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/*
* Copyright (C) 2020 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.wallpaper.widget;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.view.accessibility.AccessibilityEvent;
import androidx.core.view.accessibility.AccessibilityNodeInfoCompat;
import androidx.recyclerview.widget.RecyclerView;
import androidx.recyclerview.widget.RecyclerViewAccessibilityDelegate;
import com.google.android.material.bottomsheet.BottomSheetBehavior;
/**
* An AccessibilityDelegate class used to fix some RecyclerView-related Talkback issues.
* <p>
* This is to fix a bug which TalkBack can't visit all wallpaper category/wallpaper items.
*/
public class WallpaperPickerRecyclerViewAccessibilityDelegate
extends RecyclerViewAccessibilityDelegate {
/**
* Interface to be implemented by an Fragment hosting a
* {@link WallpaperPickerRecyclerViewAccessibilityDelegate}
*/
public interface BottomSheetHost {
/**
* Expands the bottom sheet if it's not expanded.
*/
void expandBottomSheet();
/**
* Gets bottom sheet current state.
*/
int getBottomSheetState();
/** Returns {@code true} if the bottom sheet is expanded. */
default boolean isExpanded() {
return getBottomSheetState() == BottomSheetBehavior.STATE_EXPANDED;
}
}
private final RecyclerView mGridRecyclerView;
private final BottomSheetHost mBottomSheetHost;
private final int mColumns;
public WallpaperPickerRecyclerViewAccessibilityDelegate(
RecyclerView recyclerView, BottomSheetHost bottomSheetHost, int columns) {
super(recyclerView);
mGridRecyclerView = recyclerView;
mBottomSheetHost = bottomSheetHost;
mColumns = columns;
}
@Override
public boolean onRequestSendAccessibilityEvent(
ViewGroup host, View child, AccessibilityEvent event) {
if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED) {
int itemPos = mGridRecyclerView.getChildLayoutPosition(child);
// Expand the bottom sheet when TB travel to second column.
if (mBottomSheetHost != null && !mBottomSheetHost.isExpanded()
&& itemPos >= mColumns) {
mBottomSheetHost.expandBottomSheet();
}
}
return super.onRequestSendAccessibilityEvent(host, child, event);
}
@Override
public boolean performAccessibilityAction(View host, int action, Bundle args) {
// Expand the bottom sheet when Switch Access scrolls down grid category.
if (action == AccessibilityNodeInfoCompat.ACTION_SCROLL_FORWARD) {
if (mBottomSheetHost != null && !mBottomSheetHost.isExpanded()) {
mBottomSheetHost.expandBottomSheet();
}
}
return super.performAccessibilityAction(host, action, args);
}
}