TScrollbox and MouseWheel

Shineway Zhu

Delphi Developer

Wed, 06 Apr 2005 21:50:31 GMT

TScrollbox and MouseWheel

Hi,

I have a TScrollbox in a D7 application.
It does not respond to wheel mouse scrolling.
Should I write some codes for the event OnMouseWheel? If so, how?

If it makes any difference: I'm on WinXP Pro, logitech wheel mouse.

Maynard Philbroo

Delphi Developer

Thu, 07 Apr 2005 00:43:28 GMT

Re:TScrollbox and MouseWheel

List, and combo boxes i think are the ones that inheritly respond to
that message.
the message being WM_MOUSEWHEEL message.

Quote

Shineway Zhu wrote:
> Hi,

> I have a TScrollbox in a D7 application.
> It does not respond to wheel mouse scrolling.
> Should I write some codes for the event OnMouseWheel? If so, how?

> If it makes any difference: I'm on WinXP Pro, logitech wheel mouse.

Chris Luc

Delphi Developer

Thu, 07 Apr 2005 03:13:05 GMT

Re:TScrollbox and MouseWheel

Quote

"Shineway Zhu" <shine...@msn.com> wrote in message

news:3db16350@newsgroups.borland.com...

Quote

> I have a TScrollbox in a D7 application.
> It does not respond to wheel mouse scrolling.
> Should I write some codes for the event OnMouseWheel? If so, how?

> If it makes any difference: I'm on WinXP Pro, logitech wheel mouse.
> logitech wheel mouse

It makes a difference, Logitech drivers use a mouse hook. The mouse-settings
in Control Panel (Buttons tab) include an option to use (or not) MS-Office
compatible scroll behaviour. If you have that setting disabled then, if the
mouse is over a scrollable entity, it sends only Scroll messages. No wheel
messages whatever! The converse is true when set to Office compatible scroll.

It sounds like you have yours set to Office-compatible. The non-Office
setting is the most generally useful one as the scroll messages can be sent to
controls (windows) that have no wheel awareness so the wheel works everywhere.
If you write code for the wheel it should allow a Logitech to work in either
setting. The MS Intellipoint driver does something similar but it tries to
adjust itself automatically to the capabilities of the the control. Sometimes
it screws-up and sends both wheel and scroll messages.

--
Regards,
Chris Luck.

Shineway Zh

Delphi Developer

Thu, 07 Apr 2005 10:16:31 GMT

Re:TScrollbox and MouseWheel

Hi Chris,

I do use Logitech mouse, but I do not use the driver from Logitech!

WinXP automatically installed the driver for me, and from the mouse driver
file detail I can see the provider is Microsoft while file version
5.1.2600.0(XPClient.010817-1148), so there is nowhere can I find the option
to use (or not) MS-Office compatible scroll behaviour!

Any idea?

Quote

"Chris Luck" <ch...@bvhg.freeXXserve.co.uk> wrote in message

news:3db1af14@newsgroups.borland.com...

Quote

> "Shineway Zhu" <shine...@msn.com> wrote in message
> news:3db16350@newsgroups.borland.com...

> > I have a TScrollbox in a D7 application.
> > It does not respond to wheel mouse scrolling.
> > Should I write some codes for the event OnMouseWheel? If so, how?

> > If it makes any difference: I'm on WinXP Pro, logitech wheel mouse.

> > logitech wheel mouse

> It makes a difference, Logitech drivers use a mouse hook. The
mouse-settings
> in Control Panel (Buttons tab) include an option to use (or not) MS-Office
> compatible scroll behaviour. If you have that setting disabled then, if
the
> mouse is over a scrollable entity, it sends only Scroll messages. No
wheel
> messages whatever! The converse is true when set to Office compatible
scroll.

> It sounds like you have yours set to Office-compatible. The non-Office
> setting is the most generally useful one as the scroll messages can be
sent to
> controls (windows) that have no wheel awareness so the wheel works
everywhere.
> If you write code for the wheel it should allow a Logitech to work in
either
> setting. The MS Intellipoint driver does something similar but it tries
to
> adjust itself automatically to the capabilities of the the control.
Sometimes
> it screws-up and sends both wheel and scroll messages.

> --
> Regards,
> Chris Luck.

Michael Warne

Delphi Developer

Fri, 08 Apr 2005 01:37:20 GMT

Re:TScrollbox and MouseWheel

Quote

On Sat, 19 Oct 2002 21:50:31 +0800, "Shineway Zhu" <shine...@msn.com> wrote:
>If it makes any difference: I'm on WinXP Pro, logitech wheel mouse.

Just as an aside, it might be helpful for you to use WinSight to see
wether WM_MOUSEWHEEL or WM_VSCROLL messages are
being sent to the control. I have a Logitech mouse, but don't use
the "emulation" setting which generates the latter anymore.

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