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How to give a listbox a rounded border Turn on/off line numbers in source code. Switch to Orginial background IDE or DSP color Comment or reply to this aritlce/tip for discussion. Bookmark this article to my favorite article(s). Print this article
09-Jan-04
Category
VCL-General
Language
Delphi 2.x
Views
127
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Publisher:
DSP, Administrator
Reference URL:
DKB
			Author: Jonas Bilinkevicius

How to give a listbox a rounded border

Answer:

To round a ListBox use CreateRoundRectRgn to shape it. Reduce the client size to 
reposition back in place. Experiment with the rounding value. The greater the round 
value the smoother it is.

Add a TListBox to a form

1   procedure TForm1.RoundListbox(var TheList: TListbox);
2   const
3     schange = 5;
4     rnd = 20;
5   var
6     thergn: HRGN;
7     mclient: TRect;
8   begin
9     mclient := TheList.ClientRect; {get size}
10    thergn := CreateRoundRectRgn(mclient.Left, mclient.top, mclient.right,
11      mclient.bottom, rnd, rnd);
12    TheList.BorderStyle := bsNone;
13    InflateRect(mclient, -schange, -schange); {shrink}
14    TheList.Perform(EM_SETRECTNP, 0, lparam(@mclient)); {change}
15    SetWindowRgn(TheList.Handle, thergn, true);
16  end;


			
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