2003 -> 2004

[lilypond.git] / lily / staff-symbol-engraver.cc

diff --git a/lily/staff-symbol-engraver.cc b/lily/staff-symbol-engraver.cc
index ea7300749a7113cd29ba9c77dd12331f85826bc9..d71dcb4f2121cb2543ce394258a8dd437b5f24a3 100644 (file)
--- a/lily/staff-symbol-engraver.cc
+++ b/lily/staff-symbol-engraver.cc
@@ -3,7 +3,7 @@
 
   source file of the GNU LilyPond music typesetter
 
-  (c)  1997--2003 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+  (c) 1997--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>
 */
 
 
@@ -26,7 +26,7 @@ protected:
   virtual ~Staff_symbol_engraver ();
   virtual void acknowledge_grob (Grob_info);
   virtual void finalize ();
-  virtual void initialize ();
+  virtual void process_music ();
 };
 
 
@@ -41,20 +41,26 @@ Staff_symbol_engraver::Staff_symbol_engraver ()
 }
 
 void
-Staff_symbol_engraver::initialize ()
+Staff_symbol_engraver::process_music ()
 {
-  span_ = new Spanner (get_property ("StaffSymbol"));
+  if (!span_)
+    {
+      span_ = make_spanner ("StaffSymbol");
   
-  span_->set_bound (LEFT, unsmob_grob (get_property ("currentCommandColumn")));
+      span_->set_bound (LEFT, unsmob_grob (get_property ("currentCommandColumn")));
 
-  announce_grob(span_, SCM_EOL);
+      announce_grob(span_, SCM_EOL);
+    }
 }
 
 void
 Staff_symbol_engraver::finalize ()
 {
-  span_->set_bound (RIGHT,unsmob_grob (get_property ("currentCommandColumn")));
-  typeset_grob (span_);
+  if (span_)
+    {
+      span_->set_bound (RIGHT,unsmob_grob (get_property ("currentCommandColumn")));
+      typeset_grob (span_);
+    }
   span_ =0;
 }