Re: Gtk2 and inheritance

[Guillaume Cottenceau <gc mandrakesoft com>]

Jörn Reder <joern zyn de> writes:

> Jörn Reder wrote:
>
> > With Gtk this works. Gtk2 stores the objects internally as scalar refs 
> > (I suppose it's is the corresponding C pointer), while Gtk uses hash 
> > refs, which could be reblessed without problems
>
> Ok - I crawled the source again and now I know a little more.
>
> The "modification of a read-only value" thing is easy to fix. We just 
> have to remove
>
>   SvREADONLY_on(obj);
>
> from _Helpers.c, unless it's not just for safeness. I checked this with
> "make test" - it runs without problems, so removing it should be Ok.

Goran was the decider for that. I'll let him answer on it.

To my eyes, it seems that it's for safeness because there is no
known necessity for re-blessing gtk2 objects from perl code.
 
> > (also it was easy to 
> > attach user data to arbitrary widget objects - but that's not that 
> > important here... ;)
>
> But here I was mistaken (probably I should get more sleep ;). In fact 
> inheritance without the ability of attaching additional attributes to an
> object, is useless.

Use `$object->set_data' and `$object->get_data'.

So we agree, re-blessing gtk2 objects from perl code is useless :).


-- 
Guillaume Cottenceau - http://people.mandrakesoft.com/~gc/