle inline and block widgets drag and drop.
                // The only thing we need to do to make block widgets custom drag and drop functionality
                // is to fire those events with the right properties (like the target which must be the drag handle).
                editor.on( 'dragstart', function( evt ) {
                        var target = evt.data.target;

                        if ( Widget.isDomDragHandler( target ) ) {
                                var widget = widgetsRepo.getByElement( target );

                                evt.data.dataTransfer.setData( 'cke/widget-id', widget.id );

                                // IE needs focus.
                                editor.focus();

                                // and widget need to be focused on drag start (http://dev.ckeditor.com/ticket/12172#comment:10).
                                widget.focus();
                        }
                } );

                editor.on( 'drop', function( evt ) {
                        var dataTransfer = evt.data.dataTransfer,
                                id = dataTransfer.getData( 'cke/widget-id' ),
                                transferType = dataTransfer.getTransferType( editor ),
                                dragRange = editor.createRange(),
                                sourceWidget;

                        // Disable cross-editor drag & drop for widgets - http://dev.ckeditor.com/ticket/13599.
                        if ( id !== '' && transferType === CKEDITOR.DATA_TRANSFER_CROSS_EDITORS ) {
                                evt.cancel();
                                return;
                        }

                        if ( id === '' || transferType != CKEDITOR.DATA_TRANSFER_INTERNAL ) {
                                return;
                        }

                        sourceWidget = widgetsRepo.instances[ id ];
                        if ( !sourceWidget ) {
                                return;
                        }

                        dragRange.setStartBefore( sourceWidget.wrapper );
                        dragRange.setEndAfter( sourceWidget.wrapper );
                        evt.data.dragRange = dragRange;

                        // [IE8-9] Reset state of the clipboard#fixSplitNodesAfterDrop fix because by setting evt.data.dragRange
                        // (see above) after drop happened we do not need it. That fix is needed only if dragRange was created
                        // before drop (before text node was split).
                        delete CKEDITOR.plugins.clipboard.dragStartContainerChildCount;
                        delete CKEDITOR.plugins.clipboard.dragEndContainerChildCount;

                        evt.data.dataTransfer.setData( 'text/html', editor.editable().getHtmlFromRange( dragRange ).getHtml() );
                        editor.widgets.destroy( sourceWidget, true );
                } );

                editor.on( 'contentDom', function() {
                        var editable = editor.editable();

                        // Register Lineutils's utilities as properties of repo.
                        CKEDITOR.tools.extend( widgetsRepo, {
                                finder: new lineutils.finder( editor, {
                                        lookups: {
                                                // Element is block but not list item and not in nested editable.
                                                'default': function( el ) {
                                                        if ( el.is( CKEDITOR.dtd.$listItem ) )
                                                                return;

                                                        if ( !el.is( CKEDITOR.dtd.$block ) )
                                                                return;

                                                        // Allow drop line inside, but never before or after nested editable (http://dev.ckeditor.com/ticket/12006).
                                                        if ( Widget.isDomNestedEditable( el ) )
                                                                return;

                                                        // Do not allow droping inside the widget being dragged (http://dev.ckeditor.com/ticket/13397).
                                                        if ( widgetsRepo._.draggedWidget.wrapper.contains( el ) ) {
                                                                return;
                                                        }

                                                        // If element is nested editable, make sure widget can be dropped there (http://dev.ckeditor.com/ticket/12006).
                                                        var nestedEditable = Widget.getNestedEditable( editable, el );
                                                        if ( nestedEditable ) {
                                                                var draggedWidget = widgetsRepo._.draggedWidget;

                                                                // Don't let the widget to be dropped into its own nested editable.
                                                                if ( widgetsRepo.getByElement( nestedEditable ) == draggedWidget )
                                                                        return;

                                                                var filter = CKEDITOR.filter.instances[ nestedEditable.data( 'cke-filter' ) ],
                                                                        draggedRequiredContent = draggedWidget.requiredContent;

                                                                // There will be no relation if the filter of nested editable does not allow
                                                                // requiredContent of dragged widget.
                                                                if ( filter && draggedRequiredContent && !filter.check( draggedRequiredContent ) )
                                                                        return;
                                                        }

                                                        return CKEDITOR.LINEUTILS_BEFORE | CKEDITOR.LINEUTILS_AFTER;
                                                }
                                        }
                                } ),
                                locator: new lineutils.locator( editor ),
                                liner: new lineutils.liner( editor, {
                                        lineStyle: {
                                                cursor: 'move !important',
                                                'border-top-color': '#666'
                                        },
                                        tipLeftStyle: {
                                                'border-left-color': '#666'
                                        },
                                        tipRightStyle: {
                                                'border-right-color': '#666'
                                        }
                                } )
                        }, true );
                } );
        }

        // Setup mouse observer which will trigger:
        // * widget focus on widget click,
        // * widget#doubleclick forwarded from editor#doubleclick.
        function setupMouseObserver( widgetsRepo ) {
                var editor = widgetsRepo.editor;

                editor.on( 'contentDom', function() {
                        var editable = editor.editable(),
                                evtRoot = editable.isInline() ? editable : editor.document,
                                widget,
                                mouseDownOnDragHandler;

                        editable.attachListener( evtRoot, 'mousedown', function( evt ) {
                                var target = evt.data.getTarget();

                                // Clicking scrollbar in Chrome will invoke event with target object of document type (#663).
                                // In IE8 the target object will be empty (http://dev.ckeditor.com/ticket/10887).
                                // We need to check if target is a proper element.
                                widget = ( target instanceof CKEDITOR.dom.element ) ? widgetsRepo.getByElement( target ) : null;

                                mouseDownOnDragHandler = 0; // Reset.

                                // Widget was clicked, but not editable nested in it.
                                if ( widget ) {
                                        // Ignore mousedown on drag and drop handler if the widget is inline.
                                        // Block widgets are handled by Lineutils.
                                        if ( widget.inline && target.type == CKEDITOR.NODE_ELEMENT && target.hasAttribute( 'data-cke-widget-drag-handler' ) ) {
                                                mouseDownOnDragHandler = 1;

                                                // When drag handler is pressed we have to clear current selection if it wasn't already on this widget.
                                                // Otherwise, the selection may be in a fillingChar, which prevents dragging a widget. (http://dev.ckeditor.com/ticket/13284, see comment 8 and 9.)
                                                if ( widgetsRepo.focused != widget )
                                                        editor.getSelection().removeAllRanges();

                                                return;
                                        }

                                        if ( !Widget.getNestedEditable( widget.wrapper, target ) ) {
                                                evt.data.preventDefault();
                                                if ( !CKEDITOR.env.ie )
                                                        widget.focus();
                                        } else {
                                                // Reset widget so mouseup listener is not confused.
                                                widget = null;
                                        }
                                }
                        } );

                        // Focus widget on mouseup if mousedown was fired on drag handler.
                        // Note: mouseup won't be fired at all if widget was dragged and dropped, so
                        // this code will be executed only when drag handler was clicked.
                        editable.attachListener( evtRoot, 'mouseup', function() {
                                // Check if widget is not destroyed (if widget is destroyed the wrapper will be null).
                                if ( mouseDownOnDragHandler && widget && widget.wrapper ) {
                                        mouseDownOnDragHandler = 0;
                                        widget.focus();
                                }
                        } );

                        // On IE it is not enough to block mousedown. If widget wrapper (element with
                        // contenteditable=false attribute) is clicked directly (it is a target),
                        // then after mouseup/click IE will select that element.
                        // It is not possible to prevent that default action,
                        // so we force fake selection after everything happened.
                        if ( CKEDITOR.env.ie ) {
                                editable.attachListener( evtRoot, 'mouseup', function() {
                                        setTimeout( function() {
                                                // Check if widget is not destroyed (if widget is destroyed the wrapper will be null) and
                                                // in editable contains widget (it could be dragged and removed).
                                                if ( widget && widget.wrapper && editable.contains( widget.wrapper ) ) {
                                                        widget.focus();
                                                        widget = null;
                                                }
                                        } );
                                } );
                        }
                } );

                editor.on( 'doubleclick', function( evt ) {
                        var widget = widgetsRepo.getByElement( evt.data.element );

