menu_popuper.cpp


#include <nana/gui.hpp>
#include <nana/gui/widgets/button.hpp>
#include <nana/gui/widgets/menu.hpp>
#include <iostream> 

using namespace nana;

//class menu_popuper
//{
//      public:
//              //C++03
//      menu_popuper(menu&, mouse bttn= mouse::right_button);
//      menu_popuper(menu&, window owner, const nana::point& pos, mouse bttn=  mouse::right_button      );
//
//              //C++11
//      menu_popuper(menu&, mouse = mouse::right_button);
//      menu_popuper(menu&, window owner, const nana::point& pos, mouse bttn= mouse::right_button);
//
//      void operator()(const eventinfo&);
//              
//private:                      //Implemented-Specified private members
//              
//};

// Now let's use it. There is a button, it popups the menu when it is clicked.


void on_menu_item(nana::menu::item_proxy& ip)
{
        std::size_t index = ip.index(); //Get the index of the clicking item.
    std::cout << "Menu item index:  " << index << std::endl; 
}

int main()
{
        form fm;

                //We need a menu object
        menu mobj;
        mobj.append ( "Item 0", &on_menu_item);
        mobj.append_splitter();
        mobj.append ( ("Item 1"), &on_menu_item);

                //Now we need a button.
        button btn(fm, nana::rectangle(nana::point(10, 10), nana::size(100, 25)));
        btn.caption(("Popup Menu"));

        ;//Popup the menu when right clicking the button.
        btn.events().mouse_down(menu_popuper(mobj));

        ;//Or popuping the menu with a specified coordinate when any mouse button is clicked.
        ;//btn.make_event<events::click> ( menu_popuper( mobj, btn, nana::point(0, 26),
        ;//                                mouse::any_button );

        fm.show();
        exec();
}