src/com/android/car/settings/common/ColoredSwitchPreference.java

/*
 * Copyright (C) 2020 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.car.settings.common;

import android.content.Context;
import android.content.res.ColorStateList;
import android.content.res.TypedArray;
import android.text.TextUtils;
import android.util.AttributeSet;
import android.widget.TextView;

import androidx.preference.PreferenceViewHolder;

import com.android.car.settings.R;
import com.android.car.ui.preference.CarUiPrimarySwitchPreference;
import com.android.settingslib.Utils;

/**
 * Extends {@link CarUiPrimarySwitchPreference} to customize colors for each state.
 */
// TODO(242221289): Remove ColoredSwitchPreference once contentDescription is
// added to chassis preferences
public class ColoredSwitchPreference extends CarUiPrimarySwitchPreference {
    private ColorStateList mEnabledColor;
    private ColorStateList mDisabledColor;
    private String mContentDescription;

    public ColoredSwitchPreference(Context context, AttributeSet attrs,
            int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);
        init(context, attrs);
    }

    public ColoredSwitchPreference(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init(context, attrs);
    }

    public ColoredSwitchPreference(Context context, AttributeSet attrs) {
        super(context, attrs);
        init(context, attrs);
    }

    public ColoredSwitchPreference(Context context) {
        super(context);
        init(context, /* attrs= */ null);
    }

    private void init(Context context, AttributeSet attrs) {
        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.ColoredSwitchPreference);
        mDisabledColor = a.getColorStateList(
                R.styleable.ColoredSwitchPreference_disabledTitleColor);
        if (mDisabledColor == null) {
            mDisabledColor = Utils.getColorAttr(context, android.R.attr.textColorPrimary);
        }
        mEnabledColor = a.getColorStateList(R.styleable.ColoredSwitchPreference_enabledTitleColor);
        if (mEnabledColor == null) {
            mEnabledColor = Utils.getColorAttr(context, android.R.attr.textColorPrimary);
        }
    }

    @Override
    public void onBindViewHolder(PreferenceViewHolder holder) {
        super.onBindViewHolder(holder);
        if (!TextUtils.isEmpty(mContentDescription)) {
            holder.itemView.setContentDescription(mContentDescription);
        }
        TextView title = holder.itemView.findViewById(android.R.id.title);
        if (title != null) {
            if (isChecked()) {
                title.setTextColor(mEnabledColor);
            } else {
                title.setTextColor(mDisabledColor);
            }
        }
    }

    /**
     * Set a content description for the preference. This is mainly for accessibility or
     * UI Automation purposes.
     */
    public void setContentDescription(String contentDescription) {
        mContentDescription = contentDescription;
        notifyChanged();
    }
}