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Detecting switch to application



Greetings,

I'm working on an application with a main window that is supposed to
work like the buddy-list windows in iChat or Skype.  That is, the
buddy-list window can be closed (leaving no open windows). Later, when
the user switches back to my application, the buddy-list automatically
reopens itself.

Does a Java application receive any notification that the user has
switched to it (using command+tab or the dock)?  And furthermore, is
it possible to detect this notification when there are no open
(visible) windows?

In the MRJ era, I used to create a secret window beyond the physical
screen which would come to the top when no other windows are open.
That window mainly served to hang a menu-bar from, but it also served
to detect application-switch events.  Is that still the way to do it
in 2007?

Thanks,

Eric Smith
Tarkvara Design Inc.
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