Re: Getting the TreeModelColumns from a Glade file

[Dominik Gabi <dkgispam gmail com>]

On 06/14/2010 02:46 AM, José Alburquerque wrote:
> On Sat, 2010-06-12 at 06:40 +0200, Dominik Gabi wrote:
>    
> > Hi,
> >
> > I'd like to set and get the values of a Gtk::TreeStore that I've
> > instantiated in Glade. I'd like to do this the way it is done in the
> > gtkmm-tutorial (with the overloaded [] operator of the TreeRow).
> >      
> If you can get the model using Gtk::Builder::get_object(), it should be
> possible to get to a desired row by dereferencing an iterator of the
> model (see Gtk::TreeModel::get_iter()[1] and the section on "Iterating
> over Model Rows"[2] in the online book).  You would have to define a
> Gtk::TreeModelColumnRecord corresponding to the model so that something
> like:
>
> (*iter)[columns.a_column] = ...;
>
> could be done.
>
> [1]
> http://library.gnome.org/devel/gtkmm/stable/classGtk_1_1TreeModel.html#aebaa795e4920ddc0ec5e39c9f4fbc660
> [2]
> http://library.gnome.org/devel/gtkmm-tutorial/stable/sec-iterating-over-model-rows.html
>
>    
> > The
> > problem is that, I either generate the whole TreeView in the code (which
> > I'd like to avoid, if somehow possible) and specify the necessary
> > TreeModelColumns by hand, or I have to extract them somehow from what is
> > generated in Glade. Since the columns are not objects in Glade, I was
> > hoping I could access them using the model or the view... Unfortunately
> > I can't find anything in the documentation.
> >      
> It should be possible to get the columns of the TreeView (created in
> glade) using Gtk::TreeView::get_column().
>
>    
> > Is there an easier way to manipulate a TreeRow or am I just missing
> > something here?
> >      
>    

Unfortunately Gtk::TreeView::get_column() returns a TreeViewColumn 
whereas Gtk::TreeRow::operator[] takes an TreeModelColumn as argument.
I've solved the problem with the following code which is not as nice as 
the book solution but works fine for now.

enum {TITLE=0, URI, NEW, TYPE};    // Columns

template <class T>
void get_value(Gtk::TreeIter it, int column, T &result)
{
    if (it)
        it->get_value(column, result);
}

template <class T>
void set_value(Gtk::TreeIter it, int column, T &value)
{
    if (it)
        it->set_value(column, value);
}


Regards,
    Dominik.