X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=lily%2Fdispatcher-scheme.cc;h=13854b26d783fc5bde1321064831688d2a57077d;hb=48874ad4fd02df50bd8437e21f91af838bc0eb9d;hp=39e35eefb4f40bf400ca2efa3214e137f3aed4bc;hpb=4bb29573149a0ffa1f881c5e38a0fe68e9e76b67;p=lilypond.git

diff --git a/lily/dispatcher-scheme.cc b/lily/dispatcher-scheme.cc
index 39e35eefb4..13854b26d7 100644
--- a/lily/dispatcher-scheme.cc
+++ b/lily/dispatcher-scheme.cc
@@ -1,7 +1,7 @@
 /*
   This file is part of LilyPond, the GNU music typesetter.
 
-  Copyright (C) 2006--2011 Erik Sandberg  <mandolaerik@gmail.com>
+  Copyright (C) 2006--2012 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
@@ -38,7 +38,7 @@ LY_DEFINE (ly_connect_dispatchers, "ly:connect-dispatchers",
 
   t->register_as_listener (f);
 
-  return SCM_UNDEFINED;
+  return SCM_UNSPECIFIED;
 }
 
 LY_DEFINE (ly_add_listener, "ly:add-listener",
@@ -60,7 +60,36 @@ 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",
@@ -74,5 +103,5 @@ LY_DEFINE (ly_broadcast, "ly:broadcast",
 
   LY_ASSERT_SMOB (Stream_event, ev, 2);
   d->broadcast (e);
-  return SCM_UNDEFINED;
+  return SCM_UNSPECIFIED;
 }