gtkmm:如何在没有builder的情况下创建弹出菜单？

#include <gtkmm.h>

Gtk::Menu menu;

Gtk::MenuItem menu_item("菜单项");
menu.append(menu_item);

menu_item.signal_activate().connect(sigc::mem_fun(*this, &YourClass::on_menu_item_clicked));

Gtk::EventBox event_box;
event_box.add(menu);

event_box.signal_button_press_event().connect(sigc::mem_fun(*this, &YourClass::on_event_box_button_press));

your_container.add(event_box);

void YourClass::on_menu_item_clicked() {
    // 处理菜单项点击事件的逻辑
}

bool YourClass::on_event_box_button_press(GdkEventButton* event) {
    if (event->button == GDK_BUTTON_SECONDARY) {
        menu.popup(event->button, event->time);
        return true;
    }
    return false;
}