/// <summary>
/// Juggles stacks to "Undo" the latest recorded action
/// </summary>
public void Undo()
{
var undoAct = UndoStack.Pop();
undoAct();
BackupStack.Push(undoAct);
RedoStack.Push(DoStack.Pop());
}
/// <summary>
/// 이전 상태로 되돌아갑니다.
/// </summary>
/// <returns></returns>
public bool Undo()
{
if (DoStack.Count > 0)
{
TaskData task = DoStack.Pop();
UndoStack.Push(task);
task.Undo();
Update();
return(true);
}
return(false);
}