Re: Control on Tree Row collapsing

[Torsten Schoenfeld <kaffeetisch gmx de>]

On Mon, 2006-12-18 at 00:09 +0530, Ashwin Ramachandran wrote:

> With the signal for tree-collapse-row, I can now get the path and iter
> of the row collapsed.
> but how do I use that information to get information on whether that
> path[ie DEF] is the parent
> or parent's parent for 456[Assuming I have information pertaining to
> the iter and path of 456]. 
>
> Is there any direct API to verify that?
>
> I checked ancestor and descendant, but both do not seem to work.

I think Gtk2::TreePath::is_ancestor or Gtk2::TreePath::is_descendant
should work.  Are you sure they don't do what you want?  Untested code:

  $view->signal_connect(test_collapse_row => sub {
    my ($view, $iter, $path) = @_;

    my $selected_iter = $view->get_selection->get_selected;
    my $selected_path = $view->get_model->get_path ($selected_iter);

    if ($path->is_ancestor($selected_path)) {
      # ask the user and return TRUE or FALSE accordingly
    }

    return TRUE; # allow collapsing
  });

(For the record: displaying a modal dialog simply because the user
collapsed a row seems rather strange.  There's no potential for data
loss and nothing happened that can't be reversed easily.  So I don't see
the need to get in the way of the user.)

-- 
Bye,
-Torsten