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   Breathing_sign_engraver();
  28   VIRTUAL_COPY_CONS(Translator);
  29
  30 protected:
  31   virtual bool try_music (Music *req_l);
  32   virtual void create_grobs ();
  33   virtual void stop_translation_timestep();
  34   virtual void start_translation_timestep();
  35
  36 private:
  37   Breathing_sign_req * breathing_sign_req_l_;
  38   Grob * breathing_sign_p_;
  39 };
  40
  41 Breathing_sign_engraver::Breathing_sign_engraver()
  42 {
  43   breathing_sign_p_ = 0;
  44   breathing_sign_req_l_ = 0;
  45 }
  46
  47 bool
  48 Breathing_sign_engraver::try_music (Music*r_l)
  49 {
  50   if (Breathing_sign_req  * b= dynamic_cast <Breathing_sign_req *> (r_l))
  51     {
  52       breathing_sign_req_l_ = b;
  53       return true;
  54     }
  55
  56   return false;
  57 }
  58
  59 void
  60 Breathing_sign_engraver::create_grobs ()
  61 {
  62   if(breathing_sign_req_l_ && ! breathing_sign_p_)
  63     {
  64       SCM b = get_property ("BreathingSign");
  65       breathing_sign_p_ = new Item (b);
  66
  67       Breathing_sign::set_interface (breathing_sign_p_);
  68
  69       announce_grob (breathing_sign_p_, breathing_sign_req_l_);
  70       breathing_sign_req_l_ = 0;
  71     }
  72 }
  73
  74 void
  75 Breathing_sign_engraver::stop_translation_timestep()
  76 {
  77   if(breathing_sign_p_)
  78     {
  79       typeset_grob(breathing_sign_p_);
  80       breathing_sign_p_ = 0;
  81     }
  82 }
  83
  84 void
  85 Breathing_sign_engraver::start_translation_timestep()
  86 {
  87   breathing_sign_req_l_ = 0;
  88 }
  89
  90 ADD_THIS_TRANSLATOR(Breathing_sign_engraver);