This notification 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.
At a Glance
| Header file: | Commctrl.h |
| Windows CE versions: | 1.0 and later |
Syntax
Parameters
pnmtv
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 Values
TRUE prevents the list from expanding or collapsing.
See Also
NM_TREEVIEW, TV_ITEM, TVM_EXPAND, TVN_ITEMEXPANDED, WM_NOTIFY