setting check buttons in treeview

[Rob Clack <rnc sanger ac uk>]

I'm using gtk 2.2.4 and Red Hat 9.

I have a variable list of "things" my users can switch on and off, so I 
populated a treeview with check buttons and text, stuck that in a 
scrolled window and put that in the new window.

This may not be the best way to do what I want, so I'm quite happy to 
hear suggestions of alternatives, which is why I'm posting to this 
newsgroup.  However, assuming I'm headed in the right direction, I now 
have a problem.

The list displays fine and I can preset the check buttons to ON or OFF, 
and when I click a button my callback gets called and I can detect the 
current setting.

The difficulty is setting the button to it's opposite toggle value. ie 
if it's ON and I click it, it should be set to OFF.  I found a posting 
by Bijoy Chandrasekharan dated May 2003 in which he did what I want, thus

gtk_tree_store_set(GTK_TREE_STORE(model), &iter, BUTTON, FALSE);

but when I run this I get gtk errors:

(cols:29538): GLib-GObject-WARNING **: invalid cast from 
`GtkTreeModelSort' to `GtkTreeStore'

(cols:29538): Gtk-CRITICAL **: file gtktreestore.c: line 1039 
(gtk_tree_store_set): assertion `GTK_IS_TREE_STORE (tree_store)' failed


Anybody know why it works for him and not for me?

I attach a cut-down example of my app.

Thanks in advance!
Rob Clack
=======================================================================

#include <stdio.h>
#include <glib.h>
#include <gtk/gtk.h>

enum { BUTTON, NAME, N_COLUMNS };


/* function prototypes ***************************************************/
static void zMapWindowCreateColumnWindow();
static void addColToTree              (char *column,gboolean active, 
GtkTreeStore *tree);
static void quitListCB                (GtkWidget *window, gpointer data);
static int tree_selection_changed_cb (GtkTreeSelection *selection, 
gpointer data);


/* functions *************************************************************/
/** \Brief Displays a list of columns
 *
 * Each column can be selected as hidden or visible.
 */

static void zMapWindowCreateColumnWindow()
{
  GtkWidget *window, *columnList, *scrolledWindow;
  GtkTreeModel *model;
  GtkCellRenderer *renderer;
  GtkTreeViewColumn *buttonColumn, *column;
  GtkTreeSelection *select;
  GtkTreeStore *tree;
  int i;
  char *columns[] = {"one", "two", "three", "four"};


  tree = gtk_tree_store_new(N_COLUMNS,
                            G_TYPE_BOOLEAN,
                            G_TYPE_STRING);

  /* set up the top level window */
  window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
  gtk_container_border_width(GTK_CONTAINER(window), 5) ;
  gtk_window_set_title(GTK_WINDOW(window), "Columns") ;
  gtk_window_set_default_size(GTK_WINDOW(window), -1, 600);

  scrolledWindow = gtk_scrolled_window_new(NULL, NULL);
  gtk_container_add(GTK_CONTAINER(window), scrolledWindow);
  gtk_scrolled_window_set_policy(GTK_SCROLLED_WINDOW(scrolledWindow),
                                 GTK_POLICY_NEVER, GTK_POLICY_AUTOMATIC);

  /* Build and populate the list of features */
  for (i = 0; i < 4; i++)
      addColToTree(columns[i], FALSE, tree) ;

  model = gtk_tree_model_sort_new_with_model (GTK_TREE_MODEL(tree));
  columnList = gtk_tree_view_new_with_model(GTK_TREE_MODEL(model));

  /* finished with tree now */
  g_object_unref(G_OBJECT(tree));

  /* render the columns. */
  renderer = gtk_cell_renderer_toggle_new();
  buttonColumn = gtk_tree_view_column_new_with_attributes ("Button",
                                                     renderer,
                                                     "active", BUTTON,
                                                     NULL);
  gtk_tree_view_append_column (GTK_TREE_VIEW (columnList), buttonColumn);
  gtk_tree_view_column_set_visible(buttonColumn, TRUE);

  renderer = gtk_cell_renderer_text_new ();
  column = gtk_tree_view_column_new_with_attributes ("Text",
                                                     renderer,
                                                     "text", NAME,
                                                     NULL);
  gtk_tree_view_append_column (GTK_TREE_VIEW (columnList), column);
  gtk_tree_view_column_set_visible(column, TRUE);
                        
  /* Setup the selection handler */
  select = gtk_tree_view_get_selection (GTK_TREE_VIEW (columnList));
  gtk_tree_selection_set_mode (select, GTK_SELECTION_SINGLE);

  g_signal_connect (G_OBJECT (select), "changed",
                    G_CALLBACK (tree_selection_changed_cb),
                    buttonColumn);

  g_signal_connect(GTK_OBJECT(window), "destroy",
                   GTK_SIGNAL_FUNC(quitListCB), columnList);

  gtk_container_add(GTK_CONTAINER(scrolledWindow), columnList);

  gtk_widget_show_all(window);

  return;
}





/***************** Internal functions ************************************/
/** \Brief Load a column into the tree.
 *
 * Loads the tree with a column's info and a button to hide/show it.
 */
static void addColToTree(char *column, gboolean active, GtkTreeStore *tree)
{
  GtkTreeIter iter;

  gtk_tree_store_append(GTK_TREE_STORE(tree), &iter, NULL);
  gtk_tree_store_set   (GTK_TREE_STORE(tree), &iter,
                        BUTTON, active,
                        NAME, column,
                        -1 );
  return;
}


static int tree_selection_changed_cb (GtkTreeSelection *selection, 
gpointer data)
{
  GtkTreeIter iter;
  GtkTreeModel *model;
  gchar *name;
  gboolean active;

  if (gtk_tree_selection_get_selected (selection, &model, &iter))
    {
      gtk_tree_model_get (model, &iter, BUTTON, &active, NAME, &name, -1);
    }

  if (active)
    gtk_tree_store_set(GTK_TREE_STORE(model), &iter, BUTTON, FALSE);
  else
    gtk_tree_store_set(GTK_TREE_STORE(model), &iter, BUTTON, TRUE);

  if (name) g_free(name);

  return TRUE;
}






static void quitListCB(GtkWidget *window, gpointer data)
{
  gtk_widget_destroy(GTK_WIDGET(window));

  gtk_main_quit();

  return;
}




int main( int   argc,
          char *argv[] )
{
  gtk_init (&argc, &argv);

  zMapWindowCreateColumnWindow();

  gtk_main ();

  return 0;
}

/*************************** end of file *********************************/

--
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 The mouth: natural home of the foot
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 Rob Clack                        Acedb Development,  Informatics Group
 email: rnc sanger ac uk                Wellcome Trust Sanger Institute
 Tel: +44 1223 494883                   Wellcome Trust Genome Campus
 Fax: +44 1223 494919                   Hinxton  Cambridge    CB10 1SA