package com.demo.lib.common.widget;

import android.content.Context;
import android.content.res.TypedArray;
import android.util.AttributeSet;
import android.widget.RelativeLayout;

import com.lcjian.lcjianlibrary.R;

public class RatioLayout extends RelativeLayout {

	private float mRatio;

	public RatioLayout(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);

		TypedArray a = getContext().obtainStyledAttributes(attrs,
				R.styleable.RatioLayout, defStyle, 0);
		mRatio = a.getFloat(R.styleable.RatioLayout_ratio, 1);
		a.recycle();
	}

	public RatioLayout(Context context, AttributeSet attrs) {
		this(context, attrs, 0);
	}

	public RatioLayout(Context context) {
		this(context, null);
	}

	@SuppressWarnings("unused")
	@Override
	protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
		// For simple implementation, or internal size is always 0.
		// We depend on the container to specify the layout size of
		// our view. We can't really know what it is since we will be
		// adding and removing different arbitrary views and do not
		// want the layout to change as this happens.
		setMeasuredDimension(getDefaultSize(0, widthMeasureSpec),
				getDefaultSize(0, heightMeasureSpec));

		// Children are just made to fill our space.
		int childWidthSize = getMeasuredWidth();
		int childHeightSize = getMeasuredHeight();
		// if(childWidthSize > childHeightSize) {
		// childWidthSize = childHeightSize;
		// }else {
		// childHeightSize = childWidthSize;
		// }
		widthMeasureSpec = MeasureSpec.makeMeasureSpec(childWidthSize,
				MeasureSpec.EXACTLY);
		heightMeasureSpec = MeasureSpec.makeMeasureSpec(
				(int) (childWidthSize * mRatio), MeasureSpec.EXACTLY);
		super.onMeasure(widthMeasureSpec, heightMeasureSpec);
	}

	public void setRatio(float ratio) {
		mRatio = ratio;
		requestLayout();
	}
}