public void Redo()
{
if (HistoryRedo.Count > 0)
{
ArchitectCommand command = HistoryRedo.Pop();
command.Do();
History.Push(command);
}
}
public void Undo()
{
if (History.Count > 0)
{
ArchitectCommand bc = History.Pop();
bc.Undo();
HistoryRedo.Push(bc);
}
}
