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- /**
- * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.
- * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
- */
- /* globals Node */
- /**
- * @module engine/view/renderer
- */
- import ViewText from './text';
- import ViewPosition from './position';
- import { INLINE_FILLER, INLINE_FILLER_LENGTH, startsWithFiller, isInlineFiller } from './filler';
- import mix from '@ckeditor/ckeditor5-utils/src/mix';
- import diff from '@ckeditor/ckeditor5-utils/src/diff';
- import insertAt from '@ckeditor/ckeditor5-utils/src/dom/insertat';
- import remove from '@ckeditor/ckeditor5-utils/src/dom/remove';
- import ObservableMixin from '@ckeditor/ckeditor5-utils/src/observablemixin';
- import CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';
- import isText from '@ckeditor/ckeditor5-utils/src/dom/istext';
- import isNode from '@ckeditor/ckeditor5-utils/src/dom/isnode';
- import fastDiff from '@ckeditor/ckeditor5-utils/src/fastdiff';
- import env from '@ckeditor/ckeditor5-utils/src/env';
- /**
- * Renderer is responsible for updating the DOM structure and the DOM selection based on
- * the {@link module:engine/view/renderer~Renderer#markToSync information about updated view nodes}.
- * In other words, it renders the view to the DOM.
- *
- * Its main responsibility is to make only the necessary, minimal changes to the DOM. However, unlike in many
- * virtual DOM implementations, the primary reason for doing minimal changes is not the performance but ensuring
- * that native editing features such as text composition, autocompletion, spell checking, selection's x-index are
- * affected as little as possible.
- *
- * Renderer uses {@link module:engine/view/domconverter~DomConverter} to transform view nodes and positions
- * to and from the DOM.
- */
- export default class Renderer {
- /**
- * Creates a renderer instance.
- *
- * @param {module:engine/view/domconverter~DomConverter} domConverter Converter instance.
- * @param {module:engine/view/documentselection~DocumentSelection} selection View selection.
- */
- constructor( domConverter, selection ) {
- /**
- * Set of DOM Documents instances.
- *
- * @readonly
- * @member {Set.<Document>}
- */
- this.domDocuments = new Set();
- /**
- * Converter instance.
- *
- * @readonly
- * @member {module:engine/view/domconverter~DomConverter}
- */
- this.domConverter = domConverter;
- /**
- * Set of nodes which attributes changed and may need to be rendered.
- *
- * @readonly
- * @member {Set.<module:engine/view/node~Node>}
- */
- this.markedAttributes = new Set();
- /**
- * Set of elements which child lists changed and may need to be rendered.
- *
- * @readonly
- * @member {Set.<module:engine/view/node~Node>}
- */
- this.markedChildren = new Set();
- /**
- * Set of text nodes which text data changed and may need to be rendered.
- *
- * @readonly
- * @member {Set.<module:engine/view/node~Node>}
- */
- this.markedTexts = new Set();
- /**
- * View selection. Renderer updates DOM selection based on the view selection.
- *
- * @readonly
- * @member {module:engine/view/documentselection~DocumentSelection}
- */
- this.selection = selection;
- /**
- * Indicates if the view document is focused and selection can be rendered. Selection will not be rendered if
- * this is set to `false`.
- *
- * @member {Boolean}
- */
- this.isFocused = false;
- /**
- * The text node in which the inline filler was rendered.
- *
- * @private
- * @member {Text}
- */
- this._inlineFiller = null;
- /**
- * DOM element containing fake selection.
- *
- * @private
- * @type {null|HTMLElement}
- */
- this._fakeSelectionContainer = null;
- }
- /**
- * Marks a view node to be updated in the DOM by {@link #render `render()`}.
- *
- * Note that only view nodes whose parents have corresponding DOM elements need to be marked to be synchronized.
- *
- * @see #markedAttributes
- * @see #markedChildren
- * @see #markedTexts
- *
- * @param {module:engine/view/document~ChangeType} type Type of the change.
- * @param {module:engine/view/node~Node} node Node to be marked.
- */
- markToSync( type, node ) {
- if ( type === 'text' ) {
- if ( this.domConverter.mapViewToDom( node.parent ) ) {
- this.markedTexts.add( node );
- }
- } else {
- // If the node has no DOM element it is not rendered yet,
- // its children/attributes do not need to be marked to be sync.
