Re: Errors removing rows from treestore

[Matt Bragano <maestro485 comcast net>]

Ah, I wasn't thinking about the convert_iter_to_child_iter().  That did 
the trick.  And you're right, a for loop would be best applied here.

Thanks for the help,
Matt Bragano


Bob Caryl wrote:
> 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
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