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    Unsolved Problem with dynamic language change in QML

    QML and Qt Quick
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    • bgfortran
      bgfortran last edited by bgfortran

      I tried this way, but the result is the same :)

       QTranslator trBG;
        QTranslator trEN;
      
         trBG.load(":/bulgarian.qm");
         trEN.load(":/english.qm")
      
      if(lang == "bg") {
           appl->removeTranslator(&trEN);
           appl->installTranslator(&trBG);
          } else if (lang == "en") {
              appl->removeTranslator(&trBG);
              appl->installTranslator(&trEN);
          }
      
            qmlEngine->retranslate();
      
      J.Hilk 1 Reply Last reply Reply Quote 0
      • J.Hilk
        J.Hilk Moderators @bgfortran last edited by

        @bgfortran
        have you checked if your loading is successfull?

        qDebug() << "Englisch loaded?" << trEN.load(":/english.qm");
        

        Be aware of the Qt Code of Conduct, when posting : https://forum.qt.io/topic/113070/qt-code-of-conduct

        Qt Needs YOUR vote: https://bugreports.qt.io/browse/QTQAINFRA-4121


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        A: It's blue light.
        Q: What does it do?
        A: It turns blue.

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        • bgfortran
          bgfortran last edited by

          @J.Hilk said in Problem with dynamic language change in QML:

          Englisch

          BG loaded? true
          Englisch loaded? true
          
          1 Reply Last reply Reply Quote 0
          • bgfortran
            bgfortran last edited by

            I think that the QML is doesn't refresh. But why- i don't know. after install a new translator. The first time the Translator is worked, but in runtime it doesn't work

            1 Reply Last reply Reply Quote 0
            • johngod
              johngod last edited by

              Are you sure that switchTranslator() is being called ? Put some debbuging code inside to check it.
              Any way here is a sample from my projects that's tested and it works.

              main.cpp
              	
              #include "qmltranslator.h"
              
              void main() {
              	QGuiApplication app(argc, argv);
                  
                  QmlTranslator translator;
                  qmlRegisterType<QmlTranslator>("com.QMLTranslator", 1, 0, "QmlTranslator");
              
                  QQmlApplicationEngine engine;
                  engine.rootContext()->setContextProperty("qmlTranslator", &translator);
              
                  qDebug()<<"connection: "<<QObject::connect(&translator, SIGNAL(languageChanged()),
                                     &engine,  SLOT(retranslate()));
              
              }
              
              qmltranslator.h
              
              #ifndef QMLTRANSLATOR_H
              #define QMLTRANSLATOR_H
              
              #include <QTranslator>
              
              class QmlTranslator : public QObject
              {
                  Q_OBJECT
                  Q_PROPERTY(QString language READ language WRITE setLanguage NOTIFY languageChanged)
              public:
                  explicit QmlTranslator(QObject *parent = nullptr);
              
                  QString language(){return m_language;}
                  void setLocaleTranslation(){
                      if (!appTranslator.isEmpty())
                          qApp->removeTranslator(&appTranslator);
                      if (!appTranslator.load("file_" + QLocale::system().name(), qmPath)) //file_ is your qm file name
                          qWarning("Translation file not found");
                      qApp->installTranslator(&appTranslator);
                  }
              
              signals:
                  void languageChanged();
              
              public slots:
              
                  void setLanguage(QString language) {
                      if(language == m_language)
                        return;
                    m_language = language;
                    if (!appTranslator.isEmpty())
                        qApp->removeTranslator(&appTranslator);
              
                    appTranslator.load("file_" + language, qmPath);//file_ is your qm file name
                    qApp->installTranslator(&appTranslator);
              
                    emit languageChanged();
                  }
              
              private:
                  QTranslator appTranslator;
                  QString m_language;
                  QString qmPath;
              };
              
              #endif // QMLTRANSLATOR_H
              
              
              qmltranslator.cpp
              
              #include "qmltranslator.h"
              
              QmlTranslator::QmlTranslator(QObject *parent)
                  : QObject(parent)
              {
                  qmPath = ":/translations";
              }
              
              qml file
              
              import com.QMLTranslator 1.0
              ....
              	onSomeButtonClicked: {
              		qmlTranslator.setLanguage("pt")
              	}
              
              
              1 Reply Last reply Reply Quote 0
              • Pablo J. Rogina
                Pablo J. Rogina last edited by

                @bgfortran maybe this wiki post can help you a little bit.

                Upvote the answer(s) that helped you solve the issue
                Use "Topic Tools" button to mark your post as Solved
                Add screenshots via postimage.org
                Don't ask support requests via chat/PM. Please use the forum so others can benefit from the solution in the future

                1 Reply Last reply Reply Quote 0
                • bgfortran
                  bgfortran last edited by

                  @johngod

                  i created simple project with some code and it is Ok. I have to say that the language setting comes from a mobile application. Тhe language changes only when the application starts up. If Bulgarian is selected the my application reads this setting and loads the Bulgarian qml. But when the app is running and the change is made, the qml is not reloaded.
                  Important!!! All translators are loaded.

                  1 Reply Last reply Reply Quote 0
                  • bgfortran
                    bgfortran last edited by

                    Here is my code

                    Translator.h

                    class Translator: public QObject
                    {
                        Q_OBJECT
                    
                    public:
                        static QSharedPointer<Translator> getInstance();
                        virtual ~Translator();
                        void setQApplication(QApplication *app);
                        void setQmlEngine(QQmlApplicationEngine *qmlEn);
                        void switchTranslator(QString lang);
                    private:
                        explicit Translator(QObject *parent = 0);
                        static QSharedPointer<Translator> instance;
                    
                        QApplication *qApplication;
                        QQmlApplicationEngine *qmlEngine;
                    
                        QTranslator trBG;
                        QTranslator trEN;
                    
                    };
                    
                    

                    Translator.cpp

                    #include "Translator.h"
                    
                    QSharedPointer<Translator> Translator::instance = QSharedPointer<Translator>(nullptr);
                    Translator::Translator(QObject *parent) : QObject(parent)
                    {
                    
                        trBG.load(":/bg.qm");
                        trEN.load(":/en.qm");
                    }
                    
                    Translator::~Translator() {}
                    
                    QSharedPointer<Translator> Translator::getInstance()
                    {
                      if (instance.isNull()) {
                        instance = QSharedPointer<Translator>(new Translator());
                      }
                      return instance;
                    }
                    
                    void Translator::setQApplication(QApplication *app)
                    {
                        qApplication = app;
                    }
                    
                    void Translator::setQmlEngine(QQmlApplicationEngine *qmlEn)
                    {
                        qmlEngine = qmlEn;
                    }
                    
                    void Translator::switchTranslator(QString lang)
                    {
                        if(trBG.isEmpty()) {
                            qDebug()<<"The BG translator is empty!";
                        }
                    
                        if(trEN.isEmpty()) {
                            qDebug()<<"The EN translator is empty!";
                        }
                    
                        if(lang == "bg") {
                         qApplication->removeTranslator(&trEN);
                         qApplication->installTranslator(&trBG);
                        } else if (lang == "en") {
                         qApplication->removeTranslator(&trBG);
                         qApplication->installTranslator(&trEN);
                        }
                    
                        qmlEngine->retranslate();
                    }
                    
                    1 Reply Last reply Reply Quote 0
                    • bgfortran
                      bgfortran last edited by

                      If I stop the debugging after qApplication->installTranslator() and after a long time continue- the operation is successful

                      1 Reply Last reply Reply Quote 0
                      • johngod
                        johngod last edited by

                        @bgfortran How are you calling switchTranslator(...) from qml ?

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