Call for testing: Drag and Drop on Linux

Thiago Milczarek Sayao thiago.sayao at
Mon Jun 10 20:53:43 UTC 2019

Hi Kevin,

I will file a JBS with an explanation of the changes and why I did them.

I did a lot of testing on DND on the last days and I have noticed that the GTK3 DND fix that got integrated is not working completely with scenebuilder (may affect other apps). The drag is ok, but when the pointer reach the drop zone it's not detecting the mouse movement properly (it seems). I haven't touched the "drop" code on either patches.

In general I trust more the new patch because it has less #ifdefs and it's more straightforward. But I understand your concerns.

 I will look into it (on the patch that got integrated).

How much time we have until 13 release?


De: Kevin Rushforth <kevin.rushforth at>
Enviado: segunda-feira, 10 de junho de 2019 17:39
Para: Thiago Milczarek Sayao; openjfx-dev at
Assunto: Re: Call for testing: Drag and Drop on Linux

Hi Thiago,

I note that this is a significant change that touches more that just the
Drag and Drop code, so we will need a broader discussion of your
proposed enhancement, as we do with any significant change. Go ahead and
file an Enhancement request so that we have a JBS issue to track this.
Given where we are in the release cycle and the number of other
enhancements under review, this is out of scope for JavaFX 13, but could
be considered for a future release once there is general agreement of
the approach.

One thing I recommend starting with is a high-level overview of the
changes. Also, an evaluation of whether (and how) this change might make
the Glass GTK port easier to maintain going forward would be helpful.


-- Kevin

On 6/10/2019 10:15 AM, Thiago Milczarek Sayao wrote:
> Dear Linux Users,
> I did some modifications on DND to work better with Linux:
> Benefits:
>    *   Works on wayland
>    *   Works across gtk2 and gtk3 with little code differences
>    *   Works on scenebuilder (with gtk3 - currently it falls back to gtk2)
>    *   Will be easier to port to GTK4 when it's default (may take some time).
> I have tested on Ubuntu 16.04, 18.04 and 19.04.
> Please, give feedback on the Pull Request.
> On the source there are two test apps included (tests/manual/dnd).
> Can be also tested with scenebuilder (which uses drag and drop):
>    *   Clone de source
>    *   Build: gradlew build
>    *   Run:  java --module-path <PATH TO OPENJFX SOURCE>/openjdk-jfx/build/sdk/lib --add-modules javafx.web,javafx.fxml,javafx.swing, --add-opens=javafx.fxml/javafx.fxml=ALL-UNNAMED -cp app/build/libs/scenebuilder-11.0.0-SNAPSHOT.jar

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