Re: [Gramps-devel] Problems with gtk 3 conversion

[John R. <jr...@ce...>]

On Jun 20, 2011, at 12:04 AM, Benny Malengier wrote:

> 
> 
> 2011/6/20 John Ralls <jr...@ce...>
> 
> On Jun 19, 2011, at 2:06 PM, Benny Malengier wrote:
> 
> > Nick, Gerald, or other Gtk experts,
> >
> > I have hit a wall in the Gtk 3 conversion, see http://www.gramps-project.org/bugs/view.php?id=5009
> >
> > Please have a look at the problem: There is no more GenericTreeModel, and my attempts of creating a pure python one have failed.
> > So we have 3 options:
> >
> > 1/I'm doing something wrong and it can work using Gtk.TreeModel, we just need to understand it better.
> > 2/We need to write a C module as Generictreemode, then use ctypes and GObject to inherit from it and use in Gramps
> > 3/we need to convert to Gtk.ListStore and Gtk.TreeStore
> >
> > Let's hope it is 1/!
> > The file treeviewgramps.py shows the problem. When run, it shows:
> >
> > (treeviewgramps.py:2871): Gtk-CRITICAL **: gtk_tree_model_get_n_columns: assertion `iface->get_n_columns != NULL' failed
> > (treeviewgramps.py:2871): Gtk-CRITICAL **: gtk_tree_model_get_iter: assertion `iface->get_iter != NULL' failed
> >
> > And the treeview holds no data.
> >
> > What I can say for now is that documentation is bad, no resources yet via the internet,  and segmentation faults galore.
> 
> 
> GenericTreeModel is an implementation of GtkTreeModel... GtkTreeStore is too. It looks like John Stowers has made some effort to make GenericTreeModel more python-like, but it doesn't look like he's extended GtkTreeModel. 1/ or 3/ should be feasible, but will require that you rewrite your code to use the GtkTreeModel functions directly.
> 
> Yes, rewriting to GtkTreeModel is what I did, but it is an abstract class not allowing direct inheritence. I need to figure out the correct way to do it. 
> 
> I now do: 
> 
> class FlatBaseModel(GObject.GObject, Gtk.TreeModel):
>     __gtype_name__ = 'FlatBaseModel'
> 
>     def __init__(self):
>         GObject.GObject.__init__(self)
> 
> Which already throws an assertion.
> I think the error is in the needed implementation of 
> 
> http://developer.gnome.org/gtk3/stable/GtkTreeModel.html#GtkTreeModelIface
> 
> I don't know if above init is sufficient to set this GInterface also...
> 
> 
> After browsing the code in pygtktreemodel.c for a bit, it looks to me that it should port to Gtk3 with minimal pain, so 2/ might be the least amount of work.
> 
> Yes, the only disadvantage is that we need to do some compiling in Gramps for install, raising the bar for a source install by users.
> However, as so many resources on the net exist for GtkGenericTreeModel, and so many applications seem to use it, I would hope they create some support to make porting easier.
> 
> I wrote a mail to John Stowers to ask if he has a git branch with port of his D-Feet application, as it uses GtkGenericTreeModel, if no reply, I'll subscribe to pygtk list and ask there. On IRC there was nobody with the knowledge to help. 
> All I need would be one example of how it is supposed to be set up :-)

Benny,

I'm not sufficiently familiar with pygi to know if you can implement a gtk interface directly in Python, or how to go about it. Are the Gtk-supplied implementations (GtkTreeStore, etc.) not adequate?

Did you see http://developer.gnome.org/gtk3/stable/TreeWidget.html ?

Regards,
John Ralls