Navigation Bar Flutter

I'm trying to have a navigation bar that can navigate into 3 pages (Home, Profile, and Favorites). I follow a course online, somehow it didn't list the file that normally other people do to navigate (example: List _pages = [Home(),Profile()]).

I try to create the list with all the context inside however I got an error on the 'widget' saying that it can't be access in a initalizer.

Since the code is connected to the Firebase, removing 'user widget.user' will lose all the data of the current user such as the their favorites food.

Is there a way to change the body in the Home.dart so that it can navigate to multiple pages since the code below is only ideal for 2 pages (ItemList & ProfileScreen) to navigates.

Home.Dart

 class HomeScreen extends StatefulWidget {
  final Function logOut;
  final User user;
  HomeScreen({@required this.logOut, @required this.user});
  @override
  _HomeScreenState createState() => _HomeScreenState();
}

class _HomeScreenState extends State<HomeScreen> {
  int currentItem = 0;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(
          'Order Je!',
          style: TextStyle(fontSize: 26, fontWeight: FontWeight.bold),
        ),
        centerTitle: true,
        backgroundColor: MainColors.whiteColor,
        elevation: 0,
      ),
      body: currentItem == 1
          ? ProfileScreen(
              logout: () {
                widget.logOut();
              },
            )
          : ItemList(user: widget.user),
      bottomNavigationBar: CustomNavBar(
        currentSelectedItem: (value) {
          setState(() {
            currentItem = value;
          });
        },
      ),
    );
  }
}

class CustomNavBar extends StatefulWidget {
  final Function(int) currentSelectedItem;
  CustomNavBar({@required this.currentSelectedItem});
  @override
  _CustomNavBarState createState() => _CustomNavBarState();
}

class _CustomNavBarState extends State<CustomNavBar> {
  int selectedItem = 0;

  @override
  Widget build(BuildContext context) {
    return CurvedNavigationBar(
      color: Colors.white,
      height: 52,
      backgroundColor: MainColors.primaryColor,
      animationCurve: Curves.easeInOut,
      animationDuration: Duration(milliseconds: 350),
      index: selectedItem,
      onTap: (currItem) {
        setState(() {
          selectedItem = currItem;
          widget.currentSelectedItem(currItem);
        });
      },
      items: <Widget>[
        Icon(Icons.home),
        Icon(Icons.account_circle),
        Icon(Icons.favorite)
      ],
    );
  }
}

Sorry for asking such stupid question. I'm new in Flutter and Firebase development. Thank You.