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Skinned listbox |
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rdmeyers 
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Joined: 11 December 2008 Location: United States Status: Offline Points: 22 |
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 Topic: Skinned listboxPosted: 06 January 2009 at 11:50am |
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I have a listbox that gets populated with 10,000+ items. This typically takes only 1 second, but if the application is skinned it takes 8 seconds! Why should skinning the app effect the performance of seemingly unrelated tasks?
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Oleg
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Joined: 21 May 2003 Location: United States Status: Offline Points: 11234 |
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Posted: 07 January 2009 at 2:58pm |
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Hi,
Guess ListBox redraw Scrollbar on each change.
Just add
m_wndListBox.SetRedraw(FALSE);
m_wndListBox.SetRedraw(TRUE); around populating and you will get same 1sec.
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Oleg, Support Team
CODEJOCK SOFTWARE SOLUTIONS |
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rdmeyers
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Joined: 11 December 2008 Location: United States Status: Offline Points: 22 |
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Posted: 07 January 2009 at 3:49pm |
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I was referring to a standard VB6 listbox control, so your code sample won't work.
Neither hiding the Listbox control, nor calling LockWindowUpdate on it improves the poor performance.
However, I did find a workaround that appears to solve the problem:
SkinFramework1.RemoveWindow Listbox1.hWnd
' fill listbox code goes here SkinFramework1.ApplyWindow Listbox1.hWnd Do you see any potential problem or side effect with this approach?
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TomCollins88
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Joined: 05 February 2009 Location: United States Status: Offline Points: 2 |
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Posted: 08 February 2009 at 9:22am |
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Have you tried turning off the autoredraw for the form?
me.AutoRedraw = False 'load listbox me.AutoRedraw = True Haven't had a chance to try it, but I think it'll work. |
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rdmeyers
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Joined: 11 December 2008 Location: United States Status: Offline Points: 22 |
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Posted: 25 June 2019 at 12:33pm |
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Well it has been 10 years and in an attempt to use the SkinFramework again I have found that this performance problem still exists! How can I prevent the ListBox control from drawing the scrollbar after each item is added to it? I have the control's Visible property set to False, and the Form's AutoRedraw property set to False.
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