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.car.settings.display;
18 
19 import static android.os.UserManager.DISALLOW_CONFIG_BRIGHTNESS;
20 
21 import static com.android.car.settings.enterprise.ActionDisabledByAdminDialogFragment.DISABLED_BY_ADMIN_CONFIRM_DIALOG_TAG;
22 import static com.android.car.settings.enterprise.EnterpriseUtils.hasUserRestrictionByDpm;
23 import static com.android.car.settings.enterprise.EnterpriseUtils.hasUserRestrictionByUm;
24 import static com.android.settingslib.display.BrightnessUtils.GAMMA_SPACE_MAX;
25 import static com.android.settingslib.display.BrightnessUtils.convertGammaToLinear;
26 import static com.android.settingslib.display.BrightnessUtils.convertLinearToGamma;
27 
28 import android.car.drivingstate.CarUxRestrictions;
29 import android.content.Context;
30 import android.database.ContentObserver;
31 import android.net.Uri;
32 import android.os.Handler;
33 import android.os.Looper;
34 import android.os.PowerManager;
35 import android.os.UserHandle;
36 import android.provider.Settings;
37 import android.widget.Toast;
38 
39 import com.android.car.settings.R;
40 import com.android.car.settings.common.FragmentController;
41 import com.android.car.settings.common.Logger;
42 import com.android.car.settings.common.PreferenceController;
43 import com.android.car.settings.common.SeekBarPreference;
44 import com.android.car.settings.enterprise.EnterpriseUtils;
45 
46 /** Business logic for changing the brightness of the display. */
47 public class BrightnessLevelPreferenceController extends PreferenceController<SeekBarPreference> {
48 
49     private static final Logger LOG = new Logger(BrightnessLevelPreferenceController.class);
50     private static final Uri BRIGHTNESS_URI = Settings.System.getUriFor(
51             Settings.System.SCREEN_BRIGHTNESS);
52     private final int mMaximumBacklight;
53     private final int mMinimumBacklight;
54     private final Handler mHandler = new Handler(Looper.getMainLooper());
55 
56     private final ContentObserver mBrightnessObserver = new ContentObserver(mHandler) {
57         @Override
58         public void onChange(boolean selfChange) {
59             refreshUi();
60         }
61     };
62 
BrightnessLevelPreferenceController(Context context, String preferenceKey, FragmentController fragmentController, CarUxRestrictions uxRestrictions)63     public BrightnessLevelPreferenceController(Context context, String preferenceKey,
64             FragmentController fragmentController, CarUxRestrictions uxRestrictions) {
65         super(context, preferenceKey, fragmentController, uxRestrictions);
66 
67         PowerManager powerManager = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
68         mMaximumBacklight = powerManager.getMaximumScreenBrightnessSetting();
69         mMinimumBacklight = powerManager.getMinimumScreenBrightnessSetting();
70     }
71 
72     @Override
getPreferenceType()73     protected Class<SeekBarPreference> getPreferenceType() {
74         return SeekBarPreference.class;
75     }
76 
77     @Override
onCreateInternal()78     protected void onCreateInternal() {
79         super.onCreateInternal();
80         setClickableWhileDisabled(getPreference(), /* clickable= */ true, p -> {
81             if (hasUserRestrictionByDpm(getContext(), DISALLOW_CONFIG_BRIGHTNESS)) {
82                 showActionDisabledByAdminDialog();
83             } else {
84                 Toast.makeText(getContext(),
85                         getContext().getString(R.string.action_unavailable),
86                         Toast.LENGTH_LONG).show();
87             }
88         });
89     }
90 
91     @Override
onStartInternal()92     protected void onStartInternal() {
93         super.onStartInternal();
94         getContext().getContentResolver().registerContentObserver(BRIGHTNESS_URI,
95                 /* notifyForDescendants= */ false, mBrightnessObserver);
96     }
97 
98     @Override
onStopInternal()99     protected void onStopInternal() {
100         super.onStopInternal();
101         getContext().getContentResolver().unregisterContentObserver(mBrightnessObserver);
102     }
103 
104     @Override
updateState(SeekBarPreference preference)105     protected void updateState(SeekBarPreference preference) {
106         preference.setMax(GAMMA_SPACE_MAX);
107         preference.setValue(getSeekbarValue());
108         preference.setContinuousUpdate(true);
109     }
110 
111     @Override
handlePreferenceChanged(SeekBarPreference preference, Object newValue)112     protected boolean handlePreferenceChanged(SeekBarPreference preference, Object newValue) {
113         int gamma = (Integer) newValue;
114         int linear = convertGammaToLinear(gamma, mMinimumBacklight, mMaximumBacklight);
115         Settings.System.putIntForUser(getContext().getContentResolver(),
116                 Settings.System.SCREEN_BRIGHTNESS, linear, UserHandle.myUserId());
117         return true;
118     }
119 
getSeekbarValue()120     private int getSeekbarValue() {
121         int gamma = GAMMA_SPACE_MAX;
122         try {
123             int linear = Settings.System.getIntForUser(getContext().getContentResolver(),
124                     Settings.System.SCREEN_BRIGHTNESS, UserHandle.myUserId());
125             gamma = convertLinearToGamma(linear, mMinimumBacklight, mMaximumBacklight);
126         } catch (Settings.SettingNotFoundException e) {
127             LOG.w("Can't find setting for SCREEN_BRIGHTNESS.");
128         }
129         return gamma;
130     }
131 
132     @Override
getAvailabilityStatus()133     public int getAvailabilityStatus() {
134         if (hasUserRestrictionByUm(getContext(), DISALLOW_CONFIG_BRIGHTNESS)
135                 || hasUserRestrictionByDpm(getContext(), DISALLOW_CONFIG_BRIGHTNESS)) {
136             return AVAILABLE_FOR_VIEWING;
137         }
138         return AVAILABLE;
139     }
140 
showActionDisabledByAdminDialog()141     private void showActionDisabledByAdminDialog() {
142         getFragmentController().showDialog(
143                 EnterpriseUtils.getActionDisabledByAdminDialog(getContext(),
144                         DISALLOW_CONFIG_BRIGHTNESS),
145                 DISABLED_BY_ADMIN_CONFIRM_DIALOG_TAG);
146     }
147 }
148