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.content.res.ColorStateList;
21 import android.content.res.TypedArray;
22 import android.util.AttributeSet;
23 import android.widget.ImageView;
24 
25 /**
26  * Ensures that grid thumbnails are always square.
27  */
28 public class GridItemThumbnail extends ImageView {
GridItemThumbnail(Context context)29     public GridItemThumbnail(Context context) {
30         super(context);
31     }
32 
GridItemThumbnail(Context context, AttributeSet attrs)33     public GridItemThumbnail(Context context, AttributeSet attrs) {
34         super(context, attrs);
35     }
36 
GridItemThumbnail(Context context, AttributeSet attrs, int defStyle)37     public GridItemThumbnail(Context context, AttributeSet attrs, int defStyle) {
38         super(context, attrs, defStyle);
39         TypedArray ta = context.obtainStyledAttributes(R.styleable.GridItem);
40         ColorStateList color = ta.getColorStateList(R.styleable.GridItem_gridItemTint);
41         ta.recycle();
42         setImageTintList(color);
43     }
44 
45     @Override
onMeasure(int widthMeasureSpec, int heightMeasureSpec)46     public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
47         // Grid layout uses item width to figure out the number of columns, then dynamically fits
48         // rows into the view. The upshot of this is that changing the item width will mess up the
49         // grid layout - so to make the items square, throw out the height and use the width for
50         // both dimensions. The grid layout will correctly adjust the row height.
51         //
52         // Note that this code will need to be changed if the layout manager's orientation is
53         // changed from VERTICAL to HORIZONTAL.
54         super.onMeasure(widthMeasureSpec, widthMeasureSpec);
55     }
56 }
57