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      1 /*
      2  * Copyright (C) 2010 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.systemui.statusbar.policy;
     18 
     19 import android.content.ContentResolver;
     20 import android.content.Context;
     21 import android.os.AsyncTask;
     22 import android.os.IPowerManager;
     23 import android.os.RemoteException;
     24 import android.os.ServiceManager;
     25 import android.provider.Settings;
     26 import android.provider.Settings.SettingNotFoundException;
     27 import android.util.Slog;
     28 import android.view.IWindowManager;
     29 import android.widget.CompoundButton;
     30 
     31 public class BrightnessController implements ToggleSlider.Listener {
     32     private static final String TAG = "StatusBar.BrightnessController";
     33 
     34     // Backlight range is from 0 - 255. Need to make sure that user
     35     // doesn't set the backlight to 0 and get stuck
     36     private static final int MINIMUM_BACKLIGHT = android.os.Power.BRIGHTNESS_DIM + 10;
     37     private static final int MAXIMUM_BACKLIGHT = android.os.Power.BRIGHTNESS_ON;
     38 
     39     private Context mContext;
     40     private ToggleSlider mControl;
     41     private IPowerManager mPower;
     42 
     43     public BrightnessController(Context context, ToggleSlider control) {
     44         mContext = context;
     45         mControl = control;
     46 
     47         boolean automaticAvailable = context.getResources().getBoolean(
     48                 com.android.internal.R.bool.config_automatic_brightness_available);
     49         mPower = IPowerManager.Stub.asInterface(ServiceManager.getService("power"));
     50 
     51         if (automaticAvailable) {
     52             int automatic;
     53             try {
     54                 automatic = Settings.System.getInt(mContext.getContentResolver(),
     55                         Settings.System.SCREEN_BRIGHTNESS_MODE);
     56             } catch (SettingNotFoundException snfe) {
     57                 automatic = 0;
     58             }
     59             control.setChecked(automatic != 0);
     60         } else {
     61             control.setChecked(false);
     62             //control.hideToggle();
     63         }
     64 
     65         int value;
     66         try {
     67             value = Settings.System.getInt(mContext.getContentResolver(),
     68                     Settings.System.SCREEN_BRIGHTNESS);
     69         } catch (SettingNotFoundException ex) {
     70             value = MAXIMUM_BACKLIGHT;
     71         }
     72 
     73         control.setMax(MAXIMUM_BACKLIGHT - MINIMUM_BACKLIGHT);
     74         control.setValue(value - MINIMUM_BACKLIGHT);
     75 
     76         control.setOnChangedListener(this);
     77     }
     78 
     79     public void onChanged(ToggleSlider view, boolean tracking, boolean automatic, int value) {
     80         setMode(automatic ? Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC
     81                 : Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL);
     82         if (!automatic) {
     83             final int val = value + MINIMUM_BACKLIGHT;
     84             setBrightness(val);
     85             if (!tracking) {
     86                 AsyncTask.execute(new Runnable() {
     87                         public void run() {
     88                             Settings.System.putInt(mContext.getContentResolver(),
     89                                     Settings.System.SCREEN_BRIGHTNESS, val);
     90                         }
     91                     });
     92             }
     93         }
     94     }
     95 
     96     private void setMode(int mode) {
     97         Settings.System.putInt(mContext.getContentResolver(),
     98                 Settings.System.SCREEN_BRIGHTNESS_MODE, mode);
     99     }
    100 
    101     private void setBrightness(int brightness) {
    102         try {
    103             mPower.setBacklightBrightness(brightness);
    104         } catch (RemoteException ex) {
    105         }
    106     }
    107 }
    108