PreferenceImageView.java revision ecd7c96aa4144224c1e6c47d079d043abb86839c 
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
17package com.android.internal.widget;
18
19import android.content.Context;
20import android.util.AttributeSet;
21import android.widget.ImageView;
22
23/**
24 * Extension of ImageView that correctly applies maxWidth and maxHeight.
25 */
26public class PreferenceImageView extends ImageView {
27
28    public PreferenceImageView(Context context) {
29        this(context, null);
30    }
31
32    public PreferenceImageView(Context context, AttributeSet attrs) {
33        this(context, attrs, 0);
34    }
35
36    public PreferenceImageView(Context context, AttributeSet attrs, int defStyleAttr) {
37        this(context, attrs, defStyleAttr, 0);
38    }
39
40    public PreferenceImageView(Context context, AttributeSet attrs, int defStyleAttr,
41            int defStyleRes) {
42        super(context, attrs, defStyleAttr, defStyleRes);
43    }
44
45    @Override
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