- if ( !this.domConverter.mapViewToDom( node ) ) {
- return;
- }
- if ( type === 'attributes' ) {
- this.markedAttributes.add( node );
- } else if ( type === 'children' ) {
- this.markedChildren.add( node );
- } else {
- /**
- * Unknown type passed to Renderer.markToSync.
- *
- * @error renderer-unknown-type
- */
- throw new CKEditorError( 'view-renderer-unknown-type: Unknown type passed to Renderer.markToSync.', this );
- }
- }
- }
- /**
- * Renders all buffered changes ({@link #markedAttributes}, {@link #markedChildren} and {@link #markedTexts}) and
- * the current view selection (if needed) to the DOM by applying a minimal set of changes to it.
- *
- * Renderer tries not to break the text composition (e.g. IME) and x-index of the selection,
- * so it does as little as it is needed to update the DOM.
- *
- * Renderer also handles {@link module:engine/view/filler fillers}. Especially, it checks if the inline filler is needed
- * at the selection position and adds or removes it. To prevent breaking text composition inline filler will not be
- * removed as long as the selection is in the text node which needed it at first.
- */
- render() {
- let inlineFillerPosition;
- // Refresh mappings.
- for ( const element of this.markedChildren ) {
- this._updateChildrenMappings( element );
- }
- // There was inline filler rendered in the DOM but it's not
- // at the selection position any more, so we can remove it
- // (cause even if it's needed, it must be placed in another location).
- if ( this._inlineFiller && !this._isSelectionInInlineFiller() ) {
- this._removeInlineFiller();
- }
- // If we've got the filler, let's try to guess its position in the view.
- if ( this._inlineFiller ) {
- inlineFillerPosition = this._getInlineFillerPosition();
- }
- // Otherwise, if it's needed, create it at the selection position.
- else if ( this._needsInlineFillerAtSelection() ) {
- inlineFillerPosition = this.selection.getFirstPosition();
- // Do not use `markToSync` so it will be added even if the parent is already added.
- this.markedChildren.add( inlineFillerPosition.parent );
- }
- for ( const element of this.markedAttributes ) {
- this._updateAttrs( element );
- }
- for ( const element of this.markedChildren ) {
- this._updateChildren( element, { inlineFillerPosition } );
- }
- for ( const node of this.markedTexts ) {
- if ( !this.markedChildren.has( node.parent ) && this.domConverter.mapViewToDom( node.parent ) ) {
- this._updateText( node, { inlineFillerPosition } );
- }
- }
- // Check whether the inline filler is required and where it really is in the DOM.
- // At this point in most cases it will be in the DOM, but there are exceptions.
- // For example, if the inline filler was deep in the created DOM structure, it will not be created.
- // Similarly, if it was removed at the beginning of this function and then neither text nor children were updated,
- // it will not be present.
- // Fix those and similar scenarios.
- if ( inlineFillerPosition ) {
- const fillerDomPosition = this.domConverter.viewPositionToDom( inlineFillerPosition );
- const domDocument = fillerDomPosition.parent.ownerDocument;
- if ( !startsWithFiller( fillerDomPosition.parent ) ) {
- // Filler has not been created at filler position. Create it now.
- this._inlineFiller = addInlineFiller( domDocument, fillerDomPosition.parent, fillerDomPosition.offset );
- } else {
- // Filler has been found, save it.
- this._inlineFiller = fillerDomPosition.parent;
- }
- } else {
- // There is no filler needed.
- this._inlineFiller = null;
- }
- this._updateSelection();
- this._updateFocus();
- this.markedTexts.clear();
- this.markedAttributes.clear();
- this.markedChildren.clear();
- }
- /**
- * Updates mappings of view element's children.
- *
- * Children that were replaced in the view structure by similar elements (same tag name) are treated as 'replaced'.
- * This means that their mappings can be updated so the new view elements are mapped to the existing DOM elements.
- * Thanks to that these elements do not need to be re-rendered completely.
- *
- * @private
- * @param {module:engine/view/node~Node} viewElement The view element whose children mappings will be updated.
- */
- _updateChildrenMappings( viewElement ) {
- const domElement = this.domConverter.mapViewToDom( viewElement );
- if ( !domElement ) {
- // If there is no `domElement` it means that it was already removed from DOM and there is no need to process it.
