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 androidx.annotation.VisibleForTesting;
40 
41 import com.android.car.settings.R;
42 import com.android.car.settings.common.FragmentController;
43 import com.android.car.settings.common.Logger;
44 import com.android.car.settings.common.PreferenceController;
45 import com.android.car.settings.common.SeekBarPreference;
46 import com.android.car.settings.enterprise.EnterpriseUtils;
47 
48 /** Business logic for changing the brightness of the display. */
49 public class BrightnessLevelPreferenceController extends PreferenceController<SeekBarPreference> {
50 
51     private static final Logger LOG = new Logger(BrightnessLevelPreferenceController.class);
52     private static final Uri BRIGHTNESS_URI = Settings.System.getUriFor(
53             Settings.System.SCREEN_BRIGHTNESS);
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 
63     @VisibleForTesting
64     final int mMaximumBacklight;
65     @VisibleForTesting
66     final int mMinimumBacklight;
67 
BrightnessLevelPreferenceController(Context context, String preferenceKey, FragmentController fragmentController, CarUxRestrictions uxRestrictions)68     public BrightnessLevelPreferenceController(Context context, String preferenceKey,
69             FragmentController fragmentController, CarUxRestrictions uxRestrictions) {
70         super(context, preferenceKey, fragmentController, uxRestrictions);
71 
72         PowerManager powerManager = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
73         mMaximumBacklight = powerManager.getMaximumScreenBrightnessSetting();
74         mMinimumBacklight = powerManager.getMinimumScreenBrightnessSetting();
75     }
76 
77     @Override
getPreferenceType()78     protected Class<SeekBarPreference> getPreferenceType() {
79         return SeekBarPreference.class;
80     }
81 
82     @Override
onCreateInternal()83     protected void onCreateInternal() {
84         super.onCreateInternal();
85         setClickableWhileDisabled(getPreference(), /* clickable= */ true, p -> {
86             if (hasUserRestrictionByDpm(getContext(), DISALLOW_CONFIG_BRIGHTNESS)) {
87                 showActionDisabledByAdminDialog();
88             } else {
89                 Toast.makeText(getContext(),
90                         getContext().getString(R.string.action_unavailable),
91                         Toast.LENGTH_LONG).show();
92             }
93         });
94     }
95 
96     @Override
onStartInternal()97     protected void onStartInternal() {
98         super.onStartInternal();
99         getContext().getContentResolver().registerContentObserver(BRIGHTNESS_URI,
100                 /* notifyForDescendants= */ false, mBrightnessObserver);
101     }
102 
103     @Override
onStopInternal()104     protected void onStopInternal() {
105         super.onStopInternal();
106         getContext().getContentResolver().unregisterContentObserver(mBrightnessObserver);
107     }
108 
109     @Override
updateState(SeekBarPreference preference)110     protected void updateState(SeekBarPreference preference) {
111         preference.setMax(GAMMA_SPACE_MAX);
112         preference.setValue(getSeekbarValue());
113         preference.setContinuousUpdate(true);
114     }
115 
116     @Override
handlePreferenceChanged(SeekBarPreference preference, Object newValue)117     protected boolean handlePreferenceChanged(SeekBarPreference preference, Object newValue) {
118         int gamma = (Integer) newValue;
119         int linear = convertGammaToLinear(gamma, mMinimumBacklight, mMaximumBacklight);
120         saveScreenBrightnessLinearValue(linear);
121         return true;
122     }
123 
getSeekbarValue()124     private int getSeekbarValue() {
125         int gamma = GAMMA_SPACE_MAX;
126         try {
127             int linear = getScreenBrightnessLinearValue();
128             gamma = convertLinearToGamma(linear, mMinimumBacklight, mMaximumBacklight);
129         } catch (Settings.SettingNotFoundException e) {
130             LOG.w("Can't find setting for SCREEN_BRIGHTNESS.");
131         }
132         return gamma;
133     }
134 
135     @Override
getDefaultAvailabilityStatus()136     public int getDefaultAvailabilityStatus() {
137         if (hasUserRestrictionByUm(getContext(), DISALLOW_CONFIG_BRIGHTNESS)
138                 || hasUserRestrictionByDpm(getContext(), DISALLOW_CONFIG_BRIGHTNESS)) {
139             return AVAILABLE_FOR_VIEWING;
140         }
141         return AVAILABLE;
142     }
143 
showActionDisabledByAdminDialog()144     private void showActionDisabledByAdminDialog() {
145         getFragmentController().showDialog(
146                 EnterpriseUtils.getActionDisabledByAdminDialog(getContext(),
147                         DISALLOW_CONFIG_BRIGHTNESS),
148                 DISABLED_BY_ADMIN_CONFIRM_DIALOG_TAG);
149     }
150 
151     @VisibleForTesting
getScreenBrightnessLinearValue()152     int getScreenBrightnessLinearValue() throws Settings.SettingNotFoundException {
153         return Settings.System.getIntForUser(getContext().getContentResolver(),
154                 Settings.System.SCREEN_BRIGHTNESS, UserHandle.myUserId());
155     }
156 
157     @VisibleForTesting
saveScreenBrightnessLinearValue(int linear)158     void saveScreenBrightnessLinearValue(int linear) {
159         Settings.System.putIntForUser(getContext().getContentResolver(),
160                 Settings.System.SCREEN_BRIGHTNESS, linear, UserHandle.myUserId());
161     }
162 }
163