buildWithChild method
A build method that receives an extra child parameter.
This method may be called with a child different from the parameter
passed to the constructor of SingleChildStatelessModifier.
It may also be called again with a different child, without this widget
being recreated.
Implementation
@override
Widget buildWithChild(BuildContext context, Widget? child) {
if (controller == null) {
return PrimaryScrollController.none(child: child!);
}
return PrimaryScrollController(
controller: controller!,
child: child!,
);
}