Flutter update refresh previous page when page has been pushed via a stateless widget

So here is the problem. TabScreen() with 3 pages and one fabcontainer button (Stateless widget). When pressed the fabcontainer will give you the chances of make one upload, after the upload i would like to refresh one of the page of the tabscreen.

    return Container(
      height: 45.0,
      width: 45.0,
      // ignore: missing_required_param
      child: FabContainer(
        icon: Ionicons.add_outline,
        mini: true,
      ),
    );
  }

OnTap of the fabcontainer:

                  Navigator.pop(context);
                  Navigator.of(context).push(
                    CupertinoPageRoute(
                      builder: (_) => CreatePost(),
                    ),
                  );
                },

Cannot add a .then(){setState... } because it is a stateless widget and i need to set the state of a precise page, not of the fabcontainer.

Any idea?

Thanks!

Define a updateUi method inside your TabScreen (which defines the pages)

TabScreen:

void updateUi(){
 // here your logic to change the ui
 // call setState after you made your changes
 setState(() => {});
}

Pass this function as a constructor param to your FabContainer button

FabContainer(
        icon: Ionicons.add_outline,
        mini: true,
        callback: updateUi,

      ),

Define it in your FabContainer class

final Function() callback;

Call it to update the ui

callback.call();