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 17 package com.android.email.view; 18 19 import com.android.email.R; 20 21 import android.content.Context; 22 import android.content.res.TypedArray; 23 import android.util.AttributeSet; 24 import android.widget.FrameLayout; 25 26 /** 27 * A {@link FrameLayout} with the max width/height. 28 */ 29 public 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 SizeBoundingFrameLayout(Context context, AttributeSet attrs, int defStyle)35 public SizeBoundingFrameLayout(Context context, AttributeSet attrs, int defStyle) { 36 super(context, attrs, defStyle); 37 initFromAttributeSet(context, attrs); 38 } 39 SizeBoundingFrameLayout(Context context, AttributeSet attrs)40 public SizeBoundingFrameLayout(Context context, AttributeSet attrs) { 41 super(context, attrs); 42 initFromAttributeSet(context, attrs); 43 } 44 SizeBoundingFrameLayout(Context context)45 public SizeBoundingFrameLayout(Context context) { 46 super(context); 47 } 48 initFromAttributeSet(Context c, AttributeSet attrs)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. */ setMaxWidth(int maxWidth)60 public void setMaxWidth(int maxWidth) { 61 mMaxWidth = maxWidth; 62 requestLayout(); 63 invalidate(); 64 } 65 getMaxWidth()66 public int getMaxWidth() { 67 return mMaxWidth; 68 } 69 70 /** Set the max height. Use {@link #DIMENSION_DEFAULT} for unspecified. */ setMaxHeight(int maxHeight)71 public void setMaxHeight(int maxHeight) { 72 mMaxHeight = maxHeight; 73 requestLayout(); 74 invalidate(); 75 } 76 getMaxHeight()77 public int getMaxHeight() { 78 return mMaxHeight; 79 } 80 81 @Override onMeasure(int widthMeasureSpec, int heightMeasureSpec)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