package com.jakewharton.rxbinding2.view;
import android.view.View;
import android.view.View.OnAttachStateChangeListener;
import io.reactivex.Observable;
import io.reactivex.Observer;
import io.reactivex.android.MainThreadDisposable;
import static com.jakewharton.rxbinding2.internal.Preconditions.checkMainThread;
final class ViewAttachEventObservable extends Observable<ViewAttachEvent> {
private final View view;
ViewAttachEventObservable(View view) {
this.view = view;
}
@Override protected void subscribeActual(Observer<? super ViewAttachEvent> observer) {
if (!checkMainThread(observer)) {
return;
}
Listener listener = new Listener(view, observer);
observer.onSubscribe(listener);
view.addOnAttachStateChangeListener(listener);
}
static final class Listener extends MainThreadDisposable implements OnAttachStateChangeListener {
private final View view;
private final Observer<? super ViewAttachEvent> observer;
Listener(View view, Observer<? super ViewAttachEvent> observer) {
this.view = view;
this.observer = observer;
}
@Override public void onViewAttachedToWindow(View v) {
if (!isDisposed()) {
observer.onNext(ViewAttachAttachedEvent.create(view));
}
}
@Override public void onViewDetachedFromWindow(View v) {
if (!isDisposed()) {
observer.onNext(ViewAttachDetachedEvent.create(view));
}
}
@Override protected void onDispose() {
view.removeOnAttachStateChangeListener(this);
}
}
}