Skin Framework - Skinned listbox

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Skinned listbox

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Category: Codejock Products
Forum Name: Skin Framework
Forum Description: Topics Related to Codejock Skin Framework
URL: http://forum.codejock.com/forum_posts.asp?TID=13085
Printed Date: 23 November 2024 at 4:50am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com

Topic: Skinned listbox

Posted By: rdmeyers
Subject: Skinned listbox
Date Posted: 06 January 2009 at 11:50am

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?

Replies:

Posted By: Oleg
Date Posted: 07 January 2009 at 2:58pm

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.

-------------
Oleg, Support Team
CODEJOCK SOFTWARE SOLUTIONS

Posted By: rdmeyers
Date Posted: 07 January 2009 at 3:49pm

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?

Posted By: TomCollins88
Date Posted: 08 February 2009 at 9:22am

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.

Posted By: rdmeyers
Date Posted: 25 June 2019 at 12:33pm

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.