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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 widget/widget\n */\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport MouseObserver from '@ckeditor/ckeditor5-engine/src/view/observer/mouseobserver';\nimport WidgetTypeAround from './widgettypearound/widgettypearound';\nimport Delete from '@ckeditor/ckeditor5-typing/src/delete';\nimport { getLabel, isWidget, WIDGET_SELECTED_CLASS_NAME } from './utils';\nimport { isForwardArrowKeyCode } from '@ckeditor/ckeditor5-utils/src/keyboard';\nimport env from '@ckeditor/ckeditor5-utils/src/env';\n\nimport '../theme/widget.css';\nimport verticalNavigationHandler from './verticalnavigation';\n\n/**\n * The widget plugin. It enables base support for widgets.\n *\n * See {@glink api/widget package page} for more details and documentation.\n *\n * This plugin enables multiple behaviors required by widgets:\n *\n * * The model to view selection converter for the editing pipeline (it handles widget custom selection rendering).\n * If a converted selection wraps around a widget element, that selection is marked as\n * {@link module:engine/view/selection~Selection#isFake fake}. Additionally, the `ck-widget_selected` CSS class\n * is added to indicate that widget has been selected.\n * * The mouse and keyboard events handling on and around widget elements.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class Widget extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get pluginName() {\n\t\treturn 'Widget';\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get requires() {\n\t\treturn [ WidgetTypeAround, Delete ];\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tinit() {\n\t\tconst editor = this.editor;\n\t\tconst view = editor.editing.view;\n\t\tconst viewDocument = view.document;\n\n\t\t/**\n\t\t * Holds previously selected widgets.\n\t\t *\n\t\t * @private\n\t\t * @type {Set.<module:engine/view/element~Element>}\n\t\t */\n\t\tthis._previouslySelected = new Set();\n\n\t\t// Model to view selection converter.\n\t\t// Converts selection placed over widget element to fake selection.\n\t\t//\n\t\t// By default, the selection is downcasted by the engine to surround the attribute element, even though its only\n\t\t// child is an inline widget. A similar thing also happens when a collapsed marker is rendered as a UI element\n\t\t// next to an inline widget: the view selection contains both the widget and the marker.\n\t\t//\n\t\t// This prevents creating a correct fake selection when this inline widget is selected. Normalize the selection\n\t\t// in these cases based on the model:\n\t\t//\n\t\t//\t\t[<attributeElement><inlineWidget /></attributeElement>] -> <attributeElement>[<inlineWidget />]</attributeElement>\n\t\t//\t\t[<uiElement></uiElement><inlineWidget />] -> <uiElement></uiElement>[<inlineWidget />]\n\t\t//\n\t\t// Thanks to this:\n\t\t//\n\t\t// * fake selection can be set correctly,\n\t\t// * any logic depending on (View)Selection#getSelectedElement() also works OK.\n\t\t//\n\t\t// See https://github.com/ckeditor/ckeditor5/issues/9524.\n\t\tthis.editor.editing.downcastDispatcher.on( 'selection', ( evt, data, conversionApi ) => {\n\t\t\tconst viewWriter = conversionApi.writer;\n\t\t\tconst modelSelection = data.selection;\n\n\t\t\t// The collapsed selection can't contain any widget.\n\t\t\tif ( modelSelection.isCollapsed ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tconst selectedModelElement = modelSelection.getSelectedElement();\n\n\t\t\tif ( !selectedModelElement ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tconst selectedViewElement = editor.editing.mapper.toViewElement( selectedModelElement );\n\n\t\t\tif ( !isWidget( selectedViewElement ) ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tif ( !conversionApi.consumable.consume( modelSelection, 'selection' ) ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tviewWriter.setSelection( viewWriter.createRangeOn( selectedViewElement ), {\n\t\t\t\tfake: true,\n\t\t\t\tlabel: getLabel( selectedViewElement )\n\t\t\t} );\n\t\t} );\n\n\t\t// Mark all widgets inside the selection with the css class.