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4/8/2010

This message is sent by a header control when a drag operation has begun on one of its items. It is sent only by header controls set to the HDS_DRAGDROP style, and is sent as a WM_NOTIFYmessage.

Syntax 

HDN_BEGINDRAG 
pNMHeader = (LPNMHEADER) 
lParam;

Parameters

pNMHeader

Pointer to an NMHEADERstructure that contains data about the header item dragged.

Return Value

To enable 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.

Remarks

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

Requirements

Header commctrl.h
Windows Embedded CE Windows CE 2.0 and later
Windows Mobile Windows Mobile Version 5.0 and later

See Also