Save and not-yet-working restore of StatefulDiffCommands.

git-svn-id: svn://localhost/ardour2/branches/3.0@6669 d708f5d6-7413-0410-9779-e7cbd77b26cf

1 files changed, 16 insertions, 1 deletions

diff --git a/libs/pbd/stateful_diff_command.cc b/libs/pbd/stateful_diff_command.cc
index 788a5be034..1332cae4ff 100644
--- a/libs/pbd/stateful_diff_command.cc
+++ b/libs/pbd/stateful_diff_command.cc
@@ -18,6 +18,7 @@
 */
 
 #include "pbd/stateful_diff_command.h"
+#include "i18n.h"
 
 using namespace std;
 using namespace PBD;
@@ -35,6 +36,13 @@ StatefulDiffCommand::StatefulDiffCommand (Stateful* s)
 	_after = p.second;
 }
 
+StatefulDiffCommand::StatefulDiffCommand (Stateful* s, XMLNode const & n)
+	: _object (s)
+{
+	_before = new XMLNode (*n.children().front());
+	_after = new XMLNode (*n.children().back());
+}
+
 
 StatefulDiffCommand::~StatefulDiffCommand ()
 {
@@ -57,5 +65,12 @@ StatefulDiffCommand::undo ()
 XMLNode&
 StatefulDiffCommand::get_state ()
 {
-	/* XXX */
+	XMLNode* node = new XMLNode (X_("StatefulDiffCommand"));
+
+	node->add_property ("obj-id", _object->id().to_s());
+	node->add_property ("type-name", typeid(*_object).name());
+	node->add_child_copy (*_before);
+	node->add_child_copy (*_after);
+
+	return *node;
 }