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    private static boolean mLastExists;
37
38    static {
39        try {
40            WindowManagerGlobal.getWindowManagerService().registerDockedStackListener(
41                    new IDockedStackListener.Stub() {
42                        @Override
43                        public void onDividerVisibilityChanged(boolean b) throws RemoteException {
44
45                        }
46
47                        @Override
48                        public void onDockedStackExistsChanged(boolean exists)
49                                throws RemoteException {
50                            DockedStackExistsListener.onDockedStackExistsChanged(exists);
51                        }
52
53                        @Override
54                        public void onDockedStackMinimizedChanged(boolean b, long l, boolean b1)
55                                throws RemoteException {
56
57                        }
58
59                        @Override
60                        public void onAdjustedForImeChanged(boolean b, long l)
61                                throws RemoteException {
62
63                        }
64
65                        @Override
66                        public void onDockSideChanged(int i) throws RemoteException {
67
68                        }
69                    });
70        } catch (RemoteException e) {
71            Log.e(TAG, "Failed registering docked stack exists listener", e);
72        }
73    }
74
75
76    private static void onDockedStackExistsChanged(boolean exists) {
77        mLastExists = exists;
78        synchronized (sCallbacks) {
79            sCallbacks.removeIf(wf -> {
80                Consumer<Boolean> l = wf.get();
81                if (l != null) l.accept(exists);
82                return l == null;
83            });
84        }
85    }
86
87    public static void register(Consumer<Boolean> callback) {
88        callback.accept(mLastExists);
89        synchronized (sCallbacks) {
90            sCallbacks.add(new WeakReference<>(callback));
91        }
92    }
93}
94