* lily/spanner.cc (find_broken_piece):

[lilypond.git] / lily / include / translator.icc

diff --git a/lily/include/translator.icc b/lily/include/translator.icc
index 14ba2b62b6b022e2dcd994de4dc0b29ccc588696..904e3c127c60bcef5c85cda95dd8d7421bd2009c 100644 (file)
--- a/lily/include/translator.icc
+++ b/lily/include/translator.icc
@@ -9,6 +9,7 @@
 #ifndef TRANSLATOR_ICC
 #define TRANSLATOR_ICC
 
+#include "listener.hh"
 #include "std-vector.hh"
 #include "translator.hh"
 
@@ -16,6 +17,7 @@
    A macro to automate administration of translators.
 */
 #define ADD_THIS_TRANSLATOR(T)                                         \
+  translator_listener_record *T::listener_list_;                       \
   SCM T::static_description_ = SCM_EOL;                                        \
   static void _ ## T ## _adder ()                                      \
   {                                                                    \
@@ -117,6 +119,40 @@ generic_get_acknowledger (SCM sym,
   }                                                                    \
   ADD_SCM_INIT_FUNC (CLASS ## NAME ## _end_ack_adder_initclass, CLASS ## NAME ## _end_ack_adder);
 
+/*
+  Implement the method cl::listen_##m, and make it listen to stream 
+  events of class m.
+ */
+#define IMPLEMENT_TRANSLATOR_LISTENER(cl, m)           \
+void                                                   \
+cl :: _internal_declare_ ## m ()                       \
+{                                                      \
+  static translator_listener_record r;                 \
+  add_translator_listener (&listener_list_, &r, _get_ ## m ## _listener, #m); \
+}                                                      \
+                                                       \
+ADD_SCM_INIT_FUNC (cl ## _declare_event_ ## m, cl::_internal_declare_ ## m);   \
+                                                       \
+Listener                                               \
+cl :: _get_ ## m ## _listener (void *me)               \
+{                                                      \
+  cl *obj = (cl *) me;                                 \
+  return obj->GET_LISTENER (_listen_scm_ ## m);                \
+}                                                      \
+                                                       \
+IMPLEMENT_LISTENER (cl, _listen_scm_ ## m)             \
+void                                                   \
+cl::_listen_scm_ ## m (SCM sev)                                \
+{                                                      \
+  Stream_event *ev = unsmob_stream_event (sev);                \
+  protect_event (sev);                                 \
+  listen_ ## m (ev);                                   \
+}
 
-#endif /* TRANSLATOR_ICC */
+/*
+  This helper is only meaningful inside listen_* methods.
+*/
+extern bool internal_event_assignment (Stream_event **old_ev, Stream_event *new_ev, const char *function);
+#define ASSIGN_EVENT_ONCE(o,n) internal_event_assignment (&o, n, __FUNCTION__)
 
+#endif /* TRANSLATOR_ICC */