/*
* Copyright (C) 2013 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.systemui.settings;
import android.content.ContentResolver;
import android.content.Context;
import android.database.ContentObserver;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Handler;
import android.os.IPowerManager;
import android.os.PowerManager;
import android.os.RemoteException;
import android.os.ServiceManager;
import android.os.UserHandle;
import android.provider.Settings;
import android.widget.ImageView;
import java.util.ArrayList;
public class BrightnessController implements ToggleSlider.Listener {
private static final String TAG = "StatusBar.BrightnessController";
private static final boolean SHOW_AUTOMATIC_ICON = false;
/**
* {@link android.provider.Settings.System#SCREEN_AUTO_BRIGHTNESS_ADJ} uses the range [-1, 1].
* Using this factor, it is converted to [0, BRIGHTNESS_ADJ_RESOLUTION] for the SeekBar.
*/
private static final float BRIGHTNESS_ADJ_RESOLUTION = 100;
private final int mMinimumBacklight;
private final int mMaximumBacklight;
private final Context mContext;
private final ImageView mIcon;
private final ToggleSlider mControl;
private final boolean mAutomaticAvailable;
private final IPowerManager mPower;
private final CurrentUserTracker mUserTracker;
private final Handler mHandler;
private final BrightnessObserver mBrightnessObserver;
private ArrayList<BrightnessStateChangeCallback> mChangeCallbacks =
new ArrayList<BrightnessStateChangeCallback>();
private boolean mAutomatic;
private boolean mListening;
private boolean mExternalChange;
public interface BrightnessStateChangeCallback {
public void onBrightnessLevelChanged();
}
/** ContentObserver to watch brightness **/
private class BrightnessObserver extends ContentObserver {
private final Uri BRIGHTNESS_MODE_URI =
Settings.System.getUriFor(Settings.System.SCREEN_BRIGHTNESS_MODE);
private final Uri BRIGHTNESS_URI =
Settings.System.getUriFor(Settings.System.SCREEN_BRIGHTNESS);
private final Uri BRIGHTNESS_ADJ_URI =
Settings.System.getUriFor(Settings.System.SCREEN_AUTO_BRIGHTNESS_ADJ);
public BrightnessObserver(Handler handler) {
super(handler);
}
@Override
public void onChange(boolean selfChange) {
onChange(selfChange, null);
}
@Override
public void onChange(boolean selfChange, Uri uri) {
if (selfChange) return;
try {
mExternalChange = true;
if (BRIGHTNESS_MODE_URI.equals(uri)) {
updateMode();
updateSlider();
} else if (BRIGHTNESS_URI.equals(uri) && !mAutomatic) {
updateSlider();
} else if (BRIGHTNESS_ADJ_URI.equals(uri) && mAutomatic) {
updateSlider();
} else {
updateMode();
updateSlider();
}
for (BrightnessStateChangeCallback cb : mChangeCallbacks) {
cb.onBrightnessLevelChanged();
}
} finally {
mExternalChange = false;
}
}
public void startObserving() {
final ContentResolver cr = mContext.getContentResolver();
cr.unregisterContentObserver(this);
cr.registerContentObserver(
BRIGHTNESS_MODE_URI,
false, this, UserHandle.USER_ALL);
cr.registerContentObserver(
BRIGHTNESS_URI,
false, this, UserHandle.USER_ALL);
cr.registerContentObserver(
BRIGHTNESS_ADJ_URI,
false, this, UserHandle.USER_ALL);
}
public void stopObserving() {
final ContentResolver cr = mContext.getContentResolver();
cr.unregisterContentObserver(this);
}
}
public BrightnessController(Context context, ImageView icon, ToggleSlider control) {
mContext = context;
mIcon = icon;
mControl = control;
mHandler = new Handler();
mUserTracker = new CurrentUserTracker(mContext) {
@Override
public void onUserSwitched(int newUserId) {
updateMode();
updateSlider();
}
};
mBrightnessObserver = new BrightnessObserver(mHandler);
PowerManager pm = (PowerManager)context.getSystemService(Context.POWER_SERVICE);
mMinimumBacklight = pm.getMinimumScreenBrightnessSetting();
mMaximumBacklight = pm.getMaximumScreenBrightnessSetting();
mAutomaticAvailable = context.getResources().getBoolean(
com.android.internal.R.bool.config_automatic_brightness_available);
mPower = IPowerManager.Stub.asInterface(ServiceManager.getService("power"));
}
public void addStateChangedCallback(BrightnessStateChangeCallback cb) {
mChangeCallbacks.add(cb);
}
public boolean removeStateChangedCallback(BrightnessStateChangeCallback cb) {
return mChangeCallbacks.remove(cb);
}
@Override
public void onInit(ToggleSlider control) {
// Do nothing
}
public void registerCallbacks() {
if (mListening) {
return;
}
mBrightnessObserver.startObserving();
mUserTracker.startTracking();
// Update the slider and mode before attaching the listener so we don't
// receive the onChanged notifications for the initial values.
