Re: Custom Listeners, yes, but why custom Events?
Leo Breebaart <email@example.com> writes:
Am I missing some very obvious advantage to the FooEvent
Posted events get queued in the time-ordered event queue,
while e direct call might be out of order.
When Swing calls a listener, the listener can be sure to
run in the EDT, which is not obvious, when a listener is
A GUI object usually accepts an arbitrary number of
listeners for certain kinds of events at run-time and then
notifies them of the events. This can not be accomplished
with hard-coded calls of specific methods. The binding is
more loose with events than with calls.
Swing might merge certain events in the event queue into
a single event IIRC, so posted events are not mapped 1:1
to calls of event listeners.
Other event processors might possibly be added, such as
macro recorders / macro replayers. They will only record
events, but miss direct calls.
Those were just things that immediatly came into my mind,
I might have missed others.