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 package com.android.settings.display;
15 
16 import static android.content.Intent.ACTION_SHOW_BRIGHTNESS_DIALOG;
17 
18 import static com.android.settingslib.display.BrightnessUtils.GAMMA_SPACE_MAX;
19 import static com.android.settingslib.display.BrightnessUtils.GAMMA_SPACE_MIN;
20 import static com.android.settingslib.display.BrightnessUtils.convertLinearToGammaFloat;
21 
22 import android.content.ContentResolver;
23 import android.content.Context;
24 import android.content.Intent;
25 import android.database.ContentObserver;
26 import android.hardware.display.BrightnessInfo;
27 import android.hardware.display.DisplayManager;
28 import android.hardware.display.DisplayManager.DisplayListener;
29 import android.net.Uri;
30 import android.os.Handler;
31 import android.os.Looper;
32 import android.os.PowerManager;
33 import android.os.RemoteException;
34 import android.os.ServiceManager;
35 import android.provider.Settings.System;
36 import android.service.vr.IVrManager;
37 import android.text.TextUtils;
38 import android.util.Log;
39 
40 import androidx.annotation.VisibleForTesting;
41 import androidx.preference.Preference;
42 import androidx.preference.PreferenceScreen;
43 
44 import com.android.settings.core.PreferenceControllerMixin;
45 import com.android.settings.core.SettingsBaseActivity;
46 import com.android.settingslib.core.AbstractPreferenceController;
47 import com.android.settingslib.core.lifecycle.Lifecycle;
48 import com.android.settingslib.core.lifecycle.LifecycleObserver;
49 import com.android.settingslib.core.lifecycle.events.OnStart;
50 import com.android.settingslib.core.lifecycle.events.OnStop;
51 import com.android.settingslib.transition.SettingsTransitionHelper;
52 
53 import java.text.NumberFormat;
54 
55 public class BrightnessLevelPreferenceController extends AbstractPreferenceController implements
56         PreferenceControllerMixin, LifecycleObserver, OnStart, OnStop {
57 
58     private static final String TAG = "BrightnessPrefCtrl";
59     private static final String KEY_BRIGHTNESS = "brightness";
60     private static final Uri BRIGHTNESS_FOR_VR_URI;
61     private static final Uri BRIGHTNESS_ADJ_URI;
62 
63     private final float mMinVrBrightness;
64     private final float mMaxVrBrightness;
65     private final ContentResolver mContentResolver;
66     private final Handler mHandler = new Handler(Looper.getMainLooper());
67     private final DisplayManager mDisplayManager;
68 
69     private Preference mPreference;
70 
71     static {
72         BRIGHTNESS_FOR_VR_URI = System.getUriFor(System.SCREEN_BRIGHTNESS_FOR_VR);
73         BRIGHTNESS_ADJ_URI = System.getUriFor(System.SCREEN_AUTO_BRIGHTNESS_ADJ);
74     }
75 
76     private ContentObserver mBrightnessObserver =
77             new ContentObserver(mHandler) {
78                 @Override
79                 public void onChange(boolean selfChange) {
80                     updatedSummary(mPreference);
81                 }
82             };
83 
84     private final DisplayListener mDisplayListener = new DisplayListener() {
85         @Override
86         public void onDisplayAdded(int displayId) {
87         }
88 
89         @Override
90         public void onDisplayRemoved(int displayId) {
91         }
92 
93         @Override
94         public void onDisplayChanged(int displayId) {
95             updatedSummary(mPreference);
96         }
97     };
98 
99 
BrightnessLevelPreferenceController(Context context, Lifecycle lifecycle)100     public BrightnessLevelPreferenceController(Context context, Lifecycle lifecycle) {
101         super(context);
102         mDisplayManager = context.getSystemService(DisplayManager.class);
103 
104         if (lifecycle != null) {
105             lifecycle.addObserver(this);
106         }
107         final PowerManager powerManager = context.getSystemService(PowerManager.class);
108 
109         mMinVrBrightness = powerManager.getBrightnessConstraint(
110                 PowerManager.BRIGHTNESS_CONSTRAINT_TYPE_MINIMUM_VR);
