1 /* 2 * Copyright (C) 2010 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.content.res.TypedArray; 21 import android.util.AttributeSet; 22 import android.util.DisplayMetrics; 23 import android.widget.LinearLayout; 24 25 import static android.view.View.MeasureSpec.*; 26 import static com.android.internal.R.*; 27 28 /** 29 * A special layout when measured in AT_MOST will take up a given percentage of 30 * the available space. 31 */ 32 public class WeightedLinearLayout extends LinearLayout { 33 private float mMajorWeightMin; 34 private float mMinorWeightMin; 35 private float mMajorWeightMax; 36 private float mMinorWeightMax; 37 38 public WeightedLinearLayout(Context context) { 39 super(context); 40 } 41 42 public WeightedLinearLayout(Context context, AttributeSet attrs) { 43 super(context, attrs); 44 45 TypedArray a = 46 context.obtainStyledAttributes(attrs, styleable.WeightedLinearLayout); 47 48 mMajorWeightMin = a.getFloat(styleable.WeightedLinearLayout_majorWeightMin, 0.0f); 49 mMinorWeightMin = a.getFloat(styleable.WeightedLinearLayout_minorWeightMin, 0.0f); 50 mMajorWeightMax = a.getFloat(styleable.WeightedLinearLayout_majorWeightMax, 0.0f); 51 mMinorWeightMax = a.getFloat(styleable.WeightedLinearLayout_minorWeightMax, 0.0f); 52 53 a.recycle(); 54 } 55 56 @Override 57 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 58 final DisplayMetrics metrics = getContext().getResources().getDisplayMetrics(); 59 final int screenWidth = metrics.widthPixels; 60 final boolean isPortrait = screenWidth < metrics.heightPixels; 61 62 final int widthMode = getMode(widthMeasureSpec); 63 64 super.onMeasure(widthMeasureSpec, heightMeasureSpec); 65 66 int width = getMeasuredWidth(); 67 boolean measure = false; 68 69 widthMeasureSpec = MeasureSpec.makeMeasureSpec(width, EXACTLY); 70 71 final float widthWeightMin = isPortrait ? mMinorWeightMin : mMajorWeightMin; 72 final float widthWeightMax = isPortrait ? mMinorWeightMax : mMajorWeightMax; 73 if (widthMode == AT_MOST) { 74 final int weightedMin = (int) (screenWidth * widthWeightMin); 75 final int weightedMax = (int) (screenWidth * widthWeightMin); 76 if (widthWeightMin > 0.0f && width < weightedMin) { 77 widthMeasureSpec = MeasureSpec.makeMeasureSpec(weightedMin, EXACTLY); 78 measure = true; 79 } else if (widthWeightMax > 0.0f && width > weightedMax) { 80 widthMeasureSpec = MeasureSpec.makeMeasureSpec(weightedMax, EXACTLY); 81 measure = true; 82 } 83 } 84 85 // TODO: Support height? 86 87 if (measure) { 88 super.onMeasure(widthMeasureSpec, heightMeasureSpec); 89 } 90 } 91 } 92