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Q149342: PRB: CListCtrl Inserting Items Slow If in Icon Modes

Article: Q149342
Product(s): Microsoft C Compiler
Version(s): winnt:2.1,2.2,4.0,4.1
Operating System(s): 
Keyword(s): kbcode kbIcon kbListView kbMFC KbUIDesign kbVC210 kbVC220 kbVC400 kbVC410 kbGrpDSMFCATL
Last Modified: 06-MAY-2001

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The information in this article applies to:

- The Microsoft Foundation Classes (MFC), included with:
   - Microsoft Visual C++, 32-bit Editions, versions 2.1, 2.2, 4.0, 4.1 
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SYMPTOMS
========

Inserting a large number of items into a CListCtrl simultaneously may take a
long time if the control is in the LVS_ICON or LVS_SMALLICON modes.

RESOLUTION
==========

Before starting to insert the items, disable painting of the control and
re-enable the painting when the insertions are done. For more information see
the "Sample Code" section of this article.

STATUS
======

This behavior is by design.

MORE INFORMATION
================

A CListCtrl can display its contents in one of four styles: LVS_ICON,
LVS_SMALLICON, LVS_LIST, or LVS_REPORT. The problem does not show up if the
control is in the LVS_LIST or the LVS_REPORT modes.

Sample Code
-----------

  //.....

      m_List.SetRedraw(FALSE); // turn drawing off regardless of list mode

  //....
  //Insert the items
  //....

      m_List.SetRedraw(TRUE); // turn drawing back on and update the window
      m_List.Invalidate();
      m_List.UpdateWindow();

Additional query words: 2.10 2.20 3.10 3.20 4.00 4.10 CListCtrl adding inserting

======================================================================
Keywords          : kbcode kbIcon kbListView kbMFC KbUIDesign kbVC210 kbVC220 kbVC400 kbVC410 kbGrpDSMFCATL 
Technology        : kbAudDeveloper kbMFC
Version           : winnt:2.1,2.2,4.0,4.1
Issue type        : kbprb

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