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/*
Copyright (C) 2010 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.
*/
#include <iostream>
#include "pbd/stateful_diff_command.h"
#include "pbd/property_list.h"
#include "pbd/demangle.h"
#include "i18n.h"
using namespace std;
using namespace PBD;
/** Create a new StatefulDiffCommand by examining the changes made to a Stateful
* since the last time that clear_history was called on it.
* @param s Stateful object.
*/
StatefulDiffCommand::StatefulDiffCommand (boost::shared_ptr<StatefulDestructible> s)
: _object (s)
, _undo (new PropertyList)
, _redo (new PropertyList)
{
s->diff (*_undo, *_redo, this);
/* if the stateful object that this command refers to goes away,
be sure to notify owners of this command.
*/
s->DropReferences.connect_same_thread (*this, boost::bind (&Destructible::drop_references, this));
}
StatefulDiffCommand::StatefulDiffCommand (boost::shared_ptr<StatefulDestructible> s, XMLNode const & n)
: _object (s)
, _undo (0)
, _redo (0)
{
const XMLNodeList& children (n.children());
for (XMLNodeList::const_iterator i = children.begin(); i != children.end(); ++i) {
if ((*i)->name() == X_("Undo")) {
_undo = s->property_factory (**i);
} else if ((*i)->name() == X_("Do")) {
_redo = s->property_factory (**i);
}
}
assert (_undo != 0);
assert (_redo != 0);
/* if the stateful object that this command refers to goes away,
be sure to notify owners of this command.
*/
s->DropReferences.connect_same_thread (*this, boost::bind (&Destructible::drop_references, this));
}
StatefulDiffCommand::~StatefulDiffCommand ()
{
drop_references ();
delete _undo;
delete _redo;
}
void
StatefulDiffCommand::operator() ()
{
boost::shared_ptr<Stateful> s (_object.lock());
if (s) {
s->set_properties (*_redo);
}
}
void
StatefulDiffCommand::undo ()
{
boost::shared_ptr<Stateful> s (_object.lock());
if (s) {
std::cerr << "Undoing a stateful diff command\n";
s->set_properties (*_undo);
}
}
XMLNode&
StatefulDiffCommand::get_state ()
{
boost::shared_ptr<Stateful> s (_object.lock());
if (!s) {
/* XXX should we throw? */
return * new XMLNode("");
}
XMLNode* node = new XMLNode (X_("StatefulDiffCommand"));
node->add_property ("obj-id", s->id().to_s());
node->add_property ("type-name", demangled_name (*s.get()));
XMLNode* undo = new XMLNode (X_("Undo"));
XMLNode* redo = new XMLNode (X_("Do"));
_undo->add_history_state (undo);
_redo->add_history_state (redo);
node->add_child_nocopy (*undo);
node->add_child_nocopy (*redo);
return *node;
}
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