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618 lines
24 KiB
Java
618 lines
24 KiB
Java
// Copyright 2013 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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package io.flutter.view;
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import android.graphics.Rect;
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import android.opengl.Matrix;
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import android.os.Bundle;
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import android.util.Log;
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import android.view.View;
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import android.view.accessibility.AccessibilityEvent;
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import android.view.accessibility.AccessibilityNodeInfo;
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import android.view.accessibility.AccessibilityNodeProvider;
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import io.flutter.plugin.common.BasicMessageChannel;
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import io.flutter.plugin.common.StandardMessageCodec;
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import java.nio.ByteBuffer;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.Collections;
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import java.util.Comparator;
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import java.util.HashMap;
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import java.util.HashSet;
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import java.util.Iterator;
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import java.util.List;
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import java.util.Map;
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import java.util.Set;
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class AccessibilityBridge extends AccessibilityNodeProvider implements BasicMessageChannel.MessageHandler<Object> {
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private static final String TAG = "FlutterView";
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private Map<Integer, SemanticsObject> mObjects;
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private final FlutterView mOwner;
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private boolean mAccessibilityEnabled = false;
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private SemanticsObject mFocusedObject;
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private SemanticsObject mHoveredObject;
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private final BasicMessageChannel<Object> mFlutterAccessibilityChannel;
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private static final int SEMANTICS_ACTION_TAP = 1 << 0;
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private static final int SEMANTICS_ACTION_LONG_PRESS = 1 << 1;
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private static final int SEMANTICS_ACTION_SCROLL_LEFT = 1 << 2;
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private static final int SEMANTICS_ACTION_SCROLL_RIGHT = 1 << 3;
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private static final int SEMANTICS_ACTION_SCROLL_UP = 1 << 4;
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private static final int SEMANTICS_ACTION_SCROLL_DOWN = 1 << 5;
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private static final int SEMANTICS_ACTION_INCREASE = 1 << 6;
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private static final int SEMANTICS_ACTION_DECREASE = 1 << 7;
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private static final int SEMANTICS_ACTION_SHOW_ON_SCREEN = 1 << 8;
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private static final int SEMANTICS_ACTION_SCROLLABLE = SEMANTICS_ACTION_SCROLL_LEFT |
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SEMANTICS_ACTION_SCROLL_RIGHT |
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SEMANTICS_ACTION_SCROLL_UP |
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SEMANTICS_ACTION_SCROLL_DOWN;
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private static final int SEMANTICS_FLAG_HAS_CHECKED_STATE = 1 << 0;
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private static final int SEMANTICS_FLAG_IS_CHECKED = 1 << 1;
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private static final int SEMANTICS_FLAG_IS_SELECTED = 1 << 2;
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AccessibilityBridge(FlutterView owner) {
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assert owner != null;
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mOwner = owner;
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mObjects = new HashMap<Integer, SemanticsObject>();
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mFlutterAccessibilityChannel = new BasicMessageChannel<>(owner, "flutter/accessibility",
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StandardMessageCodec.INSTANCE);
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}
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void setAccessibilityEnabled(boolean accessibilityEnabled) {
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mAccessibilityEnabled = accessibilityEnabled;
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if (accessibilityEnabled) {
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mFlutterAccessibilityChannel.setMessageHandler(this);
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} else {
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mFlutterAccessibilityChannel.setMessageHandler(null);
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}
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}
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@Override
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@SuppressWarnings("deprecation")
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public AccessibilityNodeInfo createAccessibilityNodeInfo(int virtualViewId) {
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if (virtualViewId == View.NO_ID) {
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AccessibilityNodeInfo result = AccessibilityNodeInfo.obtain(mOwner);
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mOwner.onInitializeAccessibilityNodeInfo(result);
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if (mObjects.containsKey(0))
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result.addChild(mOwner, 0);
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return result;
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}
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SemanticsObject object = mObjects.get(virtualViewId);
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if (object == null)
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return null;
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AccessibilityNodeInfo result = AccessibilityNodeInfo.obtain(mOwner, virtualViewId);
