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 import static android.content.Intent.EXTRA_BRIGHTNESS_DIALOG_IS_FULL_WIDTH;
18 
19 import static com.android.settingslib.display.BrightnessUtils.GAMMA_SPACE_MAX;
20 import static com.android.settingslib.display.BrightnessUtils.GAMMA_SPACE_MIN;
21 import static com.android.settingslib.display.BrightnessUtils.convertLinearToGammaFloat;
22 
23 import android.annotation.Nullable;
24 import android.app.ActivityOptions;
25 import android.content.ContentResolver;
26 import android.content.Context;
27 import android.content.Intent;
28 import android.database.ContentObserver;
29 import android.hardware.display.BrightnessInfo;
30 import android.hardware.display.DisplayManager;
31 import android.hardware.display.DisplayManager.DisplayListener;
32 import android.net.Uri;
33 import android.os.Handler;
34 import android.os.Looper;
35 import android.os.Process;
36 import android.os.UserManager;
37 import android.provider.Settings.System;
38 import android.text.TextUtils;
39 
40 import androidx.preference.Preference;
41 import androidx.preference.PreferenceScreen;
42 
43 import com.android.settings.R;
44 import com.android.settings.Utils;
45 import com.android.settings.accessibility.Flags;
46 import com.android.settings.core.BasePreferenceController;
47 import com.android.settings.core.PreferenceControllerMixin;
48 import com.android.settings.core.SettingsBaseActivity;
49 import com.android.settingslib.core.lifecycle.Lifecycle;
50 import com.android.settingslib.core.lifecycle.LifecycleObserver;
51 import com.android.settingslib.core.lifecycle.events.OnStart;
52 import com.android.settingslib.core.lifecycle.events.OnStop;
53 import com.android.settingslib.transition.SettingsTransitionHelper;
54 
55 import java.text.NumberFormat;
56 
57 public class BrightnessLevelPreferenceController extends BasePreferenceController implements
58         PreferenceControllerMixin, LifecycleObserver, OnStart, OnStop {
59 
60     private static final String TAG = "BrightnessPrefCtrl";
61 
62     private static final Uri BRIGHTNESS_ADJ_URI;
63     private final ContentResolver mContentResolver;
64     private final Handler mHandler = new Handler(Looper.getMainLooper());
65     private final DisplayManager mDisplayManager;
66     @Nullable
67     private Preference mPreference;
68     private boolean mInSetupWizard;
69 
70     static {
71         BRIGHTNESS_ADJ_URI = System.getUriFor(System.SCREEN_AUTO_BRIGHTNESS_ADJ);
72     }
73 
74     private ContentObserver mBrightnessObserver =
75             new ContentObserver(mHandler) {
76                 @Override
77                 public void onChange(boolean selfChange) {
78                     updatedSummary(mPreference);
79                 }
80             };
81 
82     private final DisplayListener mDisplayListener = new DisplayListener() {
83         @Override
84         public void onDisplayAdded(int displayId) {
85         }
86 
87         @Override
88         public void onDisplayRemoved(int displayId) {
89         }
90 
91         @Override
92         public void onDisplayChanged(int displayId) {
93             updatedSummary(mPreference);
94         }
95     };
96 
BrightnessLevelPreferenceController(Context context, Lifecycle lifecycle)97     public BrightnessLevelPreferenceController(Context context, Lifecycle lifecycle) {
98         this(context, context.getString(R.string.preference_key_brightness_level), lifecycle);
99     }
100 
BrightnessLevelPreferenceController(Context context, String key, Lifecycle lifecycle)101     private BrightnessLevelPreferenceController(Context context, String key, Lifecycle lifecycle) {
102         super(context, key);
103         mDisplayManager = context.getSystemService(DisplayManager.class);
104 
105         if (lifecycle != null) {
106             lifecycle.addObserver(this);
107         }
108         mContentResolver = mContext.getContentResolver();
109     }
110 
setInSetupWizard(boolean inSetupWizard)111     public void setInSetupWizard(boolean inSetupWizard) {
112         mInSetupWizard = inSetupWizard;
113     }
114 
115     @Override
getAvailabilityStatus()116     public int getAvailabilityStatus() {
117         if (mInSetupWizard && !Flags.addBrightnessSettingsInSuw()) {
118             return CONDITIONALLY_UNAVAILABLE;
119         }
120         return AVAILABLE;
121     }
122 
123     @Override
displayPreference(PreferenceScreen screen)124     public void displayPreference(PreferenceScreen screen) {
125         super.displayPreference(screen);
126         mPreference = screen.findPreference(getPreferenceKey());
127     }
128 
129     @Override
updateState(Preference preference)130     public void updateState(Preference preference) {
131         if (preference.isEnabled() && UserManager.get(mContext).hasBaseUserRestriction(
132                 UserManager.DISALLOW_CONFIG_BRIGHTNESS, Process.myUserHandle())) {
133             preference.setEnabled(false);
134         }
135         updatedSummary(preference);
136     }
137 
138     @Override
onStart()139     public void onStart() {
140         mContentResolver.registerContentObserver(BRIGHTNESS_ADJ_URI, false, mBrightnessObserver);
141         mDisplayManager.registerDisplayListener(mDisplayListener, mHandler,
142                 DisplayManager.EVENT_FLAG_DISPLAY_BRIGHTNESS);
143         updatedSummary(mPreference);
144     }
145 
146     @Override
onStop()147     public void onStop() {
148         mContentResolver.unregisterContentObserver(mBrightnessObserver);
149         mDisplayManager.unregisterDisplayListener(mDisplayListener);
150     }
151 
152     @Override
handlePreferenceTreeClick(Preference preference)153     public boolean handlePreferenceTreeClick(Preference preference) {
154         if (!TextUtils.equals(preference.getKey(), getPreferenceKey())) {
155             return false;
156         }
157         final Intent intent = new Intent(ACTION_SHOW_BRIGHTNESS_DIALOG);
158         intent.setPackage(Utils.SYSTEMUI_PACKAGE_NAME);
159         intent.putExtra(SettingsBaseActivity.EXTRA_PAGE_TRANSITION_TYPE,
160                 SettingsTransitionHelper.TransitionType.TRANSITION_NONE);
161         intent.putExtra(EXTRA_BRIGHTNESS_DIALOG_IS_FULL_WIDTH, true);
162 
163         // Start activity in the same task and pass fade animations
164         final ActivityOptions options = ActivityOptions.makeCustomAnimation(mContext,
165                 android.R.anim.fade_in, android.R.anim.fade_out);
166         mContext.startActivityForResult(preference.getKey(), intent, 0, options.toBundle());
167         return true;
168     }
169 
updatedSummary(Preference preference)170     private void updatedSummary(Preference preference) {
171         if (preference != null) {
172             preference.setSummary(NumberFormat.getPercentInstance().format(getCurrentBrightness()));
173         }
174     }
175 
getCurrentBrightness()176     private double getCurrentBrightness() {
177         int value = 0;
178         final BrightnessInfo info = mContext.getDisplay().getBrightnessInfo();
179         if (info != null) {
180             value = convertLinearToGammaFloat(info.brightness, info.brightnessMinimum,
181                     info.brightnessMaximum);
182         }
183         return getPercentage(value, GAMMA_SPACE_MIN, GAMMA_SPACE_MAX);
184     }
185 
getPercentage(double value, int min, int max)186     private double getPercentage(double value, int min, int max) {
187         if (value > max) {
188             return 1.0;
189         }
190         if (value < min) {
191             return 0.0;
192         }
193         return (value - min) / (max - min);
194     }
195 }
196