                        // Not in widget or in nested editable.
                        if ( !widget || Widget.getNestedEditable( widget.wrapper, evt.data.element ) )
                                return;

                        return widget.fire( 'doubleclick', { element: evt.data.element } );
                }, null, null, 1 );
        }

        // Setup editor#key observer which will forward it
        // to focused widget.
        function setupKeyboardObserver( widgetsRepo ) {
                var editor = widgetsRepo.editor;

                editor.on( 'key', function( evt ) {
                        var focused = widgetsRepo.focused,
                                widgetHoldingFocusedEditable = widgetsRepo.widgetHoldingFocusedEditable,
                                ret;

                        if ( focused )
                                ret = focused.fire( 'key', { keyCode: evt.data.keyCode } );
                        else if ( widgetHoldingFocusedEditable )
                                ret = onEditableKey( widgetHoldingFocusedEditable, evt.data.keyCode );

                        return ret;
                }, null, null, 1 );
        }

        // Setup copybin on native copy and cut events in order to handle copy and cut commands
        // if user accepted security alert on IEs.
        // Note: when copying or cutting using keystroke, copySingleWidget will be first executed
        // by the keydown listener. Conflict between two calls will be resolved by copy_bin existence check.
        function setupNativeCutAndCopy( widgetsRepo ) {
                var editor = widgetsRepo.editor;

                editor.on( 'contentDom', function() {
                        var editable = editor.editable();

                        editable.attachListener( editable, 'copy', eventListener );
                        editable.attachListener( editable, 'cut', eventListener );
                } );

                function eventListener( evt ) {
                        if ( widgetsRepo.focused )
                                copySingleWidget( widgetsRepo.focused, evt.name == 'cut' );
                }
        }

        // Setup selection observer which will trigger:
        // * widget select & focus on selection change,
        // * nested editable focus (related properites and classes) on selection change,
        // * deselecting and blurring all widgets on data,
        // * blurring widget on editor blur.
        function setupSelectionObserver( widgetsRepo ) {
                var editor = widgetsRepo.editor;

                editor.on( 'selectionCheck', function() {
                        widgetsRepo.fire( 'checkSelection' );
                } );

                widgetsRepo.on( 'checkSelection', widgetsRepo.checkSelection, widgetsRepo );

                editor.on( 'selectionChange', function( evt ) {
                        var nestedEditable = Widget.getNestedEditable( editor.editable(), evt.data.selection.getStartElement() ),
                                newWidget = nestedEditable && widgetsRepo.getByElement( nestedEditable ),
                                oldWidget = widgetsRepo.widgetHoldingFocusedEditable;

                        if ( oldWidget ) {
                                if ( oldWidget !== newWidget || !oldWidget.focusedEditable.equals( nestedEditable ) ) {
                                        setFocusedEditable( widgetsRepo, oldWidget, null );

                                        if ( newWidget && nestedEditable )
                                                setFocusedEditable( widgetsRepo, newWidget, nestedEditable );
                                }
                        }
                        // It may happen that there's no widget even if editable was found -
                        // e.g. if selection was automatically set in editable although widget wasn't initialized yet.
                        else if ( newWidget && nestedEditable ) {
                                setFocusedEditable( widgetsRepo, newWidget, nestedEditable );
                        }
                } );

                // Invalidate old widgets early - immediately on dataReady.
                editor.on( 'dataReady', function() {
                        // Deselect and blur all widgets.
                        stateUpdater( widgetsRepo ).commit();
                } );

                editor.on( 'blur', function() {
                        var widget;

                        if ( ( widget = widgetsRepo.focused ) )
                                blurWidget( widgetsRepo, widget );

                        if ( ( widget = widgetsRepo.widgetHoldingFocusedEditable ) )
                                setFocusedEditable( widgetsRepo, widget, null );
                } );
        }

        // Set up actions like:
        // * processing in toHtml/toDataFormat,
        // * pasting handling,
        // * insertion handling,
        // * editable reload handling (setData, mode switch, undo/redo),
        // * DOM invalidation handling,
        // * widgets checks.
        function setupWidgetsLifecycle( widgetsRepo ) {
                setupWidgetsLifecycleStart( widgetsRepo );
                setupWidgetsLifecycleEnd( widgetsRepo );

                widgetsRepo.on( 'checkWidgets', checkWidgets );
                widgetsRepo.editor.on( 'contentDomInvalidated', widgetsRepo.checkWidgets, widgetsRepo );
        }

        function setupWidgetsLifecycleEnd( widgetsRepo ) {
                var editor = widgetsRepo.editor,
                        downcastingSessions = {};

                // Listen before htmlDP#htmlFilter is applied to cache all widgets, because we'll
                // loose data-cke-* attributes.
                editor.on( 'toDataFormat', function( evt ) {
                        // To avoid conflicts between htmlDP#toDF calls done at the same time
                        // (e.g. nestedEditable#getData called during downcasting some widget)
                        // mark every toDataFormat event chain with the downcasting session id.
                        var id = CKEDITOR.tools.getNextNumber(),
                                toBeDowncasted = [];
                        evt.data.downcastingSessionId = id;
                        downcastingSessions[ id ] = toBeDowncasted;

                        evt.data.dataValue.forEach( function( element ) {
                                var attrs = element.attributes,
                                        widget, widgetElement;

                                // Wrapper.
                                // Perform first part of downcasting (cleanup) and cache widgets,
                                // because after applying DP's filter all data-cke-* attributes will be gone.
                                if ( 'data-cke-widget-id' in attrs ) {
                                        widget = widgetsRepo.instances[ attrs[ 'data-cke-widget-id' ] ];
                                        if ( widget ) {
                                                widgetElement = element.getFirst( Widget.isParserWidgetElement );
                                                toBeDowncasted.push( {
                                                        wrapper: element,
                                                        element: widgetElement,
                                                        widget: widget,
                                                        editables: {}
                                                } );

                                                // If widget did not have data-cke-widget attribute before upcasting remove it.
                                                if ( widgetElement.attributes[ 'data-cke-widget-keep-attr' ] != '1' )
                                                        delete widgetElement.attributes[ 'data-widget' ];
                                        }
                                }
                                // Nested editable.
                                else if ( 'data-cke-widget-editable' in attrs ) {
                                        // Save the reference to this nested editable in the closest widget to be downcasted.
                                        // Nested editables are downcasted in the successive toDataFormat to create an opportunity
                                        // for dataFilter's "excludeNestedEditable" option to do its job (that option relies on
                                        // contenteditable="true" attribute) (http://dev.ckeditor.com/ticket/11372).
                                        toBeDowncasted[ toBeDowncasted.length - 1 ].editables[ attrs[ 'data-cke-widget-editable' ] ] = element;

                                        // Don't check children - there won't be next wrapper or nested editable which we
                                        // should process in this session.
                                        return false;
                                }
                        }, CKEDITOR.NODE_ELEMENT, true );
                }, null, null, 8 );

                // Listen after dataProcessor.htmlFilter and ACF were applied
                // so wrappers securing widgets' contents are removed after all filtering was done.
                editor.on( 'toDataFormat', function( evt ) {
                        // Ignore some unmarked sessions.
                        if ( !evt.data.downcastingSessionId )
                                return;

                        var toBeDowncasted = downcastingSessions[ evt.data.downcastingSessionId ],
                                toBe, widget, widgetElement, retElement, editableElement, e;

