protected override bool OnScrollEvent(Gdk.EventScroll evnt)
{
if(evnt.Type != Gdk.EventType.Scroll) {
return false;
}
if(evnt.Direction == Gdk.ScrollDirection.Up) {
AdjustVolume(1);
} else if(evnt.Direction == Gdk.ScrollDirection.Down) {
AdjustVolume(-1);
}
return true;
}