public void tick(double dt) throws InterruptedException {
Widget next;
for (Widget wdg = child; wdg != null; wdg = next) {
next = wdg.next;
wdg.tick(dt);
}
/* It would be very nice to do these things in harmless mix-in
* classes, but alas, this is Java. */
anims.addAll(nanims);
nanims.clear();
for (Iterator<Anim> i = anims.iterator(); i.hasNext(); ) {
Anim anim = i.next();
if (anim.tick(dt)) i.remove();
}
}
