Hi Andi,
It looks like the problems you are seeing have been fixed in later versions
of pygobject. Please try 3.4 or later. I observe the following failing with
3.2 but working in head:
class Model(GObject.Object, Gtk.TreeModel):
def do_get_iter(self, path):
it = Gtk.TreeIter()
it.user_data = 23
return (True, it)
def do_get_value(self, it, column):
return it.user_data
m = Model()
it = m.get_iter_first()
it.user_data # None in pygobject 3.2 and "23" in head
m.get_value(it, 0) # Same as above
-Simon
On Mon, Dec 31, 2012 at 6:10 AM, Andi Albrecht <[email protected]>wrote:
> Hi all,
>
> I know that this topic came up a few times, but I couldn't find a
> working solution across the net yet. Maybe someone here on the list
> could point me in the right direction...
>
> I'm about to port a GTK2 application to GTK3. Within this application
> I've got a simple GenericTreeModel that causes me headaches when I try
> to port it.
>
> To understand things better, I've wrote a stripped down version.
> Here's the GenericTreeModel variant, that takes in a simple list of
> values:
>
> import gtk, gobject
>
> class TreeModel(gtk.GenericTreeModel):
>
> def __init__(self, data):
> self.data = data
> super(TreeModel, self).__init__()
>
> def on_get_n_columns(self):
> return 1
>
> def on_get_column_type(self, idx):
> return gobject.TYPE_PYOBJECT
>
> def on_get_iter(self, path):
> if path[0] < len(self.data):
> return path[0]
> else:
> return None
>
> def on_iter_next(self, iter_):
> if iter_ < len(self.data) - 1:
> return iter_ + 1
> else:
> return None
>
> def on_get_value(self, iter_, column):
> return self.data[iter_]
>
>
> if __name__ == '__main__':
> t = TreeModel(['foo', 'bar', 'baz'])
> iter_ = t.get_iter_first()
> while iter_:
> print(t.get_value(iter_, 0))
> iter_ = t.iter_next(iter_)
>
> This code works as expected and outputs "foo", "bar", "baz". As you
> can see, I'm using simple list indices as iter.
>
> My first attempt in porting it to TreeModel looks like this:
>
> from gi.repository import Gtk, GObject
>
> class TreeModel(GObject.GObject, Gtk.TreeModel):
>
> def __init__(self, data):
> self.data = data
> super(TreeModel, self).__init__()
>
> def do_get_n_columns(self):
> return 1
>
> def do_get_column_type(self, idx):
> return GObject.TYPE_PYOBJECT
>
> def do_get_iter(self, path):
> ### path is now TreePath ###
> p = path.get_indices()
> if p[0] < len(self.data):
> return p[0]
> else:
> return None
>
> def do_iter_next(self, iter_):
> if iter_ < len(self.data) - 1:
> return iter_ + 1
> else:
> return None
>
> def do_get_value(self, iter_, column):
> return self.data[iter_]
>
> When running the same main function as above, the following error is
> raised (on Debian testing):
>
>
> ERROR:/home/martin/debian/pkg-gnome/build-area/pygobject-3.2.2/gi/pygi-closure.c:317:_pygi_closure_set_out_arguments:
> code should not be reached
>
> Somewhere I've found that do_get_iter() should return a 2-tuple, when
> changing the above code to
>
> def do_get_iter(self, path):
> # path is now TreePath
> p = path.get_indices()
> if p[0] < len(self.data):
> return (True, p[0])
> else:
> return (False, None)
>
> the following traceback is raised:
>
> Traceback (most recent call last):
> File "treemodelgi2.py", line 34, in do_get_value
> return self.data[iter_]
> TypeError: list indices must be integers, not TreeIter
>
> Somewhere the 2-tuple returned by do_get_iter() is casted to a
> TreeIter. But where is the list index (here p[0]) I've returned as my
> iter? TreeIter.user_data is None in do_get_value(). Even when I return
> a TreeIter directly in do_get_iter() with TreeIter.user_data set to
> p[0] the information in user_data is lost when do_get_value() is
> called since do_get_value() receives a different instance of TreeIter
> then.
>
> Can anybod give me a hint on how to correctly port this simple custom
> TreeModel? I'm kind of stuck now...
>
> Best regards,
>
> Andi
> _______________________________________________
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> http://www.daa.com.au/mailman/listinfo/pygtk
> Read the PyGTK FAQ: http://faq.pygtk.org/
>
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