Problem with dynamic language change in QML
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wrote on 20 Apr 2018, 08:16 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();
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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();
@bgfortran
have you checked if your loading is successfull?qDebug() << "Englisch loaded?" << trEN.load(":/english.qm");
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wrote on 20 Apr 2018, 09:04 last edited by
@J.Hilk said in Problem with dynamic language change in QML:
Englisch
BG loaded? true Englisch loaded? true
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wrote on 20 Apr 2018, 12:14 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
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wrote on 23 Apr 2018, 15:11 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") }
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wrote on 23 Apr 2018, 16:33 last edited by
@bgfortran maybe this wiki post can help you a little bit.
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wrote on 24 Apr 2018, 08:07 last edited by
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. -
wrote on 24 Apr 2018, 10:23 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(); }
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wrote on 25 Apr 2018, 11:03 last edited by
If I stop the debugging after qApplication->installTranslator() and after a long time continue- the operation is successful
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wrote on 25 Apr 2018, 16:39 last edited by
@bgfortran How are you calling switchTranslator(...) from qml ?
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