Codejock Developer Community : Double preview notification - XTP_GN_PREVIEWCHANGE http://forum.codejock.com/ Copyright (c) 2006-2013 Web Wiz Forums - All Rights Reserved. Wed, 13 May 2026 02:47:06 +0000 Fri, 15 Jan 2010 16:56:38 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.04 360 forum.codejock.com/RSS_post_feed.asp?TID=16019 <![CDATA[Codejock Developer Community]]> http://forum.codejock.com/forum_images/codejock-logo.gif http://forum.codejock.com/ <![CDATA[Double preview notification - XTP_GN_PREVIEWCHANGE : I have noticed that a gallery...]]> http://forum.codejock.com/forum_posts.asp?TID=16019&PID=56174&title=double-preview-notification-xtp-gn-previewchange#56174 Author: rdhd
Subject: 16019
Posted: 15 January 2010 at 4:56pm

I have noticed that a gallery seems to get the XTP_GN_PREVIEWCHANGE twice in some circumstances.
 
The first notification comes from OnMouseHover and is expected. The second notification comes from CXTPControlGallery::HideSelection.
 
To see this, I set a breakpoint in my notification handler and popup my gallery. Then I move the mouse over an item in the gallery and the OnMouseHover code sends me the notificatoin. Then if I hit the escape key, HideSelection calls me again.
 
We have some pretty expensive display operations that are executing and I wonder why the call is being made from both places. And I wonder how to avoid the duplicate call.
]]> Fri, 15 Jan 2010 16:56:38 +0000 http://forum.codejock.com/forum_posts.asp?TID=16019&PID=56174&title=double-preview-notification-xtp-gn-previewchange#56174