@Override
public int getLineCount() {
final int emptyCountTop = flags.contains(Flags.EMPTY_LINE_TOP) ? 1 : 0;
final int emptyCountBottom = flags.contains(Flags.EMPTY_LINE_BOTTOM) ? 1 : 0;
final int res = model.getItemCount() + emptyCountTop + emptyCountBottom;
return res >= 1 ? res : 1;
}
/**
* Selects the item by its index. Given the non-negative integer value as an index, this method
* sets the hot point on the item addressed with this index, checking only that index is in
* appropriate bounds. Index must address the object as a number in the model, ignoring any empty
* lines.
*
* @param index The item index to select
* @param announce Must be true, if it is necessary to announce the item , once it has been
* selected
* @return True if the index is valid and the item gets hot point on it
*/
public boolean select(int index, boolean announce) {
if (index < 0 || index >= model.getItemCount()) return false;
final int emptyCountAbove = flags.contains(Flags.EMPTY_LINE_TOP) ? 1 : 0;
hotPointY = index + emptyCountAbove;
final Object item = model.getItem(index);
if (item != null) {
hotPointX = appearance.getObservableLeftBound(item);
if (announce) appearance.announceItem(item, NONE_APPEARANCE_FLAGS);
} else {
hotPointX = 0;
if (announce) environment.hint(Hints.EMPTY_LINE);
}
environment.onAreaNewHotPoint(this);
return true;
}
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;
}
public int getLineIndexByItemIndex(int index) {
final int count = model.getItemCount();
if (index < 0 || index >= count) return -1;
final int linesTop = flags.contains(Flags.EMPTY_LINE_TOP) ? 1 : 0;
return index + linesTop;
}
public int getItemIndexOnLine(int index) {
final int linesTop = flags.contains(Flags.EMPTY_LINE_TOP) ? 1 : 0;
if (index < linesTop) return -1;
if (index - linesTop < model.getItemCount()) return index - linesTop;
return -1;
}