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--2002 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_p_;
  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 initialize ();
  30 };
  31
  32
  33 Staff_symbol_engraver::~Staff_symbol_engraver ()
  34 {
  35   assert (!span_p_);
  36 }
  37
  38 Staff_symbol_engraver::Staff_symbol_engraver ()
  39 {
  40   span_p_ = 0;
  41 }
  42
  43 void
  44 Staff_symbol_engraver::initialize ()
  45 {
  46   span_p_ = new Spanner (get_property ("StaffSymbol"));
  47
  48   span_p_->set_bound (LEFT, unsmob_grob (get_property ("currentCommandColumn")));
  49
  50   announce_grob(span_p_, SCM_EOL);
  51 }
  52
  53 void
  54 Staff_symbol_engraver::finalize ()
  55 {
  56   span_p_->set_bound (RIGHT,unsmob_grob (get_property ("currentCommandColumn")));
  57   typeset_grob (span_p_);
  58   span_p_ =0;
  59 }
  60
  61 void
  62 Staff_symbol_engraver::acknowledge_grob (Grob_info s)
  63 {
  64   s.grob_l_->set_grob_property ("staff-symbol", span_p_->self_scm ());
  65
  66   // remove this. probly not necessary?
  67   s.grob_l_->add_dependency (span_p_); // UGH. UGH. UGH
  68 }
  69
  70
  71
  72
  73 ENTER_DESCRIPTION(Staff_symbol_engraver,
  74 /* descr */       "create the constellation of five (default)
  75 staff lines.",
  76 /* creats*/       "StaffSymbol",
  77 /* acks  */       "grob-interface",
  78 /* reads */       "",
  79 /* write */       "");