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--2000 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   VIRTUAL_COPY_CONS(Translator);
  24   Staff_symbol_engraver();
  25
  26 protected:
  27   virtual ~Staff_symbol_engraver();
  28   virtual void acknowledge_grob (Grob_info);
  29   virtual void finalize();
  30   virtual void initialize();
  31 };
  32
  33
  34 Staff_symbol_engraver::~Staff_symbol_engraver()
  35 {
  36   assert (!span_p_);
  37 }
  38
  39 Staff_symbol_engraver::Staff_symbol_engraver()
  40 {
  41   span_p_ = 0;
  42 }
  43
  44 void
  45 Staff_symbol_engraver::initialize()
  46 {
  47   span_p_ = new Spanner (get_property ("StaffSymbol"));
  48
  49   span_p_->set_bound(LEFT, unsmob_grob (get_property ("currentCommandColumn")));
  50
  51   announce_grob (span_p_, 0);
  52 }
  53
  54 void
  55 Staff_symbol_engraver::finalize()
  56 {
  57   span_p_->set_bound(RIGHT,unsmob_grob (get_property ("currentCommandColumn")));
  58   typeset_grob (span_p_);
  59   span_p_ =0;
  60 }
  61
  62 void
  63 Staff_symbol_engraver::acknowledge_grob (Grob_info s)
  64 {
  65   s.elem_l_->set_grob_property ("staff-symbol", span_p_->self_scm ());
  66
  67   // remove this. probly not necessary?
  68   s.elem_l_->add_dependency (span_p_); // UGH. UGH. UGH
  69 }
  70
  71
  72 ADD_THIS_TRANSLATOR(Staff_symbol_engraver);
  73