public INavigationNode AddNavigationNode(string name, Action showAction, Action closeAction, double group, double order)
{
var navigationNode = new NavigationNode(name, showAction, closeAction, group, order);
// Insert the new navigation node at the right index.
var sameGroup = navigationNodes.Where(x => DoubleEquals(x.Group, group, 1E-9)).ToArray();
if (sameGroup.Any())
{
var nextNode = sameGroup.FirstOrDefault(x => x.Order > order);
int nextNodeIndex = (nextNode != null) ? navigationNodes.IndexOf(nextNode) : navigationNodes.IndexOf(sameGroup.Last()) + 1;
navigationNodes.Insert(nextNodeIndex, navigationNode);
}
else
{
var nextNode = navigationNodes.FirstOrDefault(x => x.Group > group);
if (nextNode != null)
{
int nextNodeIndex = navigationNodes.IndexOf(nextNode);
navigationNodes.Insert(nextNodeIndex, navigationNode);
}
else
{
navigationNodes.Add(navigationNode);
}
}
// Mark the first nodes of a new group. But don't mark the very first node.
double oldGroup = navigationNodes.First().Order;
foreach (var node in navigationNodes.Skip(1))
{
if (!DoubleEquals(oldGroup, node.Group, 1E-9))
{
node.IsFirstItemOfNewGroup = true;
oldGroup = node.Group;
}
else
{
node.IsFirstItemOfNewGroup = false;
}
}
return navigationNode;
}