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* @license Copyright (c) 2003-2021, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module ui/panel/balloon/contextualballoon\n */\n\nimport { Plugin } from 'ckeditor5/src/core';\nimport BalloonPanelView from './balloonpanelview';\nimport View from '../../view';\nimport ButtonView from '../../button/buttonview';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport FocusTracker from '@ckeditor/ckeditor5-utils/src/focustracker';\nimport toUnit from '@ckeditor/ckeditor5-utils/src/dom/tounit';\nimport Rect from '@ckeditor/ckeditor5-utils/src/dom/rect';\n\nimport prevIcon from '../../../theme/icons/previous-arrow.svg';\nimport nextIcon from '../../../theme/icons/next-arrow.svg';\n\nimport '../../../theme/components/panel/balloonrotator.css';\nimport '../../../theme/components/panel/fakepanel.css';\n\nconst toPx = toUnit( 'px' );\n\n/**\n * Provides the common contextual balloon for the editor.\n *\n * The role of this plugin is to unify the contextual balloons logic, simplify views management and help\n * avoid the unnecessary complexity of handling multiple {@link module:ui/panel/balloon/balloonpanelview~BalloonPanelView}\n * instances in the editor.\n *\n * This plugin allows for creating single or multiple panel stacks.\n *\n * Each stack may have multiple views, with the one on the top being visible. When the visible view is removed from the stack,\n * the previous view becomes visible.\n *\n * It might be useful to implement nested navigation in a balloon. For instance, a toolbar view may contain a link button.\n * When you click it, a link view (which lets you set the URL) is created and put on top of the toolbar view, so the link panel\n * is displayed. When you finish editing the link and close (remove) the link view, the toolbar view is visible again.\n *\n * However, there are cases when there are multiple independent balloons to be displayed, for instance, if the selection\n * is inside two inline comments at the same time. For such cases, you can create two independent panel stacks.\n * The contextual balloon plugin will create a navigation bar to let the users switch between these panel stacks using the \"Next\"\n * and \"Previous\" buttons.\n *\n * If there are no views in the current stack, the balloon panel will try to switch to the next stack. If there are no\n * panels in any stack, the balloon panel will be hidden.\n *\n * **Note**: To force the balloon panel to show only one view, even if there are other stacks, use the `singleViewMode=true` option\n * when {@link module:ui/panel/balloon/contextualballoon~ContextualBalloon#add adding} a view to a panel.\n *\n * From the implementation point of view, the contextual ballon plugin is reusing a single\n * {@link module:ui/panel/balloon/balloonpanelview~BalloonPanelView} instance to display multiple contextual balloon\n * panels in the editor. It also creates a special {@link module:ui/panel/balloon/contextualballoon~RotatorView rotator view},\n * used to manage multiple panel stacks. Rotator view is a child of the balloon panel view and the parent of the specific\n * view you want to display. If there is more than one panel stack to be displayed, the rotator view will add a\n * navigation bar. If there is only one stack, the rotator view is transparent (it does not add any UI elements).