1 /*
2  * Copyright 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 package com.android.settings.dashboard.conditional;
17 
18 import android.content.Context;
19 import android.support.annotation.Nullable;
20 import android.support.v7.widget.RecyclerView;
21 import android.util.AttributeSet;
22 
23 /**
24  * Version of RecyclerView that can have listeners for onWindowFocusChanged.
25  */
26 public class FocusRecyclerView extends RecyclerView {
27 
28     private FocusListener mListener;
29 
FocusRecyclerView(Context context, @Nullable AttributeSet attrs)30     public FocusRecyclerView(Context context, @Nullable AttributeSet attrs) {
31         super(context, attrs);
32     }
33 
34     @Override
onWindowFocusChanged(boolean hasWindowFocus)35     public void onWindowFocusChanged(boolean hasWindowFocus) {
36         super.onWindowFocusChanged(hasWindowFocus);
37         if (mListener != null) {
38             mListener.onWindowFocusChanged(hasWindowFocus);
39         }
40     }
41 
setListener(FocusListener listener)42     public void setListener(FocusListener listener) {
43         mListener = listener;
44     }
45 
46     public interface FocusListener {
onWindowFocusChanged(boolean hasWindowFocus)47         void onWindowFocusChanged(boolean hasWindowFocus);
48     }
49 }
50