4 * Copyright (C) 2008 Adam Williams <broadcast at earthling dot net>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 #ifndef UNDOSTACKITEM_H
23 #define UNDOSTACKITEM_H
28 class UndoStackItem : public ListItem<UndoStackItem>
32 virtual ~UndoStackItem();
34 void set_description(const char *description);
35 void set_creator(void *creator);
37 // This function must be overridden in derived objects.
38 // It is called both to undo and to redo an operation.
39 // The override must do the following:
40 // - change the EDL to undo an operation;
41 // - change the internal information of the item so that the next invocation
42 // of undo() does a redo (i.e. undoes the undone operation).
45 // Return the amount of memory used for the data associated with this
46 // object in order to enable limiting the amount of memory used by the
48 // Ignore overhead and just report the specific data values that the
49 // derived object adds.
50 virtual int get_size();
53 // command description for the menu item
55 // who created this item