package com.jakewharton.rxbinding2.support.v7.widget; import android.support.v7.widget.RecyclerView; import android.support.v7.widget.RecyclerView.OnChildAttachStateChangeListener; import android.view.View; import io.reactivex.Observable; import io.reactivex.Observer; import io.reactivex.android.MainThreadDisposable; import static com.jakewharton.rxbinding2.internal.Preconditions.checkMainThread; final class RecyclerViewChildAttachStateChangeEventObservable extends Observable<RecyclerViewChildAttachStateChangeEvent> { private final RecyclerView view; RecyclerViewChildAttachStateChangeEventObservable(RecyclerView recyclerView) { this.view = recyclerView; } @Override protected void subscribeActual( Observer<? super RecyclerViewChildAttachStateChangeEvent> observer) { if (!checkMainThread(observer)) { return; } Listener listener = new Listener(view, observer); observer.onSubscribe(listener); view.addOnChildAttachStateChangeListener(listener); } final class Listener extends MainThreadDisposable implements OnChildAttachStateChangeListener { private final RecyclerView recyclerView; private final Observer<? super RecyclerViewChildAttachStateChangeEvent> observer; Listener(RecyclerView recyclerView, Observer<? super RecyclerViewChildAttachStateChangeEvent> observer) { this.recyclerView = recyclerView; this.observer = observer; } @Override public void onChildViewAttachedToWindow(View childView) { if (!isDisposed()) { observer.onNext(RecyclerViewChildAttachEvent.create(recyclerView, childView)); } } @Override public void onChildViewDetachedFromWindow(View childView) { if (!isDisposed()) { observer.onNext(RecyclerViewChildDetachEvent.create(recyclerView, childView)); } } @Override protected void onDispose() { recyclerView.removeOnChildAttachStateChangeListener(this); } } }