1/* 2 * Copyright (C) 2016 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License 15 */ 16 17package android.support.v7.preference; 18 19import android.os.Bundle; 20import android.support.annotation.RestrictTo; 21import android.support.v4.view.AccessibilityDelegateCompat; 22import android.support.v4.view.accessibility.AccessibilityNodeInfoCompat; 23import android.support.v7.widget.RecyclerView; 24import android.support.v7.widget.RecyclerViewAccessibilityDelegate; 25import android.view.View; 26import android.view.accessibility.AccessibilityEvent; 27 28import static android.support.annotation.RestrictTo.Scope.GROUP_ID; 29 30/** 31 * The AccessibilityDelegate used by the RecyclerView that displays Views for Preferences. 32 * 33 * @hide 34 */ 35@RestrictTo(GROUP_ID) 36public class PreferenceRecyclerViewAccessibilityDelegate 37 extends RecyclerViewAccessibilityDelegate { 38 final RecyclerView mRecyclerView; 39 final AccessibilityDelegateCompat mDefaultItemDelegate = super.getItemDelegate(); 40 41 public PreferenceRecyclerViewAccessibilityDelegate(RecyclerView recyclerView) { 42 super(recyclerView); 43 mRecyclerView = recyclerView; 44 } 45 46 @Override 47 public AccessibilityDelegateCompat getItemDelegate() { 48 return mItemDelegate; 49 } 50 51 final AccessibilityDelegateCompat mItemDelegate = new AccessibilityDelegateCompat() { 52 @Override 53 public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfoCompat info) { 54 mDefaultItemDelegate.onInitializeAccessibilityNodeInfo(host, info); 55 int position = mRecyclerView.getChildAdapterPosition(host); 56 57 RecyclerView.Adapter adapter = mRecyclerView.getAdapter(); 58 if (!(adapter instanceof PreferenceGroupAdapter)) { 59 return; 60 } 61 62 PreferenceGroupAdapter preferenceGroupAdapter = (PreferenceGroupAdapter) adapter; 63 Preference preference = preferenceGroupAdapter.getItem(position); 64 if (preference == null) { 65 return; 66 } 67 68 preference.onInitializeAccessibilityNodeInfo(info); 69 } 70 71 @Override 72 public boolean performAccessibilityAction(View host, int action, Bundle args) { 73 // Must forward actions since the default delegate will handle actions. 74 return mDefaultItemDelegate.performAccessibilityAction(host, action, args); 75 } 76 }; 77} 78