getRenderBox method
Implementation
RenderBox? getRenderBox() {
  final obj = _state?.context.findRenderObject();
  if (obj != null) {
    return obj as RenderBox;
  }
  return null;
}RenderBox? getRenderBox() {
  final obj = _state?.context.findRenderObject();
  if (obj != null) {
    return obj as RenderBox;
  }
  return null;
}