[brailleblaster] Re: How do I get this notifyListeners addListener to work
- From: "John J. Boyer" <john.boyer@xxxxxxxxxxxxxxxxx>
- To: brailleblaster@xxxxxxxxxxxxx
- Date: Thu, 16 Jun 2011 11:13:27 -0500
Dick,
Thanks. This might help me understand the event-listener mechanism.
John
On Thu, Jun 16, 2011 at 09:50:29AM -0500, Richard Baldwin wrote:
> See http://www.dickbaldwin.com/java/Java080.htm and the next three or four
> lessons following lesson 80 at http://www.dickbaldwin.com/tocmed.htm for
> more information on the Java source-listener event model.
>
> Dick Baldwin
>
> On Thu, Jun 16, 2011 at 9:27 AM, Susan Jolly <easjolly@xxxxxxxxxxxxx> wrote:
>
> > There are two actors involved in listening: the listener and the what I'll
> > call the broadcaster. GUI components have built-in logic to broadcast
> > certain events in response to certain user actions. MenuItems, for example,
> > have logic to broadcast the event that they've been selected. Other GUI
> > components have logic to broadcast other types of events.
> >
> > When an object registers itself as a listener for an event it does this by
> > asking an appropriate GUI component to add it as a one of its listeners for
> > a specific type of event. This only works if that GUI was already set up to
> > broadcast that event. A GUI's API will tell you what events it is designed
> > broadcast.
> >
> > HTH,
> > Susan
> >
> >
>
>
> --
> Richard G. Baldwin (Dick Baldwin)
> Home of Baldwin's on-line Java Tutorials
> http://www.DickBaldwin.com
>
> Professor of Computer Information Technology
> Austin Community College
> (512) 223-4758
> mailto:Baldwin@xxxxxxxxxxxxxxx
> http://www.austincc.edu/baldwin/
--
John J. Boyer; President, Chief Software Developer
Abilitiessoft, Inc.
http://www.abilitiessoft.com
Madison, Wisconsin USA
Developing software for people with disabilities
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