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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/* global DOMParser */\n\n/**\n * @module widget/widgettypearound\n */\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport Template from '@ckeditor/ckeditor5-ui/src/template';\nimport Enter from '@ckeditor/ckeditor5-enter/src/enter';\nimport Delete from '@ckeditor/ckeditor5-typing/src/delete';\nimport {\n\tisForwardArrowKeyCode,\n\tkeyCodes\n} from '@ckeditor/ckeditor5-utils/src/keyboard';\n\nimport {\n\tisTypeAroundWidget,\n\tgetClosestTypeAroundDomButton,\n\tgetTypeAroundButtonPosition,\n\tgetClosestWidgetViewElement,\n\tgetTypeAroundFakeCaretPosition,\n\tTYPE_AROUND_SELECTION_ATTRIBUTE\n} from './utils';\n\nimport {\n\tisNonTypingKeystroke\n} from '@ckeditor/ckeditor5-typing/src/utils/injectunsafekeystrokeshandling';\n\nimport { isWidget } from '../utils';\n\nimport returnIcon from '../../theme/icons/return-arrow.svg';\nimport '../../theme/widgettypearound.css';\n\nconst POSSIBLE_INSERTION_POSITIONS = [ 'before', 'after' ];\n\n// Do the SVG parsing once and then clone the result <svg> DOM element for each new button.\nconst RETURN_ARROW_ICON_ELEMENT = new DOMParser().parseFromString( returnIcon, 'image/svg+xml' ).firstChild;\n\nconst PLUGIN_DISABLED_EDITING_ROOT_CLASS = 'ck-widget__type-around_disabled';\n\n/**\n * A plugin that allows users to type around widgets where normally it is impossible to place the caret due\n * to limitations of web browsers. These \"tight spots\" occur, for instance, before (or after) a widget being\n * the first (or last) child of its parent or between two block widgets.\n *\n * This plugin extends the {@link module:widget/widget~Widget `Widget`} plugin and injects the user interface\n * with two buttons into each widget instance in the editor. Each of the buttons can be clicked by the\n * user if the widget is next to the \"tight spot\". Once clicked, a paragraph is created with the selection anchored\n * in it so that users can type (or insert content, paste, etc.) straight away.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class WidgetTypeAround extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get pluginName() {\n\t\treturn 'WidgetTypeAround';\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get requires() {\n\t\treturn [ Enter, Delete ];\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tconstructor( editor ) {\n\t\tsuper( editor );\n\n\t\t/**\n\t\t * A reference to the model widget element that has the fake caret active\n\t\t * on either side of it. It is later used to remove CSS classes associated with the fake caret\n\t\t * when the widget no longer needs it.\n\t\t *\n\t\t * @private\n\t\t * @member {module:engine/model/element~Element|null}\n\t\t */\n\t\tthis._currentFakeCaretModelElement = null;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tinit() {\n\t\tconst editor = this.editor;\n\t\tconst editingView = editor.editing.view;\n\n\t\t// Set a CSS class on the view editing root when the plugin is disabled so all the buttons\n\t\t// and lines visually disappear. All the interactions are disabled in individual plugin methods.\n\t\tthis.on( 'change:isEnabled', ( evt, data, isEnabled ) => {\n\t\t\teditingView.change( writer => {\n\t\t\t\tfor ( const root of editingView.document.roots ) {\n\t\t\t\t\tif ( isEnabled ) {\n\t\t\t\t\t\twriter.removeClass( PLUGIN_DISABLED_EDITING_ROOT_CLASS, root );\n\t\t\t\t\t} else {\n\t\t\t\t\t\twriter.addClass( PLUGIN_DISABLED_EDITING_ROOT_CLASS, root );\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t} );\n\n\t\t\tif ( !isEnabled ) {\n\t\t\t\teditor.model.change( writer => {\n\t\t\t\t\twriter.removeSelectionAttribute( TYPE_AROUND_SELECTION_ATTRIBUTE );\n\t\t\t\t} );\n\t\t\t}\n\t\t} );\n\n\t\tthis._enableTypeAroundUIInjection();\n\t\tthis._enableInsertingParagraphsOnButtonClick();\n\t\tthis._enableInsertingParagraphsOnEnterKeypress();\n\t\tthis._enableInsertingParagraphsOnTypingKeystroke();\n\t\tthis._enableTypeAroundFakeCaretActivationUsingKeyboardArrows();\n\t\tthis._enableDeleteIntegration();\n\t\tthis._enableInsertContentIntegration();\n\t\tthis._enableDeleteContentIntegration();\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tdestroy() {\n\t\tthis._currentFakeCaretModelElement = null;\n\t}\n\n\t/**\n\t * Inserts a new paragraph next to a widget element with the selection anchored in it.\n\t *\n\t * **Note**: This method is heavily user-oriented and will both focus the editing view and scroll\n\t * the viewport to the selection in the inserted paragraph.\n\t *\n\t * @protected\n\t * @param {module:engine/model/element~Element} widgetModelElement The model widget element next to which a paragraph is inserted.