App Translations

Implement multilingual support in your Fyne applications using JSON translation files and dynamic switching between languages.

Usage

Show Code

package main

import (
  "encoding/json"
  "log"
  "os"

  "fyne.io/fyne/v2"
  "fyne.io/fyne/v2/app"
  "fyne.io/fyne/v2/container"
  "fyne.io/fyne/v2/widget"
)

/*translations.json
{
  "en": {
    "hello": "Hello",
    "welcome": "Welcome to my app"
  },
  "fr": {
    "hello": "Bonjour",
    "welcome": "Bienvenue dans mon application"
  },
  "sw": {
    "hello": "Hujambo",
    "welcome": "Karibu kwenye programu yangu"
  }
}

*/

// Translator struct for JSON
type Translator struct {
  Translations map[string]map[string]string
}

// Load from file
func LoadTranslations(filename string) (*Translator, error) {
  data, err := os.ReadFile(filename)
  if err != nil {
    return nil, err
  }

  var t Translator
  err = json.Unmarshal(data, &t.Translations)
  if err != nil {
    return nil, err
  }

  return &t, nil
}

// Get translation
func (t *Translator) Translate(lang, key string) string {
  if val, ok := t.Translations[lang][key]; ok {
    return val
  }
  return key // fallback
}

func main() {
  a := app.New()
  w := a.NewWindow("App Translations")

  // Load JSON translations
  translator, err := LoadTranslations("translations.json")
  if err != nil {
    log.Fatal("Error loading translations:", err)
  }

  // Default language
  lang := "en"

  helloLabel := widget.NewLabel(translator.Translate(lang, "hello"))
  welcomeLabel := widget.NewLabel(translator.Translate(lang, "welcome"))

  // Language selector
  langSelect := widget.NewSelect([]string{"en", "fr", "sw"}, func(selected string) {
    lang = selected
    helloLabel.SetText(translator.Translate(lang, "hello"))
    welcomeLabel.SetText(translator.Translate(lang, "welcome"))
  })

  langSelect.SetSelected("en") // default English

  w.SetContent(container.NewVBox(
    widget.NewLabel("🌍 Select Language:"),
    langSelect,
    helloLabel,
    welcomeLabel,
  ))

  w.Resize(fyne.NewSize(350, 200))
  w.ShowAndRun()
}