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undo.h

/* logjam - a GTK client for LiveJournal.
 * Copyright (C) 2000-2003 Evan Martin <evan@livejournal.com>
 * Ported to LogJam by Ari Pollak <ari@debian.org>
 * 
 * This file is based on gedit-undo-manager.h from gEdit 2.2.1.
 * Original authors:
 * Copyright (C) 1998, 1999 Alex Roberts, Evan Lawrence
 * Copyright (C) 2000, 2001 Chema Celorio, Paolo Maggi 
 */

#ifndef __UNDOMGR_H__
#define __UNDOMGR_H__

#define TYPE_UNDOMGR                      (undomgr_get_type ())
#define UNDOMGR(obj)                      (GTK_CHECK_CAST ((obj), TYPE_UNDOMGR, UndoMgr))
#define UNDOMGR_CLASS(klass)        (GTK_CHECK_CLASS_CAST ((klass), TYPE_UNDOMGR, UndoMgrClass))
#define IS_UNDOMGR(obj)             (GTK_CHECK_TYPE ((obj), TYPE_UNDOMGR))
#define IS_UNDOMGR_CLASS(klass)     (GTK_CHECK_CLASS_TYPE ((klass), TYPE_UNDOMGR))
#define UNDOMGR_GET_CLASS(obj)            (GTK_CHECK_GET_CLASS ((obj), TYPE_UNDOMGR, UndoMgrClass))


typedef struct _UndoMgrPrivate            UndoMgrPrivate;

typedef struct 
{
      GObject base;
      
      UndoMgrPrivate *priv;
} UndoMgr;

typedef struct
{
      GObjectClass parent_class;

      /* Signals */
      void (*can_undo)( UndoMgr *um, gboolean can_undo);
      void (*can_redo)( UndoMgr *um, gboolean can_redo);
} UndoMgrClass;

GType             undomgr_get_type  (void) G_GNUC_CONST;

GObject*          undomgr_new       (void);
void              undomgr_attach          (UndoMgr *um, GtkWidget *widget);
void              undomgr_detach          (UndoMgr *um, GtkWidget *widget);

/* Clears the stack of undo actions: */
void              undomgr_reset           (UndoMgr *um);

gboolean          undomgr_can_undo  (const UndoMgr *um);
gboolean          undomgr_can_redo  (const UndoMgr *um);

void              undomgr_undo      (UndoMgr *um);
void              undomgr_redo      (UndoMgr *um);

void  undomgr_begin_not_undoable_action   (UndoMgr *um);
void  undomgr_end_not_undoable_action     (UndoMgr *um);

#endif /* __UNDOMGR_H__ */

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