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- /**
- * @license Copyright (c) 2003-2016, CKSource - Frederico Knabben. All rights reserved.
- * For licensing, see LICENSE.md.
- */
- 'use strict';
- import MoveOperation from './moveoperation.js';
- import Position from '../position.js';
- import Element from '../element.js';
- import ReinsertOperation from './reinsertoperation.js';
- /**
- * Operation to remove a range of nodes.
- *
- * @memberOf engine.model.operation
- * @extends engine.model.operation.Operation
- */
- export default class RemoveOperation extends MoveOperation {
- /**
- *
- * Creates a remove operation.
- *
- * @param {engine.model.Position} position Position before the first node to remove.
- * @param {Number} howMany How many nodes to remove.
- * @param {Number} baseVersion {@link engine.model.Document#version} on which operation can be applied.
- */
- constructor( position, howMany, baseVersion ) {
- const graveyard = position.root.document.graveyard;
- super( position, howMany, new Position( graveyard, [ graveyard.getChildCount(), 0 ] ), baseVersion );
- }
- /**
- * @inheritDoc
- */
- get type() {
- return 'remove';
- }
- /**
- * Offset of the graveyard "holder" element, in which nodes removed by this operation are stored.
- *
- * @protected
- * @type {Number}
- */
- get _holderElementOffset() {
- return this.targetPosition.path[ 0 ];
- }
- /**
- * Sets {@link engine.model.operation.RemoveOperation#_holderElementOffset}.
- *
- * @protected
- * @param {Number} offset
- */
- set _holderElementOffset( offset ) {
- this.targetPosition.path[ 0 ] = offset;
- }
- /**
- * Flag informing whether this operation should insert "holder" element (`true`) or should remove nodes
- * into existing "holder" element (`false`). It is `true` for each `RemoveOperation` that is the first `RemoveOperation`
- * in it's delta which points to given holder element.
- *
- * @protected
- * @type {Boolean}
- */
- get _needsHolderElement() {
- if ( this.delta ) {
- // Let's look up all operations from this delta in the same order as they are in the delta.
- for ( let operation of this.delta.operations ) {
- // We are interested only in `RemoveOperation`s.
- if ( operation instanceof RemoveOperation ) {
- // If the first `RemoveOperation` in the delta is this operation, this operation
- // needs to insert holder element in the graveyard.
- if ( operation == this ) {
- return true;
- } else if ( operation._holderElementOffset == this._holderElementOffset ) {
- // If there is a `RemoveOperation` in this delta that "points" to the same holder element offset,
- // that operation will already insert holder element at that offset. We should not create another holder.
- return false;
- }
- }
- }
- }
- // By default `RemoveOperation` needs holder element, so set it so, if the operation does not have delta.
- return true;
- }
- /**
- * @returns {engine.model.operation.ReinsertOperation}
- */
- getReversed() {
- return new ReinsertOperation( this.targetPosition, this.howMany, this.sourcePosition, this.baseVersion + 1 );
- }
- /**
- * @returns {engine.model.operation.RemoveOperation}
- */
- clone() {
- let removeOperation = new RemoveOperation( this.sourcePosition, this.howMany, this.baseVersion );
- removeOperation.targetPosition = Position.createFromPosition( this.targetPosition );
- removeOperation.movedRangeStart = Position.createFromPosition( this.movedRangeStart );
- return removeOperation;
- }
- /**
- * @inheritDoc
- */
- _execute() {
- if ( this._needsHolderElement ) {
- const graveyard = this.targetPosition.root;
- const holderElement = new Element( '$graveyardHolder' );
- graveyard.insertChildren( this.targetPosition.path[ 0 ], holderElement );
- }
- return super._execute();
- }
- /**
- * @inheritDoc
- */
- static get className() {
- return 'engine.model.operation.RemoveOperation';
- }
- }
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