Split into multiple files

lib/main.dart

@@ -1,6 +1,8 @@
-import 'package:english_words/english_words.dart';
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
+import 'states/my_app_states.dart';
+import 'widgets/big_card.dart';
+import 'widgets/my_home_page.dart';
 
 void main() {
   runApp(MyApp());
@@ -25,90 +27,6 @@ class MyApp extends StatelessWidget {
   }
 }
 
-class MyAppState extends ChangeNotifier {
-  var current = WordPair.random();
-  var favourites = <WordPair>[];
-
-  void getNext() {
-    current = WordPair.random();
-    notifyListeners();
-  }
-
-  void toggleFavourites() {
-    if (favourites.contains(current)) {
-      favourites.remove(current);
-    } else {
-      favourites.add(current);
-    }
-    notifyListeners();
-  }
-}
-
-class BigCard extends StatelessWidget {
-  const BigCard({
-    super.key,
-    required this.pair,
-  });
-
-  final WordPair pair;
-
-  @override
-  Widget build(BuildContext context) {
-    final theme = Theme.of(context);
-    final style = theme.textTheme.displayMedium!.copyWith(
-      color: theme.colorScheme.onPrimary,
-    );
-
-    return Card(
-      color: theme.colorScheme.primary,
-      child: Padding(
-        padding: const EdgeInsets.all(20.0),
-        child: Text(pair.asLowerCase,
-            semanticsLabel: "${pair.first} ${pair.second}", style: style),
-      ),
-    );
-  }
-}
-
-// ...
-
-class MyHomePage extends StatelessWidget {
-  @override
-  Widget build(BuildContext context) {
-    return Scaffold(
-      body: Row(
-        children: [
-          SafeArea(
-            child: NavigationRail(
-              extended: true,
-              destinations: [
-                NavigationRailDestination(
-                  icon: Icon(Icons.home),
-                  label: Text('Home'),
-                ),
-                NavigationRailDestination(
-                  icon: Icon(Icons.favorite),
-                  label: Text('Favorites'),
-                ),
-              ],
-              selectedIndex: 0,
-              onDestinationSelected: (value) {
-                print('selected: $value');
-              },
-            ),
-          ),
-          Expanded(
-            child: Container(
-              color: Theme.of(context).colorScheme.primaryContainer,
-              child: GeneratorPage(),
-            ),
-          ),
-        ],
-      ),
-    );
-  }
-}
-
 class GeneratorPage extends StatelessWidget {
   @override
   Widget build(BuildContext context) {