\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class ContextualBalloon extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get pluginName() {\n\t\treturn 'ContextualBalloon';\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tconstructor( editor ) {\n\t\tsuper( editor );\n\n\t\t/**\n\t\t * The {@link module:utils/dom/position~Options#limiter position limiter}\n\t\t * for the {@link #view balloon}, used when no `limiter` has been passed into {@link #add}\n\t\t * or {@link #updatePosition}.\n\t\t *\n\t\t * By default, a function that obtains the farthest DOM\n\t\t * {@link module:engine/view/rooteditableelement~RootEditableElement}\n\t\t * of the {@link module:engine/view/document~Document#selection}.\n\t\t *\n\t\t * @member {module:utils/dom/position~Options#limiter} #positionLimiter\n\t\t */\n\t\tthis.positionLimiter = () => {\n\t\t\tconst view = this.editor.editing.view;\n\t\t\tconst viewDocument = view.document;\n\t\t\tconst editableElement = viewDocument.selection.editableElement;\n\n\t\t\tif ( editableElement ) {\n\t\t\t\treturn view.domConverter.mapViewToDom( editableElement.root );\n\t\t\t}\n\n\t\t\treturn null;\n\t\t};\n\n\t\t/**\n\t\t * The currently visible view or `null` when there are no views in any stack.\n\t\t *\n\t\t * @readonly\n\t\t * @observable\n\t\t * @member {module:ui/view~View|null} #visibleView\n\t\t */\n\t\tthis.set( 'visibleView', null );\n\n\t\t/**\n\t\t * The common balloon panel view.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/panel/balloon/balloonpanelview~BalloonPanelView} #view\n\t\t */\n\t\tthis.view = new BalloonPanelView( editor.locale );\n\t\teditor.ui.view.body.add( this.view );\n\t\teditor.ui.focusTracker.add( this.view.element );\n\n\t\t/**\n\t\t * The map of views and their stacks.\n\t\t *\n\t\t * @private\n\t\t * @type {Map.<module:ui/view~View,Set>}\n\t\t */\n\t\tthis._viewToStack = new Map();\n\n\t\t/**\n\t\t * The map of IDs and stacks.\n\t\t *\n\t\t * @private\n\t\t * @type {Map.<String,Set>}\n\t\t */\n\t\tthis._idToStack = new Map();\n\n\t\t/**\n\t\t * A total number of all stacks in the balloon.\n\t\t *\n\t\t * @private\n\t\t * @readonly\n\t\t * @observable\n\t\t * @member {Number} #_numberOfStacks\n\t\t */\n\t\tthis.set( '_numberOfStacks', 0 );\n\n\t\t/**\n\t\t * A flag that controls the single view mode.\n\t\t *\n\t\t * @private\n\t\t * @readonly\n\t\t * @observable\n\t\t * @member {Boolean} #_singleViewMode\n\t\t */\n\t\tthis.set( '_singleViewMode', false );\n\n\t\t/**\n\t\t * Rotator view embedded in the contextual balloon.\n\t\t * Displays the currently visible view in the balloon and provides navigation for switching stacks.\n\t\t *\n\t\t * @private\n\t\t * @type {module:ui/panel/balloon/contextualballoon~RotatorView}\n\t\t */\n\t\tthis._rotatorView = this._createRotatorView();\n\n\t\t/**\n\t\t * Displays fake panels under the balloon panel view when multiple stacks are added to the balloon.\n\t\t *\n\t\t * @private\n\t\t * @type {module:ui/view~View}\n\t\t */\n\t\tthis._fakePanelsView = this._createFakePanelsView();\n\t}\n\n\t/**\n\t * Returns `true` when the given view is in one of the stacks. Otherwise returns `false`.