1 /*
2  * Copyright (C) 2017 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
5  * except in compliance with the License. You may obtain a copy of the License at
6  *
7  *      http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software distributed under the
10  * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
11  * KIND, either express or implied. See the License for the specific language governing
12  * permissions and limitations under the License.
13  */
14 
15 package com.android.systemui;
16 
17 import android.os.RemoteException;
18 import android.util.Log;
19 import android.view.IDockedStackListener;
20 import android.view.WindowManagerGlobal;
21 
22 import java.lang.ref.WeakReference;
23 import java.util.ArrayList;
24 import java.util.function.Consumer;
25 
26 /**
27  * Utility wrapper to listen for whether or not a docked stack exists, to be
28  * used for things like the different overview icon in that mode.
29  */
30 public class DockedStackExistsListener {
31 
32     private static final String TAG = "DockedStackExistsListener";
33 
34     private static ArrayList<WeakReference<Consumer<Boolean>>> sCallbacks = new ArrayList<>();
35     private static boolean mLastExists;
36 
37     static {
38         try {
39             WindowManagerGlobal.getWindowManagerService().registerDockedStackListener(
40                     new IDockedStackListener.Stub() {
41                         @Override
42                         public void onDividerVisibilityChanged(boolean b) throws RemoteException {
43 
44                         }
45 
46                         @Override
47                         public void onDockedStackExistsChanged(boolean exists)
48                                 throws RemoteException {
49                             DockedStackExistsListener.onDockedStackExistsChanged(exists);
50                         }
51 
52                         @Override
53                         public void onDockedStackMinimizedChanged(boolean b, long l, boolean b1)
54                                 throws RemoteException {
55 
56                         }
57 
58                         @Override
59                         public void onAdjustedForImeChanged(boolean b, long l)
60                                 throws RemoteException {
61 
62                         }
63 
64                         @Override
65                         public void onDockSideChanged(int i) throws RemoteException {
66 
67                         }
68                     });
69         } catch (RemoteException e) {
70             Log.e(TAG, "Failed registering docked stack exists listener", e);
71         }
72     }
73 
74 
onDockedStackExistsChanged(boolean exists)75     private static void onDockedStackExistsChanged(boolean exists) {
76         mLastExists = exists;
77         synchronized (sCallbacks) {
78             sCallbacks.removeIf(wf -> {
79                 Consumer<Boolean> l = wf.get();
80                 if (l != null) l.accept(exists);
81                 return l == null;
82             });
83         }
84     }
85 
register(Consumer<Boolean> callback)86     public static void register(Consumer<Boolean> callback) {
87         callback.accept(mLastExists);
88         synchronized (sCallbacks) {
89             sCallbacks.add(new WeakReference<>(callback));
90         }
91     }
92 }
93