Re: [DUG] Screen flicker on updating control properties

[Mark Howard]

Thanks for the replies, but it seems that the problem lies elsewhere:  It  
is not actually the Radio group control that is flickering, its a  
Tnotebook that it holds some speed buttons.  It must be being referenced  
somehow while the RadioGroup properties are being updated.

I'll have to do some tracking.
Thanks
Mark
On Tue, 14 Sep 2004 12:02:13 +1200, Robert martin <[EMAIL PROTECTED]>  
wrote:

Try this.  It disables any windows control.
procedure LockControl(Control: TWinControl; Lock: Boolean);
//RM Dangerous, enables /disables a visual components displaying ability
begin
    if (Control <> nil)
            and (Control.Handle <> 0) then begin
        if (Lock  = True) then begin
            SendMessage(Control.Handle, WM_SETREDRAW, 0, 0);
        end
        else begin
            SendMessage(Control.Handle, WM_SETREDRAW, 1, 0);
            RedrawWindow(Control.Handle,
                            nil,
                            0,
                            RDW_ERASE or RDW_FRAME or RDW_INVALIDATE or
RDW_ALLCHILDREN);
        end;
   end;
end;

Rob Martin
Software Engineer
phone 03 377 0495
fax 03 377 0496
web www.chreos.com
Wild Software Ltd
----- Original Message -----
From: <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Tuesday, September 14, 2004 11:45 AM
Subject: RE: [DUG] Screen flicker on updating control properties

The only thing I can see in Delphi 5 is TWinControl.DisableAlign &
.EnableAlign.
I thought there might have been something like the BeginUpdate and
EndUpdate methods on TTreeNode, but not that I can see. :-(
Good luck,
C.
-----Original Message-----
From: Mark Howard [mailto:[EMAIL PROTECTED]
I am changing the number and text of items in a RadioGroup on a form and
re-setting the RadioGroup's size, at run time.
This is causing the screen to flicker.
Can the flicker be stopped?
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