Re: tree model

[Claudio Saavedra <csaavedra gnome org>]

On Tue, 2009-05-12 at 12:50 +0200, Alexander Larsson wrote:
> On Tue, 2009-05-12 at 10:47 +0200, Christian Dywan wrote:
> > Am Tue, 12 May 2009 08:10:11 +0200
> > schrieb Mikkel Kamstrup Erlandsen <mikkel kamstrup gmail com>:
> > 
> > > 2009/5/12 Matthias Clasen <matthias clasen gmail com>:
> > > >>
> > > >> I should have been slightly more clear:  I am interested in being
> > > >> able to provide a GtkTreeModel for those people who wish to use it
> > > >> without having to link to libgtk myself.
> > > >>
> > > >> So the problem with using GNode: GtkTreeView doesn't use it.
> > > >
> > > > I don't see why this is something we should be eager to support.
> > > > Since tree models are only useful with GTK+ widgets, it doesn't
> > > > seem like a big burden to link against gtk when you are providing
> > > > tree models. The consumer of your model will already link against
> > > > gtk anyway.
> > > 
> > > I recall having issues with this... But my memory serves me badly...
> > > 
> > > Is it that gtk_init() requires a connection to X? That way if I am
> > > writing mydaemon based on mylib.so then mydaemon will require X to
> > > run. Maybe gtk_init_check() can work around this, or maybe the library
> > > does not need gtk_init_* in the first place... I  am hoping that I can
> > > use the same data model in the daemon and in the GUI app so that I
> > > don't have to wrap it in a GtkTreeModel when using it in the GUI app.
> > > 
> > > Anyway, I just want to back Ryan up on this one. I've been wanting a
> > > GTreeModel for the exact same purpose as Ryan on more than one
> > > occasion.
> > 
> > Hey,
> > 
> > if the main issue is, as you describe, not having to run X11, then
> > gtk_init_check is all you need. There is no practical problem using a
> > GtkTreeModel without a display. It's simply that gtk_init errors out if
> > there is no display, which is reasonable default behaviour. See the API
> > reference for details :)
> 
> The issue comes up when you have an object in a non-gui library that you
> would like to use as a source for a GtkTreeView, for instance, in ryans
> case I believe its about some object that would end up in libgio.
> 

totem-pl-parser is using GtkTreeModel as well. IIRC, tracker uses
totem-pl-parser to parse playlists, but I guess they are not interested
on GtkTreeView.

Claudio