/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */

/* NautilusUndoManager - Manages undo and redo transactions.
 *                       This is the public interface used by the application.                      
 *
 * Copyright (C) 2000 Eazel, Inc.
 *
 * Author: Gene Z. Ragan <gzr@eazel.com>
 *
 * 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 NAUTILUS_UNDO_MANAGER_H
#define NAUTILUS_UNDO_MANAGER_H

#include <bonobo/bonobo-object.h>

#define NAUTILUS_TYPE_UNDO_MANAGER \
	(nautilus_undo_manager_get_type ())
#define NAUTILUS_UNDO_MANAGER(obj) \
	(GTK_CHECK_CAST ((obj), NAUTILUS_TYPE_UNDO_MANAGER, NautilusUndoManager))
#define NAUTILUS_UNDO_MANAGER_CLASS(klass) \
	(GTK_CHECK_CLASS_CAST ((klass), NAUTILUS_TYPE_UNDO_MANAGER, NautilusUndoManagerClass))
#define NAUTILUS_IS_UNDO_MANAGER(obj) \
        (GTK_CHECK_TYPE ((obj), NAUTILUS_TYPE_UNDO_MANAGER))
#define NAUTILUS_IS_UNDO_MANAGER_CLASS(klass) \
	(GTK_CHECK_CLASS_TYPE ((klass),	NAUTILUS_TYPE_UNDO_MANAGER))
	
typedef struct NautilusUndoManagerDetails NautilusUndoManagerDetails;

typedef struct {
	BonoboObject parent;
	NautilusUndoManagerDetails *details;
} NautilusUndoManager;

typedef struct {
	BonoboObjectClass parent_slot;
	void (* changed) (GtkObject *object, gpointer data);
} NautilusUndoManagerClass;

GtkType              nautilus_undo_manager_get_type                           (void);
NautilusUndoManager *nautilus_undo_manager_new                                (void);

/* Undo operations. */
void                 nautilus_undo_manager_undo                               (NautilusUndoManager *undo_manager);

#ifdef UIH
/* Connect the manager to a particular menu item. */
void                 nautilus_undo_manager_set_up_bonobo_ui_handler_undo_item (NautilusUndoManager *manager,
									       BonoboUIHandler     *handler,
									       const char          *path,
									       const char          *no_undo_menu_item_label,
									       const char          *no_undo_menu_item_hint);

#endif

/* Attach the undo manager to a Gtk object so that object and the widgets inside it can participate in undo. */
void                 nautilus_undo_manager_attach                             (NautilusUndoManager *manager,
									       GtkObject           *object);

/* Attach the undo manager to a Bonobo object so another component can find it. */
void                 nautilus_undo_manager_add_interface                      (NautilusUndoManager *manager,
									       BonoboObject        *object);

#endif /* NAUTILUS_UNDO_MANAGER_H */