The TVN_SELCHANGING notification message notifies a tree-view control's parent window that the selection is about to change from one item to another. This notification message is sent in the form of a WM_NOTIFY message.
TVN_SELCHANGING
pnmtv = (NM_TREEVIEW FAR *) lParam
Parameters
pnmtv
Pointer to an NM_TREEVIEW structure. The itemOld and itemNew members contain valid information about the currently selected item and the newly selected item. The action member indicates whether a mouse or keyboard action is causing the selection to change. For a list of possible values, see the description of the TVN_SELCHANGED notification message.
Return Values
Returns TRUE to prevent the selection from changing.
See Also