QFontDatabase Class | Qt GUI 5.15.7
https://doc.qt.io/qt-5/qfontdatabase.htmlSee also addApplicationFont(), applicationFontFamilies(), and removeApplicationFont(). [static] QStringList QFontDatabase:: applicationFontFamilies (int id) Returns a list of font families for the given application font identified by id. This function was introduced in Qt 4.2. See also addApplicationFont() and addApplicationFontFromData().