1 /*
2  * Copyright (C) 2015 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License
15  */
16 
17 package com.android.contacts.editor;
18 
19 import android.view.View;
20 import android.view.View.AccessibilityDelegate;
21 import android.view.ViewGroup;
22 import android.view.accessibility.AccessibilityEvent;
23 
24 /**
25  * This is an AccessibilityDelegate that filters out the TYPE_VIEW_SELECTED event.
26  */
27 public class ViewSelectedFilter extends AccessibilityDelegate {
28     private View mView; //the view we don't want TYPE_VIEW_SELECTED event to fire.
29 
ViewSelectedFilter(View view)30     private ViewSelectedFilter(View view) {
31         super();
32         mView = view;
33     }
34 
35     /**
36      * AccessibilityEvent can only be suppressed at a view's parent, so this function adds the
37      * delegate to the view's parent.
38      * @param view the view whose TYPE_VIEW_SELECTED event should be suppressed.
39      */
suppressViewSelectedEvent(View view)40     public static void suppressViewSelectedEvent(View view) {
41         final View parent = (View) view.getParent();
42         parent.setAccessibilityDelegate(new ViewSelectedFilter(view));
43     }
44 
45     @Override
onRequestSendAccessibilityEvent( ViewGroup host, View child,AccessibilityEvent event)46     public boolean onRequestSendAccessibilityEvent(
47             ViewGroup host, View child,AccessibilityEvent event) {
48         if (child == mView && event.getEventType() == AccessibilityEvent.TYPE_VIEW_SELECTED) {
49             return false;
50         }
51         return super.onRequestSendAccessibilityEvent(host, child, event);
52     }
53 }
54