In Qt 4.7, how can a pop-up menu be added to a QToolbar button?

Question

I am newbie to Qt and am currently playing about with Qt Creator and raw C++ code. I have managed to get some simple functionality working, including a menu and toolbar by a

Answer 1

serge_gubenco's answer will work, except when the window needs to be resized smaller and Qt tries to put the QToolButton itself in a popup menu. It may be unable do so. See http://doc.qt.io/archives/qt-4.7/qtoolbar.html.

The solution is to use a quick QWidgetAction, as below in a modified snippet.

QMenu *menu = new QMenu();
QAction *testAction = new QAction("test menu item", this);
menu->addAction(testAction);

QToolButton* toolButton = new QToolButton();
toolButton->setMenu(menu);
toolButton->setPopupMode(QToolButton::InstantPopup);

QWidgetAction* toolButtonAction = new QWidgetAction(this);
toolButtonAction->setDefaultWidget(toolButton);

toolBar->addAction(toolButtonAction);