Runtime locale changes do not propagate to existing dialogs and widgets

[Pete Klemm]

I have a desktop application in which I support several languages. I have a comboBox with all supported languages and those change correctly as they call ui->retranslate().

My problem is I also need to change the locale of all child widgets so the display and entry of numeric data uses the correct decimal separator.

I set the now locale in QMainWindow but I have been unable to get that new locale to propagate down to all existing child widgets.

Here is how I modify the locale in QMainWindow:

    QLocale locale = QLocale(selectedLanguage);
    locale.setNumberOptions(QLocale::OmitGroupSeparator);
    QLocale::setDefault(locale);
    setLocale(locale);

However none of QMainWindow's child widgets have the new locale.

The documentation states that locale changes propagate down to children.

I must be missing something here, or I have done something that blocks the propagation.

A search has not provided any good examples.