SizeBoundingFrameLayout.java revision de9e706ed900b2108165f512384e69871e069fa1 
1/*
2 * Copyright (C) 2011 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.email.view;
18
19import com.android.email.R;
20
21import android.content.Context;
22import android.content.res.TypedArray;
23import android.util.AttributeSet;
24import android.widget.FrameLayout;
25
26/**
27 * A {@link FrameLayout} with the max width/height.
28 */
29public class SizeBoundingFrameLayout extends FrameLayout {
30    public static final int DIMENSION_DEFAULT = -1; // unspecified
31
32    private int mMaxWidth = DIMENSION_DEFAULT;
33    private int mMaxHeight = DIMENSION_DEFAULT;
34
35    public SizeBoundingFrameLayout(Context context, AttributeSet attrs, int defStyle) {
36        super(context, attrs, defStyle);
37        initFromAttributeSet(context, attrs);
38    }
39
40    public SizeBoundingFrameLayout(Context context, AttributeSet attrs) {
41        super(context, attrs);
42        initFromAttributeSet(context, attrs);
43    }
44
45    public SizeBoundingFrameLayout(Context context) {
46        super(context);
47    }
48
49    private void initFromAttributeSet(Context c, AttributeSet attrs) {
50        TypedArray a = c.obtainStyledAttributes(attrs,
51                R.styleable.SizeBoundingFrameLayout_attributes);
52        mMaxWidth = a.getDimensionPixelSize(
53                R.styleable.SizeBoundingFrameLayout_attributes_maxWidth, DIMENSION_DEFAULT);
54        mMaxHeight = a.getDimensionPixelSize(
55                R.styleable.SizeBoundingFrameLayout_attributes_maxHeight, DIMENSION_DEFAULT);
56        a.recycle();
57    }
58
59    /** Set the max width.  Use {@link #DIMENSION_DEFAULT} for unspecified. */
60    public void setMaxWidth(int maxWidth) {
61        mMaxWidth = maxWidth;
62        requestLayout();
63        invalidate();
64    }
65
66    public int getMaxWidth() {
67        return mMaxWidth;
68    }
69
70    /** Set the max height.  Use {@link #DIMENSION_DEFAULT} for unspecified. */
71    public void setMaxHeight(int maxHeight) {
72        mMaxHeight = maxHeight;
73        requestLayout();
74        invalidate();
75    }
76
77    public int getMaxHeight() {
78        return mMaxHeight;
79    }
80
81    @Override
82    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
83        int widthMode = MeasureSpec.getMode(widthMeasureSpec);
84        int heightMode = MeasureSpec.getMode(heightMeasureSpec);
85        int widthSize = MeasureSpec.getSize(widthMeasureSpec);
86        int heightSize = MeasureSpec.getSize(heightMeasureSpec);
87
88        // Limit the size, unless MeasureSpec.EXACTLY
89        if (mMaxWidth >= 0) {
90            switch (widthMode) {
91                case MeasureSpec.AT_MOST:
92                    widthSize = Math.min(widthSize, mMaxWidth);
93                    break;
94                case MeasureSpec.UNSPECIFIED:
95                    widthMode = MeasureSpec.AT_MOST;
96                    widthSize = mMaxWidth;
97                    break;
98            }
99        }
100
101        if (mMaxHeight >= 0) {
102            switch (heightMode) {
103                case MeasureSpec.AT_MOST:
104                    heightSize = Math.min(heightSize, mMaxHeight);
105                    break;
106                case MeasureSpec.UNSPECIFIED:
107                    heightMode = MeasureSpec.AT_MOST;
108                    heightSize = mMaxHeight;
109                    break;
110            }
111        }
112        super.onMeasure(MeasureSpec.makeMeasureSpec(widthSize, widthMode),
113                MeasureSpec.makeMeasureSpec(heightSize, heightMode));
114    }
115}
116