lily/staff-symbol-engraver.cc

   1 /*
   2   staff-symbol-engraver.cc -- implement Staff_symbol_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c)  1997--2003 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8
   9
  10 #include "score.hh"
  11 #include "paper-column.hh"
  12 #include "paper-def.hh"
  13 #include "side-position-interface.hh"
  14 #include "engraver.hh"
  15 #include "moment.hh"
  16
  17 /**
  18   Manage the staff symbol.
  19  */
  20 class Staff_symbol_engraver : public Engraver {
  21   Spanner *span_;
  22 public:
  23   TRANSLATOR_DECLARATIONS(Staff_symbol_engraver);
  24
  25 protected:
  26   virtual ~Staff_symbol_engraver ();
  27   virtual void acknowledge_grob (Grob_info);
  28   virtual void finalize ();
  29   virtual void process_music ();
  30 };
  31
  32
  33 Staff_symbol_engraver::~Staff_symbol_engraver ()
  34 {
  35   assert (!span_);
  36 }
  37
  38 Staff_symbol_engraver::Staff_symbol_engraver ()
  39 {
  40   span_ = 0;
  41 }
  42
  43 void
  44 Staff_symbol_engraver::process_music ()
  45 {
  46   if (!span_)
  47     {
  48       span_ = new Spanner (get_property ("StaffSymbol"));
  49
  50       span_->set_bound (LEFT, unsmob_grob (get_property ("currentCommandColumn")));
  51
  52       announce_grob(span_, SCM_EOL);
  53     }
  54 }
  55
  56 void
  57 Staff_symbol_engraver::finalize ()
  58 {
  59   span_->set_bound (RIGHT,unsmob_grob (get_property ("currentCommandColumn")));
  60   typeset_grob (span_);
  61   span_ =0;
  62 }
  63
  64 void
  65 Staff_symbol_engraver::acknowledge_grob (Grob_info s)
  66 {
  67   s.grob_->set_grob_property ("staff-symbol", span_->self_scm ());
  68
  69   // remove this. probly not necessary?
  70   s.grob_->add_dependency (span_); // UGH. UGH. UGH
  71 }
  72
  73
  74
  75
  76 ENTER_DESCRIPTION(Staff_symbol_engraver,
  77 /* descr */       "create the constellation of five (default) "
  78 "staff lines.",
  79 /* creats*/       "StaffSymbol",
  80 /* accepts */     "",
  81 /* acks  */      "grob-interface",
  82 /* reads */       "",
  83 /* write */       "");