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