public void Execute()
{
_previousState = _stero.CurrentState;
_stero.PowerOn();
_stero.Volume = 11;
_stero.TurnToCD();
}
public void Undo()
{
if (_previousState == Stero.State.CD)
{
_stero.PowerOn();
_stero.Volume = _previousVolume;
_stero.TurnToCD();
return;
}
if (_previousState == Stero.State.DVD)
{
_stero.PowerOn();
_stero.Volume = _previousVolume;
_stero.TurnToDVD();
return;
}
if (_previousState == Stero.State.Radio)
{
_stero.PowerOn();
_stero.Volume = _previousVolume;
_stero.TurnToradio();
return;
}
if (_previousState == Stero.State.Off)
{
_stero.PowerOff();
_stero.Volume = _previousVolume;
return;
}
}