Question

I need to put a QPushButton inside a QMenu. Is it possible and, if so, then how?

I want to achieve something like this:

Answer 1

QWidgetAction is what you are looking for. This is what is on qt docs

The QWidgetAction class extends QAction by an interface for inserting custom widgets into action based containers

So basically it gives a custom UI to QAction according to what QWidget you pass to it.
I have used QWidgetAction to show checkbox as QMenu items.

QCheckBox *chkBox = new QCheckBox(menu);
chkBox ->setText("MyCheckBox");
QWidgetAction *chkBoxAction= new QWidgetAction(menu);
chkBoxAction->setDefaultWidget(chkBox);
menu->addAction(chkBoxAction);

You can then handle signals from checkbox accordingly.