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- /**
- * @license Copyright (c) 2003-2017, 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 is changed due to changes in the {@link module:engine/model/document~Document document}.
- *
- * @event change
- * @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/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() {
- // Operation types that a range can be transformed by.
- const supportedTypes = new Set( [ 'insert', 'move', 'remove', 'reinsert' ] );
- this.listenTo(
- this.root.document,
- 'change',
- ( event, type, changes, batch, deltaType ) => {
- if ( supportedTypes.has( type ) ) {
- transform.call( this, type, deltaType, batch, changes.range, changes.sourcePosition );
- }
- },
- { priority: 'high' }
- );
- }
- /**
- * Updates this range accordingly to the updates applied to the model. Bases on change events.
- *
- * @ignore
- * @private
- * @method transform
- * @param {String} [changeType] Type of change applied to the model document.
- * @param {String} [deltaType] Type of delta which introduced the change.
- * @param {module:engine/model/batch~Batch} batch Batch which changes the live range.
- * @param {module:engine/model/range~Range} targetRange Range containing the result of applied change.
- * @param {module:engine/model/position~Position} [sourcePosition] Source position for move, remove and reinsert change types.
- */
- function transform( changeType, deltaType, batch, targetRange, sourcePosition ) {
- const howMany = targetRange.end.offset - targetRange.start.offset;
- let targetPosition = targetRange.start;
- if ( changeType == 'move' || changeType == 'remove' || changeType == 'reinsert' ) {
- // Range._getTransformedByDocumentChange is expecting `targetPosition` to be "before" move
- // (before transformation). `targetRange.start` is already after the move happened.
- // We have to revert `targetPosition` to the state before the move.
- targetPosition = targetPosition._getTransformedByInsertion( sourcePosition, howMany );
- }
- const result = this._getTransformedByDocumentChange( changeType, deltaType, targetPosition, howMany, sourcePosition );
- // Decide whether moved part should be included in the range.
- //
- // First, this concerns only `move` change, because insert change includes inserted part always (changeType == 'move').
- // Second, this is a case only if moved range was intersecting with this range and was inserted into this range (result.length == 3).
- if ( ( changeType == 'move' || changeType == 'remove' || changeType == 'reinsert' ) && result.length == 3 ) {
- // `result[ 2 ]` is a "common part" of this range and moved range. We substitute that common part with the whole
- // `targetRange` because we want to include whole `targetRange` in this range.
- result[ 2 ] = targetRange;
- }
- const updated = Range.createFromRanges( result );
- // If anything changed, update the range and fire an event.
- if ( !updated.isEqual( this ) ) {
- const oldRange = Range.createFromRange( this );
- this.start = updated.start;
- this.end = updated.end;
- this.fire( 'change', oldRange, {
- type: changeType,
- batch,
- range: targetRange,
- sourcePosition
- } );
- }
- }
- mix( LiveRange, EmitterMixin );
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