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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
- */
- /**
- * @module undo/undocommand
- */
- import BaseCommand from './basecommand';
- /**
- * The undo command stores {@link module:engine/model/batch~Batch batches} applied to the
- * {@link module:engine/model/document~Document document} and is able to undo a batch by reversing it and transforming by
- * batches from {@link module:engine/model/document~Document#history history} that happened after the reversed batch.
- *
- * The undo command also takes care of restoring the {@link module:engine/model/document~Document#selection document selection}.
- *
- * @extends module:undo/basecommand~BaseCommand
- */
- export default class UndoCommand extends BaseCommand {
- /**
- * Executes the command. This method reverts a {@link module:engine/model/batch~Batch batch} added to the command's stack, transforms
- * and applies the reverted version on the {@link module:engine/model/document~Document document} and removes the batch from the stack.
- * Then, it restores the {@link module:engine/model/document~Document#selection document selection}.
- *
- * @fires execute
- * @fires revert
- * @param {module:engine/model/batch~Batch} [batch] A batch that should be undone. If not set, the last added batch will be undone.
- */
- execute( batch = null ) {
- // If batch is not given, set `batchIndex` to the last index in command stack.
- const batchIndex = batch ? this._stack.findIndex( a => a.batch == batch ) : this._stack.length - 1;
- const item = this._stack.splice( batchIndex, 1 )[ 0 ];
- const undoingBatch = this.editor.model.createBatch( 'transparent' );
- // All changes has to be done in one `enqueueChange` callback so other listeners will not
- // step between consecutive operations, or won't do changes to the document before selection is properly restored.
- this.editor.model.enqueueChange( undoingBatch, () => {
- this._undo( item.batch, undoingBatch );
- const operations = this.editor.model.document.history.getOperations( item.batch.baseVersion );
- this._restoreSelection( item.selection.ranges, item.selection.isBackward, operations );
- this.fire( 'revert', item.batch, undoingBatch );
- } );
- this.refresh();
- }
- }
- /**
- * Fired when execution of the command reverts some batch.
- *
- * @event revert
- */
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