QTranslator loaded but no translation is done for QWidget object.

  • hi
    I am learning a bit on the translation of the application. I managed to do it with UI designer, but as to those not-UI object, I couldn't translation the text, like the label or button and so on. But the simple code I wrote can translate the content in the QMessageBox. So could someone have a look and tell me the problem.? and I still not don't know what is the difference between UI object and QWidget object when doing language translation.


    .pro file
    TEMPLATE = app
    TARGET = lang
    QT += core gui
    greaterThan(QT_MAJOR_VERSION, 4) : QT += widgets
    TRANSLATIONS = se.ts
    HEADERS += \
    SOURCES += \
        mainwindow.cpp \
    .h file
    #include <QMainWindow>
    #include <QTranslator>
    #include <QPushButton>
    #include <QMessageBox>
    class MainWindow : public QMainWindow {
       explicit  MainWindow();
    private slots:
        void translate();
        void clickMe();
        void changeEvent(QEvent *event);
        QPushButton *m_button;
        QPushButton *m_button1;
        QTranslator * m_translator;
    #endif // MAINWINDOW_H
    .cpp file
    #include "mainwindow.h"
    #include <QApplication>
    #include <QDebug>
        m_button = new QPushButton(QObject::tr("clike me"), this);
        m_button1 = new QPushButton(QObject::tr("change lang"), this);
        m_button->setGeometry(60, 50, 100, 30);
        connect(m_button, SIGNAL(clicked()), this, SLOT(clickMe()));
        connect(m_button1, SIGNAL(clicked()), this, SLOT(translate()));
    void MainWindow::clickMe() {
        QMessageBox::information(this, QObject::tr("This is the title"), QObject::tr("happy birthday"),QMessageBox::Yes);
    void MainWindow::translate() {
        m_translator = new QTranslator;
        if (m_translator->load("se", "/Users/xxlanginsweden/Documents/QT/lang")) {
            qDebug() << "Load ok";
        } else {
            qDebug() << "Not ok";
    void MainWindow::changeEvent(QEvent *event) {
        if (event->type() == QEvent::LanguageChange)

  • Lifetime Qt Champion

    Hi and welcome to devnet,

    You can see how it's done in the Dynamic Translation part of the internationalization doc.

    The method described there is done for you when you use a designed built widget.

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