State Restoration support for Veggie Seasons app (#433)

experimental/veggieseasons/lib/screens/home.dart

@@ -0,0 +1,55 @@
+// Copyright 2018 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/cupertino.dart';
+import 'package:flutter/widgets.dart';
+import 'package:veggieseasons/screens/favorites.dart';
+import 'package:veggieseasons/screens/list.dart';
+import 'package:veggieseasons/screens/search.dart';
+import 'package:veggieseasons/screens/settings.dart';
+
+class HomeScreen extends StatelessWidget {
+  HomeScreen({Key key, this.restorationId}) : super(key: key);
+
+  final String restorationId;
+
+  @override
+  Widget build(BuildContext context) {
+    return RestorationScope(
+      restorationId: restorationId,
+      child: CupertinoTabScaffold(
+        restorationId: 'scaffold',
+        tabBar: CupertinoTabBar(items: [
+          BottomNavigationBarItem(
+            icon: Icon(CupertinoIcons.home),
+            label: 'Home',
+          ),
+          BottomNavigationBarItem(
+            icon: Icon(CupertinoIcons.book),
+            label: 'My Garden',
+          ),
+          BottomNavigationBarItem(
+            icon: Icon(CupertinoIcons.search),
+            label: 'Search',
+          ),
+          BottomNavigationBarItem(
+            icon: Icon(CupertinoIcons.settings),
+            label: 'Settings',
+          ),
+        ]),
+        tabBuilder: (context, index) {
+          if (index == 0) {
+            return ListScreen(restorationId: 'list');
+          } else if (index == 1) {
+            return FavoritesScreen(restorationId: 'favorites');
+          } else if (index == 2) {
+            return SearchScreen(restorationId: 'search');
+          } else {
+            return SettingsScreen(restorationId: 'settings');
+          }
+        },
+      ),
+    );
+  }
+}