setupParentData method

  1. @override
void setupParentData (covariant RenderObject child)
override

Alerts the developer that the child's parentData needs to be of type KeepAliveParentDataMixin.

Implementation 

@override
void setupParentData(RenderObject child) {
  if (child.parentData is! SliverGridParentData)
    child.parentData = SliverGridParentData();
}