\n\t *\n\t * @param {module:ui/view~View} view\n\t * @returns {Boolean}\n\t */\n\thasView( view ) {\n\t\treturn Array.from( this._viewToStack.keys() ).includes( view );\n\t}\n\n\t/**\n\t * Adds a new view to the stack and makes it visible if the current stack is visible\n\t * or it is the first view in the balloon.\n\t *\n\t * @param {Object} data The configuration of the view.\n\t * @param {String} [data.stackId='main'] The ID of the stack that the view is added to.\n\t * @param {module:ui/view~View} [data.view] The content of the balloon.\n\t * @param {module:utils/dom/position~Options} [data.position] Positioning options.\n\t * @param {String} [data.balloonClassName] An additional CSS class added to the {@link #view balloon} when visible.\n\t * @param {Boolean} [data.withArrow=true] Whether the {@link #view balloon} should be rendered with an arrow.\n\t * @param {Boolean} [data.singleViewMode=false] Whether the view should be the only visible view even if other stacks were added.\n\t */\n\tadd( data ) {\n\t\tif ( this.hasView( data.view ) ) {\n\t\t\t/**\n\t\t\t * Trying to add configuration of the same view more than once.\n\t\t\t *\n\t\t\t * @error contextualballoon-add-view-exist\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'contextualballoon-add-view-exist',\n\t\t\t\t[ this, data ]\n\t\t\t);\n\t\t}\n\n\t\tconst stackId = data.stackId || 'main';\n\n\t\t// If new stack is added, creates it and show view from this stack.\n\t\tif ( !this._idToStack.has( stackId ) ) {\n\t\t\tthis._idToStack.set( stackId, new Map( [ [ data.view, data ] ] ) );\n\t\t\tthis._viewToStack.set( data.view, this._idToStack.get( stackId ) );\n\t\t\tthis._numberOfStacks = this._idToStack.size;\n\n\t\t\tif ( !this._visibleStack || data.singleViewMode ) {\n\t\t\t\tthis.showStack( stackId );\n\t\t\t}\n\n\t\t\treturn;\n\t\t}\n\n\t\tconst stack = this._idToStack.get( stackId );\n\n\t\tif ( data.singleViewMode ) {\n\t\t\tthis.showStack( stackId );\n\t\t}\n\n\t\t// Add new view to the stack.\n\t\tstack.set( data.view, data );\n\t\tthis._viewToStack.set( data.view, stack );\n\n\t\t// And display it if is added to the currently visible stack.\n\t\tif ( stack === this._visibleStack ) {\n\t\t\tthis._showView( data );\n\t\t}\n\t}\n\n\t/**\n\t * Removes the given view from the stack. If the removed view was visible,\n\t * the view preceding it in the stack will become visible instead.\n\t * When there is no view in the stack, the next stack will be displayed.\n\t * When there are no more stacks, the balloon will hide.\n\t *\n\t * @param {module:ui/view~View} view A view to be removed from the balloon.\n\t */\n\tremove( view ) {\n\t\tif ( !this.hasView( view ) ) {\n\t\t\t/**\n\t\t\t * Trying to remove the configuration of the view not defined in the stack.\n\t\t\t *\n\t\t\t * @error contextualballoon-remove-view-not-exist\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'contextualballoon-remove-view-not-exist',\n\t\t\t\t[ this, view ]\n\t\t\t);\n\t\t}\n\n\t\tconst stack = this._viewToStack.get( view );\n\n\t\tif ( this._singleViewMode && this.visibleView === view ) {\n\t\t\tthis._singleViewMode = false;\n\t\t}\n\n\t\t// When visible view will be removed we need to show a preceding view or next stack\n\t\t// if a view is the only view in the stack.