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TVN_BEGINDRAG notification code

  • Artikkel

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

TVN_BEGINDRAG 

    pnmtv = (LPNMTREEVIEW) lParam

Parameters

lParam

Pointer to 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.

Return value

The return value is ignored.

Remarks

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

Requirements

Requirement Value
Minimum supported client
 Windows Vista [desktop apps only]
Minimum supported server
 Windows Server 2003 [desktop apps only]
Header
Commctrl.h
Unicode and ANSI names
 TVN_BEGINDRAGW (Unicode) and TVN_BEGINDRAGA (ANSI)