package com.jakewharton.rxbinding2.widget;
import android.widget.AbsListView;
import io.reactivex.Observable;
import io.reactivex.Observer;
import io.reactivex.android.MainThreadDisposable;
import static com.jakewharton.rxbinding2.internal.Preconditions.checkMainThread;
final class AbsListViewScrollEventObservable extends Observable<AbsListViewScrollEvent> {
private final AbsListView view;
AbsListViewScrollEventObservable(AbsListView view) {
this.view = view;
}
@Override protected void subscribeActual(Observer<? super AbsListViewScrollEvent> observer) {
if (!checkMainThread(observer)) {
return;
}
Listener listener = new Listener(view, observer);
observer.onSubscribe(listener);
view.setOnScrollListener(listener);
}
static final class Listener extends MainThreadDisposable implements AbsListView.OnScrollListener {
private final AbsListView view;
private final Observer<? super AbsListViewScrollEvent> observer;
private int currentScrollState = SCROLL_STATE_IDLE;
Listener(AbsListView view, Observer<? super AbsListViewScrollEvent> observer) {
this.view = view;
this.observer = observer;
}
@Override public void onScrollStateChanged(AbsListView absListView, int scrollState) {
currentScrollState = scrollState;
if (!isDisposed()) {
AbsListViewScrollEvent event =
AbsListViewScrollEvent.create(view, scrollState, view.getFirstVisiblePosition(),
view.getChildCount(), view.getCount());
observer.onNext(event);
}
}
@Override
public void onScroll(AbsListView absListView, int firstVisibleItem, int visibleItemCount,
int totalItemCount) {
if (!isDisposed()) {
AbsListViewScrollEvent event =
AbsListViewScrollEvent.create(view, currentScrollState, firstVisibleItem,
visibleItemCount, totalItemCount);
observer.onNext(event);
}
}
@Override protected void onDispose() {
view.setOnScrollListener(null);
}
}
}