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/*
* Copyright (C) 2019 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.accessibility;
import static com.android.settings.Utils.isNightMode;
import android.content.Context;
import android.content.res.ColorStateList;
import android.content.res.Resources;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.os.UserHandle;
import android.provider.Settings;
import android.util.AttributeSet;
import android.widget.SeekBar;
import androidx.annotation.VisibleForTesting;
import com.android.settings.R;
/**
* A custom seekbar for the balance setting.
*
* Adds a center line indicator between left and right, which snaps to if close.
* Updates Settings.System for balance on progress changed.
*/
public class BalanceSeekBar extends SeekBar {
private final Context mContext;
private final Object mListenerLock = new Object();
private OnSeekBarChangeListener mOnSeekBarChangeListener;
private final OnSeekBarChangeListener mProxySeekBarListener = new OnSeekBarChangeListener() {
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
synchronized (mListenerLock) {
if (mOnSeekBarChangeListener != null) {
mOnSeekBarChangeListener.onStopTrackingTouch(seekBar);
}
}
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
synchronized (mListenerLock) {
if (mOnSeekBarChangeListener != null) {
mOnSeekBarChangeListener.onStartTrackingTouch(seekBar);
}
}
}
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
if (fromUser) {
// Snap to centre when within the specified threshold
if (progress != mCenter
&& progress > mCenter - mSnapThreshold
&& progress < mCenter + mSnapThreshold) {
progress = mCenter;
seekBar.setProgress(progress); // direct update (fromUser becomes false)
}
final float balance = (progress - mCenter) * 0.01f;
Settings.System.putFloatForUser(mContext.getContentResolver(),
Settings.System.MASTER_BALANCE, balance, UserHandle.USER_CURRENT);
}
// If fromUser is false, the call is a set from the framework on creation or on
// internal update. The progress may be zero, ignore (don't change system settings).
// after adjusting the seekbar, notify downstream listener.
// note that progress may have been adjusted in the code above to mCenter.
synchronized (mListenerLock) {
if (mOnSeekBarChangeListener != null) {
mOnSeekBarChangeListener.onProgressChanged(seekBar, progress, fromUser);
}
}
}
};
// Percentage of max to be used as a snap to threshold
@VisibleForTesting
static final float SNAP_TO_PERCENTAGE = 0.03f;
private final Paint mCenterMarkerPaint;
private final Rect mCenterMarkerRect;
// changed in setMax()
private float mSnapThreshold;
private int mCenter;
public BalanceSeekBar(Context context, AttributeSet attrs) {
this(context, attrs, com.android.internal.R.attr.seekBarStyle);
}
public BalanceSeekBar(Context context, AttributeSet attrs, int defStyleAttr) {
this(context, attrs, defStyleAttr, 0 /* defStyleRes */);
}
public BalanceSeekBar(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
mContext = context;
Resources res = getResources();
mCenterMarkerRect = new Rect(0 /* left */, 0 /* top */,
res.getDimensionPixelSize(R.dimen.balance_seekbar_center_marker_width),
res.getDimensionPixelSize(R.dimen.balance_seekbar_center_marker_height));
mCenterMarkerPaint = new Paint();
mCenterMarkerPaint.setColor(isNightMode(context) ? Color.WHITE : Color.BLACK);
mCenterMarkerPaint.setStyle(Paint.Style.FILL);
// Remove the progress colour
setProgressTintList(ColorStateList.valueOf(Color.TRANSPARENT));
super.setOnSeekBarChangeListener(mProxySeekBarListener);
}
@Override
public void setOnSeekBarChangeListener(OnSeekBarChangeListener listener) {
synchronized (mListenerLock) {
mOnSeekBarChangeListener = listener;
}
}
// Note: the superclass AbsSeekBar.setMax is synchronized.
@Override
public synchronized void setMax(int max) {
super.setMax(max);
// update snap to threshold
mCenter = max / 2;
mSnapThreshold = max * SNAP_TO_PERCENTAGE;
}
// Note: the superclass AbsSeekBar.onDraw is synchronized.
@Override
protected synchronized void onDraw(Canvas canvas) {
// Draw a vertical line at 50% that represents centred balance
int seekBarCenter = (canvas.getHeight() - getPaddingBottom()) / 2;
canvas.save();
canvas.translate((canvas.getWidth() - mCenterMarkerRect.right) / 2,
seekBarCenter - (mCenterMarkerRect.bottom / 2));
canvas.drawRect(mCenterMarkerRect, mCenterMarkerPaint);
canvas.restore();
super.onDraw(canvas);
}
@VisibleForTesting
OnSeekBarChangeListener getProxySeekBarListener() {
return mProxySeekBarListener;
}
}
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