Fix restoration of MementoCommand<Crossfade>. Fixes #3418.

git-svn-id: svn://localhost/ardour2/branches/3.0@7771 d708f5d6-7413-0410-9779-e7cbd77b26cf

libs/ardour/ardour/audioplaylist.h

@@ -91,6 +91,8 @@ public:
 
 	void update (const CrossfadeListProperty::ChangeRecord &);
 
+	boost::shared_ptr<Crossfade> find_crossfade (const PBD::ID &) const;
+	
     protected:
 
 	/* playlist "callbacks" */

libs/ardour/ardour/playlist.h

@@ -50,6 +50,7 @@ namespace ARDOUR  {
 class Session;
 class Region;
 class Playlist;
+class Crossfade;	
 
 namespace Properties {
         /* fake the type, since regions are handled by SequenceProperty which doesn't
@@ -210,6 +211,10 @@ public:
 
 	void set_explicit_relayering (bool e);
 
+	virtual boost::shared_ptr<Crossfade> find_crossfade (const PBD::ID &) const {
+		return boost::shared_ptr<Crossfade> ();
+	}
+
   protected:
 	friend class Session;
 

libs/ardour/ardour/session_playlists.h

@@ -41,6 +41,7 @@ class Playlist;
 class Region;
 class Source;
 class Session;
+class Crossfade;	
 	
 class SessionPlaylists : public PBD::ScopedConnectionList
 {
@@ -54,6 +55,7 @@ public:
 	void get (std::vector<boost::shared_ptr<Playlist> >&);
 	void unassigned (std::list<boost::shared_ptr<Playlist> > & list);
         void destroy_region (boost::shared_ptr<Region>);
+	boost::shared_ptr<Crossfade> find_crossfade (const PBD::ID &);
 
 private:
 	friend class Session;

libs/ardour/audio_playlist.cc

@@ -875,3 +875,18 @@ AudioPlaylist::update (const CrossfadeListProperty::ChangeRecord& change)
 
 	/* don't remove crossfades here; they will be dealt with by the dependency code */
 }
+
+boost::shared_ptr<Crossfade>
+AudioPlaylist::find_crossfade (const PBD::ID& id) const
+{
+	Crossfades::const_iterator i = _crossfades.begin ();
+	while (i != _crossfades.end() && (*i)->id() != id) {
+		++i;
+	}
+
+	if (i == _crossfades.end()) {
+		return boost::shared_ptr<Crossfade> ();
+	}
+
+	return *i;
+}

libs/ardour/crossfade.cc

@@ -717,6 +717,8 @@ Crossfade::get_state ()
 	char buf[64];
 	LocaleGuard lg (X_("POSIX"));
 
+	id().print (buf, sizeof (buf));
+	node->add_property ("id", buf);
 	_out->id().print (buf, sizeof (buf));
 	node->add_property ("out", buf);
 	_in->id().print (buf, sizeof (buf));
@@ -774,6 +776,10 @@ Crossfade::set_state (const XMLNode& node, int /*version*/)
 	PropertyChange what_changed;
 	framepos_t val;
 
+	if ((prop = node.property (X_("id")))) {
+		_id = prop->value();
+	}
+
 	if ((prop = node.property ("position")) != 0) {
 		sscanf (prop->value().c_str(), "%" PRId64, &val);
 		if (val != _position) {

libs/ardour/session_command.cc

@@ -34,6 +34,7 @@
 #include "ardour/session_playlists.h"
 #include "ardour/region_factory.h"
 #include "ardour/midi_automation_list_binder.h"
+#include "ardour/crossfade.h"
 #include "pbd/error.h"
 #include "pbd/id.h"
 #include "pbd/statefuldestructible.h"
@@ -140,7 +141,15 @@ Session::memento_command_factory(XMLNode *n)
 	    }
 	    
 	    cerr << "Alist not found\n";
-	    
+
+    } else if (obj_T == "ARDOUR::Crossfade") {
+	    boost::shared_ptr<Crossfade> c = playlists->find_crossfade (id);
+	    if (c) {
+		    return new MementoCommand<Crossfade> (*c.get(), before, after);
+	    } else {
+		    error << string_compose (X_("Crossfade %1 not found in session"), id) << endmsg;
+	    }
+
     } else if (registry.count(id)) { // For Editor and AutomationLine which are off-limits herea
 	    return new MementoCommand<PBD::StatefulDestructible>(*registry[id], before, after);
     }

libs/ardour/session_playlists.cc

@@ -390,3 +390,26 @@ SessionPlaylists::XMLPlaylistFactory (Session& session, const XMLNode& node)
 	}
 }
 
+boost::shared_ptr<Crossfade>
+SessionPlaylists::find_crossfade (const PBD::ID& id)
+{
+	Glib::Mutex::Lock lm (lock);
+
+	boost::shared_ptr<Crossfade> c;
+	
+	for (List::iterator i = playlists.begin(); i != playlists.end(); ++i) {
+		c = (*i)->find_crossfade (id);
+		if (c) {
+			return c;
+		}
+	}
+
+	for (List::iterator i = unused_playlists.begin(); i != unused_playlists.end(); ++i) {
+		c = (*i)->find_crossfade (id);
+		if (c) {
+			return c;
+		}
+	}
+
+	return boost::shared_ptr<Crossfade> ();
+}