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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_memento_command_h__
#define __lib_pbd_memento_command_h__
#include <iostream>
#include "pbd/command.h"
#include "pbd/stacktrace.h"
#include "pbd/xml++.h"
#include "pbd/shiva.h"
#include <sigc++/slot.h>
#include <typeinfo>
/** 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& a_object, XMLNode* a_before, XMLNode* a_after)
: obj(a_object), before(a_before), after(a_after)
{
/* catch destruction of the object */
new PBD::PairedShiva< obj_T,MementoCommand<obj_T> > (obj, *this);
}
~MementoCommand () {
GoingAway(); /* EMIT SIGNAL */
delete before;
delete after;
}
void operator() () {
if (after) {
obj.set_state(*after);
}
}
void undo() {
if (before) {
obj.set_state(*before);
}
}
virtual XMLNode &get_state() {
std::string name;
if (before && after) {
name = "MementoCommand";
} else if (before) {
name = "MementoUndoCommand";
} else {
name = "MementoRedoCommand";
}
XMLNode* node = new XMLNode(name);
node->add_property("obj_id", obj.id().to_s());
node->add_property("type_name", typeid(obj).name());
if (before) {
node->add_child_copy(*before);
}
if (after) {
node->add_child_copy(*after);
}
return *node;
}
protected:
obj_T& obj;
XMLNode* before;
XMLNode* after;
};
#endif // __lib_pbd_memento_h__
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