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/*
* Copyright (C) 2017 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.internal.widget;
import android.os.Bundle;
import android.view.View;
import android.view.View.AccessibilityDelegate;
import android.view.accessibility.AccessibilityEvent;
import android.view.accessibility.AccessibilityNodeInfo;
/**
* The AccessibilityDelegate used by RecyclerView.
* <p>
* This class handles basic accessibility actions and delegates them to LayoutManager.
*/
public class RecyclerViewAccessibilityDelegate extends AccessibilityDelegate {
final RecyclerView mRecyclerView;
public RecyclerViewAccessibilityDelegate(RecyclerView recyclerView) {
mRecyclerView = recyclerView;
}
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, AccessibilityNodeInfo 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);
}
}
}
/**
* Gets the AccessibilityDelegate for an individual item in the RecyclerView.
* A basic item delegate is provided by default, but you can override this
* method to provide a custom per-item delegate.
*/
public AccessibilityDelegate getItemDelegate() {
return mItemDelegate;
}
final AccessibilityDelegate mItemDelegate = new AccessibilityDelegate() {
@Override
public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfo 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;
}
};
}
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