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result.setPackageName(mOwner.getContext().getPackageName());
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result.setClassName("Flutter"); // TODO(goderbauer): Set proper class names
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result.setSource(mOwner, virtualViewId);
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result.setFocusable(object.isFocusable());
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if (object.parent != null) {
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assert object.id > 0;
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result.setParent(mOwner, object.parent.id);
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} else {
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assert object.id == 0;
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result.setParent(mOwner);
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}
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Rect bounds = object.getGlobalRect();
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if (object.parent != null) {
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Rect parentBounds = object.parent.getGlobalRect();
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Rect boundsInParent = new Rect(bounds);
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boundsInParent.offset(-parentBounds.left, -parentBounds.top);
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result.setBoundsInParent(boundsInParent);
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} else {
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result.setBoundsInParent(bounds);
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}
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result.setBoundsInScreen(bounds);
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result.setVisibleToUser(true);
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result.setEnabled(true); // TODO(ianh): Expose disabled subtrees
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if ((object.actions & SEMANTICS_ACTION_TAP) != 0) {
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result.addAction(AccessibilityNodeInfo.ACTION_CLICK);
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result.setClickable(true);
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}
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if ((object.actions & SEMANTICS_ACTION_LONG_PRESS) != 0) {
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result.addAction(AccessibilityNodeInfo.ACTION_LONG_CLICK);
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result.setLongClickable(true);
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}
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if ((object.actions & SEMANTICS_ACTION_SCROLLABLE) != 0) {
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result.setScrollable(true);
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// This tells Android's a11y to send scroll events when reaching the end of
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// the visible viewport of a scrollable.
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result.setClassName("android.widget.ScrollView");
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// TODO(ianh): Once we're on SDK v23+, call addAction to
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// expose AccessibilityAction.ACTION_SCROLL_LEFT, _RIGHT,
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// _UP, and _DOWN when appropriate.
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if ((object.actions & SEMANTICS_ACTION_SCROLL_LEFT) != 0
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|| (object.actions & SEMANTICS_ACTION_SCROLL_UP) != 0) {
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result.addAction(AccessibilityNodeInfo.ACTION_SCROLL_FORWARD);
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}
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if ((object.actions & SEMANTICS_ACTION_SCROLL_RIGHT) != 0
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|| (object.actions & SEMANTICS_ACTION_SCROLL_DOWN) != 0) {
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result.addAction(AccessibilityNodeInfo.ACTION_SCROLL_BACKWARD);
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}
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}
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if ((object.actions & SEMANTICS_ACTION_INCREASE) != 0
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|| (object.actions & SEMANTICS_ACTION_DECREASE) != 0 ) {
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result.setClassName("android.widget.SeekBar");
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if ((object.actions & SEMANTICS_ACTION_INCREASE) != 0) {
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result.addAction(AccessibilityNodeInfo.ACTION_SCROLL_FORWARD);
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}
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if ((object.actions & SEMANTICS_ACTION_DECREASE) != 0) {
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result.addAction(AccessibilityNodeInfo.ACTION_SCROLL_BACKWARD);
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}
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}
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result.setCheckable((object.flags & SEMANTICS_FLAG_HAS_CHECKED_STATE) != 0);
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result.setChecked((object.flags & SEMANTICS_FLAG_IS_CHECKED) != 0);
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result.setSelected((object.flags & SEMANTICS_FLAG_IS_SELECTED) != 0);
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result.setText(object.label);
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// Accessibility Focus
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if (mFocusedObject != null && mFocusedObject.id == virtualViewId) {
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result.addAction(AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS);
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} else {
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result.addAction(AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS);
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}
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if (object.children != null) {
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List<SemanticsObject> childrenInTraversalOrder =
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new ArrayList<SemanticsObject>(object.children);
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Collections.sort(childrenInTraversalOrder, new Comparator<SemanticsObject>() {
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public int compare(SemanticsObject a, SemanticsObject b) {
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final int top = Integer.compare(a.globalRect.top, b.globalRect.top);
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// TODO(goderbauer): sort right-to-left in rtl environments.
