lily/slur-performer.cc

   1 /*
   2   slur-performer.cc -- implement Slur_performer
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1996--2007 Jan Nieuwenhuizen <janneke@gnu.org>
   7 */
   8
   9 #include "performer.hh"
  10 #include "audio-item.hh"
  11 #include "audio-column.hh"
  12 #include "global-context.hh"
  13 #include "stream-event.hh"
  14 #include "warn.hh"
  15
  16 #include "translator.icc"
  17
  18 /*
  19   this is C&P from beam_performer.
  20 */
  21
  22 class Slur_performer : public Performer
  23 {
  24 public:
  25   TRANSLATOR_DECLARATIONS (Slur_performer);
  26
  27 protected:
  28   void start_translation_timestep ();
  29   void process_music ();
  30   void set_melisma (bool);
  31
  32   DECLARE_TRANSLATOR_LISTENER (slur);
  33 private:
  34   Stream_event *start_ev_;
  35   Stream_event *now_stop_ev_;
  36   bool slur_;
  37 };
  38
  39 Slur_performer::Slur_performer ()
  40 {
  41   slur_ = false;
  42   start_ev_ = 0;
  43   now_stop_ev_ = 0;
  44 }
  45
  46 void
  47 Slur_performer::process_music ()
  48 {
  49   if (now_stop_ev_)
  50     {
  51       slur_ = false;
  52       set_melisma (false);
  53     }
  54
  55   if (start_ev_)
  56     {
  57       slur_ = true;
  58       set_melisma (true);
  59     }
  60 }
  61
  62 void
  63 Slur_performer::set_melisma (bool ml)
  64 {
  65   context ()->set_property ("slurMelismaBusy", ml ? SCM_BOOL_T : SCM_BOOL_F);
  66 }
  67
  68 void
  69 Slur_performer::start_translation_timestep ()
  70 {
  71   start_ev_ = 0;
  72   now_stop_ev_ = 0;
  73 }
  74
  75 IMPLEMENT_TRANSLATOR_LISTENER (Slur_performer, slur);
  76 void
  77 Slur_performer::listen_slur (Stream_event *ev)
  78 {
  79   Direction d = to_dir (ev->get_property ("span-direction"));
  80
  81   if (d == START)
  82     start_ev_ = ev;
  83   else if (d == STOP)
  84     now_stop_ev_ = ev;
  85 }
  86
  87 ADD_TRANSLATOR (Slur_performer,
  88                 /* doc */
  89                 "",
  90
  91                 /* create */
  92                 "",
  93
  94                 /* read */
  95                 "",
  96
  97                 /* write */
  98                 ""
  99                 );