mirror of https://github.com/M66B/FairEmail.git
273 lines
11 KiB
Java
273 lines
11 KiB
Java
/*
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* Copyright 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package androidx.recyclerview.widget;
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import android.annotation.SuppressLint;
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import android.os.Bundle;
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import android.view.View;
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import android.view.ViewGroup;
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import android.view.accessibility.AccessibilityEvent;
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import androidx.annotation.NonNull;
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import androidx.annotation.Nullable;
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import androidx.core.view.AccessibilityDelegateCompat;
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import androidx.core.view.ViewCompat;
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import androidx.core.view.accessibility.AccessibilityNodeInfoCompat;
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import androidx.core.view.accessibility.AccessibilityNodeProviderCompat;
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import java.util.Map;
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import java.util.WeakHashMap;
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/**
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* The AccessibilityDelegate used by RecyclerView.
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* <p>
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* This class handles basic accessibility actions and delegates them to LayoutManager.
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*/
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public class RecyclerViewAccessibilityDelegate extends AccessibilityDelegateCompat {
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final RecyclerView mRecyclerView;
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private final ItemDelegate mItemDelegate;
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public RecyclerViewAccessibilityDelegate(@NonNull RecyclerView recyclerView) {
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mRecyclerView = recyclerView;
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AccessibilityDelegateCompat itemDelegate = getItemDelegate();
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if (itemDelegate != null && itemDelegate instanceof ItemDelegate) {
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mItemDelegate = (ItemDelegate) itemDelegate;
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} else {
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mItemDelegate = new ItemDelegate(this);
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}
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}
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boolean shouldIgnore() {
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return mRecyclerView.hasPendingAdapterUpdates();
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}
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@Override
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public boolean performAccessibilityAction(
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@SuppressLint("InvalidNullabilityOverride") @NonNull View host,
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int action,
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@SuppressLint("InvalidNullabilityOverride") @Nullable Bundle args
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) {
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if (super.performAccessibilityAction(host, action, args)) {
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return true;
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}
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if (!shouldIgnore() && mRecyclerView.getLayoutManager() != null) {
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return mRecyclerView.getLayoutManager().performAccessibilityAction(action, args);
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}
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return false;
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}
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@Override
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public void onInitializeAccessibilityNodeInfo(
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@SuppressLint("InvalidNullabilityOverride") @NonNull View host,
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@SuppressLint("InvalidNullabilityOverride") @NonNull AccessibilityNodeInfoCompat info
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) {
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super.onInitializeAccessibilityNodeInfo(host, info);
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if (!shouldIgnore() && mRecyclerView.getLayoutManager() != null) {
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mRecyclerView.getLayoutManager().onInitializeAccessibilityNodeInfo(info);
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}
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}
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@Override
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public void onInitializeAccessibilityEvent(
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@SuppressLint("InvalidNullabilityOverride") @NonNull View host,
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@SuppressLint("InvalidNullabilityOverride") @NonNull AccessibilityEvent event
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) {
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super.onInitializeAccessibilityEvent(host, event);
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if (host instanceof RecyclerView && !shouldIgnore()) {
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RecyclerView rv = (RecyclerView) host;
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if (rv.getLayoutManager() != null) {
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rv.getLayoutManager().onInitializeAccessibilityEvent(event);
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}
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}
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}
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/**
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* Gets the AccessibilityDelegate for an individual item in the RecyclerView.
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* A basic item delegate is provided by default, but you can override this
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* method to provide a custom per-item delegate.
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* For now, returning an {@code AccessibilityDelegateCompat} as opposed to an
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* {@code ItemDelegate} will prevent use of the {@code ViewCompat} accessibility API on
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* item views.
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*/
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@NonNull
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public AccessibilityDelegateCompat getItemDelegate() {
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return mItemDelegate;
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}
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/**
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* The default implementation of accessibility delegate for the individual items of the
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* RecyclerView.
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* <p>
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* If you are overriding {@code RecyclerViewAccessibilityDelegate#getItemDelegate()} but still
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* want to keep some default behavior, you can create an instance of this class and delegate to
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* the parent as necessary.
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*/
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public static class ItemDelegate extends AccessibilityDelegateCompat {
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final RecyclerViewAccessibilityDelegate mRecyclerViewDelegate;
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private Map<View, AccessibilityDelegateCompat> mOriginalItemDelegates = new WeakHashMap<>();
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/**
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* Creates an item delegate for the given {@code RecyclerViewAccessibilityDelegate}.
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*
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* @param recyclerViewDelegate The parent RecyclerView's accessibility delegate.
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*/
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public ItemDelegate(@NonNull RecyclerViewAccessibilityDelegate recyclerViewDelegate) {
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mRecyclerViewDelegate = recyclerViewDelegate;
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}
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/**
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* Saves a reference to the original delegate of the itemView so that it's behavior can be
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* combined with the ItemDelegate's behavior.
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*/
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void saveOriginalDelegate(View itemView) {
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AccessibilityDelegateCompat delegate = ViewCompat.getAccessibilityDelegate(itemView);
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if (delegate != null && delegate != this) {
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mOriginalItemDelegates.put(itemView, delegate);
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}
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}
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/**
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* @return The delegate associated with itemView before the view was bound.
