-bool
-Slur_engraver::try_music (Music *m)
-{
- if (m->is_mus_type ("slur-event"))
- {
- Direction d = to_dir (m->get_property ("span-direction"));
- if (d == START)
- {
- events_[START] = m;
- return true;
- }
- else if (d == STOP)
- {
- events_[STOP] = m;
- return true;
- }
- }
- return false;
+IMPLEMENT_TRANSLATOR_LISTENER (Slur_engraver, slur);
+void
+Slur_engraver::listen_slur (Stream_event *ev)
+{
+ Direction d = to_dir (ev->get_property ("span-direction"));
+ if (d == START)
+ ASSIGN_EVENT_ONCE (events_[START], ev);
+ else if (d == STOP)
+ ASSIGN_EVENT_ONCE (events_[STOP], ev);
+ else ev->origin ()->warning (_f ("direction of %s invalid: %d",
+ "slur-event", int (d)));