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--2005 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8
   9
  10 #include "score.hh"
  11 #include "paper-column.hh"
  12 #include "output-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 public:
  22   TRANSLATOR_DECLARATIONS (Staff_symbol_engraver);
  23
  24 protected:
  25   Spanner *span_;
  26
  27   virtual ~Staff_symbol_engraver ();
  28   virtual void acknowledge_grob (Grob_info);
  29   virtual void finalize ();
  30   virtual void process_music ();
  31 };
  32
  33
  34 Staff_symbol_engraver::~Staff_symbol_engraver ()
  35 {
  36   assert (!span_);
  37 }
  38
  39 Staff_symbol_engraver::Staff_symbol_engraver ()
  40 {
  41   span_ = 0;
  42 }
  43
  44 void
  45 Staff_symbol_engraver::process_music ()
  46 {
  47   if (!span_)
  48     {
  49       span_ = make_spanner ("StaffSymbol", SCM_EOL);
  50
  51       span_->set_bound (LEFT, unsmob_grob (get_property ("currentCommandColumn")));
  52
  53
  54     }
  55 }
  56
  57 void
  58 Staff_symbol_engraver::finalize ()
  59 {
  60   if (span_)
  61     {
  62       span_->set_bound (RIGHT, unsmob_grob (get_property ("currentCommandColumn")));
  63     }
  64   span_ = 0;
  65 }
  66
  67 void
  68 Staff_symbol_engraver::acknowledge_grob (Grob_info s)
  69 {
  70   s.grob_->set_property ("staff-symbol", span_->self_scm ());
  71 }
  72
  73
  74
  75
  76 ADD_TRANSLATOR (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 */       "");
  84
  85 /****************************************************************/
  86
  87
  88 class Tab_staff_symbol_engraver : public Staff_symbol_engraver
  89 {
  90 public:
  91   TRANSLATOR_DECLARATIONS (Tab_staff_symbol_engraver);
  92 protected:
  93   virtual void process_music ();
  94 };
  95
  96 void
  97 Tab_staff_symbol_engraver::process_music ()
  98 {
  99   bool init = !span_;
 100   Staff_symbol_engraver::process_music ();
 101   if (init)
 102     {
 103       int k = scm_ilength (get_property ("stringTunings"));
 104       if (k>= 0)
 105         span_->set_property ("line-count", scm_int2num (k));
 106     }
 107 }
 108
 109 Tab_staff_symbol_engraver::Tab_staff_symbol_engraver ()
 110 {
 111 }
 112
 113 ADD_TRANSLATOR (Tab_staff_symbol_engraver,
 114 /* descr */       "Create a staff-symbol, but look at stringTunings for the number of lines."
 115 "staff lines.",
 116 /* creats*/       "StaffSymbol",
 117 /* accepts */     "",
 118 /* acks  */      "grob-interface",
 119 /* reads */       "stringTunings",
 120 /* write */       "");