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How to determine if a TListBox has a scrollbar 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
27-Aug-02
Category
VCL-General
Language
Delphi 2.x
Views
67
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Publisher:
DSP, Administrator
Reference URL:
DKB
			Author: Tomas Rutkauskas

I'm trying to ensure that a TListBox is wide enough to hold the items in it. 
However, I see no method for determining if a scroll bar exists, and if so how wide 
it is.

Answer:

1   procedure TForm1.FormShow(Sender: TObject);
2   var
3     LBStyle: Longint;
4   begin
5     LBStyle := GetWindowLong(ListBox1.Handle, GWL_STYLE);
6     if (LBStyle and WS_VSCROLL) <> 0 then
7       ShowMessage(' ScrollBar visible, its width is ' + 
8   IntToStr(GetSystemMetrics(SM_CYVSCROLL))
9         + ' pixels ')
10    else
11      ShowMessage('ScrollBar not visible');
12  end;


			
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