\n\t\tif ( this.visibleView === view ) {\n\t\t\tif ( stack.size === 1 ) {\n\t\t\t\tif ( this._idToStack.size > 1 ) {\n\t\t\t\t\tthis._showNextStack();\n\t\t\t\t} else {\n\t\t\t\t\tthis.view.hide();\n\t\t\t\t\tthis.visibleView = null;\n\t\t\t\t\tthis._rotatorView.hideView();\n\t\t\t\t}\n\t\t\t} else {\n\t\t\t\tthis._showView( Array.from( stack.values() )[ stack.size - 2 ] );\n\t\t\t}\n\t\t}\n\n\t\tif ( stack.size === 1 ) {\n\t\t\tthis._idToStack.delete( this._getStackId( stack ) );\n\t\t\tthis._numberOfStacks = this._idToStack.size;\n\t\t} else {\n\t\t\tstack.delete( view );\n\t\t}\n\n\t\tthis._viewToStack.delete( view );\n\t}\n\n\t/**\n\t * Updates the position of the balloon using the position data of the first visible view in the stack.\n\t * When new position data is given, the position data of the currently visible view will be updated.\n\t *\n\t * @param {module:utils/dom/position~Options} [position] position options.\n\t */\n\tupdatePosition( position ) {\n\t\tif ( position ) {\n\t\t\tthis._visibleStack.get( this.visibleView ).position = position;\n\t\t}\n\n\t\tthis.view.pin( this._getBalloonPosition() );\n\t\tthis._fakePanelsView.updatePosition();\n\t}\n\n\t/**\n\t * Shows the last view from the stack of a given ID.\n\t *\n\t * @param {String} id\n\t */\n\tshowStack( id ) {\n\t\tthis.visibleStack = id;\n\t\tconst stack = this._idToStack.get( id );\n\n\t\tif ( !stack ) {\n\t\t\t/**\n\t\t\t * Trying to show a stack that does not exist.\n\t\t\t *\n\t\t\t * @error contextualballoon-showstack-stack-not-exist\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'contextualballoon-showstack-stack-not-exist',\n\t\t\t\tthis\n\t\t\t);\n\t\t}\n\n\t\tif ( this._visibleStack === stack ) {\n\t\t\treturn;\n\t\t}\n\n\t\tthis._showView( Array.from( stack.values() ).pop() );\n\t}\n\n\t/**\n\t * Returns the stack of the currently visible view.\n\t *\n\t * @private\n\t * @type {Set}\n\t */\n\tget _visibleStack() {\n\t\treturn this._viewToStack.get( this.visibleView );\n\t}\n\n\t/**\n\t * Returns the ID of the given stack.\n\t *\n\t * @private\n\t * @param {Set} stack\n\t * @returns {String}\n\t */\n\t_getStackId( stack ) {\n\t\tconst entry = Array.from( this._idToStack.entries() ).find( entry => entry[ 1 ] === stack );\n\n\t\treturn entry[ 0 ];\n\t}\n\n\t/**\n\t * Shows the last view from the next stack.\n\t *\n\t * @private\n\t */\n\t_showNextStack() {\n\t\tconst stacks = Array.from( this._idToStack.values() );\n\n\t\tlet nextIndex = stacks.indexOf( this._visibleStack ) + 1;\n\n\t\tif ( !stacks[ nextIndex ] ) {\n\t\t\tnextIndex = 0;\n\t\t}\n\n\t\tthis.showStack( this._getStackId( stacks[ nextIndex ] ) );\n\t}\n\n\t/**\n\t * Shows the last view from the previous stack.\n\t *\n\t * @private\n\t */\n\t_showPrevStack() {\n\t\tconst stacks = Array.from( this._idToStack.values() );\n\n\t\tlet nextIndex = stacks.indexOf( this._visibleStack ) - 1;\n\n\t\tif ( !stacks[ nextIndex ] ) {\n\t\t\tnextIndex = stacks.length - 1;\n\t\t}\n\n\t\tthis.showStack( this._getStackId( stacks[ nextIndex ] ) );\n\t}\n\n\t/**\n\t * Creates a rotator view.\n\t *\n\t * @private\n\t * @returns {module:ui/panel/balloon/contextualballoon~RotatorView}\n\t */\n\t_createRotatorView() {\n\t\tconst view = new RotatorView( this.editor.locale );\n\t\tconst t = this.editor.locale.t;\n\n\t\tthis.view.content.add( view );\n\n\t\t// Hide navigation when there is only a one stack & not in single view mode.