Bug report - scrollbar behavior when using laptop trackpad two finger scroll down is weird

[Hoanui]

As the topic title says, when I use my laptop trackpad to try and scroll down with two fingers in Mulab (for example, when I am trying to scroll through a list of modules), Mulab responds with movements on the scroll bar that do not correspond to what I am trying to do with the trackpad.

If I scroll down softly, Mulab scrolls upwards. If I scroll down hard, Mulab initially scrolls down, but then starts scrolling back up.

This only happens if I am trying to scroll down, when I scroll up, Mulab responds properly.

Info:

Mulab 8.7.6
Windows 10 Home
ASUS X541UV Laptop

[jamiethelin]

+1 I've had the same issue on a Surface Pro 4.

[dakkra]

Trackpads that use non-linear scroll events have issues with Mulab. Macbooks, Dell XPS, and many other "inertia" scroll drivers exhibit this issue.

[MuTools]

What are non-linear scroll events? Do you have more info / links on this?

[dakkra]

https://en.wikipedia.org/wiki/Scrolling#UI_paradigms

Many applications these days are built for both kinetic and inertial scrolling. Here's a video I made explaining how these are non-linear at times:



I hope this makes sense.

Edit:

The rough idea is that faster swipes = faster scrolls when using inertial scrolling, but agnostic when using kinetic scrolling. Think of it like scrolling on a smartphone. Flicking the screen does inertial scrolling with speed depending on how fast you flick the screen (non linear), but dragging is a linear change (like a scroll wheel) as you're simply "panning" the screen.

Edit No. 2:

https://stackoverflow.com/questions/297 ... in-java-fx

This goes over the idea of setting a zoom/scale factor

[MuTools]

Thx for the info Dakkra.

Note that MuLab does not yet support gestures, and thus such 2 finger actions are unsupported.
I also don't see anything about this in the official WM_MOUSEWHEEL info from Microsoft.

Can you guys please confirm that single finger actions work as expected.

[dakkra]

Ah you're doing OS-level hooks. This may be of use: https://docs.microsoft.com/en-us/window ... scrollbars

On Windows I've had no issues with single finger gestures. I've only ever had issues with multi-finger gestures on Windows (I wish I could test in depth but I've given away my Windows laptop to a friend as my work provided me with my own MacBook).

Edit: My apologies if I'm over stepping, just trying to help provide information and help

[MuTools]

Thx

[Hoanui]

Yeah, I have no single finger issues with my trackpad on mulab.

[MuTools]

Ok, good to hear. I'll leave it as is now. Please don't use multi-touch yet in MuLab as it's not yet supported. I'm interested to research it later at appropriate time.

[Kalamata Kid]

From a Google search:
Does Windows 11 have a Tablet mode?
In fact, Microsoft decided to jettison the notion of a Tablet mode completely. In Windows 10, you can explicitly set a device to Tablet mode, but with Windows 11, that choice is gone. Instead, PCs automatically switch to a more touch-friendly mode once you remove the keyboard.

See my setup: viewtopic.php?f=4&t=7760&p=7777146#p7777146. I will have a major issue with Windows 11 as I like to use multi-touch, mouse and qwerty keyboard at the same time.

For me it is essential that the plugins need to be multi-touch. Yea the DAW too would be great if it is also multi-touch. In my case the DAW in on a non-touch screen. A single touch would be fine.

BTW my 23” Viewsonic TD2340, 10 touch monitor no longer is touchable. It may be Windows 10 update that killed it.