lily/staff-symbol-engraver.cc

   1 /*
   2   staff-sym-reg.cc -- implement Staff_symbol_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c)  1997--1999 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8
   9 #include "staff-symbol.hh"
  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   Staff_symbol *span_p_;
  22 public:
  23   VIRTUAL_COPY_CONS(Translator);
  24   Staff_symbol_engraver();
  25
  26 protected:
  27   virtual ~Staff_symbol_engraver();
  28
  29   virtual void acknowledge_element (Score_element_info);
  30   virtual void do_removal_processing();
  31   virtual void do_creation_processing();
  32
  33 };
  34
  35 ADD_THIS_TRANSLATOR (Staff_symbol_engraver);
  36
  37 Staff_symbol_engraver::~Staff_symbol_engraver()
  38 {
  39   assert (!span_p_);
  40 }
  41
  42 Staff_symbol_engraver::Staff_symbol_engraver()
  43 {
  44   span_p_ = 0;
  45 }
  46
  47 void
  48 Staff_symbol_engraver::do_creation_processing()
  49 {
  50   span_p_ = new Staff_symbol;
  51   span_p_->set_bounds(LEFT,get_staff_info().command_pcol_l ());
  52   announce_element (Score_element_info (span_p_, 0));
  53 }
  54
  55 void
  56 Staff_symbol_engraver::do_removal_processing()
  57 {
  58   span_p_->set_bounds(RIGHT,get_staff_info().command_pcol_l ());
  59   typeset_element (span_p_);
  60   span_p_ =0;
  61 }
  62
  63 void
  64 Staff_symbol_engraver::acknowledge_element (Score_element_info s)
  65 {
  66   s.elem_l_->set_elt_property ("staff-symbol", span_p_->self_scm_);
  67   s.elem_l_->add_dependency (span_p_); // UGH. UGH. UGH
  68
  69   SCM ss =s.elem_l_->remove_elt_property ("staff-support");
  70   if (to_boolean (ss))
  71     {
  72       Side_position_interface si (s.elem_l_);
  73       if (si.has_interface_b ())
  74         si.add_support (span_p_);
  75     }
  76 }
  77