wisemapping-frontend/packages/mindplot/src/components/DesignerUndoManager.ts
2022-07-13 01:45:36 +00:00

95 lines
2.6 KiB
TypeScript

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