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return top == 0 ? Integer.compare(a.globalRect.left, b.globalRect.left) : top;
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}
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});
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for (SemanticsObject child : childrenInTraversalOrder) {
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result.addChild(mOwner, child.id);
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}
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}
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return result;
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}
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@Override
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public boolean performAction(int virtualViewId, int action, Bundle arguments) {
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SemanticsObject object = mObjects.get(virtualViewId);
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if (object == null) {
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return false;
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}
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switch (action) {
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case AccessibilityNodeInfo.ACTION_CLICK: {
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mOwner.dispatchSemanticsAction(virtualViewId, SEMANTICS_ACTION_TAP);
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return true;
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}
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case AccessibilityNodeInfo.ACTION_LONG_CLICK: {
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mOwner.dispatchSemanticsAction(virtualViewId, SEMANTICS_ACTION_LONG_PRESS);
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return true;
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}
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case AccessibilityNodeInfo.ACTION_SCROLL_FORWARD: {
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if ((object.actions & SEMANTICS_ACTION_SCROLL_UP) != 0) {
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mOwner.dispatchSemanticsAction(virtualViewId, SEMANTICS_ACTION_SCROLL_UP);
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} else if ((object.actions & SEMANTICS_ACTION_SCROLL_LEFT) != 0) {
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// TODO(ianh): bidi support using textDirection
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mOwner.dispatchSemanticsAction(virtualViewId, SEMANTICS_ACTION_SCROLL_LEFT);
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} else if ((object.actions & SEMANTICS_ACTION_INCREASE) != 0) {
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mOwner.dispatchSemanticsAction(virtualViewId, SEMANTICS_ACTION_INCREASE);
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} else {
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return false;
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}
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return true;
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}
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case AccessibilityNodeInfo.ACTION_SCROLL_BACKWARD: {
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if ((object.actions & SEMANTICS_ACTION_SCROLL_DOWN) != 0) {
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mOwner.dispatchSemanticsAction(virtualViewId, SEMANTICS_ACTION_SCROLL_DOWN);
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} else if ((object.actions & SEMANTICS_ACTION_SCROLL_RIGHT) != 0) {
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// TODO(ianh): bidi support using textDirection
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mOwner.dispatchSemanticsAction(virtualViewId, SEMANTICS_ACTION_SCROLL_RIGHT);
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} else if ((object.actions & SEMANTICS_ACTION_DECREASE) != 0) {
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mOwner.dispatchSemanticsAction(virtualViewId, SEMANTICS_ACTION_DECREASE);
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} else {
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return false;
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}
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return true;
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}
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case AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS: {
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sendAccessibilityEvent(virtualViewId, AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED);
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mFocusedObject = null;
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return true;
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}
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case AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS: {
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sendAccessibilityEvent(virtualViewId, AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED);
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if (mFocusedObject == null) {
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// When Android focuses a node, it doesn't invalidate the view.
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// (It does when it sends ACTION_CLEAR_ACCESSIBILITY_FOCUS, so
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// we only have to worry about this when the focused node is null.)
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mOwner.invalidate();
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}
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mFocusedObject = object;
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return true;
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}
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// TODO(goderbauer): Use ACTION_SHOW_ON_SCREEN from Android Support Library after
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// https://github.com/flutter/flutter/issues/11099 is resolved.
