QTabWidget tab context menu

Question

I need to display a context menu whenever a tab is clicked on and it needs to react to that specific tab. Is there any way to do this without subclassing it?

Answer 1

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.

Answer 2

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()

Answer 3

As per the comment by @Petrzio Berkerle, the solution found at https://www.qtcentre.org/threads/16703-QTabBar-Context-menu-on-tab?p=84057#post84057 worked very well for me. (Actually, it was the only one that worked at all.)

The code from the post there (by "spirit"):

    ...
    m_tabBar = new QTabBar();
    m_tabBar->addTab(tr("OK"));
    m_tabBar->addTab(tr("NO"));
    m_tabBar->addTab(tr("IGNORE"));
    m_tabBar->setContextMenuPolicy(Qt::CustomContextMenu);
     
    connect(m_tabBar, SIGNAL(customContextMenuRequested(const QPoint &)), SLOT(showContextMenu(const QPoint &)));
    ...
     
    void Test::showContextMenu(const QPoint &point)
    {
        if (point.isNull())
            return;
     
        int tabIndex = m_tabBar->tabAt(point);
        QMenu menu(this);
        if (!tabIndex)
            menu.addAction(tr("OK"));
        else if (tabIndex == 1)
            menu.addAction(tr("NO"));
        else if (tabIndex == 2)
            menu.addAction(tr("IGNORE"));
     
        menu.exec(m_tabBar->mapToGlobal(point));
    }