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/*
Copyright (C) 2006 Paul Davis
Author: Hans Fugal
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_command_h__
#define __lib_pbd_command_h__
#include <string>
#include "pbd/libpbd_visibility.h"
#include "pbd/signals.h"
#include "pbd/statefuldestructible.h"
/** Base class for Undo/Redo commands and changesets */
class LIBPBD_API Command : public PBD::StatefulDestructible, public PBD::ScopedConnectionList
{
public:
virtual ~Command() { /* NOTE: derived classes must call drop_references() */ }
virtual void operator() () = 0;
void set_name (const std::string& str) { _name = str; }
const std::string& name() const { return _name; }
virtual void undo() = 0;
virtual void redo() { (*this)(); }
virtual XMLNode &get_state();
virtual int set_state(const XMLNode&, int /*version*/) { /* noop */ return 0; }
virtual bool empty () const {
return false;
}
protected:
Command() {}
Command(const std::string& name) : _name(name) {}
std::string _name;
};
#endif // __lib_pbd_command_h_
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