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- /**
- * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.
- * For licensing, see LICENSE.md.
- */
- /**
- * @module engine/model/liverange
- */
- import Range from './range';
- import EmitterMixin from '@ckeditor/ckeditor5-utils/src/emittermixin';
- import mix from '@ckeditor/ckeditor5-utils/src/mix';
- /**
- * `LiveRange` is a type of {@link module:engine/model/range~Range Range}
- * that updates itself as {@link module:engine/model/document~Document document}
- * is changed through operations. It may be used as a bookmark.
- *
- * **Note:** Be very careful when dealing with `LiveRange`. Each `LiveRange` instance bind events that might
- * have to be unbound. Use {@link module:engine/model/liverange~LiveRange#detach detach} whenever you don't need `LiveRange` anymore.
- */
- export default class LiveRange extends Range {
- /**
- * Creates a live range.
- *
- * @see module:engine/model/range~Range
- */
- constructor( start, end ) {
- super( start, end );
- bindWithDocument.call( this );
- }
- /**
- * Unbinds all events previously bound by `LiveRange`. Use it whenever you don't need `LiveRange` instance
- * anymore (i.e. when leaving scope in which it was declared or before re-assigning variable that was
- * referring to it).
- */
- detach() {
- this.stopListening();
- }
- /**
- * @see module:engine/model/range~Range.createIn
- * @static
- * @method module:engine/model/liverange~LiveRange.createIn
- * @param {module:engine/model/element~Element} element
- * @returns {module:engine/model/liverange~LiveRange}
- */
- /**
- * @see module:engine/model/range~Range.createFromPositionAndShift
- * @static
- * @method module:engine/model/liverange~LiveRange.createFromPositionAndShift
- * @param {module:engine/model/position~Position} position
- * @param {Number} shift
- * @returns {module:engine/model/liverange~LiveRange}
- */
- /**
- * @see module:engine/model/range~Range.createFromParentsAndOffsets
- * @static
- * @method module:engine/model/liverange~LiveRange.createFromParentsAndOffsets
- * @param {module:engine/model/element~Element} startElement
- * @param {Number} startOffset
- * @param {module:engine/model/element~Element} endElement
- * @param {Number} endOffset
- * @returns {module:engine/model/liverange~LiveRange}
- */
- /**
- * @see module:engine/model/range~Range.createFromRange
- * @static
- * @method module:engine/model/liverange~LiveRange.createFromRange
- * @param {module:engine/model/range~Range} range
- * @returns {module:engine/model/liverange~LiveRange}
- */
- /**
- * Fired when `LiveRange` instance boundaries have changed due to changes in the
- * {@link module:engine/model/document~Document document}.
- *
- * @event change:range
- * @param {module:engine/model/range~Range} oldRange Range with start and end position equal to start and end position of this live
- * range before it got changed.
- * @param {Object} data Object with additional information about the change. Those parameters are passed from
- * {@link module:engine/model/document~Document#event:change document change event}.
- * @param {String} data.type Change type.
- * @param {module:engine/model/position~Position|null} deletionPosition Source position for move, remove and reinsert change types.
- */
- /**
- * Fired when `LiveRange` instance boundaries have not changed after a change in {@link module:engine/model/document~Document document}
- * but the change took place inside the range, effectively changing its content.
- *
- * @event change:content
- * @param {module:engine/model/range~Range} range Range with start and end position equal to start and end position of
- * change range.
- * @param {Object} data Object with additional information about the change. Those parameters are passed from
- * {@link module:engine/model/document~Document#event:change document change event}.
- * @param {String} data.type Change type.
- * @param {module:engine/model/batch~Batch} data.batch Batch which changed the live range.
- * @param {module:engine/model/range~Range} data.range Range containing the result of applied change.
- * @param {module:engine/model/position~Position} data.sourcePosition Source position for move, remove and reinsert change types.
- */
- }
- /**
- * Binds this `LiveRange` to the {@link module:engine/model/document~Document document}
- * that owns this range's {@link module:engine/model/range~Range#root root}.
- *
- * @ignore
- * @private
- * @method module:engine/model/liverange~LiveRange#bindWithDocument
- */
- function bindWithDocument() {
- this.listenTo(
- this.root.document.model,
- 'applyOperation',
- ( event, args ) => {
- const operation = args[ 0 ];
- if ( !operation.isDocumentOperation ) {
- return;
- }
- transform.call( this, operation );
- },
- { priority: 'low' }
- );
- }
- /**
- * Updates this range accordingly to the updates applied to the model. Bases on change events.
- *
- * @ignore
- * @private
- * @method transform
- * @param {module:engine/model/operation/operation~Operation} operation Executed operation.
- */
- function transform( operation ) {
- const ranges = this.getTransformedByOperation( operation );
- const result = Range.createFromRanges( ranges );
- const boundariesChanged = !result.isEqual( this );
- const contentChanged = doesOperationChangeRangeContent( this, operation );
- let deletionPosition = null;
- if ( boundariesChanged ) {
- if ( result.root.rootName == '$graveyard' ) {
- if ( operation.type == 'remove' ) {
- deletionPosition = operation.sourcePosition;
- } else {
- // Merge operation.
- deletionPosition = operation.deletionPosition;
- }
- }
- // If range boundaries have changed, fire `change:range` event.
- const oldRange = Range.createFromRange( this );
- this.start = result.start;
- this.end = result.end;
- this.fire( 'change:range', oldRange, { deletionPosition } );
- } else if ( contentChanged ) {
- // If range boundaries have not changed, but there was change inside the range, fire `change:content` event.
- this.fire( 'change:content', Range.createFromRange( this ), { deletionPosition } );
- }
- }
- function doesOperationChangeRangeContent( range, operation ) {
- switch ( operation.type ) {
- case 'insert':
- case 'split':
- case 'wrap':
- case 'unwrap':
- return range.containsPosition( operation.position );
- case 'move':
- case 'remove':
- case 'reinsert':
- case 'merge':
- return range.containsPosition( operation.sourcePosition ) ||
- range.start.isEqual( operation.sourcePosition ) ||
- range.containsPosition( operation.targetPosition );
- }
- return false;
- }
- mix( LiveRange, EmitterMixin );
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