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case 16908342: { // ACTION_SHOW_ON_SCREEN, added in API level 23
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mOwner.dispatchSemanticsAction(virtualViewId, SEMANTICS_ACTION_SHOW_ON_SCREEN);
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return true;
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}
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}
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return false;
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}
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// TODO(ianh): implement findAccessibilityNodeInfosByText()
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// TODO(ianh): implement findFocus()
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private SemanticsObject getRootObject() {
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assert mObjects.containsKey(0);
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return mObjects.get(0);
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}
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private SemanticsObject getOrCreateObject(int id) {
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SemanticsObject object = mObjects.get(id);
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if (object == null) {
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object = new SemanticsObject();
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object.id = id;
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mObjects.put(id, object);
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}
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return object;
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}
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void handleTouchExplorationExit() {
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if (mHoveredObject != null) {
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sendAccessibilityEvent(mHoveredObject.id, AccessibilityEvent.TYPE_VIEW_HOVER_EXIT);
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mHoveredObject = null;
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}
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}
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void handleTouchExploration(float x, float y) {
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if (mObjects.isEmpty()) {
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return;
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}
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SemanticsObject newObject = getRootObject().hitTest(new float[]{ x, y, 0, 1 });
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if (newObject != mHoveredObject) {
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// sending ENTER before EXIT is how Android wants it
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if (newObject != null) {
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sendAccessibilityEvent(newObject.id, AccessibilityEvent.TYPE_VIEW_HOVER_ENTER);
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}
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if (mHoveredObject != null) {
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sendAccessibilityEvent(mHoveredObject.id, AccessibilityEvent.TYPE_VIEW_HOVER_EXIT);
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}
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mHoveredObject = newObject;
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}
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}
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void updateSemantics(ByteBuffer buffer, String[] strings) {
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ArrayList<Integer> updated = new ArrayList<Integer>();
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while (buffer.hasRemaining()) {
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int id = buffer.getInt();
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getOrCreateObject(id).updateWith(buffer, strings);
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updated.add(id);
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}
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Set<SemanticsObject> visitedObjects = new HashSet<SemanticsObject>();
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SemanticsObject rootObject = getRootObject();
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if (rootObject != null) {
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final float[] identity = new float[16];
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Matrix.setIdentityM(identity, 0);
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rootObject.updateRecursively(identity, visitedObjects, false);
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}
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Iterator<Map.Entry<Integer, SemanticsObject>> it = mObjects.entrySet().iterator();
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while (it.hasNext()) {
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Map.Entry<Integer, SemanticsObject> entry = it.next();
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SemanticsObject object = entry.getValue();
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if (!visitedObjects.contains(object)) {
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willRemoveSemanticsObject(object);
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it.remove();
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}
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}
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for (Integer id : updated) {
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sendAccessibilityEvent(id, AccessibilityEvent.TYPE_WINDOW_CONTENT_CHANGED);
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}
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}
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private AccessibilityEvent obtainAccessibilityEvent(int virtualViewId, int eventType) {
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assert virtualViewId != 0;
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AccessibilityEvent event = AccessibilityEvent.obtain(eventType);
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event.setPackageName(mOwner.getContext().getPackageName());
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event.setSource(mOwner, virtualViewId);
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return event;
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}
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private void sendAccessibilityEvent(int virtualViewId, int eventType) {
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if (!mAccessibilityEnabled) {
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return;
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}
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if (virtualViewId == 0) {
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mOwner.sendAccessibilityEvent(eventType);
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} else {
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sendAccessibilityEvent(obtainAccessibilityEvent(virtualViewId, eventType));
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}
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}
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private void sendAccessibilityEvent(AccessibilityEvent event) {
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if (!mAccessibilityEnabled) {
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return;
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}
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mOwner.getParent().requestSendAccessibilityEvent(mOwner, event);
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}
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// Message Handler for [mFlutterAccessibilityChannel].
