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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.
*/
#ifndef __lib_pbd_undo_h__
#define __lib_pbd_undo_h__
#include <string>
#include <list>
#include <map>
#include <sigc++/slot.h>
#include <sigc++/bind.h>
#ifndef COMPILER_MSVC
#include <sys/time.h>
#else
#include <ardourext/misc.h>
#endif
#include "pbd/libpbd_visibility.h"
#include "pbd/command.h"
typedef sigc::slot<void> UndoAction;
class LIBPBD_API UndoTransaction : public Command
{
public:
UndoTransaction ();
UndoTransaction (const UndoTransaction&);
UndoTransaction& operator= (const UndoTransaction&);
~UndoTransaction ();
void clear ();
bool empty() const;
bool clearing () const { return _clearing; }
void add_command (Command* const);
void remove_command (Command* const);
void operator() ();
void undo();
void redo();
XMLNode &get_state();
void set_timestamp (struct timeval &t) {
_timestamp = t;
}
const struct timeval& timestamp() const {
return _timestamp;
}
private:
std::list<Command*> actions;
struct timeval _timestamp;
bool _clearing;
friend void command_death (UndoTransaction*, Command *);
void about_to_explicitly_delete ();
};
class LIBPBD_API UndoHistory : public PBD::ScopedConnectionList
{
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(); }
std::string next_undo() const { return (UndoList.empty() ? std::string() : UndoList.back()->name()); }
std::string next_redo() const { return (RedoList.empty() ? std::string() : RedoList.back()->name()); }
void clear ();
void clear_undo ();
void clear_redo ();
/* returns all or part of the history.
If depth==0 it returns just the top
node. If depth<0, it returns everything.
If depth>0, it returns state for that
many elements of the history, or
the full history, whichever is smaller.
*/
XMLNode &get_state(int32_t depth = 0);
void save_state();
void set_depth (uint32_t);
PBD::Signal0<void> Changed;
PBD::Signal0<void> BeginUndoRedo;
PBD::Signal0<void> EndUndoRedo;
private:
bool _clearing;
uint32_t _depth;
std::list<UndoTransaction*> UndoList;
std::list<UndoTransaction*> RedoList;
void remove (UndoTransaction*);
};
#endif /* __lib_pbd_undo_h__ */
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