/* * Copyright (C) 2014 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 android.support.v7.widget; import android.os.Bundle; import android.support.v4.view.AccessibilityDelegateCompat; import android.support.v4.view.accessibility.AccessibilityNodeInfoCompat; import android.view.View; import android.view.accessibility.AccessibilityEvent; /** * The AccessibilityDelegate used by RecyclerView. * <p> * This class handles basic accessibility actions and delegates them to LayoutManager. */ public class RecyclerViewAccessibilityDelegate extends AccessibilityDelegateCompat { final RecyclerView mRecyclerView; public RecyclerViewAccessibilityDelegate(RecyclerView recyclerView) { mRecyclerView = recyclerView; } private boolean shouldIgnore() { return mRecyclerView.hasPendingAdapterUpdates(); } @Override public boolean performAccessibilityAction(View host, int action, Bundle args) { if (super.performAccessibilityAction(host, action, args)) { return true; } if (!shouldIgnore() && mRecyclerView.getLayoutManager() != null) { return mRecyclerView.getLayoutManager().performAccessibilityAction(action, args); } return false; } @Override public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfoCompat info) { super.onInitializeAccessibilityNodeInfo(host, info); info.setClassName(RecyclerView.class.getName()); if (!shouldIgnore() && mRecyclerView.getLayoutManager() != null) { mRecyclerView.getLayoutManager().onInitializeAccessibilityNodeInfo(info); } } @Override public void onInitializeAccessibilityEvent(View host, AccessibilityEvent event) { super.onInitializeAccessibilityEvent(host, event); event.setClassName(RecyclerView.class.getName()); if (host instanceof RecyclerView && !shouldIgnore()) { RecyclerView rv = (RecyclerView) host; if (rv.getLayoutManager() != null) { rv.getLayoutManager().onInitializeAccessibilityEvent(event); } } } AccessibilityDelegateCompat getItemDelegate() { return mItemDelegate; } final AccessibilityDelegateCompat mItemDelegate = new AccessibilityDelegateCompat() { @Override public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfoCompat info) { super.onInitializeAccessibilityNodeInfo(host, info); if (!shouldIgnore() && mRecyclerView.getLayoutManager() != null) { mRecyclerView.getLayoutManager(). onInitializeAccessibilityNodeInfoForItem(host, info); } } @Override public boolean performAccessibilityAction(View host, int action, Bundle args) { if (super.performAccessibilityAction(host, action, args)) { return true; } if (!shouldIgnore() && mRecyclerView.getLayoutManager() != null) { return mRecyclerView.getLayoutManager(). performAccessibilityActionForItem(host, action, args); } return false; } }; }