1/* 2 * Copyright (C) 2014 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.widget; 18 19import android.os.Bundle; 20import android.support.v4.view.AccessibilityDelegateCompat; 21import android.support.v4.view.accessibility.AccessibilityNodeInfoCompat; 22import android.view.View; 23import android.view.accessibility.AccessibilityEvent; 24 25/** 26 * The AccessibilityDelegate used by RecyclerView. 27 * <p> 28 * This class handles basic accessibility actions and delegates them to LayoutManager. 29 */ 30public class RecyclerViewAccessibilityDelegate extends AccessibilityDelegateCompat { 31 final RecyclerView mRecyclerView; 32 33 34 public RecyclerViewAccessibilityDelegate(RecyclerView recyclerView) { 35 mRecyclerView = recyclerView; 36 } 37 38 @Override 39 public boolean performAccessibilityAction(View host, int action, Bundle args) { 40 if (super.performAccessibilityAction(host, action, args)) { 41 return true; 42 } 43 if (mRecyclerView.getLayoutManager() != null) { 44 return mRecyclerView.getLayoutManager().performAccessibilityAction(action, args); 45 } 46 47 return false; 48 } 49 50 @Override 51 public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfoCompat info) { 52 super.onInitializeAccessibilityNodeInfo(host, info); 53 info.setClassName(RecyclerView.class.getName()); 54 if (mRecyclerView.getLayoutManager() != null) { 55 mRecyclerView.getLayoutManager().onInitializeAccessibilityNodeInfo(info); 56 } 57 } 58 59 @Override 60 public void onInitializeAccessibilityEvent(View host, AccessibilityEvent event) { 61 super.onInitializeAccessibilityEvent(host, event); 62 event.setClassName(RecyclerView.class.getName()); 63 if (host instanceof RecyclerView) { 64 RecyclerView rv = (RecyclerView) host; 65 if (rv.getLayoutManager() != null) { 66 rv.getLayoutManager().onInitializeAccessibilityEvent(event); 67 } 68 } 69 } 70 71 AccessibilityDelegateCompat getItemDelegate() { 72 return mItemDelegate; 73 } 74 75 final AccessibilityDelegateCompat mItemDelegate = new AccessibilityDelegateCompat() { 76 @Override 77 public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfoCompat info) { 78 super.onInitializeAccessibilityNodeInfo(host, info); 79 if (mRecyclerView.getLayoutManager() != null) { 80 mRecyclerView.getLayoutManager(). 81 onInitializeAccessibilityNodeInfoForItem(host, info); 82 } 83 } 84 85 @Override 86 public boolean performAccessibilityAction(View host, int action, Bundle args) { 87 if (super.performAccessibilityAction(host, action, args)) { 88 return true; 89 } 90 if (mRecyclerView.getLayoutManager() != null) { 91 return mRecyclerView.getLayoutManager(). 92 performAccessibilityActionForItem(host, action, args); 93 } 94 return false; 95 } 96 }; 97} 98