8e301e875a
Memento(Redo|Undo)Command has a noop for the undo or redo respectively, and we don't need both before and after state. This is primarily useful for drag start/finish callbacks, and really only makes sense where wrapped by (begin|commit)_reversible_command (a composite command). Also a few more "normal" MementoCommands. git-svn-id: svn://localhost/ardour2/branches/undo@695 d708f5d6-7413-0410-9779-e7cbd77b26cf
89 lines
2.7 KiB
C++
89 lines
2.7 KiB
C++
/*
|
|
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 132 2006-06-29T18:45:16.609763Z fugalh $
|
|
*/
|
|
|
|
#ifndef __lib_pbd_memento_command_h__
|
|
#define __lib_pbd_memento_command_h__
|
|
|
|
#include <pbd/command.h>
|
|
#include <sigc++/slot.h>
|
|
|
|
/** This command class is initialized with before and after mementos
|
|
* (from Stateful::get_state()), so undo becomes restoring the before
|
|
* memento, and redo is restoring the after memento.
|
|
*/
|
|
template <class obj_T>
|
|
class MementoCommand : public Command
|
|
{
|
|
public:
|
|
MementoCommand(obj_T &obj,
|
|
XMLNode &before,
|
|
XMLNode &after
|
|
)
|
|
: obj(obj), before(before), after(after) {}
|
|
void operator() () { obj.set_state(after); }
|
|
void undo() { obj.set_state(before); }
|
|
virtual XMLNode &serialize()
|
|
{
|
|
// obj.id
|
|
// key is "MementoCommand" or something
|
|
// before and after mementos
|
|
}
|
|
// TODO does this need a copy constructor?
|
|
protected:
|
|
obj_T &obj;
|
|
XMLNode &before, &after;
|
|
};
|
|
|
|
template <class obj_T>
|
|
class MementoUndoCommand : public MementoCommand<obj_T>
|
|
{
|
|
public:
|
|
MementoUndoCommand(obj_T &obj,
|
|
XMLNode &before)
|
|
: obj(obj), before(before) {}
|
|
void operator() () { /* noop */ }
|
|
void undo() { obj.set_state(before); }
|
|
virtual XMLNode &serialize()
|
|
{
|
|
// obj.id
|
|
// key is "MementoCommand" or something
|
|
// before and after mementos
|
|
}
|
|
}
|
|
|
|
template <class obj_T>
|
|
class MementoRedoCommand : public MementoCommand<obj_T>
|
|
{
|
|
public:
|
|
MementoUndoCommand(obj_T &obj,
|
|
XMLNode &after)
|
|
: obj(obj), after(after) {}
|
|
void operator() () { obj.set_state(after); }
|
|
void undo() { /* noop */ }
|
|
virtual XMLNode &serialize()
|
|
{
|
|
// obj.id
|
|
// key is "MementoCommand" or something
|
|
// before and after mementos
|
|
}
|
|
}
|
|
|
|
#endif // __lib_pbd_memento_h__
|