X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=lily%2Fextender-engraver.cc;h=53938b24f6eee350da9b7995cf14ce3b85f715a5;hb=daa44a9474e653d1cf4463b78871e33e9ff323a9;hp=6ec00234b76ae4d11b7b0677ec336ef29e57e857;hpb=e24df7c27635dc996c466295eacf2981bddccaf7;p=lilypond.git

diff --git a/lily/extender-engraver.cc b/lily/extender-engraver.cc
index 6ec00234b7..53938b24f6 100644
--- a/lily/extender-engraver.cc
+++ b/lily/extender-engraver.cc
@@ -2,25 +2,29 @@
   extender-engraver.cc -- implement Extender_engraver
 
   source file of the GNU LilyPond music typesetter
-  
-  (c) 1999--2005 Glen Prideaux <glenprideaux@iname.com>,
-                  Han-Wen Nienhuys <hanwen@cs.uu.nl>,
-                  Jan Nieuwenhuizen <janneke@gnu.org>
+
+  (c) 1999--2006 Glen Prideaux <glenprideaux@iname.com>,
+  Han-Wen Nienhuys <hanwen@xs4all.nl>,
+  Jan Nieuwenhuizen <janneke@gnu.org>
 */
 
 #include "context.hh"
 #include "engraver.hh"
-#include "group-interface.hh"
+#include "international.hh"
 #include "item.hh"
 #include "lyric-extender.hh"
 #include "note-head.hh"
+#include "pointer-group-interface.hh"
+#include "stream-event.hh"
 #include "warn.hh"
 
+#include "translator.icc"
+
 void completize_extender (Spanner *sp);
 
 class Extender_engraver : public Engraver
 {
-  Music *ev_;
+  Stream_event *ev_;
   Spanner *extender_;
   Spanner *pending_extender_;
 
@@ -28,14 +32,13 @@ public:
   TRANSLATOR_DECLARATIONS (Extender_engraver);
 
 protected:
-  virtual void acknowledge_grob (Grob_info);
+  DECLARE_TRANSLATOR_LISTENER (extender);
+  DECLARE_ACKNOWLEDGER (lyric_syllable);
   virtual void finalize ();
-  virtual bool try_music (Music*);
-  virtual void stop_translation_timestep ();
-  virtual void process_music ();
+  void stop_translation_timestep ();
+  void process_music ();
 };
 
-
 Extender_engraver::Extender_engraver ()
 {
   extender_ = 0;
@@ -43,15 +46,11 @@ Extender_engraver::Extender_engraver ()
   ev_ = 0;
 }
 
-bool
-Extender_engraver::try_music (Music *r)
+IMPLEMENT_TRANSLATOR_LISTENER (Extender_engraver, extender);
+void
+Extender_engraver::listen_extender (Stream_event *ev)
 {
-  if (!ev_)
-    {
-      ev_ = r;
-      return true;
-    }
-  return false;
+  ASSIGN_EVENT_ONCE (ev_, ev);
 }
 
 void
@@ -62,22 +61,17 @@ Extender_engraver::process_music ()
 }
 
 void
-Extender_engraver::acknowledge_grob (Grob_info i)
+Extender_engraver::acknowledge_lyric_syllable (Grob_info i)
 {
-  Item *item = dynamic_cast<Item*> (i.grob_);
+  Item *item = i.item ();
+  if (extender_)
+    extender_->set_bound (LEFT, item);
 
-  if (item
-      && item->internal_has_interface (ly_symbol2scm ("lyric-syllable-interface")))
+  if (pending_extender_)
     {
-      if (extender_)
-	extender_->set_bound (LEFT, item);
-
-      if (pending_extender_)
-	{
-	  pending_extender_->set_property ("next", item->self_scm ());
-	  completize_extender (pending_extender_);
-	  pending_extender_ = 0;
-	}
+      pending_extender_->set_object ("next", item->self_scm ());
+      completize_extender (pending_extender_);
+      pending_extender_ = 0;
     }
 }
 
@@ -96,14 +90,14 @@ Extender_engraver::stop_translation_timestep ()
 	      Pointer_group_interface::add_grob (extender_,
 						 ly_symbol2scm ("heads"), h);
 	    }
-	  
+
 	  if (pending_extender_)
 	    {
 	      Pointer_group_interface::add_grob (pending_extender_,
 						 ly_symbol2scm ("heads"), h);
 	    }
 	}
-      
+
       if (extender_)
 	{
 	  pending_extender_ = extender_;
@@ -119,13 +113,9 @@ completize_extender (Spanner *sp)
 {
   if (!sp->get_bound (RIGHT))
     {
-      SCM heads = sp->get_property ("heads");
-      if (scm_is_pair (heads))
-	{
-	  Item *it = dynamic_cast<Item*> (unsmob_grob (scm_car (heads)));
-	  if (it)
-	    sp->set_bound (RIGHT, it);
-	}
+      extract_item_set (sp, "heads", heads);
+      if (heads.size ())
+	sp->set_bound (RIGHT, heads.back ());
     }
 }
 
@@ -151,11 +141,10 @@ Extender_engraver::finalize ()
     }
 }
 
-
+ADD_ACKNOWLEDGER (Extender_engraver, lyric_syllable);
 ADD_TRANSLATOR (Extender_engraver,
-/* descr */       "Create lyric extenders",
-/* creats*/       "LyricExtender",
-/* accepts */     "extender-event",
-/* acks  */       "lyric-syllable-interface",
-/* reads */       "",
-/* write */       "");
+		/* doc */ "Create lyric extenders",
+		/* create */ "LyricExtender",
+		/* accept */ "extender-event",
+		/* read */ "",
+		/* write */ "");