Question: Is smooth scrolling available out of the box?

[Chris2011]

The headline says it all: Is there a smooth scrolling feature which comes with the FlatLaf out of the box? When I use NetBeans with a nb-darcula theme for example the scrolling jumps to a specific number of rows. It is fixed. This features was implemented into NetBeans (one specific LaF) out of the box. It would be nice, if the FlatLaF will have it, if not :)

Cheers

Chris

[DevCharly]

No, smooth scrolling is not (yet) available.

I'll have a look...

• https://issues.apache.org/jira/browse/NETBEANS-49
• [NETBEANS-49] Avoid large scroll pane jumps on Windows apache/netbeans#881
• http://mail.openjdk.java.net/pipermail/awt-dev/2017-January/012507.html

[Chris2011]

Thx for the info :)

[DevCharly]

implemented in 0.24
(coming to NetBeans soon with my next PR)

[Chris2011]

Awesome :). Thank U so much. Will like to test it out

[bobbylight]

I tried 0.25.1 out today, and smooth scrolling isn't working for me, though it does work in IntelliJ. I see your implementation looks different than that used in IntelliJ. For me, this part of the conditional is not being met, thus I'm falling back to regular scrolling:

e.getPreciseWheelRotation() != e.getWheelRotation() )

Why is this particular condition there (or more generally, how is it derived from the other implementations linked here and elsewhere? Is there some mouse/OS setting I need to enable somewhere?

Kudos on getting a feature like this into the LaF - it's little things like this that really help the fidelity of Swing applications.

[DevCharly]

Why is this particular condition there

This conditions simply checks whether the mouse has a high-resolution wheel.
If not, regular scrolling is used.

FlatLaf (currently) supports "smooth scrolling" only with high-resolution wheels or trackpads.
Maybe "smooth scrolling" is the wrong term, but with high-resolution wheels or trackpads it seems to scroll smooth because many many wheel events are fired when you (slowly) rotate the wheel, which means many repaints...

IntelliJ on the other hand seems to have some smooth scrolling for non-high-resolution wheels too.

While scrolling in IntelliJ looks smooth even with non-high-resolution wheels, you can not scroll e.g. half a line when you rotate very slowly. It scrolls always 3 lines (on Windows), but does some repaints to make it feel smooth.

With a high-resolution wheel or trackpads you can scroll pixelwise...

Is there some mouse/OS setting I need to enable somewhere?

Good question. I don't know.
But it seems that on Windows this is a OS/driver problem.
I have a mouse that supports high-resolution on macOS, but not on Windows.
Maybe smooth scrolling has to be enabled somewhere in Windows? Or a special mouse driver is needed?

[bobbylight]

Thanks. I looked around and couldn't figure out to enable smooth/enhanced scrolling with my mouse. Just wondering if you were aware of some Windows setting that worked for all/most users.

[DevCharly]

Just wondering if you were aware of some Windows setting that worked for all/most users

No, sorry.

Maybe it is necessary to install additional software from the mouse vendor?