Controls - Double preview notification

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Double preview notification - XTP_GN_PREVIEWCHANGE

Printed From: Codejock Forums
Category: Codejock Products
Forum Name: Controls
Forum Description: Topics Related to Codejock Controls
URL: http://forum.codejock.com/forum_posts.asp?TID=16019
Printed Date: 16 November 2024 at 10:33pm
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Topic: Double preview notification - XTP_GN_PREVIEWCHANGE

Posted By: rdhd
Subject: Double preview notification - XTP_GN_PREVIEWCHANGE
Date 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.