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HDN_BEGINTRACK notification code

Notifies a header control's parent window that the user has begun dragging a divider in the control (that is, the user has pressed the left mouse button while the mouse cursor is on a divider in the header control). This notification code is sent in the form of a WM_NOTIFY message.


HDN_BEGINTRACK

    pNMHeader = (LPNMHEADER) lParam; 

Parameters

lParam

A pointer to an NMHEADER structure that contains information about the header control and the item whose divider is to be dragged.

Return value

Returns FALSE to allow tracking of the divider, or TRUE to prevent tracking.

Requirements

Minimum supported client

Windows 2000 Professional [desktop apps only]

Minimum supported server

Windows 2000 Server [desktop apps only]

Header

Commctrl.h

Unicode and ANSI names

HDN_BEGINTRACKW (Unicode) and HDN_BEGINTRACKA (ANSI)

 

 

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