packages/SystemUI/src/com/android/systemui/settings/BrightnessController.java - platform/frameworks/base - Git at Google

 /*
  * 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);
         }
     }

 }
	/*
	* 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);
	}
	}

	}