- return;
- }
- const actualDomChildren = this.domConverter.mapViewToDom( viewElement ).childNodes;
- const expectedDomChildren = Array.from(
- this.domConverter.viewChildrenToDom( viewElement, domElement.ownerDocument, { withChildren: false } )
- );
- const diff = this._diffNodeLists( actualDomChildren, expectedDomChildren );
- const actions = this._findReplaceActions( diff, actualDomChildren, expectedDomChildren );
- if ( actions.indexOf( 'replace' ) !== -1 ) {
- const counter = { equal: 0, insert: 0, delete: 0 };
- for ( const action of actions ) {
- if ( action === 'replace' ) {
- const insertIndex = counter.equal + counter.insert;
- const deleteIndex = counter.equal + counter.delete;
- const viewChild = viewElement.getChild( insertIndex );
- // The 'uiElement' is a special one and its children are not stored in a view (#799),
- // so we cannot use it with replacing flow (since it uses view children during rendering
- // which will always result in rendering empty element).
- if ( viewChild && !viewChild.is( 'uiElement' ) ) {
- this._updateElementMappings( viewChild, actualDomChildren[ deleteIndex ] );
- }
- remove( expectedDomChildren[ insertIndex ] );
- counter.equal++;
- } else {
- counter[ action ]++;
- }
- }
- }
- }
- /**
- * Updates mappings of a given view element.
- *
- * @private
- * @param {module:engine/view/node~Node} viewElement The view element whose mappings will be updated.
- * @param {Node} domElement The DOM element representing the given view element.
- */
- _updateElementMappings( viewElement, domElement ) {
- // Remap 'DomConverter' bindings.
- this.domConverter.unbindDomElement( domElement );
- this.domConverter.bindElements( domElement, viewElement );
- // View element may have children which needs to be updated, but are not marked, mark them to update.
- this.markedChildren.add( viewElement );
- // Because we replace new view element mapping with the existing one, the corresponding DOM element
- // will not be rerendered. The new view element may have different attributes than the previous one.
- // Since its corresponding DOM element will not be rerendered, new attributes will not be added
- // to the DOM, so we need to mark it here to make sure its attributes gets updated. See #1427 for more
- // detailed case study.
- // Also there are cases where replaced element is removed from the view structure and then has
- // its attributes changed or removed. In such cases the element will not be present in `markedAttributes`
- // and also may be the same (`element.isSimilar()`) as the reused element not having its attributes updated.
- // To prevent such situations we always mark reused element to have its attributes rerenderd (#1560).
- this.markedAttributes.add( viewElement );
- }
- /**
- * Gets the position of the inline filler based on the current selection.
- * Here, we assume that we know that the filler is needed and
- * {@link #_isSelectionInInlineFiller is at the selection position}, and, since it is needed,
- * it is somewhere at the selection position.
- *
- * Note: The filler position cannot be restored based on the filler's DOM text node, because
- * when this method is called (before rendering), the bindings will often be broken. View-to-DOM
- * bindings are only dependable after rendering.
- *
- * @private
- * @returns {module:engine/view/position~Position}
- */
- _getInlineFillerPosition() {
- const firstPos = this.selection.getFirstPosition();
- if ( firstPos.parent.is( 'text' ) ) {
- return ViewPosition._createBefore( this.selection.getFirstPosition().parent );
- } else {
- return firstPos;
- }
- }
- /**
- * Returns `true` if the selection has not left the inline filler's text node.
- * If it is `true`, it means that the filler had been added for a reason and the selection did not
- * leave the filler's text node. For example, the user can be in the middle of a composition so it should not be touched.
- *
- * @private
- * @returns {Boolean} `true` if the inline filler and selection are in the same place.
- */
- _isSelectionInInlineFiller() {
- if ( this.selection.rangeCount != 1 || !this.selection.isCollapsed ) {
- return false;
- }
- // Note, we can't check if selection's position equals position of the
- // this._inlineFiller node, because of #663. We may not be able to calculate
- // the filler's position in the view at this stage.
- // Instead, we check it the other way – whether selection is anchored in
- // that text node or next to it.
