/* gtktreesortable.h
 * Copyright (C) 2001  Red Hat, Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

#ifndef __GTK_TREE_SORTABLE_H__
#define __GTK_TREE_SORTABLE_H__

#include <gtk/gtktreemodel.h>

#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */

typedef enum
{
  GTK_TREE_SORT_ASCENDING,
  GTK_TREE_SORT_DESCENDING
} GtkTreeSortOrder;

#define GTK_TYPE_TREE_SORTABLE            (gtk_tree_sortable_get_type ())
#define GTK_TREE_SORTABLE(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GTK_TYPE_TREE_SORTABLE, GtkTreeSortable))
#define GTK_IS_TREE_SORTABLE(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GTK_TYPE_TREE_SORTABLE))
#define GTK_TREE_SORTABLE_GET_IFACE(obj)  ((GtkTreeSortableIface *)g_type_interface_peek (((GTypeInstance *)GTK_TREE_SORTABLE (obj))->g_class, GTK_TYPE_TREE_SORTABLE))

typedef struct _GtkTreeSortable      GtkTreeSortable; /* Dummy typedef */
typedef struct _GtkTreeSortableIface GtkTreeSortableIface;

struct _GtkTreeSortableIface
{
  GTypeInterface g_iface;

  /* This one is a signal */
  void         (* sort_column_changed) (GtkTreeSortable  *sortable);

  /* virtual methods */
  gboolean     (* column_sortable)     (GtkTreeSortable  *sortable,
                                        gint              column,
                                        GtkTreeSortOrder  order);
  void         (* get_sort_column)     (GtkTreeSortable  *sortable,
                                        gint             *column,
                                        GtkTreeSortOrder *order);
  void         (* set_sort_column)     (GtkTreeSortable  *sortable,
                                        gint              column,
                                        GtkTreeSortOrder  order);
};


GType           gtk_tree_sortable_get_type   (void) G_GNUC_CONST;

#ifdef __cplusplus
}
#endif /* __cplusplus */


#endif /* __GTK_TREE_SORTABLE_H__ */