multi lingual support file

localization.dart

import 'dart:async';
import 'package:flutter/material.dart';
import 'package:flutter/foundation.dart' show SynchronousFuture;

class UnicomputeLocalizations {
  UnicomputeLocalizations(this.locale);

  final Locale locale;

  static UnicomputeLocalizations of(BuildContext context) {
    return Localizations.of<UnicomputeLocalizations>(context, UnicomputeLocalizations);
  }

  String operator [](String label) => _localizedValues[locale.languageCode][label];

  static Map<String, Map<String, String>> get localizedValues => _localizedValues;

  static Map<String, Map<String, String>> _localizedValues = {};
}

class UnicomputeLocalizationsDelegate extends LocalizationsDelegate<UnicomputeLocalizations> {
  const UnicomputeLocalizationsDelegate();

  @override
  bool isSupported(Locale locale) => UnicomputeLocalizations._localizedValues.keys.contains(locale.languageCode);

  @override
  Future<UnicomputeLocalizations> load(Locale locale) {
    return SynchronousFuture<UnicomputeLocalizations>(UnicomputeLocalizations(locale));
  }

  @override
  bool shouldReload(UnicomputeLocalizationsDelegate old) => false;
  Iterable<Locale> get supportedLocales => UnicomputeLocalizations.localizedValues.keys.map((lang) => Locale(lang));
}