- // Possible options are:
- // "FILLER{}"
- // "FILLERadded-text{}"
- const selectionPosition = this.selection.getFirstPosition();
- const position = this.domConverter.viewPositionToDom( selectionPosition );
- if ( position && isText( position.parent ) && startsWithFiller( position.parent ) ) {
- return true;
- }
- return false;
- }
- /**
- * Removes the inline filler.
- *
- * @private
- */
- _removeInlineFiller() {
- const domFillerNode = this._inlineFiller;
- // Something weird happened and the stored node doesn't contain the filler's text.
- if ( !startsWithFiller( domFillerNode ) ) {
- /**
- * The inline filler node was lost. Most likely, something overwrote the filler text node
- * in the DOM.
- *
- * @error view-renderer-filler-was-lost
- */
- throw new CKEditorError( 'view-renderer-filler-was-lost: The inline filler node was lost.', this );
- }
- if ( isInlineFiller( domFillerNode ) ) {
- domFillerNode.parentNode.removeChild( domFillerNode );
- } else {
- domFillerNode.data = domFillerNode.data.substr( INLINE_FILLER_LENGTH );
- }
- this._inlineFiller = null;
- }
- /**
- * Checks if the inline {@link module:engine/view/filler filler} should be added.
- *
- * @private
- * @returns {Boolean} `true` if the inline filler should be added.
- */
- _needsInlineFillerAtSelection() {
- if ( this.selection.rangeCount != 1 || !this.selection.isCollapsed ) {
- return false;
- }
- const selectionPosition = this.selection.getFirstPosition();
- const selectionParent = selectionPosition.parent;
- const selectionOffset = selectionPosition.offset;
- // If there is no DOM root we do not care about fillers.
- if ( !this.domConverter.mapViewToDom( selectionParent.root ) ) {
- return false;
- }
- if ( !( selectionParent.is( 'element' ) ) ) {
- return false;
- }
- // Prevent adding inline filler inside elements with contenteditable=false.
- // https://github.com/ckeditor/ckeditor5-engine/issues/1170
- if ( !isEditable( selectionParent ) ) {
- return false;
- }
- // We have block filler, we do not need inline one.
- if ( selectionOffset === selectionParent.getFillerOffset() ) {
- return false;
- }
- const nodeBefore = selectionPosition.nodeBefore;
- const nodeAfter = selectionPosition.nodeAfter;
- if ( nodeBefore instanceof ViewText || nodeAfter instanceof ViewText ) {
- return false;
- }
- return true;
- }
- /**
- * Checks if text needs to be updated and possibly updates it.
- *
- * @private
- * @param {module:engine/view/text~Text} viewText View text to update.
- * @param {Object} options
- * @param {module:engine/view/position~Position} options.inlineFillerPosition The position where the inline
- * filler should be rendered.
- */
- _updateText( viewText, options ) {
- const domText = this.domConverter.findCorrespondingDomText( viewText );
- const newDomText = this.domConverter.viewToDom( viewText, domText.ownerDocument );
- const actualText = domText.data;
- let expectedText = newDomText.data;
- const filler = options.inlineFillerPosition;
- if ( filler && filler.parent == viewText.parent && filler.offset == viewText.index ) {
- expectedText = INLINE_FILLER + expectedText;
- }
- if ( actualText != expectedText ) {
- const actions = fastDiff( actualText, expectedText );
- for ( const action of actions ) {
- if ( action.type === 'insert' ) {
- domText.insertData( action.index, action.values.join( '' ) );
- } else { // 'delete'
- domText.deleteData( action.index, action.howMany );
- }
- }
- }
- }
- /**
- * Checks if attribute list needs to be updated and possibly updates it.
- *
- * @private
- * @param {module:engine/view/element~Element} viewElement The view element to update.
- */
- _updateAttrs( viewElement ) {
- const domElement = this.domConverter.mapViewToDom( viewElement );
- if ( !domElement ) {
- // If there is no `domElement` it means that 'viewElement' is outdated as its mapping was updated
- // in 'this._updateChildrenMappings()'. There is no need to process it as new view element which
- // replaced old 'viewElement' mapping was also added to 'this.markedAttributes'
- // in 'this._updateChildrenMappings()' so it will be processed separately.
- return;
- }
- const domAttrKeys = Array.from( domElement.attributes ).map( attr => attr.name );
- const viewAttrKeys = viewElement.getAttributeKeys();
- // Add or overwrite attributes.
