lily/time-signature-engraver.cc

   1 /*
   2   time_signature-reg.cc -- implement Time_signature_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 "time-signature.hh"
  10 #include "command-request.hh"
  11 #include "engraver.hh"
  12
  13 #include "timing-engraver.hh"
  14 #include "engraver-group-engraver.hh"
  15
  16
  17 /**
  18   generate time_signatures.
  19   */
  20 class Time_signature_engraver : public Engraver {
  21 protected:
  22   virtual void do_process_music();
  23   virtual void do_pre_move_processing();
  24 public:
  25   VIRTUAL_COPY_CONS(Translator);
  26   Item * time_signature_p_;
  27
  28   Time_signature_engraver();
  29 };
  30
  31
  32 Time_signature_engraver::Time_signature_engraver()
  33 {
  34   time_signature_p_ =0;
  35 }
  36
  37 void
  38 Time_signature_engraver::do_process_music()
  39 {
  40   /*
  41     UGH.
  42     this should use properties.
  43    */
  44   Translator * result =
  45     daddy_grav_l()->get_simple_translator ("Timing_engraver");  // ugh
  46
  47   if (!result)
  48     {
  49       warning (_ ("lost in time:"));
  50       warning (_f ("can't find: `%s'", " Timing_translator"));
  51       return ;
  52     }
  53
  54   Timing_engraver * timing_grav_l= dynamic_cast<Timing_engraver *> (result);
  55
  56   Time_signature_change_req *req = timing_grav_l->time_signature_req_l();
  57   if (req)
  58     {
  59       time_signature_p_ = new Item (get_property ("basicTimeSignatureProperties"));
  60       time_signature_p_->set_elt_property ("fraction",
  61                                            gh_cons (gh_int2scm (req->beats_i_),
  62                                                     gh_int2scm (req->one_beat_i_)));
  63     }
  64
  65
  66   if (time_signature_p_)
  67     announce_element (time_signature_p_, req);
  68 }
  69
  70 void
  71 Time_signature_engraver::do_pre_move_processing()
  72 {
  73   if (time_signature_p_)
  74     {
  75       typeset_element (time_signature_p_);
  76       time_signature_p_ =0;
  77     }
  78 }
  79
  80
  81 ADD_THIS_TRANSLATOR(Time_signature_engraver);
  82
  83