package com.pan.simplepicture.widget.grid.util;
import android.content.Context;
import android.util.AttributeSet;
import android.widget.ImageView;
/**
* An {@link android.widget.ImageView} layout that maintains a consistent width to height aspect ratio.
*/
public class DynamicHeightImageView extends ImageView {
private double mHeightRatio;
public DynamicHeightImageView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public DynamicHeightImageView(Context context) {
super(context);
}
public void setHeightRatio(double ratio) {
if (ratio != mHeightRatio) {
mHeightRatio = ratio;
requestLayout();
}
}
public double getHeightRatio() {
return mHeightRatio;
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
if (mHeightRatio > 0.0) {
// set the image views size
int width = MeasureSpec.getSize(widthMeasureSpec);
int height = (int) (width * mHeightRatio);
setMeasuredDimension(width, height);
}
else {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
}
}