[Gtk-sharp-list] Sorting a TreeView with a filter

[Adam Tauno Williams]

On Fri, 2008-09-12 at 20:11 -0400, Adam Tauno Williams wrote:
> On Fri, 2008-09-12 at 13:36 -0700, Peter Johanson wrote:
> > On Fri, Sep 12, 2008 at 08:13:46AM -0400, Adam Tauno Williams wrote:
> > > I have a rather complicated TreeView using a ListStore.  Filtering the
> > > view works,  but I'm so far unable to get sorting to work.  I have a
> > > sort object connected to the model and the filter object connected to
> > > the sort object;  I'm found very similair constructs in other projects
> > You need to filter, and *then* sort. This prevents sorting items you'll
> > end up filtering out anyways (speeds things up) and makes it so you have
> > a TreeSortable actually hooked up to the Gtk.TreeView.
> Yep, that helped; setting the TreeModelSort between the filter and the
> view instead of between the Model and the Filter.
> taskFilter = new TreeModelFilter(taskStore, null);
> taskFilter.VisibleFunc = new Gtk.TreeModelFilterVisibleFunc(TaskFilter);
> sortAdapter = new TreeModelSort(taskFilter);
> sortAdapter.SetSortFunc(-2, OrderTasks);
> view.Model = sortAdapter;
> Now I get fewer warnings. :)
> (Whitemice.Consonance:10699): Gtk-CRITICAL **:
> gtk_tree_model_sort_set_sort_column_id: assertion `header != NULL'
> failed
> ColumnClicked
> Sort Column:1 Order:Ascending
> (Whitemice.Consonance:10699): Gtk-CRITICAL **:
> gtk_tree_model_sort_set_sort_column_id: assertion `header != NULL'
> failed
> But the sort method still doesn't get dinged.  The message "header !=
> NULL" I don't understand.

taskFilter = new TreeModelFilter(taskStore, null);
taskFilter.VisibleFunc = new Gtk.TreeModelFilterVisibleFunc(TaskFilter);
sortAdapter = new TreeModelSort(taskFilter);
sortAdapter.DefaultSortFunc = OrderTasks;
view.Model = sortAdapter;

This at least causes the sort method to get called when the view is
initially materialized.  Then filtering the view causes -

(Whitemice.Consonance:19606): Gtk-CRITICAL **:
gtk_tree_model_sort_set_sort_column_id: assertion `header != NULL'
failed
(Whitemice.Consonance:19606): Gtk-WARNING **: Attempting to sort on
invalid type GtkSharpValue
(Whitemice.Consonance:19606): Gtk-WARNING **: Attempting to sort on
invalid type GtkSharpValue
(Whitemice.Consonance:19606): Gtk-WARNING **: Attempting to sort on
invalid type GtkSharpValue
(Whitemice.Consonance:19606): Gtk-WARNING **: Attempting to sort on
invalid type GtkSharpValue
(Whitemice.Consonance:19606): Gtk-WARNING **: Attempting to sort on
invalid type GtkSharpValue
(Whitemice.Consonance:19606): Gtk-WARNING **: Attempting to sort on
invalid type GtkSharpValue
(Whitemice.Consonance:19606): Gtk-WARNING **: Attempting to sort on
invalid type GtkSharpValue
(Whitemice.Consonance:19606): Gtk-WARNING **: Attempting to sort on
invalid type GtkSharpValue

But no hits to the sort method.  Ugh,  I'm really not understanding what
is supposed to happen here.