public CommandTreeNode <T> Previous(CommandTreeNode <T> selection)
{
var pLoc = FindParentLocation(selection, Subs);
var arr = pLoc?.Item1.Subs.ToArray();
return(arr?[pLoc.Item2 - 1 < 0 ? arr.Length - 1: pLoc.Item2 - 1]);
}
public CommandTreeNode <T> Next(CommandTreeNode <T> selection)
{
var pLoc = FindParentLocation(selection, Subs);
var arr = pLoc?.Item1.Subs.ToArray();
return(arr?[pLoc.Item2 + 1 >= arr.Length ? 0: pLoc.Item2 + 1]);
}
private CommandTreeNode(CommandTreeNode <T> parent, T key, string value, IEnumerable <CommandTreeNode <T> > subs)
{
_parent = parent;
Key = key;
Value = value;
Subs = subs?.Select(x => new CommandTreeNode <T>(this, x.Key, x.Value, x.Subs)).ToList() ?? new List <CommandTreeNode <T> >();
}
private Tuple <CommandTreeNode <T>, int> FindParentLocation(CommandTreeNode <T> selection, List <CommandTreeNode <T> > nodes)
{
var ns = nodes.ToArray();
for (var i = 0; i < ns.Length; i++)
{
if (ReferenceEquals(ns[i], selection))
{
return(new Tuple <CommandTreeNode <T>, int>(ns[i]._parent, i));
}
var p = FindParentLocation(selection, ns[i].Subs);
if (p != null)
{
return(p);
}
}
return(null);
}