| /* |
| * 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 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#registerWindowContextListener(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#registerWindowContextListener(IBinder, int, int, |
| * Bundle, boolean)}.<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); |
| } |
| |
| @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(); |
| } |
| } |
| } |