package com.jakewharton.rxbinding2.support.v4.widget;
import android.support.v4.widget.NestedScrollView;
import android.support.v4.widget.NestedScrollView.OnScrollChangeListener;
import com.jakewharton.rxbinding2.view.ViewScrollChangeEvent;
import io.reactivex.Observable;
import io.reactivex.Observer;
import io.reactivex.android.MainThreadDisposable;
import static com.jakewharton.rxbinding2.internal.Preconditions.checkMainThread;
final class NestedScrollViewScrollChangeEventObservable extends Observable<ViewScrollChangeEvent> {
private final NestedScrollView view;
NestedScrollViewScrollChangeEventObservable(NestedScrollView view) {
this.view = view;
}
@Override protected void subscribeActual(Observer<? super ViewScrollChangeEvent> observer) {
if (!checkMainThread(observer)) {
return;
}
Listener listener = new Listener(view, observer);
observer.onSubscribe(listener);
view.setOnScrollChangeListener(listener);
}
static final class Listener extends MainThreadDisposable implements OnScrollChangeListener {
private final NestedScrollView view;
private final Observer<? super ViewScrollChangeEvent> observer;
Listener(NestedScrollView view, Observer<? super ViewScrollChangeEvent> observer) {
this.view = view;
this.observer = observer;
}
@Override
public void onScrollChange(NestedScrollView v, int scrollX, int scrollY, int oldScrollX,
int oldScrollY) {
if (!isDisposed()) {
observer.onNext(
ViewScrollChangeEvent.create(view, scrollX, scrollY, oldScrollX, oldScrollY));
}
}
@Override protected void onDispose() {
view.setOnScrollChangeListener((OnScrollChangeListener) null);
}
}
}