1 /*
2  * Copyright (C) 2018 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.settings.display;
18 
19 import android.app.UiModeManager;
20 import android.content.BroadcastReceiver;
21 import android.content.Context;
22 import android.content.Intent;
23 import android.content.IntentFilter;
24 import android.content.res.Configuration;
25 import android.os.PowerManager;
26 
27 import androidx.annotation.VisibleForTesting;
28 import androidx.preference.Preference;
29 import androidx.preference.PreferenceScreen;
30 
31 import com.android.settings.R;
32 import com.android.settings.core.TogglePreferenceController;
33 import com.android.settingslib.core.lifecycle.LifecycleObserver;
34 import com.android.settingslib.core.lifecycle.events.OnStart;
35 import com.android.settingslib.core.lifecycle.events.OnStop;
36 
37 public class DarkUIPreferenceController extends TogglePreferenceController implements
38         LifecycleObserver, OnStart, OnStop {
39 
40     public static final String PREF_DARK_MODE_DIALOG_SEEN = "dark_mode_dialog_seen";
41     public static final int DIALOG_SEEN = 1;
42 
43     @VisibleForTesting
44     Preference mPreference;
45 
46     private UiModeManager mUiModeManager;
47     private PowerManager mPowerManager;
48 
49     private BroadcastReceiver mReceiver = new BroadcastReceiver() {
50         @Override
51         public void onReceive(Context context, Intent intent) {
52             updateEnabledStateIfNeeded();
53         }
54     };
55 
DarkUIPreferenceController(Context context, String key)56     public DarkUIPreferenceController(Context context, String key) {
57         super(context, key);
58         mUiModeManager = context.getSystemService(UiModeManager.class);
59         mPowerManager = context.getSystemService(PowerManager.class);
60     }
61 
62     @Override
isChecked()63     public boolean isChecked() {
64          return (mContext.getResources().getConfiguration().uiMode
65                  & Configuration.UI_MODE_NIGHT_YES) != 0;
66     }
67 
68     @Override
displayPreference(PreferenceScreen screen)69     public void displayPreference(PreferenceScreen screen) {
70         super.displayPreference(screen);
71         mPreference = screen.findPreference(getPreferenceKey());
72     }
73 
74     @Override
updateState(Preference preference)75     public void updateState(Preference preference) {
76         super.updateState(preference);
77         updateEnabledStateIfNeeded();
78     }
79 
80     @Override
setChecked(boolean isChecked)81     public boolean setChecked(boolean isChecked) {
82         return mUiModeManager.setNightModeActivated(isChecked);
83     }
84 
85     @Override
getSliceHighlightMenuRes()86     public int getSliceHighlightMenuRes() {
87         return R.string.menu_key_display;
88     }
89 
90     @VisibleForTesting
updateEnabledStateIfNeeded()91     void updateEnabledStateIfNeeded() {
92         if (mPreference == null) {
93             return;
94         }
95         boolean isBatterySaver = isPowerSaveMode();
96         mPreference.setEnabled(!isBatterySaver);
97         if (isBatterySaver) {
98             int stringId = isChecked()
99                     ? R.string.dark_ui_mode_disabled_summary_dark_theme_on
100                     : R.string.dark_ui_mode_disabled_summary_dark_theme_off;
101             mPreference.setSummary(mContext.getString(stringId));
102         }
103     }
104 
105     @VisibleForTesting
isPowerSaveMode()106     boolean isPowerSaveMode() {
107         return mPowerManager.isPowerSaveMode();
108     }
109 
110     @Override
onStart()111     public void onStart() {
112         mContext.registerReceiver(mReceiver,
113                 new IntentFilter(PowerManager.ACTION_POWER_SAVE_MODE_CHANGED));
114     }
115 
116     @Override
onStop()117     public void onStop() {
118         mContext.unregisterReceiver(mReceiver);
119     }
120 
121     @Override
getAvailabilityStatus()122     public int getAvailabilityStatus() {
123         return AVAILABLE;
124     }
125 }
126