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Scroll is too fast on touch screen

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Stefan
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Stefan asked on 09 Aug 2019, 08:30 AM

Hi!

I'm using WPF RadComboBox in an application and run the application on a Lenovo ThinkPad. It has touch screen and runs Windows 10 Enterprise.

When I have many items in my RadComboBox and scroll through them on the touch screen, the scroll is much too fast - it scrolls too many items at the time.

I installed the WPF Controls Demo and got the same result, though not as apparent since the example doesn't contains as many items.

Have you experienced the same problem? Is there any way I can "slow down" the scroll?

If I use a regular WPF ComboBox instead of the RadComboBox, I don't have this problem. But I'd really prefer to use the RadComboBox if possible =)

Best Regards!

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Stefan
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answered on 09 Aug 2019, 08:43 AM
And for additional information; the version of Telerik UI for UI I'm using is 2019.1.220.
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Dinko
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answered on 14 Aug 2019, 08:29 AM
Hi Stefan,

The scrolling inertia depends on the swipe length. The touch mechanism does not provide a way to reduce the speed of the scrolling. What comes up to my mind is to set the ScrollViewer.CanContentScroll property to false of the RadComboBox. This way the scrolling will be by pixel and not by item. I need to point here that this approach will disable the virtualization of the items inside the dropdown. In a scenario with large numbers of items, this approach will reduce the loading performance of the items.

Give this approach a try and let me know if it works for you.

Regards,
Dinko
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Stefan
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answered on 15 Aug 2019, 07:32 AM

Hi Dinko,

This solution worked perfectly - thank you so much for your help!

Best Regards

Stefan

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Stefan
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answered on 15 Aug 2019, 07:47 AM

And so far I haven't seen any issues with performance =)

/Stefan

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