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TVN_BEGINDRAG

TVN_BEGINDRAG 
    pnmtv = (LPNMTREEVIEW) lParam 

Notifies a tree view control's parent window that a drag-and-drop operation involving the left mouse button is being initiated. This notification message is sent in the form of a WM_NOTIFY message.

• The return value is ignored.

pnmtv

Address of an NMTREEVIEW structure. The itemNew member is a TVITEM structure that contains valid information about the item being dragged in the hItem, state, and lParam members. The ptDrag member specifies the current screen coordinates of the mouse.

A tree view control that has the TVS_DISABLEDRAGDROP style does not send this notification message.

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