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/usr/include/claws-mail/undo.h is in libclaws-mail-dev 3.9.3-1ubuntu1.

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/*
 * Sylpheed -- a GTK+ based, lightweight, and fast e-mail client
 * Copyright (C) 1999-2012 Hiroyuki Yamamoto and the Claws Mail team
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 * 
 */

/* code ported from gedit */

#ifndef __UNDO_H__
#define __UNDO_H__

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

typedef enum 
{
	UNDO_ACTION_INSERT,
	UNDO_ACTION_DELETE,
	UNDO_ACTION_REPLACE_INSERT,
	UNDO_ACTION_REPLACE_DELETE
} UndoAction;

typedef enum 
{
	UNDO_STATE_TRUE,
	UNDO_STATE_FALSE,
	UNDO_STATE_UNCHANGED,
	UNDO_STATE_REFRESH
} UndoState;

typedef struct _UndoMain UndoMain;

typedef void (*UndoChangeStateFunc)	(UndoMain	*undostruct,
					 gint		 undo_state,
					 gint		 redo_state,
					 gpointer	 data);

struct _UndoMain 
{
	GtkTextView *textview;

	GList *undo;
	GList *redo;

	UndoChangeStateFunc change_state_func;
	gpointer change_state_data;

	gboolean undo_state : 1;
	gboolean redo_state : 1;

	gint paste;
	gint wrap;
};

UndoMain *undo_init		(GtkWidget		*text);
void undo_destroy		(UndoMain		*undostruct);

void undo_set_change_state_func	(UndoMain		*undostruct,
				 UndoChangeStateFunc	 func,
				 gpointer		 data);

void undo_undo			(UndoMain		*undostruct); 
void undo_redo			(UndoMain		*undostruct); 
void undo_block			(UndoMain 		*undostruct);
void undo_unblock		(UndoMain 		*undostruct);
void undo_wrapping		(UndoMain		*undostruct, 
				 gboolean 		 wrap);
void undo_paste_clipboard	(GtkTextView 		*textview, 
				 UndoMain 		*undostruct);
#endif /* __UNDO_H__ */