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lib/theme/extensions/app_theme_extensions.dart

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+// Flutter imports:
+import 'package:flutter/material.dart';
+
+///
+/// Расширение для темы всего приложения
+/// Для [Theme]
+///
+/// Используется для хранения общих типов цветов
+///
+class AppThemeExtension extends ThemeExtension<AppThemeExtension> {
+  AppThemeExtension({
+    required this.background,
+    required this.textColor,
+    required this.appBarBackground,
+  });
+
+  AppThemeExtension.light()
+      : background = Colors.white,
+        textColor = Colors.black,
+        appBarBackground = Colors.indigo;
+
+  AppThemeExtension.dark()
+      : background = Colors.black,
+        textColor = Colors.white,
+        appBarBackground = Colors.lightGreen;
+
+  /// Цвет фона
+  final Color background;
+
+  /// Цвет текста
+  final Color textColor;
+
+  /// Цвет фона [AppBar]
+  final Color appBarBackground;
+
+  @override
+  ThemeExtension<AppThemeExtension> copyWith({
+    Color? background,
+    Color? textColor,
+    Color? appBarBackground,
+  }) {
+    return AppThemeExtension(
+      background: background ?? this.background,
+      textColor: textColor ?? this.textColor,
+      appBarBackground: appBarBackground ?? this.appBarBackground,
+    );
+  }
+
+  @override
+  ThemeExtension<AppThemeExtension> lerp(
+    ThemeExtension<AppThemeExtension>? other,
+    double t,
+  ) {
+    if (other is! AppThemeExtension) {
+      return this;
+    }
+
+    return AppThemeExtension(
+      background: Color.lerp(background, other.background, t)!,
+      textColor: Color.lerp(textColor, other.textColor, t)!,
+      appBarBackground:
+          Color.lerp(appBarBackground, other.appBarBackground, t)!,
+    );
+  }
+}