package com.jakewharton.rxbinding2.support.v7.widget;
import android.support.v7.widget.RecyclerView;
import io.reactivex.Observable;
import io.reactivex.Observer;
import io.reactivex.android.MainThreadDisposable;
import static com.jakewharton.rxbinding2.internal.Preconditions.checkMainThread;
final class RecyclerViewScrollEventObservable extends Observable<RecyclerViewScrollEvent> {
private final RecyclerView view;
RecyclerViewScrollEventObservable(RecyclerView view) {
this.view = view;
}
@Override protected void subscribeActual(Observer<? super RecyclerViewScrollEvent> observer) {
if (!checkMainThread(observer)) {
return;
}
Listener listener = new Listener(view, observer);
observer.onSubscribe(listener);
view.addOnScrollListener(listener.scrollListener);
}
final class Listener extends MainThreadDisposable {
private final RecyclerView recyclerView;
final RecyclerView.OnScrollListener scrollListener;
Listener(RecyclerView recyclerView, final Observer<? super RecyclerViewScrollEvent> observer) {
this.recyclerView = recyclerView;
this.scrollListener = new RecyclerView.OnScrollListener() {
@Override public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
if (!isDisposed()) {
observer.onNext(RecyclerViewScrollEvent.create(recyclerView, dx, dy));
}
}
};
}
@Override protected void onDispose() {
recyclerView.removeOnScrollListener(scrollListener);
}
}
}