X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=lily%2Fmetronome-engraver.cc;h=26f1ec9b910d49f1b5ce240c210ee6fb1c4b040c;hb=49936ad4f64dacc337318c64265d97853f8404aa;hp=b59d3c962fb90b3ee2d1cc36beac2abaeaff9871;hpb=58bcc84c9480dae1b21bc24d8396b91fe19e0131;p=lilypond.git

diff --git a/lily/metronome-engraver.cc b/lily/metronome-engraver.cc
index b59d3c962f..26f1ec9b91 100644
--- a/lily/metronome-engraver.cc
+++ b/lily/metronome-engraver.cc
@@ -3,16 +3,21 @@
 
   source file of the GNU LilyPond music typesetter
 
-  (c) 1998--2005 Jan Nieuwenhuizen <janneke@gnu.org>
+  (c) 1998--2007 Jan Nieuwenhuizen <janneke@gnu.org>
 */
 
 #include <cctype>
+using namespace std;
+
+#include "engraver.hh"
 
-#include "note-column.hh"
-#include "bar-line.hh"
-#include "time-signature.hh"
-#include "engraver-group-engraver.hh"
 #include "context.hh"
+#include "duration.hh"
+#include "grob-array.hh"
+#include "item.hh"
+#include "stream-event.hh"
+
+#include "translator.icc"
 
 /**
    put stuff over or next to  bars.  Examples: bar numbers, marginal notes,
@@ -25,19 +30,28 @@ public:
 protected:
   Item *text_;
   Grob *bar_line_;
-  Music *mark_ev_;
 
-  void create_items (Music *);
+  SCM last_duration_;
+  SCM last_count_;
+  
 protected:
-  virtual void stop_translation_timestep ();
-  virtual bool try_music (Music *ev);
-  virtual void process_music ();
+  virtual void derived_mark () const;
+  void stop_translation_timestep ();
+  void process_music ();
 };
 
 Metronome_mark_engraver::Metronome_mark_engraver ()
 {
   text_ = 0;
-  mark_ev_ = 0;
+  last_duration_ = SCM_EOL;
+  last_count_ = SCM_EOL;
+}
+
+void
+Metronome_mark_engraver::derived_mark () const
+{
+  scm_gc_mark (last_count_);
+  scm_gc_mark (last_duration_);
 }
 
 void
@@ -47,53 +61,51 @@ Metronome_mark_engraver::stop_translation_timestep ()
     {
       Grob *mc = unsmob_grob (get_property ("currentMusicalColumn"));
       text_->set_parent (mc, X_AXIS);
-      text_->set_property ("side-support-elements", get_property ("stavesFound"));
-
+      text_->set_object ("side-support-elements",
+			 grob_list_to_grob_array (get_property ("stavesFound")));
       text_ = 0;
     }
-  mark_ev_ = 0;
-}
-
-void
-Metronome_mark_engraver::create_items (Music *rq)
-{
-  if (text_)
-    return;
-
-  text_ = make_item ("MetronomeMark", rq->self_scm ());
-
-}
-
-bool
-Metronome_mark_engraver::try_music (Music *r)
-{
-  mark_ev_ = r;
-  return true;
 }
 
 void
 Metronome_mark_engraver::process_music ()
 {
-  if (mark_ev_)
+  SCM count = get_property ("tempoUnitCount");
+  SCM duration = get_property ("tempoUnitDuration");
+  
+  if (unsmob_duration (duration)
+      && scm_is_number (count)
+      && !(ly_is_equal (count, last_count_)
+	   && ly_is_equal (duration, last_duration_)))
     {
-      create_items (mark_ev_);
+      text_ = make_item ("MetronomeMark", SCM_EOL);
 
       SCM proc = get_property ("metronomeMarkFormatter");
-      SCM result = scm_call_2 (proc, mark_ev_->self_scm (),
+      SCM result = scm_call_3 (proc,
+			       duration,
+			       count,
 			       context ()->self_scm ());
 
       text_->set_property ("text", result);
     }
+
+  last_duration_ = duration;
+  last_count_ = count;
 }
 
 ADD_TRANSLATOR (Metronome_mark_engraver,
-		/* descr */ "Engrave metro nome marking. This delegates the formatting work "
+		/* doc */ "Engrave metro nome marking. This delegates the formatting work "
 		"to the function in the metronomeMarkFormatter property. "
 		"The mark is put over all staves. "
 		"The staves are taken from the @code{stavesFound} property, "
 		"which is maintained by @code{@ref{Staff_collecting_engraver}}. ",
-		/* creats*/ "MetronomeMark",
-		/* accepts */ "metronome-change-event",
-		/* acks  */ "",
-		/* reads */ "stavesFound metronomeMarkFormatter",
+		/* create */ "MetronomeMark",
+
+		/* read */
+		"stavesFound "
+		"metronomeMarkFormatter "
+		"tempoUnitDuration "
+		"tempoUnitCount "
+		,
+
 		/* write */ "");