By subclassing GenericTreeModel and implementing the "on_*" methods (e.g. on_get_iter(path) ) of GenericTreeModel. A simple example, treemodel.py, implementing all the required methods of the TreeModel, is included in the pygtk distribution in the examples/pygtk-demos/demos directory: [git.gnome.org]

Some other examples making use of GenericTreeModel:

• Michele Campeot's filesystem viewer: [www.micampe.it]

• NamespaceModel from Arjan Molena's gaphor (in gaphor/ui/namespace.py): [gaphor.sourceforge.net]

• The GTK TreeModel is very similar to the TreeModel class from Java Swing: [java.sun.com]