X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;ds=sidebyside;f=lily%2Fstaff-symbol-engraver.cc;h=4eee00b116dd8f0377dd3a7aa7a5784314714842;hb=aade5eaab9ddc9b948db6edbb0d43a6f4a691fda;hp=b12d73b3ae7f5eaf67a5062f4430de35972a21d6;hpb=d9b43b93f2c885409bafdb157138158f65cc49aa;p=lilypond.git

diff --git a/lily/staff-symbol-engraver.cc b/lily/staff-symbol-engraver.cc
index b12d73b3ae..4eee00b116 100644
--- a/lily/staff-symbol-engraver.cc
+++ b/lily/staff-symbol-engraver.cc
@@ -3,77 +3,117 @@
 
   source file of the GNU LilyPond music typesetter
 
-  (c)  1997--2002 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+  (c) 1997--2006 Han-Wen Nienhuys <hanwen@xs4all.nl>
 */
 
-
-#include "score.hh"
-#include "paper-column.hh"
-#include "paper-def.hh"
-#include "side-position-interface.hh"
-#include "engraver.hh"
-#include "moment.hh"
-
-/**
-  Manage the staff symbol.
- */
-class Staff_symbol_engraver : public Engraver { 
-  Spanner *span_p_;
-public:
-  TRANSLATOR_DECLARATIONS(Staff_symbol_engraver);
-  
-protected:
-  virtual ~Staff_symbol_engraver ();
-  virtual void acknowledge_grob (Grob_info);
-  virtual void finalize ();
-  virtual void initialize ();
-};
-
+#include "staff-symbol-engraver.hh"
+#include "spanner.hh"
 
 Staff_symbol_engraver::~Staff_symbol_engraver ()
 {
-  assert (!span_p_);
+  assert (!span_);
 }
 
 Staff_symbol_engraver::Staff_symbol_engraver ()
 {
-  span_p_ = 0;
+  finished_span_ = 0;
+  first_start_ = true;
+  span_ = 0;
+  span_events_[LEFT] = 0;
+  span_events_[RIGHT] = 0;
 }
 
-void
-Staff_symbol_engraver::initialize ()
+bool
+Staff_symbol_engraver::try_music (Music *music)
 {
-  span_p_ = new Spanner (get_property ("StaffSymbol"));
-  
-  span_p_->set_bound (LEFT, unsmob_grob (get_property ("currentCommandColumn")));
-
-  announce_grob (span_p_, 0);
+  Direction d = to_dir (music->get_property ("span-direction"));
+  if (d)
+    {
+      span_events_[d] = music;
+      return true;
+    }
+
+  return false;
 }
 
 void
-Staff_symbol_engraver::finalize ()
+Staff_symbol_engraver::process_music ()
 {
-  span_p_->set_bound (RIGHT,unsmob_grob (get_property ("currentCommandColumn")));
-  typeset_grob (span_p_);
-  span_p_ =0;
+  if (span_events_[STOP])
+    {
+      finished_span_ = span_;
+      span_ = 0;
+      if (first_start_)
+	first_start_ = false;
+    }
+
+  if (span_events_[START]
+      || (first_start_ && !span_events_[STOP]))
+    start_spanner ();
 }
 
 void
-Staff_symbol_engraver::acknowledge_grob (Grob_info s)
+Staff_symbol_engraver::start_spanner ()
 {
-  s.grob_l_->set_grob_property ("staff-symbol", span_p_->self_scm ());
+  if (!span_)
+    span_ = make_spanner ("StaffSymbol", SCM_EOL);
+}
 
-  // remove this. probly not necessary?
-  s.grob_l_->add_dependency (span_p_); // UGH. UGH. UGH
+void
+Staff_symbol_engraver::stop_spanner ()
+{
+  if (finished_span_ && !finished_span_->get_bound (RIGHT))
+    finished_span_->set_bound (RIGHT, unsmob_grob (get_property ("currentCommandColumn")));
+  finished_span_ = 0;
 }
 
+void
+Staff_symbol_engraver::stop_translation_timestep ()
+{
+  if ((span_events_[START] || first_start_)
+      && span_
+      && !span_->get_bound (LEFT))
+    {
+      span_->set_bound (LEFT, unsmob_grob (get_property ("currentCommandColumn")));
+      first_start_ = false;
+    }
+
+  span_events_[START] = 0;
+  span_events_[STOP] = 0;
+  stop_spanner ();
+}
 
+void
+Staff_symbol_engraver::finalize ()
+{
+  finished_span_ = span_;
+  span_ = 0;
+  stop_spanner ();
+}
 
+/*
+  Todo: staff-symbol-referencer iface.
+*/
+void
+Staff_symbol_engraver::acknowledge_grob (Grob_info s)
+{
+  /*
+    Perhaps should try to take SeparationItem as bound of the staff
+    symbol?
+  */
+  if (span_ || finished_span_)
+    {
+      Spanner *my = span_ ? span_ : finished_span_;
+      s.grob ()->set_object ("staff-symbol", my->self_scm ());
+    }
+}
 
-ENTER_DESCRIPTION(Staff_symbol_engraver,
-/* descr */       "create the constellation of five (default)
-staff lines.",
-/* creats*/       "StaffSymbol",
-/* acks  */       "grob-interface",
-/* reads */       "",
-/* write */       "");
+#include "translator.icc"
+ADD_ACKNOWLEDGER (Staff_symbol_engraver, grob);
+ADD_TRANSLATOR (Staff_symbol_engraver,
+		/* doc */ "Create the constellation of five (default) "
+		"staff lines.",
+		/* create */ "StaffSymbol",
+		/* accept */ "staff-span-event",
+		/* read */ "",
+		/* write */ "");