temp locale define

lib/src/locale.dart

@@ -0,0 +1,26 @@
+import 'dart:ui' as r;
+
+class Locale {
+  const Locale({required this.languageCode, this.areaCode});
+
+  factory Locale.from(String raw) {
+    final full = raw.toLowerCase();
+    for (final sep in ['-', '_']) {
+      if (full.contains(sep)) {
+        final parts = full.split(sep);
+        return Locale(languageCode: parts[0], areaCode: parts[1]);
+      }
+    }
+    return Locale(languageCode: full);
+  }
+
+  factory Locale.fromFrameLocale(r.Locale raw) =>
+      Locale(languageCode: raw.languageCode, areaCode: raw.countryCode);
+
+  final String languageCode;
+  final String? areaCode;
+
+  @override
+  String toString() =>
+      areaCode == null ? languageCode : '$languageCode-$areaCode';
+}