migrate provider_shopper to go_router (#1540)

provider_shopper/lib/main.dart

@@ -6,6 +6,7 @@ import 'dart:io';
 
 import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
+import 'package:go_router/go_router.dart';
 import 'package:provider/provider.dart';
 import 'package:provider_shopper/common/theme.dart';
 import 'package:provider_shopper/models/cart.dart';
@@ -39,6 +40,28 @@ void setupWindow() {
   }
 }
 
+GoRouter router() {
+  return GoRouter(
+    initialLocation: '/login',
+    routes: [
+      GoRoute(
+        path: '/login',
+        builder: (context, state) => const MyLogin(),
+      ),
+      GoRoute(
+        path: '/catalog',
+        builder: (context, state) => const MyCatalog(),
+        routes: [
+          GoRoute(
+            path: 'cart',
+            builder: (context, state) => const MyCart(),
+          ),
+        ],
+      ),
+    ],
+  );
+}
+
 class MyApp extends StatelessWidget {
   const MyApp({super.key});
 
@@ -62,15 +85,10 @@ class MyApp extends StatelessWidget {
           },
         ),
       ],
-      child: MaterialApp(
+      child: MaterialApp.router(
         title: 'Provider Demo',
         theme: appTheme,
-        initialRoute: '/',
+        routerConfig: router(),
-        routes: {
-          '/': (context) => const MyLogin(),
-          '/catalog': (context) => const MyCatalog(),
-          '/cart': (context) => const MyCart(),
-        },
       ),
     );
   }

provider_shopper/lib/screens/catalog.dart

@@ -3,6 +3,7 @@
 // found in the LICENSE file.
 
 import 'package:flutter/material.dart';
+import 'package:go_router/go_router.dart';
 import 'package:provider/provider.dart';
 import 'package:provider_shopper/models/cart.dart';
 import 'package:provider_shopper/models/catalog.dart';
@@ -80,7 +81,7 @@ class _MyAppBar extends StatelessWidget {
       actions: [
         IconButton(
           icon: const Icon(Icons.shopping_cart),
-          onPressed: () => Navigator.pushNamed(context, '/cart'),
+          onPressed: () => context.go('/catalog/cart'),
         ),
       ],
     );

provider_shopper/lib/screens/login.dart

@@ -3,6 +3,7 @@
 // found in the LICENSE file.
 
 import 'package:flutter/material.dart';
+import 'package:go_router/go_router.dart';
 
 class MyLogin extends StatelessWidget {
   const MyLogin({super.key});
@@ -36,7 +37,7 @@ class MyLogin extends StatelessWidget {
               ),
               ElevatedButton(
                 onPressed: () {
-                  Navigator.pushReplacementNamed(context, '/catalog');
+                  context.pushReplacement('/catalog');
                 },
                 style: ElevatedButton.styleFrom(
                   foregroundColor: Colors.yellow,

provider_shopper/pubspec.yaml

@@ -10,6 +10,7 @@ environment:
 dependencies:
   flutter:
     sdk: flutter
+  go_router: ^6.0.0
   provider: ^6.0.2
   window_size:
     git:

provider_shopper/test/login_widget_test.dart

@@ -5,10 +5,9 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:provider/provider.dart';
+import 'package:provider_shopper/main.dart';
 import 'package:provider_shopper/models/cart.dart';
 import 'package:provider_shopper/models/catalog.dart';
-import 'package:provider_shopper/screens/catalog.dart';
-import 'package:provider_shopper/screens/login.dart';
 
 void main() {
   testWidgets('Login page Widget test', (tester) async {
@@ -23,13 +22,7 @@ void main() {
           },
         ),
       ],
-      child: MaterialApp(
+      child: MaterialApp.router(routerConfig: router()),
-        initialRoute: '/',
-        routes: {
-          '/': (context) => const MyLogin(),
-          '/catalog': (context) => const MyCatalog(),
-        },
-      ),
     ));
 
     // Verifying the behaviour of ENTER button.