Re-Translating QStringLists

Perdrix

In my code I have some string lists like e.g.:

QStringList OUTPUTLIST_FILTERS({
	QCoreApplication::translate("StackingDlg", "File List (*.dssfilelist)", "IDS_LISTFILTER_OUTPUT"),
	QCoreApplication::translate("StackingDlg", "File List (*.txt)", "IDS_LISTFILTER_OUTPUT"),
	QCoreApplication::translate("StackingDlg", "All Files (*)", "IDS_LISTFILTER_OUTPUT")
	});

which are not currently members of the StackingDlg class, and when the user changes to a different language they need to be updated.

I have:

void StackingDlg::changeEvent(QEvent* event)
{
	if (event->type() == QEvent::LanguageChange)
	{
		ui->retranslateUi(this);
	}
	Inherited::changeEvent(event);
}

How should I change that to update those string lists?

Thanks
David

Paul Colby

Hi @Perdrix,

As QCoreApplication::translate() is a static function, those strings will not automatically re-translate, so you'll need to trigger re-translate yourself. Perhaps something like:

const QStringList OUTPUTLIST_FILTER_SOURCES({
	QStringLiteral("File List (*.dssfilelist)"),
	QStringLiteral("File List (*.txt)"),
	QStringLiteral("All Files (*)")
	});

QStringList OUTPUTLIST_FILTERS{};

// call this somewhere early to initialise.
void translateFilterStrings() {
    OUTPUTLIST_FILTERS.clear();
    for (const QString &filter: OUTPUTLIST_FILTER_SOURCES) {
        OUTPUTLIST_FILTERS.append(QCoreApplication::translate("StackingDlg", filter, "IDS_LISTFILTER_OUTPUT");
    }
    Q_ASSERT(OUTPUTLIST_FILTERS.size() == OUTPUTLIST_FILTER_SOURCES.size());
}

void StackingDlg::changeEvent(QEvent* event)
{
        translateFilterStrings();
        ...
	Inherited::changeEvent(event);
}

Of course, once you're managing those translations within your StackingDlg, you might as well use StackingDlg::tr() instead of QCoreApplication::translate() too.

Cheers.

Perdrix

Nice!

Needed one small change:

OUTPUTLIST_FILTERS.append(tr(filter.toLocal8Bit(), "IDS_LISTFILTER_OUTPUT"));

Thanks, D.