root_page.dart

import 'package:flutter/material.dart';

import '../home/home_page.dart';
import 'widgets/bottom_navigator.dart';

class RootPage extends StatefulWidget {
  const RootPage({Key? key}) : super(key: key);

  @override
  State<RootPage> createState() => _RootPageState();
}

class _RootPageState extends State<RootPage> {
  late final GlobalKey<NavigatorState> _pageNavigatorKey;
  late final List<String> _pages;
  late int _currentIndex;

  @override
  void initState() {
    _pageNavigatorKey = GlobalKey();
    _pages = [
      HomePage.router,
      '',
      '',
      '',
    ];
    _currentIndex = 0;
    super.initState();
  }

  @override
  void dispose() {
    _pageNavigatorKey.currentState?.dispose();
    _pages.clear();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Navigator(
        initialRoute: HomePage.router,
        key: _pageNavigatorKey,
        onGenerateRoute: (settings) {
          int pageIndex = _pages.indexOf(settings.name ?? '');
          if (pageIndex > -1 && pageIndex != _currentIndex) {
            setState(() {
              _currentIndex = pageIndex;
            });
          }
          
          late Widget _currentPage;

          switch (settings.name) {
            case HomePage.router:
              _currentPage = const HomePage();
              break;
            default:
              _currentPage = Container();
          }

          return MaterialPageRoute(builder: (context) => _currentPage);
        },
      ),
      bottomNavigationBar: BottomNavigator(
        currentIndex: _currentIndex,
        onItemPressed: (index) {
          setState(() {
            _currentIndex = index;
            _pageNavigatorKey.currentState?.pushNamed(_pages[index]);
          });
        },
      ),
    );
  }
}