I've been trying to develop my own list model for a gtk.TreeView. The ListStore's performance is significantly slower that I can accept (I have thousands of entries, and it can take longer than a minute to load). I've been able to create my own class derived from gtk.GenericTreeModel, and it has proved to be at least an order of magnitude faster. The problem I am encountering is that I cannot figure out how to add column sorting. All the examples I've been able to find are static (data is never added or deleted) and non-sortable
If I make a column sortable on the TreeView (column.set_sort_column_id(0)), and it is clicked, I get the error:
(model.py:16538): Gtk-CRITICAL **: file gtktreesortable.c: line 107 (gtk_tree_sortable_get_sort_column_id): assertion `GTK_IS_TREE_SORTABLE (sortable)' failed
The class, derived from GenericTreeModel, does not have the set_sort_column_id() method that the TreeStore and ListStore classes have. This method is a member of the TreeSortable class, which GenericTreeModel is not derived from
I've tried to make my class inherit from the gtk.TreeSortable class (similar to the TreeStore class):
class MyTreeModel(gtk.GenericTreeModel, gtk.TreeSortable):
And I get the error:
Traceback (most recent call last): File "model.py", line 6, in ? class MyTreeModel(gtk.GenericTreeModel,gtk.TreeSortable): TypeError: multiple bases have instance lay-out conflict
I think I am missing something pretty basic here. Does anyone know what I am doing wrong?
Thanks, Don Allingham
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