public void Undo()
{
IDrawingCommand command = _undoCommands.Pop();
command.Undo();
_redoCommands.Push(command);
}
public void Redo()
{
IDrawingCommand command = _redoCommands.Pop();
command.Execute();
_undoCommands.Push(command);
}
public void Execute(IDrawingCommand command)
{
_redoCommands.Clear();
_undoCommands.Push(command);
command.Execute();
}