\n\t * @param {'before'|'after'} position The position where the paragraph is inserted. Either `'before'` or `'after'` the widget.\n\t */\n\t_insertParagraph( widgetModelElement, position ) {\n\t\tconst editor = this.editor;\n\t\tconst editingView = editor.editing.view;\n\n\t\teditor.execute( 'insertParagraph', {\n\t\t\tposition: editor.model.createPositionAt( widgetModelElement, position )\n\t\t} );\n\n\t\teditingView.focus();\n\t\teditingView.scrollToTheSelection();\n\t}\n\n\t/**\n\t * A wrapper for the {@link module:utils/emittermixin~EmitterMixin#listenTo} method that executes the callbacks only\n\t * when the plugin {@link #isEnabled is enabled}.\n\t *\n\t * @private\n\t * @param {module:utils/emittermixin~Emitter} emitter The object that fires the event.\n\t * @param {String} event The name of the event.\n\t * @param {Function} callback The function to be called on event.\n\t * @param {Object} [options={}] Additional options.\n\t * @param {module:utils/priorities~PriorityString|Number} [options.priority='normal'] The priority of this event callback. The higher\n\t * the priority value the sooner the callback will be fired. Events having the same priority are called in the\n\t * order they were added.\n\t */\n\t_listenToIfEnabled( emitter, event, callback, options ) {\n\t\tthis.listenTo( emitter, event, ( ...args ) => {\n\t\t\t// Do not respond if the plugin is disabled.\n\t\t\tif ( this.isEnabled ) {\n\t\t\t\tcallback( ...args );\n\t\t\t}\n\t\t}, options );\n\t}\n\n\t/**\n\t * Similar to {@link #_insertParagraph}, this method inserts a paragraph except that it\n\t * does not expect a position. Instead, it performs the insertion next to a selected widget\n\t * according to the `widget-type-around` model selection attribute value (fake caret position).\n\t *\n\t * Because this method requires the `widget-type-around` attribute to be set,\n\t * the insertion can only happen when the widget's fake caret is active (e.g. activated\n\t * using the keyboard).\n\t *\n\t * @private\n\t * @returns {Boolean} Returns `true` when the paragraph was inserted (the attribute was present) and `false` otherwise.\n\t */\n\t_insertParagraphAccordingToFakeCaretPosition() {\n\t\tconst editor = this.editor;\n\t\tconst model = editor.model;\n\t\tconst modelSelection = model.document.selection;\n\t\tconst typeAroundFakeCaretPosition = getTypeAroundFakeCaretPosition( modelSelection );\n\n\t\tif ( !typeAroundFakeCaretPosition ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tconst selectedModelElement = modelSelection.getSelectedElement();\n\n\t\tthis._insertParagraph( selectedModelElement, typeAroundFakeCaretPosition );\n\n\t\treturn true;\n\t}\n\n\t/**\n\t * Creates a listener in the editing conversion pipeline that injects the widget type around\n\t * UI into every single widget instance created in the editor.\n\t *\n\t * The UI is delivered as a {@link module:engine/view/uielement~UIElement}\n\t * wrapper which renders DOM buttons that users can use to insert paragraphs.\n\t *\n\t * @private\n\t */\n\t_enableTypeAroundUIInjection() {\n\t\tconst editor = this.editor;\n\t\tconst schema = editor.model.schema;\n\t\tconst t = editor.locale.t;\n\t\tconst buttonTitles = {\n\t\t\tbefore: t( 'Insert paragraph before block' ),\n\t\t\tafter: t( 'Insert paragraph after block' )\n\t\t};\n\n\t\teditor.editing.downcastDispatcher.on( 'insert', ( evt, data, conversionApi ) => {\n\t\t\tconst viewElement = conversionApi.mapper.toViewElement( data.item );\n\n\t\t\t// Filter out non-widgets and inline widgets.\n\t\t\tif ( isTypeAroundWidget( viewElement, data.item, schema ) ) {\n\t\t\t\tinjectUIIntoWidget( conversionApi.writer, buttonTitles, viewElement );\n\t\t\t}\n\t\t}, { priority: 'low' } );\n\t}\n\n\t/**\n\t * Brings support for the fake caret that appears when either:\n\t *\n\t * * the selection moves to a widget from a position next to it using arrow keys,\n\t * * the arrow key is pressed when the widget is already selected.\n\t *\n\t * The fake caret lets the user know that they can start typing or just press\n\t * <kbd>Enter</kbd> to insert a paragraph at the position next to a widget as suggested by the fake caret.\n\t *\n\t * The fake caret disappears when the user changes the selection or the editor\n\t * gets blurred.\n\t *\n\t * The whole idea is as follows:\n\t *\n\t * 1. A user does one of the 2 scenarios described at the beginning.\n\t * 2. The \"keydown\" listener is executed and the decision is made whether to show or hide the fake caret.\n\t * 3. If it should show up, the `widget-type-around` model selection attribute is set indicating\n\t *    on which side of the widget it should appear.\n\t * 4. The selection dispatcher reacts to the selection attribute and sets CSS classes responsible for the\n\t *    fake caret on the view widget.