\n\t\tview.bind( 'isNavigationVisible' ).to( this, '_numberOfStacks', this, '_singleViewMode', ( value, isSingleViewMode ) => {\n\t\t\treturn !isSingleViewMode && value > 1;\n\t\t} );\n\n\t\t// Update balloon position after toggling navigation.\n\t\tview.on( 'change:isNavigationVisible', () => ( this.updatePosition() ), { priority: 'low' } );\n\n\t\t// Update stacks counter value.\n\t\tview.bind( 'counter' ).to( this, 'visibleView', this, '_numberOfStacks', ( visibleView, numberOfStacks ) => {\n\t\t\tif ( numberOfStacks < 2 ) {\n\t\t\t\treturn '';\n\t\t\t}\n\n\t\t\tconst current = Array.from( this._idToStack.values() ).indexOf( this._visibleStack ) + 1;\n\n\t\t\treturn t( '%0 of %1', [ current, numberOfStacks ] );\n\t\t} );\n\n\t\tview.buttonNextView.on( 'execute', () => {\n\t\t\t// When current view has a focus then move focus to the editable before removing it,\n\t\t\t// otherwise editor will lost focus.\n\t\t\tif ( view.focusTracker.isFocused ) {\n\t\t\t\tthis.editor.editing.view.focus();\n\t\t\t}\n\n\t\t\tthis._showNextStack();\n\t\t} );\n\n\t\tview.buttonPrevView.on( 'execute', () => {\n\t\t\t// When current view has a focus then move focus to the editable before removing it,\n\t\t\t// otherwise editor will lost focus.\n\t\t\tif ( view.focusTracker.isFocused ) {\n\t\t\t\tthis.editor.editing.view.focus();\n\t\t\t}\n\n\t\t\tthis._showPrevStack();\n\t\t} );\n\n\t\treturn view;\n\t}\n\n\t/**\n\t * @private\n\t * @returns {module:ui/view~View}\n\t */\n\t_createFakePanelsView() {\n\t\tconst view = new FakePanelsView( this.editor.locale, this.view );\n\n\t\tview.bind( 'numberOfPanels' ).to( this, '_numberOfStacks', this, '_singleViewMode', ( number, isSingleViewMode ) => {\n\t\t\tconst showPanels = !isSingleViewMode && number >= 2;\n\n\t\t\treturn showPanels ? Math.min( number - 1, 2 ) : 0;\n\t\t} );\n\n\t\tview.listenTo( this.view, 'change:top', () => view.updatePosition() );\n\t\tview.listenTo( this.view, 'change:left', () => view.updatePosition() );\n\n\t\tthis.editor.ui.view.body.add( view );\n\n\t\treturn view;\n\t}\n\n\t/**\n\t * Sets the view as the content of the balloon and attaches the balloon using position\n\t * options of the first view.\n\t *\n\t * @private\n\t * @param {Object} data Configuration.\n\t * @param {module:ui/view~View} [data.view] The view to show in the balloon.\n\t * @param {String} [data.balloonClassName=''] Additional class name which will be added to the {@link #view balloon}.\n\t * @param {Boolean} [data.withArrow=true] Whether the {@link #view balloon} should be rendered with an arrow.\n\t */\n\t_showView( { view, balloonClassName = '', withArrow = true, singleViewMode = false } ) {\n\t\tthis.view.class = balloonClassName;\n\t\tthis.view.withArrow = withArrow;\n\n\t\tthis._rotatorView.showView( view );\n\t\tthis.visibleView = view;\n\t\tthis.view.pin( this._getBalloonPosition() );\n\t\tthis._fakePanelsView.updatePosition();\n\n\t\tif ( singleViewMode ) {\n\t\t\tthis._singleViewMode = true;\n\t\t}\n\t}\n\n\t/**\n\t * Returns position options of the last view in the stack.\n\t * This keeps the balloon in the same position when the view is changed.\n\t *\n\t * @private\n\t * @returns {module:utils/dom/position~Options}\n\t */\n\t_getBalloonPosition() {\n\t\tlet position = Array.from( this._visibleStack.values() ).pop().position;\n\n\t\t// Use the default limiter if none has been specified.