X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=lily%2Fstaff-symbol-engraver.cc;h=12bdfe24461670abf2fee90ac18e109646e11f18;hb=5b4b0d6e9a197e8f9eb085b7c2ad78b8be3e5cfc;hp=c1a27bcd1794dffe379e5a1bfb5d2781c1b4b353;hpb=fc3e875d6bf06f0680e897faffdcab36ad975a03;p=lilypond.git

diff --git a/lily/staff-symbol-engraver.cc b/lily/staff-symbol-engraver.cc
index c1a27bcd17..12bdfe2446 100644
--- a/lily/staff-symbol-engraver.cc
+++ b/lily/staff-symbol-engraver.cc
@@ -3,71 +3,160 @@
 
   source file of the GNU LilyPond music typesetter
 
-  (c)  1997--2001 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+  (c) 1997--2008 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"
+#include "international.hh"
+#include "spanner.hh"
+#include "stream-event.hh"
+#include "warn.hh"
+
+#include "translator.icc"
 
-/**
-  Manage the staff symbol.
- */
-class Staff_symbol_engraver : public Engraver { 
-  Spanner *span_p_;
+class Staff_symbol_engraver : public Engraver
+{
 public:
-  VIRTUAL_COPY_CONS (Translator);
-  Staff_symbol_engraver ();
-  
+  TRANSLATOR_DECLARATIONS (Staff_symbol_engraver);
+
+protected:
+  Drul_array<Stream_event *> span_events_;
+  Spanner *span_;
+  Spanner *finished_span_;
+  bool first_start_;
+
 protected:
+  virtual void start_spanner ();
+  virtual void stop_spanner ();
+
+  void stop_translation_timestep ();
   virtual ~Staff_symbol_engraver ();
-  virtual void acknowledge_grob (Grob_info);
+  DECLARE_ACKNOWLEDGER (grob);
+  DECLARE_TRANSLATOR_LISTENER (staff_span);
   virtual void finalize ();
-  virtual void initialize ();
+  void process_music ();
 };
 
-
 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;
+}
+
+IMPLEMENT_TRANSLATOR_LISTENER (Staff_symbol_engraver, staff_span);
+void
+Staff_symbol_engraver::listen_staff_span (Stream_event *ev)
+{
+  Direction d = to_dir (ev->get_property ("span-direction"));
+  if (d)
+    ASSIGN_EVENT_ONCE (span_events_[d], ev);
+  else
+    programming_error (_ ("staff-span event has no direction"));
 }
 
 void
-Staff_symbol_engraver::initialize ()
+Staff_symbol_engraver::process_music ()
 {
-  span_p_ = new Spanner (get_property ("StaffSymbol"));
+  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::start_spanner ()
+{
+  if (!span_)
+    {
+      span_ = make_spanner ("StaffSymbol", SCM_EOL);
+      span_->set_bound (LEFT,
+			unsmob_grob (get_property ("currentCommandColumn")));
+    }
+}
+
+void
+Staff_symbol_engraver::stop_spanner ()
+{
+  if (!finished_span_)
+    return;
+
+  if (!finished_span_->get_bound (RIGHT))
+    finished_span_->set_bound (RIGHT, unsmob_grob (get_property ("currentCommandColumn")));
   
-  span_p_->set_bound (LEFT, unsmob_grob (get_property ("currentCommandColumn")));
+  announce_end_grob (finished_span_,
+		     span_events_[STOP]
+		     ? span_events_[STOP]->self_scm ()
+		     : SCM_EOL);
+  
+  finished_span_ = 0;
+}
 
-  announce_grob (span_p_, 0);
+void
+Staff_symbol_engraver::stop_translation_timestep ()
+{
+  if ((span_events_[START] || first_start_)
+      && span_)
+    {
+      first_start_ = false;
+    }
+
+  span_events_[START] = 0;
+  span_events_[STOP] = 0;
+  stop_spanner ();
 }
 
 void
 Staff_symbol_engraver::finalize ()
 {
-  span_p_->set_bound (RIGHT,unsmob_grob (get_property ("currentCommandColumn")));
-  typeset_grob (span_p_);
-  span_p_ =0;
+  finished_span_ = span_;
+  span_ = 0;
+  stop_spanner ();
 }
 
+/*
+  Todo: staff-symbol-referencer iface.
+*/
 void
 Staff_symbol_engraver::acknowledge_grob (Grob_info s)
 {
-  s.elem_l_->set_grob_property ("staff-symbol", span_p_->self_scm ());
-
-  // remove this. probly not necessary?
-  s.elem_l_->add_dependency (span_p_); // UGH. UGH. UGH
+  /*
+    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 ());
+    }
 }
 
+ADD_ACKNOWLEDGER (Staff_symbol_engraver, grob);
+
+ADD_TRANSLATOR (Staff_symbol_engraver,
+		/* doc */
+		"Create the constellation of five (default) staff lines.",
+
+		/* create */
+		"StaffSymbol ",
 
-ADD_THIS_TRANSLATOR (Staff_symbol_engraver);
+		/* read */
+		"",
 
+		/* write */
+		""
+		);