add structure

lib/model/language_model.dart

@@ -0,0 +1,45 @@
+import 'package:flutter/painting.dart';
+import 'package:fcs/model/base_model.dart';
+import 'package:fcs/model/shared_pref.dart';
+import 'package:fcs/vo/setting.dart';
+import 'package:fcs/widget/localization/transalation.dart';
+
+class LanguageModel extends BaseModel {
+  String language;
+  bool isEng = true;
+  static final List<String> languageCodesList =
+      Translation().supportedLanguagesCodes;
+  static final List<String> languagesList = Translation().supportedLanguages;
+
+  final Map<dynamic, dynamic> languagesMap = {
+    languagesList[0]: languageCodesList[0],
+    languagesList[1]: languageCodesList[1],
+  };
+
+  void initSetting(Setting setting) async {
+    this.language = await load();
+    this.isEng = this.language == "English";
+    Translation().onLocaleChanged(Locale(languagesMap[language]));
+    notifyListeners();
+  }
+
+
+  @override
+  logout() async {
+  }
+
+  Future<String> load() async {    
+    var data =await  SharedPref.getLang();
+    if (data == null) return languagesList[1];
+    return data;
+  }
+
+  void saveLanguage(String language) async {
+    Translation().onLocaleChanged(Locale(languagesMap[language]));
+
+    SharedPref.saveLang(language);
+    this.language = language;
+    this.isEng = this.language == "English";
+    notifyListeners();
+  }
+}