Re: Using a TreeStore with a ComboBox

[Jef Driesen <jefdriesen hotmail com>]

Andrew E. Makeev wrote:
> В Чтв, 21/06/2007 в 10:53 -0500, Jonathon Jongsma пишет:
> > On 6/21/07, Jef Driesen <jefdriesen hotmail com> wrote:
> > > Using a treestore model with a combobox creates a nice dropdown list
> > > with submenus. Inside each submenu, the parent item is shown with a
> > > separator below to separate it from its children. I want to know how I
> > > can hide this parent node, so I can only select leaf nodes (e.g items
> > > without children).
> > >
> > > The model contains places that can be are arranged by the user in an
> > > arbitrary hierarchy, to group related places together (for instance by
> > > continent and/or country). This is very similar how files (my places)
> > > can be arranged into directories (my hierarchy). But when the user needs
> > > to select a place with the combobox, it doesn't make sense to be able to
> > > select an item that is not a place.
> > You could probably accomplish this fairly easily with TreeModelFilter
> > (http://gtkmm.org/docs/gtkmm-2.4/docs/reference/html/classGtk_1_1TreeModelFilter.html)
> > wrapping your existing treestore. You'd just need to provide a
> > function which checks whether a node has children or not, and pass
> > that function to TreeModelFilter::set_visible_func().  Hope that
> > helps.
>
> No, TreeFilterModel wouldn't work in way you need that.
>
> I found this in some tutor for GTK(MM).
> Use set_select_function for selection object of your TreeView.
> In that function you should check if you select leaf node and return
> true or false.
>
> ...
>     selectionObject = view.get_selection();
>     selectionObject->set_mode( Gtk::SELECTION_SINGLE );
>
>     selectionObject->set_select_function( sigc::mem_fun( *this, &EnvList::check_select ) );
> ...
>
> bool EnvList::check_select
>    (const Glib::RefPtr<Gtk::TreeModel>& model,
>     const Gtk::TreeModel::Path& path, bool)
> {
>     const Gtk::TreeModel::iterator iter = model->get_iter (path);
>     return iter->children ().empty (); // only allow leaf nodes to be selected
> }

This stuff only exists for a treeview, not for a combobox.