Dialog standardButtons localization

Cattivik

Hi!
I'm using Qt 6.8 to develop a QtQuick application running on Win11 x64. I'm on QtCreator 17.

I would like to use dynamic translation for my app. I have some *.qm files deployed to a directory, and I can install QTranslators on the fly.
That part works fine.

The issues is related to QML Dialog standardButtons: I can install qtbase_xx.qm translator but it seams to work only the first time!
Removing old translator and installing a new one doesn't work for me.

It seams that Dialog standardButtons texts are "cached" in some way, and calling engine.retranslate() has no effect on them.

I know, I would provide translations for them, or use custom button footer on dialogs, and so on.... But I'm trying to figure out if I missed something.
Any suggestion?

Thanks in advance
-C

Bandler

We load the control translations like this on language changes:

    QTranslator qtTranslator;
    if (qtTranslator.load(QLocale(language),
                          "qtquickcontrols",
                          "_",
                          QLibraryInfo::path(QLibraryInfo::TranslationsPath))) {
        QCoreApplication::installTranslator(&qtTranslator);

        engine->retranslate();
    }

Cattivik

Thanks @Bandler for your reply.

I started a test application from this example: https://doc.qt.io/qt-6/qtlinguist-localizedclock-example.html.
I'm doing the same to load myApp_xx.qm and then the other translator: I think that button texts are translated in qtbase_xx.qm file (qtquickcontrols was changed into qtdeclarative according to this, but it does not contain what I need).

In my application I have a button to open a standard message dialog like this:

MessageDialog {
    title: qsTr("This is a standard message dialog")
    text: qsTr("The document has been modified.")
    informativeText: qsTr("Do you want to save your changes?")
    buttons: MessageDialog.Yes | MessageDialog.No
}

and a dropdown to change language and locale dynamically.

Something strange happens in two cases.

Case #1

run application (default language is english)
open the message (button texts are Yes and No)
every attempt to change language fails for message buttons: all other application texts are correctly translated but message button texts remain in english.

Case #2

run application (english default)
change language to japanese (for example)
open the message, and yes, now button text are in japanese!
BUT every attempt to change language again fails from now on: message button texts still remain in japanese while all other texts in the app are correctly translated.

For that reason I can imagine that MessageDialog component doesn't support dynamic translation, maybe.

Hope this helps.
-C