\n\t * 5. If the fake caret should disappear, the selection attribute is removed and the dispatcher\n\t *    does the CSS class clean-up in the view.\n\t * 6. Additionally, `change:range` and `FocusTracker#isFocused` listeners also remove the selection\n\t *    attribute (the former also removes widget CSS classes).\n\t *\n\t * @private\n\t */\n\t_enableTypeAroundFakeCaretActivationUsingKeyboardArrows() {\n\t\tconst editor = this.editor;\n\t\tconst model = editor.model;\n\t\tconst modelSelection = model.document.selection;\n\t\tconst schema = model.schema;\n\t\tconst editingView = editor.editing.view;\n\n\t\t// This is the main listener responsible for the fake caret.\n\t\t// Note: The priority must precede the default Widget class keydown handler (\"high\").\n\t\tthis._listenToIfEnabled( editingView.document, 'arrowKey', ( evt, domEventData ) => {\n\t\t\tthis._handleArrowKeyPress( evt, domEventData );\n\t\t}, { context: [ isWidget, '$text' ], priority: 'high' } );\n\n\t\t// This listener makes sure the widget type around selection attribute will be gone from the model\n\t\t// selection as soon as the model range changes. This attribute only makes sense when a widget is selected\n\t\t// (and the \"fake horizontal caret\" is visible) so whenever the range changes (e.g. selection moved somewhere else),\n\t\t// let's get rid of the attribute so that the selection downcast dispatcher isn't even bothered.\n\t\tthis._listenToIfEnabled( modelSelection, 'change:range', ( evt, data ) => {\n\t\t\t// Do not reset the selection attribute when the change was indirect.\n\t\t\tif ( !data.directChange ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\t// Get rid of the widget type around attribute of the selection on every change:range.\n\t\t\t// If the range changes, it means for sure, the user is no longer in the active (\"fake horizontal caret\") mode.\n\t\t\teditor.model.change( writer => {\n\t\t\t\twriter.removeSelectionAttribute( TYPE_AROUND_SELECTION_ATTRIBUTE );\n\t\t\t} );\n\t\t} );\n\n\t\t// Get rid of the widget type around attribute of the selection on every document change\n\t\t// that makes widget not selected any more (i.e. widget was removed).\n\t\tthis._listenToIfEnabled( model.document, 'change:data', () => {\n\t\t\tconst selectedModelElement = modelSelection.getSelectedElement();\n\n\t\t\tif ( selectedModelElement ) {\n\t\t\t\tconst selectedViewElement = editor.editing.mapper.toViewElement( selectedModelElement );\n\n\t\t\t\tif ( isTypeAroundWidget( selectedViewElement, selectedModelElement, schema ) ) {\n\t\t\t\t\treturn;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\teditor.model.change( writer => {\n\t\t\t\twriter.removeSelectionAttribute( TYPE_AROUND_SELECTION_ATTRIBUTE );\n\t\t\t} );\n\t\t} );\n\n\t\t// React to changes of the model selection attribute made by the arrow keys listener.\n\t\t// If the block widget is selected and the attribute changes, downcast the attribute to special\n\t\t// CSS classes associated with the active (\"fake horizontal caret\") mode of the widget.\n\t\tthis._listenToIfEnabled( editor.editing.downcastDispatcher, 'selection', ( evt, data, conversionApi ) => {\n\t\t\tconst writer = conversionApi.writer;\n\n\t\t\tif ( this._currentFakeCaretModelElement ) {\n\t\t\t\tconst selectedViewElement = conversionApi.mapper.toViewElement( this._currentFakeCaretModelElement );\n\n\t\t\t\tif ( selectedViewElement ) {\n\t\t\t\t\t// Get rid of CSS classes associated with the active (\"fake horizontal caret\") mode from the view widget.\n\t\t\t\t\twriter.removeClass( POSSIBLE_INSERTION_POSITIONS.map( positionToWidgetCssClass ), selectedViewElement );\n\n\t\t\t\t\tthis._currentFakeCaretModelElement = null;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tconst selectedModelElement = data.selection.getSelectedElement();\n\n\t\t\tif ( !selectedModelElement ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tconst selectedViewElement = conversionApi.mapper.toViewElement( selectedModelElement );\n\n\t\t\tif ( !isTypeAroundWidget( selectedViewElement, selectedModelElement, schema ) ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tconst typeAroundFakeCaretPosition = getTypeAroundFakeCaretPosition( data.selection );\n\n\t\t\tif ( !typeAroundFakeCaretPosition ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\twriter.addClass( positionToWidgetCssClass( typeAroundFakeCaretPosition ), selectedViewElement );\n\n\t\t\t// Remember the view widget that got the \"fake-caret\" CSS class. This class should be removed ASAP when the\n\t\t\t// selection changes\n\t\t\tthis._currentFakeCaretModelElement = selectedModelElement;\n\t\t} );\n\n\t\tthis._listenToIfEnabled( editor.ui.focusTracker, 'change:isFocused', ( evt, name, isFocused ) => {\n\t\t\tif ( !isFocused ) {\n\t\t\t\teditor.model.change( writer => {\n\t\t\t\t\twriter.removeSelectionAttribute( TYPE_AROUND_SELECTION_ATTRIBUTE );\n\t\t\t\t} );\n\t\t\t}\n\t\t} );\n\n\t\tfunction positionToWidgetCssClass( position ) {\n\t\t\treturn `ck-widget_type-around_show-fake-caret_${ position }`;\n\t\t}\n\t}\n\n\t/**\n\t * A listener executed on each \"keydown\" in the view document, a part of\n\t * {@link #_enableTypeAroundFakeCaretActivationUsingKeyboardArrows}.