content: /*
   * Copyright (C) 2010 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package com.android.internal.widget;
  
  import android.content.Context;
  import android.content.res.TypedArray;
  import android.util.AttributeSet;
  import android.util.DisplayMetrics;
  import android.widget.LinearLayout;
  
  import static android.view.View.MeasureSpec.*;
  import static com.android.internal.R.*;
  
  /**
   * A special layout when measured in AT_MOST will take up a given percentage of
   * the available space.
   */
  public class WeightedLinearLayout extends LinearLayout {
      private float mMajorWeightMin;
      private float mMinorWeightMin;
      private float mMajorWeightMax;
      private float mMinorWeightMax;
  
      public WeightedLinearLayout(Context context) {
          super(context);
      }
  
      public WeightedLinearLayout(Context context, AttributeSet attrs) {
          super(context, attrs);
          
          TypedArray a = 
              context.obtainStyledAttributes(attrs, styleable.WeightedLinearLayout);
  
          mMajorWeightMin = a.getFloat(styleable.WeightedLinearLayout_majorWeightMin, 0.0f);
          mMinorWeightMin = a.getFloat(styleable.WeightedLinearLayout_minorWeightMin, 0.0f);
          mMajorWeightMax = a.getFloat(styleable.WeightedLinearLayout_majorWeightMax, 0.0f);
          mMinorWeightMax = a.getFloat(styleable.WeightedLinearLayout_minorWeightMax, 0.0f);
          
          a.recycle();
      }
  
      @Override
      protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
          final DisplayMetrics metrics = getContext().getResources().getDisplayMetrics();
          final int screenWidth = metrics.widthPixels;
          final boolean isPortrait = screenWidth < metrics.heightPixels;
  
          final int widthMode = getMode(widthMeasureSpec);
  
          super.onMeasure(widthMeasureSpec, heightMeasureSpec);
  
          int width = getMeasuredWidth();
          boolean measure = false;
  
          widthMeasureSpec = MeasureSpec.makeMeasureSpec(width, EXACTLY);
  
          final float widthWeightMin = isPortrait ? mMinorWeightMin : mMajorWeightMin;
          final float widthWeightMax = isPortrait ? mMinorWeightMax : mMajorWeightMax;
          if (widthMode == AT_MOST) {
              final int weightedMin = (int) (screenWidth * widthWeightMin);
              final int weightedMax = (int) (screenWidth * widthWeightMin);
              if (widthWeightMin > 0.0f && width < weightedMin) {
                  widthMeasureSpec = MeasureSpec.makeMeasureSpec(weightedMin, EXACTLY);
                  measure = true;
              } else if (widthWeightMax > 0.0f && width > weightedMax) {
                  widthMeasureSpec = MeasureSpec.makeMeasureSpec(weightedMax, EXACTLY);
                  measure = true;
              }
          }
  
          // TODO: Support height?
  
          if (measure) {
              super.onMeasure(widthMeasureSpec, heightMeasureSpec);
          }
      }
  }
  