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Author Topic: [CLOSED] Scrollbox detect vertical scroll  (Read 1315 times)

pcurtis

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[CLOSED] Scrollbox detect vertical scroll
« on: January 28, 2022, 11:18:48 pm »
How can I detect when a scrollbox is vertically scrolled and when it can't scroll anymore?

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« Last Edit: January 29, 2022, 12:23:05 pm by pcurtis »
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Windows 10 20H2
Laz 2.2.0
FPC 3.2.2

jamie

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Re: Scrollbox detect vertical scroll
« Reply #1 on: January 29, 2022, 12:43:32 am »

https://docs.microsoft.com/en-us/windows/win32/controls/wm-vscroll


That may help you. With laz you use the LMessages and LM_VSCROLL I think..

otherwise you can use the windows unit and WM_VSCROLL to override the message
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jamie

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Re: Scrollbox detect vertical scroll
« Reply #2 on: January 29, 2022, 12:48:50 am »
Quote from: pcurtis on January 28, 2022, 11:18:48 pm
How can I detect when a scrollbox is vertically scrolled and when it can't scroll anymore?

Hmm, maybe you are talking about the  Position of the scrollbar and size of the client height.?

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