Playx Localization #

Simplify app localization management with Playx Localization. This package offers a straightforward implementation and a wealth of utilities to manage and update app localization effortlessly.

Features 🔥 #

Easy Locale Management: Create and manage app locales with the ability to easily switch between them.
Context-Free Localization: No need for BuildContext anymore, making localization even simpler.
Dart Isolate Support: Supports Dart isolates for background localization tasks.
Multiple File Formats: Load translations from JSON, CSV, Yaml, XML, and more.
React to Locale Changes: Automatically react to and persist locale changes within the app.
Advanced Localization: Supports plural, gender, nesting, RTL locales, and more.
Fallback Locale Handling: Define fallback locale keys for seamless localization fallbacks.

Installation #

Integrating Playx Localization into your Flutter project is straightforward. Follow these steps:

Add Dependency #

Include the following line in your pubspec.yaml file under the dependencies section:

playx_localization: ^0.1.0

Add Translation Files #

Organize your localization files within a translations folder under the assets directory. The files should follow a specific naming convention:

assets  
└── translations  
    ├── {languageCode}.{ext}                  
    └── {languageCode}-{countryCode}.{ext}

For example:

assets  
└── translations  
    ├── en.json  
    └── en-US.json

Declare Assets Localization #

Declare the localization directory in your pubspec.yaml:

flutter:  
  assets:  
    - assets/translations/

Loading Translations from Other Resources #

Playx Localization supports loading translations from various sources such as JSON, CSV, HTTP, XML, YAML files, etc. For more information, refer to Easy Localization Loader.

Note on iOS #

To enable translation on iOS devices, add supported locales to ios/Runner/Info.plist as described here.

Usage #

Utilizing Playx Localization in your app involves a few simple steps:

🔥Boot Core #

Initialize the Playx core package with your desired locale configuration:

void main() async {    
	WidgetsFlutterBinding.ensureInitialized();    
  
	await PlayXCore.bootCore();    
  
  // Define your supported locales and other configurations
	const locales = [  
	  XLocale(id: 'en', name: 'English', languageCode: 'en'),  
	  XLocale(id: 'ar', name: 'العربية', languageCode: 'ar'),  
	];  
  
	final config = PlayxLocaleConfig(  
	  supportedLocales: locales,  
	  startLocale: locales.first,  
	  fallbackLocale: locales.first,  
	  useFallbackTranslations: true,  
	);
	 // Boot Playx Localization with the defined configuration
	 await PlayxLocalization.boot(config: config);

	 runApp(const MyApp());
}

🔥 Use `PlayxLocalizationBuilder` Widget #

Wrap your MaterialApp or CupertinoApp with the PlayxLocalizationBuilder widget to listen to locale changes:

class MyApp extends StatelessWidget {    
  const MyApp({Key? key});    
    
  @override    
  Widget build(BuildContext context) {  
    return PlayxLocalizationBuilder(builder: (context, locale) {  
      return MaterialApp(  
        supportedLocales: PlayxLocalization.supportedLocales,  
        localizationsDelegates: PlayxLocalization.localizationDelegates,  
        locale: locale.locale,  
        home: const MyHomePage(),  
      );  
    });  
   }    
 }

🔥 PlayxLocaleConfig Properties #

Configure your localization preferences using the PlayxLocaleConfig properties:

Property	Required	Default	Description
supportedLocales	true		List of supported locales.
path	false	'assets/translations'	Path to the folder containing localization files.
assetLoader	false	`RootBundleAssetLoader()`	Loader for localization files. You can use custom loaders or the default loader provided.
fallbackLocale	false		The fallback locale used when the desired locale is not available in the supported locales list.
startLocale	false		The initial locale when the app starts. If null, it uses the device locale.
saveLocale	false	`true`	Save the chosen locale in the device's storage.
useFallbackTranslations	false	`true`	Use fallback translations if a localization key is not found in the locale file.
useOnlyLangCode	false	`false`	Use only language code for reading localization files.

Update App Locale #

Switch between locales using the PlayxLocalization facade:

FloatingActionButton.extended(  
  onPressed: () {  
    PlayxLocalization.updateByIndex(  
      PlayxLocalization.isCurrentLocaleArabic() ? 0 : 1
    );  
  },  
  label: Text('change_language'.tr),  
  icon: const Icon(Icons.update),  
)

🔥 Translate `tr()` #

The package uses `Easy Localization` under the hood to manage translations and Plurals as below.

Retrieve localized text using:

'text'.tr(context: context)
context.tr()
Text('text').tr(context: context)

Text('title').tr(context:context) //Text widget  
  
print('title'.tr(context:context)); //String  

var title = tr('title',context:context) // Static function  
  
Text(context.tr('title')) //Extension on BuildContext`

Providing context to the tr function ensures widgets are rebuilt correctly when the locale changes.
For classes without context, you can still use the tr function without context, though note that widgets will not rebuild on locale changes when used this way, But there is an option to force app update on locale change.

