Problem restoring applet focus

As an exercise I wrote a Tetris clone in Swing. The game itself is fine, and runs without problems when run standalone in a JFrame. Next, I tried making an applet version of the game. Mostly the same code, just wrapped inside of a JApplet instead of a JFrame. Here's where the problems started.
The applet version seems to run fine in Firefox as long as you do not open a new tab, or click on another already-opened tab. If you go to another tab, then back to the applet's tab, and try clicking on the applet, focus is never regained (or so it seems - the applet no longer responds to keypresses).
In other words:
1. I load the applet in a new tab in Firefox. I can click on the game and play it like I'd expect.
2. I click on some other tab I already have open.
3. I click back on the Tetris applet's tab.
4. I click on the applet and try to start playing again. The applet doesn't respond to any keypresses, no matter how hard I try.
What am I missing here? Hopefully this sounds familiar to somebody. I would post some code but the game is made up of several source files, and I was hoping someone would spot the obvious for me just from a description.
FWIW, using IE7 and Safari, things work as expected - I can switch tabs, then come back and play the game fine. (Although with Safari, sometimes I really have to work to get the applet focus in the first place, but I think that's a different issue).
Thanks for any help!

thorsti16 wrote:
Hi,
i have a similar focus problem. After a click of a Tab and back the focus for keyboard is gone.
I use a shell which has embedded th IE control. My applet has no such problems with jre 1.4.2_10 and older vms.
Which jre version do you use?On Windows it was 1.6.0_03. On OS X, 1.5.0_07. On Fedora Linux, I'm not sure, but it was some release of 1.6. With all three configurations, Firefox had this problem.
Could you please check your applet with 1.4.2_10 ? Perhaps we are facing the same problem.
thorstenUnfortunately my code uses Java 5 features, so I can't test with 1.4.x. I might "backport" to 1.4 just to see if things work that way. But I think I found a solution. Try something like this in your applet's init() method:
applet.setFocusable(false);
gamePanel.setFocusable(true);
gamePanel.setFocusCycleRoot(true);where above, "gamePanel" is the JPanel (or whatever) you added to the applet's content pane, that renders the game, etc. With this code, the "switching tabs" problem is fixed for me on both Windows and OS X. I haven't tested on Fedora yet; when I do I'll post back with the results.
So try the above if you can, and post back with whether it works for you! I suppose if gamePanel is not a java.awt.Container subclass (i.e. if you use java.awt.Canvas), you won't have a setFocusCycleRoot() method to call, but you might not need it in that case. Not sure, haven't tested that either...

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