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.documentsui;
18 
19 import android.content.Context;
20 import android.util.AttributeSet;
21 import android.widget.ImageView;
22 
23 /**
24  * Ensures that grid thumbnails are always square.
25  */
26 public class GridItemThumbnail extends ImageView {
GridItemThumbnail(Context context)27     public GridItemThumbnail(Context context) {
28         super(context);
29     }
30 
GridItemThumbnail(Context context, AttributeSet attrs)31     public GridItemThumbnail(Context context, AttributeSet attrs) {
32         super(context, attrs);
33     }
34 
GridItemThumbnail(Context context, AttributeSet attrs, int defStyle)35     public GridItemThumbnail(Context context, AttributeSet attrs, int defStyle) {
36         super(context, attrs, defStyle);
37     }
38 
39     @Override
onMeasure(int widthMeasureSpec, int heightMeasureSpec)40     public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
41         // Grid layout uses item width to figure out the number of columns, then dynamically fits
42         // rows into the view. The upshot of this is that changing the item width will mess up the
43         // grid layout - so to make the items square, throw out the height and use the width for
44         // both dimensions. The grid layout will correctly adjust the row height.
45         //
46         // Note that this code will need to be changed if the layout manager's orientation is
47         // changed from VERTICAL to HORIZONTAL.
48         super.onMeasure(widthMeasureSpec, widthMeasureSpec);
49     }
50 }
51