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 package com.android.car.settings.quicksettings; 17 18 import static android.provider.Settings.System.SCREEN_BRIGHTNESS; 19 20 import static com.android.settingslib.display.BrightnessUtils.GAMMA_SPACE_MAX; 21 import static com.android.settingslib.display.BrightnessUtils.convertGammaToLinear; 22 import static com.android.settingslib.display.BrightnessUtils.convertLinearToGamma; 23 24 import android.car.userlib.CarUserManagerHelper; 25 import android.content.Context; 26 import android.os.PowerManager; 27 import android.provider.Settings.SettingNotFoundException; 28 import android.provider.Settings.System; 29 import android.widget.SeekBar; 30 31 import com.android.car.settings.common.Logger; 32 33 /** 34 * A slider to adjust the brightness of the screen 35 */ 36 public class BrightnessTile implements QuickSettingGridAdapter.SeekbarTile { 37 private static final Logger LOG = new Logger(BrightnessTile.class); 38 private CarUserManagerHelper mCarUserManagerHelper; 39 private final Context mContext; 40 private final int mMaximumBacklight; 41 private final int mMinimumBacklight; 42 BrightnessTile(Context context)43 public BrightnessTile(Context context) { 44 mContext = context; 45 mCarUserManagerHelper = new CarUserManagerHelper(mContext); 46 PowerManager powerManager = (PowerManager) context.getSystemService(Context.POWER_SERVICE); 47 mMaximumBacklight = powerManager.getMaximumScreenBrightnessSetting(); 48 mMinimumBacklight = powerManager.getMinimumScreenBrightnessSetting(); 49 } 50 51 @Override onStartTrackingTouch(SeekBar seekBar)52 public void onStartTrackingTouch(SeekBar seekBar) { 53 // don't care 54 } 55 56 @Override onStopTrackingTouch(SeekBar seekBar)57 public void onStopTrackingTouch(SeekBar seekBar) { 58 // don't care 59 } 60 61 @Override onProgressChanged(SeekBar seekBar, int gamma, boolean fromUser)62 public void onProgressChanged(SeekBar seekBar, int gamma, boolean fromUser) { 63 int linear = convertGammaToLinear(gamma, mMinimumBacklight, mMaximumBacklight); 64 System.putIntForUser(mContext.getContentResolver(), SCREEN_BRIGHTNESS, linear, 65 mCarUserManagerHelper.getCurrentForegroundUserId()); 66 } 67 68 @Override getMax()69 public int getMax() { 70 return GAMMA_SPACE_MAX; 71 } 72 73 @Override start()74 public void start() { 75 } 76 77 @Override stop()78 public void stop() { 79 } 80 81 @Override getCurrent()82 public int getCurrent() { 83 int gamma = GAMMA_SPACE_MAX; 84 try { 85 int linear = System.getIntForUser(mContext.getContentResolver(), SCREEN_BRIGHTNESS, 86 mCarUserManagerHelper.getCurrentForegroundUserId()); 87 gamma = convertLinearToGamma(linear, mMinimumBacklight, mMaximumBacklight); 88 } catch (SettingNotFoundException e) { 89 LOG.w("Can't find setting for SCREEN_BRIGHTNESS."); 90 } 91 return gamma; 92 } 93 } 94