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--2004 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 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   // remove this. probly not necessary?
  73   s.grob_->add_dependency (span_); // UGH. UGH. UGH
  74 }
  75
  76
  77
  78
  79 ENTER_DESCRIPTION (Staff_symbol_engraver,
  80 /* descr */       "Create the constellation of five (default) "
  81 "staff lines.",
  82 /* creats*/       "StaffSymbol",
  83 /* accepts */     "",
  84 /* acks  */      "grob-interface",
  85 /* reads */       "",
  86 /* write */       "");
  87
  88 /****************************************************************/
  89
  90
  91 class Tab_staff_symbol_engraver : public Staff_symbol_engraver
  92 {
  93 public:
  94   TRANSLATOR_DECLARATIONS (Tab_staff_symbol_engraver);
  95 protected:
  96   virtual void process_music ();
  97 };
  98
  99 void
 100 Tab_staff_symbol_engraver::process_music ()
 101 {
 102   bool init = !span_;
 103   Staff_symbol_engraver::process_music ();
 104   if (init)
 105     {
 106       int k = scm_ilength (get_property ("stringTunings"));
 107       if (k>=0)
 108         span_->set_property ("line-count", scm_int2num (k));
 109     }
 110 }
 111
 112 Tab_staff_symbol_engraver::Tab_staff_symbol_engraver ()
 113 {
 114 }
 115
 116 ENTER_DESCRIPTION (Tab_staff_symbol_engraver,
 117 /* descr */       "Create a staff-symbol, but look at stringTunings for the number of lines."
 118 "staff lines.",
 119 /* creats*/       "StaffSymbol",
 120 /* accepts */     "",
 121 /* acks  */      "grob-interface",
 122 /* reads */       "stringTunings",
 123 /* write */       "");