lily/breathing-sign-engraver.cc

   1 /*
   2   breathing_sign-engraver.cc -- implement Breathing_sign_engraver
   3
   4   (c)  1999--2003 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       SCM b = get_property ("BreathingSign");
  58       breathing_sign_ = new Item (b);
  59
  60       announce_grob(breathing_sign_, breathing_sign_req_->self_scm());
  61       breathing_sign_req_ = 0;
  62     }
  63 }
  64
  65 void
  66 Breathing_sign_engraver::stop_translation_timestep ()
  67 {
  68   if (breathing_sign_)
  69     {
  70       typeset_grob (breathing_sign_);
  71       breathing_sign_ = 0;
  72     }
  73   breathing_sign_req_ = 0;
  74 }
  75
  76
  77 ENTER_DESCRIPTION(Breathing_sign_engraver,
  78 /* descr */       "",
  79 /* creats*/       "BreathingSign",
  80 /* accepts */     "breathing-event",
  81 /* acks  */      "",
  82 /* reads */       "",
  83 /* write */       "");