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      1 /*
      2  * Copyright (C) 2015 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.internal.policy;
     18 
     19 import android.content.Context;
     20 import android.content.res.AssetManager;
     21 import android.content.res.Resources;
     22 import android.view.ContextThemeWrapper;
     23 import android.view.WindowManager;
     24 import android.view.WindowManagerImpl;
     25 
     26 import java.lang.ref.WeakReference;
     27 
     28 /**
     29  * Context for decor views which can be seeded with pure application context and not depend on the
     30  * activity, but still provide some of the facilities that Activity has,
     31  * e.g. themes, activity-based resources, etc.
     32  *
     33  * @hide
     34  */
     35 class DecorContext extends ContextThemeWrapper {
     36     private PhoneWindow mPhoneWindow;
     37     private WindowManager mWindowManager;
     38     private Resources mActivityResources;
     39 
     40     private WeakReference<Context> mActivityContext;
     41 
     42     public DecorContext(Context context, Context activityContext) {
     43         super(context, null);
     44         mActivityContext = new WeakReference<>(activityContext);
     45         mActivityResources = activityContext.getResources();
     46     }
     47 
     48     void setPhoneWindow(PhoneWindow phoneWindow) {
     49         mPhoneWindow = phoneWindow;
     50         mWindowManager = null;
     51     }
     52 
     53     @Override
     54     public Object getSystemService(String name) {
     55         if (Context.WINDOW_SERVICE.equals(name)) {
     56             if (mWindowManager == null) {
     57                 WindowManagerImpl wm =
     58                         (WindowManagerImpl) super.getSystemService(Context.WINDOW_SERVICE);
     59                 mWindowManager = wm.createLocalWindowManager(mPhoneWindow);
     60             }
     61             return mWindowManager;
     62         }
     63         return super.getSystemService(name);
     64     }
     65 
     66     @Override
     67     public Resources getResources() {
     68         Context activityContext = mActivityContext.get();
     69         // Attempt to update the local cached Resources from the activity context. If the activity
     70         // is no longer around, return the old cached values.
     71         if (activityContext != null) {
     72             mActivityResources = activityContext.getResources();
     73         }
     74 
     75         return mActivityResources;
     76     }
     77 
     78     @Override
     79     public AssetManager getAssets() {
     80         return mActivityResources.getAssets();
     81     }
     82 }
     83