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 void
  36 Slur_performer::process_music ()
  37 {
  38   if (now_stop_ev_)
  39     {
  40       slur_ = false;
  41     }
  42
  43   if (start_ev_)
  44     {
  45       slur_ = true;
  46       set_melisma (true);
  47     }
  48 }
  49
  50
  51 void
  52 Slur_performer::set_melisma (bool ml)
  53 {
  54   daddy_context_->set_property ("slurMelismaBusy", ml ? SCM_BOOL_T :SCM_BOOL_F);
  55 }
  56
  57 void
  58 Slur_performer::start_translation_timestep ()
  59 {
  60   if (slur_)
  61     {
  62       set_melisma (true);
  63     }
  64
  65   start_ev_ = 0;
  66   now_stop_ev_ = 0;
  67 }
  68
  69 bool
  70 Slur_performer::try_music (Music *m)
  71 {
  72   if (m->is_mus_type ("slur-event"))
  73     {
  74       Direction d = to_dir (m->get_property ("span-direction"));
  75
  76       if (d == START)
  77         {
  78           start_ev_ = m;
  79         }
  80       else if (d==STOP)
  81         {
  82           now_stop_ev_ = m;
  83         }
  84       return true;
  85     }
  86   return false;
  87 }
  88
  89 ENTER_DESCRIPTION (Slur_performer,"","",
  90                   "slur-event","","","");
  91
  92 Slur_performer::Slur_performer ()
  93 {
  94   slur_ = false;
  95 }