\n\t *\n\t * It decides whether the arrow keypress should activate the fake caret or not (also whether it should\n\t * be deactivated).\n\t *\n\t * The fake caret activation is done by setting the `widget-type-around` model selection attribute\n\t * in this listener, and stopping and preventing the event that would normally be handled by the widget\n\t * plugin that is responsible for the regular keyboard navigation near/across all widgets (that\n\t * includes inline widgets, which are ignored by the widget type around plugin).\n\t *\n\t * @private\n\t */\n\t_handleArrowKeyPress( evt, domEventData ) {\n\t\tconst editor = this.editor;\n\t\tconst model = editor.model;\n\t\tconst modelSelection = model.document.selection;\n\t\tconst schema = model.schema;\n\t\tconst editingView = editor.editing.view;\n\n\t\tconst keyCode = domEventData.keyCode;\n\t\tconst isForward = isForwardArrowKeyCode( keyCode, editor.locale.contentLanguageDirection );\n\t\tconst selectedViewElement = editingView.document.selection.getSelectedElement();\n\t\tconst selectedModelElement = editor.editing.mapper.toModelElement( selectedViewElement );\n\t\tlet shouldStopAndPreventDefault;\n\n\t\t// Handle keyboard navigation when a type-around-compatible widget is currently selected.\n\t\tif ( isTypeAroundWidget( selectedViewElement, selectedModelElement, schema ) ) {\n\t\t\tshouldStopAndPreventDefault = this._handleArrowKeyPressOnSelectedWidget( isForward );\n\t\t}\n\t\t// Handle keyboard arrow navigation when the selection is next to a type-around-compatible widget\n\t\t// and the widget is about to be selected.\n\t\telse if ( modelSelection.isCollapsed ) {\n\t\t\tshouldStopAndPreventDefault = this._handleArrowKeyPressWhenSelectionNextToAWidget( isForward );\n\t\t}\n\n\t\tif ( shouldStopAndPreventDefault ) {\n\t\t\tdomEventData.preventDefault();\n\t\t\tevt.stop();\n\t\t}\n\t}\n\n\t/**\n\t * Handles the keyboard navigation on \"keydown\" when a widget is currently selected and activates or deactivates\n\t * the fake caret for that widget, depending on the current value of the `widget-type-around` model\n\t * selection attribute and the direction of the pressed arrow key.\n\t *\n\t * @private\n\t * @param {Boolean} isForward `true` when the pressed arrow key was responsible for the forward model selection movement\n\t * as in {@link module:utils/keyboard~isForwardArrowKeyCode}.\n\t * @returns {Boolean} Returns `true` when the keypress was handled and no other keydown listener of the editor should\n\t * process the event any further. Returns `false` otherwise.\n\t */\n\t_handleArrowKeyPressOnSelectedWidget( isForward ) {\n\t\tconst editor = this.editor;\n\t\tconst model = editor.model;\n\t\tconst modelSelection = model.document.selection;\n\t\tconst typeAroundFakeCaretPosition = getTypeAroundFakeCaretPosition( modelSelection );\n\n\t\treturn model.change( writer => {\n\t\t\t// If the fake caret is displayed...\n\t\t\tif ( typeAroundFakeCaretPosition ) {\n\t\t\t\tconst isLeavingWidget = typeAroundFakeCaretPosition === ( isForward ? 'after' : 'before' );\n\n\t\t\t\t// If the keyboard arrow works against the value of the selection attribute...\n\t\t\t\t// then remove the selection attribute but prevent default DOM actions\n\t\t\t\t// and do not let the Widget plugin listener move the selection. This brings\n\t\t\t\t// the widget back to the state, for instance, like if was selected using the mouse.\n\t\t\t\t//\n\t\t\t\t// **Note**: If leaving the widget when the fake caret is active, then the default\n\t\t\t\t// Widget handler will change the selection and, in turn, this will automatically discard\n\t\t\t\t// the selection attribute.\n\t\t\t\tif ( !isLeavingWidget ) {\n\t\t\t\t\twriter.removeSelectionAttribute( TYPE_AROUND_SELECTION_ATTRIBUTE );\n\n\t\t\t\t\treturn true;\n\t\t\t\t}\n\t\t\t}\n\t\t\t// If the fake caret wasn't displayed, let's set it now according to the direction of the arrow\n\t\t\t// key press. This also means we cannot let the Widget plugin listener move the selection.\n\t\t\telse {\n\t\t\t\twriter.setSelectionAttribute( TYPE_AROUND_SELECTION_ATTRIBUTE, isForward ? 'after' : 'before' );\n\n\t\t\t\treturn true;\n\t\t\t}\n\n\t\t\treturn false;\n\t\t} );\n\t}\n\n\t/**\n\t * Handles the keyboard navigation on \"keydown\" when **no** widget is selected but the selection is **directly** next\n\t * to one and upon the fake caret should become active for this widget upon arrow keypress\n\t * (AKA entering/selecting the widget).