From 12b9571b8007238a365324238e42721ab994853f Mon Sep 17 00:00:00 2001
From: Carl Hetherington <carl@carlh.net>
Date: Tue, 9 Feb 2010 22:28:46 +0000
Subject: Save and not-yet-working restore of StatefulDiffCommands.

git-svn-id: svn://localhost/ardour2/branches/3.0@6669 d708f5d6-7413-0410-9779-e7cbd77b26cf
---
 libs/ardour/ardour/session.h         |  1 +
 libs/ardour/session_command.cc       | 19 +++++++++++++++++++
 libs/ardour/session_state.cc         |  4 ++++
 libs/pbd/pbd/stateful_diff_command.h |  3 ++-
 libs/pbd/stateful_diff_command.cc    | 17 ++++++++++++++++-
 5 files changed, 42 insertions(+), 2 deletions(-)

diff --git a/libs/ardour/ardour/session.h b/libs/ardour/ardour/session.h
index de2dbaa149..f0b71d8019 100644
--- a/libs/ardour/ardour/session.h
+++ b/libs/ardour/ardour/session.h
@@ -728,6 +728,7 @@ class Session : public PBD::StatefulDestructible, public PBD::ScopedConnectionLi
 
 	// these commands are implemented in libs/ardour/session_command.cc
 	Command* memento_command_factory(XMLNode* n);
+	Command* stateful_diff_command_factory (XMLNode *);
 	void register_with_memento_command_factory(PBD::ID, PBD::StatefulDestructible*);
 
 	/* clicking */
diff --git a/libs/ardour/session_command.cc b/libs/ardour/session_command.cc
index 19253cc725..897359b274 100644
--- a/libs/ardour/session_command.cc
+++ b/libs/ardour/session_command.cc
@@ -36,6 +36,7 @@
 #include "pbd/id.h"
 #include "pbd/statefuldestructible.h"
 #include "pbd/failed_constructor.h"
+#include "pbd/stateful_diff_command.h"
 #include "evoral/Curve.hpp"
 
 using namespace PBD;
@@ -132,3 +133,21 @@ Session::memento_command_factory(XMLNode *n)
     return 0 ;
 }
 
+Command *
+Session::stateful_diff_command_factory (XMLNode* n)
+{
+	PBD::ID const id (n->property("obj-id")->value ());
+
+	string const obj_T = n->property ("type-name")->value ();
+	if ((obj_T == typeid (AudioRegion).name() || obj_T == typeid (MidiRegion).name()) && regions.count(id)) {
+		return new StatefulDiffCommand (regions[id].get(), *n);
+	}
+
+	/* we failed */
+	
+	error << string_compose (
+		_("could not reconstitute StatefulDiffCommand from XMLNode. object type = %1 id = %2"), obj_T, id.to_s())
+	      << endmsg;
+	
+	return 0;
+}
diff --git a/libs/ardour/session_state.cc b/libs/ardour/session_state.cc
index fd14094f7f..45e35c91fd 100644
--- a/libs/ardour/session_state.cc
+++ b/libs/ardour/session_state.cc
@@ -2955,6 +2955,10 @@ Session::restore_history (string snapshot_name)
 					error << string_compose (_("Region command references an unknown region ID=%1"), id.to_s()) << endmsg;
 				}
 
+			} else if (n->name() == "StatefulDiffCommand") {
+				if ((c = stateful_diff_command_factory (n))) {
+					ut->add_command (c);
+				}
 			} else {
 				error << string_compose(_("Couldn't figure out how to make a Command out of a %1 XMLNode."), n->name()) << endmsg;
 			}
diff --git a/libs/pbd/pbd/stateful_diff_command.h b/libs/pbd/pbd/stateful_diff_command.h
index b02d7a669e..41c0c70f69 100644
--- a/libs/pbd/pbd/stateful_diff_command.h
+++ b/libs/pbd/pbd/stateful_diff_command.h
@@ -30,7 +30,8 @@ class Stateful;
 class StatefulDiffCommand : public Command
 {
 public:
-	StatefulDiffCommand (Stateful* s);
+	StatefulDiffCommand (Stateful *);
+	StatefulDiffCommand (Stateful *, XMLNode const &);
 	~StatefulDiffCommand ();
 
 	void operator() ();
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;
 }
-- 
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