- for ( const key of viewAttrKeys ) {
- domElement.setAttribute( key, viewElement.getAttribute( key ) );
- }
- // Remove from DOM attributes which do not exists in the view.
- for ( const key of domAttrKeys ) {
- if ( !viewElement.hasAttribute( key ) ) {
- domElement.removeAttribute( key );
- }
- }
- }
- /**
- * Checks if elements child list needs to be updated and possibly updates it.
- *
- * @private
- * @param {module:engine/view/element~Element} viewElement View element to update.
- * @param {Object} options
- * @param {module:engine/view/position~Position} options.inlineFillerPosition The position where the inline
- * filler should be rendered.
- */
- _updateChildren( viewElement, options ) {
- const domElement = this.domConverter.mapViewToDom( viewElement );
- if ( !domElement ) {
- // If there is no `domElement` it means that it was already removed from DOM.
- // There is no need to process it. It will be processed when re-inserted.
- return;
- }
- const inlineFillerPosition = options.inlineFillerPosition;
- const actualDomChildren = this.domConverter.mapViewToDom( viewElement ).childNodes;
- const expectedDomChildren = Array.from(
- this.domConverter.viewChildrenToDom( viewElement, domElement.ownerDocument, { bind: true, inlineFillerPosition } )
- );
- // Inline filler element has to be created as it is present in the DOM, but not in the view. It is required
- // during diffing so text nodes could be compared correctly and also during rendering to maintain
- // proper order and indexes while updating the DOM.
- if ( inlineFillerPosition && inlineFillerPosition.parent === viewElement ) {
- addInlineFiller( domElement.ownerDocument, expectedDomChildren, inlineFillerPosition.offset );
- }
- const diff = this._diffNodeLists( actualDomChildren, expectedDomChildren );
- let i = 0;
- const nodesToUnbind = new Set();
- for ( const action of diff ) {
- if ( action === 'insert' ) {
- insertAt( domElement, i, expectedDomChildren[ i ] );
- i++;
- } else if ( action === 'delete' ) {
- nodesToUnbind.add( actualDomChildren[ i ] );
- remove( actualDomChildren[ i ] );
- } else { // 'equal'
- // Force updating text nodes inside elements which did not change and do not need to be re-rendered (#1125).
- this._markDescendantTextToSync( this.domConverter.domToView( expectedDomChildren[ i ] ) );
- i++;
- }
- }
- // Unbind removed nodes. When node does not have a parent it means that it was removed from DOM tree during
- // comparision with the expected DOM. We don't need to check child nodes, because if child node was reinserted,
- // it was moved to DOM tree out of the removed node.
- for ( const node of nodesToUnbind ) {
- if ( !node.parentNode ) {
- this.domConverter.unbindDomElement( node );
- }
- }
- }
- /**
- * Shorthand for diffing two arrays or node lists of DOM nodes.
- *
- * @private
- * @param {Array.<Node>|NodeList} actualDomChildren Actual DOM children
- * @param {Array.<Node>|NodeList} expectedDomChildren Expected DOM children.
- * @returns {Array.<String>} The list of actions based on the {@link module:utils/diff~diff} function.
- */
- _diffNodeLists( actualDomChildren, expectedDomChildren ) {
- actualDomChildren = filterOutFakeSelectionContainer( actualDomChildren, this._fakeSelectionContainer );
- return diff( actualDomChildren, expectedDomChildren, sameNodes.bind( null, this.domConverter ) );
- }
- /**
- * Finds DOM nodes that were replaced with the similar nodes (same tag name) in the view. All nodes are compared
- * within one `insert`/`delete` action group, for example:
- *
- * Actual DOM: <p><b>Foo</b>Bar<i>Baz</i><b>Bax</b></p>
- * Expected DOM: <p>Bar<b>123</b><i>Baz</i><b>456</b></p>
- * Input actions: [ insert, insert, delete, delete, equal, insert, delete ]
- * Output actions: [ insert, replace, delete, equal, replace ]
- *
- * @private
- * @param {Array.<String>} actions Actions array which is a result of the {@link module:utils/diff~diff} function.
- * @param {Array.<Node>|NodeList} actualDom Actual DOM children
- * @param {Array.<Node>} expectedDom Expected DOM children.
- * @returns {Array.<String>} Actions array modified with the `replace` actions.
