locale_switcher_dev 0.11.2

A minimalistic widget for switching the locale of your application with 4 lines of code.

locale_switcher_dev

A widget for switching the locale of your application.

Content

• About
• Setup
• Features
• Usage
• Example
• Todo
• FAQ

About

This package will dynamically generate version of package locale_switcher which allows you to add locale-switching functionality to your app with just 2 lines of code.

Unlike locale_switcher, it required a few more lines to set up, but allow you to control which flags are included (or none) and which packages it depend on (or none). See setup below.

Setup

Full example of pubspec.yaml online.

This package should be in 'dev_dependencies:' section of pubspec.yaml. You will also needed to add generated package into 'dependencies:' section, like this:

locale_switcher:
  # please note: these are country codes, not language codes!
  flags: [ 'us', 'vn', 'de' ]  # generated package will only have these svg flags, full list here https://github.com/cedvdb/flutter_circle_flags/tree/main/assets/svg
  # also can be bool value:
  # flags: true - by default(include all flags), set to false to not include flags
  shared_preferences: false    # default - true
  #easy_localization: false    # default - false, set true if you use easy_localization
  # Note: after changing these lines, run:  dart run build_runner build

dependencies:
  locale_switcher: # version should be empty or any
    # this will be generated by: dart run build_runner build   (you need to run this command first, then add `path` line)
    path: lib/src/packages/locale_switcher

dev_dependencies:
  locale_switcher_dev: # this package

The locale_switcher is NOT a localization package, it is just a few useful widgets that extend functionality of localization systems, such as: intl, easy_localization, etc...

Features

• LocaleManager widget:

  • optionally: load/stores the last selected locale in SharedPreferences,
  • update locale of app (listen to notifier and rebuild MaterialApp),
  • observes changes in the system locale,

• LocaleSwitcher - a widget to switch locale:

  • show a list of locales and special option to use system locale,
  • constructor LocaleSwitcher.segmentedButton,
  • constructor LocaleSwitcher.menu,
  • constructor LocaleSwitcher.custom,
  • constructor LocaleSwitcher.iconButton - button/indicator which open popup window to select locale,

• Some other helpers:

  • LangIconWithToolTip class with additional constructor forIconBuilder ,
  • showSelectLocaleDialog.

Usage

1. Wrap MaterialApp or CupertinoApp with LocaleManager (example for intl package):

  @override
Widget build(BuildContext context, WidgetRef ref) {
  return LocaleManager(
      child: MaterialApp(
          locale: LocaleSwitcher.localeBestMatch,
          supportedLocales: AppLocalizations.supportedLocales,
          localizationsDelegates: AppLocalizations.localizationsDelegates,
  //...

2. Add LocaleSwitcher widget anywhere into your app.

Troubleshooting

Note: localization should be set up before you start to use this package, if there some problems - please, check next section and/or documentation of localization system you use, before reporting bug.

Check that intl package is setup correctly:

The following instructions are from intl package, so you probably already did them:

In pubspec.yaml:

dependencies: # in this section
  intl:
  flutter_localizations:
    sdk: flutter
dev_dependencies: # in this section 
  build_runner:
flutter: # in this section 
  generate: true  

Optionally - in l10n.yaml:

arb-dir: lib/src/l10n
template-arb-file: intl_en.arb
output-dir: lib/src/l10n/generated
output-localization-file: app_localizations.dart
untranslated-messages-file: desiredFileName.txt
preferred-supported-locales: [ "en", "vi", "de" ]
nullable-getter: false

Example

With intl package:

Online Example here

• Example Code (recommended).

Another example code: LocaleSwitcher used without LocaleManager(not recommended).

Example with dynamic option switch: here.

With easy_localization package:

locale_switcher_dev + easy_localization: https://github.com/Alexqwesa/locale_switcher/tree/builder/examples/easy_localization (recommended)

locale_switcher + easy_localization: https://github.com/Alexqwesa/locale_switcher/tree/main/examples/easy_localization

TODO:

• Test with other localization system (currently: tested only intl and easy_localization)
• Support slang
• Option to use .svg.vec instead of .svg
• LocaleSwitcher: callback to all constructors

FAQ

- How to change order of languages?

Languages are shown in the same order as they listed in l10n.yaml.

- How to change flag of language?

Use LocaleManager.reassign parameter like this:

LocaleManager(
  reassign: {'en': ['GB', 'English', <Your_icon_optional>]}
  // (first two options are required, third is optional)
  // first option is the code of country which flag you want to use
...
)

- How to use localization outside of MaterialApp(or CupertinoApp)?

Here is a useful example, although it is not depend on this package:

import 'package:flutter_gen/gen_l10n/app_localizations.dart';

/// Access localization through locale
extension LocaleWithDelegate on Locale {
  /// Get class with translation strings for this locale.
  AppLocalizations get tr => lookupAppLocalizations(this);
}

Locale("en").tr.example
// or 
LocaleManager.locale.value.tr.example