QTabWidget tab context menu

Easy way, but possibly not precisely what you need:

1. Connect to the 'currentChanged' signal of your QTabWidget
2. In the slot which is connected to the signal, create a QMenu and populate it as needed
3. Finally, in the slot which is connected to the signal, call QMenu::exec( QCursor::pos() )

This will get a function called whenever the tab is changed (not necessarily clicked) and spawn a menu at the current mouse position.

Complicated way, which exactly does what you describe:

1. Call QObject::installEventFilter on your QTabWidget, so that all the events on your QTabWidget are redirected to your own object.
2. In your own object, reimplement QObject::customEvent and handle all QMouseEvent events.
3. Populate a QMenu as needed and call QMenu::exec at the position of the QMouseEvent you're handling.

create a QMenu:

m_menu = new QMenu;

add your actions to menu.

Create a slot to be called when context menu requested on tab bar:

connect(m_tabWidget->tabBar(), &QTabBar::tabBarClicked, this, &MyClass::on_contextMenuRequested);

In the slot, show the menu. Definition of slot:

void MyClass::on_contextMenuRequested(int tabIndex)
{
    m_menu->popup(QCursor::pos());
}

If you need index of current tab in another function, use following:

m_tabWidget->tabBar()->currentIndex()