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--2004 Jan Nieuwenhuizen <janneke@gnu.org>
   7  */
   8
   9 #include "performer.hh"
  10 #include "event.hh"
  11 #include "audio-item.hh"
  12 #include "audio-column.hh"
  13 #include "global-context.hh"
  14 #include "warn.hh"
  15
  16 /*
  17   this is C&P from beam_performer.
  18  */
  19
  20 class Slur_performer : public Performer {
  21 public:
  22   TRANSLATOR_DECLARATIONS (Slur_performer);
  23
  24 protected:
  25   virtual bool try_music (Music *ev) ;
  26   virtual void start_translation_timestep ();
  27   virtual void process_music ();
  28   void set_melisma (bool);
  29 private:
  30   Music *start_ev_;
  31   Music *now_stop_ev_;
  32   bool slur_;
  33 };
  34
  35 Slur_performer::Slur_performer ()
  36 {
  37   slur_ = false;
  38   start_ev_ = 0;
  39   now_stop_ev_ = 0;
  40 }
  41
  42
  43 void
  44 Slur_performer::process_music ()
  45 {
  46   if (now_stop_ev_)
  47     {
  48       slur_ = false;
  49       set_melisma (false);
  50     }
  51
  52   if (start_ev_)
  53     {
  54       slur_ = true;
  55       set_melisma (true);
  56     }
  57 }
  58
  59
  60 void
  61 Slur_performer::set_melisma (bool ml)
  62 {
  63   daddy_context_->set_property ("slurMelismaBusy", ml ? SCM_BOOL_T :SCM_BOOL_F);
  64 }
  65
  66 void
  67 Slur_performer::start_translation_timestep ()
  68 {
  69   start_ev_ = 0;
  70   now_stop_ev_ = 0;
  71 }
  72
  73 bool
  74 Slur_performer::try_music (Music *m)
  75 {
  76   if (m->is_mus_type ("slur-event"))
  77     {
  78       Direction d = to_dir (m->get_property ("span-direction"));
  79
  80       if (d == START)
  81         {
  82           start_ev_ = m;
  83         }
  84       else if (d==STOP)
  85         {
  86           now_stop_ev_ = m;
  87         }
  88       return true;
  89     }
  90   return false;
  91 }
  92
  93 ENTER_DESCRIPTION (Slur_performer,"","",
  94                   "slur-event","","","");
  95