Re: [Vala] Access the "klass" parameter of a class_init() function in vala with "static construct"

[Evan Nemerson <evan coeus-group com>]

On Sat, 2010-07-31 at 17:59 +0200, Sébastien Wilmet wrote:
> Hello!
>
> What I want to do is to implement a GtkAction derived class which sets
> GtkActionClass:toolbar_item_type to GTK_TYPE_MENU_TOOL_BUTTON in its
> class_init function.

Vala doesn't currently expose *Class structs in the bindings, so AFAIK
what you're talking about can't be done easily. I'm not exactly an
expert on GObject, but I think you should be able to hack something
together by going creating bindings for GtkActionClass then getting
access to it with GLib.Object.get_class. This is untested, but you
should get the idea:


/* In a vapi */
[Compact, CCode (cname = "GtkActionClass")]
public class GtkActionClass {
  public GLib.Type menu_item_type;
  public GLib.Type toolbar_item_type;
}

/* Your code */
unowned GtkActionClass ac = (GtkActionClass) this.get_class ();
ac.toolbar_item_type = typeof (MenuToolButton);


This type of thing seems to be pretty uncommon... the only other example
I'm aware of is GtkAction (see bug #611498) so I'm not sure if support
for this should be added to Vala or not. If so, I'm thinking the syntax
could just be "public virtual GLib.Type toolbar_item_type;" (currently
emits an error about virtual not working with fields), which means we
still don't need to expose the whole *Class struct in the bindings.
Jürg, what do you think?


-Evan