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.app.ActivityManager; 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 final Context mContext; 39 private final int mMaximumBacklight; 40 private final int mMinimumBacklight; 41 BrightnessTile(Context context)42 public BrightnessTile(Context context) { 43 mContext = context; 44 PowerManager powerManager = (PowerManager) context.getSystemService(Context.POWER_SERVICE); 45 mMaximumBacklight = powerManager.getMaximumScreenBrightnessSetting(); 46 mMinimumBacklight = powerManager.getMinimumScreenBrightnessSetting(); 47 } 48 49 @Override onStartTrackingTouch(SeekBar seekBar)50 public void onStartTrackingTouch(SeekBar seekBar) { 51 // don't care 52 } 53 54 @Override onStopTrackingTouch(SeekBar seekBar)55 public void onStopTrackingTouch(SeekBar seekBar) { 56 // don't care 57 } 58 59 @Override onProgressChanged(SeekBar seekBar, int gamma, boolean fromUser)60 public void onProgressChanged(SeekBar seekBar, int gamma, boolean fromUser) { 61 int linear = convertGammaToLinear(gamma, mMinimumBacklight, mMaximumBacklight); 62 System.putIntForUser(mContext.getContentResolver(), SCREEN_BRIGHTNESS, linear, 63 ActivityManager.getCurrentUser()); 64 } 65 66 @Override getMax()67 public int getMax() { 68 return GAMMA_SPACE_MAX; 69 } 70 71 @Override start()72 public void start() { 73 } 74 75 @Override stop()76 public void stop() { 77 } 78 79 @Override getCurrent()80 public int getCurrent() { 81 int gamma = GAMMA_SPACE_MAX; 82 try { 83 int linear = System.getIntForUser(mContext.getContentResolver(), SCREEN_BRIGHTNESS, 84 ActivityManager.getCurrentUser()); 85 gamma = convertLinearToGamma(linear, mMinimumBacklight, mMaximumBacklight); 86 } catch (SettingNotFoundException e) { 87 LOG.w("Can't find setting for SCREEN_BRIGHTNESS."); 88 } 89 return gamma; 90 } 91 } 92