                        while ( ( toBe = toBeDowncasted.shift() ) ) {
                                widget = toBe.widget;
                                widgetElement = toBe.element;
                                retElement = widget._.downcastFn && widget._.downcastFn.call( widget, widgetElement );

                                // Replace nested editables' content with their output data.
                                for ( e in toBe.editables ) {
                                        editableElement = toBe.editables[ e ];

                                        delete editableElement.attributes.contenteditable;
                                        editableElement.setHtml( widget.editables[ e ].getData() );
                                }

                                // Returned element always defaults to widgetElement.
                                if ( !retElement )
                                        retElement = widgetElement;

                                toBe.wrapper.replaceWith( retElement );
                        }
                }, null, null, 13 );


                editor.on( 'contentDomUnload', function() {
                        widgetsRepo.destroyAll( true );
                } );
        }

        function setupWidgetsLifecycleStart( widgetsRepo ) {
                var editor = widgetsRepo.editor,
                        processedWidgetOnly,
                        snapshotLoaded;

                // Listen after ACF (so data are filtered),
                // but before dataProcessor.dataFilter was applied (so we can secure widgets' internals).
                editor.on( 'toHtml', function( evt ) {
                        var upcastIterator = createUpcastIterator( widgetsRepo ),
                                toBeWrapped;

                        evt.data.dataValue.forEach( upcastIterator.iterator, CKEDITOR.NODE_ELEMENT, true );

                        // Clean up and wrap all queued elements.
                        while ( ( toBeWrapped = upcastIterator.toBeWrapped.pop() ) ) {
                                cleanUpWidgetElement( toBeWrapped[ 0 ] );
                                widgetsRepo.wrapElement( toBeWrapped[ 0 ], toBeWrapped[ 1 ] );
                        }

                        // Used to determine whether only widget was pasted.
                        if ( evt.data.protectedWhitespaces ) {
                                // Whitespaces are protected by wrapping content with spans. Take the middle node only.
                                processedWidgetOnly = evt.data.dataValue.children.length == 3 &&
                                        Widget.isParserWidgetWrapper( evt.data.dataValue.children[ 1 ] );
                        } else {
                                processedWidgetOnly = evt.data.dataValue.children.length == 1 &&
                                        Widget.isParserWidgetWrapper( evt.data.dataValue.children[ 0 ] );
                        }
                }, null, null, 8 );

                editor.on( 'dataReady', function() {
                        // Clean up all widgets loaded from snapshot.
                        if ( snapshotLoaded )
                                cleanUpAllWidgetElements( widgetsRepo, editor.editable() );
                        snapshotLoaded = 0;

                        // Some widgets were destroyed on contentDomUnload,
                        // some on loadSnapshot, but that does not include
                        // e.g. setHtml on inline editor or widgets removed just
                        // before setting data.
                        widgetsRepo.destroyAll( true );
                        widgetsRepo.initOnAll();
                } );

                // Set flag so dataReady will know that additional
                // cleanup is needed, because snapshot containing widgets was loaded.
                editor.on( 'loadSnapshot', function( evt ) {
                        // Primitive but sufficient check which will prevent from executing
                        // heavier cleanUpAllWidgetElements if not needed.
                        if ( ( /data-cke-widget/ ).test( evt.data ) )
                                snapshotLoaded = 1;

                        widgetsRepo.destroyAll( true );
                }, null, null, 9 );

                // Handle pasted single widget.
                editor.on( 'paste', function( evt ) {
                        var data = evt.data;

                        data.dataValue = data.dataValue.replace( pasteReplaceRegex, pasteReplaceFn );

                        // If drag'n'drop kind of paste into nested editable (data.range), selection is set AFTER
                        // data is pasted, which means editor has no chance to change activeFilter's context.
                        // As a result, pasted data is filtered with default editor's filter instead of NE's and
                        // funny things get inserted. Changing the filter by analysis of the paste range below (http://dev.ckeditor.com/ticket/13186).
                        if ( data.range ) {
                                // Check if pasting into nested editable.
                                var nestedEditable = Widget.getNestedEditable( editor.editable(), data.range.startContainer );

                                if ( nestedEditable ) {
                                        // Retrieve the filter from NE's data and set it active before editor.insertHtml is done
                                        // in clipboard plugin.
                                        var filter = CKEDITOR.filter.instances[ nestedEditable.data( 'cke-filter' ) ];

                                        if ( filter ) {
                                                editor.setActiveFilter( filter );
                                        }
                                }
                        }
                } );

                // Listen with high priority to check widgets after data was inserted.
                editor.on( 'afterInsertHtml', function( evt ) {
                        if ( evt.data.intoRange ) {
                                widgetsRepo.checkWidgets( { initOnlyNew: true } );
                        } else {
                                editor.fire( 'lockSnapshot' );
                                // Init only new for performance reason.
                                // Focus inited if only widget was processed.
                                widgetsRepo.checkWidgets( { initOnlyNew: true, focusInited: processedWidgetOnly } );

                                editor.fire( 'unlockSnapshot' );
                        }
                } );
        }

        // Helper for coordinating which widgets should be
        // selected/deselected and which one should be focused/blurred.
        function stateUpdater( widgetsRepo ) {
                var currentlySelected = widgetsRepo.selected,
                        toBeSelected = [],
                        toBeDeselected = currentlySelected.slice( 0 ),
                        focused = null;

                return {
                        select: function( widget ) {
                                if ( CKEDITOR.tools.indexOf( currentlySelected, widget ) < 0 )
                                        toBeSelected.push( widget );

                                var index = CKEDITOR.tools.indexOf( toBeDeselected, widget );
                                if ( index >= 0 )
                                        toBeDeselected.splice( index, 1 );

                                return this;
                        },

                        focus: function( widget ) {
                                focused = widget;
                                return this;
                        },

                        commit: function() {
                                var focusedChanged = widgetsRepo.focused !== focused,
                                        widget, isDirty;

                                widgetsRepo.editor.fire( 'lockSnapshot' );

                                if ( focusedChanged && ( widget = widgetsRepo.focused ) )
                                        blurWidget( widgetsRepo, widget );

                                while ( ( widget = toBeDeselected.pop() ) ) {
                                        currentlySelected.splice( CKEDITOR.tools.indexOf( currentlySelected, widget ), 1 );
                                        // Widget could be destroyed in the meantime - e.g. data could be set.
                                        if ( widget.isInited() ) {
                                                isDirty = widget.editor.checkDirty();

                                                widget.setSelected( false );

                                                !isDirty && widget.editor.resetDirty();
                                        }
                                }

                                if ( focusedChanged && focused ) {
                                        isDirty = widgetsRepo.editor.checkDirty();

                                        widgetsRepo.focused = focused;
                                        widgetsRepo.fire( 'widgetFocused', { widget: focused } );
                                        focused.setFocused( true );

                                        !isDirty && widgetsRepo.editor.resetDirty();
                                }

                                while ( ( widget = toBeSelected.pop() ) ) {
                                        currentlySelected.push( widget );
                                        widget.setSelected( true );
                                }

                                widgetsRepo.editor.fire( 'unlockSnapshot' );
                        }
                };
        }


        //
        // WIDGET helpers ---------------------------------------------------------
        //

        // LEFT, RIGHT, UP, DOWN, DEL, BACKSPACE - unblock default fake sel handlers.
        var keystrokesNotBlockedByWidget = { 37: 1, 38: 1, 39: 1, 40: 1, 8: 1, 46: 1 };

        // Applies or removes style's classes from widget.
        // @param {CKEDITOR.style} style Custom widget style.
        // @param {Boolean} apply Whether to apply or remove style.
        function applyRemoveStyle( widget, style, apply ) {
                var changed = 0,
                        classes = getStyleClasses( style ),
                        updatedClasses = widget.data.classes || {},
                        cl;

