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/*
* Copyright (C) 2016 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.dialer.app.list;
import android.view.View;
import android.view.View.AccessibilityDelegate;
import android.view.ViewGroup;
import android.view.accessibility.AccessibilityEvent;
/**
* AccessibilityDelegate that will filter out TYPE_WINDOW_CONTENT_CHANGED Used to suppress "Showing
* items x of y" from firing of ListView whenever it's content changes. AccessibilityEvent can only
* be rejected at a view's parent once it is generated, use addToParent() to add this delegate to
* the parent.
*/
public class ContentChangedFilter extends AccessibilityDelegate {
// the view we don't want TYPE_WINDOW_CONTENT_CHANGED to fire.
private View view;
private ContentChangedFilter(View view) {
super();
this.view = view;
}
/** Add this delegate to the parent of @param view to filter out TYPE_WINDOW_CONTENT_CHANGED */
public static void addToParent(View view) {
View parent = (View) view.getParent();
parent.setAccessibilityDelegate(new ContentChangedFilter(view));
}
@Override
public boolean onRequestSendAccessibilityEvent(
ViewGroup host, View child, AccessibilityEvent event) {
if (child == view) {
if (event.getEventType() == AccessibilityEvent.TYPE_WINDOW_CONTENT_CHANGED) {
return false;
}
}
return super.onRequestSendAccessibilityEvent(host, child, event);
}
}
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