Chiao Cheng | 7677fb6 | 2012-12-06 13:44:07 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2012 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 | |
Gary Mai | 69c182a | 2016-12-05 13:07:03 -0800 | [diff] [blame] | 17 | package com.android.contacts.widget; |
Chiao Cheng | 7677fb6 | 2012-12-06 13:44:07 -0800 | [diff] [blame] | 18 | |
| 19 | import android.content.Context; |
| 20 | import android.content.res.TypedArray; |
| 21 | import android.util.AttributeSet; |
| 22 | import android.view.View; |
| 23 | import android.view.ViewGroup; |
| 24 | |
Arthur Wang | 3f6a244 | 2016-12-05 14:51:59 -0800 | [diff] [blame] | 25 | import com.android.contacts.R; |
Chiao Cheng | 7677fb6 | 2012-12-06 13:44:07 -0800 | [diff] [blame] | 26 | |
| 27 | /** |
| 28 | * Layout that calculates its height based on its width, or vice versa (depending on the set |
| 29 | * {@link #setDirection(Direction)}. The factor is specified in {@link #setRatio(float)}. |
| 30 | * <p>For {@link Direction#heightToWidth}: width := height * factor</p> |
| 31 | * <p>For {@link Direction#widthToHeight}: height := width * factor</p> |
| 32 | * <p>Only one child is allowed; if more are required, another ViewGroup can be used as the direct |
| 33 | * child of this layout.</p> |
| 34 | */ |
| 35 | public class ProportionalLayout extends ViewGroup { |
| 36 | /** Specifies whether the width should be calculated based on the height or vice-versa */ |
| 37 | public enum Direction { |
| 38 | widthToHeight("widthToHeight"), |
| 39 | heightToWidth("heightToWidth"); |
| 40 | |
| 41 | public final String XmlName; |
| 42 | |
| 43 | private Direction(String xmlName) { |
| 44 | XmlName = xmlName; |
| 45 | } |
| 46 | |
| 47 | /** |
| 48 | * Parses the given direction string and returns the Direction instance. This |
| 49 | * should be used when inflating from xml |
| 50 | */ |
| 51 | public static Direction parse(String value) { |
| 52 | if (widthToHeight.XmlName.equals(value)) { |
| 53 | return Direction.widthToHeight; |
| 54 | } else if (heightToWidth.XmlName.equals(value)) { |
| 55 | return Direction.heightToWidth; |
| 56 | } else { |
| 57 | throw new IllegalStateException("direction must be either " + |
| 58 | widthToHeight.XmlName + " or " + heightToWidth.XmlName); |
| 59 | } |
| 60 | } |
| 61 | } |
| 62 | |
| 63 | private Direction mDirection; |
| 64 | private float mRatio; |
| 65 | |
| 66 | public ProportionalLayout(Context context) { |
| 67 | super(context); |
| 68 | } |
| 69 | |
| 70 | public ProportionalLayout(Context context, AttributeSet attrs) { |
| 71 | super(context, attrs); |
| 72 | initFromAttributes(context, attrs); |
| 73 | } |
| 74 | |
| 75 | public ProportionalLayout(Context context, AttributeSet attrs, int defStyle) { |
| 76 | super(context, attrs, defStyle); |
| 77 | initFromAttributes(context, attrs); |
| 78 | } |
| 79 | |
| 80 | private void initFromAttributes(Context context, AttributeSet attrs) { |
| 81 | TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.ProportionalLayout); |
| 82 | |
| 83 | mDirection = Direction.parse(a.getString(R.styleable.ProportionalLayout_direction)); |
| 84 | mRatio = a.getFloat(R.styleable.ProportionalLayout_ratio, 1.0f); |
| 85 | |
| 86 | a.recycle(); |
| 87 | } |
| 88 | |
| 89 | @Override |
| 90 | protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { |
| 91 | if (getChildCount() != 1) { |
| 92 | throw new IllegalStateException("ProportionalLayout requires exactly one child"); |
| 93 | } |
| 94 | |
| 95 | final View child = getChildAt(0); |
| 96 | |
| 97 | // Do a first pass to get the optimal size |
| 98 | measureChild(child, widthMeasureSpec, heightMeasureSpec); |
| 99 | final int childWidth = child.getMeasuredWidth(); |
| 100 | final int childHeight = child.getMeasuredHeight(); |
| 101 | |
| 102 | final int width; |
| 103 | final int height; |
| 104 | if (mDirection == Direction.heightToWidth) { |
| 105 | width = Math.round(childHeight * mRatio); |
| 106 | height = childHeight; |
| 107 | } else { |
| 108 | width = childWidth; |
| 109 | height = Math.round(childWidth * mRatio); |
| 110 | } |
| 111 | |
| 112 | // Do a second pass so that all children are informed of the new size |
| 113 | measureChild(child, |
| 114 | MeasureSpec.makeMeasureSpec(width, MeasureSpec.EXACTLY), |
| 115 | MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY)); |
| 116 | |
| 117 | setMeasuredDimension( |
| 118 | resolveSize(width, widthMeasureSpec), resolveSize(height, heightMeasureSpec)); |
| 119 | } |
| 120 | |
| 121 | @Override |
| 122 | protected void onLayout(boolean changed, int left, int top, int right, int bottom) { |
| 123 | if (getChildCount() != 1) { |
| 124 | throw new IllegalStateException("ProportionalLayout requires exactly one child"); |
| 125 | } |
| 126 | |
| 127 | final View child = getChildAt(0); |
| 128 | child.layout(0, 0, right-left, bottom-top); |
| 129 | } |
| 130 | |
| 131 | public Direction getDirection() { |
| 132 | return mDirection; |
| 133 | } |
| 134 | |
| 135 | public void setDirection(Direction direction) { |
| 136 | mDirection = direction; |
| 137 | } |
| 138 | |
| 139 | public float getRatio() { |
| 140 | return mRatio; |
| 141 | } |
| 142 | |
| 143 | public void setRatio(float ratio) { |
| 144 | mRatio = ratio; |
| 145 | } |
| 146 | } |