                // Ee... Something is wrong with this style.
                if ( !classes )
                        return;

                // Clone, because we need to break reference.
                updatedClasses = CKEDITOR.tools.clone( updatedClasses );

                while ( ( cl = classes.pop() ) ) {
                        if ( apply ) {
                                if ( !updatedClasses[ cl ] )
                                        changed = updatedClasses[ cl ] = 1;
                        } else {
                                if ( updatedClasses[ cl ] ) {
                                        delete updatedClasses[ cl ];
                                        changed = 1;
                                }
                        }
                }
                if ( changed )
                        widget.setData( 'classes', updatedClasses );
        }

        function cancel( evt ) {
                evt.cancel();
        }

        function copySingleWidget( widget, isCut ) {
                var editor = widget.editor,
                        doc = editor.document;

                // We're still handling previous copy/cut.
                // When keystroke is used to copy/cut this will also prevent
                // conflict with copySingleWidget called again for native copy/cut event.
                if ( doc.getById( 'cke_copybin' ) )
                        return;

                        // [IE] Use span for copybin and its container to avoid bug with expanding editable height by
                        // absolutely positioned element.
                var copybinName = ( editor.blockless || CKEDITOR.env.ie ) ? 'span' : 'div',
                        copybin = doc.createElement( copybinName ),
                        copybinContainer = doc.createElement( copybinName ),
                        // IE8 always jumps to the end of document.
                        needsScrollHack = CKEDITOR.env.ie && CKEDITOR.env.version < 9;

                copybinContainer.setAttributes( {
                        id: 'cke_copybin',
                        'data-cke-temp': '1'
                } );

                // Position copybin element outside current viewport.
                copybin.setStyles( {
                        position: 'absolute',
                        width: '1px',
                        height: '1px',
                        overflow: 'hidden'
                } );

                copybin.setStyle( editor.config.contentsLangDirection == 'ltr' ? 'left' : 'right', '-5000px' );

                var range = editor.createRange();
                range.setStartBefore( widget.wrapper );
                range.setEndAfter( widget.wrapper );

                copybin.setHtml(
                        '<span data-cke-copybin-start="1">\u200b</span>' +
                        editor.editable().getHtmlFromRange( range ).getHtml() +
                        '<span data-cke-copybin-end="1">\u200b</span>' );

                // Save snapshot with the current state.
                editor.fire( 'saveSnapshot' );

                // Ignore copybin.
                editor.fire( 'lockSnapshot' );

                copybinContainer.append( copybin );
                editor.editable().append( copybinContainer );

                var listener1 = editor.on( 'selectionChange', cancel, null, null, 0 ),
                        listener2 = widget.repository.on( 'checkSelection', cancel, null, null, 0 );

                if ( needsScrollHack ) {
                        var docElement = doc.getDocumentElement().$,
                                scrollTop = docElement.scrollTop;
                }

                // Once the clone of the widget is inside of copybin, select
                // the entire contents. This selection will be copied by the
                // native browser's clipboard system.
                range = editor.createRange();
                range.selectNodeContents( copybin );
                range.select();

                if ( needsScrollHack )
                        docElement.scrollTop = scrollTop;

                setTimeout( function() {
                        // [IE] Focus widget before removing copybin to avoid scroll jump.
                        if ( !isCut )
                                widget.focus();

                        copybinContainer.remove();

                        listener1.removeListener();
                        listener2.removeListener();

                        editor.fire( 'unlockSnapshot' );

                        if ( isCut ) {
                                widget.repository.del( widget );
                                editor.fire( 'saveSnapshot' );
                        }
                }, 100 ); // Use 100ms, so Chrome (@Mac) will be able to grab the content.
        }

        // Extracts classes array from style instance.
        function getStyleClasses( style ) {
                var attrs = style.getDefinition().attributes,
                        classes = attrs && attrs[ 'class' ];

                return classes ? classes.split( /\s+/ ) : null;
        }

        // [IE] Force keeping focus because IE sometimes forgets to fire focus on main editable
        // when blurring nested editable.
        // @context widget
        function onEditableBlur() {
                var active = CKEDITOR.document.getActive(),
                        editor = this.editor,
                        editable = editor.editable();

                // If focus stays within editor override blur and set currentActive because it should be
                // automatically changed to editable on editable#focus but it is not fired.
                if ( ( editable.isInline() ? editable : editor.document.getWindow().getFrame() ).equals( active ) )
                        editor.focusManager.focus( editable );
        }

        // Force selectionChange when editable was focused.
        // Similar to hack in selection.js#~620.
        // @context widget
        function onEditableFocus() {
                // Gecko does not support 'DOMFocusIn' event on which we unlock selection
                // in selection.js to prevent selection locking when entering nested editables.
                if ( CKEDITOR.env.gecko )
                        this.editor.unlockSelection();

                // We don't need to force selectionCheck on Webkit, because on Webkit
                // we do that on DOMFocusIn in selection.js.
                if ( !CKEDITOR.env.webkit ) {
                        this.editor.forceNextSelectionCheck();
                        this.editor.selectionChange( 1 );
                }
        }

        // Setup listener on widget#data which will update (remove/add) classes
        // by comparing newly set classes with the old ones.
        function setupDataClassesListener( widget ) {
                // Note: previousClasses and newClasses may be null!
                // Tip: for ( cl in null ) is correct.
                var previousClasses = null;

                widget.on( 'data', function() {
                        var newClasses = this.data.classes,
                                cl;

                        // When setting new classes one need to remember
                        // that he must break reference.
                        if ( previousClasses == newClasses )
                                return;

                        for ( cl in previousClasses ) {
                                // Avoid removing and adding classes again.
                                if ( !( newClasses && newClasses[ cl ] ) )
                                        this.removeClass( cl );
                        }
                        for ( cl in newClasses )
                                this.addClass( cl );

                        previousClasses = newClasses;
                } );
        }

        // Add a listener to data event that will set/change widget's label (http://dev.ckeditor.com/ticket/14539).
        function setupA11yListener( widget ) {
                // Note, the function gets executed in a context of widget instance.
                function getLabelDefault() {
                        return this.editor.lang.widget.label.replace( /%1/, this.pathName || this.element.getName() );
                }

                // Setting a listener on data is enough, there's no need to perform it on widget initialization, as
                // setupWidgetData fires this event anyway.
                widget.on( 'data', function() {
                        // In some cases widget might get destroyed in an earlier data listener. For instance, image2 plugin, does
                        // so when changing its internal state.
                        if ( !widget.wrapper ) {
                                return;
                        }

                        var label = this.getLabel ? this.getLabel() : getLabelDefault.call( this );

                        widget.wrapper.setAttribute( 'role', 'region' );
                        widget.wrapper.setAttribute( 'aria-label', label );
                }, null, null, 9999 );
        }

        function setupDragHandler( widget ) {
                if ( !widget.draggable )
                        return;

                var editor = widget.editor,
                        // Use getLast to find wrapper's direct descendant (http://dev.ckeditor.com/ticket/12022).
                        container = widget.wrapper.getLast( Widget.isDomDragHandlerContainer ),
                        img;

                // Reuse drag handler if already exists (http://dev.ckeditor.com/ticket/11281).
                if ( container )
                        img = container.findOne( 'img' );
                else {
                        container = new CKEDITOR.dom.element( 'span', editor.document );
                        container.setAttributes( {
                                'class': 'cke_reset cke_widget_drag_handler_container',
                                // Split background and background-image for IE8 which will break on rgba().
                                style: 'background:rgba(220,220,220,0.5);background-image:url(' + editor.plugins.widget.path + 'images/handle.png)'
                        } );

