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_l);
  31   virtual void create_grobs ();
  32   virtual void stop_translation_timestep ();
  33   virtual void start_translation_timestep ();
  34
  35 private:
  36   Breathing_sign_req * breathing_sign_req_l_;
  37   Grob * breathing_sign_p_;
  38 };
  39
  40 Breathing_sign_engraver::Breathing_sign_engraver ()
  41 {
  42   breathing_sign_p_ = 0;
  43   breathing_sign_req_l_ = 0;
  44 }
  45
  46 bool
  47 Breathing_sign_engraver::try_music (Music*r_l)
  48 {
  49   if (Breathing_sign_req  * b= dynamic_cast <Breathing_sign_req *> (r_l))
  50     {
  51       breathing_sign_req_l_ = b;
  52       return true;
  53     }
  54
  55   return false;
  56 }
  57
  58 void
  59 Breathing_sign_engraver::create_grobs ()
  60 {
  61   if (breathing_sign_req_l_ && ! breathing_sign_p_)
  62     {
  63       SCM b = get_property ("BreathingSign");
  64       breathing_sign_p_ = new Item (b);
  65
  66       Breathing_sign::set_interface (breathing_sign_p_);
  67
  68       announce_grob(breathing_sign_p_, breathing_sign_req_l_->self_scm());
  69       breathing_sign_req_l_ = 0;
  70     }
  71 }
  72
  73 void
  74 Breathing_sign_engraver::stop_translation_timestep ()
  75 {
  76   if (breathing_sign_p_)
  77     {
  78       typeset_grob (breathing_sign_p_);
  79       breathing_sign_p_ = 0;
  80     }
  81 }
  82
  83 void
  84 Breathing_sign_engraver::start_translation_timestep ()
  85 {
  86   breathing_sign_req_l_ = 0;
  87 }
  88
  89
  90 ENTER_DESCRIPTION(Breathing_sign_engraver,
  91 /* descr */       "",
  92 /* creats*/       "BreathingSign",
  93 /* acks  */       "",
  94 /* reads */       "",
  95 /* write */       "");