<AWT Dev> [8] Review request for 7124376: [macosx] Modal dialog lost focus

Anthony Petrov anthony.petrov at oracle.com
Fri Apr 27 11:01:05 PDT 2012

On 4/27/2012 9:53 PM, Leonid Romanov wrote:
> 1. Yep, I've verified whether my solution works for AWT and indeed it does: returning NO from canBecomeMain/KeyWindow does prevent OS from bringing window to the front. Wonder why it doesn't work for FX.  The thing is, if we allow OS to bring blocked window to the front, even for a fraction of second required to restack window back, then user would see window jumping forth and back in z-order, and this is something we want to avoid. 

Please try clicking the title-bar of a blocked window, not its content 
area. Does it still not jump to the front?

Perhaps Apple fixed this in 10.7, but on my old 10.6.8 system the 
canBecome-NO windows did go to the top of the stacking order when being 

Note that the restacking is unnoticed since in FX it's performed during 
the windowDidBecomeKey event processing. If we postpone this operation, 
then indeed, some flickering will be visible.

best regards,

> 2. I need to check on this. Thanks for pointing it out.
> Leonid.
> On 27.04.2012, at 21:39, Anthony Petrov wrote:
>> Hi Leonid,
>> I was thinking of implementing a similar mechanism in order to fix 7124395. Please see the Comments section in that bug for some additional details.
>> Regarding the fix itself:
>> 1. Even though you return NO from canBecomeMain/KeyWindow, the OS will still bring the window to front of the z-order when you click it. In FX we handle this by always returning YES from canBecome* methods, however, the windowDidBecomeKey: sends a special FOCUS_DISABLED event if the window is blocked. In that case the upper level code re-stacks windows so that the blocker window always appears on the top of the z-order. Have you verified if this works fine for AWT apps with your fix?
>> 2. Also, we just don't send mouse events for blocked windows from native code to Java. Is this handled somewhere else for modally blocked windows in lwawt?
>> --
>> best regards,
>> Anthony
>> On 4/27/2012 6:11 PM, Leonid Romanov wrote:
>>> Hi,
>>> Please review a fix for 7124376: [macosx] Modal dialog lost focus. One can easily reproduce this bug by launching SwingSet2, choosing JOptionPane demo and then clicking "Show Message Dialog" button. Now, click on the "SwingSet2" window title bar and you'll see the window rapidly gaining and loosing focus.
>>> Bug:  http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=7124376
>>> webrev: http://cr.openjdk.java.net/~leonidr/7124376/webrev.00/
>>> Thanks,
>>> Leonid.

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