Re: FW: Popup menu selections

[Bob Caryl <bob fis-cal com>]

Bob Huston wrote:

> Thanks to everyone for the help.  Feeling a bit stupid here, but...
>
> it works, using the SigC::bind mentioned below it is now working. The issue
> I had with it being a null when it got into my callback, I believe was the
> complier optimizing the variable away since I wasn't using it.
>
> I added two lines to the method:
>
> Glib::ustring str2;
> str2=str;
>
> and it worked. Not sure why the compiler optimized it out, but in any case
> it is now working and I am off and running.
>
> Thanks!
>
>
> -----Original Message-----
> From: Bob Caryl [mailto:bob fis-cal com] 
> Sent: Wednesday, June 01, 2005 11:01 AM
> To: Bob Huston
> Cc: gtkmm-list gnome org
> Subject: Re: FW: Popup menu selections
>
> Bob Huston wrote:
>
>  
>
> > thanks for the pointer, it helped a bit, and pointed me at some other
> > options
> > as well. Unfortunately, I can't get any to work.
> >
> > I modified my menu build to be:
> >
> > pSubMenu->items().push_back(Gtk::Menu_Helpers::MenuElem::MenuElem("foo menu
> > option",
> >                     SigC::bind<glib::ustring>(SigC::slot(*this,
> > &CMyTreeView::on_popup), "foo"))); 
> >
> > and changed the call back to:
> >
> > void CMyTreeView::on_popup(Glib::ustring str) 
> > { 
> >    //do whatever is needed. 
> > } 
> >  
> > rebuild and run, setting a break point in on_popup. The break is hit,
> > however, the
> > passed parameter str is null.
> >
> >
> >    
> typedef SigC::Slot0<void> Gtk::Menu_Helpers::Element::CallSlot
>
> The problem I see with the above code is that the 
> Gtk::Menu_Helpers::MenuElem::MenuElem function is prototyped this way:
>   
>    MenuElem (const Glib::ustring& label, const CallSlot& slot=CallSlot())
>
> and CallSlot is prototyped this way:
>
>    typedef SigC::Slot0<void> Gtk::Menu_Helpers::Element::CallSlot
>
> Note the SigC::Slot0 template shows only a return value for the slot...  
> NO formal paramters are expected and so, even though you are attempting 
> to bind a Glib::ustring so that you can identify which menu item is 
> being processed by a single callback slot, the parameter for your 
> callback slot is always null.  I realize it's feckless to only tell you 
> why what you're trying doesn't work and I'm sorry for that.  What you're 
> trying will probably only work with the "connect" method associated with 
> class signal methods such as "Gtk::Button::signal_clicked".
>
> Bob Caryl
>
>
>
>
>
>
>
>  
<Bob cleans the egg off his face>  Oops!

Bob