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10.11.3 Listening to music events
External interfaces to the engraver are implemented by protected macros including one or more of the following:
-
DECLARE_TRANSLATOR_LISTENER (event_name) -
IMPLEMENT_TRANSLATOR_LISTENER (Engraver_name, event_name)
where event_name is the type of event required to provide the input the engraver needs and Engraver_name is the name of the engraver.
Following declaration of a listener, the method is implemented as follows:
IMPLEMENT_TRANSLATOR_LISTENER (Engraver_name, event_name)
void
Engraver_name::listen_event_name (Stream event *event)
{
...body of listener method...
}