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- /**
- * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.
- * For licensing, see LICENSE.md.
- */
- /**
- * @module widget/utils
- */
- import HighlightStack from './highlightstack';
- import Position from '@ckeditor/ckeditor5-engine/src/view/position';
- import IconView from '@ckeditor/ckeditor5-ui/src/icon/iconview';
- import dragHandlerIcon from '../theme/icons/drag-handler.svg';
- const widgetSymbol = Symbol( 'isWidget' );
- const labelSymbol = Symbol( 'label' );
- /**
- * CSS class added to each widget element.
- *
- * @const {String}
- */
- export const WIDGET_CLASS_NAME = 'ck-widget';
- /**
- * CSS class added to currently selected widget element.
- *
- * @const {String}
- */
- export const WIDGET_SELECTED_CLASS_NAME = 'ck-widget_selected';
- /**
- * Returns `true` if given {@link module:engine/view/element~Element} is a widget.
- *
- * @param {module:engine/view/element~Element} element
- * @returns {Boolean}
- */
- export function isWidget( element ) {
- return !!element.getCustomProperty( widgetSymbol );
- }
- /**
- * Converts given {@link module:engine/view/element~Element} to widget in following way:
- * * sets `contenteditable` attribute to `"true"`,
- * * adds custom `getFillerOffset` method returning `null`,
- * * adds `ck-widget` CSS class,
- * * adds custom property allowing to recognize widget elements by using {@link ~isWidget},
- * * implements `addHighlight` and `removeHighlight` custom properties to handle view highlight on widgets.
- *
- * @param {module:engine/view/element~Element} element
- * @param {module:engine/view/writer~Writer} writer
- * @param {Object} [options={}]
- * @param {String|Function} [options.label] Element's label provided to {@link ~setLabel} function. It can be passed as
- * a plain string or a function returning a string.
- * @param {Boolean} [options.hasSelectionHandler=false] If `true`, the widget will have a selection handler added.
- * @returns {module:engine/view/element~Element} Returns same element.
- */
- export function toWidget( element, writer, options = {} ) {
- writer.setAttribute( 'contenteditable', 'false', element );
- writer.addClass( WIDGET_CLASS_NAME, element );
- writer.setCustomProperty( widgetSymbol, true, element );
- element.getFillerOffset = getFillerOffset;
- if ( options.label ) {
- setLabel( element, options.label, writer );
- }
- if ( options.hasSelectionHandler ) {
- hasSelectionHandler( element, writer );
- }
- setHighlightHandling(
- element,
- writer,
- ( element, descriptor, writer ) => writer.addClass( normalizeToArray( descriptor.classes ), element ),
- ( element, descriptor, writer ) => writer.removeClass( normalizeToArray( descriptor.classes ), element )
- );
- return element;
- // Normalizes CSS class in descriptor that can be provided in form of an array or a string.
- function normalizeToArray( classes ) {
- return Array.isArray( classes ) ? classes : [ classes ];
- }
- }
- /**
- * Sets highlight handling methods. Uses {@link module:widget/highlightstack~HighlightStack} to
- * properly determine which highlight descriptor should be used at given time.
- *
- * @param {module:engine/view/element~Element} element
- * @param {module:engine/view/writer~Writer} writer
- * @param {Function} add
- * @param {Function} remove
- */
- export function setHighlightHandling( element, writer, add, remove ) {
- const stack = new HighlightStack();
- stack.on( 'change:top', ( evt, data ) => {
- if ( data.oldDescriptor ) {
- remove( element, data.oldDescriptor, data.writer );
- }
- if ( data.newDescriptor ) {
- add( element, data.newDescriptor, data.writer );
- }
- } );
- writer.setCustomProperty( 'addHighlight', ( element, descriptor, writer ) => stack.add( descriptor, writer ), element );
- writer.setCustomProperty( 'removeHighlight', ( element, id, writer ) => stack.remove( id, writer ), element );
- }
- /**
- * Sets label for given element.
- * It can be passed as a plain string or a function returning a string. Function will be called each time label is retrieved by
- * {@link ~getLabel}.
- *
- * @param {module:engine/view/element~Element} element
- * @param {String|Function} labelOrCreator
- * @param {module:engine/view/writer~Writer} writer
- */
- export function setLabel( element, labelOrCreator, writer ) {
- writer.setCustomProperty( labelSymbol, labelOrCreator, element );
- }
- /**
- * Returns label for provided element.
- *
- * @param {module:engine/view/element~Element} element
- * @returns {String}
- */
- export function getLabel( element ) {
- const labelCreator = element.getCustomProperty( labelSymbol );
- if ( !labelCreator ) {
- return '';
- }
- return typeof labelCreator == 'function' ? labelCreator() : labelCreator;
- }
- /**
- * Adds functionality to provided {module:engine/view/editableelement~EditableElement} to act as a widget's editable:
- * * adds `ck-editor__editable` and `ck-editor__nested-editable` CSS classes,
- * * sets `contenteditable` as `true` when {module:engine/view/editableelement~EditableElement#isReadOnly} is `false`
- * otherwise set `false`,
- * * adds `ck-editor__nested-editable_focused` CSS class when editable is focused and removes it when it's blurred.
- *
- * @param {module:engine/view/editableelement~EditableElement} editable
- * @param {module:engine/view/writer~Writer} writer
- * @returns {module:engine/view/editableelement~EditableElement} Returns same element that was provided in `editable` param.
- */
- export function toWidgetEditable( editable, writer ) {
- writer.addClass( [ 'ck-editor__editable', 'ck-editor__nested-editable' ], editable );
- // Set initial contenteditable value.
- writer.setAttribute( 'contenteditable', editable.isReadOnly ? 'false' : 'true', editable );
- // Bind contenteditable property to element#isReadOnly.
- editable.on( 'change:isReadOnly', ( evt, property, is ) => {
- writer.setAttribute( 'contenteditable', is ? 'false' : 'true', editable );
- } );
- editable.on( 'change:isFocused', ( evt, property, is ) => {
- if ( is ) {
- writer.addClass( 'ck-editor__nested-editable_focused', editable );
- } else {
- writer.removeClass( 'ck-editor__nested-editable_focused', editable );
- }
- } );
- return editable;
- }
- // Default filler offset function applied to all widget elements.
- //
- // @returns {null}
- function getFillerOffset() {
- return null;
- }
- // Adds a drag handler to the editable element.
- //
- // @param {module:engine/view/editableelement~EditableElement}
- // @param {module:engine/view/writer~Writer} writer
- function hasSelectionHandler( editable, writer ) {
- const selectionHandler = writer.createUIElement( 'div', { class: 'ck ck-widget__selection-handler' }, function( domDocument ) {
- const domElement = this.toDomElement( domDocument );
- // Use the IconView from the ui library.
- const icon = new IconView();
- icon.set( 'content', dragHandlerIcon );
- // Render the icon view right away to append its #element to the selectionHandler DOM element.
- icon.render();
- domElement.appendChild( icon.element );
- return domElement;
- } );
- // Append the selection handler into the widget wrapper.
- writer.insert( Position.createAt( editable ), selectionHandler );
- writer.addClass( [ 'ck-widget_selectable' ], editable );
- }
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