lily/breathing-sign-engraver.cc

   1 /*
   2   breathing_sign-engraver.cc -- implement Breathing_sign_engraver
   3
   4   (c) 1999--2004 Michael Krause
   5
   6   written for the GNU LilyPond music typesetter
   7
   8 TODO:
   9
  10   . Cancel any beams running through the breathing sign
  11  ([e8 \breathe f e f] should become [e8] \breathe [f e f])
  12   . Spacing is not yet completely pretty
  13
  14 */
  15
  16 #include "staff-symbol-referencer.hh"
  17 #include "breathing-sign.hh"
  18 #include "engraver-group-engraver.hh"
  19 #include "item.hh"
  20
  21
  22 class Breathing_sign_engraver : public Engraver {
  23 public:
  24   TRANSLATOR_DECLARATIONS (Breathing_sign_engraver);
  25
  26 protected:
  27   virtual bool try_music (Music *req);
  28   virtual void process_acknowledged_grobs ();
  29   virtual void stop_translation_timestep ();
  30
  31 private:
  32   Music * breathing_sign_req_;
  33   Grob * breathing_sign_;
  34 };
  35
  36 Breathing_sign_engraver::Breathing_sign_engraver ()
  37 {
  38   breathing_sign_ = 0;
  39   breathing_sign_req_ = 0;
  40 }
  41
  42 bool
  43 Breathing_sign_engraver::try_music (Music*r)
  44 {
  45   breathing_sign_req_ = r;
  46   return true;
  47 }
  48
  49 void
  50 Breathing_sign_engraver::process_acknowledged_grobs ()
  51 {
  52   if (breathing_sign_req_ && ! breathing_sign_)
  53     {
  54       breathing_sign_ = make_item ("BreathingSign", breathing_sign_req_->self_scm ());
  55       breathing_sign_req_ = 0;
  56     }
  57 }
  58
  59 void
  60 Breathing_sign_engraver::stop_translation_timestep ()
  61 {
  62   breathing_sign_ = 0;
  63   breathing_sign_req_ = 0;
  64 }
  65
  66
  67 ADD_TRANSLATOR (Breathing_sign_engraver,
  68 /* descr */       "",
  69 /* creats*/       "BreathingSign",
  70 /* accepts */     "breathing-event",
  71 /* acks  */      "",
  72 /* reads */       "",
  73 /* write */       "");