From 919d8ed3e5ed8ed91382207699db488dadb3f82d Mon Sep 17 00:00:00 2001
From: Jonas Franz <jonas.franz@incloud.de>
Date: Mon, 21 Feb 2022 20:59:32 +0100
Subject: [PATCH] Add user store

---
 lib/app.dart                                  | 29 ++++++++++++-------
 lib/screens/cart/cart_screen.dart             |  2 +-
 .../product_list/product_list_screen.dart     |  2 +-
 lib/store/user_store.dart                     | 11 +++++++
 lib/widgets/user_switch.dart                  | 14 ++++-----
 5 files changed, 37 insertions(+), 21 deletions(-)
 create mode 100644 lib/store/user_store.dart

diff --git a/lib/app.dart b/lib/app.dart
index c755039..a014271 100644
--- a/lib/app.dart
+++ b/lib/app.dart
@@ -1,8 +1,10 @@
 import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
 import 'package:thesis_shop/route_key.dart';
 import 'package:thesis_shop/screens/cart/cart_screen.dart';
 import 'package:thesis_shop/screens/product_list/product_list_screen.dart';
 import 'package:thesis_shop/service/product_service.dart';
+import 'package:thesis_shop/store/user_store.dart';
 import 'package:thesis_shop/utils/map_keys_extension.dart';
 
 class ThesisShopApp extends StatelessWidget {
@@ -12,18 +14,23 @@ class ThesisShopApp extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    return MaterialApp(
-      title: 'Thesis Shop',
-      theme: ThemeData(primarySwatch: Colors.red),
-      darkTheme: ThemeData(
-        primarySwatch: Colors.red,
-        brightness: Brightness.dark,
+    return MultiProvider(
+      providers: [
+        ChangeNotifierProvider(create: (context) => UserStore()),
+      ],
+      child: MaterialApp(
+        title: 'Thesis Shop',
+        theme: ThemeData(primarySwatch: Colors.red),
+        darkTheme: ThemeData(
+          primarySwatch: Colors.red,
+          brightness: Brightness.dark,
+        ),
+        routes: {
+          RouteKey.products: (context) => const ProductListScreen(),
+          RouteKey.cart: (context) => const CartScreen(),
+        }.mapKeys((key) => key.name),
+        initialRoute: 'products',
       ),
-      routes: {
-        RouteKey.products: (context) => const ProductListScreen(),
-        RouteKey.cart: (context) => const CartScreen(),
-      }.mapKeys((key) => key.name),
-      initialRoute: 'products',
     );
   }
 }
diff --git a/lib/screens/cart/cart_screen.dart b/lib/screens/cart/cart_screen.dart
index 08e9e45..e369485 100644
--- a/lib/screens/cart/cart_screen.dart
+++ b/lib/screens/cart/cart_screen.dart
@@ -20,7 +20,7 @@ class CartScreen extends StatelessWidget {
     return Scaffold(
       appBar: AppBar(
         title: const Text('Warenkorb'),
-        actions: [UserSwitch(isOn: true, onChanged: (_) {})],
+        actions: const [UserSwitch()],
       ),
       body: Column(
         mainAxisSize: MainAxisSize.max,
diff --git a/lib/screens/product_list/product_list_screen.dart b/lib/screens/product_list/product_list_screen.dart
index 30ce3a8..e623621 100644
--- a/lib/screens/product_list/product_list_screen.dart
+++ b/lib/screens/product_list/product_list_screen.dart
@@ -21,7 +21,7 @@ class ProductListScreen extends StatelessWidget {
     return Scaffold(
       appBar: AppBar(
         title: const Text('Thesis Shop'),
-        actions: [UserSwitch(isOn: true, onChanged: (_) {})],
+        actions: const [UserSwitch()],
       ),
       body: const CartButtonOverlay(
         child: ProductList(products: products),
diff --git a/lib/store/user_store.dart b/lib/store/user_store.dart
new file mode 100644
index 0000000..85a7957
--- /dev/null
+++ b/lib/store/user_store.dart
@@ -0,0 +1,11 @@
+import 'package:flutter/foundation.dart';
+
+class UserStore extends ChangeNotifier {
+  bool _isSignedIn = false;
+  bool get isSignedIn => _isSignedIn;
+
+  void changeSignIn(bool newValue) {
+    _isSignedIn = newValue;
+    notifyListeners();
+  }
+}
diff --git a/lib/widgets/user_switch.dart b/lib/widgets/user_switch.dart
index 63107e7..a3a13ad 100644
--- a/lib/widgets/user_switch.dart
+++ b/lib/widgets/user_switch.dart
@@ -1,24 +1,22 @@
 import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
 import 'package:thesis_shop/benchmark_counter.dart';
+import 'package:thesis_shop/store/user_store.dart';
 
 class UserSwitch extends StatelessWidget {
-  final bool isOn;
-  final ValueChanged<bool> onChanged;
-  const UserSwitch({
-    required this.isOn,
-    required this.onChanged,
-  }) : super(key: const Key('user_switch'));
+  const UserSwitch() : super(key: const Key('user_switch'));
 
   @override
   Widget build(BuildContext context) {
+    final userStore = context.watch<UserStore>();
     BenchmarkCounters.userSwitch++;
     return Row(
       mainAxisSize: MainAxisSize.min,
       children: [
         const Icon(Icons.account_circle),
         Switch(
-          value: isOn,
-          onChanged: onChanged,
+          value: userStore.isSignedIn,
+          onChanged: userStore.changeSignIn,
           activeColor: Colors.green,
         )
       ],