Until this package reaches 1.0.0, every version update could contain breaking changes. I'll try to deprecate things a few versions ahead

Signal translator

This is a translation package for the Signals framework. It's not a pluralization package.

For my own project, I needed a lightweight translation solution that could be used in dart. I previously used the easy_localization package, but I didn't like how it made my app re-render. This is not because of the package itself, but because I'm a Signals enthusiast. This package currently fits all my needs, but it might not fit yours. Please read the (non) features section to see if this package fits your needs. And feel free to open an issue or a PR if you want to add something.

License

Licensed under a MIT License.

(Non) features

• Supports singular and pluralization
• Display app in system language by default
• Support setting a different language
• Supports setting system language as default
• Only supports JSON translation files
• Does not support dates

Getting started

important

1. All the components that use translations must use some kind of Watch functionality as described in the Signals package.
2. Text widgets cannot be constants anymore, since their Signals. Although this completely logical, it might have some impact on performance.

Steps

1. In root, create a folder called assets/translations/
2. In the assets/translations/ folder, create a JSON file for each language you want to support. The name of the file should be the language code (e.g. en.json, fr.json, etc.). The content of the file should be a JSON object with key-value pairs for each translation:

{
  "language": "English",
  "translations": {
    "example translation": "example translation",
    "example translation 2": "example translation 2"
  }
}

3. Add the following to your pubspec.yaml file:

dependencies:
  signals_translator: ^0.0.3
  
  [...]
  
  flutter:
  assets:
    - assets/translations/

Then run flutter pub get to install the package.

4. Add a widget that needs translating

import 'package:signals/signals_flutter.dart';
import 'package:signals_translator/signals_translator.dart';

Watch(
  (context) => Text(
    tl('example translation'), 
  )
);

5. To set the language, you can use the setLanguage method of the SignalTranslator class. This method takes a String parameter that represents the language code (e.g. en, fr, etc.).

SignalTranslator().setLanguage('en');

5. To view the currently set language:

SignalTranslator().currentLocale;

This is done automatically when the app starts, but if you want to build in a language selector, you can use this method to highlight the currently selected language.

Examples

Basic translation (tl)

{
  "English": "English"
}

Text(tl('English'));

Translation with a variable (tlv)

"{0} has won the game!": "{0} has won the game!"

Text(tlv('{0} has won the game!', 'David'));

Translation with multiple variables (tlvm)

"He came in {0}, while his partner came in at the {1} place": "He came in {0}, while his partner came in at the {1} place",

Text(tlvm('He came in {0}, while his partner came in at the {1} place', ['first', 'second']));

Pluralization (tlp)

    "I have {0} apples": {
      "zero": "I have no apples",
      "one": "I have 1 apple",
      "other": "I have {0} apples"
    },

Text(tlp('I have {0} apples', 0)); // I have no apples
Text(tlp('I have {0} apples', 1)); // I have 1 apple
Text(tlp('I have {0} apples', 5)); // I have 5 apples

Pluralization with multiple counts (tlpm)

"I have {0} strawberries and {1} bananas": {
  "zero_zero": "I have no strawberries and no bananas",
  "one_one": "I have 1 strawberry and 1 banana",
  "one_other": "I have 1 strawberry and {1} bananas",
  "other_one": "I have {0} strawberries and 1 banana",
  "other_other": "I have bo strawberries and {1} bananas"
}

Text(tlpm('I have {0} strawberries and {1} bananas', [1, 1])); // I have 1 strawberry and 1 banana
Text(tlpm('I have {0} strawberries and {1} bananas', [0, 0])); // I have no strawberries and no bananas
Text(tlpm('I have {0} strawberries and {1} bananas', [2, 3])); // I have bo strawberries and 3 bananas

Note on pluralization:

For English, the text 'I have no strawberries and no bananas' is grammarly same as 'I have 0 strawberries and 0 bananas'. That means that you don't have to add a 'zero' entry for 'no strawberries and no bananas'. zero and other is sufficient. But for See the 'example' folder for a complete example.

Development

Publish extension using dart pub publish --dry-run

Considerations

• Plural 'like there are / is 5 / winners' is not supported yet, might consider ICU here for the future..