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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 android.content.Context;
import android.media.AudioSystem;
import android.os.UserHandle;
import android.provider.Settings;
import android.util.AttributeSet;
import android.view.View;
import android.widget.ImageView;
import android.widget.SeekBar;
import androidx.core.content.res.TypedArrayUtils;
import androidx.preference.Preference;
import androidx.preference.PreferenceViewHolder;
import com.android.settings.R;
import com.android.settings.widget.SeekBarPreference;
/** A slider preference that directly controls audio balance **/
public class BalanceSeekBarPreference extends SeekBarPreference {
private static final int BALANCE_CENTER_VALUE = 100;
private static final int BALANCE_MAX_VALUE = 200;
private final Context mContext;
private BalanceSeekBar mSeekBar;
private ImageView mIconView;
public BalanceSeekBarPreference(Context context, AttributeSet attrs) {
super(context, attrs, TypedArrayUtils.getAttr(context,
R.attr.preferenceStyle,
android.R.attr.preferenceStyle));
mContext = context;
setLayoutResource(R.layout.preference_balance_slider);
}
@Override
public void onBindViewHolder(PreferenceViewHolder view) {
super.onBindViewHolder(view);
mSeekBar = (BalanceSeekBar) view.findViewById(com.android.internal.R.id.seekbar);
mIconView = (ImageView) view.findViewById(com.android.internal.R.id.icon);
init();
}
private void init() {
if (mSeekBar == null) {
return;
}
final float balance = Settings.System.getFloatForUser(
mContext.getContentResolver(), Settings.System.MASTER_BALANCE,
0.f /* default */, UserHandle.USER_CURRENT);
// Rescale balance to range 0-BALANCE_MAX_VALUE centered at BALANCE_MAX_VALUE / 2.
mSeekBar.setMax(BALANCE_MAX_VALUE);
mSeekBar.setProgress((int) (balance * 100.f) + BALANCE_CENTER_VALUE);
mSeekBar.setEnabled(isEnabled());
}
}
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