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public void onMessage(Object message, BasicMessageChannel.Reply<Object> reply) {
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@SuppressWarnings("unchecked")
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final HashMap<String, Object> annotatedEvent = (HashMap<String, Object>)message;
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final String type = (String)annotatedEvent.get("type");
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@SuppressWarnings("unchecked")
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final HashMap<String, Object> data = (HashMap<String, Object>)annotatedEvent.get("data");
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switch (type) {
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case "scroll":
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final int nodeId = (int)annotatedEvent.get("nodeId");
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AccessibilityEvent event =
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obtainAccessibilityEvent(nodeId, AccessibilityEvent.TYPE_VIEW_SCROLLED);
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char axis = ((String)data.get("axis")).charAt(0);
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double minPosition = (double)data.get("minScrollExtent");
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double maxPosition = (double)data.get("maxScrollExtent") - minPosition;
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double position = (double)data.get("pixels") - minPosition;
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if (axis == 'v') {
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event.setScrollY((int)position);
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event.setMaxScrollY((int)maxPosition);
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} else {
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assert axis == 'h';
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event.setScrollX((int)position);
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event.setMaxScrollX((int)maxPosition);
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}
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sendAccessibilityEvent(event);
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break;
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case "announce":
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mOwner.announceForAccessibility((String) data.get("message"));
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break;
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default:
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assert false;
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}
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}
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private void willRemoveSemanticsObject(SemanticsObject object) {
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assert mObjects.containsKey(object.id);
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assert mObjects.get(object.id) == object;
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object.parent = null;
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if (mFocusedObject == object) {
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sendAccessibilityEvent(mFocusedObject.id, AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED);
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mFocusedObject = null;
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}
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if (mHoveredObject == object) {
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mHoveredObject = null;
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}
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}
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void reset() {
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mObjects.clear();
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if (mFocusedObject != null)
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sendAccessibilityEvent(mFocusedObject.id, AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED);
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mFocusedObject = null;
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mHoveredObject = null;
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sendAccessibilityEvent(0, AccessibilityEvent.TYPE_WINDOW_CONTENT_CHANGED);
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}
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private enum TextDirection {
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UNKNOWN, LTR, RTL;
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public static TextDirection fromInt(int value) {
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switch (value) {
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case 1:
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return RTL;
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case 2:
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return LTR;
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}
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return UNKNOWN;
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}
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}
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private class SemanticsObject {
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SemanticsObject() { }
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int id = -1;
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int flags;
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int actions;
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String label;
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TextDirection textDirection;
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private float left;
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private float top;
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private float right;
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private float bottom;
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private float[] transform;
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SemanticsObject parent;
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List<SemanticsObject> children; // In inverse hit test order (i.e. paint order).
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private boolean inverseTransformDirty = true;
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private float[] inverseTransform;
