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  Applet Lifecycle  (Read 408 times)
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Offline Alan_W

JGO Knight


Medals: 8
Projects: 3


Java tames rock!


« Posted 2013-03-04 06:10:22 »

Applets don't seem to stop on Safari when I navigate away from the page.  isActive() remains true and stop() is not called.  If the tab is closed, then stop() does get called then.

Haven't checked to see if this is generic or Safari specific.  I thought the whole idea of start and stop was to suspend the applet when it isn't being displayed.  I'm noticing because my sound generation isn't stopping, and as this is actively driven by the game thread.

There is a demo applet on the oracle website at
http://docs.oracle.com/javase/tutorial/deployment/applet/lifeCycle.html
This prints out debug info
You need to have the console open to see what's going on.

I expected to get a stop() when navigating away from the page and a start if the page is redisplayed.  I thought that destroy() would be called to unload resources.  However I only get stop() when the tab is closed.  Is there a way to determine whether an applet is currently displayed?

Time flies like a bird. Fruit flies like a banana.
Offline jonjava
« Reply #1 - Posted 2013-03-04 06:33:49 »

Hmm, maybe the isFocusOwner() method?


Offline Alan_W

JGO Knight


Medals: 8
Projects: 3


Java tames rock!


« Reply #2 - Posted 2013-03-04 19:38:23 »

Good idea; It would work for muting sound when the applet doesn't have the focus.
However the applet doesn't start with the focus.  I suppose one could have a special case where sound is on at the start and only disabled when focus is lost.

Annoyingly the applet doesn't get the focus back if I tab away and then back again.  Maybe I could do something with Javascript and call into the Applet to let it know whats going on.

Edit: javascript document.hasFocus() looks possible.

Time flies like a bird. Fruit flies like a banana.
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