Double preview notification - XTP_GN_PREVIEWCHANGE

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   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.

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rdhd Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 13 August 2007 Location: United States Status: Offline Points: 886	Post Options Post Reply Quote rdhd Report Post Thanks(0) Quote Reply Topic: Double preview notification - XTP_GN_PREVIEWCHANGE 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.