static <E> EventStream<QuasiListChange<? extends E>> quasiChangesOf(ObservableList<E> list) {
if (list instanceof LiveList) {
LiveList<E> lst = (LiveList<E>) list;
return lst.quasiChanges();
} else {
return new EventStreamBase<QuasiListChange<? extends E>>() {
@Override
protected Subscription observeInputs() {
return LiveList.<E>observeQuasiChanges(list, this::emit);
}
};
}
}
static <E> Subscription observeQuasiChanges(
ObservableList<? extends E> list, QuasiChangeObserver<? super E> observer) {
if (list instanceof LiveList) {
LiveList<? extends E> lst = (LiveList<? extends E>) list;
return lst.observeQuasiChanges(observer);
} else {
ListChangeListener<E> listener =
ch -> {
QuasiListChange<? extends E> change = QuasiListChange.from(ch);
observer.onChange(change);
};
list.addListener(listener);
return () -> list.removeListener(listener);
}
}