paint method
Default paint implementation.
RenderBox paints no self-content; it forwards painting to its RenderBox children. Subclasses override to draw their own content.
Implementation
@override
void paint(PaintingContext context, Offset offset) {
final child = this.child;
if (child == null) return;
// Include our own position (x, y) consistent with other render objects
context.paintChild(child, offset + Offset(x, y));
}