- */
- _findReplaceActions( actions, actualDom, expectedDom ) {
- // If there is no both 'insert' and 'delete' actions, no need to check for replaced elements.
- if ( actions.indexOf( 'insert' ) === -1 || actions.indexOf( 'delete' ) === -1 ) {
- return actions;
- }
- let newActions = [];
- let actualSlice = [];
- let expectedSlice = [];
- const counter = { equal: 0, insert: 0, delete: 0 };
- for ( const action of actions ) {
- if ( action === 'insert' ) {
- expectedSlice.push( expectedDom[ counter.equal + counter.insert ] );
- } else if ( action === 'delete' ) {
- actualSlice.push( actualDom[ counter.equal + counter.delete ] );
- } else { // equal
- newActions = newActions.concat( diff( actualSlice, expectedSlice, areSimilar ).map( x => x === 'equal' ? 'replace' : x ) );
- newActions.push( 'equal' );
- // Reset stored elements on 'equal'.
- actualSlice = [];
- expectedSlice = [];
- }
- counter[ action ]++;
- }
- return newActions.concat( diff( actualSlice, expectedSlice, areSimilar ).map( x => x === 'equal' ? 'replace' : x ) );
- }
- /**
- * Marks text nodes to be synchronized.
- *
- * If a text node is passed, it will be marked. If an element is passed, all descendant text nodes inside it will be marked.
- *
- * @private
- * @param {module:engine/view/node~Node} viewNode View node to sync.
- */
- _markDescendantTextToSync( viewNode ) {
- if ( !viewNode ) {
- return;
- }
- if ( viewNode.is( 'text' ) ) {
- this.markedTexts.add( viewNode );
- } else if ( viewNode.is( 'element' ) ) {
- for ( const child of viewNode.getChildren() ) {
- this._markDescendantTextToSync( child );
- }
- }
- }
- /**
- * Checks if the selection needs to be updated and possibly updates it.
- *
- * @private
- */
- _updateSelection() {
- // If there is no selection - remove DOM and fake selections.
- if ( this.selection.rangeCount === 0 ) {
- this._removeDomSelection();
- this._removeFakeSelection();
- return;
- }
- const domRoot = this.domConverter.mapViewToDom( this.selection.editableElement );
- // Do nothing if there is no focus, or there is no DOM element corresponding to selection's editable element.
- if ( !this.isFocused || !domRoot ) {
- return;
- }
- // Render selection.
- if ( this.selection.isFake ) {
- this._updateFakeSelection( domRoot );
- } else {
- this._removeFakeSelection();
- this._updateDomSelection( domRoot );
- }
- }
- /**
- * Updates the fake selection.
- *
- * @private
- * @param {HTMLElement} domRoot A valid DOM root where the fake selection container should be added.
- */
- _updateFakeSelection( domRoot ) {
- const domDocument = domRoot.ownerDocument;
- if ( !this._fakeSelectionContainer ) {
- this._fakeSelectionContainer = createFakeSelectionContainer( domDocument );
- }
- const container = this._fakeSelectionContainer;
- // Bind fake selection container with the current selection *position*.
- this.domConverter.bindFakeSelection( container, this.selection );
- if ( !this._fakeSelectionNeedsUpdate( domRoot ) ) {
- return;
- }
- if ( !container.parentElement || container.parentElement != domRoot ) {
- domRoot.appendChild( container );
- }
- container.textContent = this.selection.fakeSelectionLabel || '\u00A0';
- const domSelection = domDocument.getSelection();
- const domRange = domDocument.createRange();
- domSelection.removeAllRanges();
- domRange.selectNodeContents( container );
- domSelection.addRange( domRange );
- }
- /**
- * Updates the DOM selection.
- *
- * @private
- * @param {HTMLElement} domRoot A valid DOM root where the DOM selection should be rendered.
- */
- _updateDomSelection( domRoot ) {
- const domSelection = domRoot.ownerDocument.defaultView.getSelection();
- // Let's check whether DOM selection needs updating at all.
- if ( !this._domSelectionNeedsUpdate( domSelection ) ) {
- return;
- }
- // Multi-range selection is not available in most browsers, and, at least in Chrome, trying to
- // set such selection, that is not continuous, throws an error. Because of that, we will just use anchor
- // and focus of view selection.
