[mcarro]

Hi, I have a TsScrollBox with many controls inside. When I move the scrollbox contents dragging the scrollbar thumbs everything (re)paints beautifully, but if I set the value of VertScrollbar.Position programmatically the controls move to the new position but the background does not seem to scroll (or in any case fails to repaint properly).

I tried calling Invalidate and Repaint on the scrollbox after setting the Position property, but does not make any difference.

Is there anything else I should be doing? I'm using v6.54.

Thanks in advance for any hint…
Mario

[Support]

Hello
Can you show a demo with the problem?
Thank you in advance.

[mcarro]

Hi, excuse me for the delay. I'm attaching an (ugly) small test app showing the problem.

Scroll the using the mousewheel. Look at the bottom part of frame #1 when scrolling upwards and the upper part of frame #2 when scrolling down. You'll see that the background color in the frames is wrong. If you then drag a bit the scrollbar by its thumb everything repaints as it should.

Thanks…
Mario

[Support]

Hi
Thank you for the demo, I understand a problem now. This issue can't be fixed quickly, some changes in the engine are needed. I think this problem will be solved but not in nearest releases.

[mcarro]

Ok, thanks for your answer. Any workaround meanwhile? Is there a way I can force the skin to repaint the background?

[Support]

Try this line after ScrollBar position changing :
RedrawWindow(sScrollBox1.Handle, nil, 0, RDW_ALLCHILDREN or RDW_INVALIDATE);

[mcarro]

Is not as smooth scrolling dragging the thumb of the scrollbar, but it will do the trick until is fixed in the engine.
Thanks!

[Author]

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