Missed "pulse"?

Richard Bair richard.bair at oracle.com
Wed Jul 31 07:58:16 PDT 2013

Jim just fixed "RT-30223, RT-30826, RT-31044 - Canvas clears clip on Windows/D3D". If you are on Windows and seeing things are drawing that should be clipped, it might be related to one of these fixes. He's trying to get the fix into the 2.2 line as well as in 8. I only considered just now that this might be what you are seeing.


On Jul 31, 2013, at 7:42 AM, Scott Palmer <swpalmer at gmail.com> wrote:

> Interesting. The problem outlined in RT-31025 does involve GridPane with
> ColumnConstraints.  I will try to dig up the code.
> Scott
> On Wed, Jul 31, 2013 at 4:47 AM, Diego Cirujano-Cuesta <
> diego.cirujano-cuesta at zeiss.com> wrote:
>> Hi Scott,
>> I have a component quite similar to the one you described and I also had
>> problems like the ones that you mentioned with the same workarounds. BUT I
>> found out that the problem was of my understanding. One of the problems
>> was, I was using invalidation listeners and I wasn't getting always the
>> value and another problem was a gridPane with column constraints.
>> I had a look deeply and I fix them, now they work perfect.
>> I saw in Jira you sent your code to Eva. If you want, you can send me the
>> problem also(with the isolated code) I can have a look or much better, Eva
>> could publish the code in Jira. I am interested.
>> Regards,
>> Diego
>>> (I'm talking JavaFX2.x, but this happens in 8 as well.)
>>> In my application I occasionally see a situation where the rendering
>> doesn't jive with what it should. For example I have implemented my own
>> scroll pane (ironically enough I did this to workaround manifestations of a
>> problem similar to what I am about to describe in the stock ScrollPane)
>> using clipping and translations, but sometimes I see the clipped content at
>> the wrong location. So my clipped content is offset from the edge of my
>> pane, or rendered over top of things outside my pane, even though it is
>> impossible for the clipping and translating to not be set together.  If I
>> mouse over the offending area it suddenly snaps to the way it should be
>> (CSS rules on the content would have forced it to redraw).
>>> In other situations, I may need to coax a proper rendering of certain
>> layouts by nudging the size of something to force another layout.
>>> Obviously things should just paint correctly the first time.  In these
>> situations, the variables appear to be set to the correct values, but
>> somehow that didn't get to the screen.
>>> I'm not certain, but I suspect I might be able to work around these issues
>> if I could force a "pulse" or mark things as dirty some way to trigger one.
>> The thing is, there doesn't seem to be a publicly accessible way to do
>> this, presumably because it isn't supposed to be necessary in the first
>> place.
>>> Platform.runLater(... requestLayout ...) was one workaround that I started
>> to use, in the cases where things were particularly bad, but it isn't the
>> sort of things I want to have to scatter throughout my code..
>>> With recent testing on JavaFX 8 I had to remove some of my workarounds
>> because they caused a stack overflow doing layout. In requestLayout, I
>> would call requestLayout directly on some specific child nodes (without a
>> runLater) that seemed to misbehave - somehow this got back to call
>> requestLayout again in my class and a quick attempt to break the cycle
>> didn't work.
>>> I'm sure you can appreciate the frustration in trying to ship a
>> professional quality application with this sort of instability in the
>> rendering system.
>>> Since I suspect these issues aren't going to be fixed before 7u40 ships,
>> and 8 is a long way off, what is the best thing to do?  I have already
>> filed bugs for issues in a few specific cases. E.g.
>> RT-31025<https://javafx-jira.kenai.com/browse/RT-31025> (In
>> some cases from a long time ago I was unsure if I was doing something wrong
>> so I may not have isolated things into a test case and reported a bug.)
>>> Regards,
>>> Scott
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