In the previous section, we defined an overloaded version of GetNextItem()
which returns the next item in the outline as if the outline were completely
expanded. We now define its counterpart: GetPrevItem(). This function uses
the GetLastItem() defined in an earlier section.
// GetNextItem – Get previous item
as if outline was completely expanded
// Returns
– The item immediately above the reference item
// hItem
– The reference item
HTREEITEM CTreeCtrlX::GetPrevItem( HTREEITEM hItem )
{
HTREEITEM
hti;
hti = GetPrevSiblingItem(hItem);
if( hti == NULL )
hti = GetParentItem(hItem);
else
hti = GetLastItem(hti);
return hti;
}