Questions about CTreeView

[tabaar]

Q1: How to switch on/off lines at root, buttons, etc. when tree view already constructed? SetWindowLong or something else, how to call it?

Q2: How to determine in OnItemexpanded() whether item was _expanded_ _or_ _collapsed_?

Great Thanx!

 

[Guest_imported]

1.
long lStyle = GetWindowLong( hwndTreeCtrl, GWL_STYLE );
lStyle |= (TVS_HASBUTTONS|TVS_HASLINES|TVS_LINESATROOT) ;
SetWindowLong( hwndTreeCtrl, GWL_STYLE, lStyle );

2.

void CMyTreeView::OnItemexpanded(NMHDR* pNMHDR, LRESULT* pResult)
{
NM_TREEVIEW* pnmtv = (NM_TREEVIEW*)pNMHDR;
TV_ITEM item = pnmtv->itemNew;
*pResult = 0;

switch ( pnmtv->action ) {
case TVE_COLLAPSE:
...
case TVE_EXPAND:
...
}
}