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