Re: Errors removing rows from treestore

[Bob Caryl <bob fis-cal com>]

The following are guesses made after reading the docs on TreeModelFilter:

First off, you probably will want to convert the iterator passed to your 
callback slot to an iterator in the child TreeModel you used to create 
your TreeModelFilter using:

Gtk::TreeModelFilter::convert_iter_to_child_iter()

since, most probably, the iter being passed to your callback is from the 
TreeModelFilter instead of the actual TreeModel you originally populated.

Next, you make the assumption that the iterator "child" is valid.  
Instead of the while loop you are employing, try this instead:

for(child = nodeChildren.begin(); child ; child = 
refTreeModel->erase(*child));

At least this way, you won't get any invalid child object errors.

Bob

Matt Bragano wrote:
> After much help, I've successfully implemented a TreeModel with a 
> TreeModelFilter.  However, I've noticed that if I expand a node, 
> collapse it and expand it again, the contents are "doubled".  That is, 
> if the expanded row contained items A and B, on the second expansion 
> the items in the row are now A B A B.
>
> I tried using a model column flag to determine if the tree had been 
> expanded once prior, but with no luck.  Now I'm trying to simply 
> remove the child rows in the on_row_collapsed() method like this:
>
> void on_row_collapsed(const Gtk::TreeModel::iterator& iter,
>                                      const Gtk::TreeModel::Path &path) {
>
> Gtk::TreeModel::Row row = *iter;
>
> const Gtk::TreeNodeChildren &nodeChildren = row.children();
>
> Gtk::TreeModel::Children::iterator child = nodeChildren.begin();
>
> while(child != nodeChildren.end()) {
>
>    child = refTreeModel->erase(*child);  // this causes errors
>
> }
>
> }
>
>
> The problem is that every time the while loop is executed I recieve 
> this error:
>
> Gtk-CRITICAL **: gtk_tree_store_remove: assertion `VALID_ITER (iter, 
> tree_store)' failed
>
> Any ideas as to what is the problem here?  Or is there a better way to 
> work around the doubled-up rows I'm running into?
>
> Thanks,
> Matt Bragano
> _______________________________________________
> gtkmm-list mailing list
> gtkmm-list gnome org
> http://mail.gnome.org/mailman/listinfo/gtkmm-list
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