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/*
Copyright (C) 2002 Brett Viren & Paul Davis
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 2 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, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
$Id$
*/
#ifndef __lib_pbd_undo_h__
#define __lib_pbd_undo_h__
#include <string>
#include <list>
#include <map>
#include <sigc++/slot.h>
#include <sigc++/bind.h>
#include <sys/time.h>
#include <pbd/command.h>
using std::string;
using std::list;
typedef sigc::slot<void> UndoAction;
class UndoTransaction : public Command
{
public:
UndoTransaction ();
UndoTransaction (const UndoTransaction&);
UndoTransaction& operator= (const UndoTransaction&);
void clear ();
void add_command (Command *const);
void operator() ();
void undo();
void redo();
XMLNode &get_state();
void set_name (const string& str) {
_name = str;
}
const string& name() const { return _name; }
void set_timestamp (struct timeval &t) {
_timestamp = t;
}
const struct timeval& timestamp() const {
return _timestamp;
}
private:
list<Command*> actions;
struct timeval _timestamp;
string _name;
};
class UndoHistory
{
public:
UndoHistory() {}
~UndoHistory() {}
void add (UndoTransaction ut);
void undo (unsigned int n);
void redo (unsigned int n);
unsigned long undo_depth() const { return UndoList.size(); }
unsigned long redo_depth() const { return RedoList.size(); }
string next_undo() const { return (UndoList.empty() ? string("") : UndoList.back().name()); }
string next_redo() const { return (RedoList.empty() ? string("") : RedoList.back().name()); }
void clear ();
void clear_undo ();
void clear_redo ();
XMLNode &get_state();
void save_state();
private:
list<UndoTransaction> UndoList;
list<UndoTransaction> RedoList;
};
#endif /* __lib_pbd_undo_h__ */
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