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 mMajorWeight; 34 private float mMinorWeight; 35 36 public WeightedLinearLayout(Context context) { 37 super(context); 38 } 39 40 public WeightedLinearLayout(Context context, AttributeSet attrs) { 41 super(context, attrs); 42 43 TypedArray a = 44 context.obtainStyledAttributes(attrs, styleable.WeightedLinearLayout); 45 46 mMajorWeight = a.getFloat(styleable.WeightedLinearLayout_majorWeight, 0.0f); 47 mMinorWeight = a.getFloat(styleable.WeightedLinearLayout_minorWeight, 0.0f); 48 49 a.recycle(); 50 } 51 52 @Override 53 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 54 final DisplayMetrics metrics = getContext().getResources().getDisplayMetrics(); 55 final int screenWidth = metrics.widthPixels; 56 final boolean isPortrait = screenWidth < metrics.heightPixels; 57 58 final int widthMode = getMode(widthMeasureSpec); 59 60 super.onMeasure(widthMeasureSpec, heightMeasureSpec); 61 62 int width = getMeasuredWidth(); 63 int height = getMeasuredHeight(); 64 boolean measure = false; 65 66 widthMeasureSpec = MeasureSpec.makeMeasureSpec(width, EXACTLY); 67 heightMeasureSpec = MeasureSpec.makeMeasureSpec(height, EXACTLY); 68 69 final float widthWeight = isPortrait ? mMinorWeight : mMajorWeight; 70 if (widthMode == AT_MOST && widthWeight > 0.0f) { 71 if (width < (screenWidth * widthWeight)) { 72 widthMeasureSpec = MeasureSpec.makeMeasureSpec((int) (screenWidth * widthWeight), 73 EXACTLY); 74 measure = true; 75 } 76 } 77 78 // TODO: Support height? 79 80 if (measure) { 81 super.onMeasure(widthMeasureSpec, heightMeasureSpec); 82 } 83 } 84 } 85
