🚀 go-pugleaf

Thanks a lot...works a treat..

"Remy Lebeau (TeamB)" <gambit47.no.spam@no.spam.yahoo.com> wrote in message
news:40d3fcbd$1@newsgroups.borland.com...
>
> "borland" <rogersmail@ntlworld.com> wrote in message
> news:40d3e14f@newsgroups.borland.com...
>
> > the only difference between the two programs is the listview
> > that works fine is placed upon a form directly, whereas this
> > one that i am having trouble with is place upon a TabSheet
> > which in turn is on a PageControl.
>
> That makes a *big* difference.  You are trying to catch the message in the
> wrong place.  The Parent of the ListView is the one that always receives
the
> message.  In this case, the TabSheet, not the form, will be the one to
> receive the message.  Since you are trying to catch it from the form
itself,
> you will never see the message when the ListView is on the TabSheet.
>
> With that said, you should subclass the ListView's WindowProc property
> directly and then look for CN_NOTIFY messages instead of WM_NOTIFY.  The
VCL
> is specifically set up to forward WM_NOTIFY and WM_COMMAND messages to
> individual components so that they can handle their own messages directly
> regardless of which Parent components received the original messages.
>
> In other words, do the following instead:
>
>     TWndMethod OldListViewProc = NULL;
>
>     __fastcall TMainForm::TMainForm(TComponent *Owner)
>         : TForm(Owner)
>     {
>         OldListViewProc = ListView1->WindowProc;
>         ListView1->WindowProc = ListViewWndProc;
>     }
>
>     void __fastcall TMainForm::ListViewWndProc(TMessage &Message)
>     {
>         if( Message.Msg == CN_NOTIFY )
>         {
>             LPNM_LISTVIEW lpnm = (NM_LISTVIEW *)Message.LParam;
>             if( lpnm->hdr.code == NM_CUSTOMDRAW )
>             {
>                 // at this point, you already know the message belongs
>                 // to the ListView so just always handle it here as
> needed...
>                 return;
>             }
>         }
>
>         // default handling...
>         OldListViewProc(Message);
>     }
>
>
> Gambit
>
>