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/*
* Copyright (C) 2017 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 android.view.accessibility;
import static com.android.internal.util.ObjectUtils.firstNotNull;
import android.annotation.NonNull;
import android.annotation.Nullable;
import android.view.View;
import android.view.ViewParent;
import java.util.HashSet;
/**
* @hide
*/
public class SendWindowContentChangedAccessibilityEvent
extends ThrottlingAccessibilityEventSender {
private int mChangeTypes = 0;
private HashSet<View> mTempHashSet;
@Override
protected void performSendEvent(@NonNull View source) {
AccessibilityEvent event = AccessibilityEvent.obtain();
event.setEventType(AccessibilityEvent.TYPE_WINDOW_CONTENT_CHANGED);
event.setContentChangeTypes(mChangeTypes);
source.sendAccessibilityEventUnchecked(event);
}
@Override
protected void resetState(@Nullable View source) {
if (source != null) {
source.resetSubtreeAccessibilityStateChanged();
}
mChangeTypes = 0;
}
/**
* Post the {@link AccessibilityEvent#TYPE_WINDOW_CONTENT_CHANGED} event with the given
* {@link AccessibilityEvent#getContentChangeTypes change type} for the given view
*/
public void runOrPost(View source, int changeType) {
if (source.getAccessibilityLiveRegion() != View.ACCESSIBILITY_LIVE_REGION_NONE) {
sendNowIfPending();
mChangeTypes = changeType;
sendNow(source);
} else {
mChangeTypes |= changeType;
scheduleFor(source);
}
}
@Override
protected @Nullable View tryMerge(@NonNull View oldSource, @NonNull View newSource) {
// If there is no common predecessor, then oldSource points to
// a removed view, hence in this case always prefer the newSource.
return firstNotNull(
getCommonPredecessor(oldSource, newSource),
newSource);
}
private View getCommonPredecessor(View first, View second) {
if (mTempHashSet == null) {
mTempHashSet = new HashSet<>();
}
HashSet<View> seen = mTempHashSet;
seen.clear();
View firstCurrent = first;
while (firstCurrent != null) {
seen.add(firstCurrent);
ViewParent firstCurrentParent = firstCurrent.getParent();
if (firstCurrentParent instanceof View) {
firstCurrent = (View) firstCurrentParent;
} else {
firstCurrent = null;
}
}
View secondCurrent = second;
while (secondCurrent != null) {
if (seen.contains(secondCurrent)) {
seen.clear();
return secondCurrent;
}
ViewParent secondCurrentParent = secondCurrent.getParent();
if (secondCurrentParent instanceof View) {
secondCurrent = (View) secondCurrentParent;
} else {
secondCurrent = null;
}
}
seen.clear();
return null;
}
}
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