125 lines
3.2 KiB
C++
125 lines
3.2 KiB
C++
/*
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Copyright (C) 2010 Paul Davis
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "pbd/stateful_diff_command.h"
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#include "pbd/property_list.h"
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#include "pbd/demangle.h"
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#include "i18n.h"
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using namespace std;
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using namespace PBD;
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/** Create a new StatefulDiffCommand by examining the changes made to a Stateful
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* since the last time that clear_changes was called on it.
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* @param s Stateful object.
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*/
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StatefulDiffCommand::StatefulDiffCommand (boost::shared_ptr<StatefulDestructible> s)
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: _object (s)
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, _changes (0)
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{
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_changes = s->get_changes_as_properties (this);
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/* if the stateful object that this command refers to goes away,
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be sure to notify owners of this command.
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*/
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s->DropReferences.connect_same_thread (*this, boost::bind (&Destructible::drop_references, this));
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}
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StatefulDiffCommand::StatefulDiffCommand (boost::shared_ptr<StatefulDestructible> s, XMLNode const & n)
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: _object (s)
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, _changes (0)
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{
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const XMLNodeList& children (n.children());
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for (XMLNodeList::const_iterator i = children.begin(); i != children.end(); ++i) {
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if ((*i)->name() == X_("Changes")) {
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_changes = s->property_factory (**i);
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}
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}
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assert (_changes != 0);
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/* if the stateful object that this command refers to goes away,
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be sure to notify owners of this command.
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*/
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s->DropReferences.connect_same_thread (*this, boost::bind (&Destructible::drop_references, this));
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}
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StatefulDiffCommand::~StatefulDiffCommand ()
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{
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drop_references ();
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delete _changes;
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}
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void
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StatefulDiffCommand::operator() ()
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{
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boost::shared_ptr<Stateful> s (_object.lock());
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if (s) {
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s->apply_changes (*_changes);
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}
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}
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void
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StatefulDiffCommand::undo ()
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{
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boost::shared_ptr<Stateful> s (_object.lock());
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if (s) {
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PropertyList p = *_changes;
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p.invert ();
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s->apply_changes (p);
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}
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}
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XMLNode&
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StatefulDiffCommand::get_state ()
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{
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boost::shared_ptr<Stateful> s (_object.lock());
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if (!s) {
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/* XXX should we throw? */
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return * new XMLNode("");
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}
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XMLNode* node = new XMLNode (X_("StatefulDiffCommand"));
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node->add_property ("obj-id", s->id().to_s());
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node->add_property ("type-name", demangled_name (*s.get()));
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XMLNode* changes = new XMLNode (X_("Changes"));
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_changes->get_changes_as_xml (changes);
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node->add_child_nocopy (*changes);
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return *node;
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}
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bool
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StatefulDiffCommand::empty () const
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{
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return _changes->empty();
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}
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