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/*
* 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);
}
}
}
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