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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     private static final int MINIMUM_BACKLIGHT = android.os.PowerManager.BRIGHTNESS_DIM;
     35     private static final int MAXIMUM_BACKLIGHT = android.os.PowerManager.BRIGHTNESS_ON;
     36 
     37     private Context mContext;
     38     private ToggleSlider mControl;
     39     private IPowerManager mPower;
     40 
     41     public BrightnessController(Context context, ToggleSlider control) {
     42         mContext = context;
     43         mControl = control;
     44 
     45         boolean automaticAvailable = context.getResources().getBoolean(
     46                 com.android.internal.R.bool.config_automatic_brightness_available);
     47         mPower = IPowerManager.Stub.asInterface(ServiceManager.getService("power"));
     48 
     49         if (automaticAvailable) {
     50             int automatic;
     51             try {
     52                 automatic = Settings.System.getInt(mContext.getContentResolver(),
     53                         Settings.System.SCREEN_BRIGHTNESS_MODE);
     54             } catch (SettingNotFoundException snfe) {
     55                 automatic = 0;
     56             }
     57             control.setChecked(automatic != 0);
     58         } else {
     59             control.setChecked(false);
     60             //control.hideToggle();
     61         }
     62 
     63         int value;
     64         try {
     65             value = Settings.System.getInt(mContext.getContentResolver(),
     66                     Settings.System.SCREEN_BRIGHTNESS);
     67         } catch (SettingNotFoundException ex) {
     68             value = MAXIMUM_BACKLIGHT;
     69         }
     70 
     71         control.setMax(MAXIMUM_BACKLIGHT - MINIMUM_BACKLIGHT);
     72         control.setValue(value - MINIMUM_BACKLIGHT);
     73 
     74         control.setOnChangedListener(this);
     75     }
     76 
     77     public void onChanged(ToggleSlider view, boolean tracking, boolean automatic, int value) {
     78         setMode(automatic ? Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC
     79                 : Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL);
     80         if (!automatic) {
     81             final int val = value + MINIMUM_BACKLIGHT;
     82             setBrightness(val);
     83             if (!tracking) {
     84                 AsyncTask.execute(new Runnable() {
     85                         public void run() {
     86                             Settings.System.putInt(mContext.getContentResolver(),
     87                                     Settings.System.SCREEN_BRIGHTNESS, val);
     88                         }
     89                     });
     90             }
     91         }
     92     }
     93 
     94     private void setMode(int mode) {
     95         Settings.System.putInt(mContext.getContentResolver(),
     96                 Settings.System.SCREEN_BRIGHTNESS_MODE, mode);
     97     }
     98 
     99     private void setBrightness(int brightness) {
    100         try {
    101             mPower.setBacklightBrightness(brightness);
    102         } catch (RemoteException ex) {
    103         }
    104     }
    105 }
    106