package com.wpc.library.widget;

import android.content.Context;
import android.graphics.drawable.Drawable;
import androidx.annotation.Nullable;
import android.util.AttributeSet;
import android.widget.ImageView;

/**
 * Created by weikou2015 on 2018/4/9.
 */

public class ResizableImageView extends ImageView {

    public ResizableImageView(Context context) {
        super(context);
    }

    public ResizableImageView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    public ResizableImageView(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        Drawable d = getDrawable();

        if (d != null) {
            // ceil not round - avoid thin vertical gaps along the left/right edges
            int width = MeasureSpec.getSize(widthMeasureSpec);
            //高度根据使得图片的宽度充满屏幕计算而得
            int height = (int) Math.ceil((float) width * (float) d.getIntrinsicHeight() / (float) d.getIntrinsicWidth());
            setMeasuredDimension(width, height);
        } else {
            super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        }
    }
}