lily/breathing-sign-engraver.cc

   1 /*
   2   breathing_sign-engraver.cc -- implement Breathing_sign_engraver
   3
   4   Copyright (C) 1999 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 "musical-request.hh"
  19 #include "command-request.hh"
  20 #include "engraver-group-engraver.hh"
  21 #include "item.hh"
  22 #include "engraver.hh"
  23 #include "command-request.hh"
  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   virtual void start_translation_timestep ();
  34
  35 private:
  36   Breathing_sign_req * breathing_sign_req_;
  37   Grob * breathing_sign_;
  38 };
  39
  40 Breathing_sign_engraver::Breathing_sign_engraver ()
  41 {
  42   breathing_sign_ = 0;
  43   breathing_sign_req_ = 0;
  44 }
  45
  46 bool
  47 Breathing_sign_engraver::try_music (Music*r)
  48 {
  49   if (Breathing_sign_req  * b= dynamic_cast <Breathing_sign_req *> (r))
  50     {
  51       breathing_sign_req_ = b;
  52       return true;
  53     }
  54
  55   return false;
  56 }
  57
  58 void
  59 Breathing_sign_engraver::process_acknowledged_grobs ()
  60 {
  61   if (breathing_sign_req_ && ! breathing_sign_)
  62     {
  63       SCM b = get_property ("BreathingSign");
  64       breathing_sign_ = new Item (b);
  65
  66       announce_grob(breathing_sign_, breathing_sign_req_->self_scm());
  67       breathing_sign_req_ = 0;
  68     }
  69 }
  70
  71 void
  72 Breathing_sign_engraver::stop_translation_timestep ()
  73 {
  74   if (breathing_sign_)
  75     {
  76       typeset_grob (breathing_sign_);
  77       breathing_sign_ = 0;
  78     }
  79 }
  80
  81 void
  82 Breathing_sign_engraver::start_translation_timestep ()
  83 {
  84   breathing_sign_req_ = 0;
  85 }
  86
  87
  88 ENTER_DESCRIPTION(Breathing_sign_engraver,
  89 /* descr */       "",
  90 /* creats*/       "BreathingSign",
  91 /* acks  */       "",
  92 /* reads */       "",
  93 /* write */       "");