/*
* Copyright (C) 2008 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.settings;
import android.content.ContentResolver;
import android.content.Context;
import android.database.ContentObserver;
import android.os.Bundle;
import android.os.Handler;
import android.os.IPowerManager;
import android.os.Parcel;
import android.os.Parcelable;
import android.os.RemoteException;
import android.os.ServiceManager;
import android.preference.SeekBarDialogPreference;
import android.provider.Settings;
import android.provider.Settings.SettingNotFoundException;
import android.util.AttributeSet;
import android.view.View;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.SeekBar;
public class BrightnessPreference extends SeekBarDialogPreference implements
SeekBar.OnSeekBarChangeListener, CheckBox.OnCheckedChangeListener {
private SeekBar mSeekBar;
private CheckBox mCheckBox;
private int mOldBrightness;
private int mOldAutomatic;
private boolean mAutomaticAvailable;
private boolean mRestoredOldState;
// Backlight range is from 0 - 255. Need to make sure that user
// doesn't set the backlight to 0 and get stuck
private int mScreenBrightnessDim =
getContext().getResources().getInteger(com.android.internal.R.integer.config_screenBrightnessDim);
private static final int MAXIMUM_BACKLIGHT = android.os.Power.BRIGHTNESS_ON;
private ContentObserver mBrightnessObserver = new ContentObserver(new Handler()) {
@Override
public void onChange(boolean selfChange) {
onBrightnessChanged();
}
};
private ContentObserver mBrightnessModeObserver = new ContentObserver(new Handler()) {
@Override
public void onChange(boolean selfChange) {
onBrightnessModeChanged();
}
};
public BrightnessPreference(Context context, AttributeSet attrs) {
super(context, attrs);
mAutomaticAvailable = context.getResources().getBoolean(
com.android.internal.R.bool.config_automatic_brightness_available);
setDialogLayoutResource(R.layout.preference_dialog_brightness);
setDialogIcon(R.drawable.ic_settings_display);
}
@Override
protected void showDialog(Bundle state) {
super.showDialog(state);
getContext().getContentResolver().registerContentObserver(
Settings.System.getUriFor(Settings.System.SCREEN_BRIGHTNESS), true,
mBrightnessObserver);
getContext().getContentResolver().registerContentObserver(
Settings.System.getUriFor(Settings.System.SCREEN_BRIGHTNESS_MODE), true,
mBrightnessModeObserver);
mRestoredOldState = false;
}
@Override
protected void onBindDialogView(View view) {
super.onBindDialogView(view);
mSeekBar = getSeekBar(view);
mSeekBar.setMax(MAXIMUM_BACKLIGHT - mScreenBrightnessDim);
mOldBrightness = getBrightness(0);
mSeekBar.setProgress(mOldBrightness - mScreenBrightnessDim);
mCheckBox = (CheckBox)view.findViewById(R.id.automatic_mode);
if (mAutomaticAvailable) {
mCheckBox.setOnCheckedChangeListener(this);
mOldAutomatic = getBrightnessMode(0);
mCheckBox.setChecked(mOldAutomatic != 0);
} else {
mCheckBox.setVisibility(View.GONE);
}
mSeekBar.setOnSeekBarChangeListener(this);
}
public void onProgressChanged(SeekBar seekBar, int progress,
boolean fromTouch) {
setBrightness(progress + mScreenBrightnessDim);
}
public void onStartTrackingTouch(SeekBar seekBar) {
// NA
}
public void onStopTrackingTouch(SeekBar seekBar) {
// NA
}
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
setMode(isChecked ? Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC
: Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL);
if (!isChecked) {
setBrightness(mSeekBar.getProgress() + mScreenBrightnessDim);
}
}
private int getBrightness(int defaultValue) {
int brightness = defaultValue;
try {
brightness = Settings.System.getInt(getContext().getContentResolver(),
Settings.System.SCREEN_BRIGHTNESS);
} catch (SettingNotFoundException snfe) {
