2 Copyright (C) 2002 Brett Viren & Paul Davis
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 #ifndef __lib_pbd_undo_h__
21 #define __lib_pbd_undo_h__
26 #include <sigc++/slot.h>
27 #include <sigc++/bind.h>
30 #include "pbd/signals.h"
31 #include "pbd/command.h"
33 typedef sigc::slot<void> UndoAction;
35 class UndoTransaction : public Command, public PBD::ScopedConnectionList
39 UndoTransaction (const UndoTransaction&);
40 UndoTransaction& operator= (const UndoTransaction&);
44 bool clearing () const { return _clearing; }
46 void add_command (Command* const);
47 void remove_command (Command* const);
55 void set_timestamp (struct timeval &t) {
59 const struct timeval& timestamp() const {
64 std::list<Command*> actions;
65 struct timeval _timestamp;
68 friend void command_death (UndoTransaction*, Command *);
70 friend class UndoHistory;
73 void about_to_explicitly_delete ();
76 class UndoHistory : public PBD::ScopedConnectionList
82 void add (UndoTransaction* ut);
83 void undo (unsigned int n);
84 void redo (unsigned int n);
86 unsigned long undo_depth() const { return UndoList.size(); }
87 unsigned long redo_depth() const { return RedoList.size(); }
89 std::string next_undo() const { return (UndoList.empty() ? std::string() : UndoList.back()->name()); }
90 std::string next_redo() const { return (RedoList.empty() ? std::string() : RedoList.back()->name()); }
96 /* returns all or part of the history.
97 If depth==0 it returns just the top
98 node. If depth<0, it returns everything.
99 If depth>0, it returns state for that
100 many elements of the history, or
101 the full history, whichever is smaller.
104 XMLNode &get_state(int32_t depth = 0);
107 void set_depth (uint32_t);
109 PBD::Signal0<void> Changed;
110 PBD::Signal0<void> BeginUndoRedo;
111 PBD::Signal0<void> EndUndoRedo;
116 std::list<UndoTransaction*> UndoList;
117 std::list<UndoTransaction*> RedoList;
119 void remove (UndoTransaction*);
123 #endif /* __lib_pbd_undo_h__ */