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 "event.hh"
  19
  20 #include "engraver-group-engraver.hh"
  21 #include "item.hh"
  22 #include "engraver.hh"
  23
  24
  25 class Breathing_sign_engraver : public Engraver {
  26 public:
  27   TRANSLATOR_DECLARATIONS (Breathing_sign_engraver);
  28
  29 protected:
  30   virtual bool try_music (Music *req);
  31   virtual void process_acknowledged_grobs ();
  32   virtual void stop_translation_timestep ();
  33
  34 private:
  35   Music * breathing_sign_req_;
  36   Grob * breathing_sign_;
  37 };
  38
  39 Breathing_sign_engraver::Breathing_sign_engraver ()
  40 {
  41   breathing_sign_ = 0;
  42   breathing_sign_req_ = 0;
  43 }
  44
  45 bool
  46 Breathing_sign_engraver::try_music (Music*r)
  47 {
  48   breathing_sign_req_ = r;
  49   return true;
  50 }
  51
  52 void
  53 Breathing_sign_engraver::process_acknowledged_grobs ()
  54 {
  55   if (breathing_sign_req_ && ! breathing_sign_)
  56     {
  57       breathing_sign_ = make_item ("BreathingSign");
  58
  59       announce_grob (breathing_sign_, breathing_sign_req_->self_scm ());
  60       breathing_sign_req_ = 0;
  61     }
  62 }
  63
  64 void
  65 Breathing_sign_engraver::stop_translation_timestep ()
  66 {
  67   if (breathing_sign_)
  68     {
  69       typeset_grob (breathing_sign_);
  70       breathing_sign_ = 0;
  71     }
  72   breathing_sign_req_ = 0;
  73 }
  74
  75
  76 ENTER_DESCRIPTION (Breathing_sign_engraver,
  77 /* descr */       "",
  78 /* creats*/       "BreathingSign",
  79 /* accepts */     "breathing-event",
  80 /* acks  */      "",
  81 /* reads */       "",
  82 /* write */       "");