[Mono-bugs] [Bug 422908] New: [Patch] Don't invalidate ListViewItems during calculation

[bugzilla_noreply at novell.com]

https://bugzilla.novell.com/show_bug.cgi?id=422908


           Summary: [Patch] Don't invalidate ListViewItems during
                    calculation
           Product: Mono: Class Libraries
           Version: SVN
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: Windows.Forms
        AssignedTo: mono-bugs at lists.ximian.com
        ReportedBy: Dax at daxxfiles.net
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---


Created an attachment (id=237352)
 --> (https://bugzilla.novell.com/attachment.cgi?id=237352)
patch to ListView

Currently, Mono invalidates every item in a ListView during calculation of item
sizes and positions. This is, however, pretty slow, lengthening the time
between filling and displaying 1000 items to over five seconds. I went on to
remove the item-by-item invalidation from SetItemLocation and replaced those by
one complete-control invalidation per LayoutDetails() / LayoutIcons().
Rendering is much faster now (no noticeable loss in performace well into the
100.000 items), with no changes in appearance.


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