OnItemVisibilityChangedDelegateImpl.java
/*
* Copyright 2020 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package androidx.car.app.model;
import static androidx.annotation.RestrictTo.Scope.LIBRARY;
import static java.util.Objects.requireNonNull;
import android.annotation.SuppressLint;
import android.os.RemoteException;
import androidx.annotation.Keep;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.annotation.RestrictTo;
import androidx.car.app.IOnDoneCallback;
import androidx.car.app.OnDoneCallback;
import androidx.car.app.annotations.CarProtocol;
import androidx.car.app.model.ItemList.OnItemVisibilityChangedListener;
import androidx.car.app.utils.RemoteUtils;
/**
* Implementation class for {@link OnItemVisibilityChangedDelegate}.
*
* @hide
*/
@RestrictTo(LIBRARY)
@CarProtocol
public class OnItemVisibilityChangedDelegateImpl implements
OnItemVisibilityChangedDelegate {
@Keep
@Nullable
private final IOnItemVisibilityChangedListener mStub;
@Override
public void sendItemVisibilityChanged(int startIndex, int rightIndex,
@NonNull OnDoneCallback callback) {
try {
requireNonNull(mStub).onItemVisibilityChanged(startIndex, rightIndex,
RemoteUtils.createOnDoneCallbackStub(callback));
} catch (RemoteException e) {
throw new RuntimeException(e);
}
}
private OnItemVisibilityChangedDelegateImpl(
@NonNull OnItemVisibilityChangedListener listener) {
mStub = new OnItemVisibilityChangedListenerStub(listener);
}
/** For serialization. */
private OnItemVisibilityChangedDelegateImpl() {
mStub = null;
}
@NonNull
// This listener relates to UI event and is expected to be triggered on the main thread.
@SuppressLint("ExecutorRegistration")
static OnItemVisibilityChangedDelegate create(
@NonNull OnItemVisibilityChangedListener listener) {
return new OnItemVisibilityChangedDelegateImpl(listener);
}
/** Stub class for the {@link IOnItemVisibilityChangedListener} interface. */
@Keep // We need to keep these stub for Bundler serialization logic.
private static class OnItemVisibilityChangedListenerStub
extends IOnItemVisibilityChangedListener.Stub {
private final OnItemVisibilityChangedListener mListener;
OnItemVisibilityChangedListenerStub(
OnItemVisibilityChangedListener listener) {
mListener = listener;
}
@Override
public void onItemVisibilityChanged(
int startIndexInclusive, int endIndexExclusive, IOnDoneCallback callback) {
RemoteUtils.dispatchCallFromHost(
callback, "onItemVisibilityChanged", () -> {
mListener.onItemVisibilityChanged(
startIndexInclusive, endIndexExclusive);
return null;
}
);
}
}
}