fast_i18n 1.3.0

Lightweight i18n solution. Use JSON files to create typesafe translations.

fast_i18n

Lightweight i18n solution. Use JSON files to create typesafe translations.

Getting Started

Step 1: Add dependencies

dependencies:
  fast_i18n: ^1.2.0

dev_dependencies:
  build_runner: any

Step 2: Create JSON files

Create these files inside your lib directory. Preferably in one common package like lib/i18n.

strings.i18n.json

{
  "hello": "Hello $name",
  "save": "Save",
  "login": {
    "success": "Logged in successfully",
    "fail": "Logged in failed"
  }
}

strings_de.i18n.json

{
  "hello": "Hallo $name",
  "save": "Speichern",
  "login": {
    "success": "Login erfolgreich",
    "fail": "Login fehlgeschlagen"
  }
}

Step 3: Generate the dart code

flutter packages pub run build_runner build

Step 4: Initialize

@override
void initState() {
  super.initState();

  // a: use device locale
  LocaleSettings.useDeviceLocale().whenComplete(() {
    setState((){});
  });

  // b: use specific locale
  LocaleSettings.setLocale('de');

  // c: use default locale (default json locale)
  // *do nothing*
}

Step 4b: iOS-only

File: ios/Runner/Info.plist

<key>CFBundleLocalizations</key>
<array>
   <string>en</string>
   <string>de</string>
</array>

Step 5: Use your translations

// raw string
String translated = t.hello(name: 'Tom');

// inside component
Text(t.login.success)

API

When the dart code has been generated, you will see some useful classes and functions

t - the most important translate variable

LocaleSettings.useDeviceLocale() - use the locale of the device

LocaleSettings.setLocale('de') - change the locale

LocaleSettings.currentLocale - get the current locale

Additional features

Maps

Sometimes you need to access the translations via keys. A solution is to use a map. Add the #map as a key to enable this. Keep in mind that you use it rarely because all nice features like autocompletion are gone.

{
  "welcome": "Welcome",
  "thisIsAMap": {
    "#map": "", // value is not important here
    "hello world": "hello"
  },
  "classicClass": {
    "hello": "hello"
  }
}

Now you can access this via key:

String a = t.thisIsAMap['hello world'];
String b = t.classicClass.hello; // the "classical" way

Lists

Lists are fully supported.

{
  "niceList": [
    "hello",
    "nice",
    [
      "nestedList"
    ],
    {
      "wow": "wow"
    },
    {
      "#map": "",
      "cool": "cool"
    }
  ]
}

String a = t.niceList[1];
String b = t.niceList[3].wow;
String c = t.niceList[4]['cool'];

License

MIT License

Copyright (c) 2020 Tien Do Nam

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.