[pygtk] Re: Indexing ListStore with iterators

[Brad Schick]

Anyone have any ideas on this? If not I may try to get debug builds of
gtk+ and pygtk going to look for the issue.

Perhaps this is a gtk+ problem. Anyone know if the gtk+ mailing lists
accept problem reports writing with pygtk? I'm guess not...

-Brad


On 7/18/07, Brad Schick <schickb at gmail.com> wrote:
> > While writing a custom sort function for a gtk.ListStore, I found that
> > using the provided iterator to access the model doesn't work
> > correctly....
>
> I hope I'm not missing some stupid error in my code, but this looks
> like a bug. In the example below, if you comment out or remove the
> first print statement in "sort_func", everything works as expected.
> But if you leave in the print statement and click the first column in
> the treeview, the sort gets stuck in a loop due to what looks like
> corrupted iterators.
>
> It looks like model.get_path is corrupting the iterators.
> model.get_string_from_iter does the same thing. I've tried this on
> both linux and windows under pygtk 2.10.4 with gtk 2.10.11 and python
> 2.5.1.
>
> -------------------------------------------------------
> #!/usr/bin/env python
> import pygtk
> pygtk.require('2.0')
> import gtk
>
> def sort_func( model, iter1, iter2 ):
>     # When the next line is left in place, the iterators are corrupted
>     print model.get_path(iter1), model.get_path(iter2)
>
>     print model.get_value(iter1, 0), model.get_value(iter2, 0)
>     result = model.get_value(iter1, 0) - model.get_value(iter2, 0)
>     return min( max(result, -1), 1 ) #  keep results in range
>
>
> model = gtk.ListStore( int, int )
> model.set_sort_func( 1000, sort_func )
>
> tree = gtk.TreeView( model )
> tree.set_reorderable( False )
>
> render = gtk.CellRendererText()
> col0 = gtk.TreeViewColumn( 'col0', render )
> col0.add_attribute( render, "text", 0 )
> col0.set_sort_column_id(1000)
>
> render = gtk.CellRendererText()
> col1 = gtk.TreeViewColumn( 'col1', render )
> col1.add_attribute( render, "text", 1 )
> col1.set_sort_column_id(1)
>
> tree.append_column( col0 )
> tree.append_column( col1 )
> tree.set_headers_clickable( True )
>
> model.append( (1,5) )
> model.append( (8,3) )
> model.append( (2,6) )
> model.append( (3,8) )
>
> window = gtk.Window( gtk.WINDOW_TOPLEVEL )
> window.add( tree )
> window.connect( "destroy", gtk.main_quit )
> window.show_all()
> gtk.main()
>