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ardour/libs/pbd3/pbd/command.h

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r132@gandalf: fugalh | 2006-06-29 12:45:16 -0600 Coding for undo/redo starts in earnest. Paul and I decided to go with a standard gang of four Command pattern, with serialization. This overcomes the terrible difficulties we were having with static type checking and the sigc++ approach. I'm adding the requirement that each command support undo, simplifying undo/redo. NOTE that an important fallout here is that Command::operator()() is the opposite of the old UndoAction::operator()(), i.e. Command::operator()() is execute/redo, and Command::undo() is undo. This commit is a reworking of the infrastructure, and won't compile until creating Command subclasses for the various commands being performed. That is primarily where you find get_memento and/or calls to add_(undo|redo.*). git-svn-id: svn://localhost/ardour2/branches/undo@655 d708f5d6-7413-0410-9779-e7cbd77b26cf
2006-06-29 18:49:03 +00:00
/*
Copyright (C) 2006 Hans Fugal & 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: /local/undo/libs/pbd3/pbd/undo.h 80 2006-06-22T22:37:01.079855Z fugalh $
*/
r154@gandalf: fugalh | 2006-06-30 11:16:27 -0600 fixed guard defines git-svn-id: svn://localhost/ardour2/branches/undo@660 d708f5d6-7413-0410-9779-e7cbd77b26cf
2006-06-30 17:23:12 +00:00
#ifndef __lib_pbd_command_h__
#define __lib_pbd_command_h__
r132@gandalf: fugalh | 2006-06-29 12:45:16 -0600 Coding for undo/redo starts in earnest. Paul and I decided to go with a standard gang of four Command pattern, with serialization. This overcomes the terrible difficulties we were having with static type checking and the sigc++ approach. I'm adding the requirement that each command support undo, simplifying undo/redo. NOTE that an important fallout here is that Command::operator()() is the opposite of the old UndoAction::operator()(), i.e. Command::operator()() is execute/redo, and Command::undo() is undo. This commit is a reworking of the infrastructure, and won't compile until creating Command subclasses for the various commands being performed. That is primarily where you find get_memento and/or calls to add_(undo|redo.*). git-svn-id: svn://localhost/ardour2/branches/undo@655 d708f5d6-7413-0410-9779-e7cbd77b26cf
2006-06-29 18:49:03 +00:00
#include <pbd/serializable.h>
class Command : public Serializable
{
public:
virtual ~Command();
virtual void operator() () = 0;
virtual void undo() = 0;
virtual void redo() { (*this)(); }
protected:
Command();
};
r154@gandalf: fugalh | 2006-06-30 11:16:27 -0600 fixed guard defines git-svn-id: svn://localhost/ardour2/branches/undo@660 d708f5d6-7413-0410-9779-e7cbd77b26cf
2006-06-30 17:23:12 +00:00
#endif // __lib_pbd_command_h_
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