protected boolean onTransition(Transition.Type type, int hint, boolean briefAnnouncement) {
NullCheck.notNull(type, "type");
// NullCheck.notNull(hint, "hint");
if (noContent()) return true;
final int index = selectedIndex();
final int count = model.getItemCount();
final int emptyCountTop = flags.contains(Flags.EMPTY_LINE_TOP) ? 1 : 0;
final Transition.State current;
if (index >= 0) current = new Transition.State(index);
else if (flags.contains(Flags.EMPTY_LINE_TOP) && hotPointY == 0)
current = new Transition.State(Transition.State.Type.EMPTY_LINE_TOP);
else if (flags.contains(Flags.EMPTY_LINE_BOTTOM) && hotPointY == count + emptyCountTop)
current = new Transition.State(Transition.State.Type.EMPTY_LINE_BOTTOM);
else return false;
final Transition.State newState =
transition.transition(
type,
current,
count,
flags.contains(Flags.EMPTY_LINE_TOP),
flags.contains(Flags.EMPTY_LINE_BOTTOM));
NullCheck.notNull(newState, "newState");
Log.debug("list", "newState=" + newState.type);
switch (newState.type) {
case NO_TRANSITION:
environment.hint(hint);
return true;
case EMPTY_LINE_TOP:
if (!flags.contains(Flags.EMPTY_LINE_TOP)) return false;
hotPointY = 0;
break;
case EMPTY_LINE_BOTTOM:
if (!flags.contains(Flags.EMPTY_LINE_BOTTOM)) return false;
hotPointY = count + emptyCountTop;
break;
case ITEM_INDEX:
if (newState.itemIndex < 0 || newState.itemIndex >= count) return false;
hotPointY = newState.itemIndex + emptyCountTop;
break;
default:
return false;
}
onNewHotPointY(briefAnnouncement);
return true;
}
