[PATCH] 8160325: Provide a public API to obtain the FXCanvas for an embedded scene.

Kevin Rushforth kevin.rushforth at oracle.com
Thu Jul 28 16:03:33 UTC 2016


Alexander Nyssen wrote:
> Hi,
> I have added my comments below:
>> Am 28.07.2016 um 17:22 schrieb Kevin Rushforth 
>> <kevin.rushforth at oracle.com <mailto:kevin.rushforth at oracle.com>>:
>> I got the attachment, since Alexander also CCed me directly. I will 
>> attach it shortly.
> Thanks!


>> I do have two comments on this:
>> 1) We are past Feature Freeze, so all Enhancements need formal JDK 9 
>> R-team approval [1][2]. In this case, the justification can be 
>> internal API that is no longer accessible in JDK 9 due to Jigsaw (I 
>> would be very reluctant to consider any other Enhancement request 
>> this late in the process), but I will need to look at it and then 
>> take it through the approval process, provided that I feel it is in 
>> scope.
> I was not aware about this, but I would of course appreciate if it 
> could be included (due to Jigsaw). Thanks for considering it at least.

I'll take a closer look tomorrow or Monday (no more time today). At 
first glance it seems like something reasonable to take forward.

>> 2) Some of the changes you list seem unrelated to this enhancement 
>> and are better done as separate issues (e.g., the rework of the 
>> SWTCursorsTest). Also, I am unconvinced of the need to force GTK 2; 
>> in fact it seems at odds with the work we have done with JEP 283 [3].
> Well, the test case refactoring is somehow related, as I introduced 
> the common SWT rule while introducing the second SWT test. However, I 
> could provide it as a separate contribution if that was wished (and a 
> JIRA issue was provided), but the rest of this contribution of course 
> requires it as a prerequisite. If this enhancement could not be 
> included in JDK 9, I would have to provide it as a separate 
> contribution, as I would have to re-introduce FXCanvasTest in other 
> succeeding bugfix contributions (JDK-8143596, JDK-8143596).

I see. I did take a quick look at this and the test changes seem fine as 
part of this. I see you created the new test with 'hg cp' (or similar) 
which records it as a copy of the SWTCursorsTest.java file, which given 
the number of changes is not needed (and not really useful), but that's 
easy to fix.

There are several white space changes in FXCanvas.java that should be 
reverted. Our policy is that we do not make unrelated changes, including 
white space changes, in portions of a file that aren't otherwise 
modified by a patch.

> The GTK2 flag I introduced just affects SWT. As the swt library that 
> is bundled is rather old (3.7.2) that seemed to be safer (we have 
> observed quite a few problems when running SWT on GTK3). We can of 
> course remove it if tests are not affected by it.

We don't actually bundle swt itself, although we do download an old copy 
to link against, and to run tests against. In any case, given that our 
minimum Linux platform for JDK 9 is Ubuntu 16.04, it might not have GTK2 
installed by default. Please revert this change to build.gradle. If test 
issues arise on Linux we will deal with it at that time (possibly by 
moving to a newer version of swt to run tests).


-- Kevin

>> — Kevin
> Regards,
> Alexander
>> [1] http://mail.openjdk.java.net/pipermail/jdk9-dev/2016-June/004485.html
>> [2]  http://openjdk.java.net/projects/jdk9/fc-extension-process
>> [3] https://bugs.openjdk.java.net/browse/JDK-8145568
>> Phil Race wrote:
>>> The mailing list rejects attachments so we got nothing.
>>> -phil.
>>> On 7/28/2016 8:06 AM, Alexander Nyssen wrote:
>>>> Hi Kevin, all,
>>>> attached please find a patch that fixes JDK-8160325. The patch 
>>>> comprises the following changes:
>>>> - Provided static FXCanvas#getFXCanvas(Scene) method to obtain the 
>>>> FXCanvas instance embedding the given Scene instance.
>>>> - Added EmbeddedWindow.getHost() so the HostInterface can be retrieved.
>>>> - Added FXCanvasTest with a test method to test correct behavior of 
>>>> FXCanvas#getFXCanvas(Scene).
>>>> - Introduced SwtTest JUnit MethodRule to have more concise tests 
>>>> and ensure it is also used by SWTCursorsTest.
>>>> - Ensured SWT tests are executed using GTK2 on Linux.
>>>> I reworked the existing SWTCursorsTest while introducing 
>>>> FXCanvasTest to be more concise.
>>>> Regards,
>>>> Alexander

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