TVN_ITEMEXPANDING (Windows CE 5.0)
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.
TVN_ITEMEXPANDINGpnmtv= (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 Values
TRUE prevents the list from expanding or collapsing.
Requirements
OS Versions: Windows CE 1.0 and later.
Header: Commctrl.h.
See Also
NM_TREEVIEW | TV_ITEM | TVM_EXPAND | TVN_ITEMEXPANDED | WM_NOTIFY
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