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view holder binding optimized

This commit is contained in:
Gavriil Sitnikov 2016-07-14 06:05:40 +03:00
parent dae7db1a15
commit 627608e148
1 changed files with 14 additions and 2 deletions
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16
src/main/java/ru/touchin/roboswag/components/listing/adapters/BindableViewHolder.java
View File

@ -24,6 +24,8 @@ import android.support.annotation.NonNull;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import java.util.concurrent.TimeUnit;
import ru.touchin.roboswag.components.navigation.UiBindable;
import rx.Observable;
import rx.android.schedulers.AndroidSchedulers;
@ -35,14 +37,24 @@ import rx.subjects.BehaviorSubject;
*/
public class BindableViewHolder extends RecyclerView.ViewHolder implements UiBindable {
// it is needed to delay detach to avoid re-subscriptions on fast scroll
private static final long DETACH_DELAY = TimeUnit.SECONDS.toMillis(1);
@NonNull
private final UiBindable baseBindable;
@NonNull
private final BehaviorSubject<Boolean> attachedToWindowSubject = BehaviorSubject.create();
private final Observable<Boolean> attachedObservable;
public BindableViewHolder(@NonNull final UiBindable baseBindable, @NonNull final View itemView) {
super(itemView);
this.baseBindable = baseBindable;
attachedObservable = attachedToWindowSubject
.switchMap(attached -> attached
? Observable.just(true)
: Observable.timer(DETACH_DELAY, TimeUnit.MILLISECONDS).map(ignored -> false))
.replay(1)
.refCount();
}
@CallSuper
@ -62,7 +74,7 @@ public class BindableViewHolder extends RecyclerView.ViewHolder implements UiBin
@NonNull
@Override
public <T> Observable<T> bind(@NonNull final Observable<T> observable) {
return attachedToWindowSubject
return attachedObservable
.switchMap(isStarted -> isStarted ? observable.observeOn(AndroidSchedulers.mainThread()) : Observable.never());
}
@ -75,6 +87,6 @@ public class BindableViewHolder extends RecyclerView.ViewHolder implements UiBin
@NonNull
@Override
public <T> Observable<T> untilDestroy(@NonNull final Observable<T> observable) {
return baseBindable.untilStop(observable);
return baseBindable.untilDestroy(observable);
}
}