From the QMenu documentation:
There are four kinds of action items: separators, actions that show a submenu, widgets, and actions that perform an action. Separators are inserted with addSeparator(), submenus with addMenu(), and all other items are considered action items.
This rings a bell: Widgets! You can add a widget to the menu? That means you are settled, you can do whatever you want.
What you need is a QWidgetAction object. It allows you to insert a custom widget as an action. Your titles will be custom widgets. If you only need a title, a QLabel
should suffice:
QMenu* myMenu = new QMenu(...);
QLabel* label = new QLabel(tr("<b>Title</b>"), this);
label->setAlignment(Qt::AlignCenter);
QWidgetAction* a = new QWidgetAction(myMenu);
a->setDefaultWidget(label);
See this related question for more sophisticated example code: Is there a way to add a Widget to a QMenu in QtCreator