Fixed version number in settings menu, added theme switcher.

lib/main.dart

@@ -1,6 +1,10 @@
 import 'dart:io';
 import 'package:flutter/material.dart';
+import 'package:package_info_plus/package_info_plus.dart';
+import 'package:provider/provider.dart';
 import 'package:quickgui/src/app.dart';
+import 'package:quickgui/src/mixins/app_version.dart';
+import 'package:quickgui/src/model/app_theme.dart';
 import 'package:quickgui/src/model/operating_system.dart';
 import 'package:quickgui/src/model/option.dart';
 import 'package:quickgui/src/model/version.dart';
@@ -47,6 +51,11 @@ void main() async {
   setWindowMinSize(const Size(692, 580));
   setWindowMaxSize(const Size(692, 580));
   gOperatingSystems = await loadOperatingSystems(false);
-
-  runApp(const App());
+  AppVersion.packageInfo = await PackageInfo.fromPlatform();
+  runApp(MultiProvider(
+    providers: [
+      ChangeNotifierProvider(create: (_) => AppTheme()),
+    ],
+    builder: (context, _) => const App(),
+  ));
 }

lib/src/app.dart

@@ -1,4 +1,6 @@
 import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
+import 'package:quickgui/src/model/app_theme.dart';
 import 'package:quickgui/src/pages/main_page.dart';
 
 class App extends StatefulWidget {
@@ -11,10 +13,13 @@ class App extends StatefulWidget {
 class _AppState extends State<App> {
   @override
   Widget build(BuildContext context) {
-    return MaterialApp(
-      theme: ThemeData(primarySwatch: Colors.pink),
-      darkTheme: ThemeData.dark(),
-      home: const MainPage(title: 'Quickgui - A Flutter frontend for Quickget and Quickemu'),
+    return Consumer<AppTheme>(
+      builder: (context, appTheme, _) => MaterialApp(
+        theme: ThemeData(primarySwatch: Colors.pink),
+        darkTheme: ThemeData.dark(),
+        themeMode: appTheme.themeMode,
+        home: const MainPage(title: 'Quickgui - A Flutter frontend for Quickget and Quickemu'),
+      ),
     );
   }
 }

lib/src/mixins/app_version.dart

@@ -1,6 +1,6 @@
 import 'package:package_info_plus/package_info_plus.dart';
 
-mixin VersionMixin {
+class AppVersion {
   static PackageInfo? packageInfo;
 
   String get appName => packageInfo?.appName ?? '';

lib/src/model/app_theme.dart

@@ -0,0 +1,11 @@
+import 'package:flutter/material.dart';
+
+class AppTheme extends ChangeNotifier {
+  ThemeMode? _themeMode;
+
+  ThemeMode get themeMode => _themeMode ?? ThemeMode.system;
+  set useDarkMode(bool useDarkMode) {
+    _themeMode = useDarkMode ? ThemeMode.dark : ThemeMode.light;
+    notifyListeners();
+  }
+}

lib/src/pages/main_page.dart

@@ -1,5 +1,3 @@
-import 'dart:io';
-
 import 'package:flutter/material.dart';
 import 'package:quickgui/src/widgets/home_page/logo.dart';
 import 'package:quickgui/src/widgets/home_page/main_menu.dart';

lib/src/widgets/left_menu.dart

@@ -1,20 +1,39 @@
+import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
-import 'package:quickgui/src/mixins/version_mixin.dart';
+import 'package:provider/provider.dart';
+import 'package:quickgui/src/mixins/app_version.dart';
+import 'package:quickgui/src/model/app_theme.dart';
 
-class LeftMenu extends StatelessWidget with VersionMixin {
+class LeftMenu extends StatelessWidget {
   const LeftMenu({Key? key}) : super(key: key);
 
   @override
   Widget build(BuildContext context) {
-    var _version = version + ' (' + buildNumber + ')';
-    return Drawer(
-      child: ListView(
-        children: [
-          ListTile(
-            title: Text("quickgui $_version", style: Theme.of(context).textTheme.headline6),
-          ),
-          const Divider(),
-        ],
+    var _version = AppVersion.packageInfo!.version;
+    return Consumer<AppTheme>(
+      builder: (context, appTheme, _) => Drawer(
+        child: ListView(
+          children: [
+            ListTile(
+              title: Text("quickgui $_version", style: Theme.of(context).textTheme.headline6),
+            ),
+            const Divider(),
+            Padding(
+              padding: const EdgeInsets.symmetric(horizontal: 16),
+              child: Row(
+                children: [
+                  const Text('Use dark mode'),
+                  Switch(
+                    value: Theme.of(context).brightness == Brightness.dark,
+                    onChanged: (value) {
+                      appTheme.useDarkMode = value;
+                    },
+                  ),
+                ],
+              ),
+            )
+          ],
+        ),
       ),
     );
   }

pubspec.yaml

@@ -44,6 +44,7 @@ dependencies:
   file_picker: ^4.1.6
   shared_preferences: ^2.0.8
   package_info_plus: ^1.3.0
+  provider: ^6.0.1
 
 dev_dependencies:
   flutter_test: