/// <summary>
/// Performs an undo action.
/// </summary>
/// <returns>
/// Returns true if the undo action succeeds; otherwise, returns false.
/// </returns>
public bool Undo()
{
bool flag = true;
if (AllowUndo && CanUndo)
{
IUndo undo = UndoList.Peek() as IUndo;
try
{
if ((undo != null) && undo.CanUndo)
{
flag = undo.Undo(Context);
}
}
catch
{
flag = false;
}
if (Context is Excel excel)
{
excel.ResumeInvalidate();
}
if (flag)
{
RedoList.Push(UndoList.Pop());
RaiseChanged(UndoRedoOperation.Undo, undo.ToString());
}
}
return(flag);
}
public bool Undo()
{
if (UndoSize == 0)
{
return(false);
}
var action = UndoList.Pop();
action.PerformRevertAction();
RedoList.Push(action);
return(true);
}
public void Undo()
{
if (CanUndo == false)
{
return;
}
RedoList.Push(_value);
_value = UndoList.Pop();
OnPropertyChanged("Value");
OnPropertyChanged("CanUndo");
OnPropertyChanged("CanRedo");
}