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private boolean globalGeometryDirty = true;
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private float[] globalTransform;
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private Rect globalRect;
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void log(String indent) {
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Log.i(TAG, indent + "SemanticsObject id=" + id + " label=" + label + " actions=" + actions + " flags=" + flags + "\n" +
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indent + " +-- rect.ltrb=(" + left + ", " + top + ", " + right + ", " + bottom + ")\n" +
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indent + " +-- transform=" + Arrays.toString(transform) + "\n");
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if (children != null) {
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String childIndent = indent + " ";
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for (SemanticsObject child : children) {
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child.log(childIndent);
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}
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}
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}
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void updateWith(ByteBuffer buffer, String[] strings) {
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flags = buffer.getInt();
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actions = buffer.getInt();
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final int stringIndex = buffer.getInt();
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if (stringIndex == -1)
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label = null;
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else
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label = strings[stringIndex];
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textDirection = TextDirection.fromInt(buffer.getInt());
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left = buffer.getFloat();
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top = buffer.getFloat();
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right = buffer.getFloat();
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bottom = buffer.getFloat();
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if (transform == null)
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transform = new float[16];
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for (int i = 0; i < 16; ++i)
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transform[i] = buffer.getFloat();
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inverseTransformDirty = true;
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globalGeometryDirty = true;
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|
|
final int childCount = buffer.getInt();
|
|
if (childCount == 0) {
|
|
children = null;
|
|
} else {
|
|
if (children == null)
|
|
children = new ArrayList<SemanticsObject>(childCount);
|
|
else
|
|
children.clear();
|
|
|
|
for (int i = 0; i < childCount; ++i) {
|
|
SemanticsObject child = getOrCreateObject(buffer.getInt());
|
|
child.parent = this;
|
|
children.add(child);
|
|
}
|
|
}
|
|
}
|
|
|
|
private void ensureInverseTransform() {
|
|
if (!inverseTransformDirty)
|
|
return;
|
|
inverseTransformDirty = false;
|
|
if (inverseTransform == null)
|
|
inverseTransform = new float[16];
|
|
if (!Matrix.invertM(inverseTransform, 0, transform, 0))
|
|
Arrays.fill(inverseTransform, 0);
|
|
}
|
|
|
|
Rect getGlobalRect() {
|
|
assert !globalGeometryDirty;
|
|
return globalRect;
|
|
}
|
|
|
|
SemanticsObject hitTest(float[] point) {
|
|
final float w = point[3];
|
|
final float x = point[0] / w;
|
|
final float y = point[1] / w;
|
|
if (x < left || x >= right || y < top || y >= bottom)
|
|
return null;
|
|
if (children != null) {
|
|
final float[] transformedPoint = new float[4];
|
|
for (int i = children.size() - 1; i >= 0; i -= 1) {
|
|
final SemanticsObject child = children.get(i);
|
|
child.ensureInverseTransform();
|
|
Matrix.multiplyMV(transformedPoint, 0, child.inverseTransform, 0, point, 0);
|
|
final SemanticsObject result = child.hitTest(transformedPoint);
|
|
if (result != null) {
|
|
return result;
|
|
}
|
|
}
|
|
}
|
|
return this;
|
|
}
|
|
|
|
boolean isFocusable() {
|
|
return flags != 0 || (label != null && !label.isEmpty()) || (actions & ~SEMANTICS_ACTION_SCROLLABLE) != 0;
|
|
}
|
|
|
|
void updateRecursively(float[] ancestorTransform, Set<SemanticsObject> visitedObjects, boolean forceUpdate) {
|
|
visitedObjects.add(this);
|
|
|
|
if (globalGeometryDirty)
|
|
forceUpdate = true;
|
|
|
|
if (forceUpdate) {
|
|
if (globalTransform == null)
|
|
globalTransform = new float[16];
|
|
Matrix.multiplyMM(globalTransform, 0, ancestorTransform, 0, transform, 0);
|
|
|
|
final float[] sample = new float[4];
|
|
sample[2] = 0;
|
|
sample[3] = 1;
|
|
|
|
final float[] point1 = new float[4];
|
|
final float[] point2 = new float[4];
|
|
final float[] point3 = new float[4];
|
|
final float[] point4 = new float[4];
|
|
|
|
sample[0] = left;
|
|
sample[1] = top;
|
|
transformPoint(point1, globalTransform, sample);
|
|
|
|
sample[0] = right;
|
|
sample[1] = top;
|
|
transformPoint(point2, globalTransform, sample);
|
|
|
|
sample[0] = right;
|
|
sample[1] = bottom;
|
|
transformPoint(point3, globalTransform, sample);
|
|
|
|
sample[0] = left;
|
|
sample[1] = bottom;
|
|
transformPoint(point4, globalTransform, sample);
|
|
|
|
if (globalRect == null)
|
|
globalRect = new Rect();
|
|
|
|
globalRect.set(
|
|
Math.round(min(point1[0], point2[0], point3[0], point4[0])),
|
|
Math.round(min(point1[1], point2[1], point3[1], point4[1])),
|
|
Math.round(max(point1[0], point2[0], point3[0], point4[0])),
|
|
Math.round(max(point1[1], point2[1], point3[1], point4[1]))
|
|
);
|
|
|
|
globalGeometryDirty = false;
|
|
}
|
|
|
|
assert globalTransform != null;
|
|
assert globalRect != null;
|
|
|
|
if (children != null) {
|
|
for (int i = 0; i < children.size(); ++i) {
|
|
children.get(i).updateRecursively(globalTransform, visitedObjects, forceUpdate);
|
|
}
|
|
}
|
|
}
|
|
|
|
private void transformPoint(float[] result, float[] transform, float[] point) {
|
|
Matrix.multiplyMV(result, 0, transform, 0, point, 0);
|
|
final float w = result[3];
|
|
result[0] /= w;
|
|
result[1] /= w;
|
|
result[2] /= w;
|
|
result[3] = 0;
|
|
}
|
|
|
|
private float min(float a, float b, float c, float d) {
|
|
return Math.min(a, Math.min(b, Math.min(c, d)));
|
|
}
|
|
|
|
private float max(float a, float b, float c, float d) {
|
|
return Math.max(a, Math.max(b, Math.max(c, d)));
|
|
}
|
|
}
|
|
}
|