Mouse scroll no working

[Asmix]

I have an issue with 8.51a.
Mouse scroll not working in branch view with full details of 170000 files.
OS: Win XP SP3 32-bit

[Dalai]

Is smooth scrolling in listboxes enabled on your system (which causes severe slowdowns of listbox scrolling)? This is a system setting in control panel, see TC FAQ on how to disable it.

Regards
Dalai

[ghisler(Author)]

This is a known bug of some mouse drivers: They use old scrollbar functions which are limited to 65535 lines.

[Asmix]

2Dalai
Smooth scroll is disabled.

2ghisler(Author)
In other programs with lines count >65536 scroll is working pretty good.
In TC with Brief view scroll is working too.

PS. I test this case and found that problem with Delphi TListBox, which is ancestor to your TMyListBox component.

[ghisler(Author)]

Delphi TListBox uses just a normal Windows Listbox control.

[MarcinW]

Many listbox LB_XXX messages are limited to 16 bits under Win9x (for example LB_SETTOPINDEX). It's really possible, that Delphi 2 uses a Word variable somewhere improperly, so TListBox component doesn't work properly under WinNT.

[ghisler(Author)]

OK, I will check that.