after bloc

.vscode/launch.json

@@ -0,0 +1,13 @@
+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "cloudtech_calculator",
+            "request": "launch",
+            "type": "dart"
+        }
+    ]
+}

lib/main.dart

@@ -2,6 +2,7 @@ import 'package:auto_size_text/auto_size_text.dart';
 import 'package:cloudtech_calculator/theme_model.dart';
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
+import 'route.dart';
 
 enum Operation {
   plus,
@@ -256,7 +257,10 @@ class _MyHomePageState extends State<MyHomePage> {
               icon: const Icon(Icons.settings),
               tooltip: 'Show Snackbar',
               onPressed: () {
-                Provider.of<ThemeModel>(context, listen: false).toggleTheme();
+                Navigator.push(
+                  context,
+                  MaterialPageRoute(builder: (context) => SecondRoute()),
+                );
               },
               color: Theme.of(context).accentColor,
             )

lib/route.dart

@@ -0,0 +1,52 @@
+import 'package:cloudtech_calculator/theme_model.dart';
+import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
+
+class SecondRoute extends StatefulWidget {
+  @override
+  _SecondRouteState createState() => _SecondRouteState();
+}
+
+class _SecondRouteState extends State<SecondRoute> {
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: Text("Настройки калькулятора",
+            style: TextStyle(color: Theme.of(context).accentColor)),
+        shadowColor: const Color(0x00000000),
+      ),
+      body: Container(
+          color: Theme.of(context).primaryColor,
+          child: Padding(
+            padding: const EdgeInsets.all(8.0),
+            child: ListView(
+              padding: const EdgeInsets.all(8),
+              children: [
+                ListTile(
+                  leading: IconButton(
+                      icon: Icon(
+                        Icons.settings_display,
+                        color: Theme.of(context).accentColor,
+                      ),
+                      onPressed: null),
+                  title: Text(
+                    "Светлая тема",
+                    style: TextStyle(
+                        fontWeight: FontWeight.w500,
+                        color: Theme.of(context).accentColor),
+                  ),
+                  trailing: Switch(
+                    value: Theme.of(context).brightness == Brightness.light,
+                    onChanged: (value) {
+                      Provider.of<ThemeModel>(context, listen: false)
+                          .toggleTheme();
+                    },
+                  ),
+                )
+              ],
+            ),
+          )),
+    );
+  }
+}

lib/theme.dart

@@ -1,13 +1,15 @@
 import 'package:flutter/material.dart';
 
-ThemeData darkTheme = ThemeData.dark().copyWith(
+ThemeData darkTheme = ThemeData(
   primaryColor: const Color(0xff131618),
   accentColor: Colors.white,
+  brightness: Brightness.dark,
   textTheme: const TextTheme(bodyText2: TextStyle(color: Color(0xffffffff))),
 );
 
-ThemeData lightTheme = ThemeData.light().copyWith(
+ThemeData lightTheme = ThemeData(
   primaryColor: Colors.white,
   accentColor: Colors.green,
+  brightness: Brightness.light,
   textTheme: const TextTheme(bodyText2: TextStyle(color: Colors.green)),
 );