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      1 /*
      2  * Copyright (C) 2017 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.os.RemoteCallbackList;
     20 import android.os.RemoteException;
     21 import android.util.SparseArray;
     22 import android.view.IWallpaperVisibilityListener;
     23 
     24 /**
     25  * Manages and trigger wallpaper visibility listeners.
     26  */
     27 class WallpaperVisibilityListeners {
     28 
     29     /**
     30      * A map of displayIds and its listeners.
     31      */
     32     private final SparseArray<RemoteCallbackList<IWallpaperVisibilityListener>> mDisplayListeners =
     33             new SparseArray<>();
     34 
     35     void registerWallpaperVisibilityListener(IWallpaperVisibilityListener listener,
     36             int displayId) {
     37         RemoteCallbackList<IWallpaperVisibilityListener> listeners =
     38                 mDisplayListeners.get(displayId);
     39         if (listeners == null) {
     40             listeners = new RemoteCallbackList<>();
     41             mDisplayListeners.append(displayId, listeners);
     42         }
     43         listeners.register(listener);
     44     }
     45 
     46     void unregisterWallpaperVisibilityListener(IWallpaperVisibilityListener listener,
     47             int displayId) {
     48         RemoteCallbackList<IWallpaperVisibilityListener> listeners =
     49                 mDisplayListeners.get(displayId);
     50         if (listeners == null) {
     51             return;
     52         }
     53         listeners.unregister(listener);
     54     }
     55 
     56     void notifyWallpaperVisibilityChanged(DisplayContent displayContent) {
     57         final int displayId = displayContent.getDisplayId();
     58         final boolean visible = displayContent.mWallpaperController.isWallpaperVisible();
     59         RemoteCallbackList<IWallpaperVisibilityListener> displayListeners =
     60                 mDisplayListeners.get(displayId);
     61 
     62         // No listeners for this display.
     63         if (displayListeners == null) {
     64             return;
     65         }
     66 
     67         int i = displayListeners.beginBroadcast();
     68         while (i > 0) {
     69             i--;
     70             IWallpaperVisibilityListener listener = displayListeners.getBroadcastItem(i);
     71             try {
     72                 listener.onWallpaperVisibilityChanged(visible, displayId);
     73             } catch (RemoteException e) {
     74                 // Nothing to do in here, RemoteCallbackListener will clean it up.
     75             }
     76         }
     77         displayListeners.finishBroadcast();
     78     }
     79 }
     80