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 #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
  36 Staff_symbol_engraver::~Staff_symbol_engraver()
  37 {
  38   assert (!span_p_);
  39 }
  40
  41 Staff_symbol_engraver::Staff_symbol_engraver()
  42 {
  43   span_p_ = 0;
  44 }
  45
  46 void
  47 Staff_symbol_engraver::do_creation_processing()
  48 {
  49   span_p_ = new Staff_symbol (get_property ("staffSymbolBasicProperties"));
  50   span_p_->set_bound(LEFT,get_staff_info().command_pcol_l ());
  51
  52   announce_element (Score_element_info (span_p_, 0));
  53 }
  54
  55 void
  56 Staff_symbol_engraver::do_removal_processing()
  57 {
  58   SCM n = get_property ("numberOfStaffLines");
  59   SCM ss = get_property ("staffSpace");
  60
  61   if (gh_number_p (ss))
  62     span_p_->set_elt_property ("staff-space", ss);
  63   if (gh_number_p (n))
  64     span_p_->set_elt_property ("line-count", n);
  65
  66   span_p_->set_bound(RIGHT,get_staff_info().command_pcol_l ());
  67   typeset_element (span_p_);
  68   span_p_ =0;
  69 }
  70
  71 void
  72 Staff_symbol_engraver::acknowledge_element (Score_element_info s)
  73 {
  74   s.elem_l_->set_elt_pointer ("staff-symbol", span_p_->self_scm_);
  75   s.elem_l_->add_dependency (span_p_); // UGH. UGH. UGH
  76 }
  77
  78
  79 ADD_THIS_TRANSLATOR(Staff_symbol_engraver);
  80