                        img = new CKEDITOR.dom.element( 'img', editor.document );
                        img.setAttributes( {
                                'class': 'cke_reset cke_widget_drag_handler',
                                'data-cke-widget-drag-handler': '1',
                                src: CKEDITOR.tools.transparentImageData,
                                width: DRAG_HANDLER_SIZE,
                                title: editor.lang.widget.move,
                                height: DRAG_HANDLER_SIZE,
                                role: 'presentation'
                        } );
                        widget.inline && img.setAttribute( 'draggable', 'true' );

                        container.append( img );
                        widget.wrapper.append( container );
                }

                // Preventing page reload when dropped content on widget wrapper (http://dev.ckeditor.com/ticket/13015).
                // Widget is not editable so by default drop on it isn't allowed what means that
                // browser handles it (there's no editable#drop event). If there's no drop event we cannot block
                // the drop, so page is reloaded. This listener enables drop on widget wrappers.
                widget.wrapper.on( 'dragover', function( evt ) {
                        evt.data.preventDefault();
                } );

                widget.wrapper.on( 'mouseenter', widget.updateDragHandlerPosition, widget );
                setTimeout( function() {
                        widget.on( 'data', widget.updateDragHandlerPosition, widget );
                }, 50 );

                if ( !widget.inline ) {
                        img.on( 'mousedown', onBlockWidgetDrag, widget );

                        // On IE8 'dragstart' is propagated to editable, so editor#dragstart is fired twice on block widgets.
                        if ( CKEDITOR.env.ie && CKEDITOR.env.version < 9 ) {
                                img.on( 'dragstart', function( evt ) {
                                        evt.data.preventDefault( true );
                                } );
                        }
                }

                widget.dragHandlerContainer = container;
        }

        function onBlockWidgetDrag( evt ) {
                var finder = this.repository.finder,
                        locator = this.repository.locator,
                        liner = this.repository.liner,
                        editor = this.editor,
                        editable = editor.editable(),
                        listeners = [],
                        sorted = [],
                        locations,
                        y;

                // Mark dragged widget for repository#finder.
                this.repository._.draggedWidget = this;

                // Harvest all possible relations and display some closest.
                var relations = finder.greedySearch(),

                        buffer = CKEDITOR.tools.eventsBuffer( 50, function() {
                                locations = locator.locate( relations );

                                // There's only a single line displayed for D&D.
                                sorted = locator.sort( y, 1 );

                                if ( sorted.length ) {
                                        liner.prepare( relations, locations );
                                        liner.placeLine( sorted[ 0 ] );
                                        liner.cleanup();
                                }
                        } );

                // Let's have the "dragging cursor" over entire editable.
                editable.addClass( 'cke_widget_dragging' );

                // Cache mouse position so it is re-used in events buffer.
                listeners.push( editable.on( 'mousemove', function( evt ) {
                        y = evt.data.$.clientY;
                        buffer.input();
                } ) );

                // Fire drag start as it happens during the native D&D.
                editor.fire( 'dragstart', { target: evt.sender } );

                function onMouseUp() {
                        var l;

                        buffer.reset();

                        // Stop observing events.
                        while ( ( l = listeners.pop() ) )
                                l.removeListener();

                        onBlockWidgetDrop.call( this, sorted, evt.sender );
                }

                // Mouseup means "drop". This is when the widget is being detached
                // from DOM and placed at range determined by the line (location).
                listeners.push( editor.document.once( 'mouseup', onMouseUp, this ) );

                // Prevent calling 'onBlockWidgetDrop' twice in the inline editor.
                // `removeListener` does not work if it is called at the same time event is fired.
                if ( !editable.isInline() ) {
                        // Mouseup may occur when user hovers the line, which belongs to
                        // the outer document. This is, of course, a valid listener too.
                        listeners.push( CKEDITOR.document.once( 'mouseup', onMouseUp, this ) );
                }
        }

        function onBlockWidgetDrop( sorted, dragTarget ) {
                var finder = this.repository.finder,
                        liner = this.repository.liner,
                        editor = this.editor,
                        editable = this.editor.editable();

                if ( !CKEDITOR.tools.isEmpty( liner.visible ) ) {
                        // Retrieve range for the closest location.
                        var dropRange = finder.getRange( sorted[ 0 ] );

                        // Focus widget (it could lost focus after mousedown+mouseup)
                        // and save this state as the one where we want to be taken back when undoing.
                        this.focus();

                        // Drag range will be set in the drop listener.
                        editor.fire( 'drop', {
                                dropRange: dropRange,
                                target: dropRange.startContainer
                        } );
                }

                // Clean-up custom cursor for editable.
                editable.removeClass( 'cke_widget_dragging' );

                // Clean-up all remaining lines.
                liner.hideVisible();

                // Clean-up drag & drop.
                editor.fire( 'dragend', { target: dragTarget } );
        }

        function setupEditables( widget ) {
                var editableName,
                        editableDef,
                        definedEditables = widget.editables;

                widget.editables = {};

                if ( !widget.editables )
                        return;

                for ( editableName in definedEditables ) {
                        editableDef = definedEditables[ editableName ];
                        widget.initEditable( editableName, typeof editableDef == 'string' ? { selector: editableDef } : editableDef );
                }
        }

        function setupMask( widget ) {
                if ( !widget.mask )
                        return;

                // Reuse mask if already exists (http://dev.ckeditor.com/ticket/11281).
                var img = widget.wrapper.findOne( '.cke_widget_mask' );

                if ( !img ) {
                        img = new CKEDITOR.dom.element( 'img', widget.editor.document );
                        img.setAttributes( {
                                src: CKEDITOR.tools.transparentImageData,
                                'class': 'cke_reset cke_widget_mask'
                        } );
                        widget.wrapper.append( img );
                }

                widget.mask = img;
        }

        // Replace parts object containing:
        // partName => selector pairs
        // with:
        // partName => element pairs
        function setupParts( widget ) {
                if ( widget.parts ) {
                        var parts = {},
                                el, partName;

                        for ( partName in widget.parts ) {
                                el = widget.wrapper.findOne( widget.parts[ partName ] );
                                parts[ partName ] = el;
                        }
                        widget.parts = parts;
                }
        }

        function setupWidget( widget, widgetDef ) {
                setupWrapper( widget );
                setupParts( widget );
                setupEditables( widget );
                setupMask( widget );
                setupDragHandler( widget );
                setupDataClassesListener( widget );
                setupA11yListener( widget );

                // http://dev.ckeditor.com/ticket/11145: [IE8] Non-editable content of widget is draggable.
                if ( CKEDITOR.env.ie && CKEDITOR.env.version < 9 ) {
                        widget.wrapper.on( 'dragstart', function( evt ) {
                                var target = evt.data.getTarget();

                                // Allow text dragging inside nested editables or dragging inline widget's drag handler.
                                if ( !Widget.getNestedEditable( widget, target ) && !( widget.inline && Widget.isDomDragHandler( target ) ) )
                                        evt.data.preventDefault();
                        } );
                }

                widget.wrapper.removeClass( 'cke_widget_new' );
                widget.element.addClass( 'cke_widget_element' );

                widget.on( 'key', function( evt ) {
                        var keyCode = evt.data.keyCode;

                        // ENTER.
                        if ( keyCode == 13 ) {
                                widget.edit();
                                // CTRL+C or CTRL+X.
                        } else if ( keyCode == CKEDITOR.CTRL + 67 || keyCode == CKEDITOR.CTRL + 88 ) {
                                copySingleWidget( widget, keyCode == CKEDITOR.CTRL + 88 );
                                return; // Do not preventDefault.
                        } else if ( keyCode in keystrokesNotBlockedByWidget || ( CKEDITOR.CTRL & keyCode ) || ( CKEDITOR.ALT & keyCode ) ) {
                                // Pass chosen keystrokes to other plugins or default fake sel handlers.
                                // Pass all CTRL/ALT keystrokes.
                                return;
                        }

