package ch.threema.app.ui;

import android.content.Context;
import android.graphics.Canvas;
import android.util.AttributeSet;
import android.view.Gravity;

import androidx.appcompat.widget.AppCompatTextView;

public class VerticalTextView extends AppCompatTextView {
    final boolean topDown;

    public VerticalTextView(Context context,
                            AttributeSet attrs) {
        super(context, attrs);
        final int gravity = getGravity();
        if (Gravity.isVertical(gravity) && (gravity & Gravity.VERTICAL_GRAVITY_MASK) == Gravity.BOTTOM) {
            setGravity((gravity & Gravity.HORIZONTAL_GRAVITY_MASK) | Gravity.TOP);
            topDown = false;
        } else {
            topDown = true;
        }
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(heightMeasureSpec, widthMeasureSpec);
        setMeasuredDimension(getMeasuredHeight(), getMeasuredWidth());
    }

    @Override
    protected void onDraw(Canvas canvas) {
        if (topDown) {
            canvas.translate(getWidth(), 0);
            canvas.rotate(90);
        } else {
            canvas.translate(0, getHeight());
            canvas.rotate(-90);
        }

        canvas.translate(getCompoundPaddingLeft(), getExtendedPaddingTop());
        getLayout().draw(canvas);
    }
}

