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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/redocommand
- */
- import BaseCommand from './basecommand';
- /**
- * The redo command stores {@link module:engine/model/batch~Batch batches} that were used to undo a batch by
- * {@link module:undo/undocommand~UndoCommand}. It is able to redo a previously undone batch by reversing the undoing
- * batches created by `UndoCommand`. The reversed batch is transformed by all the batches from
- * {@link module:engine/model/document~Document#history history} that happened after the reversed undo batch.
- *
- * The redo command also takes care of restoring the {@link module:engine/model/document~Document#selection document selection}.
- *
- * @extends module:undo/basecommand~BaseCommand
- */
- export default class RedoCommand extends BaseCommand {
- /**
- * Executes the command. This method reverts the last {@link module:engine/model/batch~Batch batch} added to
- * the command's stack, applies the reverted and transformed 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
- */
- execute() {
- const item = this._stack.pop();
- const redoingBatch = this.editor.model.createBatch( 'transparent' );
- // All changes have 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( redoingBatch, () => {
- const lastOperation = item.batch.operations[ item.batch.operations.length - 1 ];
- const nextBaseVersion = lastOperation.baseVersion + 1;
- const operations = this.editor.model.document.history.getOperations( nextBaseVersion );
- this._restoreSelection( item.selection.ranges, item.selection.isBackward, operations );
- this._undo( item.batch, redoingBatch );
- } );
- this.refresh();
- }
- }
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