public void UnregisterSweepModeObserver(ISweepModeObserver ob)
{
if (ob != null && _sweepModeObs.Contains(ob))
{
_sweepModeObs.Remove(ob);
}
}
public void RegisterSweepModeObserver(ISweepModeObserver ob)
{
if (ob != null && !_sweepModeObs.Contains(ob))
{
_sweepModeObs.Add(ob);
}
}
