93 lines
3.7 KiB
Java
93 lines
3.7 KiB
Java
/*
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* Copyright (C) 2022 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 com.android.internal.app;
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import android.annotation.NonNull;
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import android.graphics.Rect;
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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 com.android.internal.widget.RecyclerView;
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import com.android.internal.widget.RecyclerViewAccessibilityDelegate;
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class ChooserRecyclerViewAccessibilityDelegate extends RecyclerViewAccessibilityDelegate {
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private final Rect mTempRect = new Rect();
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private final int[] mConsumed = new int[2];
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ChooserRecyclerViewAccessibilityDelegate(RecyclerView recyclerView) {
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super(recyclerView);
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}
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@Override
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public boolean onRequestSendAccessibilityEvent(
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@NonNull ViewGroup host,
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@NonNull View view,
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@NonNull AccessibilityEvent event) {
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boolean result = super.onRequestSendAccessibilityEvent(host, view, event);
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if (result && event.getEventType() == AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED) {
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ensureViewOnScreenVisibility((RecyclerView) host, view);
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}
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return result;
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}
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/**
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* Bring the view that received accessibility focus on the screen.
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* The method's logic is based on a model where RecyclerView is a child of another scrollable
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* component (ResolverDrawerLayout) and can be partially scrolled off the screen. In that case,
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* RecyclerView's children that are positioned fully within RecyclerView bounds but scrolled
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* out of the screen by the outer component, when selected by the accessibility navigation will
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* remain off the screen (as neither components detect such specific case).
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* If the view that receiving accessibility focus is scrolled of the screen, perform the nested
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* scrolling to make in visible.
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*/
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private void ensureViewOnScreenVisibility(RecyclerView recyclerView, View view) {
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View child = recyclerView.findContainingItemView(view);
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if (child == null) {
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return;
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}
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recyclerView.getBoundsOnScreen(mTempRect, true);
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int recyclerOnScreenTop = mTempRect.top;
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int recyclerOnScreenBottom = mTempRect.bottom;
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child.getBoundsOnScreen(mTempRect);
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int dy = 0;
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// if needed, do the page-length scroll instead of just a row-length scroll as
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// ResolverDrawerLayout snaps to the compact view and the row-length scroll can be snapped
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// back right away.
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if (mTempRect.top < recyclerOnScreenTop) {
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// snap to the bottom
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dy = mTempRect.bottom - recyclerOnScreenBottom;
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} else if (mTempRect.bottom > recyclerOnScreenBottom) {
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// snap to the top
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dy = mTempRect.top - recyclerOnScreenTop;
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}
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nestedVerticalScrollBy(recyclerView, dy);
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}
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private void nestedVerticalScrollBy(RecyclerView recyclerView, int dy) {
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if (dy == 0) {
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return;
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}
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recyclerView.startNestedScroll(View.SCROLL_AXIS_VERTICAL);
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if (recyclerView.dispatchNestedPreScroll(0, dy, mConsumed, null)) {
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dy -= mConsumed[1];
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}
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recyclerView.scrollBy(0, dy);
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recyclerView.stopNestedScroll();
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}
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}
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