\n\t\t// This handler is registered at the 'low' priority so it's triggered after the real selection conversion.\n\t\tthis.editor.editing.downcastDispatcher.on( 'selection', ( evt, data, conversionApi ) => {\n\t\t\t// Remove selected class from previously selected widgets.\n\t\t\tthis._clearPreviouslySelectedWidgets( conversionApi.writer );\n\n\t\t\tconst viewWriter = conversionApi.writer;\n\t\t\tconst viewSelection = viewWriter.document.selection;\n\n\t\t\tlet lastMarked = null;\n\n\t\t\tfor ( const range of viewSelection.getRanges() ) {\n\t\t\t\t// Note: There could be multiple selected widgets in a range but no fake selection.\n\t\t\t\t// All of them must be marked as selected, for instance [<widget></widget><widget></widget>]\n\t\t\t\tfor ( const value of range ) {\n\t\t\t\t\tconst node = value.item;\n\n\t\t\t\t\t// Do not mark nested widgets in selected one. See: #57.\n\t\t\t\t\tif ( isWidget( node ) && !isChild( node, lastMarked ) ) {\n\t\t\t\t\t\tviewWriter.addClass( WIDGET_SELECTED_CLASS_NAME, node );\n\n\t\t\t\t\t\tthis._previouslySelected.add( node );\n\t\t\t\t\t\tlastMarked = node;\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t}, { priority: 'low' } );\n\n\t\t// If mouse down is pressed on widget - create selection over whole widget.\n\t\tview.addObserver( MouseObserver );\n\t\tthis.listenTo( viewDocument, 'mousedown', ( ...args ) => this._onMousedown( ...args ) );\n\n\t\t// There are two keydown listeners working on different priorities. This allows other\n\t\t// features such as WidgetTypeAround or TableKeyboard to attach their listeners in between\n\t\t// and customize the behavior even further in different content/selection scenarios.\n\t\t//\n\t\t// * The first listener handles changing the selection on arrow key press\n\t\t// if the widget is selected or if the selection is next to a widget and the widget\n\t\t// should become selected upon the arrow key press.\n\t\t//\n\t\t// * The second (late) listener makes sure the default browser action on arrow key press is\n\t\t// prevented when a widget is selected. This prevents the selection from being moved\n\t\t// from a fake selection container.\n\t\tthis.listenTo( viewDocument, 'arrowKey', ( ...args ) => {\n\t\t\tthis._handleSelectionChangeOnArrowKeyPress( ...args );\n\t\t}, { context: [ isWidget, '$text' ] } );\n\n\t\tthis.listenTo( viewDocument, 'arrowKey', ( ...args ) => {\n\t\t\tthis._preventDefaultOnArrowKeyPress( ...args );\n\t\t}, { context: '$root' } );\n\n\t\tthis.listenTo( viewDocument, 'arrowKey', verticalNavigationHandler( this.editor.editing ), { context: '$text' } );\n\n\t\t// Handle custom delete behaviour.\n\t\tthis.listenTo( viewDocument, 'delete', ( evt, data ) => {\n\t\t\tif ( this._handleDelete( data.direction == 'forward' ) ) {\n\t\t\t\tdata.preventDefault();\n\t\t\t\tevt.stop();\n\t\t\t}\n\t\t}, { context: '$root' } );\n\t}\n\n\t/**\n\t * Handles {@link module:engine/view/document~Document#event:mousedown mousedown} events on widget elements.\n\t *\n\t * @private\n\t * @param {module:utils/eventinfo~EventInfo} eventInfo\n\t * @param {module:engine/view/observer/domeventdata~DomEventData} domEventData\n\t */\n\t_onMousedown( eventInfo, domEventData ) {\n\t\tconst editor = this.editor;\n\t\tconst view = editor.editing.view;\n\t\tconst viewDocument = view.document;\n\t\tlet element = domEventData.target;\n\n\t\t// Do nothing for single or double click inside nested editable.\n\t\tif ( isInsideNestedEditable( element ) ) {\n\t\t\t// But at least triple click inside nested editable causes broken selection in Safari.\n\t\t\t// For such event, we select the entire nested editable element.\n\t\t\t// See: https://github.com/ckeditor/ckeditor5/issues/1463.\n\t\t\tif ( ( env.isSafari || env.isGecko ) && domEventData.domEvent.detail >= 3 ) {\n\t\t\t\tconst mapper = editor.editing.mapper;\n\t\t\t\tconst viewElement = element.is( 'attributeElement' ) ?