preference/src/main/java/androidx/preference/PreferenceCategory.java

/*
 * Copyright 2018 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 androidx.preference;

import android.content.Context;
import android.os.Build;
import android.util.AttributeSet;

import androidx.core.content.res.TypedArrayUtils;
import androidx.core.view.accessibility.AccessibilityNodeInfoCompat;
import androidx.core.view.accessibility.AccessibilityNodeInfoCompat.CollectionItemInfoCompat;

/**
 * Used to group {@link Preference} objects and provide a disabled title above
 * the group.
 *
 * <div class="special reference">
 * <h3>Developer Guides</h3>
 * <p>For information about building a settings UI with Preferences,
 * read the <a href="{@docRoot}guide/topics/ui/settings.html">Settings</a>
 * guide.</p>
 * </div>
 */
public class PreferenceCategory extends PreferenceGroup {

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

    public PreferenceCategory(Context context, AttributeSet attrs, int defStyleAttr) {
        this(context, attrs, defStyleAttr, 0);
    }

    public PreferenceCategory(Context context, AttributeSet attrs) {
        this(context, attrs, TypedArrayUtils.getAttr(context, R.attr.preferenceCategoryStyle,
                android.R.attr.preferenceCategoryStyle));
    }

    public PreferenceCategory(Context context) {
        this(context, null);
    }

    @Override
    public boolean isEnabled() {
        return false;
    }

    @Override
    public boolean shouldDisableDependents() {
        return !super.isEnabled();
    }

    @Override
    public void onBindViewHolder(PreferenceViewHolder holder) {
        super.onBindViewHolder(holder);
        if (Build.VERSION.SDK_INT >= 28) {
            holder.itemView.setAccessibilityHeading(true);
        }
    }

    @Override
    public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfoCompat info) {
        super.onInitializeAccessibilityNodeInfo(info);
        if (Build.VERSION.SDK_INT < 28) {
            CollectionItemInfoCompat existingItemInfo = info.getCollectionItemInfo();
            if (existingItemInfo == null) {
                return;
            }

            final CollectionItemInfoCompat newItemInfo = CollectionItemInfoCompat.obtain(
                    existingItemInfo.getRowIndex(),
                    existingItemInfo.getRowSpan(),
                    existingItemInfo.getColumnIndex(),
                    existingItemInfo.getColumnSpan(),
                    true /* heading */,
                    existingItemInfo.isSelected());
            info.setCollectionItemInfo(newItemInfo);
        }
    }
}