source file of the GNU LilyPond music typesetter
- (c) 1997 Jan Nieuwenhuizen <jan@digicash.com>
+ (c) 1997--2004 Jan Nieuwenhuizen <janneke@gnu.org>
*/
-#include "key-performer.hh"
-#include "command-request.hh"
-#include "midi-item.hh"
+#include "lily-guile.hh"
+#include "audio-item.hh"
+#include "performer.hh"
+#include "warn.hh"
-IMPLEMENT_IS_TYPE_B1(Key_performer,Performer);
-ADD_THIS_PERFORMER(Key_performer);
+class Key_performer : public Performer
+{
+public:
+ TRANSLATOR_DECLARATIONS (Key_performer);
+ ~Key_performer ();
+
+protected:
+ virtual bool try_music (Music* req);
+ virtual void create_audio_elements ();
+ virtual void stop_translation_timestep ();
+
+private:
+ Key_change_ev* key_req_;
+ Audio_key* audio_;
+};
-Key_performer::Key_performer()
+Key_performer::Key_performer ()
{
- key_req_l_ = 0;
+ key_req_ = 0;
+ audio_ = 0;
}
-Key_performer::~Key_performer()
+Key_performer::~Key_performer ()
{
}
-void
-Key_performer::do_print() const
+void
+Key_performer::create_audio_elements ()
{
-#ifndef NPRINT
- if ( key_req_l_ )
- key_req_l_->print();
-#endif
+ if (key_req_)
+ {
+ SCM pitchlist = key_req_->get_property ("pitch-alist");
+ SCM proc = ly_scheme_function ("alterations-in-key");
+
+ SCM acc = gh_call1 (proc, pitchlist);
+
+ Pitch key_do (0,
+ gh_scm2int (ly_caar (pitchlist)),
+ gh_scm2int (ly_cdar (pitchlist)));
+
+ Pitch c_do (0, 0, 0);
+
+ SCM c_pitchlist
+ = ly_transpose_key_alist (pitchlist,
+ interval (key_do, c_do).smobbed_copy ());
+
+ /* MIDI keys are too limited for lilypond scales.
+ We check for minor scale and assume major otherwise. */
+ SCM minor = scm_c_eval_string ("minor");
+ audio_ = new Audio_key (gh_scm2int (acc),
+ SCM_BOOL_T != scm_equal_p (minor, c_pitchlist));
+
+ Audio_element_info info (audio_, key_req_);
+ announce_element (info);
+ key_req_ = 0;
+ }
}
void
-Key_performer::process_requests()
+Key_performer::stop_translation_timestep ()
{
- if ( key_req_l_ ) {
- int sharps_i = key_req_l_->sharps_i();
- int flats_i = key_req_l_->flats_i();
- // midi cannot handle non-conventional keys
- if ( !( flats_i && sharps_i ) ) {
- Midi_key k( sharps_i - flats_i, key_req_l_->minor_b() );
- play_event( &k );
- }
- key_req_l_ = 0;
+ if (audio_)
+ {
+ play_element (audio_);
+ audio_ = 0;
}
}
bool
-Key_performer::do_try_request( Request* req_l )
+Key_performer::try_music (Music* req)
{
- if ( key_req_l_ )
- return false;
+ if (Key_change_ev *kc = dynamic_cast <Key_change_ev *> (req))
+ {
+ if (key_req_)
+ warning (_ ("FIXME: key change merge"));
- if ( req_l->command() )
- key_req_l_ = req_l->command()->keychange();
-
- if ( key_req_l_ )
- return true;
+ key_req_ = kc;
+ return true;
+ }
- return false;
+ return false;
}
+ENTER_DESCRIPTION (Key_performer,
+ "","",
+ "key-change-event",
+ "","","");