/// <summary>
/// Returns true if item with given descriptor is active
/// </summary>
private static bool IsActive(UrlHelper url, Descriptor descriptor)
{
var controller = url.RequestContext.RouteData.GetRequiredString("controller");
var action = url.RequestContext.RouteData.GetRequiredString("action");
var children = GetChildren(descriptor).ToList();
return url.RequestContext.RouteData.Route == url.RouteCollection[descriptor.Route]
&& children.Any(child => string.Equals(child.Item1, controller, StringComparison.OrdinalIgnoreCase)
&& string.Equals(child.Item2, action, StringComparison.OrdinalIgnoreCase));
}
/// <summary>
/// Returns collection of children and subchildren for specific descriptor
/// </summary>
private static IEnumerable<Tuple<string, string>> GetChildren(Descriptor descriptor)
{
if (descriptor == null) yield break;
yield return new Tuple<string, string>(descriptor.Controller, descriptor.Action);
if (descriptor.Children != null)
{
//here we do not need to check for Hidden because even for hidden children their parent should be highlighted
foreach (var action in descriptor.Children.SelectMany(GetChildren)) yield return action;
}
}
/// <summary>
/// Converts descriptor to menu node
/// </summary>
private static Node ToMenuItem(Descriptor descriptor, UrlHelper url, HtmlHelper html)
{
if (descriptor == null) return null;
if (descriptor.Hidden) return null;
return new Node
{
Options = descriptor.Options,
Url = url.RouteUrl(descriptor.Route, new { descriptor.Controller, descriptor.Action }),
IsActive = IsActive(url, descriptor),
Children = descriptor.Children != null
? descriptor.Children.Safe().Select(x => ToMenuItem(x, url, html)).Where(x => x != null)
: Enumerable.Empty<Node>()
};
}
/// <summary>
/// Builds menu from provided menu description
/// </summary>
public static IEnumerable<Node> Menu(this HtmlHelper html, Descriptor[] items)
{
var url = new UrlHelper(html.ViewContext.RequestContext, html.RouteCollection);
return items.Select(x => ToMenuItem(x, url, html)).Where(x => x != null);
}