TD 6.3.9 - Strange behavior with WheelMouseScroll cDesktopListBox

[pascmeul]

Hi,

we have a strange behavior when scrolling with wheelmouse (to bottom) on cDesktopListBox.
After releasing the wheel, the listbox is scrolling back to the selected listitem.
- cDesktopListBox (vtcomdlg.apl)
- Windows 10 20H2
- TD6.3.9 (virtual environment ThinApp 5.2.9)
See attachment.

We can not simulate this on our systems.
We have no SAM-/VT-message defined to set focus or on scrolling.

This issue is not occuring when scrolling with the navigation bar.
Any ideas?

Pascal

[Dave Rabelink]

I'm not sure it is related but all the Visual Toolchest (VT) listboxes have terrible visual scrolling (when using the wheel).

It is described here and a fix is available:

https://wiki.tdcommunity.net/index.php? ... ual_effect

(you can implement the same fix from the sample on the cDesktopListBox object)

Try this out and see if this solves your problem.

[pascmeul]

Dave,

we will try this and keep you posted

thx

Pascal

[pascmeul]

Dave,

we tested this on serveral computers.
This issues is fixed. Thx!

Although, when expand 1 item, the listbox remains scrolling to the top and back to the selected listitem.
Can we fix this?

Pascal

[Dave Rabelink]

Although, when expand 1 item, the listbox remains scrolling to the top and back to the selected listitem.
Can we fix this?

Do you have a small testcase to show this?