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/**
* @license Copyright (c) 2003-2021, 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();
}
}