1 /* 2 * Copyright (C) 2016 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.dialer.app.list; 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 * AccessibilityDelegate that will filter out TYPE_WINDOW_CONTENT_CHANGED Used to suppress "Showing 26 * items x of y" from firing of ListView whenever it's content changes. AccessibilityEvent can only 27 * be rejected at a view's parent once it is generated, use addToParent() to add this delegate to 28 * the parent. 29 */ 30 public class ContentChangedFilter extends AccessibilityDelegate { 31 32 // the view we don't want TYPE_WINDOW_CONTENT_CHANGED to fire. 33 private View view; 34 35 private ContentChangedFilter(View view) { 36 super(); 37 this.view = view; 38 } 39 40 /** Add this delegate to the parent of @param view to filter out TYPE_WINDOW_CONTENT_CHANGED */ 41 public static void addToParent(View view) { 42 View parent = (View) view.getParent(); 43 parent.setAccessibilityDelegate(new ContentChangedFilter(view)); 44 } 45 46 @Override 47 public boolean onRequestSendAccessibilityEvent( 48 ViewGroup host, View child, AccessibilityEvent event) { 49 if (child == view) { 50 if (event.getEventType() == AccessibilityEvent.TYPE_WINDOW_CONTENT_CHANGED) { 51 return false; 52 } 53 } 54 return super.onRequestSendAccessibilityEvent(host, child, event); 55 } 56 } 57
