lily/include/event.hh

   1 /*
   2   event.hh -- declare Event baseclasses.
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c)  1997--2002 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8
   9 #ifndef EVENT_HH
  10 #define EVENT_HH
  11
  12
  13 #include "string.hh"
  14 #include "moment.hh"
  15 #include "virtual-methods.hh"
  16 #include "input.hh"
  17 #include "music.hh"
  18 #include "duration.hh"
  19 #include "pitch.hh"
  20
  21 /** An atom of musical information.  This is an abstract class for any
  22   piece of music that does not contain other Music.
  23
  24
  25  */
  26 class Event : public Music {
  27 public:
  28   Event ();
  29   VIRTUAL_COPY_CONS (Music);
  30   virtual void compress (Moment);
  31   virtual void transpose (Pitch);
  32   virtual Moment get_length () const;
  33   virtual Pitch to_relative_octave (Pitch);
  34 };
  35
  36
  37 /**
  38     Handle key changes.
  39 */
  40 class Key_change_ev  : public Event
  41 {
  42 public:
  43   SCM pitch_alist ();
  44
  45 protected:
  46   VIRTUAL_COPY_CONS (Music);
  47   void transpose (Pitch  d);
  48 };
  49
  50 SCM transpose_key_alist (SCM,SCM);
  51
  52
  53
  54 #endif