65 lines
1.9 KiB
C++
65 lines
1.9 KiB
C++
/*
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* Copyright (C) 2006-2015 Paul Davis <paul@linuxaudiosystems.com>
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* Copyright (C) 2006 Hans Fugal <hans@fugal.net>
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* Copyright (C) 2007-2009 David Robillard <d@drobilla.net>
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* Copyright (C) 2009-2010 Carl Hetherington <carl@carlh.net>
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* Copyright (C) 2015-2016 Robin Gareus <robin@gareus.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef __lib_pbd_command_h__
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#define __lib_pbd_command_h__
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#include <string>
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#include "pbd/libpbd_visibility.h"
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#include "pbd/signals.h"
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#include "pbd/statefuldestructible.h"
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namespace PBD {
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/** Base class for Undo/Redo commands and changesets */
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class LIBPBD_API Command : public PBD::StatefulDestructible, public PBD::ScopedConnectionList
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{
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public:
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virtual ~Command() { /* NOTE: derived classes must call drop_references() */ }
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virtual void operator() () = 0;
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void set_name (const std::string& str) { _name = str; }
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const std::string& name() const { return _name; }
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virtual void undo() = 0;
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virtual void redo() { (*this)(); }
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virtual XMLNode& get_state() const;
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virtual int set_state(const XMLNode&, int /*version*/) { /* noop */ return 0; }
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virtual bool empty () const {
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return false;
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}
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protected:
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Command() {}
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Command(const std::string& name) : _name(name) {}
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std::string _name;
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};
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} /* namespace */
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#endif // __lib_pbd_command_h_
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