Sortable Treeview

[Rudra Banerjee <bnrj rudra yahoo com>]

Dear friends,
I am trying to make a Treeview sortable. I have managed to get sortable
by any one column, using
GtkTreeSortable *sortable=GTK_TREE_SORTABLE(data->store);
Code:
gtk_tree_sortable_set_sort_column_id(GTK_TREE_SORTABLE(sortable),
                    ID_YEAR, GTK_SORT_ASCENDING);


which will by default sort by year(or any ID_* that appear last), and
treeview will get that view.
What I am looking for, is make my header clickable to get the sorting,
with initial view completely unsorted.
I only managed to found this information:


but I have no idea how. 
Can you kindly help a bit,

typedef struct _Data
{
  GtkWidget *window;
  GtkListStore *store;
}
Data;

enum
{
  C_TYPE = 0,
  C_NAME,
  C_YEAR,
  C_TITLE,
  NO_COLS
};

enum
  {
    ID_TYPE = 0,
    ID_NAME,
    ID_YEAR,
    ID_TITLE
  };

static void
create_gui (Data *data)
{
  GtkWidget *vbox,
            *cbutton,
            *swindow,
            *tree;
  GtkCellRenderer *cell;

  data->window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
  gtk_window_set_default_size (GTK_WINDOW (data->window), 400, 400);
  g_signal_connect (data->window, "destroy", gtk_main_quit, NULL);

  vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 5);
  gtk_container_add (GTK_CONTAINER (data->window), vbox);

  cbutton = gtk_file_chooser_button_new ("Load bib file",
                                         GTK_FILE_CHOOSER_ACTION_OPEN);
  g_signal_connect (cbutton, "file-set", G_CALLBACK (cb_file_set),
data);
  gtk_box_pack_start (GTK_BOX (vbox), cbutton, FALSE, FALSE, 0);

  swindow = gtk_scrolled_window_new (NULL, NULL);
  gtk_box_pack_start (GTK_BOX (vbox), swindow, TRUE, TRUE, 0);

  data->store = gtk_list_store_new (NO_COLS, G_TYPE_STRING,
G_TYPE_STRING,
                                    G_TYPE_STRING, G_TYPE_STRING);

  GtkTreeSortable *sortable=GTK_TREE_SORTABLE(data->store);
/*  gtk_tree_sortable_set_sort_column_id(GTK_TREE_SORTABLE(sortable), 
                    ID_NAME, GTK_SORT_ASCENDING);
*/ 
  gtk_tree_sortable_set_sort_column_id(GTK_TREE_SORTABLE(sortable), 
                    ID_YEAR, GTK_SORT_ASCENDING);

  tree = gtk_tree_view_new_with_model (GTK_TREE_MODEL (data->store));
  gtk_container_add (GTK_CONTAINER (swindow), tree);

  cell = gtk_cell_renderer_text_new ();
  gtk_tree_view_insert_column_with_attributes (GTK_TREE_VIEW (tree), -1,
                                               "Type", cell,
                                               "text", C_TYPE,
                                               NULL);

  cell = gtk_cell_renderer_text_new ();
  gtk_tree_view_insert_column_with_attributes (GTK_TREE_VIEW (tree), -1,
                                               "Name", cell,
                                               "text", C_NAME,
                                               NULL);

  cell = gtk_cell_renderer_text_new ();
  gtk_tree_view_insert_column_with_attributes (GTK_TREE_VIEW (tree), -1,
                                               "Year", cell,
                                               "text", C_YEAR,
                                               NULL);

  cell = gtk_cell_renderer_text_new ();
  gtk_tree_view_insert_column_with_attributes (GTK_TREE_VIEW (tree), -1,
                                               "Title", cell,
                                               "text", C_TITLE,
                                               NULL);
  gtk_tree_view_set_headers_clickable(GTK_TREE_VIEW(tree),TRUE);
  gtk_widget_show_all (vbox);
}


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