updateMode();
updateSlider();
mControl.setOnChangedListener(this);
mListening = true;
}
/** Unregister all call backs, both to and from the controller */
public void unregisterCallbacks() {
if (!mListening) {
return;
}
mBrightnessObserver.stopObserving();
mUserTracker.stopTracking();
mControl.setOnChangedListener(null);
mListening = false;
}
@Override
public void onChanged(ToggleSlider view, boolean tracking, boolean automatic, int value) {
updateIcon(mAutomatic);
if (mExternalChange) return;
if (!mAutomatic) {
final int val = value + mMinimumBacklight;
setBrightness(val);
if (!tracking) {
AsyncTask.execute(new Runnable() {
public void run() {
Settings.System.putIntForUser(mContext.getContentResolver(),
Settings.System.SCREEN_BRIGHTNESS, val,
UserHandle.USER_CURRENT);
}
});
}
} else {
final float adj = value / (BRIGHTNESS_ADJ_RESOLUTION / 2f) - 1;
setBrightnessAdj(adj);
if (!tracking) {
AsyncTask.execute(new Runnable() {
public void run() {
Settings.System.putFloatForUser(mContext.getContentResolver(),
Settings.System.SCREEN_AUTO_BRIGHTNESS_ADJ, adj,
UserHandle.USER_CURRENT);
}
});
}
}
for (BrightnessStateChangeCallback cb : mChangeCallbacks) {
cb.onBrightnessLevelChanged();
}
}
private void setMode(int mode) {
Settings.System.putIntForUser(mContext.getContentResolver(),
Settings.System.SCREEN_BRIGHTNESS_MODE, mode,
mUserTracker.getCurrentUserId());
}
private void setBrightness(int brightness) {
try {
mPower.setTemporaryScreenBrightnessSettingOverride(brightness);
} catch (RemoteException ex) {
}
}
private void setBrightnessAdj(float adj) {
try {
mPower.setTemporaryScreenAutoBrightnessAdjustmentSettingOverride(adj);
} catch (RemoteException ex) {
}
}
private void updateIcon(boolean automatic) {
if (mIcon != null) {
mIcon.setImageResource(automatic && SHOW_AUTOMATIC_ICON ?
com.android.systemui.R.drawable.ic_qs_brightness_auto_on :
com.android.systemui.R.drawable.ic_qs_brightness_auto_off);
}
}
/** Fetch the brightness mode from the system settings and update the icon */
private void updateMode() {
if (mAutomaticAvailable) {
int automatic;
automatic = Settings.System.getIntForUser(mContext.getContentResolver(),
Settings.System.SCREEN_BRIGHTNESS_MODE,
Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL,
UserHandle.USER_CURRENT);
mAutomatic = automatic != Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL;
updateIcon(mAutomatic);
} else {
mControl.setChecked(false);
updateIcon(false /*automatic*/);
}
}
/** Fetch the brightness from the system settings and update the slider */
private void updateSlider() {
if (mAutomatic) {
float value = Settings.System.getFloatForUser(mContext.getContentResolver(),
Settings.System.SCREEN_AUTO_BRIGHTNESS_ADJ, 0,
UserHandle.USER_CURRENT);
mControl.setMax((int) BRIGHTNESS_ADJ_RESOLUTION);
mControl.setValue((int) ((value + 1) * BRIGHTNESS_ADJ_RESOLUTION / 2f));
} else {
int value;
value = Settings.System.getIntForUser(mContext.getContentResolver(),
Settings.System.SCREEN_BRIGHTNESS, mMaximumBacklight,
UserHandle.USER_CURRENT);
mControl.setMax(mMaximumBacklight - mMinimumBacklight);
mControl.setValue(value - mMinimumBacklight);
}
}
}
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