Re: [gtkmm] Custom TreeStore Problems

[Thomas Muldowney <temas box5 net>]

I've recently battled through this myself and have defeated it!  That's
to say I got something working.  I'm not sure if it's 100% correct, but
it seems to be working great.  The code is available in the Gabber2 CVS,
you can use viewcvs.cgi here:

http://www.jabberstudio.org/cgi-bin/viewcvs.cgi/gabber/src/

RosterModel.cc and .hh have the actual model implementation, and it's
used as the model for the treeview contained in RosterView.

I'd be more than happy to answer questions about what I did, or receive
any feedback about more correct ways to do things.  Especially related
to the RosterModel_Class (Glib::Class).  I'd also be willing to write up
a small tutorial with more simple code and implementation if the code
I've written is deemed mostly correct =)

--temas


On Mon, 2003-04-28 at 20:45, darco wrote:
> I am trying to implement a Custom TreeStore using GtkMM. Unable to
> find any documentation on how to do this, I figured I would just give
> it a shot and see if I could figure it out. But I have now come to a
> point where I am stumped. I'm not sure if I'm just missing something,
> or if it is a bug.
> 
> 
> Seeing as there is no example for creating a custom tree store in the
> GtkMM tarball, I wrote a small program that (if it worked) would
> demonstrate how to do this. After if is fixed and working, it might be
> helpful if it were included into the tarball (or perhaps elsewhere)
> for others to examine.
> 
> 
> Right now, I'm getting the following runtime errors:
> 
> 
> <fixed><fontfamily><param>Courier New</param><bigger>(customtreestore:343):
> glibmm-CRITICAL **: file interface.cc: line 53
> (Glib::Interface::Interface(const Glib::Interface_Class&)): assertion
> `gobject_ != 0' failed
> 
> 
> (customtreestore:343): glibmm-CRITICAL **: file interface.cc: line 53
> (Glib::Interface::Interface(const Glib::Interface_Class&)): assertion
> `gobject_ != 0' failed
> 
> 
> (customtreestore:343): glibmm-CRITICAL **: file interface.cc: line 53
> (Glib::Interface::Interface(const Glib::Interface_Class&)): assertion
> `gobject_ != 0' failed
> 
> 
> (customtreestore:343): glibmm-CRITICAL **: file interface.cc: line 53
> (Glib::Interface::Interface(const Glib::Interface_Class&)): assertion
> `gobject_ != 0' failed
> 
> 
> (customtreestore:343): GLib-GObject-CRITICAL **: file gobject.c: line
> 1319 (g_object_ref): assertion `G_IS_OBJECT (object)' failed
> 
> 
> (customtreestore:343): GLib-GObject-CRITICAL **: file gobject.c: line
> 1337 (g_object_unref): assertion `G_IS_OBJECT (object)' failed
> 
> 
> (customtreestore:343): GLib-GObject-CRITICAL **: file gobject.c: line
> 1337 (g_object_unref): assertion `G_IS_OBJECT (object)' failed
> 
> </bigger></fontfamily></fixed>
> 
> Oddly enough, several of these errors appear when I am copying the
> Glib::RefPtr<<> for the CustomTreeStore! I find this to be most
> bizzare. NONE of the virtual functions are being called, and I don't
> know why. Is it possible that I'm not using the Glib::RefPtr<<>
> correctly?
> 
> 
> I saw that someone earlier mentioned having similar problems and
> Murray suggested the following:
> 
> <excerpt>I suspect that a custom Store might require similar
> techniques as a custom CellRenderer, because it might require the
> definition of a new GObject type at runtime. You should probably look
> at the constructors in the custom cellrenderer example.
> 
> </excerpt>
> 
> I just wanted to say that I am doing this, and the program still
> yields the results shown above.
> 
> 
> The source code to this example can be found here:
> 
> ftp://ftp.voria.net/pub/customtreestore.tar.gz (Or if you prefer http,
> use http://ftp.voria.net/pub/customtreestore.tar.gz )
> 
> 
> Thanks in advance!
> 
> 
> --- darco
> 
> http://www.deepdarc.com/