111         mMaxVrBrightness = powerManager.getBrightnessConstraint(
112                 PowerManager.BRIGHTNESS_CONSTRAINT_TYPE_MAXIMUM_VR);
113         mContentResolver = mContext.getContentResolver();
114     }
115 
116     @Override
isAvailable()117     public boolean isAvailable() {
118         return true;
119     }
120 
121     @Override
getPreferenceKey()122     public String getPreferenceKey() {
123         return KEY_BRIGHTNESS;
124     }
125 
126     @Override
displayPreference(PreferenceScreen screen)127     public void displayPreference(PreferenceScreen screen) {
128         super.displayPreference(screen);
129         mPreference = screen.findPreference(KEY_BRIGHTNESS);
130     }
131 
132     @Override
updateState(Preference preference)133     public void updateState(Preference preference) {
134         updatedSummary(preference);
135     }
136 
137     @Override
onStart()138     public void onStart() {
139         mContentResolver.registerContentObserver(BRIGHTNESS_FOR_VR_URI, false, mBrightnessObserver);
140         mContentResolver.registerContentObserver(BRIGHTNESS_ADJ_URI, false, mBrightnessObserver);
141         mDisplayManager.registerDisplayListener(mDisplayListener, mHandler,
142                 DisplayManager.EVENT_FLAG_DISPLAY_BRIGHTNESS);
143     }
144 
145     @Override
onStop()146     public void onStop() {
147         mContentResolver.unregisterContentObserver(mBrightnessObserver);
148         mDisplayManager.unregisterDisplayListener(mDisplayListener);
149     }
150 
151     @Override
handlePreferenceTreeClick(Preference preference)152     public boolean handlePreferenceTreeClick(Preference preference) {
153         if (!TextUtils.equals(preference.getKey(), getPreferenceKey())) {
154             return false;
155         }
156         final Intent intent = new Intent(ACTION_SHOW_BRIGHTNESS_DIALOG);
157         intent.putExtra(SettingsBaseActivity.EXTRA_PAGE_TRANSITION_TYPE,
158                 SettingsTransitionHelper.TransitionType.TRANSITION_NONE);
159         mContext.startActivity(intent);
160         return true;
161     }
162 
updatedSummary(Preference preference)163     private void updatedSummary(Preference preference) {
164         if (preference != null) {
165             preference.setSummary(NumberFormat.getPercentInstance().format(getCurrentBrightness()));
166         }
167     }
168 
getCurrentBrightness()169     private double getCurrentBrightness() {
170         int value = 0;
171         if (isInVrMode()) {
172             value = convertLinearToGammaFloat(System.getFloat(mContentResolver,
173                     System.SCREEN_BRIGHTNESS_FOR_VR_FLOAT, mMaxVrBrightness),
174                     mMinVrBrightness, mMaxVrBrightness);
175         } else {
176             final BrightnessInfo info = mContext.getDisplay().getBrightnessInfo();
177             if (info != null) {
178                 value = convertLinearToGammaFloat(info.brightness, info.brightnessMinimum,
179                         info.brightnessMaximum);
180             }
181         }
182         return getPercentage(value, GAMMA_SPACE_MIN, GAMMA_SPACE_MAX);
183     }
184 
getPercentage(double value, int min, int max)185     private double getPercentage(double value, int min, int max) {
186         if (value > max) {
187             return 1.0;
188         }
189         if (value < min) {
190             return 0.0;
191         }
192         return (value - min) / (max - min);
193     }
194 
195     @VisibleForTesting
safeGetVrManager()196     IVrManager safeGetVrManager() {
197         return IVrManager.Stub.asInterface(ServiceManager.getService(
198                 Context.VR_SERVICE));
199     }
200 
201     @VisibleForTesting
isInVrMode()202     boolean isInVrMode() {
203         IVrManager vrManager = safeGetVrManager();
204         if (vrManager != null) {
205             try {
206                 return vrManager.getVrModeState();
207             } catch (RemoteException e) {
208                 Log.e(TAG, "Failed to check vr mode!", e);
209             }
210         }
211         return false;
212     }
213 }
214