on method

ListenerKiller on(EventListener<P> listener, { bool useHistory = true, ListenerFilter<P>? filter, })

add listener to the current event

use filter to filter this listener

for more information check docs for Event.addListener and Event.addFilteredListener

Implementation

ListenerKiller on(
  EventListener<P> listener, {
  bool useHistory = true,
  ListenerFilter<P>? filter,
}) {
  if (filter == null) {
    return event.addListener(listener, useHistory: useHistory);
  } else {
    return event.addFilteredListener(
      listener,
      filter,
      useHistory: useHistory,
    );
  }
}