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Hiding the scrollbar makes touchscreens no longer able to scroll output?

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Posted by Fiendish   USA  (2,525 posts)  [Biography] bio   Global Moderator
Date Sun 23 Aug 2020 09:56 PM (UTC)
Message
I don't know what's going on exactly, but I have reports from a few people with touchscreens now that if the main scrollbar is visible, dragging on their touchscreen scrolls the output. But if they hide the scrollbar with SetScroll(-2, false) then their touchscreens are no longer able to scroll the display and dragging highlights text instead.

https://github.com/fiendish/aardwolfclientpackage
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Posted by Nick Gammon   Australia  (23,016 posts)  [Biography] bio   Forum Administrator
Date Reply #1 on Mon 24 Aug 2020 12:42 AM (UTC)
Message
This is probably an OS issue - if there is no scrollbar then the dragging of the finger has nowhere to direct the movement to.

- Nick Gammon

www.gammon.com.au, www.mushclient.com
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Posted by Fiendish   USA  (2,525 posts)  [Biography] bio   Global Moderator
Date Reply #2 on Mon 24 Aug 2020 04:11 PM (UTC)

Amended on Mon 24 Aug 2020 04:13 PM (UTC) by Fiendish

Message
Ah, allowing touchscreen scrolling at all seems like a legacy fallback behavior. By default Windows 7+ converts WM_GESTURE into WM_*SCROLL but only if a scrollbar is present. It seems like it may be possible to restore touchscreen scrolling even without a scrollbar by registering for WM_GESTURE as well if it's available?

https://docs.microsoft.com/en-us/windows/win32/wintouch/legacy-support-for-panning-with-scrollbars

https://docs.microsoft.com/en-us/windows/win32/wintouch/improving-the-single-finger-panning-experience

https://docs.microsoft.com/en-us/windows/win32/wintouch/windows-touch-gestures-overview#legacy-support

https://github.com/fiendish/aardwolfclientpackage
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