Paul Davis
8713667ec1
git-svn-id: svn://localhost/ardour2/branches/3.0@5787 d708f5d6-7413-0410-9779-e7cbd77b26cf
100 lines
2.3 KiB
C++
100 lines
2.3 KiB
C++
/*
|
|
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, Stateful::current_state_version);
|
|
}
|
|
}
|
|
|
|
void undo() {
|
|
if (before) {
|
|
obj.set_state(*before, Stateful::current_state_version);
|
|
}
|
|
}
|
|
|
|
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__
|