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List:       gtkmm
Subject:    Re: [gtkmm] Connecting signals with libglade and gtkmm
From:       Ben Liblit <liblit () eecs ! berkeley ! edu>
Date:       2001-08-25 19:34:56
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Loban Amaan Rahman suggested:
> 
> I think you also need to convert the Gtk+ widget into a Gtk-- widget.
> So ...
> 
> Gtk::Button* quitbutton;
> quitbutton = static_cast<Gtk::Button*>(Gtk::wrap(glade_xml_widget(xml,
> "quitbutton");

I'd suggest two stylistic changes to this.  First, Gtk::wrap() is
overloaded, and if you cast *before* calling it rather than after, the
wrapped object it produces will already have the proper type.  Second,
static_cast<>() does no checking; I would use GTK+ casting macros
instead, because they will give back informative error messages if
somebody tweaked your glade file so that "quitbutton" is not actually a
button.

So putting those together, we get:

   Gtk::Button *quitbutton =
      Gtk::wrap(GTK_BUTTON(glade_xml_widget(xml, "quitbutton");

The overloaded Gtk::wrap() functions are really nifty here.  Because
GTK_BUTTON yields a GtkButton *, the selected Gtk::wrap() function is
the one that turns a GtkButton * into a Gtk::Button *, which is exactly
what you want.

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