Constant Dark Theme

lib/theme_manager.dart

@@ -0,0 +1,45 @@
+import 'package:flutter/material.dart';
+import 'package:witl/storage_manager.dart';
+
+class ThemeNotifier with ChangeNotifier {
+  final darkTheme = ThemeData(
+    primaryColor: Colors.black,
+    brightness: Brightness.dark,
+    dividerColor: Colors.black12, colorScheme: ColorScheme.fromSwatch(primarySwatch: Colors.grey).copyWith(background: const Color(0xFF212121)),
+  );
+
+  final lightTheme = ThemeData(
+    primaryColor: Colors.white,
+    brightness: Brightness.light,
+    dividerColor: Colors.white54, colorScheme: ColorScheme.fromSwatch(primarySwatch: Colors.grey).copyWith(background: const Color(0xFFE5E5E5)),
+  );
+
+  late ThemeData _themeData;
+  ThemeData getTheme() => _themeData;
+
+  ThemeNotifier() {
+    StorageManager.readData('themeMode').then((value) {
+      'value read from storage: ' + value.toString();
+      var themeMode = value ?? 'light';
+      if (themeMode == 'light') {
+        _themeData = lightTheme;
+      } else {
+        'setting dark theme';
+        _themeData = darkTheme;
+      }
+      notifyListeners();
+    });
+  }
+
+  void setDarkMode() async {
+    _themeData = darkTheme;
+    StorageManager.saveData('themeMode', 'dark');
+    notifyListeners();
+  }
+
+  void setLightMode() async {
+    _themeData = lightTheme;
+    StorageManager.saveData('themeMode', 'light');
+    notifyListeners();
+  }
+}