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*/
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AccessibilityDelegateCompat getAndRemoveOriginalDelegateForItem(View itemView) {
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return mOriginalItemDelegates.remove(itemView);
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}
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@Override
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public void onInitializeAccessibilityNodeInfo(
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@SuppressLint("InvalidNullabilityOverride") @NonNull View host,
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@SuppressLint("InvalidNullabilityOverride") @NonNull
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AccessibilityNodeInfoCompat info
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) {
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if (!mRecyclerViewDelegate.shouldIgnore()
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&& mRecyclerViewDelegate.mRecyclerView.getLayoutManager() != null) {
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mRecyclerViewDelegate.mRecyclerView.getLayoutManager()
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.onInitializeAccessibilityNodeInfoForItem(host, info);
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AccessibilityDelegateCompat originalDelegate = mOriginalItemDelegates.get(host);
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if (originalDelegate != null) {
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originalDelegate.onInitializeAccessibilityNodeInfo(host, info);
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} else {
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super.onInitializeAccessibilityNodeInfo(host, info);
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}
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} else {
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super.onInitializeAccessibilityNodeInfo(host, info);
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}
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}
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@Override
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public boolean performAccessibilityAction(
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@SuppressLint("InvalidNullabilityOverride") @NonNull View host,
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int action,
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@SuppressLint("InvalidNullabilityOverride") @Nullable Bundle args
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) {
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if (!mRecyclerViewDelegate.shouldIgnore()
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&& mRecyclerViewDelegate.mRecyclerView.getLayoutManager() != null) {
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AccessibilityDelegateCompat originalDelegate = mOriginalItemDelegates.get(host);
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if (originalDelegate != null) {
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if (originalDelegate.performAccessibilityAction(host, action, args)) {
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return true;
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}
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} else if (super.performAccessibilityAction(host, action, args)) {
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return true;
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}
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return mRecyclerViewDelegate.mRecyclerView.getLayoutManager()
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.performAccessibilityActionForItem(host, action, args);
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} else {
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return super.performAccessibilityAction(host, action, args);
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}
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}
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@Override
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public void sendAccessibilityEvent(@NonNull View host, int eventType) {
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AccessibilityDelegateCompat originalDelegate = mOriginalItemDelegates.get(host);
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if (originalDelegate != null) {
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originalDelegate.sendAccessibilityEvent(host, eventType);
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} else {
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super.sendAccessibilityEvent(host, eventType);
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}
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}
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@Override
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public void sendAccessibilityEventUnchecked(@NonNull View host,
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@NonNull AccessibilityEvent event) {
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AccessibilityDelegateCompat originalDelegate = mOriginalItemDelegates.get(host);
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if (originalDelegate != null) {
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originalDelegate.sendAccessibilityEventUnchecked(host, event);
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} else {
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super.sendAccessibilityEventUnchecked(host, event);
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}
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}
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@Override
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public boolean dispatchPopulateAccessibilityEvent(@NonNull View host,
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@NonNull AccessibilityEvent event) {
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AccessibilityDelegateCompat originalDelegate = mOriginalItemDelegates.get(host);
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if (originalDelegate != null) {
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return originalDelegate.dispatchPopulateAccessibilityEvent(host, event);
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} else {
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return super.dispatchPopulateAccessibilityEvent(host, event);
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}
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}
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@Override
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public void onPopulateAccessibilityEvent(@NonNull View host,
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@NonNull AccessibilityEvent event) {
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AccessibilityDelegateCompat originalDelegate = mOriginalItemDelegates.get(host);
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if (originalDelegate != null) {
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originalDelegate.onPopulateAccessibilityEvent(host, event);
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} else {
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super.onPopulateAccessibilityEvent(host, event);
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}
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}
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@Override
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public void onInitializeAccessibilityEvent(@NonNull View host,
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@NonNull AccessibilityEvent event) {
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AccessibilityDelegateCompat originalDelegate = mOriginalItemDelegates.get(host);
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if (originalDelegate != null) {
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originalDelegate.onInitializeAccessibilityEvent(host, event);
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} else {
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super.onInitializeAccessibilityEvent(host, event);
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}
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}
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@Override
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public boolean onRequestSendAccessibilityEvent(@NonNull ViewGroup host,
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@NonNull View child, @NonNull AccessibilityEvent event) {
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AccessibilityDelegateCompat originalDelegate = mOriginalItemDelegates.get(host);
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if (originalDelegate != null) {
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return originalDelegate.onRequestSendAccessibilityEvent(host, child, event);
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} else {
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return super.onRequestSendAccessibilityEvent(host, child, event);
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}
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}
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@Override
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@Nullable
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public AccessibilityNodeProviderCompat getAccessibilityNodeProvider(@NonNull View host) {
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AccessibilityDelegateCompat originalDelegate = mOriginalItemDelegates.get(host);
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if (originalDelegate != null) {
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return originalDelegate.getAccessibilityNodeProvider(host);
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} else {
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return super.getAccessibilityNodeProvider(host);
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}
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}
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}
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}
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