Sets a callback that is called whenever no events are left in the event queue.
The callback delegate is called whenever all events in the event queue have been
processed. Returning true from the callback will cause another idle event to
be triggered immediately after processing any events that have arrived in the
meantime. Returning false will instead wait until another event has arrived first.
Sets a callback that is called whenever no events are left in the event queue.
The callback delegate is called whenever all events in the event queue have been processed. Returning true from the callback will cause another idle event to be triggered immediately after processing any events that have arrived in the meantime. Returning false will instead wait until another event has arrived first.