Resolved XR Interaction Toolkit no Scroll Handling implementation?

I noticed that when interacting with UI using the XR Interaction Toolkit that it doesn't seem to have any mechanism for Scrolling through content using the primary 2D Axis.
I can create a workaround that gets the feature value every frame and send it to the scroll handler manually. But it would be nice if this were implemented in the input module as event driven change.
The mouse scroll is negating the scroll every frame as well. This causes the scroll rect to not scroll at all.

I tracked down the issue with the mouse scroll events not working when using Mouse input.
The MouseModel has 2 properties, scrollPosition and scrollDelta.
The scrollPosition is being set to the Input.MouseScrollDelta
The ScrollHandler uses the scrollDelta property which is set by the scrollPosition property

scrollDelta = value - m_ScrollPosition;

.
if frame 0 the scrollPosition is (0, -1) then the next frame (0, 0) the scrollDelta will be 1. Negating the scroll in the ScrollHandler that has been performed previous frame.

I added the XR Scrolling myself and fixed the mouse scrolling while I was at it.
for XR Scrolling I added to the UIInputModule

Code (CSharp):

1.                 // Get XR Device
2.                 var rightHand = InputDevices.GetDeviceAtXRNode(XRNode.RightHand);
3.                 if (rightHand.isValid && rightHand.TryGetFeatureValue(CommonUsages.primary2DAxis, out var scrollDelta))
4.                     eventData.scrollDelta = scrollDelta;
5.                 else
6.                     eventData.scrollDelta = Vector2.zero;

and calling

ProcessMouseScroll(eventData);

For fixing the MouseScroll I changed the

CopyTo

method of the

MouseModel

changed eventData.scrollDelta = scrollDelta;

to

eventData.scrollDelta = scrollPosition;

Bit of a hacky workaround but yeah it does the trick.


TLDR for Mouse Scrolling Issue.
In the original StandaloneInputModule the ScrollDelta is set directly with Input.MouseScrollDelta
in the MouseModel used by the XRUIInputModule it calculates the delta based on a previous frame. Which causes this issue.
Filed a bug report case 1278162

TLDR for XR scrolling
Scrolling using a controller left or right stick isn't even implemented. Only for the mouse and even that is bugged.

 

Where did you add the XR Scrolling code pasted above in UIInputModule.cs? I'm stuck on this issue, too. Thanks!

 

I updated the XR package. Don't think I have re-added it to the new update yet.
Basically how I did it before was:
- Get the Left / Right hand controller
- Get the Secondary2DAxis value
- Apply that as eventData.scrollDelta value

 

Thank you - so I am using the newest preview package, and I understand the issue, but couldn't quite find where that code would go. Any time I try to get any sort of Mouse Input I get an error stating that the new Input system prohibits use of the old one.

 

I haven't really used the new input system yet due to the fact that other packages relied on the old input system.
The newest version of the XR interaction should be able to use the new input system. So you can probably set the eventData.scrollData with that. But I don't know how yet as I've only used the new input system a long time ago and only for a day.

 

I've send requests to the roadmap already but I am uncertain whether they get received or not.

 

Any estimated time for this feature? Thanks.