TVN_ITEMEXPANDING notification code

Notifies a tree-view control's parent window that a parent item's list of child items is about to expand or collapse. This notification code is sent in the form of a WM_NOTIFY message.


TVN_ITEMEXPANDING 

    pnmtv = (LPNMTREEVIEW) lParam 

Parameters

lParam

Pointer to an NMTREEVIEW structure. The itemNew member is a TVITEM structure that contains valid information about the parent item in the hItem, state, and lParam members. The action member indicates whether the list is to expand or collapse. For a list of possible values, see the description of the TVM_EXPAND message.

Return value

Returns TRUE to prevent the list from expanding or collapsing.

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

TVN_ITEMEXPANDINGW (Unicode) and TVN_ITEMEXPANDINGA (ANSI)

See also

TVN_ITEMEXPANDED

 

 

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