}
return brightness;
}
private int getBrightnessMode(int defaultValue) {
int brightnessMode = defaultValue;
try {
brightnessMode = Settings.System.getInt(getContext().getContentResolver(),
Settings.System.SCREEN_BRIGHTNESS_MODE);
} catch (SettingNotFoundException snfe) {
}
return brightnessMode;
}
private void onBrightnessChanged() {
int brightness = getBrightness(MAXIMUM_BACKLIGHT);
mSeekBar.setProgress(brightness - mScreenBrightnessDim);
}
private void onBrightnessModeChanged() {
boolean checked = getBrightnessMode(0) != 0;
mCheckBox.setChecked(checked);
}
@Override
protected void onDialogClosed(boolean positiveResult) {
super.onDialogClosed(positiveResult);
final ContentResolver resolver = getContext().getContentResolver();
if (positiveResult) {
Settings.System.putInt(resolver,
Settings.System.SCREEN_BRIGHTNESS,
mSeekBar.getProgress() + mScreenBrightnessDim);
} else {
restoreOldState();
}
resolver.unregisterContentObserver(mBrightnessObserver);
resolver.unregisterContentObserver(mBrightnessModeObserver);
}
private void restoreOldState() {
if (mRestoredOldState) return;
if (mAutomaticAvailable) {
setMode(mOldAutomatic);
}
if (!mAutomaticAvailable || mOldAutomatic == 0) {
setBrightness(mOldBrightness);
}
mRestoredOldState = true;
}
private void setBrightness(int brightness) {
try {
IPowerManager power = IPowerManager.Stub.asInterface(
ServiceManager.getService("power"));
if (power != null) {
power.setBacklightBrightness(brightness);
}
} catch (RemoteException doe) {
}
}
private void setMode(int mode) {
if (mode == Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC) {
mSeekBar.setVisibility(View.GONE);
} else {
mSeekBar.setVisibility(View.VISIBLE);
}
Settings.System.putInt(getContext().getContentResolver(),
Settings.System.SCREEN_BRIGHTNESS_MODE, mode);
}
@Override
protected Parcelable onSaveInstanceState() {
final Parcelable superState = super.onSaveInstanceState();
if (getDialog() == null || !getDialog().isShowing()) return superState;
// Save the dialog state
final SavedState myState = new SavedState(superState);
myState.automatic = mCheckBox.isChecked();
myState.progress = mSeekBar.getProgress();
myState.oldAutomatic = mOldAutomatic == 1;
myState.oldProgress = mOldBrightness;
// Restore the old state when the activity or dialog is being paused
restoreOldState();
return myState;
}
@Override
protected void onRestoreInstanceState(Parcelable state) {
if (state == null || !state.getClass().equals(SavedState.class)) {
// Didn't save state for us in onSaveInstanceState
super.onRestoreInstanceState(state);
return;
}
SavedState myState = (SavedState) state;
super.onRestoreInstanceState(myState.getSuperState());
mOldBrightness = myState.oldProgress;
mOldAutomatic = myState.oldAutomatic ? 1 : 0;
setMode(myState.automatic ? 1 : 0);
setBrightness(myState.progress + mScreenBrightnessDim);
}
private static class SavedState extends BaseSavedState {
boolean automatic;
boolean oldAutomatic;
int progress;
int oldProgress;
public SavedState(Parcel source) {
super(source);
automatic = source.readInt() == 1;
progress = source.readInt();
oldAutomatic = source.readInt() == 1;
oldProgress = source.readInt();
}
@Override
public void writeToParcel(Parcel dest, int flags) {
super.writeToParcel(dest, flags);
dest.writeInt(automatic ? 1 : 0);
dest.writeInt(progress);
dest.writeInt(oldAutomatic ? 1 : 0);
dest.writeInt(oldProgress);
}
public SavedState(Parcelable superState) {
super(superState);
}
public static final Parcelable.Creator<SavedState> CREATOR =
new Parcelable.Creator<SavedState>() {
public SavedState createFromParcel(Parcel in) {
return new SavedState(in);
}
public SavedState[] newArray(int size) {
return new SavedState[size];
}
};
}
}