Merge pull request #76 from mario-bermonti:mario-bermonti/issue75

Translate demographics survey elements into Spanish

assets/lang/en.json

@@ -0,0 +1,2 @@
+{
+}

assets/lang/es.json

@@ -0,0 +1,2 @@
+{
+}

lib/src/app.dart

@@ -1,6 +1,10 @@
 import 'package:flutter/material.dart';
+import 'package:flutter_localizations/flutter_localizations.dart';
 import 'package:get/get.dart';
 import 'package:mdigit_span_tasks_ema/src/routes.dart';
+import 'package:research_package/research_package.dart';
+
+import 'intl/internationalization.dart';
 
 class MyApp extends StatelessWidget {
   const MyApp({super.key});
@@ -13,6 +17,10 @@ class MyApp extends StatelessWidget {
       initialRoute: '/',
       theme: ThemeData(primarySwatch: Colors.grey),
       getPages: routes,
+      locale: locale,
+      supportedLocales: supportedLocales,
+      localizationsDelegates: localizationsDelegates,
+      localeResolutionCallback: resolveLocale,
     );
   }
 }

lib/src/intl/internationalization.dart

@@ -0,0 +1,33 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_localizations/flutter_localizations.dart';
+import 'package:research_package/research_package.dart';
+
+/// default locale
+const Locale locale = Locale('es');
+
+const List<Locale> supportedLocales = <Locale>[
+  Locale('es'),
+  Locale('en'),
+];
+
+final List<LocalizationsDelegate> localizationsDelegates =
+    <LocalizationsDelegate>[
+  RPLocalizations.delegate,
+  GlobalMaterialLocalizations.delegate,
+  GlobalWidgetsLocalizations.delegate,
+  GlobalCupertinoLocalizations.delegate,
+];
+
+/// Resolves the [Locale] to the last one in the list of [supportedLocales]
+/// if the [locale] is unsupported.
+Locale? resolveLocale(Locale? locale, Iterable<Locale>? supportedLocales) {
+  if (locale == null || supportedLocales == null) {
+    return null;
+  }
+  for (Locale supportedLocale in supportedLocales) {
+    if (supportedLocale.languageCode == locale.languageCode) {
+      return supportedLocale;
+    }
+  }
+  return supportedLocales.last;
+}

pubspec.yaml

@@ -31,6 +31,8 @@ dependencies:
   get_storage: ^2.1.1
   freezed_annotation: ^2.4.2
   json_annotation: ^4.9.0
+  flutter_localizations:
+    sdk: flutter
 
 dev_dependencies:
   flutter_test:
@@ -49,6 +51,7 @@ flutter:
   uses-material-design: true
   assets:
     - assets/demographics_questions/
+    - assets/lang/
 
 flutter_launcher_icons:
   android: true

test/src/intl/internationalization_test.dart

@@ -0,0 +1,59 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:mdigit_span_tasks_ema/src/intl/internationalization.dart';
+
+void main() {
+  group('resolveLocale', () {
+    test(
+      "Given valid locale and supported locales, returns the locale.",
+      () {
+        const Locale expectedLocale = Locale('en');
+        final Iterable<Locale> supportedLocales = <Locale>[
+          const Locale('en'),
+          const Locale('es'),
+        ];
+
+        final Locale? actualLocale = resolveLocale(
+          expectedLocale,
+          supportedLocales,
+        );
+
+        expect(actualLocale, expectedLocale);
+      },
+    );
+  });
+  test(
+    """Given an unsupported locale and valid supported locales, 
+    returns Locale('es').""",
+    () {
+      const Locale locale = Locale('fr');
+      final Iterable<Locale> supportedLocales = <Locale>[
+        const Locale('en'),
+        const Locale('es'),
+      ];
+
+      final Locale? actualLocale = resolveLocale(
+        locale,
+        supportedLocales,
+      );
+
+      expect(actualLocale, supportedLocales.last);
+    },
+  );
+  test(
+    "Given a null locale and valid supported locales, returns null.",
+    () {
+      final Iterable<Locale> supportedLocales = <Locale>[
+        const Locale('en'),
+        const Locale('es'),
+      ];
+
+      final Locale? actualLocale = resolveLocale(
+        null,
+        supportedLocales,
+      );
+
+      expect(actualLocale, isNull);
+    },
+  );
+}