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