Embed qt translation into executable in static app

[Cobra91151]

Hello!

I want to embed the Qt translation files like: qt_en.qm, qt_uk.qm into my executable using resource. I have added it to the resource directory named Localization.

bool isLoaded = qtTranslator.load(QString(":Localization/qt_uk.qm"));
qDebug() << "isLoaded: " << isLoaded;

It returns false. When I add my translation file, for example: test_uk.qm then it loads successfully. So, how to embed the Qt translations files into the executable (static program)?

I think, I have found the issue, qt_uk.qm file size is only 1 KB, but when I check out for the same file for other program (shared), the file size is 155 KB. So, it means that Qt static also embeds the Qt localization files automatically? Then how to load them using QTranslator?

For example, I translated my program to ukrainian language but some widgets like QMessageBox buttons and QTreeView header items are still not translated:

This translation comes from Qt files not mine. I can call setButtonText to translate the QMessageBox buttons, but how to translate the QTreeView header items like (Name, Size, Type, Date modified) which added automatically by QFileSystemModel? There should be some way to call the default Qt translation for this?
Thanks.

[Cobra91151]

Ok. I have fixed the issue by inheriting the QFileSystemModel and overriding the headerData method. Now, it works as expected:

The issue is resolved. Thank you.

[Cobra91151]

I think, the only way is to subclass QFileSystemModel and override the headerData method.

QVariant QFileSystemModel::headerData(int section, Qt::Orientation orientation, int role) const
{
    switch (role) {
    case Qt::DecorationRole:
        if (section == 0) {
            // ### TODO oh man this is ugly and doesn't even work all the way!
            // it is still 2 pixels off
            QImage pixmap(16, 1, QImage::Format_Mono);
            pixmap.fill(0);
            pixmap.setAlphaChannel(pixmap.createAlphaMask());
            return pixmap;
        }
        break;
    case Qt::TextAlignmentRole:
        return Qt::AlignLeft;
    }

    if (orientation != Qt::Horizontal || role != Qt::DisplayRole)
        return QAbstractItemModel::headerData(section, orientation, role);

    QString returnValue;
    switch (section) {
    case 0: returnValue = tr("Name");
            break;
    case 1: returnValue = tr("Size");
            break;
    case 2: returnValue =
#ifdef Q_OS_MAC
                   tr("Kind", "Match OS X Finder");
#else
                   tr("Type", "All other platforms");
#endif
           break;
    // Windows   - Type
    // OS X      - Kind
    // Konqueror - File Type
    // Nautilus  - Type
    case 3: returnValue = tr("Date Modified");
            break;
    default: return QVariant();
    }
    return returnValue;
}

But it has tr() method on these items, so it should be already translated.
When program compiled using Qt shared libs, I can call this:

QString appPath = QApplication::applicationDirPath();
qtTranslator->load(QString("%1/translations/qt_uk.qm").arg(appPath));

to load the default Qt translations and it works well. The question is how to call/trigger it from the app which compiled statically?

[mrdebug]

Hi, I think the problem is only to use the right path in the .pro and Resources.qrc file. Please have a look:

.pro file

RESOURCES += \
    Resources.qrc

main.cpp

    QTranslator translator, translator2;
    if (translator.load("QtComPort_"+ QLocale::system().name(), ":/Translations")) a.installTranslator(&translator);
    if (translator2.load("qt_"+ QLocale::system().name(), ":/Translations")) a.installTranslator(&translator2);

Resource.qrc

<RCC>
    <qresource prefix="/Translations">
        <file>QtComPort_it.qm</file>
        <file>qt_it.qm</file>
    </qresource>
</RCC>

github
https://github.com/denisgottardello/QtComPort

[Cobra91151]

@mrdebug

Hello!

This only works when compiling the program with Qt shared libs. Using static build I do not have any default Qt translation (qt_*) files. The Qt installation dir contains the translations files but all of them are 1 KB.

[Cobra91151]

Ok. I have fixed the issue by inheriting the QFileSystemModel and overriding the headerData method. Now, it works as expected:

The issue is resolved. Thank you.

[Cobra91151]

Hello!

I have found out that even when I inherit QFileSystemModel and override the headerData method, some of the data are still not translated. So, my new solution is the following.

1. Compile the program as shared build.
2. Get the required default Qt translation (qt_*) files.
3. Store them to the resource file
4. Load them together with my translations.

Now, it translates all data. This issue is solved.

[SimonSchroeder]

@Cobra91151 said in Embed qt translation into executable in static app:

Get the required default Qt translation (qt_*) files.

This seems like the proper solution.