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.settings.display; 18 19 import android.content.Context; 20 import android.support.v7.preference.Preference; 21 import android.support.v7.preference.PreferenceScreen; 22 import android.text.TextUtils; 23 24 import com.android.internal.app.ColorDisplayController; 25 import com.android.settings.core.SliderPreferenceController; 26 import com.android.settings.widget.SeekBarPreference; 27 28 public class NightDisplayIntensityPreferenceController extends SliderPreferenceController { 29 30 private ColorDisplayController mController; 31 NightDisplayIntensityPreferenceController(Context context, String key)32 public NightDisplayIntensityPreferenceController(Context context, String key) { 33 super(context, key); 34 mController = new ColorDisplayController(context); 35 } 36 37 @Override getAvailabilityStatus()38 public int getAvailabilityStatus() { 39 if (!ColorDisplayController.isAvailable(mContext)) { 40 return UNSUPPORTED_ON_DEVICE; 41 } else if (!mController.isActivated()) { 42 return DISABLED_DEPENDENT_SETTING; 43 } 44 return AVAILABLE; 45 } 46 47 @Override isSliceable()48 public boolean isSliceable() { 49 return TextUtils.equals(getPreferenceKey(), "night_display_temperature"); 50 } 51 52 @Override displayPreference(PreferenceScreen screen)53 public void displayPreference(PreferenceScreen screen) { 54 super.displayPreference(screen); 55 final SeekBarPreference preference = (SeekBarPreference) screen.findPreference( 56 getPreferenceKey()); 57 preference.setContinuousUpdates(true); 58 preference.setMax(getMaxSteps()); 59 } 60 61 @Override updateState(Preference preference)62 public final void updateState(Preference preference) { 63 super.updateState(preference); 64 preference.setEnabled(mController.isActivated()); 65 } 66 67 @Override getSliderPosition()68 public int getSliderPosition() { 69 return convertTemperature(mController.getColorTemperature()); 70 } 71 72 @Override setSliderPosition(int position)73 public boolean setSliderPosition(int position) { 74 return mController.setColorTemperature(convertTemperature(position)); 75 } 76 77 @Override getMaxSteps()78 public int getMaxSteps() { 79 return convertTemperature(mController.getMinimumColorTemperature()); 80 } 81 82 /** 83 * Inverts and range-adjusts a raw value from the SeekBar (i.e. [0, maxTemp-minTemp]), or 84 * converts an inverted and range-adjusted value to the raw SeekBar value, depending on the 85 * adjustment status of the input. 86 */ convertTemperature(int temperature)87 private int convertTemperature(int temperature) { 88 return mController.getMaximumColorTemperature() - temperature; 89 } 90 }