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TVN_ITEMEXPANDING (Compact 2013)

  • 项目

3/28/2014

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

Syntax

TVN_ITEMEXPANDING pnmtv = (NM_TREEVIEW FAR *) lParam

Parameters

  • pnmtv
    Pointer to an NM_TREEVIEW 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

TRUE prevents the list from expanding or collapsing.

Requirements

Header

commctrl.h

See Also

Reference

Tree View Controls Notifications
NM_TREEVIEW
TV_ITEM
TVM_EXPAND
TVN_ITEMEXPANDED
WM_NOTIFY