lily/key-performer.cc

   1 /*
   2   key-performer.cc -- implement Key_performer
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c)  1997--2000 Jan Nieuwenhuizen <janneke@gnu.org>
   7 */
   8
   9 #include "command-request.hh"
  10 #include "audio-item.hh"
  11 #include "performer.hh"
  12
  13 class Key_performer : public Performer
  14 {
  15 public:
  16   VIRTUAL_COPY_CONS(Translator);
  17
  18   Key_performer();
  19   ~Key_performer();
  20
  21 protected:
  22   virtual bool try_music (Music* req_l);
  23   virtual void create_audio_elements ();
  24   virtual void stop_translation_timestep ();
  25
  26 private:
  27   Key_change_req* key_req_l_;
  28   Audio_key* audio_p_;
  29 };
  30
  31 ADD_THIS_TRANSLATOR (Key_performer);
  32
  33 Key_performer::Key_performer ()
  34 {
  35   key_req_l_ = 0;
  36   audio_p_ = 0;
  37 }
  38
  39 Key_performer::~Key_performer ()
  40 {
  41 }
  42
  43 void
  44 Key_performer::create_audio_elements ()
  45 {
  46   if (key_req_l_ &&
  47       gh_list_p (key_req_l_->get_mus_property ("pitch-alist")))
  48     {
  49       audio_p_ = new Audio_key (); // *key_req_l_->key_);
  50       Audio_element_info info (audio_p_, key_req_l_);
  51       announce_element (info);
  52       key_req_l_ = 0;
  53     }
  54 }
  55
  56 void
  57 Key_performer::stop_translation_timestep ()
  58 {
  59   if (audio_p_)
  60     {
  61       play_element (audio_p_);
  62       audio_p_ = 0;
  63     }
  64 }
  65
  66 bool
  67 Key_performer::try_music (Music* req_l)
  68 {
  69   if (Key_change_req *kc = dynamic_cast <Key_change_req *> (req_l))
  70     {
  71       if (key_req_l_)
  72         warning (_ ("FIXME: key change merge"));
  73
  74       key_req_l_ = kc;
  75       return true;
  76     }
  77
  78   return false;
  79 }
  80