TVN_ITEMEXPANDING
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4/8/2010
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 |
| Windows Mobile | Windows Mobile Version 5.0 and later |