1 /*
2  * Copyright (C) 2014 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.internal.widget;
18 
19 import android.content.Context;
20 import android.util.AttributeSet;
21 import android.widget.ImageView;
22 
23 /**
24  * Extension of ImageView that correctly applies maxWidth and maxHeight.
25  */
26 public class PreferenceImageView extends ImageView {
27 
PreferenceImageView(Context context)28     public PreferenceImageView(Context context) {
29         this(context, null);
30     }
31 
PreferenceImageView(Context context, AttributeSet attrs)32     public PreferenceImageView(Context context, AttributeSet attrs) {
33         this(context, attrs, 0);
34     }
35 
PreferenceImageView(Context context, AttributeSet attrs, int defStyleAttr)36     public PreferenceImageView(Context context, AttributeSet attrs, int defStyleAttr) {
37         this(context, attrs, defStyleAttr, 0);
38     }
39 
PreferenceImageView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes)40     public PreferenceImageView(Context context, AttributeSet attrs, int defStyleAttr,
41             int defStyleRes) {
42         super(context, attrs, defStyleAttr, defStyleRes);
43     }
44 
45     @Override
onMeasure(int widthMeasureSpec, int heightMeasureSpec)46     protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
47         final int widthMode = MeasureSpec.getMode(widthMeasureSpec);
48         if (widthMode == MeasureSpec.AT_MOST || widthMode == MeasureSpec.UNSPECIFIED) {
49             final int widthSize = MeasureSpec.getSize(widthMeasureSpec);
50             final int maxWidth = getMaxWidth();
51             if (maxWidth != Integer.MAX_VALUE
52                     && (maxWidth < widthSize || widthMode == MeasureSpec.UNSPECIFIED)) {
53                 widthMeasureSpec = MeasureSpec.makeMeasureSpec(maxWidth, MeasureSpec.AT_MOST);
54             }
55         }
56 
57         final int heightMode = MeasureSpec.getMode(heightMeasureSpec);
58         if (heightMode == MeasureSpec.AT_MOST || heightMode == MeasureSpec.UNSPECIFIED) {
59             final int heightSize = MeasureSpec.getSize(heightMeasureSpec);
60             final int maxHeight = getMaxHeight();
61             if (maxHeight != Integer.MAX_VALUE
62                     && (maxHeight < heightSize || heightMode == MeasureSpec.UNSPECIFIED)) {
63                 heightMeasureSpec = MeasureSpec.makeMeasureSpec(maxHeight, MeasureSpec.AT_MOST);
64             }
65         }
66 
67         super.onMeasure(widthMeasureSpec, heightMeasureSpec);
68     }
69 }
70