X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=lily%2Fstem-engraver.cc;h=fdb61219f6b7f635b78575ebc4f24237a6e22aa2;hb=5b4b0d6e9a197e8f9eb085b7c2ad78b8be3e5cfc;hp=797406b4fbc062d28aa0cc9af6f152d3435073ce;hpb=d4f38c4239f67dd08d616794a9cdc47a30a86b6a;p=lilypond.git

diff --git a/lily/stem-engraver.cc b/lily/stem-engraver.cc
index 797406b4fb..fdb61219f6 100644
--- a/lily/stem-engraver.cc
+++ b/lily/stem-engraver.cc
@@ -3,7 +3,7 @@
 
   source file of the GNU LilyPond music typesetter
 
-  (c) 1997--2006 Han-Wen Nienhuys <hanwen@xs4all.nl>
+  (c) 1997--2008 Han-Wen Nienhuys <hanwen@xs4all.nl>
 */
 
 #include "engraver.hh"
@@ -19,25 +19,25 @@
 #include "staff-symbol-referencer.hh"
 #include "stem-tremolo.hh"
 #include "stem.hh"
+#include "stream-event.hh"
+
+#include "translator.icc"
 
-/**
-   Make stems upon receiving noteheads.
-*/
 class Stem_engraver : public Engraver
 {
   Grob *stem_;
   Grob *tremolo_;
-  Music *rhythmic_ev_;
-  Music *tremolo_ev_;
+  Stream_event *rhythmic_ev_;
+  Stream_event *tremolo_ev_;
 
   TRANSLATOR_DECLARATIONS (Stem_engraver);
 
 protected:
   void make_stem (Grob_info);
 
+  DECLARE_TRANSLATOR_LISTENER (tremolo);
   DECLARE_ACKNOWLEDGER (rhythmic_head);
   void stop_translation_timestep ();
-  virtual bool try_music (Music *);
 };
 
 Stem_engraver::Stem_engraver ()
@@ -55,15 +55,6 @@ Stem_engraver::make_stem (Grob_info gi)
      stem needs a rhythmic structure to fit it into a beam.  */
   stem_ = make_item ("Stem", gi.grob ()->self_scm ());
 
-  /*
-    we take the duration log from the Event, since the duration-log
-    for a note head is always <= 2.
-  */
-  Music *music = gi.music_cause ();
-  Duration *dur = unsmob_duration (music->get_property ("duration"));
-
-  stem_->set_property ("duration-log", dur ? scm_from_int (dur->duration_log ()) : 0);
-
   if (tremolo_ev_)
     {
       /* Stem tremolo is never applied to a note by default,
@@ -86,6 +77,14 @@ Stem_engraver::make_stem (Grob_info gi)
       else
 	context ()->set_property ("tremoloFlags", scm_from_int (requested_type));
 
+
+      /*
+	we take the duration log from the Event, since the duration-log
+	for a note head is always <= 2.
+      */
+      Stream_event *ev = gi.event_cause ();
+      Duration *dur = unsmob_duration (ev->get_property ("duration"));
+      
       int tremolo_flags = intlog2 (requested_type) - 2
 	- (dur->duration_log () > 2 ? dur->duration_log () - 2 : 0);
       if (tremolo_flags <= 0)
@@ -114,7 +113,7 @@ Stem_engraver::acknowledge_rhythmic_head (Grob_info gi)
   if (Rhythmic_head::get_stem (gi.grob ()))
     return;
 
-  Music *cause = gi.music_cause ();
+  Stream_event *cause = gi.event_cause ();
   if (!cause)
     return;
   Duration *d = unsmob_duration (cause->get_property ("duration"));
@@ -127,9 +126,9 @@ Stem_engraver::acknowledge_rhythmic_head (Grob_info gi)
   if (Stem::duration_log (stem_) != d->duration_log ())
     {
       // FIXME: 
-      gi.music_cause ()->origin ()->warning (_f ("adding note head to incompatible stem (type = %d)",
+      gi.event_cause ()->origin ()->warning (_f ("adding note head to incompatible stem (type = %d)",
 						 1 << Stem::duration_log (stem_)));
-      gi.music_cause ()->origin ()->warning (_f ("maybe input should specify polyphonic voices"));
+      gi.event_cause ()->origin ()->warning (_ ("maybe input should specify polyphonic voices"));
     }
 
   Stem::add_head (stem_, gi.grob ());
@@ -159,30 +158,29 @@ Stem_engraver::stop_translation_timestep ()
   tremolo_ev_ = 0;
 }
 
-bool
-Stem_engraver::try_music (Music *m)
+IMPLEMENT_TRANSLATOR_LISTENER (Stem_engraver, tremolo);
+void
+Stem_engraver::listen_tremolo (Stream_event *ev)
 {
-  if (m->is_mus_type ("tremolo-event"))
-    {
-      tremolo_ev_ = m;
-      return true;
-    }
-  return false;
+  ASSIGN_EVENT_ONCE (tremolo_ev_, ev);
 }
 
-#include "translator.icc"
-
 ADD_ACKNOWLEDGER (Stem_engraver, rhythmic_head);
 
 ADD_TRANSLATOR (Stem_engraver,
-		/* doc */ "Create stems and single-stem tremolos.  It also works together with "
-		"the beam engraver for overriding beaming.",
+		/* doc */
+		"Create stems and single-stem tremolos.  It also works"
+		" together with the beam engraver for overriding beaming.",
+
 		/* create */
 		"Stem "
 		"StemTremolo ",
-		/* accept */ "tremolo-event",
+
 		/* read */
 		"tremoloFlags "
 		"stemLeftBeamCount "
 		"stemRightBeamCount ",
-		/* write */ "");
+
+		/* write */
+		""
+		);