\n\t\t\t\t\telement.findAncestor( element => !element.is( 'attributeElement' ) ) : element;\n\t\t\t\tconst modelElement = mapper.toModelElement( viewElement );\n\n\t\t\t\tdomEventData.preventDefault();\n\n\t\t\t\tthis.editor.model.change( writer => {\n\t\t\t\t\twriter.setSelection( modelElement, 'in' );\n\t\t\t\t} );\n\t\t\t}\n\n\t\t\treturn;\n\t\t}\n\n\t\t// If target is not a widget element - check if one of the ancestors is.\n\t\tif ( !isWidget( element ) ) {\n\t\t\telement = element.findAncestor( isWidget );\n\n\t\t\tif ( !element ) {\n\t\t\t\treturn;\n\t\t\t}\n\t\t}\n\n\t\t// On Android selection would jump to the first table cell, on other devices\n\t\t// we can't block it (and don't need to) because of drag and drop support.\n\t\tif ( env.isAndroid ) {\n\t\t\tdomEventData.preventDefault();\n\t\t}\n\n\t\t// Focus editor if is not focused already.\n\t\tif ( !viewDocument.isFocused ) {\n\t\t\tview.focus();\n\t\t}\n\n\t\t// Create model selection over widget.\n\t\tconst modelElement = editor.editing.mapper.toModelElement( element );\n\n\t\tthis._setSelectionOverElement( modelElement );\n\t}\n\n\t/**\n\t * Handles {@link module:engine/view/document~Document#event:keydown keydown} events and changes\n\t * the model selection when:\n\t *\n\t * * arrow key is pressed when the widget is selected,\n\t * * the selection is next to a widget and the widget should become selected upon the arrow key press.\n\t *\n\t * See {@link #_preventDefaultOnArrowKeyPress}.\n\t *\n\t * @private\n\t * @param {module:utils/eventinfo~EventInfo} eventInfo\n\t * @param {module:engine/view/observer/domeventdata~DomEventData} domEventData\n\t */\n\t_handleSelectionChangeOnArrowKeyPress( eventInfo, domEventData ) {\n\t\tconst keyCode = domEventData.keyCode;\n\n\t\tconst model = this.editor.model;\n\t\tconst schema = model.schema;\n\t\tconst modelSelection = model.document.selection;\n\t\tconst objectElement = modelSelection.getSelectedElement();\n\t\tconst isForward = isForwardArrowKeyCode( keyCode, this.editor.locale.contentLanguageDirection );\n\n\t\t// If object element is selected.\n\t\tif ( objectElement && schema.isObject( objectElement ) ) {\n\t\t\tconst position = isForward ? modelSelection.getLastPosition() : modelSelection.getFirstPosition();\n\t\t\tconst newRange = schema.getNearestSelectionRange( position, isForward ? 'forward' : 'backward' );\n\n\t\t\tif ( newRange ) {\n\t\t\t\tmodel.change( writer => {\n\t\t\t\t\twriter.setSelection( newRange );\n\t\t\t\t} );\n\n\t\t\t\tdomEventData.preventDefault();\n\t\t\t\teventInfo.stop();\n\t\t\t}\n\n\t\t\treturn;\n\t\t}\n\n\t\t// If selection is next to object element.\n\t\t// Return if not collapsed.\n\t\tif ( !modelSelection.isCollapsed ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst objectElementNextToSelection = this._getObjectElementNextToSelection( isForward );\n\n\t\tif ( objectElementNextToSelection && schema.isObject( objectElementNextToSelection ) ) {\n\t\t\tthis._setSelectionOverElement( objectElementNextToSelection );\n\n\t\t\tdomEventData.preventDefault();\n\t\t\teventInfo.stop();\n\t\t}\n\t}\n\n\t/**\n\t * Handles {@link module:engine/view/document~Document#event:keydown keydown} events and prevents\n\t * the default browser behavior to make sure the fake selection is not being moved from a fake selection\n\t * container.\n\t *\n\t * See {@link #_handleSelectionChangeOnArrowKeyPress}.\n\t *\n\t * @private\n\t * @param {module:utils/eventinfo~EventInfo} eventInfo\n\t * @param {module:engine/view/observer/domeventdata~DomEventData} domEventData\n\t */\n\t_preventDefaultOnArrowKeyPress( eventInfo, domEventData ) {\n\t\tconst model = this.editor.model;\n\t\tconst schema = model.schema;\n\t\tconst objectElement = model.document.selection.getSelectedElement();\n\n\t\t// If object element is selected.\n\t\tif ( objectElement && schema.isObject( objectElement ) ) {\n\t\t\tdomEventData.preventDefault();\n\t\t\teventInfo.stop();\n\t\t}\n\t}\n\n\t/**\n\t * Handles delete keys: backspace and delete.