                        return false;
                }, null, null, 999 );
                // Listen with high priority so it's possible
                // to overwrite this callback.

                widget.on( 'doubleclick', function( evt ) {
                        if ( widget.edit() ) {
                                // We have to cancel event if edit method opens a dialog, otherwise
                                // link plugin may open extra dialog (http://dev.ckeditor.com/ticket/12140).
                                evt.cancel();
                        }
                } );

                if ( widgetDef.data )
                        widget.on( 'data', widgetDef.data );

                if ( widgetDef.edit )
                        widget.on( 'edit', widgetDef.edit );
        }

        function setupWidgetData( widget, startupData ) {
                var widgetDataAttr = widget.element.data( 'cke-widget-data' );

                if ( widgetDataAttr )
                        widget.setData( JSON.parse( decodeURIComponent( widgetDataAttr ) ) );
                if ( startupData )
                        widget.setData( startupData );

                // Populate classes if they are not preset.
                if ( !widget.data.classes )
                        widget.setData( 'classes', widget.getClasses() );

                // Unblock data and...
                widget.dataReady = true;

                // Write data to element because this was blocked when data wasn't ready.
                writeDataToElement( widget );

                // Fire data event first time, because this was blocked when data wasn't ready.
                widget.fire( 'data', widget.data );
        }

        function setupWrapper( widget ) {
                // Retrieve widget wrapper. Assign an id to it.
                var wrapper = widget.wrapper = widget.element.getParent();
                wrapper.setAttribute( 'data-cke-widget-id', widget.id );
        }

        function writeDataToElement( widget ) {
                widget.element.data( 'cke-widget-data', encodeURIComponent( JSON.stringify( widget.data ) ) );
        }

        //
        // WIDGET STYLE HANDLER ---------------------------------------------------
        //

        ( function() {
                // Styles categorized by group. It is used to prevent applying styles for the same group being used together.
                var styleGroups = {};

                /**
                 * The class representing a widget style. It is an {@link CKEDITOR#STYLE_OBJECT object} like
                 * the styles handler for widgets.
                 *
                 * **Note:** This custom style handler does not support all methods of the {@link CKEDITOR.style} class.
                 * Not supported methods: {@link #applyToRange}, {@link #removeFromRange}, {@link #applyToObject}.
                 *
                 * @since 4.4
                 * @class CKEDITOR.style.customHandlers.widget
                 * @extends CKEDITOR.style
                 */
                CKEDITOR.style.addCustomHandler( {
                        type: 'widget',

                        setup: function( styleDefinition ) {
                                /**
                                 * The name of widget to which this style can be applied.
                                 * It is extracted from style definition's `widget` property.
                                 *
                                 * @property {String} widget
                                 */
                                this.widget = styleDefinition.widget;

                                /**
                                 * An array of groups that this style belongs to.
                                 * Styles assigned to the same group cannot be combined.
                                 *
                                 * @since 4.6.2
                                 * @property {Array} group
                                 */
                                this.group = typeof styleDefinition.group == 'string' ? [ styleDefinition.group ] : styleDefinition.group;

                                // Store style categorized by its group.
                                // It is used to prevent enabling two styles from same group.
                                if ( this.group ) {
                                        saveStyleGroup( this );
                                }
                        },

                        apply: function( editor ) {
                                var widget;

                                // Before CKEditor 4.4 wasn't a required argument, so we need to
                                // handle a case when it wasn't provided.
                                if ( !( editor instanceof CKEDITOR.editor ) )
                                        return;

                                // Theoretically we could bypass checkApplicable, get widget from
                                // widgets.focused and check its name, what would be faster, but then
                                // this custom style would work differently than the default style
                                // which checks if it's applicable before applying or removing itself.
                                if ( this.checkApplicable( editor.elementPath(), editor ) ) {
                                        widget = editor.widgets.focused;

                                        // Remove other styles from the same group.
                                        if ( this.group ) {
                                                this.removeStylesFromSameGroup( editor );
                                        }

                                        widget.applyStyle( this );
                                }
                        },

                        remove: function( editor ) {
                                // Before CKEditor 4.4 wasn't a required argument, so we need to
                                // handle a case when it wasn't provided.
                                if ( !( editor instanceof CKEDITOR.editor ) )
                                        return;

                                if ( this.checkApplicable( editor.elementPath(), editor ) )
                                        editor.widgets.focused.removeStyle( this );
                        },

                        /**
                         * Removes all styles that belong to the same group as this style. This method will neither add nor remove
                         * the current style.
                         * Returns `true` if any style was removed, otherwise returns `false`.
                         *
                         * @since 4.6.2
                         * @param {CKEDITOR.editor} editor
                         * @returns {Boolean}
                         */
                        removeStylesFromSameGroup: function( editor ) {
                                var stylesFromSameGroup,
                                        path,
                                        removed = false;

                                // Before CKEditor 4.4 wasn't a required argument, so we need to
                                // handle a case when it wasn't provided.
                                if ( !( editor instanceof CKEDITOR.editor ) )
                                        return false;

                                path = editor.elementPath();
                                if ( this.checkApplicable( path, editor ) ) {
                                        // Iterate over each group.
                                        for ( var i = 0, l = this.group.length; i < l; i++ ) {
                                                stylesFromSameGroup = styleGroups[ this.widget ][ this.group[ i ] ];
                                                // Iterate over each style from group.
                                                for ( var j = 0; j < stylesFromSameGroup.length; j++ ) {
                                                        if ( stylesFromSameGroup[ j ] !== this && stylesFromSameGroup[ j ].checkActive( path, editor ) ) {
                                                                editor.widgets.focused.removeStyle( stylesFromSameGroup[ j ] );
                                                                removed = true;
                                                        }
                                                }
                                        }
                                }

                                return removed;
                        },

                        checkActive: function( elementPath, editor ) {
                                return this.checkElementMatch( elementPath.lastElement, 0, editor );
                        },

                        checkApplicable: function( elementPath, editor ) {
                                // Before CKEditor 4.4 wasn't a required argument, so we need to
                                // handle a case when it wasn't provided.
                                if ( !( editor instanceof CKEDITOR.editor ) )
                                        return false;

                                return this.checkElement( elementPath.lastElement );
                        },

                        checkElementMatch: checkElementMatch,

                        checkElementRemovable: checkElementMatch,

                        /**
                         * Checks if an element is a {@link CKEDITOR.plugins.widget#wrapper wrapper} of a
                         * widget whose name matches the {@link #widget widget name} specified in the style definition.
                         *
                         * @param {CKEDITOR.dom.element} element
                         * @returns {Boolean}
                         */
                        checkElement: function( element ) {
                                if ( !Widget.isDomWidgetWrapper( element ) )
                                        return false;

                                var widgetElement = element.getFirst( Widget.isDomWidgetElement );
                                return widgetElement && widgetElement.data( 'widget' ) == this.widget;
                        },

                        buildPreview: function( label ) {
                                return label || this._.definition.name;
                        },

                        /**
                         * Returns allowed content rules which should be registered for this style.
                         * Uses widget's {@link CKEDITOR.plugins.widget.definition#styleableElements} to make a rule
                         * allowing classes on specified elements or use widget's
                         * {@link CKEDITOR.plugins.widget.definition#styleToAllowedContentRules} method to transform a style
                         * into allowed content rules.
                         *
                         * @param {CKEDITOR.editor} The editor instance.
                         * @returns {CKEDITOR.filter.allowedContentRules}
                         */
                        toAllowedContentRules: function( editor ) {
                                if ( !editor )
                                        return null;

                                var widgetDef = editor.widgets.registered[ this.widget ],
                                        classes,
                                        rule = {};

                                if ( !widgetDef )
                                        return null;

                                if ( widgetDef.styleableElements ) {
                                        classes = this.getClassesArray();
                                        if ( !classes )
                                                return null;

