/// <summary>
/// Juggles stacks to "Redo the latest recorded undone action"
/// </summary>
public void Redo()
{
var redoAct = RedoStack.Pop();
redoAct();
DoStack.Push(redoAct);
UndoStack.Push(BackupStack.Pop());
}
/// <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>
/// 작업을 추가합니다.
/// </summary>
/// <param name="task"></param>
public virtual void Push(TaskData task)
{
ClearUndoStack();
DoStack.Push(task);
task.Do();
Update();
}
/// <summary>
/// Juggles stacks to "Do" something
/// </summary>
/// <param name="DoAct">Do Action</param>
/// <param name="UndoAct">Undo Action</param>
/// <param name="Entry">Weather there should be a new entry for this action in the stacks</param>
public void Do(Action DoAct, Action UndoAct, bool Entry)
{
if (Entry)
{
DoStack.Push(DoAct);
UndoStack.Push(UndoAct);
RedoStack.Clear();
BackupStack.Clear();
}
DoAct();
}
protected virtual void ClearUndoStack()
{
foreach (TaskData task in UndoStack.ToArray().Reverse())
{
// 삭제될 Task의 Source를 참조하고 있는지 확인함
if (!task.IsStable && DoStack.Count(t => t.Source.Equals(task.Source)) == 0)
{
task.Dispose();
}
}
UndoStack.Clear();
}
/// <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);
}
/// <summary>
/// 이전 상태로 되돌린 작업을 취소합니다.
/// </summary>
/// <returns></returns>
public bool Redo()
{
if (CanRedo)
{
TaskData task = UndoStack.Pop();
DoStack.Push(task);
task.Do();
Update();
return(true);
}
return(false);
}