\n\t\tif ( position && !position.limiter ) {\n\t\t\t// Don't modify the original options object.\n\t\t\tposition = Object.assign( {}, position, {\n\t\t\t\tlimiter: this.positionLimiter\n\t\t\t} );\n\t\t}\n\n\t\treturn position;\n\t}\n}\n\n/**\n * Rotator view is a helper class for the {@link module:ui/panel/balloon/contextualballoon~ContextualBalloon ContextualBalloon}.\n * It is used for displaying the last view from the current stack and providing navigation buttons for switching stacks.\n * See the {@link module:ui/panel/balloon/contextualballoon~ContextualBalloon ContextualBalloon} documentation to learn more.\n *\n * @extends module:ui/view~View\n */\nclass RotatorView extends View {\n\t/**\n\t * @inheritDoc\n\t */\n\tconstructor( locale ) {\n\t\tsuper( locale );\n\n\t\tconst t = locale.t;\n\t\tconst bind = this.bindTemplate;\n\n\t\t/**\n\t\t * Defines whether navigation is visible or not.\n\t\t *\n\t\t * @member {Boolean} #isNavigationVisible\n\t\t */\n\t\tthis.set( 'isNavigationVisible', true );\n\n\t\t/**\n\t\t * Used for checking if a view is focused or not.\n\t\t *\n\t\t * @type {module:utils/focustracker~FocusTracker}\n\t\t */\n\t\tthis.focusTracker = new FocusTracker();\n\n\t\t/**\n\t\t * Navigation button for switching the stack to the previous one.\n\t\t *\n\t\t * @type {module:ui/button/buttonview~ButtonView}\n\t\t */\n\t\tthis.buttonPrevView = this._createButtonView( t( 'Previous' ), prevIcon );\n\n\t\t/**\n\t\t * Navigation button for switching the stack to the next one.\n\t\t *\n\t\t * @type {module:ui/button/buttonview~ButtonView}\n\t\t */\n\t\tthis.buttonNextView = this._createButtonView( t( 'Next' ), nextIcon );\n\n\t\t/**\n\t\t * A collection of the child views that creates the rotator content.\n\t\t *\n\t\t * @readonly\n\t\t * @type {module:ui/viewcollection~ViewCollection}\n\t\t */\n\t\tthis.content = this.createCollection();\n\n\t\tthis.setTemplate( {\n\t\t\ttag: 'div',\n\t\t\tattributes: {\n\t\t\t\tclass: [\n\t\t\t\t\t'ck',\n\t\t\t\t\t'ck-balloon-rotator'\n\t\t\t\t],\n\t\t\t\t'z-index': '-1'\n\t\t\t},\n\t\t\tchildren: [\n\t\t\t\t{\n\t\t\t\t\ttag: 'div',\n\t\t\t\t\tattributes: {\n\t\t\t\t\t\tclass: [\n\t\t\t\t\t\t\t'ck-balloon-rotator__navigation',\n\t\t\t\t\t\t\tbind.to( 'isNavigationVisible', value => value ? '' : 'ck-hidden' )\n\t\t\t\t\t\t]\n\t\t\t\t\t},\n\t\t\t\t\tchildren: [\n\t\t\t\t\t\tthis.buttonPrevView,\n\t\t\t\t\t\t{\n\t\t\t\t\t\t\ttag: 'span',\n\n\t\t\t\t\t\t\tattributes: {\n\t\t\t\t\t\t\t\tclass: [\n\t\t\t\t\t\t\t\t\t'ck-balloon-rotator__counter'\n\t\t\t\t\t\t\t\t]\n\t\t\t\t\t\t\t},\n\n\t\t\t\t\t\t\tchildren: [\n\t\t\t\t\t\t\t\t{\n\t\t\t\t\t\t\t\t\ttext: bind.to( 'counter' )\n\t\t\t\t\t\t\t\t}\n\t\t\t\t\t\t\t]\n\t\t\t\t\t\t},\n\t\t\t\t\t\tthis.buttonNextView\n\t\t\t\t\t]\n\t\t\t\t},\n\t\t\t\t{\n\t\t\t\t\ttag: 'div',\n\t\t\t\t\tattributes: {\n\t\t\t\t\t\tclass: 'ck-balloon-rotator__content'\n\t\t\t\t\t},\n\t\t\t\t\tchildren: this.content\n\t\t\t\t}\n\t\t\t]\n\t\t} );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\trender() {\n\t\tsuper.render();\n\n\t\tthis.focusTracker.add( this.element );\n\t}\n\n\t/**\n\t * Shows a given view.\n\t *\n\t * @param {module:ui/view~View} view The view to show.\n\t */\n\tshowView( view ) {\n\t\tthis.hideView();\n\t\tthis.content.add( view );\n\t}\n\n\t/**\n\t * Hides the currently displayed view.