Re: Gtk3::TreeSelection and get_selected_rows

[Torsten Schoenfeld <kaffeetisch gmx de>]

On 19.02.2013 05:34, Dan Kasak wrote:
> More Gtk2 ==> Gtk3 questions ...
>
> When I do $tree_selection->get_selected_rows, I get an array, which
> appears to have:
>
> - row[0]: an array of Gtk3::TreePath objects
> - row[1]: the model ( in my case, a Gtk3::ListStore )
>
> Is this expected?

Yes.  Gtk2 does this differently, but I saw no compelling reason to 
uphold this inconsistency with the C API.  This particular change is 
listed in the pod: 
<https://metacpan.org/module/Gtk3#Porting-from-Gtk2-to-Gtk3>.

> http://developer.gnome.org/gtk3/3.0/GtkTreeSelection.html#gtk-tree-selection-get-selected-rows
>
> don't say anything about getting the model back.

C functions can only have one return value; to return more than one 
value, they must use "out" arguments, i.e. reference arguments that get 
set by the function.  "GtkTreeModel **model" is such an argument in this 
case.  These kinds of "out" arguments are mapped to normal return values 
by Glib::Object::Introspection (and hence by Gtk3).