/// <summary>Undo an action. Calls IHistoryAction.Undo().</summary>
/// <remarks>Does nothing if there is no action to undo.</remarks>
public void Undo()
{
if (undo.Count == 0)
{
return;
}
IHistoryAction action = undo.Pop();
redo.Push(action);
action.Undo();
}
public void Undo()
{
if (_history.Count == 0)
{
throw new NothingToUndoException();
}
IHistoryAction action = _history.Pop();
_future.Push(action);
_acceptNew = false;
action.Undo();
_acceptNew = true;
CanUndo = _history.Count > 0;
CanRedo = true;
}