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      1 /*
      2  * Copyright (C) 2016 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.server.wm;
     18 
     19 import android.content.res.Configuration;
     20 
     21 /**
     22  * Class that allows the owner/creator of a {@link WindowContainer} to communicate directly with the
     23  * container and make changes.
     24  * Note that public calls (mostly in sub-classes) into this class are assumed to be originating from
     25  * outside the window manager so the window manager lock is held and appropriate permissions are
     26  * checked before calls are allowed to proceed.
     27  *
     28  * Test class: {@link WindowContainerControllerTests}
     29  */
     30 class WindowContainerController<E extends WindowContainer, I extends WindowContainerListener>
     31         implements ConfigurationContainerListener {
     32 
     33     final WindowManagerService mService;
     34     final RootWindowContainer mRoot;
     35     final WindowHashMap mWindowMap;
     36 
     37     // The window container this controller owns.
     38     E mContainer;
     39     // Interface for communicating changes back to the owner.
     40     final I mListener;
     41 
     42     WindowContainerController(I listener, WindowManagerService service) {
     43         mListener = listener;
     44         mService = service;
     45         mRoot = mService != null ? mService.mRoot : null;
     46         mWindowMap = mService != null ? mService.mWindowMap : null;
     47     }
     48 
     49     void setContainer(E container) {
     50         if (mContainer != null && container != null) {
     51             throw new IllegalArgumentException("Can't set container=" + container
     52                     + " for controller=" + this + " Already set to=" + mContainer);
     53         }
     54         mContainer = container;
     55         if (mContainer != null && mListener != null) {
     56             mListener.registerConfigurationChangeListener(this);
     57         }
     58     }
     59 
     60     void removeContainer() {
     61         // TODO: See if most uses cases should support removeIfPossible here.
     62         //mContainer.removeIfPossible();
     63         if (mContainer == null) {
     64             return;
     65         }
     66 
     67         mContainer.setController(null);
     68         mContainer = null;
     69         if (mListener != null) {
     70             mListener.unregisterConfigurationChangeListener(this);
     71         }
     72     }
     73 
     74     @Override
     75     public void onOverrideConfigurationChanged(Configuration overrideConfiguration) {
     76         synchronized (mWindowMap) {
     77             if (mContainer == null) {
     78                 return;
     79             }
     80             mContainer.onOverrideConfigurationChanged(overrideConfiguration);
     81         }
     82     }
     83 }
     84