Consolidate RegionsPropertyChanged signal emission (1/3)

This prepares to combine multiple RegionPropertyChanged signals
(potentially thousands) into a single signal.

libs/ardour/ardour/region.h

@@ -101,6 +101,10 @@ public:
 
 	static PBD::Signal2<void,boost::shared_ptr<ARDOUR::Region>, const PBD::PropertyChange&> RegionPropertyChanged;
 
+	static PBD::Signal2<void,boost::shared_ptr<RegionList>, const PBD::PropertyChange&> RegionsPropertyChanged;
+
+	typedef std::map <PBD::PropertyChange, RegionList> ChangeMap;
+
 	virtual ~Region();
 
 	/** Note: changing the name of a Region does not constitute an edit */
@@ -366,6 +370,11 @@ public:
 
 	void drop_sources ();
 
+	/* Allow to collect RegionsPropertyChanged signal emissions */
+	void set_changemap (ChangeMap* changemap) {
+		_changemap = changemap;
+	}
+
 protected:
 	virtual XMLNode& state ();
 
@@ -478,6 +487,8 @@ private:
 	mutable RegionEditState _first_edit;
 	layer_t                 _layer;
 
+	ChangeMap* _changemap;
+
 	void register_properties ();
 
 	void use_sources (SourceList const &);

libs/ardour/playlist.cc

@@ -620,11 +620,16 @@ Playlist::flush_notifications (bool from_undo)
 		crossfade_ranges.push_back ((*r)->range ());
 	}
 
+	boost::shared_ptr<RegionList> rl (new RegionList);
 	for (s = pending_removes.begin (); s != pending_removes.end (); ++s) {
 		crossfade_ranges.push_back ((*s)->range ());
 		remove_dependents (*s);
 		RegionRemoved (boost::weak_ptr<Region> (*s)); /* EMIT SIGNAL */
-		Region::RegionPropertyChanged (*s, Properties::hidden);
+		rl->push_back (*s);
+		Region::RegionPropertyChanged (*s, Properties::hidden); // XXX remove me
+	}
+	if (rl->size () > 0) {
+		Region::RegionsPropertyChanged (rl, Properties::hidden);
 	}
 
 	for (s = pending_adds.begin (); s != pending_adds.end (); ++s) {

libs/ardour/region.cc

@@ -87,6 +87,7 @@ namespace ARDOUR {
 }
 
 PBD::Signal2<void,boost::shared_ptr<ARDOUR::Region>,const PropertyChange&> Region::RegionPropertyChanged;
+PBD::Signal2<void,boost::shared_ptr<ARDOUR::RegionList>,const PropertyChange&> Region::RegionsPropertyChanged;
 
 void
 Region::make_property_quarks ()
@@ -262,6 +263,7 @@ Region::Region (Session& s, samplepos_t start, samplecnt_t length, const string&
 	, _last_position (0)
 	, _first_edit (EditChangesNothing)
 	, _layer (0)
+	, _changemap (0)
 {
 	register_properties ();
 
@@ -277,6 +279,7 @@ Region::Region (const SourceList& srcs)
 	, _last_position (0)
 	, _first_edit (EditChangesNothing)
 	, _layer (0)
+	, _changemap (0)
 {
 	register_properties ();
 
@@ -297,6 +300,7 @@ Region::Region (boost::shared_ptr<const Region> other)
 	, _last_position(other->_last_position) \
 	, _first_edit (EditChangesNothing)
 	, _layer (other->_layer)
+	, _changemap (other->_changemap)
 {
 	register_properties ();
 
@@ -359,6 +363,7 @@ Region::Region (boost::shared_ptr<const Region> other, MusicSample offset)
 	, _last_position(other->_last_position) \
 	, _first_edit (EditChangesNothing)
 	, _layer (other->_layer)
+	, _changemap (other->_changemap)
 {
 	register_properties ();
 
@@ -415,6 +420,7 @@ Region::Region (boost::shared_ptr<const Region> other, const SourceList& srcs)
 	, _last_position (other->_last_position)
 	, _first_edit (EditChangesID)
 	, _layer (other->_layer)
+	, _changemap (other->_changemap)
 {
 	register_properties ();
 
@@ -1490,12 +1496,20 @@ Region::send_change (const PropertyChange& what_changed)
 	if (!Stateful::property_changes_suspended()) {
 
 		/* Try and send a shared_pointer unless this is part of the constructor.
-		   If so, do nothing.
-		*/
+		 * If so, do nothing.
+		 */
 
 		try {
 			boost::shared_ptr<Region> rptr = shared_from_this();
-			RegionPropertyChanged (rptr, what_changed);
+			if (_changemap) { 
+				(*_changemap)[what_changed].push_back (rptr);
+			} else {
+				boost::shared_ptr<RegionList> rl (new RegionList);
+				rl->push_back (rptr);
+				RegionsPropertyChanged (rl, what_changed);
+
+				RegionPropertyChanged (rptr, what_changed); // XXX remove me
+			}
 		} catch (...) {
 			/* no shared_ptr available, relax; */
 		}

libs/ardour/thawlist.cc

@@ -42,8 +42,16 @@ ThawList::add (boost::shared_ptr<Region> r)
 void
 ThawList::release ()
 {
+	Region::ChangeMap cm;
 	for (RegionList::iterator i = begin (); i != end (); ++i) {
+		(*i)->set_changemap (&cm);
 		(*i)->resume_property_changes ();
+		(*i)->set_changemap (0);
+	}
+	for (Region::ChangeMap::const_iterator i = cm.begin (); i != cm.end (); ++i) {
+		boost::shared_ptr<RegionList> rl (new RegionList (i->second));
+		assert (rl->size () > 0);
+		Region::RegionsPropertyChanged (rl, i->first);
 	}
 	clear ();
 }

libs/ardour/track.cc

@@ -662,7 +662,7 @@ Track::find_and_use_playlist (DataType dt, PBD::ID const & id)
 void
 update_region_visibility(boost::shared_ptr<Region> r)
 {
-	Region::RegionPropertyChanged(r, Properties::hidden);
+	Region::RegionPropertyChanged(r, Properties::hidden); // XXX remove me
 }
 
 
@@ -683,9 +683,20 @@ Track::use_playlist (DataType dt, boost::shared_ptr<Playlist> p)
 		_playlists[dt] = p;
 	}
 
-	//allow all regions of prior and new playlists to update their visibility?
-	if (old)  old->foreach_region(update_region_visibility);
-	if (p)    p->foreach_region(update_region_visibility);
+	if (old) {
+		boost::shared_ptr<RegionList> rl (new RegionList (old->region_list_property ().rlist ()));
+		if (rl->size () > 0) {
+			Region::RegionsPropertyChanged (rl, Properties::hidden);
+		}
+		old->foreach_region(update_region_visibility); // XXX remove me
+	}
+	if (p) {
+		boost::shared_ptr<RegionList> rl (new RegionList (p->region_list_property ().rlist ()));
+		if (rl->size () > 0) {
+			Region::RegionsPropertyChanged (rl, Properties::hidden);
+		}
+		p->foreach_region(update_region_visibility); // XXX remove me
+	}
 
 	_session.set_dirty ();
 	PlaylistChanged (); /* EMIT SIGNAL */