Horizontal scroll is flipped

[frivoal]

Is there an existing issue for this?

• I checked and did not find my issue in the already reported ones

Describe the bug

When using the normal/vertical mouse wheel over a slider (or scrolling vertically on a touch pad), the logical (to me) thing happens: scrolling up increases the slider, and scrolling down decreases it. Using the normal/vertical mouse wheel to zoom also does the logical (to me) thing: scroll up zooms in, scroll down zooms out.

However, for horizontal scrolling, the direction is flipped: scrolling left increases sliders, and scrolling right decreases it. That seems backwards. For zooming, it is a little more arbitrary which direction does what, but my intuition also goes the other way around: scrolling left should zoom out, and scrolling right should zoom in, but they do the opposite.

Steps to reproduce

1. Enter darkroom
2. Hover your mouse over a slider, for example: "exposure"
3. (optionally press ctrl+alt if the "mouse wheel scrolls modules side panel by default" is enabled)
4. scroll left

Expected behavior

The value of the slider should decrease

Logfile | Screenshot | Screencast

No response

Commit

No response

Where did you obtain darktable from?

darktable.org / GitHub release

darktable version

5.2.1

What OS are you using?

Mac

What is the version of your OS?

macOS 15.6.1 (24G90)

Describe your system

14" M1 MacBook Pro

Are you using OpenCL GPU in darktable?

None

If yes, what is the GPU card and driver?

No response

Please provide additional context if applicable. You can attach files too, but might need to rename to .txt or .zip

No response

[zisoft]

This depends on your macOS system setting for the scroll direction (system preferences --> mouse --> natural scrolling)

[frivoal]

This depends on your macOS system setting for the scroll direction

Thanks, but that's not it:

• That OS setting only affect touch pad scrolling, not mouse wheel scrolling. The problem I am reporting here is also the case with the mouse (I have a 2d scrolling wheel on my mouse): scrolling right with the mouse on a slider decreases its value. It should increase it.
• That OS setting flips the effect of (touch pad) scrolling vertically AND horizontally. However, I only have an issue in the horizontal direction. In the vertical direction, up means increase, which is what I expect. If I flip the OS setting, that'll fix one axis, but break the other.
• A as opposed scrolling to move a slider or zoom using the scroll wheel, when I actually scroll to scroll (in the lighttable, in file list at the bottom of the darkroom, over the module list…), the scrolling behavior, both with the mouse and with the trackpad, both vertically and horizontally, are as I expect them. Flipping that OS setting would make the trackpad's scroll behavior the opposite of what I want for scrolling, in both axes.

My expected behavior is that scrolling up and scrolling right on a slider (or in order to zoom) should do the same thing, but they don't, they do the opposite.

[Christian-Bouhon]

Hello,
I can confirm that there is indeed a problem with the horizontal sliders.
I have recently been experiencing the same problem with my x-touch MIDI controller. For example, when I want to slightly increase the exposure, the slider goes straight to the maximum and then I can normally reduce and increase it to adjust the exposure.
Have a nice day,
Christian

[dterrahe]

I have recently been experiencing the same problem with my x-touch MIDI controller.

How is this "the same problem"?

Since when have you had this issue? Was it caused by some of the cleanups in bauhaus last week (#19523) or has this been happening longer? FYI I don't seem to have the same issue with my x-touch, so more specific instructions on how to reproduce it could be helpful.

[Christian-Bouhon]

Hello,
I was using the OBS version, and since it wasn't updating anymore, I switched to the AppImage from version 5.3.0+645, and since then I've been having this problem. I'm currently working on 5.3.0+663~g73ced28ae0. This phenomenon occurs on Linuxmint 22.2 and Windows 11.

As it is difficult to explain the phenomenon, here is a short video with a kmidimon screen.
As you can see, it is “erratic.”
On the red channel, I didn't have any problems this time.
On the orange channel, it goes from 1 to 18 in one “click.”
On the green channel, it jumps from 67 to 51, and on the blue channel, it goes directly from 0 to -79% in one click.

The MIDI controller is in its original configuration.

xtouch.mp4

[dterrahe]

I was using the OBS version, and since it wasn't updating anymore, I switched to the AppImage from version 5.3.0+645

So it could be the version update or the switch to AppImage. Could you verify that you have two-way communication with the x-touch? If you switch from an image where one of the sliders is at +100% to one where the slider is at -100% does the "ring" light around the rotor immediately update or does it only change when you physically move it?

[frivoal]

As far as I can tell, the issue reported by @Christian-Bouhon is to be different from the one I initially reported. Maybe it would make sense to open a separate issue for that? Or I can re-open mine as a new issue…

[Christian-Bouhon]

Hello
@frivoal

As far as I can tell, the issue reported by @Christian-Bouhon is to be different from the one I initially reported. Maybe it would make sense to open a separate issue for that? Or I can re-open mine as a new issue…

Sorry, it seemed to me that the bug was similar: if I increased a slider, it would regularly and directly move to the left and then go back up normally.

@dterrahe

If you switch from an image where one of the sliders is at +100% to one where the slider is at -100% does the "ring" light around the rotor immediately update or does it only change when you physically move it?

Indeed, there was a problem on that side. I reset the MIDI controller using the manufacturer's utility, and now everything is working as before. Unfortunately, I don't have an explanation for the cause of the problem, and I thank you for your help.