lily/breathing-sign-engraver.cc

   1 /*
   2   breathing_sign-engraver.cc -- implement Breathing_sign_engraver
   3
   4   (c) 1999--2006 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 #include "staff-symbol-referencer.hh"
  16 #include "breathing-sign.hh"
  17 #include "engraver-group.hh"
  18 #include "item.hh"
  19
  20 class Breathing_sign_engraver : public Engraver
  21 {
  22 public:
  23   TRANSLATOR_DECLARATIONS (Breathing_sign_engraver);
  24
  25 protected:
  26   virtual bool try_music (Music *event);
  27   void process_acknowledged ();
  28   void stop_translation_timestep ();
  29
  30 private:
  31   Music *breathing_sign_event_;
  32   Grob *breathing_sign_;
  33 };
  34
  35 Breathing_sign_engraver::Breathing_sign_engraver ()
  36 {
  37   breathing_sign_ = 0;
  38   breathing_sign_event_ = 0;
  39 }
  40
  41 bool
  42 Breathing_sign_engraver::try_music (Music *r)
  43 {
  44   breathing_sign_event_ = r;
  45   return true;
  46 }
  47
  48 void
  49 Breathing_sign_engraver::process_acknowledged ()
  50 {
  51   if (breathing_sign_event_ && ! breathing_sign_)
  52     {
  53       breathing_sign_ = make_item ("BreathingSign", breathing_sign_event_->self_scm ());
  54       breathing_sign_event_ = 0;
  55     }
  56 }
  57
  58 void
  59 Breathing_sign_engraver::stop_translation_timestep ()
  60 {
  61   breathing_sign_ = 0;
  62   breathing_sign_event_ = 0;
  63 }
  64
  65 #include "translator.icc"
  66
  67 ADD_TRANSLATOR (Breathing_sign_engraver,
  68                 /* doc */ "",
  69                 /* create */ "BreathingSign",
  70                 /* accept */ "breathing-event",
  71                 /* read */ "",
  72                 /* write */ "");