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font display issues with mars/centos6 [message #1707229]

Thu, 03 September 2015 08:02

Vlad Gheorghe

Messages: 127
Registered: May 2011

Senior Member

Hello,

We have the following setup:
Eclipse Mars 4.5
GTK version 2.18.9
CentOS 6

With this configuration, the drop-down lists contain garbled text, probably when there are more elements than can be displayed without scrolling.
Please see attached image.

Can anyone please recommend a fix or work-around ?

Best regards
Vlad Gheorghe

Attachment: GTK_ISSUE.png
(Size: 124.12KB, Downloaded 207 times)

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Re: font display issues with mars/centos6 [message #1707317 is a reply to message #1707229]

Thu, 03 September 2015 16:39

Eclipse User

I've seen oddities like that when an exception has occurred when building up the menu content

Does it happen on all popup menus, or just this particular menu?

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Re: font display issues with mars/centos6 [message #1707409 is a reply to message #1707317]

Fri, 04 September 2015 14:41

Andreea Pintea

Messages: 5
Registered: September 2015

Junior Member

Hi Brian,

It seems that no exception occurs in our case. This happens on all drop-down lists that
surpass a specific size (in this case more than 13 items).
Can you give us some hints regarding a potential fix for this?

Thank you !
Best Regards,

Andreea Pintea

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Re: font display issues with mars/centos6 [message #1708118 is a reply to message #1707409]

Mon, 14 September 2015 02:04

Eclipse User

Andreea,

Does this happen within the Eclipse IDE? If no, then there's something specific to your app.

In the case I described, it happened on most context menus. In trying to track the cause down, I discovered that the actual exception was caught and never actually logged: I stumbled across it by accident. Look at your code for dynamic menu builders (e.g., the org.eclipse.ui.menus <dynamic>).

If it happens within the IDE too, then try building a small standalone example that demonstrates the problem, ideally something using just pure SWT. You can build something pretty quickly in WindowBuilder.

Brian.

[Updated on: Mon, 14 September 2015 02:04] by Moderator

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Re: font display issues with mars/centos6 [message #1708429 is a reply to message #1708118]

Wed, 16 September 2015 12:39

Andreea Pintea

Messages: 5
Registered: September 2015

Junior Member

Hi Brian,

I do not manage to reproduce this in Eclipse IDE, so it it definitely an issue of the application.
However, i have discovered that this issue happens only with Combos that have the SWT.READ_ONLY constant set to TRUE.
It seems to be some conflict between this setting and the scrolling option of the Combo.
Therefore after applying SWT.NONE to the concerned combo, the scrolling becomes possible and the issue is solved.

Andreea

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Re: font display issues with mars/centos6 [message #1708451 is a reply to message #1708429]

Wed, 16 September 2015 15:41

Eclipse User

Could you try to put together a small testcase using just plain SWT to reproduce your issue? And then please open a bug against SWT as SWT.READ_ONLY is a valid bit for a Combo.

Thanks!

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Re: font display issues with mars/centos6 [message #1708669 is a reply to message #1708451]

Fri, 18 September 2015 14:28

Andreea Pintea

Messages: 5
Registered: September 2015

Junior Member

So far i have not succeeded in reproducing this issue in an isolated context. Regular Combos with this flag set, work fine in a separate application.
Of course, in case this proves to be an SWT issue, i will open a bug.

Thank you for your support!

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Re: font display issues with mars/centos6 [message #1710010 is a reply to message #1708669]

Fri, 02 October 2015 15:37

Andreea Pintea

Messages: 5
Registered: September 2015

Junior Member

Hi Brian,

I have found the cause of our troubles. It seems that the default ViewerComparator that we use to sort the items makes them "overlap". Therefore i believe it is a JFace bug. I attatch the code. What do you think?

Best regards,

Andreea Pintea

Attachment: ViewerComparatorIssue.zip
(Size: 7.33KB, Downloaded 117 times)

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Re: font display issues with mars/centos6 [message #1710034 is a reply to message #1710010]

Fri, 02 October 2015 19:04

Eclipse User

Just eyeballing the code, it looks ok to me. I can't imagine how the ViewerComparator makes a difference, but please submit a bug on SWT and report the bug number here!

https://bugs.eclipse.org/bugs/enter_bug.cgi?product=Platform&component=SWT

Brian.

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