\n\t */\n\thideView() {\n\t\tthis.content.clear();\n\t}\n\n\t/**\n\t * Creates a navigation button view.\n\t *\n\t * @private\n\t * @param {String} label The button label.\n\t * @param {String} icon The button icon.\n\t * @returns {module:ui/button/buttonview~ButtonView}\n\t */\n\t_createButtonView( label, icon ) {\n\t\tconst view = new ButtonView( this.locale );\n\n\t\tview.set( {\n\t\t\tlabel,\n\t\t\ticon,\n\t\t\ttooltip: true\n\t\t} );\n\n\t\treturn view;\n\t}\n}\n\n// Displays additional layers under the balloon when multiple stacks are added to the balloon.\n//\n// @private\n// @extends module:ui/view~View\nclass FakePanelsView extends View {\n\t// @inheritDoc\n\tconstructor( locale, balloonPanelView ) {\n\t\tsuper( locale );\n\n\t\tconst bind = this.bindTemplate;\n\n\t\t// Fake panels top offset.\n\t\t//\n\t\t// @observable\n\t\t// @member {Number} #top\n\t\tthis.set( 'top', 0 );\n\n\t\t// Fake panels left offset.\n\t\t//\n\t\t// @observable\n\t\t// @member {Number} #left\n\t\tthis.set( 'left', 0 );\n\n\t\t// Fake panels height.\n\t\t//\n\t\t// @observable\n\t\t// @member {Number} #height\n\t\tthis.set( 'height', 0 );\n\n\t\t// Fake panels width.\n\t\t//\n\t\t// @observable\n\t\t// @member {Number} #width\n\t\tthis.set( 'width', 0 );\n\n\t\t// Number of rendered fake panels.\n\t\t//\n\t\t// @observable\n\t\t// @member {Number} #numberOfPanels\n\t\tthis.set( 'numberOfPanels', 0 );\n\n\t\t// Collection of the child views which creates fake panel content.\n\t\t//\n\t\t// @readonly\n\t\t// @type {module:ui/viewcollection~ViewCollection}\n\t\tthis.content = this.createCollection();\n\n\t\t// Context.\n\t\t//\n\t\t// @private\n\t\t// @type {module:ui/panel/balloon/balloonpanelview~BalloonPanelView}\n\t\tthis._balloonPanelView = balloonPanelView;\n\n\t\tthis.setTemplate( {\n\t\t\ttag: 'div',\n\t\t\tattributes: {\n\t\t\t\tclass: [\n\t\t\t\t\t'ck-fake-panel',\n\t\t\t\t\tbind.to( 'numberOfPanels', number => number ? '' : 'ck-hidden' )\n\t\t\t\t],\n\t\t\t\tstyle: {\n\t\t\t\t\ttop: bind.to( 'top', toPx ),\n\t\t\t\t\tleft: bind.to( 'left', toPx ),\n\t\t\t\t\twidth: bind.to( 'width', toPx ),\n\t\t\t\t\theight: bind.to( 'height', toPx )\n\t\t\t\t}\n\t\t\t},\n\t\t\tchildren: this.content\n\t\t} );\n\n\t\tthis.on( 'change:numberOfPanels', ( evt, name, next, prev ) => {\n\t\t\tif ( next > prev ) {\n\t\t\t\tthis._addPanels( next - prev );\n\t\t\t} else {\n\t\t\t\tthis._removePanels( prev - next );\n\t\t\t}\n\n\t\t\tthis.updatePosition();\n\t\t} );\n\t}\n\n\t// @private\n\t// @param {Number} number\n\t_addPanels( number ) {\n\t\twhile ( number-- ) {\n\t\t\tconst view = new View();\n\n\t\t\tview.setTemplate( { tag: 'div' } );\n\n\t\t\tthis.content.add( view );\n\t\t\tthis.registerChild( view );\n\t\t}\n\t}\n\n\t// @private\n\t// @param {Number} number\n\t_removePanels( number ) {\n\t\twhile ( number-- ) {\n\t\t\tconst view = this.content.last;\n\n\t\t\tthis.content.remove( view );\n\t\t\tthis.deregisterChild( view );\n\t\t\tview.destroy();\n\t\t}\n\t}\n\n\t// Updates coordinates of fake panels.\n\tupdatePosition() {\n\t\tif ( this.numberOfPanels ) {\n\t\t\tconst { top, left } = this._balloonPanelView;\n\t\t\tconst { width, height } = new Rect( this._balloonPanelView.element );\n\n\t\t\tObject.assign( this, { top, left, width, height } );\n\t\t}\n\t}\n}\n"],"sourceRoot":""}