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HDN_BEGINDRAG

HDN_BEGINDRAG
   pNMHeader = (LPNMHEADER) lParam;

Sent by a header control when a drag operation has begun on one of its items. This notification message is sent only by header controls that are set to the HDS_DRAGDROP style. This notification is sent in the form of a WM_NOTIFY message.

• To allow the header control to automatically manage drag-and-drop operations, return FALSE. If the owner of the control is manually performing drag-and-drop reordering, return TRUE.

pNMHeader

Address of an NMHEADER structure containing information about the header item that is being dragged.

A header control defaults to automatically managing drag-and-drop reordering. Returning TRUE to indicate external (manual) drag-and-drop management allows the owner of the control to provide custom services as part of the drag-and-drop process.

Version 4.70

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