Scrolling, just scrolling

Roy Sheridan

Delphi Developer

Mon, 26 Nov 2001 03:00:00 GMT

Scrolling, just scrolling

I need to coordinate other things with items in a TListBox. How can I
tell when the user has manually scrolled it up or down; what event is
raised??

Alexandru Pred

Delphi Developer

Mon, 26 Nov 2001 03:00:00 GMT

Re:Scrolling, just scrolling

You can't unless you derive a new component from TListBox and intercept the
WM_VSCROLL message. If you need help on doing this, mail me and i'll give
you an example.

Alex.

Quote

Roy Sheridan wrote in message <375FD177.A44FE...@orchestration.com>...

|I need to coordinate other things with items in a TListBox. How can I
|tell when the user has manually scrolled it up or down; what event is
|raised??
|

Andreas Pawli

Delphi Developer

Tue, 27 Nov 2001 03:00:00 GMT

Re:Scrolling, just scrolling

Quote

>Roy Sheridan wrote:

>I need to coordinate other things with items in a TListBox. How can I
>tell when the user has manually scrolled it up or down; what event is
>raised??

To "coordinate other things" you might want to retrieve a string after
scrolling, so maybe you can use this:

var
n, y : integer;
s : string;

y := GetScrollPos( ListBox.Handle, SB_VERT ) + n;
//gets the topmost + n of the *visible* listbox items
s := ListBox.Items[y];
_________
Andreas

Roy Sherida

Delphi Developer

Tue, 27 Nov 2001 03:00:00 GMT

Re:Scrolling, just scrolling

Thank you - a simple example would be appreciated!! Thanks.

Quote

Alexandru Preda wrote:
> You can't unless you derive a new component from TListBox and intercept the
> WM_VSCROLL message. If you need help on doing this, mail me and i'll give
> you an example.

> Alex.

> Roy Sheridan wrote in message <375FD177.A44FE...@orchestration.com>...
> |I need to coordinate other things with items in a TListBox. How can I
> |tell when the user has manually scrolled it up or down; what event is
> |raised??
> |

Other Threads

1. How to let my label scroll with the richedit's scroll bar

2. TPageControl: Using the scroll buttons to change groups intead of just scrolling