\n\t *\n\t * **Note**: This code mirrors the implementation from the widget plugin but also adds the selection attribute.\n\t * Unfortunately, there is no safe way to let the widget plugin do the selection part first and then just set the\n\t * selection attribute here in the widget type around plugin. This is why this code must duplicate some from the widget plugin.\n\t *\n\t * @private\n\t * @param {Boolean} isForward `true` when the pressed arrow key was responsible for the forward model selection movement\n\t * as in {@link module:utils/keyboard~isForwardArrowKeyCode}.\n\t * @returns {Boolean} Returns `true` when the keypress was handled and no other keydown listener of the editor should\n\t * process the event any further. Returns `false` otherwise.\n\t */\n\t_handleArrowKeyPressWhenSelectionNextToAWidget( isForward ) {\n\t\tconst editor = this.editor;\n\t\tconst model = editor.model;\n\t\tconst schema = model.schema;\n\t\tconst widgetPlugin = editor.plugins.get( 'Widget' );\n\n\t\t// This is the widget the selection is about to be set on.\n\t\tconst modelElementNextToSelection = widgetPlugin._getObjectElementNextToSelection( isForward );\n\t\tconst viewElementNextToSelection = editor.editing.mapper.toViewElement( modelElementNextToSelection );\n\n\t\tif ( isTypeAroundWidget( viewElementNextToSelection, modelElementNextToSelection, schema ) ) {\n\t\t\tmodel.change( writer => {\n\t\t\t\twidgetPlugin._setSelectionOverElement( modelElementNextToSelection );\n\t\t\t\twriter.setSelectionAttribute( TYPE_AROUND_SELECTION_ATTRIBUTE, isForward ? 'before' : 'after' );\n\t\t\t} );\n\n\t\t\t// The change() block above does the same job as the Widget plugin. The event can\n\t\t\t// be safely canceled.\n\t\t\treturn true;\n\t\t}\n\n\t\treturn false;\n\t}\n\n\t/**\n\t * Registers a `mousedown` listener for the view document which intercepts events\n\t * coming from the widget type around UI, which happens when a user clicks one of the buttons\n\t * that insert a paragraph next to a widget.\n\t *\n\t * @private\n\t */\n\t_enableInsertingParagraphsOnButtonClick() {\n\t\tconst editor = this.editor;\n\t\tconst editingView = editor.editing.view;\n\n\t\tthis._listenToIfEnabled( editingView.document, 'mousedown', ( evt, domEventData ) => {\n\t\t\tconst button = getClosestTypeAroundDomButton( domEventData.domTarget );\n\n\t\t\tif ( !button ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tconst buttonPosition = getTypeAroundButtonPosition( button );\n\t\t\tconst widgetViewElement = getClosestWidgetViewElement( button, editingView.domConverter );\n\t\t\tconst widgetModelElement = editor.editing.mapper.toModelElement( widgetViewElement );\n\n\t\t\tthis._insertParagraph( widgetModelElement, buttonPosition );\n\n\t\t\tdomEventData.preventDefault();\n\t\t\tevt.stop();\n\t\t} );\n\t}\n\n\t/**\n\t * Creates the <kbd>Enter</kbd> key listener on the view document that allows the user to insert a paragraph\n\t * near the widget when either:\n\t *\n\t * * The fake caret was first activated using the arrow keys,\n\t * * The entire widget is selected in the model.\n\t *\n\t * In the first case, the new paragraph is inserted according to the `widget-type-around` selection\n\t * attribute (see {@link #_handleArrowKeyPress}).\n\t *\n\t * In the second case, the new paragraph is inserted based on whether a soft (<kbd>Shift</kbd>+<kbd>Enter</kbd>) keystroke\n\t * was pressed or not.\n\t *\n\t * @private\n\t */\n\t_enableInsertingParagraphsOnEnterKeypress() {\n\t\tconst editor = this.editor;\n\t\tconst selection = editor.model.document.selection;\n\t\tconst editingView = editor.editing.view;\n\n\t\tthis._listenToIfEnabled( editingView.document, 'enter', ( evt, domEventData ) => {\n\t\t\t// This event could be triggered from inside the widget but we are interested\n\t\t\t// only when the widget is selected itself.\n\t\t\tif ( evt.eventPhase != 'atTarget' ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tconst selectedModelElement = selection.getSelectedElement();\n\t\t\tconst selectedViewElement = editor.editing.mapper.toViewElement( selectedModelElement );\n\n\t\t\tconst schema = editor.model.schema;\n\t\t\tlet wasHandled;\n\n\t\t\t// First check if the widget is selected and there's a type around selection attribute associated\n\t\t\t// with the fake caret that would tell where to insert a new paragraph.\n\t\t\tif ( this._insertParagraphAccordingToFakeCaretPosition() ) {\n\t\t\t\twasHandled = true;\n\t\t\t}\n\t\t\t// Then, if there is no selection attribute associated with the fake caret, check if the widget\n\t\t\t// simply is selected and create a new paragraph according to the keystroke (Shift+)Enter.