\n\t *\n\t * @private\n\t * @param {Boolean} isForward Set to true if delete was performed in forward direction.\n\t * @returns {Boolean|undefined} Returns `true` if keys were handled correctly.\n\t */\n\t_handleDelete( isForward ) {\n\t\t// Do nothing when the read only mode is enabled.\n\t\tif ( this.editor.isReadOnly ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst modelDocument = this.editor.model.document;\n\t\tconst modelSelection = modelDocument.selection;\n\n\t\t// Do nothing on non-collapsed selection.\n\t\tif ( !modelSelection.isCollapsed ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst objectElement = this._getObjectElementNextToSelection( isForward );\n\n\t\tif ( objectElement ) {\n\t\t\tthis.editor.model.change( writer => {\n\t\t\t\tlet previousNode = modelSelection.anchor.parent;\n\n\t\t\t\t// Remove previous element if empty.\n\t\t\t\twhile ( previousNode.isEmpty ) {\n\t\t\t\t\tconst nodeToRemove = previousNode;\n\t\t\t\t\tpreviousNode = nodeToRemove.parent;\n\n\t\t\t\t\twriter.remove( nodeToRemove );\n\t\t\t\t}\n\n\t\t\t\tthis._setSelectionOverElement( objectElement );\n\t\t\t} );\n\n\t\t\treturn true;\n\t\t}\n\t}\n\n\t/**\n\t * Sets {@link module:engine/model/selection~Selection document's selection} over given element.\n\t *\n\t * @protected\n\t * @param {module:engine/model/element~Element} element\n\t */\n\t_setSelectionOverElement( element ) {\n\t\tthis.editor.model.change( writer => {\n\t\t\twriter.setSelection( writer.createRangeOn( element ) );\n\t\t} );\n\t}\n\n\t/**\n\t * Checks if {@link module:engine/model/element~Element element} placed next to the current\n\t * {@link module:engine/model/selection~Selection model selection} exists and is marked in\n\t * {@link module:engine/model/schema~Schema schema} as `object`.\n\t *\n\t * @protected\n\t * @param {Boolean} forward Direction of checking.\n\t * @returns {module:engine/model/element~Element|null}\n\t */\n\t_getObjectElementNextToSelection( forward ) {\n\t\tconst model = this.editor.model;\n\t\tconst schema = model.schema;\n\t\tconst modelSelection = model.document.selection;\n\n\t\t// Clone current selection to use it as a probe. We must leave default selection as it is so it can return\n\t\t// to its current state after undo.\n\t\tconst probe = model.createSelection( modelSelection );\n\t\tmodel.modifySelection( probe, { direction: forward ? 'forward' : 'backward' } );\n\t\tconst objectElement = forward ? probe.focus.nodeBefore : probe.focus.nodeAfter;\n\n\t\tif ( !!objectElement && schema.isObject( objectElement ) ) {\n\t\t\treturn objectElement;\n\t\t}\n\n\t\treturn null;\n\t}\n\n\t/**\n\t * Removes CSS class from previously selected widgets.\n\t *\n\t * @private\n\t * @param {module:engine/view/downcastwriter~DowncastWriter} writer\n\t */\n\t_clearPreviouslySelectedWidgets( writer ) {\n\t\tfor ( const widget of this._previouslySelected ) {\n\t\t\twriter.removeClass( WIDGET_SELECTED_CLASS_NAME, widget );\n\t\t}\n\n\t\tthis._previouslySelected.clear();\n\t}\n}\n\n// Returns `true` when element is a nested editable or is placed inside one.\n//\n// @param {module:engine/view/element~Element}\n// @returns {Boolean}\nfunction isInsideNestedEditable( element ) {\n\twhile ( element ) {\n\t\tif ( element.is( 'editableElement' ) && !element.is( 'rootElement' ) ) {\n\t\t\treturn true;\n\t\t}\n\n\t\t// Click on nested widget should select it.\n\t\tif ( isWidget( element ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\telement = element.parent;\n\t}\n\n\treturn false;\n}\n\n// Checks whether the specified `element` is a child of the `parent` element.\n//\n// @param {module:engine/view/element~Element} element An element to check.\n// @param {module:engine/view/element~Element|null} parent A parent for the element.\n// @returns {Boolean}\nfunction isChild( element, parent ) {\n\tif ( !parent ) {\n\t\treturn false;\n\t}\n\n\treturn Array.from( element.getAncestors() ).includes( parent );\n}\n"],"sourceRoot":""}