tvn-selchanging.md

title	description	ms.assetid	keywords	topic_type	api_name	api_location	api_type	ms.topic	ms.date
TVN_SELCHANGING notification code (Commctrl.h)	Notifies a tree-view control's parent window that the selection is about to change from one item to another. This notification code is sent in the form of a WM\_NOTIFY message.	53f24ee0-433c-4680-9075-5e2b21117ed9	TVN_SELCHANGING notification code Windows Controls	apiref	TVN_SELCHANGING TVN_SELCHANGINGA TVN_SELCHANGINGW	Commctrl.h	HeaderDef	reference	05/31/2018

TVN_SELCHANGING notification code

Notifies a tree-view control's parent window that the selection is about to change from one item to another. This notification code is sent in the form of a WM_NOTIFY message.

TVN_SELCHANGING 

    pnmtv = (LPNMTREEVIEW) lParam 

Parameters

lParam

Pointer to an NMTREEVIEW structure. The itemOld and itemNew members contain valid information about the currently selected item and the newly selected item. The action member indicates whether a mouse or keyboard action is causing the selection to change. For a list of possible values, see the description of the TVN_SELCHANGED notification code.

Return value

Returns TRUE to prevent the selection from changing.

Remarks

When responding to this notification code, applications should not delete the items that are gaining or losing the selection.

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_SELCHANGINGW (Unicode) and TVN_SELCHANGINGA (ANSI)