                                        rule[ widgetDef.styleableElements ] = {
                                                classes: classes,
                                                propertiesOnly: true
                                        };
                                        return rule;
                                }
                                if ( widgetDef.styleToAllowedContentRules )
                                        return widgetDef.styleToAllowedContentRules( this );
                                return null;
                        },

                        /**
                         * Returns classes defined in the style in form of an array.
                         *
                         * @returns {String[]}
                         */
                        getClassesArray: function() {
                                var classes = this._.definition.attributes && this._.definition.attributes[ 'class' ];

                                return classes ? CKEDITOR.tools.trim( classes ).split( /\s+/ ) : null;
                        },

                        /**
                         * Not implemented.
                         *
                         * @method applyToRange
                         */
                        applyToRange: notImplemented,

                        /**
                         * Not implemented.
                         *
                         * @method removeFromRange
                         */
                        removeFromRange: notImplemented,

                        /**
                         * Not implemented.
                         *
                         * @method applyToObject
                         */
                        applyToObject: notImplemented
                } );

                function notImplemented() {}

                // @context style
                function checkElementMatch( element, fullMatch, editor ) {
                        // Before CKEditor 4.4 wasn't a required argument, so we need to
                        // handle a case when it wasn't provided.
                        if ( !editor )
                                return false;

                        if ( !this.checkElement( element ) )
                                return false;

                        var widget = editor.widgets.getByElement( element, true );
                        return widget && widget.checkStyleActive( this );
                }

                // Save and categorize style by its group.
                function saveStyleGroup( style ) {
                        var widgetName = style.widget,
                                group;

                        if ( !styleGroups[ widgetName ] ) {
                                styleGroups[ widgetName ] = {};
                        }

                        for ( var i = 0, l = style.group.length; i < l; i++ ) {
                                group = style.group[ i ];
                                if ( !styleGroups[ widgetName ][ group ] ) {
                                        styleGroups[ widgetName ][ group ] = [];
                                }

                                styleGroups[ widgetName ][ group ].push( style );
                        }
                }

        } )();

        //
        // EXPOSE PUBLIC API ------------------------------------------------------
        //

        CKEDITOR.plugins.widget = Widget;
        Widget.repository = Repository;
        Widget.nestedEditable = NestedEditable;
} )();

/**
 * An event fired when a widget definition is registered by the {@link CKEDITOR.plugins.widget.repository#add} method.
 * It is possible to modify the definition being registered.
 *
 * @event widgetDefinition
 * @member CKEDITOR.editor
 * @param {CKEDITOR.plugins.widget.definition} data Widget definition.
 */

/**
 * This is an abstract class that describes the definition of a widget.
 * It is a type of {@link CKEDITOR.plugins.widget.repository#add} method's second argument.
 *
 * Widget instances inherit from registered widget definitions, although not in a prototypal way.
 * They are simply extended with corresponding widget definitions. Note that not all properties of
 * the widget definition become properties of a widget. Some, like {@link #data} or {@link #edit}, become
 * widget's events listeners.
 *
 * @class CKEDITOR.plugins.widget.definition
 * @abstract
 * @mixins CKEDITOR.feature
 */

/**
 * Widget definition name. It is automatically set when the definition is
 * {@link CKEDITOR.plugins.widget.repository#add registered}.
 *
 * @property {String} name
 */

/**
 * The method executed while initializing a widget, after a widget instance
 * is created, but before it is ready. It is executed before the first
 * {@link CKEDITOR.plugins.widget#event-data} is fired so it is common to
 * use the `init` method to populate widget data with information loaded from
 * the DOM, like for exmaple:
 *
 *              init: function() {
 *                      this.setData( 'width', this.element.getStyle( 'width' ) );
 *
 *                      if ( this.parts.caption.getStyle( 'display' ) != 'none' )
 *                              this.setData( 'showCaption', true );
 *              }
 *
 * @property {Function} init
 */

/**
 * The function to be used to upcast an element to this widget or a
 * comma-separated list of upcast methods from the {@link #upcasts} object.
 *
 * The upcast function **is not** executed in the widget context (because the widget
 * does not exist yet) and two arguments are passed:
 *
 * * `element` ({@link CKEDITOR.htmlParser.element}) &ndash; The element to be checked.
 * * `data` (`Object`) &ndash; The object which can be extended with data which will then be passed to the widget.
 *
 * An element will be upcasted if a function returned `true` or an instance of
 * a {@link CKEDITOR.htmlParser.element} if upcasting meant DOM structure changes
 * (in this case the widget will be initialized on the returned element).
 *
 * @property {String/Function} upcast
 */

/**
 * The object containing functions which can be used to upcast this widget.
 * Only those pointed by the {@link #upcast} property will be used.
 *
 * In most cases it is appropriate to use {@link #upcast} directly,
 * because majority of widgets need just one method.
 * However, in some cases the widget author may want to expose more than one variant
 * and then this property may be used.
 *
 *              upcasts: {
 *                      // This function may upcast only figure elements.
 *                      figure: function() {
 *                              // ...
 *                      },
 *                      // This function may upcast only image elements.
 *                      image: function() {
 *                              // ...
 *                      },
 *                      // More variants...
 *              }
 *
 *              // Then, widget user may choose which upcast methods will be enabled.
 *              editor.on( 'widgetDefinition', function( evt ) {
 *                      if ( evt.data.name == 'image' )
 *                              evt.data.upcast = 'figure,image'; // Use both methods.
 *              } );
 *
 * @property {Object} upcasts
 */

/**
 * The {@link #upcast} method(s) priority. The upcast with a lower priority number will be called before
 * the one with a higher number. The default priority is `10`.
 *
 * @since 4.5
 * @property {Number} [upcastPriority=10]
 */

/**
 * The function to be used to downcast this widget or
 * a name of the downcast option from the {@link #downcasts} object.
 *
 * The downcast funciton will be executed in the {@link CKEDITOR.plugins.widget} context
 * and with `widgetElement` ({@link CKEDITOR.htmlParser.element}) argument which is
 * the widget's main element.
 *
 * The function may return an instance of the {@link CKEDITOR.htmlParser.node} class if the widget
 * needs to be downcasted to a different node than the widget's main element.
 *
 * @property {String/Function} downcast
 */

/**
 * The object containing functions which can be used to downcast this widget.
 * Only the one pointed by the {@link #downcast} property will be used.
 *
 * In most cases it is appropriate to use {@link #downcast} directly,
 * because majority of widgets have just one variant of downcasting (or none at all).
 * However, in some cases the widget author may want to expose more than one variant
 * and then this property may be used.
 *
 *              downcasts: {
 *                      // This downcast may transform the widget into the figure element.
 *                      figure: function() {
 *                              // ...
 *                      },
 *                      // This downcast may transform the widget into the image element with data-* attributes.
 *                      image: function() {
 *                              // ...
 *                      }
 *              }
 *
 *              // Then, the widget user may choose one of the downcast options when setting up his editor.
 *              editor.on( 'widgetDefinition', function( evt ) {
 *                      if ( evt.data.name == 'image' )
 *                              evt.data.downcast = 'figure';
 *              } );
 *
 * @property downcasts
 */

/**
 * If set, it will be added as the {@link CKEDITOR.plugins.widget#event-edit} event listener.
 * This means that it will be executed when a widget is being edited.
 * See the {@link CKEDITOR.plugins.widget#method-edit} method.
 *
 * @property {Function} edit
 */

/**
 * If set, it will be added as the {@link CKEDITOR.plugins.widget#event-data} event listener.
 * This means that it will be executed every time the {@link CKEDITOR.plugins.widget#property-data widget data} changes.
 *
 * @property {Function} data
 */

