X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=lily%2Fledger-line-engraver.cc;h=fe769b70bb429fd62f2cbbecc2f4a8ba200e5b87;hb=5ea982187f9aebfe588225813be14c48020452f3;hp=70775c40bbbf2a4ee34e2064c38c16e3662d9edc;hpb=b34c63f0e1afe6b1312c4c167b1cad312acd1b00;p=lilypond.git

diff --git a/lily/ledger-line-engraver.cc b/lily/ledger-line-engraver.cc
index 70775c40bb..fe769b70bb 100644
--- a/lily/ledger-line-engraver.cc
+++ b/lily/ledger-line-engraver.cc
@@ -1,65 +1,128 @@
-/* 
-  ledger-line-engraver.cc --  implement Ledger_line_engraver=
-  
+/*
+  ledger-line-engraver.cc -- implement Ledger_line_engraver
+
   source file of the GNU LilyPond music typesetter
-  
-  (c) 2004 Han-Wen Nienhuys <hanwen@xs4all.nl>
-  
-*/
 
+  (c) 2004--2008 Han-Wen Nienhuys <hanwen@xs4all.nl>
+*/
 
-#include "group-interface.hh"
+#include "pointer-group-interface.hh"
 #include "spanner.hh"
 #include "engraver.hh"
+#include "staff-symbol.hh"
 
 class Ledger_line_engraver : public Engraver
 {
-  Spanner * span_;
-
+  Spanner *span_;
+  vector<Grob*> ledgered_grobs_;
+  
 public:
   TRANSLATOR_DECLARATIONS (Ledger_line_engraver);
 
 protected:
   virtual void finalize ();
-  virtual void process_music ();
-  virtual void acknowledge_grob (Grob_info);
+  void process_music ();
+
+  DECLARE_ACKNOWLEDGER (ledgered);
+  DECLARE_ACKNOWLEDGER (staff_symbol);
+
+  void start_spanner ();
+  void stop_spanner ();
+  void stop_translation_timestep ();
 };
 
-Ledger_line_engraver::Ledger_line_engraver()
+Ledger_line_engraver::Ledger_line_engraver ()
 {
   span_ = 0;
 }
 
 void
-Ledger_line_engraver::process_music ()
+Ledger_line_engraver::start_spanner ()
 {
-  if (!span_)
+  assert (!span_);
+
+  span_ = make_spanner ("LedgerLineSpanner", SCM_EOL);
+  span_->set_bound (LEFT, unsmob_grob (get_property ("currentCommandColumn")));
+}
+
+void
+Ledger_line_engraver::stop_translation_timestep ()
+{
+  if (span_)
     {
-      span_ = make_spanner("LedgerLineSpanner", SCM_EOL);
-  
-      span_->set_bound (LEFT, unsmob_grob (get_property ("currentCommandColumn")));
+      for (vsize i = 0; i < ledgered_grobs_.size (); i++)
+	{
+	  if (!to_boolean (ledgered_grobs_[i]->get_property ("no-ledgers")))
+	    Pointer_group_interface::add_grob (span_,
+					       ly_symbol2scm ("note-heads"),
+					       ledgered_grobs_[i]);
+	}
     }
+
+  ledgered_grobs_.clear ();
+}
+
+void
+Ledger_line_engraver::process_music ()
+{
+  /*
+    Need to do this, otherwise the first note might miss ledgers. 
+  */
+  if (!span_)
+    start_spanner ();
 }
 
 void
 Ledger_line_engraver::finalize ()
+{
+  stop_spanner ();
+}
+
+void
+Ledger_line_engraver::stop_spanner ()
 {
   if (span_)
-    span_->set_bound (RIGHT,unsmob_grob (get_property ("currentCommandColumn")));
+    {
+      span_->set_bound (RIGHT, unsmob_grob (get_property ("currentCommandColumn")));
+      Pointer_group_interface::set_ordered (span_, ly_symbol2scm ("elements"), false);
+      span_ = 0;
+    }
 }
 
+void
+Ledger_line_engraver::acknowledge_staff_symbol (Grob_info s)
+{
+  Spanner *sym = dynamic_cast<Spanner *> (s.grob ());
+
+  if (!span_
+      || (span_->get_bound (LEFT) != sym->get_bound (LEFT)))
+    {
+      stop_spanner ();
+      start_spanner ();
+    }
+}
 
 void
-Ledger_line_engraver::acknowledge_grob (Grob_info s)
+Ledger_line_engraver::acknowledge_ledgered (Grob_info s)
 {
-  Pointer_group_interface::add_grob (span_, ly_symbol2scm ("note-heads"),
-				     s.grob_);
+  ledgered_grobs_.push_back (s.grob ());
 }
 
-ENTER_DESCRIPTION (Ledger_line_engraver,
-		   "Creates spanner to draw ledger lines",
-		   /* creats*/       "LedgerLineSpanner",
-		   /* accepts */     "",
-		   /* acks  */      "note-head-interface", // ledgered-interface? 
-		   /* reads */       "",
-		   /* write */       "")
+#include "translator.icc"
+
+ADD_ACKNOWLEDGER (Ledger_line_engraver, ledgered);
+ADD_ACKNOWLEDGER (Ledger_line_engraver, staff_symbol);
+ADD_TRANSLATOR (Ledger_line_engraver,
+		/* doc */
+		"Create the spanner to draw ledger lines, and notices"
+		" objects that need ledger lines.",
+
+		/* create */
+		"LedgerLineSpanner ",
+
+		/* read */
+		"",
+
+		/* write */
+		""
+		);