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Problem with dynamic language change in QML

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  • B Offline
    B Offline
    bgfortran
    wrote on 20 Apr 2018, 08:16 last edited by bgfortran
    #5

    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 1 Reply Last reply 20 Apr 2018, 08:22
    0
    • B bgfortran
      20 Apr 2018, 08:16

      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 Offline
      J Offline
      J.Hilk
      Moderators
      wrote on 20 Apr 2018, 08:22 last edited by
      #6

      @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


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

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      • B Offline
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        bgfortran
        wrote on 20 Apr 2018, 09:04 last edited by
        #7

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

        Englisch

        BG loaded? true
        Englisch loaded? true
        
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        • B Offline
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          bgfortran
          wrote on 20 Apr 2018, 12:14 last edited by
          #8

          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

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          • J Offline
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            johngod
            wrote on 23 Apr 2018, 15:11 last edited by
            #9

            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")
            	}
            
            
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            • P Offline
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              Pablo J. Rogina
              wrote on 23 Apr 2018, 16:33 last edited by
              #10

              @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

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              • B Offline
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                bgfortran
                wrote on 24 Apr 2018, 08:07 last edited by
                #11

                @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.

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                • B Offline
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                  bgfortran
                  wrote on 24 Apr 2018, 10:23 last edited by
                  #12

                  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();
                  }
                  
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                  • B Offline
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                    bgfortran
                    wrote on 25 Apr 2018, 11:03 last edited by
                    #13

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

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                    • J Offline
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                      johngod
                      wrote on 25 Apr 2018, 16:39 last edited by
                      #14

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

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                      25 Apr 2018, 16:39

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