1. protected
void debugPaintSize(PaintingContext context, Offset offset)

In debug mode, paints a border around this render box.

Called for every RenderBox when debugPaintSizeEnabled is true.

Source

@protected
void debugPaintSize(PaintingContext context, Offset offset) {
  assert(() {
    Paint paint = new Paint()
     ..style = PaintingStyle.stroke
     ..strokeWidth = 1.0
     ..color = debugPaintSizeColor;
    context.canvas.drawRect((offset & size).deflate(0.5), paint);
    return true;
  });
}