<AWT Dev> [9] Review request for 8163101: dual-screen issue with JMenu, JPopupMenu

Sergey Bylokhov Sergey.Bylokhov at oracle.com
Mon Nov 7 15:53:55 UTC 2016

On 07.11.16 18:37, Semyon Sadetsky wrote:
>> This is the question why it is unsupported, since Unity can set
>> different dpi per screen.
> It doesn't work. It only scales the Unity top panel and the launcher.
> Apps windows have always the same scale equals to the main screen scale.

There is an option to scale the size of the window to the biggest or 
smallest scale of the screen, which is not necessary the main screen But 
this is unrelated to this fix.

>> But this is unrelated. We support a different GraphicsDevice per
>> screen, each device should have its own scale(even if it is the same
>> value). The code which operates on screen bounds should use its own
>> graphics device.
> Nope. Java does not support different scales for monitors. Attempt to
> set them different when Xinerama is used will cause unpredictable behavior.

This is unrelated, the code should depends on bounds/scales/etc from 
device where the popup or window are located.

>>>>> I proposed to do same to investigate the problem. Does it mean that
>>>>> you
>>>>> approve the current fix?
>>>> No, this is one is a separate bug. and I already described why.
>>> But do you have any other concerns to the current fix?
>> The code in question should use the bounds of the screen where the
>> component is located, not a bounds of the main screen.
>>>>> But severity of this bug is rather low because it is internal problem
>>>>> that does not affect user experience. It may be deferred to the next
>>>>> major JDK release.
>>>>> Also note, that the same bug was already closed as "won't fix" before:
>>>>> https://bugs.openjdk.java.net/browse/JDK-5100801
>>>>> --Semyon

Best regards, Sergey.

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