\n\t\t\telse if ( isTypeAroundWidget( selectedViewElement, selectedModelElement, schema ) ) {\n\t\t\t\tthis._insertParagraph( selectedModelElement, domEventData.isSoft ? 'before' : 'after' );\n\n\t\t\t\twasHandled = true;\n\t\t\t}\n\n\t\t\tif ( wasHandled ) {\n\t\t\t\tdomEventData.preventDefault();\n\t\t\t\tevt.stop();\n\t\t\t}\n\t\t}, { context: isWidget } );\n\t}\n\n\t/**\n\t * Similar to the {@link #_enableInsertingParagraphsOnEnterKeypress}, it allows the user\n\t * to insert a paragraph next to a widget when the fake caret was activated using arrow\n\t * keys but it responds to typing keystrokes instead of <kbd>Enter</kbd>.\n\t *\n\t * \"Typing keystrokes\" are keystrokes that insert new content into the document,\n\t * for instance, letters (\"a\") or numbers (\"4\"). The \"keydown\" listener enabled by this method\n\t * will insert a new paragraph according to the `widget-type-around` model selection attribute\n\t * as the user simply starts typing, which creates the impression that the fake caret\n\t * behaves like a real one rendered by the browser (AKA your text appears where the caret was).\n\t *\n\t * **Note**: At the moment this listener creates 2 undo steps: one for the `insertParagraph` command\n\t * and another one for actual typing. It is not a disaster but this may need to be fixed\n\t * sooner or later.\n\t *\n\t * Learn more in {@link module:typing/utils/injectunsafekeystrokeshandling}.\n\t *\n\t * @private\n\t */\n\t_enableInsertingParagraphsOnTypingKeystroke() {\n\t\tconst editor = this.editor;\n\t\tconst editingView = editor.editing.view;\n\t\tconst keyCodesHandledSomewhereElse = [\n\t\t\tkeyCodes.enter,\n\t\t\tkeyCodes.delete,\n\t\t\tkeyCodes.backspace\n\t\t];\n\n\t\t// Note: The priority must precede the default observers.\n\t\tthis._listenToIfEnabled( editingView.document, 'keydown', ( evt, domEventData ) => {\n\t\t\t// Don't handle enter/backspace/delete here. They are handled in dedicated listeners.\n\t\t\tif ( !keyCodesHandledSomewhereElse.includes( domEventData.keyCode ) && !isNonTypingKeystroke( domEventData ) ) {\n\t\t\t\tthis._insertParagraphAccordingToFakeCaretPosition();\n\t\t\t}\n\t\t}, { priority: 'high' } );\n\t}\n\n\t/**\n\t * It creates a \"delete\" event listener on the view document to handle cases when the <kbd>Delete</kbd> or <kbd>Backspace</kbd>\n\t * is pressed and the fake caret is currently active.\n\t *\n\t * The fake caret should create an illusion of a real browser caret so that when it appears before or after\n\t * a widget, pressing <kbd>Delete</kbd> or <kbd>Backspace</kbd> should remove a widget or delete the content\n\t * before or after a widget (depending on the content surrounding the widget).\n\t *\n\t * @private\n\t */\n\t_enableDeleteIntegration() {\n\t\tconst editor = this.editor;\n\t\tconst editingView = editor.editing.view;\n\t\tconst model = editor.model;\n\t\tconst schema = model.schema;\n\n\t\tthis._listenToIfEnabled( editingView.document, 'delete', ( evt, domEventData ) => {\n\t\t\t// This event could be triggered from inside the widget but we are interested\n\t\t\t// only when the widget is selected itself.\n\t\t\tif ( evt.eventPhase != 'atTarget' ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tconst typeAroundFakeCaretPosition = getTypeAroundFakeCaretPosition( model.document.selection );\n\n\t\t\t// This listener handles only these cases when the fake caret is active.\n\t\t\tif ( !typeAroundFakeCaretPosition ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tconst direction = domEventData.direction;\n\t\t\tconst selectedModelWidget = model.document.selection.getSelectedElement();\n\n\t\t\tconst isFakeCaretBefore = typeAroundFakeCaretPosition === 'before';\n\t\t\tconst isDeleteForward = direction == 'forward';\n\t\t\tconst shouldDeleteEntireWidget = isFakeCaretBefore === isDeleteForward;\n\n\t\t\tif ( shouldDeleteEntireWidget ) {\n\t\t\t\teditor.execute( 'delete', {\n\t\t\t\t\tselection: model.createSelection( selectedModelWidget, 'on' )\n\t\t\t\t} );\n\t\t\t} else {\n\t\t\t\tconst range = schema.getNearestSelectionRange(\n\t\t\t\t\tmodel.createPositionAt( selectedModelWidget, typeAroundFakeCaretPosition ),\n\t\t\t\t\tdirection\n\t\t\t\t);\n\n\t\t\t\t// If there is somewhere to move selection to, then there will be something to delete.\n\t\t\t\tif ( range ) {\n\t\t\t\t\t// If the range is NOT collapsed, then we know that the range contains an object (see getNearestSelectionRange() docs).\n\t\t\t\t\tif ( !range.isCollapsed ) {\n\t\t\t\t\t\tmodel.change( writer => {\n\t\t\t\t\t\t\twriter.setSelection( range );\n\t\t\t\t\t\t\teditor.execute( isDeleteForward ? 