misp-bump/app/src/main/java/lu/circl/mispbump/customViews/FixedAspectRatioFrameLayout.java

package lu.circl.mispbump.customViews;


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

import lu.circl.mispbump.R;


public class FixedAspectRatioFrameLayout extends FrameLayout {
    private int mAspectRatioWidth;
    private int mAspectRatioHeight;

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

    public FixedAspectRatioFrameLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
        init(context, attrs);
    }

    public FixedAspectRatioFrameLayout(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        init(context, attrs);
    }

    private void init(Context context, AttributeSet attrs) {
        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.FixedAspectRatioFrameLayout);

        mAspectRatioWidth = a.getInt(R.styleable.FixedAspectRatioFrameLayout_aspectRatioWidth, 1);
        mAspectRatioHeight = a.getInt(R.styleable.FixedAspectRatioFrameLayout_aspectRatioHeight, 1);

        a.recycle();
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        int originalWidth = MeasureSpec.getSize(widthMeasureSpec);

        int originalHeight = MeasureSpec.getSize(heightMeasureSpec);

        int calculatedHeight = originalWidth * mAspectRatioHeight / mAspectRatioWidth;

        int finalWidth, finalHeight;

        if (calculatedHeight > originalHeight) {
            finalWidth = originalHeight * mAspectRatioWidth / mAspectRatioHeight;
            finalHeight = originalHeight;
        } else {
            finalWidth = originalWidth;
            finalHeight = calculatedHeight;
        }

        super.onMeasure(
                MeasureSpec.makeMeasureSpec(finalWidth, MeasureSpec.EXACTLY),
                MeasureSpec.makeMeasureSpec(finalHeight, MeasureSpec.EXACTLY));
    }
}