Thinking & coding: linking the NavRail to the screens.

In this session I have created all the main screens of my app that I will need. In my case, those are 5 main screens that can be reached from the navigation page. I have created these screens because I need them to test the navigation rail routing. For now I just colored all screens. Offcourse I had to imort all the screens, to be able to call them.


In the Classe HomeScreenState I have made a list of the different main screens. This list is then linked to the selected index of the Navigation Rail. And so I can call up and display the screens to the right of the Rail. This was compleet new to me.


I would love to hear in the comments whether this is the correct way of routing or whether it can be done in a better way.


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class HomeScreen extends StatefulWidget {
  HomeScreen({Key key}) : super(key: key);

  @override
  _HomeScreenState createState() => _HomeScreenState();
}

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

  var list = [
    NavigationScreen(),
    EventScreen(),
    ParkScreen(),
    FoodScreen(),
    SosScreen()
  ];

Wow, this was actually a nice new milestone in my app for me.

In the next session I will build the NavigationScreen. I'm going to do this in the standard theme colors. Then I want to adapt the project theme to the prototype design. For that I will have to study how to best build my own theme. The problem is that I have already found so many different ways on the internet and youtube that I don't know which is the best or the most perfomant. After all, this is a project that is going into production and not a test.


Do, believe and be happy,


Stefaan




Code

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import 'package:flutter/material.dart';
import 'package:my_first_production/screens/events_screen.dart';
import 'package:my_first_production/screens/food_screen.dart';
import 'package:my_first_production/screens/navigation_screen.dart';
import 'package:my_first_production/screens/park_screen.dart';
import 'package:my_first_production/screens/sos_screen.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  // This widget is the root of my application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: HomeScreen(), //is the landingspage where all navigation happens. Inside this screen is the Naviagtion screen.
    );
  }
}
// this screen holds the ROW with left the NavRail end right the screens

class HomeScreen extends StatefulWidget {
  HomeScreen({Key key}) : super(key: key);

  @override
  _HomeScreenState createState() => _HomeScreenState();
}

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

  var list = [
    NavigationScreen(),
    EventScreen(),
    ParkScreen(),
    FoodScreen(),
    SosScreen()
  ];

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Row(
        children: [
          NavigationRail(
            onDestinationSelected: (newIndex) {
              setState(() {
                selectedIndex = newIndex;
              });
            },
            elevation: 3,
            backgroundColor: Colors.green[100],
            groupAlignment: 0,
            selectedIndex: selectedIndex,
            destinations: [
              NavigationRailDestination(
                icon: Icon(Icons.home_outlined),
                label: Text('Home'),
              ),
              NavigationRailDestination(
                icon: Icon(Icons.event_available),
                label: Text('Events'),
              ),
              NavigationRailDestination(
                icon: Icon(Icons.local_parking_outlined),
                label: Text('Parking'),
              ),
              NavigationRailDestination(
                icon: Icon(Icons.fastfood_outlined),
                label: Text('Food'),
              ),
              NavigationRailDestination(
                icon: Icon(Icons.medical_services_outlined),
                label: Text('S.O.S.'),
              ),
            ],
          ),
          Expanded(
            child: Stack(
              children: <Widget>[list[selectedIndex],],
            ),
          )
        ],
      ),
    );
  }
}



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import 'package:flutter/material.dart';

class NavigationScreen extends StatelessWidget {
  const NavigationScreen({Key key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Container(
      decoration: BoxDecoration(
        color: Colors.white,
        image: DecorationImage(
            image: AssetImage('assets/images/Background.png'),
            fit: BoxFit.cover),
      ),
      child: Scaffold(
        backgroundColor: Colors.transparent,
        body: Column(
          children:[
            SizedBox(height:100),
            Padding(
              padding: const EdgeInsets.fromLTRB(20, 0, 0, 0),
              child: Text('Home Screen'),
            ),
          ]
        ),
      ),
    );
  }
}
Location: Antwerp, Belgium

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