public void AddHandler(HistoryHandler handler)
{
handler.ActionPush += (sender, action) => {
if (!_acceptNew)
{
return;
}
_history.Push(action);
Past.Add(action);
_future.Clear();
Future.Clear();
CanRedo = false;
CanUndo = true;
};
}
public void Redo()
{
if (_future.Count == 0)
{
throw new NothingToRedoException();
}
IHistoryAction action = _future.Pop();
_history.Push(action);
Future.RemoveAt(0);
Past.Add(action);
_acceptNew = false;
action.Redo();
_acceptNew = true;
CanUndo = true;
CanRedo = _future.Count > 0;
}