DockedStackExistsListener.java revision 3b9357f3b9d6f2dae175ad1b92116e17b6df1493 
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
15package com.android.systemui;
16
17import android.os.IBinder;
18import android.os.RemoteException;
19import android.util.Log;
20import android.view.IDockedStackListener;
21import android.view.WindowManagerGlobal;
22
23import java.lang.ref.WeakReference;
24import java.util.ArrayList;
25import java.util.function.Consumer;
26
27/**
28 * Utility wrapper to listen for whether or not a docked stack exists, to be
29 * used for things like the different overview icon in that mode.
30 */
31public class DockedStackExistsListener {
32
33    private static final String TAG = "DockedStackExistsListener";
34
35    private static ArrayList<WeakReference<Consumer<Boolean>>> sCallbacks = new ArrayList<>();
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
75    private static void onDockedStackExistsChanged(boolean exists) {
76        synchronized (sCallbacks) {
77            sCallbacks.removeIf(wf -> wf.get() == null);
78            sCallbacks.forEach(wf -> wf.get().accept(exists));
79        }
80    }
81
82    public static void register(Consumer<Boolean> callback) {
83        synchronized (sCallbacks) {
84            sCallbacks.add(new WeakReference<>(callback));
85        }
86    }
87}
88