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
17package com.android.systemui.statusbar.policy;
18
19import android.content.ContentResolver;
20import android.content.Context;
21import android.os.AsyncTask;
22import android.os.IPowerManager;
23import android.os.PowerManager;
24import android.os.RemoteException;
25import android.os.ServiceManager;
26import android.provider.Settings;
27import android.provider.Settings.SettingNotFoundException;
28import android.util.Slog;
29import android.view.IWindowManager;
30import android.widget.CompoundButton;
31import android.widget.ImageView;
32
33import com.android.systemui.statusbar.policy.BatteryController.BatteryStateChangeCallback;
34
35import java.util.ArrayList;
36
37public class BrightnessController implements ToggleSlider.Listener {
38    private static final String TAG = "StatusBar.BrightnessController";
39
40    private final int mMinimumBacklight;
41    private final int mMaximumBacklight;
42
43    private final Context mContext;
44    private final ImageView mIcon;
45    private final ToggleSlider mControl;
46    private final boolean mAutomaticAvailable;
47    private final IPowerManager mPower;
48    private final CurrentUserTracker mUserTracker;
49
50    private ArrayList<BrightnessStateChangeCallback> mChangeCallbacks =
51            new ArrayList<BrightnessStateChangeCallback>();
52
53    public interface BrightnessStateChangeCallback {
54        public void onBrightnessLevelChanged();
55    }
56
57    public BrightnessController(Context context, ImageView icon, ToggleSlider control) {
58        mContext = context;
59        mIcon = icon;
60        mControl = control;
61        mUserTracker = new CurrentUserTracker(mContext);
62
63        PowerManager pm = (PowerManager)context.getSystemService(Context.POWER_SERVICE);
64        mMinimumBacklight = pm.getMinimumScreenBrightnessSetting();
65        mMaximumBacklight = pm.getMaximumScreenBrightnessSetting();
66
67        mAutomaticAvailable = context.getResources().getBoolean(
68                com.android.internal.R.bool.config_automatic_brightness_available);
69        mPower = IPowerManager.Stub.asInterface(ServiceManager.getService("power"));
70
71        control.setOnChangedListener(this);
72    }
73
74    public void addStateChangedCallback(BrightnessStateChangeCallback cb) {
75        mChangeCallbacks.add(cb);
76    }
77
78    @Override
79    public void onInit(ToggleSlider control) {
80        if (mAutomaticAvailable) {
81            int automatic;
82            try {
83                automatic = Settings.System.getIntForUser(mContext.getContentResolver(),
84                        Settings.System.SCREEN_BRIGHTNESS_MODE,
85                        mUserTracker.getCurrentUserId());
86            } catch (SettingNotFoundException snfe) {
87                automatic = 0;
88            }
89            control.setChecked(automatic != 0);
90            updateIcon(automatic != 0);
91        } else {
92            control.setChecked(false);
93            updateIcon(false /*automatic*/);
94            //control.hideToggle();
95        }
96
97        int value;
98        try {
99            value = Settings.System.getIntForUser(mContext.getContentResolver(),
100                    Settings.System.SCREEN_BRIGHTNESS,
101                    mUserTracker.getCurrentUserId());
102        } catch (SettingNotFoundException ex) {
103            value = mMaximumBacklight;
104        }
105
106        control.setMax(mMaximumBacklight - mMinimumBacklight);
107        control.setValue(value - mMinimumBacklight);
108    }
109
110    public void onChanged(ToggleSlider view, boolean tracking, boolean automatic, int value) {
111        setMode(automatic ? Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC
112                : Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL);
113        updateIcon(automatic);
114        if (!automatic) {
115            final int val = value + mMinimumBacklight;
116            setBrightness(val);
117            if (!tracking) {
118                AsyncTask.execute(new Runnable() {
119                        public void run() {
120                            Settings.System.putIntForUser(mContext.getContentResolver(),
121                                    Settings.System.SCREEN_BRIGHTNESS, val,
122                                    mUserTracker.getCurrentUserId());
123                        }
124                    });
125            }
126        }
127
128        for (BrightnessStateChangeCallback cb : mChangeCallbacks) {
129            cb.onBrightnessLevelChanged();
130        }
131    }
132
133    private void setMode(int mode) {
134        Settings.System.putIntForUser(mContext.getContentResolver(),
135                Settings.System.SCREEN_BRIGHTNESS_MODE, mode,
136                mUserTracker.getCurrentUserId());
137    }
138
139    private void setBrightness(int brightness) {
140        try {
141            mPower.setTemporaryScreenBrightnessSettingOverride(brightness);
142        } catch (RemoteException ex) {
143        }
144    }
145
146    private void updateIcon(boolean automatic) {
147        if (mIcon != null) {
148            mIcon.setImageResource(automatic ?
149                    com.android.systemui.R.drawable.ic_qs_brightness_auto_on :
150                    com.android.systemui.R.drawable.ic_qs_brightness_auto_off);
151        }
152    }
153}
154