/*
This file is part of LilyPond, the GNU music typesetter.
- Copyright (C) 2006--2012 Erik Sandberg <mandolaerik@gmail.com>
+ Copyright (C) 2006--2014 Erik Sandberg <mandolaerik@gmail.com>
LilyPond is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
t->register_as_listener (f);
- return SCM_UNDEFINED;
+ return SCM_UNSPECIFIED;
}
LY_DEFINE (ly_add_listener, "ly:add-listener",
d->add_listener (*l, sym);
}
- return SCM_UNDEFINED;
+ return SCM_UNSPECIFIED;
+}
+
+LY_DEFINE (ly_listened_event_types, "ly:listened-event-types",
+ 1, 0, 0, (SCM disp),
+ "Return a list of all event types that @var{disp} listens"
+ " to.")
+{
+ LY_ASSERT_SMOB (Dispatcher, disp, 1);
+
+ SCM result = unsmob_dispatcher (disp)->listened_types ();
+
+ scm_remember_upto_here_1 (disp);
+
+ return result;
+}
+
+LY_DEFINE (ly_listened_event_class_p, "ly:listened-event-class?",
+ 2, 0, 0, (SCM disp, SCM cl),
+ "Does @var{disp} listen to any event type in the list"
+ " @var{cl}?")
+{
+ LY_ASSERT_SMOB (Dispatcher, disp, 1);
+ LY_ASSERT_TYPE (scm_is_pair, cl, 2);
+
+ bool result = unsmob_dispatcher (disp)->is_listened_class (cl);
+
+ scm_remember_upto_here_1 (disp);
+
+ return scm_from_bool (result);
}
LY_DEFINE (ly_broadcast, "ly:broadcast",
LY_ASSERT_SMOB (Stream_event, ev, 2);
d->broadcast (e);
- return SCM_UNDEFINED;
+ return SCM_UNSPECIFIED;
}