- // Since we are not supporting multi-range selection, we also do not need to check if proper editable is
- // selected. If there is any editable selected, it is okay (editable is taken from selection anchor).
- const anchor = this.domConverter.viewPositionToDom( this.selection.anchor );
- const focus = this.domConverter.viewPositionToDom( this.selection.focus );
- // Focus the new editing host.
- // Otherwise, FF may throw an error (https://github.com/ckeditor/ckeditor5/issues/721).
- domRoot.focus();
- domSelection.collapse( anchor.parent, anchor.offset );
- domSelection.extend( focus.parent, focus.offset );
- // Firefox–specific hack (https://github.com/ckeditor/ckeditor5-engine/issues/1439).
- if ( env.isGecko ) {
- fixGeckoSelectionAfterBr( focus, domSelection );
- }
- }
- /**
- * Checks whether a given DOM selection needs to be updated.
- *
- * @private
- * @param {Selection} domSelection The DOM selection to check.
- * @returns {Boolean}
- */
- _domSelectionNeedsUpdate( domSelection ) {
- if ( !this.domConverter.isDomSelectionCorrect( domSelection ) ) {
- // Current DOM selection is in incorrect position. We need to update it.
- return true;
- }
- const oldViewSelection = domSelection && this.domConverter.domSelectionToView( domSelection );
- if ( oldViewSelection && this.selection.isEqual( oldViewSelection ) ) {
- return false;
- }
- // If selection is not collapsed, it does not need to be updated if it is similar.
- if ( !this.selection.isCollapsed && this.selection.isSimilar( oldViewSelection ) ) {
- // Selection did not changed and is correct, do not update.
- return false;
- }
- // Selections are not similar.
- return true;
- }
- /**
- * Checks whether the fake selection needs to be updated.
- *
- * @private
- * @param {HTMLElement} domRoot A valid DOM root where a new fake selection container should be added.
- * @returns {Boolean}
- */
- _fakeSelectionNeedsUpdate( domRoot ) {
- const container = this._fakeSelectionContainer;
- const domSelection = domRoot.ownerDocument.getSelection();
- // Fake selection needs to be updated if there's no fake selection container, or the container currently sits
- // in a different root.
- if ( !container || container.parentElement !== domRoot ) {
- return true;
- }
- // Make sure that the selection actually is within the fake selection.
- if ( domSelection.anchorNode !== container && !container.contains( domSelection.anchorNode ) ) {
- return true;
- }
- return container.textContent !== this.selection.fakeSelectionLabel;
- }
- /**
- * Removes the DOM selection.
- *
- * @private
- */
- _removeDomSelection() {
- for ( const doc of this.domDocuments ) {
- const domSelection = doc.getSelection();
- if ( domSelection.rangeCount ) {
- const activeDomElement = doc.activeElement;
- const viewElement = this.domConverter.mapDomToView( activeDomElement );
- if ( activeDomElement && viewElement ) {
- doc.getSelection().removeAllRanges();
- }
- }
- }
- }
- /**
- * Removes the fake selection.
- *
- * @private
- */
- _removeFakeSelection() {
- const container = this._fakeSelectionContainer;
- if ( container ) {
- container.remove();
- }
- }
- /**
- * Checks if focus needs to be updated and possibly updates it.
- *
- * @private
- */
- _updateFocus() {
- if ( this.isFocused ) {
- const editable = this.selection.editableElement;
- if ( editable ) {
- this.domConverter.focus( editable );
- }
- }
- }
- }
- mix( Renderer, ObservableMixin );
- // Checks if provided element is editable.
- //
- // @private
- // @param {module:engine/view/element~Element} element
- // @returns {Boolean}
- function isEditable( element ) {
- if ( element.getAttribute( 'contenteditable' ) == 'false' ) {
- return false;
- }
- const parent = element.findAncestor( element => element.hasAttribute( 'contenteditable' ) );
- return !parent || parent.getAttribute( 'contenteditable' ) == 'true';
- }
- // Adds inline filler at a given position.
- //
- // The position can be given as an array of DOM nodes and an offset in that array,
- // or a DOM parent element and an offset in that element.
- //
- // @private
- // @param {Document} domDocument
- // @param {Element|Array.<Node>} domParentOrArray
- // @param {Number} offset
- // @returns {Text} The DOM text node that contains an inline filler.
