Question mouse wheel on scrollViews very slow with Unity 2021.1.x

I updated our project from Unity 2020.3. to Unity 2021.1.
Here I changed the eventhandling from UIToolkits own EventSystem to the standard one.

Then I discovered that scrolling in ScrollViews with the mouse wheel is much slower then it was before.
In UGUIs ScrollRect there is the Paramater "Scroll Sensitivity" with which that can be changed there.
But is there a way to do that for UIToolkits ScrollView as well?

 

That does the trick, thx

 

I have the same Problem, i only can scroll very slow in the ScrollView from UIToolkit. Sadly for me the scroll sensitifity is not changeing when i take a higher value (for example 50) at Vertical Page Size. Does someone know why? Did anything change in an Update?

 

There doesn’t seems to be a consensus on this. There is a supposed solution but it doesn't work for everyone. I reported the bug.

https://forum.unity.com/threads/listview-mousewheel-scrolling-speed.1167404/#post-7934452

https://issuetracker.unity3d.com/is...scroll-view-scrolling-when-entering-play-mode

 

thx for the reply. I directly voted for report. Hope there is soon a solution

 

I tried changing vertical-page-size and it did no effect on scrolling speed whatsoever for me too.
I want to match the scrolling speed to ScrollRect's ScrollSensitivity.
And what does it even mean - verticalPageSize? Why not just verticalScrollSensitivity?
Using Unity v2022.1.0f1

 

3 months have passed already, changing

vertical-page-size

still doesn't work.

--unity-metrics-single_line-height

isn't read too (at least in our project). Link to issue tracker doesn't work anymore too.
Now using Unity v2022.1.13f1

 

Seems dead

https://issuetracker.unity3d.com/is...rolling-when-entering-play-mode-and-in-builds

 

Can conform the issues in 2022.2.0b13

 

Waited for this fix for too long. Using reflection as a temporary solution:

Code (CSharp):

1. const float scrollSpeed = 64;
2. var utility = typeof(ScrollView).Assembly.GetType(
3.     $"{nameof(UnityEngine)}.{nameof(UnityEngine.UIElements)}.UIElementsUtility");
4. var lineHeight = utility.GetField("singleLineHeight", BindingFlags.Static | BindingFlags.NonPublic);
5. lineHeight!.SetValue(null, scrollSpeed);

 

I find that to affect the scroll rate you have to set the page size to something 1000+. The side effect of this is that when you press the buttons at the end of the scroll track, the scroll position jumps by a huge amount. Scroll wheel rate should not be connected to how much the end buttons move the dragger.

 

@RunninglVlan, I am having the same issue, any chance you can explain in a few words how to use your fix?

 

Just add it to MonoBehaviour's Awake. The code just changes internal field (through Reflection) that is used in scroll speed logic.

 

For anyone else still running into this problem check out the response here it appears to occur when you enable/disable an EventSystem in the project.

 

According to this issue state, this is fixed. We also didn't notice the issue after upgrading to 2023.2.0a7

 

I reported it again and received an email "Your bug report ScrollView scroll speed decreases when an EventSystem is added to a scene has been confirmed and transferred to the appropriate internal development team at Unity."

 

Had a response from Unity:

Unfortunately, there is not much we can do about this, as we have a dependency there. We recently opened the ScrollView API to give control over the scrolling speed, so that users can adjust it based on their project's specific conditions. The attribute is `mouse-wheel-scroll-size`, or `mouseWheelScrollSize` from code (see https://docs.unity3d.com/ScriptReference/UIElements.ScrollView-mouseWheelScrollSize.html). This was added as an easier way to set the line height, that was previously supported with `--unity-metrics-single_line-height` in uss. Alternatively, if there is no use for the EventSystem with UI Toolkit (when not using UGUI at the same time as UITK), there is a way to manually disable interoperability with: `EventSystem.SetUITookitEventSystemOverride(null, false, false)`

 

Is using the scrollers the only way to scroll in UI Builder scroll view? Why can't I scroll on mouse click like in the older UI scroll view? Is there a way to enable this behavior?

 

BTW, scroll speed is slow again in latest beta and alpha versions =D IIRC, this thread is about it being slow only in UITK, but it's slow in these versions everywhere =)