Re: Gtk::Style usage help needed

[José Alburquerque <jaalburquerque cox net>]

On Thu, 2010-10-28 at 14:24 -0700, siagogam wrote:
> Hi all:
> 
> Reading documentation I think I've understood that if I want to define the
> style of a widget I have to inherit from the Gtk::Style class and overload
> the provided virtual functions. But this simple example code fails with the
> following errors:
> 
> (a.out:17921): Pango-CRITICAL **: pango_layout_get_pixel_extents: assertion
> `PANGO_IS_LAYOUT (layout)' failed
> 
> (a.out:17921): GLib-GObject-CRITICAL **: g_object_get_qdata: assertion
> `G_IS_OBJECT (object)' failed
> 
> (a.out:17921): GLib-GObject-CRITICAL **: g_object_get_qdata: assertion
> `G_IS_OBJECT (object)' failed
> Segmentation fault
> 
> Here is the code:
> 
> #include <gtkmm.h>
> 
> class mystyle : public Gtk::Style
> {
>   public:
>      mystyle() : Gtk::Style()
>      {
>      }
> 
>      ~mystyle()
>      {
>      }
> };
> 
> int main (int argc, char **argv)
> {
> 	Gtk::Main mainkit(argc, argv);
> 
> 	Gtk::Window window;
> 	Gtk::Label label("test");
> 	mystyle style;
> 
> 	label.set_style(Glib::RefPtr <Gtk::Style> (&style));
> 
> 	window.resize(400,100);
> 	window.add(label);
> 	window.show_all();
> 	mainkit.run(window);
> 
> 	return 0;
> }
> 
> What is the proper way of doing this?

Using Gtk::Style::create() is probably the best way to get a Gtk::Style.

> 
> Thanks

-- 
José