- function addInlineFiller( domDocument, domParentOrArray, offset ) {
- const childNodes = domParentOrArray instanceof Array ? domParentOrArray : domParentOrArray.childNodes;
- const nodeAfterFiller = childNodes[ offset ];
- if ( isText( nodeAfterFiller ) ) {
- nodeAfterFiller.data = INLINE_FILLER + nodeAfterFiller.data;
- return nodeAfterFiller;
- } else {
- const fillerNode = domDocument.createTextNode( INLINE_FILLER );
- if ( Array.isArray( domParentOrArray ) ) {
- childNodes.splice( offset, 0, fillerNode );
- } else {
- insertAt( domParentOrArray, offset, fillerNode );
- }
- return fillerNode;
- }
- }
- // Whether two DOM nodes should be considered as similar.
- // Nodes are considered similar if they have the same tag name.
- //
- // @private
- // @param {Node} node1
- // @param {Node} node2
- // @returns {Boolean}
- function areSimilar( node1, node2 ) {
- return isNode( node1 ) && isNode( node2 ) &&
- !isText( node1 ) && !isText( node2 ) &&
- node1.tagName.toLowerCase() === node2.tagName.toLowerCase();
- }
- // Whether two dom nodes should be considered as the same.
- // Two nodes which are considered the same are:
- //
- // * Text nodes with the same text.
- // * Element nodes represented by the same object.
- // * Two block filler elements.
- //
- // @private
- // @param {String} blockFillerMode Block filler mode, see {@link module:engine/view/domconverter~DomConverter#blockFillerMode}.
- // @param {Node} node1
- // @param {Node} node2
- // @returns {Boolean}
- function sameNodes( domConverter, actualDomChild, expectedDomChild ) {
- // Elements.
- if ( actualDomChild === expectedDomChild ) {
- return true;
- }
- // Texts.
- else if ( isText( actualDomChild ) && isText( expectedDomChild ) ) {
- return actualDomChild.data === expectedDomChild.data;
- }
- // Block fillers.
- else if ( domConverter.isBlockFiller( actualDomChild ) &&
- domConverter.isBlockFiller( expectedDomChild ) ) {
- return true;
- }
- // Not matching types.
- return false;
- }
- // The following is a Firefox–specific hack (https://github.com/ckeditor/ckeditor5-engine/issues/1439).
- // When the native DOM selection is at the end of the block and preceded by <br /> e.g.
- //
- // <p>foo<br/>[]</p>
- //
- // which happens a lot when using the soft line break, the browser fails to (visually) move the
- // caret to the new line. A quick fix is as simple as force–refreshing the selection with the same range.
- function fixGeckoSelectionAfterBr( focus, domSelection ) {
- const parent = focus.parent;
- // This fix works only when the focus point is at the very end of an element.
- // There is no point in running it in cases unrelated to the browser bug.
- if ( parent.nodeType != Node.ELEMENT_NODE || focus.offset != parent.childNodes.length - 1 ) {
- return;
- }
- const childAtOffset = parent.childNodes[ focus.offset ];
- // To stay on the safe side, the fix being as specific as possible, it targets only the
- // selection which is at the very end of the element and preceded by <br />.
- if ( childAtOffset && childAtOffset.tagName == 'BR' ) {
- domSelection.addRange( domSelection.getRangeAt( 0 ) );
- }
- }
- function filterOutFakeSelectionContainer( domChildList, fakeSelectionContainer ) {
- const childList = Array.from( domChildList );
- if ( childList.length == 0 || !fakeSelectionContainer ) {
- return childList;
- }
- const last = childList[ childList.length - 1 ];
- if ( last == fakeSelectionContainer ) {
- childList.pop();
- }
- return childList;
- }
- // Creates a fake selection container for a given document.
- //
- // @private
- // @param {Document} domDocument
- // @returns {HTMLElement}
- function createFakeSelectionContainer( domDocument ) {
- const container = domDocument.createElement( 'div' );
- Object.assign( container.style, {
- position: 'fixed',
- top: 0,
- left: '-9999px',
- // See https://github.com/ckeditor/ckeditor5/issues/752.
- width: '42px'
- } );
- // Fill it with a text node so we can update it later.
- container.textContent = '\u00A0';
- return container;
- }
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