'deleteForward' : 'delete' );\n\t\t\t\t\t\t} );\n\t\t\t\t\t} else {\n\t\t\t\t\t\tconst probe = model.createSelection( range.start );\n\t\t\t\t\t\tmodel.modifySelection( probe, { direction } );\n\n\t\t\t\t\t\t// If the range is collapsed, let's see if a non-collapsed range exists that can could be deleted.\n\t\t\t\t\t\t// If such range exists, use the editor command because it it safe for collaboration (it merges where it can).\n\t\t\t\t\t\tif ( !probe.focus.isEqual( range.start ) ) {\n\t\t\t\t\t\t\tmodel.change( writer => {\n\t\t\t\t\t\t\t\twriter.setSelection( range );\n\t\t\t\t\t\t\t\teditor.execute( isDeleteForward ? 'deleteForward' : 'delete' );\n\t\t\t\t\t\t\t} );\n\t\t\t\t\t\t}\n\t\t\t\t\t\t// If there is no non-collapsed range to be deleted then we are sure that there is an empty element\n\t\t\t\t\t\t// next to a widget that should be removed. \"delete\" and \"deleteForward\" commands cannot get rid of it\n\t\t\t\t\t\t// so calling Model#deleteContent here manually.\n\t\t\t\t\t\telse {\n\t\t\t\t\t\t\tconst deepestEmptyRangeAncestor = getDeepestEmptyElementAncestor( schema, range.start.parent );\n\n\t\t\t\t\t\t\tmodel.deleteContent( model.createSelection( deepestEmptyRangeAncestor, 'on' ), {\n\t\t\t\t\t\t\t\tdoNotAutoparagraph: true\n\t\t\t\t\t\t\t} );\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// If some content was deleted, don't let the handler from the Widget plugin kick in.\n\t\t\t// If nothing was deleted, then the default handler will have nothing to do anyway.\n\t\t\tdomEventData.preventDefault();\n\t\t\tevt.stop();\n\t\t}, { context: isWidget } );\n\t}\n\n\t/**\n\t * Attaches the {@link module:engine/model/model~Model#event:insertContent} event listener that, for instance, allows the user to paste\n\t * content near a widget when the fake caret is first activated using the arrow keys.\n\t *\n\t * The content is inserted according to the `widget-type-around` selection attribute (see {@link #_handleArrowKeyPress}).\n\t *\n\t * @private\n\t */\n\t_enableInsertContentIntegration() {\n\t\tconst editor = this.editor;\n\t\tconst model = this.editor.model;\n\t\tconst documentSelection = model.document.selection;\n\n\t\tthis._listenToIfEnabled( editor.model, 'insertContent', ( evt, [ content, selectable ] ) => {\n\t\t\tif ( selectable && !selectable.is( 'documentSelection' ) ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tconst typeAroundFakeCaretPosition = getTypeAroundFakeCaretPosition( documentSelection );\n\n\t\t\tif ( !typeAroundFakeCaretPosition ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tevt.stop();\n\n\t\t\treturn model.change( writer => {\n\t\t\t\tconst selectedElement = documentSelection.getSelectedElement();\n\t\t\t\tconst position = model.createPositionAt( selectedElement, typeAroundFakeCaretPosition );\n\t\t\t\tconst selection = writer.createSelection( position );\n\n\t\t\t\tconst result = model.insertContent( content, selection );\n\n\t\t\t\twriter.setSelection( selection );\n\n\t\t\t\treturn result;\n\t\t\t} );\n\t\t}, { priority: 'high' } );\n\t}\n\n\t/**\n\t * Attaches the {@link module:engine/model/model~Model#event:deleteContent} event listener to block the event when the fake\n\t * caret is active.\n\t *\n\t * This is required for cases that trigger {@link module:engine/model/model~Model#deleteContent `model.deleteContent()`}\n\t * before calling {@link module:engine/model/model~Model#insertContent `model.insertContent()`} like, for instance,\n\t * plain text pasting.\n\t *\n\t * @private\n\t */\n\t_enableDeleteContentIntegration() {\n\t\tconst editor = this.editor;\n\t\tconst model = this.editor.model;\n\t\tconst documentSelection = model.document.selection;\n\n\t\tthis._listenToIfEnabled( editor.model, 'deleteContent', ( evt, [ selection ] ) => {\n\t\t\tif ( selection && !selection.is( 'documentSelection' ) ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tconst typeAroundFakeCaretPosition = getTypeAroundFakeCaretPosition( documentSelection );\n\n\t\t\t// Disable removing the selection content while pasting plain text.\n\t\t\tif ( typeAroundFakeCaretPosition ) {\n\t\t\t\tevt.stop();\n\t\t\t}\n\t\t}, { priority: 'high' } );\n\t}\n}\n\n// Injects the type around UI into a view widget instance.\n//\n// @param {module:engine/view/downcastwriter~DowncastWriter} viewWriter\n// @param {Object.<String,String>} buttonTitles\n// @param {module:engine/view/element~Element} widgetViewElement\nfunction injectUIIntoWidget( viewWriter, buttonTitles, widgetViewElement ) {\n\tconst typeAroundWrapper = viewWriter.createUIElement( 'div', {\n\t\tclass: 'ck ck-reset_all ck-widget__type-around'\n\t}, function( domDocument ) {\n\t\tconst wrapperDomElement = this.toDomElement( domDocument );\n\n\t\tinjectButtons( wrapperDomElement, buttonTitles );\n\t\tinjectFakeCaret( wrapperDomElement );\n\n\t\treturn wrapperDomElement;\n\t} );\n\n\t// Inject the type around wrapper into the widget's wrapper.