FairEmail/app/src/main/java/androidx/recyclerview/widget/RecyclerViewAccessibilityDe...

273 lines
11 KiB
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.recyclerview.widget;
import android.annotation.SuppressLint;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.view.accessibility.AccessibilityEvent;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.core.view.AccessibilityDelegateCompat;
import androidx.core.view.ViewCompat;
import androidx.core.view.accessibility.AccessibilityNodeInfoCompat;
import androidx.core.view.accessibility.AccessibilityNodeProviderCompat;
import java.util.Map;
import java.util.WeakHashMap;
/**
* 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;
private final ItemDelegate mItemDelegate;
public RecyclerViewAccessibilityDelegate(@NonNull RecyclerView recyclerView) {
mRecyclerView = recyclerView;
AccessibilityDelegateCompat itemDelegate = getItemDelegate();
if (itemDelegate != null && itemDelegate instanceof ItemDelegate) {
mItemDelegate = (ItemDelegate) itemDelegate;
} else {
mItemDelegate = new ItemDelegate(this);
}
}
boolean shouldIgnore() {
return mRecyclerView.hasPendingAdapterUpdates();
}
@Override
public boolean performAccessibilityAction(
@SuppressLint("InvalidNullabilityOverride") @NonNull View host,
int action,
@SuppressLint("InvalidNullabilityOverride") @Nullable 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(
@SuppressLint("InvalidNullabilityOverride") @NonNull View host,
@SuppressLint("InvalidNullabilityOverride") @NonNull AccessibilityNodeInfoCompat info
) {
super.onInitializeAccessibilityNodeInfo(host, info);
if (!shouldIgnore() && mRecyclerView.getLayoutManager() != null) {
mRecyclerView.getLayoutManager().onInitializeAccessibilityNodeInfo(info);
}
}
@Override
public void onInitializeAccessibilityEvent(
@SuppressLint("InvalidNullabilityOverride") @NonNull View host,
@SuppressLint("InvalidNullabilityOverride") @NonNull AccessibilityEvent event
) {
super.onInitializeAccessibilityEvent(host, event);
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.
* For now, returning an {@code AccessibilityDelegateCompat} as opposed to an
* {@code ItemDelegate} will prevent use of the {@code ViewCompat} accessibility API on
* item views.
*/
@NonNull
public AccessibilityDelegateCompat getItemDelegate() {
return mItemDelegate;
}
/**
* The default implementation of accessibility delegate for the individual items of the
* RecyclerView.
* <p>
* If you are overriding {@code RecyclerViewAccessibilityDelegate#getItemDelegate()} but still
* want to keep some default behavior, you can create an instance of this class and delegate to
* the parent as necessary.
*/
public static class ItemDelegate extends AccessibilityDelegateCompat {
final RecyclerViewAccessibilityDelegate mRecyclerViewDelegate;
private Map<View, AccessibilityDelegateCompat> mOriginalItemDelegates = new WeakHashMap<>();
/**
* Creates an item delegate for the given {@code RecyclerViewAccessibilityDelegate}.
*
* @param recyclerViewDelegate The parent RecyclerView's accessibility delegate.
*/
public ItemDelegate(@NonNull RecyclerViewAccessibilityDelegate recyclerViewDelegate) {
mRecyclerViewDelegate = recyclerViewDelegate;
}
/**
* Saves a reference to the original delegate of the itemView so that it's behavior can be
* combined with the ItemDelegate's behavior.
*/
void saveOriginalDelegate(View itemView) {
AccessibilityDelegateCompat delegate = ViewCompat.getAccessibilityDelegate(itemView);
if (delegate != null && delegate != this) {
mOriginalItemDelegates.put(itemView, delegate);
}
}
/**
* @return The delegate associated with itemView before the view was bound.
