undo abstract method
Undo the last operation of the whiteboard.
Returns
- ResultCode.OK Success
- others: Failure
撤销白板上一次操作。
Returns
- ResultCode.OK 成功
- 其他: 失败
Implementation
Future<ResultCode> undo();
undo abstract method
Undo the last operation of the whiteboard.
Returns
撤销白板上一次操作。
Returns
Future<ResultCode> undo();