How to activate GtkNotebook page on middle click?

Platform
,
2

Found how to assign all buttons by create new event controller, but still don’t understand how to activate the Notebook tab on click

// GtkNotebook Label widget
const auto controller = Gtk::GestureClick::create();

controller->set_button(
    0 // all
);

add_controller(
    controller
);

controller->signal_pressed().connect(
    [this](int n, double x, double y)
    {
        activate(); // not works
    }
);

upd. seems the answer is here:

thanks to

upd2.

this *code still does not work, lol

// Gtk::Notebook

const auto controller = Gtk::GestureClick::create();

controller->set_button(
    GDK_BUTTON_MIDDLE
);

add_controller(
    controller
);

controller->signal_pressed().connect(
    [this](int n, double x, double y)
    {
        auto widget = pick(x, y);

        if (NULL != widget)
        {
            auto i = page_num(*widget);

            if (i >= 0) // -1, fails as not found
            {
                set_current_page(i);
            }
        }
    }
);