Re: Getting the TreeModelColumns from a Glade file

[José Alburquerque <jaalburquerque cox net>]

On Tue, 2010-06-15 at 11:24 +0200, Dominik Gabi wrote: 
> >> 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.

You could have used the Gtk::TreeRow::operator[] as in the book if you
had defined your own Gtk::TreeModelColumnRecord (see its docs[1]).  For
example, take a look at the small test (along with the glade file) I
wrote to confirm my first answer.  It uses a Gtk:ListStore for the model
but it should show what I'm trying to explain.  Hope it helps.

[1]
http://library.gnome.org/devel/gtkmm/2.90/classGtk_1_1TreeModelColumnRecord.html#_details

-- 
José





#include <gtkmm.h>
#include <iostream>

class ModelColumns : public Gtk::TreeModelColumnRecord
{
public:

  ModelColumns()
    { add(id); add(name); }

  Gtk::TreeModelColumn<int> id;
  Gtk::TreeModelColumn<Glib::ustring> name;
};

int main(int argc, char** argv)
{
  Gtk::TreeView* treeview;

  Gtk::Main kit(argc, argv);

  ModelColumns columns;

  Glib::RefPtr<Gtk::Builder> builder =
    Gtk::Builder::create_from_file("liststore.glade");

  builder->get_widget("treeview1", treeview);

  Glib::RefPtr<Gtk::ListStore> liststore = 
    Glib::RefPtr<Gtk::ListStore>::cast_static(builder->get_object("liststore1"));

  if(!treeview || !liststore)
  {
    std::cerr << "Could not load treeview and liststore." << std::endl;
    return 1;
  }

  typedef Gtk::TreeModel::Children type_children; //minimise code length.
  type_children children = liststore->children();
  for(type_children::iterator iter = children.begin();
    iter != children.end(); ++iter)
  {
    Gtk::TreeModel::Row row = *iter;
    std::cout << row[columns.id] << " - " << row[columns.name] << "." <<
      std::endl;
  }

  for(int i = 0; i < 3; i++)
  {
    Gtk::TreeViewColumn* column = treeview->get_column(i);
    if(!column)
      std::cout << "Could not get column #" << i << std::endl;
    else
      std::cout << "Column #" << i << "'s width = " << column->get_width() <<
        std::endl;
  }
}

Attachment: liststore.glade
Description: application/glade