Handling EM_SCROLL

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2 total messages Started by Paul Edwards Thu, 08 May 2003 23:13

#16606

Author: Paul Edwards
Date: Thu, 08 May 2003 23:13

18 lines
1707 bytes

Appologies for cross posting but on reflecion this probably should have gone
here rather than vclcomponents

I have an application where I ned to handle the EM_SCROLL message in a Rich
edit - I have SubClassed the WindowProc for the TRichEdit and used hte
follwoing routine.

void __fastcall TForm1::MyAsciiProc(TMessage &Message)
{
  OldAsciiProc(Message);
  if( (Message.Msg == EM_SCROLL)
    Posn->Perform(Message.Msg, Message.WParam, Message.LParam);
}

Placing a break point inside this routine shows either that the EM_SCROLL
message is not generated or that it isnot getting to this routine - any one
got any ideas. I have searched through the MER archive and the only
references to subclssing that I see are for WM messages not EM messages.

Re: Handling EM_SCROLL

#16607

Author: Remy Lebeau (TeamB)
Date: Fri, 09 May 2003 06:36

16 lines
1706 bytes

"Paul Edwards" <noone@nowhere.net> wrote in message
news:3ebae48a$1@newsgroups.borland.com...

> I have an application where I ned to handle the
> EM_SCROLL message in a Rich edit

Handle the CN_NOTIFY message instead.  It is a copy of the WM_NOTIFY message
that is sent to the RichEdit's parent window.  Test the NMHDR's code member
for the EN_HSCROLL and EN_VSCROLL notifications instead.  You'll have to
first send the RichEdit an EM_SETEVENTMASK message with the EN_SCROLL mask
to enable the notifications.  Also have a look at the ENM_KEYEVENTS mask as
well to enable the EN_MSGFILTER notification.


Gambit

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