*/
AccessibilityDelegateCompat getAndRemoveOriginalDelegateForItem(View itemView) {
return mOriginalItemDelegates.remove(itemView);
}
@Override
public void onInitializeAccessibilityNodeInfo(
@SuppressLint("InvalidNullabilityOverride") @NonNull View host,
@SuppressLint("InvalidNullabilityOverride") @NonNull
AccessibilityNodeInfoCompat info
) {
if (!mRecyclerViewDelegate.shouldIgnore()
&& mRecyclerViewDelegate.mRecyclerView.getLayoutManager() != null) {
mRecyclerViewDelegate.mRecyclerView.getLayoutManager()
.onInitializeAccessibilityNodeInfoForItem(host, info);
AccessibilityDelegateCompat originalDelegate = mOriginalItemDelegates.get(host);
if (originalDelegate != null) {
originalDelegate.onInitializeAccessibilityNodeInfo(host, info);
} else {
super.onInitializeAccessibilityNodeInfo(host, info);
}
} else {
super.onInitializeAccessibilityNodeInfo(host, info);
}
}
@Override
public boolean performAccessibilityAction(
@SuppressLint("InvalidNullabilityOverride") @NonNull View host,
int action,
@SuppressLint("InvalidNullabilityOverride") @Nullable Bundle args
) {
if (!mRecyclerViewDelegate.shouldIgnore()
&& mRecyclerViewDelegate.mRecyclerView.getLayoutManager() != null) {
AccessibilityDelegateCompat originalDelegate = mOriginalItemDelegates.get(host);
if (originalDelegate != null) {
if (originalDelegate.performAccessibilityAction(host, action, args)) {
return true;
}
} else if (super.performAccessibilityAction(host, action, args)) {
return true;
}
return mRecyclerViewDelegate.mRecyclerView.getLayoutManager()
.performAccessibilityActionForItem(host, action, args);
} else {
return super.performAccessibilityAction(host, action, args);
}
}
@Override
public void sendAccessibilityEvent(@NonNull View host, int eventType) {
AccessibilityDelegateCompat originalDelegate = mOriginalItemDelegates.get(host);
if (originalDelegate != null) {
originalDelegate.sendAccessibilityEvent(host, eventType);
} else {
super.sendAccessibilityEvent(host, eventType);
}
}
@Override
public void sendAccessibilityEventUnchecked(@NonNull View host,
@NonNull AccessibilityEvent event) {
AccessibilityDelegateCompat originalDelegate = mOriginalItemDelegates.get(host);
if (originalDelegate != null) {
originalDelegate.sendAccessibilityEventUnchecked(host, event);
} else {
super.sendAccessibilityEventUnchecked(host, event);
}
}
@Override
public boolean dispatchPopulateAccessibilityEvent(@NonNull View host,
@NonNull AccessibilityEvent event) {
AccessibilityDelegateCompat originalDelegate = mOriginalItemDelegates.get(host);
if (originalDelegate != null) {
return originalDelegate.dispatchPopulateAccessibilityEvent(host, event);
} else {
return super.dispatchPopulateAccessibilityEvent(host, event);
}
}
@Override
public void onPopulateAccessibilityEvent(@NonNull View host,
@NonNull AccessibilityEvent event) {
AccessibilityDelegateCompat originalDelegate = mOriginalItemDelegates.get(host);
if (originalDelegate != null) {
originalDelegate.onPopulateAccessibilityEvent(host, event);
} else {
super.onPopulateAccessibilityEvent(host, event);
}
}
@Override
public void onInitializeAccessibilityEvent(@NonNull View host,
@NonNull AccessibilityEvent event) {
AccessibilityDelegateCompat originalDelegate = mOriginalItemDelegates.get(host);
if (originalDelegate != null) {
originalDelegate.onInitializeAccessibilityEvent(host, event);
} else {
super.onInitializeAccessibilityEvent(host, event);
}
}
@Override
public boolean onRequestSendAccessibilityEvent(@NonNull ViewGroup host,
@NonNull View child, @NonNull AccessibilityEvent event) {
AccessibilityDelegateCompat originalDelegate = mOriginalItemDelegates.get(host);
if (originalDelegate != null) {
return originalDelegate.onRequestSendAccessibilityEvent(host, child, event);
} else {
return super.onRequestSendAccessibilityEvent(host, child, event);
}
}
@Override
@Nullable
public AccessibilityNodeProviderCompat getAccessibilityNodeProvider(@NonNull View host) {
AccessibilityDelegateCompat originalDelegate = mOriginalItemDelegates.get(host);
if (originalDelegate != null) {
return originalDelegate.getAccessibilityNodeProvider(host);
} else {
return super.getAccessibilityNodeProvider(host);
}
}
}
}