\n\tviewWriter.insert( viewWriter.createPositionAt( widgetViewElement, 'end' ), typeAroundWrapper );\n}\n\n// FYI: Not using the IconView class because each instance would need to be destroyed to avoid memory leaks\n// and it's pretty hard to figure out when a view (widget) is gone for good so it's cheaper to use raw\n// <svg> here.\n//\n// @param {HTMLElement} wrapperDomElement\n// @param {Object.<String,String>} buttonTitles\nfunction injectButtons( wrapperDomElement, buttonTitles ) {\n\tfor ( const position of POSSIBLE_INSERTION_POSITIONS ) {\n\t\tconst buttonTemplate = new Template( {\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-widget__type-around__button',\n\t\t\t\t\t`ck-widget__type-around__button_${ position }`\n\t\t\t\t],\n\t\t\t\ttitle: buttonTitles[ position ]\n\t\t\t},\n\t\t\tchildren: [\n\t\t\t\twrapperDomElement.ownerDocument.importNode( RETURN_ARROW_ICON_ELEMENT, true )\n\t\t\t]\n\t\t} );\n\n\t\twrapperDomElement.appendChild( buttonTemplate.render() );\n\t}\n}\n\n// @param {HTMLElement} wrapperDomElement\nfunction injectFakeCaret( wrapperDomElement ) {\n\tconst caretTemplate = new Template( {\n\t\ttag: 'div',\n\t\tattributes: {\n\t\t\tclass: [\n\t\t\t\t'ck',\n\t\t\t\t'ck-widget__type-around__fake-caret'\n\t\t\t]\n\t\t}\n\t} );\n\n\twrapperDomElement.appendChild( caretTemplate.render() );\n}\n\n// Returns the ancestor of an element closest to the root which is empty. For instance,\n// for `<baz>`:\n//\n//\t\t<foo>abc<bar><baz></baz></bar></foo>\n//\n// it returns `<bar>`.\n//\n// @param {module:engine/model/schema~Schema} schema\n// @param {module:engine/model/element~Element} element\n// @returns {module:engine/model/element~Element|null}\nfunction getDeepestEmptyElementAncestor( schema, element ) {\n\tlet deepestEmptyAncestor = element;\n\n\tfor ( const ancestor of element.getAncestors( { parentFirst: true } ) ) {\n\t\tif ( ancestor.childCount > 1 || schema.isLimit( ancestor ) ) {\n\t\t\tbreak;\n\t\t}\n\n\t\tdeepestEmptyAncestor = ancestor;\n\t}\n\n\treturn deepestEmptyAncestor;\n}\n","/**\n * @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/widgettypearound/utils\n */\n\nimport { isWidget } from '../utils';\n\n/**\n * The name of the type around model selection attribute responsible for\n * displaying a fake caret next to a selected widget.\n */\nexport const TYPE_AROUND_SELECTION_ATTRIBUTE = 'widget-type-around';\n\n/**\n * Checks if an element is a widget that qualifies to get the widget type around UI.\n *\n * @param {module:engine/view/element~Element} viewElement\n * @param {module:engine/model/element~Element} modelElement\n * @param {module:engine/model/schema~Schema} schema\n * @returns {Boolean}\n */\nexport function isTypeAroundWidget( viewElement, modelElement, schema ) {\n\treturn viewElement && isWidget( viewElement ) && !schema.isInline( modelElement );\n}\n\n/**\n * For the passed HTML element, this helper finds the closest widget type around button ancestor.\n *\n * @param {HTMLElement} domElement\n * @returns {HTMLElement|null}\n */\nexport function getClosestTypeAroundDomButton( domElement ) {\n\treturn domElement.closest( '.ck-widget__type-around__button' );\n}\n\n/**\n * For the passed widget type around button element, this helper determines at which position\n * the paragraph would be inserted into the content if, for instance, the button was\n * clicked by the user.\n *\n * @param {HTMLElement} domElement\n * @returns {'before'|'after'} The position of the button.\n */\nexport function getTypeAroundButtonPosition( domElement ) {\n\treturn domElement.classList.contains( 'ck-widget__type-around__button_before' ) ? 'before' : 'after';\n}\n\n/**\n * For the passed HTML element, this helper returns the closest view widget ancestor.\n *\n * @param {HTMLElement} domElement\n * @param {module:engine/view/domconverter~DomConverter} domConverter\n * @returns {module:engine/view/element~Element}\n */\nexport function getClosestWidgetViewElement( domElement, domConverter ) {\n\tconst widgetDomElement = domElement.closest( '.ck-widget' );\n\n\treturn domConverter.mapDomToView( widgetDomElement );\n}\n\n/**\n * For the passed selection instance, it returns the position of the fake caret displayed next to a widget.\n *\n * **Note**: If the fake caret is not currently displayed, `null` is returned.\n *\n * @param {module:engine/model/selection~Selection|module:engine/model/documentselection~DocumentSelection} selection\n * @returns {'before'|'after'|null} The position of the fake caret or `null` when none is present.\n */\nexport function getTypeAroundFakeCaretPosition( selection ) {\n\treturn selection.getAttribute( TYPE_AROUND_SELECTION_ATTRIBUTE );\n}\n"],"sourceRoot":""}