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/*
* Copyright (C) 2011 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.hardware.input.InputManager;
import android.os.Bundle;
import android.os.Handler;
import android.os.Parcel;
import android.os.Parcelable;
import android.preference.SeekBarDialogPreference;
import android.provider.Settings;
import android.util.AttributeSet;
import android.view.View;
import android.widget.SeekBar;
public class PointerSpeedPreference extends SeekBarDialogPreference implements
SeekBar.OnSeekBarChangeListener {
private final InputManager mIm;
private SeekBar mSeekBar;
private int mOldSpeed;
private boolean mRestoredOldState;
private boolean mTouchInProgress;
private ContentObserver mSpeedObserver = new ContentObserver(new Handler()) {
@Override
public void onChange(boolean selfChange) {
onSpeedChanged();
}
};
public PointerSpeedPreference(Context context, AttributeSet attrs) {
super(context, attrs);
mIm = (InputManager)getContext().getSystemService(Context.INPUT_SERVICE);
}
@Override
protected void showDialog(Bundle state) {
super.showDialog(state);
getContext().getContentResolver().registerContentObserver(
Settings.System.getUriFor(Settings.System.POINTER_SPEED), true,
mSpeedObserver);
mRestoredOldState = false;
}
@Override
protected void onBindDialogView(View view) {
super.onBindDialogView(view);
mSeekBar = getSeekBar(view);
mSeekBar.setMax(InputManager.MAX_POINTER_SPEED - InputManager.MIN_POINTER_SPEED);
mOldSpeed = mIm.getPointerSpeed(getContext());
mSeekBar.setProgress(mOldSpeed - InputManager.MIN_POINTER_SPEED);
mSeekBar.setOnSeekBarChangeListener(this);
}
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromTouch) {
if (!mTouchInProgress) {
mIm.tryPointerSpeed(progress + InputManager.MIN_POINTER_SPEED);
}
}
public void onStartTrackingTouch(SeekBar seekBar) {
mTouchInProgress = true;
}
public void onStopTrackingTouch(SeekBar seekBar) {
mTouchInProgress = false;
mIm.tryPointerSpeed(seekBar.getProgress() + InputManager.MIN_POINTER_SPEED);
}
private void onSpeedChanged() {
int speed = mIm.getPointerSpeed(getContext());
mSeekBar.setProgress(speed - InputManager.MIN_POINTER_SPEED);
}
@Override
protected void onDialogClosed(boolean positiveResult) {
super.onDialogClosed(positiveResult);
final ContentResolver resolver = getContext().getContentResolver();
if (positiveResult) {
mIm.setPointerSpeed(getContext(),
mSeekBar.getProgress() + InputManager.MIN_POINTER_SPEED);
} else {
restoreOldState();
}
resolver.unregisterContentObserver(mSpeedObserver);
}
private void restoreOldState() {
if (mRestoredOldState) return;
mIm.tryPointerSpeed(mOldSpeed);
mRestoredOldState = true;
}
@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.progress = mSeekBar.getProgress();
myState.oldSpeed = mOldSpeed;
// 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());
mOldSpeed = myState.oldSpeed;
mSeekBar.setProgress(myState.progress);
mIm.tryPointerSpeed(myState.progress + InputManager.MIN_POINTER_SPEED);
}
private static class SavedState extends BaseSavedState {
int progress;
int oldSpeed;
public SavedState(Parcel source) {
super(source);
progress = source.readInt();
oldSpeed = source.readInt();
}
@Override
public void writeToParcel(Parcel dest, int flags) {
super.writeToParcel(dest, flags);
dest.writeInt(progress);
dest.writeInt(oldSpeed);
}
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];
}
};
}
}
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