Get values from multiselect TreeView

[Goulven]

Hi,
I’m trying to retrieve the values ​​of selected rows from a TreeView, but I’m having trouble (Gtkmm/Gtk4.6.9).

This is how I declared my TreeView:

  Gtk::TreeView m_TreeView;
  class ModelColumns : public Gtk::TreeModel::ColumnRecord {
  public:
    ModelColumns()
    { add(m_col_name);}
    Gtk::TreeModelColumn<Glib::ustring> m_col_name;
  };
  ModelColumns m_Columns;

In “Gtk::SelectionMode::SINGLE” mode I get the selected value like this:

  Glib::RefPtr<Gtk::TreeSelection> selection = m_TreeView.get_selection();
  Gtk::TreeModel::iterator selectedRow = selection->get_selected();
  Gtk::TreeModel::Row row = *selectedRow;
  Glib::ustring name = row.get_value(m_Columns.m_col_name);
  std::cout << "name: " << name<< std::endl;

On the other hand, I don’t know how to do it in “Gtk::SelectionMode::MULTIPLE” mode. I can loop over the selected lines, but how can I retrieve the values?

  Glib::RefPtr<Gtk::TreeSelection> selection = m_TreeView.get_selection();
  std::vector<Gtk::TreeModel::Path> selected_rows = selection->get_selected_rows();
  std::vector<Gtk::TreeModel::Path>::iterator TreePath_iterator = selected_rows.begin();

  while(TreePath_iterator != selected_rows.end())
  {
    Glib::ustring out_name; // == ???
    std::cout << "TreePath_iterator: " << out_name << std::endl;
    TreePath_iterator++;
  }

Thanks in advance.

[chrisaw (Chris Williams)]

If you haven’t gotten too far along, I’d strongly recommend considering the newer GtkListView widget. GtkTreeView is deprecated as of GTK 4.10.

In C, you would use gtk_tree_model_get_iter() to get a GtkTreeIter, and then gtk_tree_model_get() to get the value.

I don’t actually know C++, but I think it would look something like this:

for (auto path : selected_rows)
{
    auto row = *(m_TreeView.get_model()->get_iter(path));
    Glib::ustring out_name = row[m_Columns.m_col_name];
}

[Goulven]

Thanks, it works. Actually, I knew that GtkTreeView was deprecated since GTK 4.10 but I wanted to continue with this example, just to move forward with other parts of my code. I’m going to switch to the GtkListView widget.