Re: custom widget

[Mark Richardson <markmapo yahoo com>]

Thanks for the input - it helped!

I changed the calls from _gtk* functions to my own versions.  Seems kinda silly to re-implement marshalling functions - is there a standard set of these available to all, or do custom widgets have to just implent their own.

 

your suggestion about linking to multiple copies Gtk+ also helped - I had linked in gtkmarshalers.o to get around the the above problem.  Consider my hand smacked for reaching into the cookie jar.

 

Thank you again.

Mark 

Owen Taylor <otaylor redhat com> wrote:

> On Tue, 2006-09-26 at 19:08 -0700, Mark Richardson wrote:
> > Sorry about posting in the gtk dev area, but this is borderline app
> > dev/gtk dev.
> > 
> > Anyway, I'm making a custom widget,
>  and when I try to create a
> > signal...
> > signals[MOVE_CURSOR]=g_signal_new("move_cursor",
> > G_OBJECT_CLASS_TYPE(gobject_class), G_SIGNAL_RUN_LAS |
> > G_SIGNAL_ACTION, G_STRUCT_OFFSET (GtkLabel2Class, move_cursor), NULL,
> > NULL, _gtk_marshal_VOID__ENUM_INT_BOOLEAN, G_TYPE_NONE, 3,
> > GTK_TYPE_MOVEMENT_STEP, G_TYPE_INT, G_TYPE_BOOLEAN)
> > 
> > I get the message..
> > (CustomWidget:3960): Glib-GObject-WARNING **: cannot register existing
> > type 'GtkMovementStep'
> > 
> > so digging into the source, I find out that if I make a call to
> > gtk_movement_step_get_type(), I will get this warning every time.
> > 
> > I found the code in gtktypebuiltins.c for
> > gtk_movement_step_get_type(), and it seems that the etype is always 0.
> > So it keeps trying 
> > g_enum_register_static (g_intern_static_string("GtkMovementStep"),
> > values)
> >
> > Which generates the message.
>
> Likely
>  cause is linking to multiple copies of GLib or GTK+.
>
> > I'm having lots of problems porting my old custom widgets (from gtk
> > 2.8 - maybe 2.4 - don't really remember) to gtk 2.10 because of all of
> > the private functions (performing an nm on the library shows that the
> > function is local and not global). I also can't find any good custom
> > widget examples that are friendly with 2.10 (except for the gtkdial in
> > the examples). If anyone can help me with this, I would gladly post
> > my 4 custom widgets up for examples for others (once I get them
> > working). I tried taking the gtklabel widget and renaming it and all
> > the functions to gtklabel2 - so as to simulate a correctly written
> > widget for 2.10. I get so many errors with this, so I must not be
> > doing something right.
>
> Most of the more complicated widgets inside of GTK+ are not compilable
> outside of GTK+, because they use internal GTK+ only
>  API. That doesn't
> mean that you can't write sophisticated, full-featured custom widgets
> using the public API of GTK+. But we don't want to make eternal
> compatibility guarantees for every convenience function, or experimental
> API.
>
> And certainly not generated marshalers like 
> _gtk_marshal_VOID__ENUM_INT_BOOLEAN - you are supposed to run 
> glib-genmarshal yourself with you own namespace prefix.
>
> We haven't removed anything from the public GTK+ since at least 2.0.0.
> With early versions of GTK+-2.x you may have been able to access
> symbols starting with _gtk_ when linking against GTK+, but it was
> made clear that those functions were not part of the GTK+ API.
>
> - Owen
>
>
> _______________________________________________
> gtk-devel-list mailing list
> gtk-devel-list gnome org
> http://mail.gnome.org/mailman/listinfo/gtk-devel-list

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