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/*
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 * Sylpheed -- a GTK+ based, lightweight, and fast e-mail client
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 * Copyright (C) 1999-2001 Hiroyuki Yamamoto
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 *
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 * This program is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation; either version 2 of the License, or
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 * (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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 */
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/* code ported from gedit */
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#ifndef __UNDO_H__
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#define __UNDO_H__
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#include <glib.h>
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#include <gtk/gtktextview.h>
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#include <gtk/gtkitemfactory.h>
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typedef enum 
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{
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        UNDO_ACTION_INSERT,
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        UNDO_ACTION_DELETE,
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        UNDO_ACTION_REPLACE_INSERT,
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        UNDO_ACTION_REPLACE_DELETE,
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} UndoAction;
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typedef enum 
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{
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        UNDO_STATE_TRUE,
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        UNDO_STATE_FALSE,
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        UNDO_STATE_UNCHANGED,
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        UNDO_STATE_REFRESH,
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} UndoState;
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typedef struct _UndoMain UndoMain;
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typedef void (*UndoChangeStateFunc)        (UndoMain        *undostruct,
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                                         gint                 undo_state,
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                                         gint                 redo_state,
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                                         gpointer         data);
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struct _UndoMain 
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{
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        GtkTextView *textview;
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        GList *undo;
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        GList *redo;
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        UndoChangeStateFunc change_state_func;
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        gpointer change_state_data;
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        gboolean undo_state : 1;
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        gboolean redo_state : 1;
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        gint paste;
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};
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UndoMain *undo_init                (GtkWidget                *text);
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void undo_destroy                (UndoMain                *undostruct);
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void undo_set_change_state_func        (UndoMain                *undostruct,
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                                 UndoChangeStateFunc         func,
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                                 gpointer                 data);
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void undo_undo                        (UndoMain                *undostruct); 
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void undo_redo                        (UndoMain                *undostruct); 
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void undo_block                        (UndoMain                *undostruct);
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void undo_unblock                (UndoMain                *undostruct);
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#endif /* __UNDO_H__ */