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_element (Score_element_info);
  29   virtual void do_removal_processing();
  30   virtual void do_creation_processing();
  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::do_creation_processing()
  46 {
  47   span_p_ = new Spanner (get_property ("staffSymbolBasicProperties"));
  48
  49   span_p_->set_bound(LEFT, unsmob_element (get_property ("currentCommandColumn")));
  50
  51   announce_element (span_p_, 0);
  52 }
  53
  54 void
  55 Staff_symbol_engraver::do_removal_processing()
  56 {
  57   SCM n = get_property ("numberOfStaffLines");
  58   SCM ss = get_property ("staffSpace");
  59
  60   if (gh_number_p (ss))
  61     span_p_->set_elt_property ("staff-space", ss);
  62   if (gh_number_p (n))
  63     span_p_->set_elt_property ("line-count", n);
  64
  65   span_p_->set_bound(RIGHT,unsmob_element (get_property ("currentCommandColumn")));
  66   typeset_element (span_p_);
  67   span_p_ =0;
  68 }
  69
  70 void
  71 Staff_symbol_engraver::acknowledge_element (Score_element_info s)
  72 {
  73   s.elem_l_->set_elt_property ("staff-symbol", span_p_->self_scm_);
  74   s.elem_l_->add_dependency (span_p_); // UGH. UGH. UGH
  75 }
  76
  77
  78 ADD_THIS_TRANSLATOR(Staff_symbol_engraver);
  79