Flutter Web Navigation - Change container content based on named Route - flutter

Question

I have been searching for tutorial for Flutter Web with Navigation Menu (Side, bottom or top) and named routes. Basically, I want to have the Menu and the MenuContent Container. I created a HomePage Container to display both Menu and MenuContainer.
I want to change the MenuContent content based on the named routes. I used the onGenerateRoute of the Material Page that calls the HomePage. It works, but it refreshes the entire HomePage when I change the route. Is there a way to just change the widget content of my MenuContent rather than loading the entire HomePage. Below is the sample code
main.dart
import 'package:edar_app/cubit/categories/categories_cubit.dart';
import 'package:edar_app/presentation/pages/category/category_bloc_provider.dart';
import 'package:edar_app/presentation/pages/home/home_page.dart';
import 'package:edar_app/presentation/pages/sales/sales_form.dart';
import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({Key? key}) : super(key: key);
// This widget is the root of your application.
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
// This is the theme of your application.
//
// Try running your application with "flutter run". You'll see the
// application has a blue toolbar. Then, without quitting the app, try
// changing the primarySwatch below to Colors.green and then invoke
// "hot reload" (press "r" in the console where you ran "flutter run",
// or simply save your changes to "hot reload" in a Flutter IDE).
// Notice that the counter didn't reset back to zero; the application
// is not restarted.
primarySwatch: Colors.blue,
),
onGenerateRoute: (settings) {
print("on generate route.. ${settings.name}");
if (settings.name == "sales") {
return MaterialPageRoute(
builder: (context) => HomePage(wChild: SalesForm()));
} else if (settings.name == "/categories") {
print('categories is selected');
return MaterialPageRoute(
builder: (context) => HomePage(wChild: CategoryPage());
}
},
onUnknownRoute: (settings) => MaterialPageRoute(
builder: (context) => HomePage(wChild: CategoryPage())),
initialRoute: "/",
home: HomePage(wChild: CategoryPage()),
);
}
}
home_page.dart
import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:side_navigation/side_navigation.dart';
import '../../../cubit/categories/categories_cubit.dart';
import '../../../data/network/network_service.dart';
import '../../../data/repository/category_repository.dart';
import '../sales/sales_form.dart';
class HomePage extends StatefulWidget {
final Widget wChild;
HomePage({required this.wChild});
#override
_HomePageState createState() => _HomePageState();
}
class _HomePageState extends State<HomePage> {
int selectedIndex = 0;
#override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
body: Row(
children: [
SideNavigationBar(
theme: SideNavigationBarTheme(
backgroundColor: Colors.green.shade900,
togglerTheme: SideNavigationBarTogglerTheme.standard(),
itemTheme: const SideNavigationBarItemTheme(
unselectedItemColor: Colors.white,
),
dividerTheme: SideNavigationBarDividerTheme.standard(),
),
selectedIndex: selectedIndex,
items: const [
SideNavigationBarItem(
icon: Icons.dashboard,
label: 'Dashboard',
),
SideNavigationBarItem(
icon: Icons.point_of_sale,
label: 'Sales',
),
SideNavigationBarItem(
icon: Icons.category,
label: 'Category',
),
],
onTap: (index) {
setState(() {
selectedIndex = index;
// navigationChild = widget.wChild;
});
},
toggler: SideBarToggler(
expandIcon: Icons.keyboard_arrow_left,
shrinkIcon: Icons.keyboard_arrow_right,
onToggle: () {
print('Toggle');
}),
),
Expanded(child: widget.wChild)
],
),
),
);
}
}