LanguageService.h

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#pragma once
 
#include <QObject>
#include <QString>
#include <QTranslator>
#include <QVariantList>
 
class QApplication;
class QQmlEngine;
 
namespace ui {

class LanguageService : public QObject {
  Q_OBJECT
  Q_PROPERTY(QString currentLanguage READ currentLanguage WRITE
                 setCurrentLanguage NOTIFY currentLanguageChanged)
  Q_PROPERTY(QVariantList availableLanguages READ availableLanguages NOTIFY
                 availableLanguagesChanged)
 
public:
  explicit LanguageService(QApplication* application, QQmlEngine* engine,
                           QObject* parent = nullptr);

  QString currentLanguage() const {
    return currentLanguage_;
  }

  void setCurrentLanguage(const QString& languageCode);

  QVariantList availableLanguages() const {
    return availableLanguages_;
  }

  Q_INVOKABLE bool applyLanguage(const QString& languageCode);
 
signals:
  void currentLanguageChanged();

  void availableLanguagesChanged();
 
private:
  void refreshAvailableLanguages();
  bool isLanguageAvailable(const QString& languageCode) const;
  QString normalizeLanguageCode(const QString& languageCode) const;
  QString translationFileName(const QString& languageCode) const;
  bool translationFileExists(const QString& languageCode) const;
  bool applyCurrentLanguage(const QString& languageCode);
  bool loadTranslation(const QString& languageCode);
  void retranslateUi();
  void persistLanguage(const QString& languageCode);
  QString persistedLanguage() const;
 
  QApplication* application_ = nullptr;
  QQmlEngine* engine_ = nullptr;
  QTranslator translator_;
  QVariantList availableLanguages_;
  QString currentLanguage_;
};
 
} // namespace ui