Arguments:

Pass arguments to the tr() function for dynamic translations:

Name	Type	Description
args	`List<String>`	List of localized strings. Replaces `{}` left to right
namedArgs	`Map<String, String>`	Map of localized strings. Replaces the name keys `{key_name}` according to its name
gender	`String`	Gender switcher. Changes the localized string based on gender string

Example:

{  
   "msg": "{} are written in the {} language",  
   "msg_named": "Playx localization is written in the {lang} language",  
   "msg_mixed": "{} are written in the {lang} language",  
   "gender": {  
      "male": "Hi man ;) {}",  
      "female": "Hello girl :) {}",  
      "other": "Hello {}"  
   }  
}

Use it like this:

// args  
Text('msg').tr(args: ['Playx localization', 'Dart']),  
  
// namedArgs  
Text('msg_named').tr(namedArgs: {'lang': 'Dart'}),  
  
// args and namedArgs  
Text('msg_mixed').tr(args: ['Playx localization'], namedArgs: {'lang': 'Dart'}),  
  
// gender  
Text('gender').tr(gender: _gender ? "female" : "male"),

🔥 Plurals `plural()` #

You can translate with pluralization.
To insert a number in the translated string, use {}. Number formatting supported, for more information read NumberFormat class documentation.

You can use extension methods of [String] or [Text] widget, you can also use plural() as a static function.

Arguments:

Name	Type	Description
value	`num`	Number value for pluralization
args	`List<String>`	List of localized strings. Replaces `{}` left to right
namedArgs	`Map<String, String>`	Map of localized strings. Replaces the name keys `{key_name}` according to its name
name	`String`	Name of number value. Replaces `{$name}` to value
format	`NumberFormat`	Formats a numeric value using a NumberFormat class

Example:

  "day": {  
    "zero":"{} дней",  
    "one": "{} день",  
    "two": "{} дня",  
    "few": "{} дня",  
    "many": "{} дней",  
    "other": "{} дней"  
  },  
  "money": {  
    "zero": "You not have money",  
    "one": "You have {} dollar",  
    "many": "You have {} dollars",  
    "other": "You have {} dollars"  
  },  
  "money_args": {  
    "zero": "{} has no money",  
    "one": "{} has {} dollar",  
    "many": "{} has {} dollars",  
    "other": "{} has {} dollars"  
  },  
  "money_named_args": {  
    "zero": "{name} has no money",  
    "one": "{name} has {money} dollar",  
    "many": "{name} has {money} dollars",  
    "other": "{name} has {money} dollars"  
  }  
}

⚠️ Key "other" required!

//Text widget with format  
Text('money').plural(1000000, format: NumberFormat.compact(locale: context.locale.toString())) // output: You have 1M dollars  
  
//String  
print('day'.plural(21)); // output: 21 день  
  
//Static function  
var money = plural('money', 10.23) // output: You have 10.23 dollars  
  
//Text widget with plural BuildContext extension  
Text(context.plural('money', 10.23))  
  
//Static function with arguments  
var money = plural('money_args', 10.23, args: ['John', '10.23'])  // output: John has 10.23 dollars  
  
//Static function with named arguments  
var money = plural('money_named_args', 10.23, namedArgs: {'name': 'Jane', 'money': '10.23'})  // output: Jane has 10.23 dollars  
var money = plural('money_named_args', 10.23, namedArgs: {'name': 'Jane'}, name: 'money')  // output: Jane has 10.23 dollars

🔥 Linked translations: #

If there's a translation key that will always have the same concrete text as another one you can just link to it. To link to another translation key, all you have to do is to prefix its contents with an @: sign followed by the full name of the translation key including the namespace you want to link to.

Example:

{  
  "example": {  
  "hello": "Hello",  
    "world": "World!",  
    "helloWorld": "@:example.hello @:example.world"  
  }  
}

print('example.helloWorld'.tr); //Output: Hello World!

You can also do nested anonymous and named arguments inside the linked messages.

Example:

{  
  "date": "{currentDate}.",  
  "dateLogging": "INFO: the date today is @:date"  
}

print(tr('dateLogging', namedArguments: {'currentDate': DateTime.now().toIso8601String()})); //Output: INFO: the date today is 2020-11-27T16:40:42.657.

Formatting linked translations:

Formatting linked locale messages
If the language distinguishes cases of character, you may need to control the case of the linked locale messages. Linked messages can be formatted with modifier @.modifier:key

The below modifiers are available currently.

upper: Uppercase all characters in the linked message.
lower: Lowercase all characters in the linked message.
capitalize: Capitalize the first character in the linked message.

Example:

{  
  "example": {  
  "fullName": "Full Name",  
    "emptyNameError": "Please fill in your @.lower:example.fullName"  
  }  
}

Output:

print('example.emptyNameError'.tr); //Output: Please fill in your full name

🔥 Get device locale `deviceLocale` #

Get device locale

Example:

print(${PlayxLocalization.deviceLocale.toString()}) // OUTPUT: en_US

🔥 Delete save locale `deleteSaveLocale()` #

Clears a saved locale from device storage

Example:

RaisedButton(  
  onPressed: (){  
    PlayxLocalization.deleteSaveLocale();  
  },  
  child: Text(LocaleKeys.reset_locale).tr(),  
)