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/*
* Copyright (C) 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 android.window;
import android.annotation.NonNull;
import android.app.ActivityThread;
import android.app.IWindowToken;
import android.app.ResourcesManager;
import android.content.Context;
import android.content.res.Configuration;
import android.os.Bundle;
import android.os.IBinder;
import com.android.internal.annotations.VisibleForTesting;
import java.lang.ref.WeakReference;
/**
* This class is used to receive {@link Configuration} changes from the associated window manager
* node on the server side, and apply the change to the {@link Context#getResources() associated
* Resources} of the attached {@link Context}. It is also used as
* {@link Context#getWindowContextToken() the token of non-Activity UI Contexts}.
*
* @see WindowContext
* @see android.view.IWindowManager#attachWindowContextToDisplayArea(IBinder, int, int, Bundle)
*
* @hide
*/
public class WindowTokenClient extends IWindowToken.Stub {
/**
* Attached {@link Context} for this window token to update configuration and resources.
* Initialized by {@link #attachContext(Context)}.
*/
private WeakReference<Context> mContextRef = null;
private final ResourcesManager mResourcesManager = ResourcesManager.getInstance();
/**
* Attaches {@code context} to this {@link WindowTokenClient}. Each {@link WindowTokenClient}
* can only attach one {@link Context}.
* <p>This method must be called before invoking
* {@link android.view.IWindowManager#attachWindowContextToDisplayArea(IBinder, int, int,
* Bundle)}.<p/>
*
* @param context context to be attached
* @throws IllegalStateException if attached context has already existed.
*/
public void attachContext(@NonNull Context context) {
if (mContextRef != null) {
throw new IllegalStateException("Context is already attached.");
}
mContextRef = new WeakReference<>(context);
}
/**
* Called when {@link Configuration} updates from the server side receive.
*
* @param newConfig the updated {@link Configuration}
* @param newDisplayId the updated {@link android.view.Display} ID
*/
@VisibleForTesting
@Override
public void onConfigurationChanged(Configuration newConfig, int newDisplayId) {
final Context context = mContextRef.get();
if (context == null) {
return;
}
final int currentDisplayId = context.getDisplayId();
final boolean displayChanged = newDisplayId != currentDisplayId;
final Configuration config = context.getResources().getConfiguration();
final boolean configChanged = config.diff(newConfig) != 0;
if (displayChanged || configChanged) {
// TODO(ag/9789103): update resource manager logic to track non-activity tokens
mResourcesManager.updateResourcesForActivity(this, newConfig, newDisplayId);
if (context instanceof WindowContext) {
ActivityThread.currentActivityThread().getHandler().post(
() -> ((WindowContext) context).dispatchConfigurationChanged(newConfig));
}
}
if (displayChanged) {
context.updateDisplay(newDisplayId);
}
}
@Override
public void onWindowTokenRemoved() {
final Context context = mContextRef.get();
if (context != null) {
context.destroy();
mContextRef.clear();
}
}
}
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