1/*
2 * Copyright (C) 2012 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
17package android.service.dreams;
18
19import android.content.ComponentName;
20import android.content.Context;
21import android.content.Intent;
22import android.os.PowerManager;
23import android.os.RemoteException;
24import android.os.ServiceManager;
25import android.os.SystemClock;
26import android.os.UserHandle;
27import android.provider.Settings;
28import android.util.Slog;
29
30/**
31 * Internal helper for launching dreams to ensure consistency between the
32 * <code>UiModeManagerService</code> system service and the <code>Somnambulator</code> activity.
33 *
34 * @hide
35 */
36public final class Sandman {
37    private static final String TAG = "Sandman";
38
39    // The component name of a special dock app that merely launches a dream.
40    // We don't want to launch this app when docked because it causes an unnecessary
41    // activity transition.  We just want to start the dream.
42    private static final ComponentName SOMNAMBULATOR_COMPONENT =
43            new ComponentName("com.android.systemui", "com.android.systemui.Somnambulator");
44
45
46    // The sandman is eternal.  No one instantiates him.
47    private Sandman() {
48    }
49
50    /**
51     * Returns true if the specified dock app intent should be started.
52     * False if we should dream instead, if appropriate.
53     */
54    public static boolean shouldStartDockApp(Context context, Intent intent) {
55        ComponentName name = intent.resolveActivity(context.getPackageManager());
56        return name != null && !name.equals(SOMNAMBULATOR_COMPONENT);
57    }
58
59    /**
60     * Starts a dream manually.
61     */
62    public static void startDreamByUserRequest(Context context) {
63        startDream(context, false);
64    }
65
66    /**
67     * Starts a dream when docked if the system has been configured to do so,
68     * otherwise does nothing.
69     */
70    public static void startDreamWhenDockedIfAppropriate(Context context) {
71        if (!isScreenSaverEnabled(context)
72                || !isScreenSaverActivatedOnDock(context)) {
73            Slog.i(TAG, "Dreams currently disabled for docks.");
74            return;
75        }
76
77        startDream(context, true);
78    }
79
80    private static void startDream(Context context, boolean docked) {
81        try {
82            IDreamManager dreamManagerService = IDreamManager.Stub.asInterface(
83                    ServiceManager.getService(DreamService.DREAM_SERVICE));
84            if (dreamManagerService != null && !dreamManagerService.isDreaming()) {
85                if (docked) {
86                    Slog.i(TAG, "Activating dream while docked.");
87
88                    // Wake up.
89                    // The power manager will wake up the system automatically when it starts
90                    // receiving power from a dock but there is a race between that happening
91                    // and the UI mode manager starting a dream.  We want the system to already
92                    // be awake by the time this happens.  Otherwise the dream may not start.
93                    PowerManager powerManager =
94                            (PowerManager)context.getSystemService(Context.POWER_SERVICE);
95                    powerManager.wakeUp(SystemClock.uptimeMillis(),
96                            "android.service.dreams:DREAM");
97                } else {
98                    Slog.i(TAG, "Activating dream by user request.");
99                }
100
101                // Dream.
102                dreamManagerService.dream();
103            }
104        } catch (RemoteException ex) {
105            Slog.e(TAG, "Could not start dream when docked.", ex);
106        }
107    }
108
109    private static boolean isScreenSaverEnabled(Context context) {
110        int def = context.getResources().getBoolean(
111                com.android.internal.R.bool.config_dreamsEnabledByDefault) ? 1 : 0;
112        return Settings.Secure.getIntForUser(context.getContentResolver(),
113                Settings.Secure.SCREENSAVER_ENABLED, def,
114                UserHandle.USER_CURRENT) != 0;
115    }
116
117    private static boolean isScreenSaverActivatedOnDock(Context context) {
118        int def = context.getResources().getBoolean(
119                com.android.internal.R.bool.config_dreamsActivatedOnDockByDefault) ? 1 : 0;
120        return Settings.Secure.getIntForUser(context.getContentResolver(),
121                Settings.Secure.SCREENSAVER_ACTIVATE_ON_DOCK, def,
122                UserHandle.USER_CURRENT) != 0;
123    }
124}
125