<Swing Dev> [JDK-8178430] JMenu in GridBagLayout flickers when label text shows "..." and is updated
krishna.addepalli at oracle.com
Mon Nov 6 15:32:23 UTC 2017
As per your recommendation I have done the following changes:
1. Moved the fix to BasicMenuUI.
2. Corrected the test to:
a. Access the UI elements only in the EDT.
b. Made sure that the main thread doesn't exit till the test is complete.
Here is the updated webrev: http://cr.openjdk.java.net/~kaddepalli/8178430/webrev02/
However, I was wondering, why it is good to fix in BasicMenuUI? Also, while writing the testcase, I couldnot find any functionality like "flush" on the event queue, which will execute all the pending events. Is it by design?
From: Sergey Bylokhov
Sent: Friday, November 3, 2017 11:24 PM
To: Krishna Addepalli <krishna.addepalli at oracle.com>; swing-dev at openjdk.java.net
Subject: Re: <Swing Dev> [JDK-8178430] JMenu in GridBagLayout flickets when label text shows "..." and is updated
A few notes:
- Looks like the bug can be reproduced in JMenu only? Then it will be good to fix it in BasicMenuUI, moreover it is already implemented a
getMaximumSize() in a similar way as in your fix.
- In the test some of the Swing components are accessed on non-EDT thread. Also note that when you start the Thread you will exit
invokeAndWait() and it is possible that the test will end before the Thread complete(jtreg will kill the test when the main thread is completed)
On 31/10/2017 05:00, Krishna Addepalli wrote:
> Hi Sergey,
> Thanks for pointing that out. Fixed the test case and created a new
> webrev here: http://cr.openjdk.java.net/~kaddepalli/8178430/webrev01/
> Now, the testcase throws an exception and also after a few trials, closes on its own.
> -----Original Message-----
> From: Sergey Bylokhov
> Sent: Tuesday, October 31, 2017 1:13 AM
> To: Krishna Addepalli <krishna.addepalli at oracle.com>;
> swing-dev at openjdk.java.net
> Subject: Re: <Swing Dev> [JDK-8178430] JMenu in GridBagLayout
> flickets when label text shows "..." and is updated
> Hi, Krishna.
> Can you please clarify in what situation the test will stop working(it does not have any assertions)?
> On 27/10/2017 02:45, Krishna Addepalli wrote:
>> Hi All,
>> Please review the fix for bug:
>> Bug: JDK-8178430: https://bugs.openjdk.java.net/browse/JDK-8178430
>> Webrev: http://cr.openjdk.java.net/~kaddepalli/8178430/webrev00/
>> The issue is when the label text width is more than the
>> container(JPanel) width, the container tries to render with minimum
>> width for all the components. In such case, the JMenuItem, which is
>> added to the JMenuBar also returns its height dimension as 1 (the
>> default minimum). The test case alternates between the short text and
>> long text on the label, and it gives a flickering effect of the Menu.
>> The fix is to return preferred size from JMenuItem, if its parent is
>> a JMenuBar, since JMenuBar is added to the top level window.
> Best regards, Sergey.
Best regards, Sergey.
More information about the swing-dev