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TVN_ITEMEXPANDING (Windows Embedded CE 6.0)

  • Статья

1/6/2010

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
Windows Embedded CE Windows CE 1.0 and later

See Also

Reference

Tree View Controls Notifications
NM_TREEVIEW
TV_ITEM
TVM_EXPAND
TVN_ITEMEXPANDED
WM_NOTIFY