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
17package com.android.documentsui;
18
19import android.content.Context;
20import android.util.AttributeSet;
21import android.widget.ImageView;
22
23/**
24 * Ensures that grid thumbnails are always square.
25 */
26public class GridItemThumbnail extends ImageView {
27    public GridItemThumbnail(Context context) {
28        super(context);
29    }
30
31    public GridItemThumbnail(Context context, AttributeSet attrs) {
32        super(context, attrs);
33    }
34
35    public GridItemThumbnail(Context context, AttributeSet attrs, int defStyle) {
36        super(context, attrs, defStyle);
37    }
38
39    @Override
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