/**
 * The method to be executed when the widget's command is executed in order to insert a new widget
 * (widget of this type is not focused). If not defined, then the default action will be
 * performed which means that:
 *
 * * An instance of the widget will be created in a detached {@link CKEDITOR.dom.documentFragment document fragment},
 * * The {@link CKEDITOR.plugins.widget#method-edit} method will be called to trigger widget editing,
 * * The widget element will be inserted into DOM.
 *
 * @property {Function} insert
 */

/**
 * The name of a dialog window which will be opened on {@link CKEDITOR.plugins.widget#method-edit}.
 * If not defined, then the {@link CKEDITOR.plugins.widget#method-edit} method will not perform any action and
 * widget's command will insert a new widget without opening a dialog window first.
 *
 * @property {String} dialog
 */

/**
 * The template which will be used to create a new widget element (when the widget's command is executed).
 * This string is populated with {@link #defaults default values} by using the {@link CKEDITOR.template} format.
 * Therefore it has to be a valid {@link CKEDITOR.template} argument.
 *
 * @property {String} template
 */

/**
 * The data object which will be used to populate the data of a newly created widget.
 * See {@link CKEDITOR.plugins.widget#property-data}.
 *
 *              defaults: {
 *                      showCaption: true,
 *                      align: 'none'
 *              }
 *
 * @property defaults
 */

/**
 * An object containing definitions of widget components (part name => CSS selector).
 *
 *              parts: {
 *                      image: 'img',
 *                      caption: 'div.caption'
 *              }
 *
 * @property parts
 */

/**
 * An object containing definitions of nested editables (editable name => {@link CKEDITOR.plugins.widget.nestedEditable.definition}).
 * Note that editables *have to* be defined in the same order as they are in DOM / {@link CKEDITOR.plugins.widget.definition#template template}.
 * Otherwise errors will occur when nesting widgets inside each other.
 *
 *              editables: {
 *                      header: 'h1',
 *                      content: {
 *                              selector: 'div.content',
 *                              allowedContent: 'p strong em; a[!href]'
 *                      }
 *              }
 *
 * @property editables
 */

/**
 * The function used to obtain an accessibility label for the widget. It might be used to make
 * the widget labels as precise as possible, since it has access to the widget instance.
 *
 * If not specified, the default implementation will use the {@link #pathName} or the main
 * {@link CKEDITOR.plugins.widget#element element} tag name.
 *
 * @property {Function} getLabel
 */

/**
 * The widget name displayed in the elements path.
 *
 * @property {String} pathName
 */

/**
 * If set to `true`, the widget's element will be covered with a transparent mask.
 * This will prevent its content from being clickable, which matters in case
 * of special elements like embedded Flash or iframes that generate a separate "context".
 *
 * @property {Boolean} mask
 */

/**
 * If set to `true/false`, it will force the widget to be either an inline or a block widget.
 * If not set, the widget type will be determined from the widget element.
 *
 * Widget type influences whether a block (`div`) or an inline (`span`) element is used
 * for the wrapper.
 *
 * @property {Boolean} inline
 */

/**
 * The label for the widget toolbar button.
 *
 *              editor.widgets.add( 'simplebox', {
 *                      button: 'Create a simple box'
 *              } );
 *
 *              editor.widgets.add( 'simplebox', {
 *                      button: editor.lang.simplebox.title
 *              } );
 *
 * @property {String} button
 */

/**
 * Whether widget should be draggable. Defaults to `true`.
 * If set to `false` drag handler will not be displayed when hovering widget.
 *
 * @property {Boolean} draggable
 */

/**
 * Names of element(s) (separated by spaces) for which the {@link CKEDITOR.filter} should allow classes
 * defined in the widget styles. For example if your widget is upcasted from a simple `<div>`
 * element, then in order to make it styleable you can set:
 *
 *              editor.widgets.add( 'customWidget', {
 *                      upcast: function( element ) {
 *                              return element.name == 'div';
 *                      },
 *
 *                      // ...
 *
 *                      styleableElements: 'div'
 *              } );
 *
 * Then, when the following style is defined:
 *
 *              {
 *                      name: 'Thick border', type: 'widget', widget: 'customWidget',
 *                      attributes: { 'class': 'thickBorder' }
 *              }
 *
 * a rule allowing the `thickBorder` class for `div` elements will be registered in the {@link CKEDITOR.filter}.
 *
 * If you need to have more freedom when transforming widget style to allowed content rules,
 * you can use the {@link #styleToAllowedContentRules} callback.
 *
 * @since 4.4
 * @property {String} styleableElements
 */

/**
 * Function transforming custom widget's {@link CKEDITOR.style} instance into
 * {@link CKEDITOR.filter.allowedContentRules}. It may be used when a static
 * {@link #styleableElements} property is not enough to inform the {@link CKEDITOR.filter}
 * what HTML features should be enabled when allowing the given style.
 *
 * In most cases, when style's classes just have to be added to element name(s) used by
 * the widget element, it is recommended to use simpler {@link #styleableElements} property.
 *
 * In order to get parsed classes from the style definition you can use
 * {@link CKEDITOR.style.customHandlers.widget#getClassesArray}.
 *
 * For example, if you want to use the [object format of allowed content rules](#!/guide/dev_allowed_content_rules-section-object-format),
 * to specify `match` validator, your implementation could look like this:
 *
 *              editor.widgets.add( 'customWidget', {
 *                      // ...
 *
 *                      styleToAllowedContentRules: funciton( style ) {
 *                              // Retrieve classes defined in the style.
 *                              var classes = style.getClassesArray();
 *
 *                              // Do something crazy - for example return allowed content rules in object format,
 *                              // with custom match property and propertiesOnly flag.
 *                              return {
 *                                      h1: {
 *                                              match: isWidgetElement,
 *                                              propertiesOnly: true,
 *                                              classes: classes
 *                                      }
 *                              };
 *                      }
 *              } );
 *
 * @since 4.4
 * @property {Function} styleToAllowedContentRules
 * @param {CKEDITOR.style.customHandlers.widget} style The style to be transformed.
 * @returns {CKEDITOR.filter.allowedContentRules}
 */

/**
 * This is an abstract class that describes the definition of a widget's nested editable.
 * It is a type of values in the {@link CKEDITOR.plugins.widget.definition#editables} object.
 *
 * In the simplest case the definition is a string which is a CSS selector used to
 * find an element that will become a nested editable inside the widget. Note that
 * the widget element can be a nested editable, too.
 *
 * In the more advanced case a definition is an object with a required `selector` property.
 *
 *              editables: {
 *                      header: 'h1',
 *                      content: {
 *                              selector: 'div.content',
 *                              allowedContent: 'p strong em; a[!href]'
 *                      }
 *              }
 *
 * @class CKEDITOR.plugins.widget.nestedEditable.definition
 * @abstract
 */

/**
 * The CSS selector used to find an element which will become a nested editable.
 *
 * @property {String} selector
 */

/**
 * The [Advanced Content Filter](#!/guide/dev_advanced_content_filter) rules
 * which will be used to limit the content allowed in this nested editable.
 * This option is similar to {@link CKEDITOR.config#allowedContent} and one can
 * use it to limit the editor features available in the nested editable.
 *
 * If no `allowedContent` is specified, the editable will use the editor default
 * {@link CKEDITOR.editor#filter}.
 *
 * @property {CKEDITOR.filter.allowedContentRules} allowedContent
 */

/**
 * The [Advanced Content Filter](#!/guide/dev_advanced_content_filter) rules
 * which will be used to blacklist elements within this nested editable.
 * This option is similar to {@link CKEDITOR.config#disallowedContent}.
 *
 * Note that `disallowedContent` work on top of the definition's {@link #allowedContent}.
 *
 * @since 4.7.3
 * @property {CKEDITOR.filter.disallowedContentRules} disallowedContent
 */

/**
 * Nested editable name displayed in the elements path.
 *
 * @property {String} pathName
 */