-void
-Translator::connect_to_context (Context *c)
-{
- for (translator_listener_record *r = get_listener_list (); r; r=r->next_)
- c->events_below ()->add_listener (r->get_listener_ (this), r->event_class_);
-}
-
-void
-Translator::disconnect_from_context (Context *c)
-{
- for (translator_listener_record *r = get_listener_list (); r; r=r->next_)
- c->events_below ()->remove_listener (r->get_listener_ (this), r->event_class_);
-}
-
-static SCM listened_event_class_table;
-void
-ensure_listened_hash ()
-{
- if (!listened_event_class_table)
- listened_event_class_table = scm_permanent_object (scm_c_make_hash_table (61));
-}
-
-
-LY_DEFINE (ly_get_listened_event_classes, "ly:get-listened-event-classes",
- 0, 0, 0, (),
- "Returns a list of all event classes that some translator listens to.")
-{
- ensure_listened_hash ();
- return ly_hash_table_keys (listened_event_class_table);
-}
-
-LY_DEFINE (ly_is_listened_event_class, "ly:is-listened-event-class",
- 1, 0, 0, (SCM sym),
- "Is @var{sym} a listened event class?")
-{
- ensure_listened_hash ();
- return scm_hashq_ref (listened_event_class_table, sym, SCM_BOOL_F);
-}
-
-void
-add_listened_event_class (SCM sym)
-{
- ensure_listened_hash ();
- scm_hashq_set_x (listened_event_class_table, sym, SCM_BOOL_T);
-}
-
-
-/*
- internally called once, statically, for each translator
- listener. Connects the name of an event class with a procedure that
- fetches the corresponding listener.
-
- The method should only be called from the macro
- IMPLEMENT_TRANSLATOR_LISTENER.
- */
-void
-Translator::add_translator_listener (translator_listener_record **listener_list,
- translator_listener_record *r,
- Listener (*get_listener) (void *),
- const char *ev_class)
-{
- /* ev_class is the C++ identifier name. Convert to scm symbol */
- string name = string (ev_class);
- name = replace_all (name, '_', '-');
- name += "-event";
-
- SCM class_sym = scm_str2symbol (name.c_str ());
-
- add_listened_event_class (class_sym);
-
- r->event_class_ = class_sym;
- r->get_listener_ = get_listener;
- r->next_ = *listener_list;
- *listener_list = r;
-}
-
-/*
- Used by ADD_THIS_TRANSLATOR to extract a list of event-class names
- for each translator. This list is used by the internals
- documentation.
-*/
-SCM
-Translator::get_listened_class_list (const translator_listener_record *listeners) const
-{
- SCM list = SCM_EOL;
- for (; listeners; listeners = listeners->next_)
- list = scm_cons (listeners->event_class_, list);
- return list;
-}
-