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https://bitbucket.org/wisemapping/wisemapping-frontend.git
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95 lines
2.6 KiB
TypeScript
95 lines
2.6 KiB
TypeScript
/*
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* Copyright [2021] [wisemapping]
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*
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* Licensed under WiseMapping Public License, Version 1.0 (the "License").
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* It is basically the Apache License, Version 2.0 (the "License") plus the
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* "powered by wisemapping" text requirement on every single page;
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the license at
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*
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* http://www.wisemapping.org/license
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import { $assert } from '@wisemapping/core-js';
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import Command from './Command';
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import CommandContext from './CommandContext';
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class DesignerUndoManager {
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private _undoQueue: Command[];
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private _redoQueue: Command[];
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private _baseId: number;
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constructor() {
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this._undoQueue = [];
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this._redoQueue = [];
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this._baseId = 0;
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}
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enqueue(command: Command) {
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$assert(command, 'Command can not be null');
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const { length } = this._undoQueue;
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if (command.discardDuplicated && length > 0) {
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// Skip duplicated events ...
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const lastItem = this._undoQueue[length - 1];
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if (lastItem.discardDuplicated !== command.discardDuplicated) {
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this._undoQueue.push(command);
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}
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} else {
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this._undoQueue.push(command);
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}
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this._redoQueue = [];
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}
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execUndo(commandContext: CommandContext) {
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if (this._undoQueue.length > 0) {
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const command = this._undoQueue.pop();
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this._redoQueue.push(command);
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command.undoExecute(commandContext);
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}
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}
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execRedo(commandContext) {
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if (this._redoQueue.length > 0) {
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const command = this._redoQueue.pop();
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this._undoQueue.push(command);
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command.execute(commandContext);
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}
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}
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buildEvent() {
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return { undoSteps: this._undoQueue.length, redoSteps: this._redoQueue.length };
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}
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markAsChangeBase() {
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const undoLength = this._undoQueue.length;
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if (undoLength > 0) {
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const command = this._undoQueue[undoLength - 1];
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this._baseId = command.getId();
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} else {
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this._baseId = 0;
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}
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}
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hasBeenChanged() {
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let result = true;
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const undoLength = this._undoQueue.length;
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if (undoLength === 0 && this._baseId === 0) {
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result = false;
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} else if (undoLength > 0) {
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const command = this._undoQueue[undoLength - 1];
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result = (this._baseId !== command.getId());
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}
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return result;
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}
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}
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export default DesignerUndoManager;
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