package com.jakewharton.rxbinding2.support.design.widget;
import android.support.design.widget.CoordinatorLayout.LayoutParams;
import android.support.design.widget.SwipeDismissBehavior;
import android.support.design.widget.SwipeDismissBehavior.OnDismissListener;
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 SwipeDismissBehaviorObservable extends Observable<View> {
private final View view;
SwipeDismissBehaviorObservable(View view) {
this.view = view;
}
@Override protected void subscribeActual(Observer<? super View> observer) {
if (!checkMainThread(observer)) {
return;
}
if (!(view.getLayoutParams() instanceof LayoutParams)) {
throw new IllegalArgumentException("The view is not in a Coordinator Layout.");
}
LayoutParams params = (LayoutParams) view.getLayoutParams();
final SwipeDismissBehavior behavior = (SwipeDismissBehavior) params.getBehavior();
if (behavior == null) {
throw new IllegalStateException("There's no behavior set on this view.");
}
Listener listener = new Listener(behavior, observer);
observer.onSubscribe(listener);
behavior.setListener(listener);
}
static final class Listener extends MainThreadDisposable implements OnDismissListener {
private final SwipeDismissBehavior swipeDismissBehavior;
private final Observer<? super View> observer;
Listener(SwipeDismissBehavior swipeDismissBehavior, Observer<? super View> observer) {
this.swipeDismissBehavior = swipeDismissBehavior;
this.observer = observer;
}
@Override public void onDismiss(View view) {
if (!isDisposed()) {
observer.onNext(view);
}
}
@Override public void onDragStateChanged(int state) {
}
@Override protected void onDispose() {
swipeDismissBehavior.setListener(null);
}
}
}