private boolean onPageUp(KeyboardEvent event, boolean briefIntroduction) {
if (noContentCheck()) return true;
if (hotPointY <= 0) {
luwrain.hint(Hints.NO_ITEMS_ABOVE);
return true;
}
final int visibleHeight = luwrain.getAreaVisibleHeight(this);
if (visibleHeight < 1) return false;
if (hotPointY > visibleHeight) hotPointY -= visibleHeight;
else hotPointY = 0;
onNewHotPointY(briefIntroduction);
return true;
}
private boolean onPageDown(KeyboardEvent event, boolean briefIntroduction) {
if (noContentCheck()) return true;
if (hotPointY >= items.length) {
luwrain.hint(Hints.NO_ITEMS_BELOW);
return true;
}
final int visibleHeight = luwrain.getAreaVisibleHeight(this);
if (visibleHeight < 1) return false;
hotPointY += visibleHeight;
if (hotPointY > items.length) hotPointY = items.length;
onNewHotPointY(briefIntroduction);
return true;
}