MonoGame.Samples/NetworkStateManagement/Core/Networking/AvailableSessionMenuEntry.cs

//-----------------------------------------------------------------------------
// AvailableSessionMenuEntry.cs
//
// Microsoft XNA Community Game Platform
// Copyright (C) Microsoft Corporation. All rights reserved.
//-----------------------------------------------------------------------------

using System;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Net;


namespace NetworkStateManagement
{
	/// <summary>
	/// Helper class customizes the standard MenuEntry class
	/// for displaying AvailableNetworkSession objects.
	/// </summary>
	class AvailableSessionMenuEntry : MenuEntry
	{

		AvailableNetworkSession availableSession;
		bool gotQualityOfService;




		/// <summary>
		/// Gets the available network session corresponding to this menu entry.
		/// </summary>
		public AvailableNetworkSession AvailableSession
		{
			get { return availableSession; }
		}





		/// <summary>
		/// Constructs a menu entry describing an available network session.
		/// </summary>
		public AvailableSessionMenuEntry(AvailableNetworkSession availableSession)
		: base(GetMenuItemText(availableSession))
		{
			this.availableSession = availableSession;
		}


		/// <summary>
		/// Formats session information to create the menu text string.
		/// </summary>
		static string GetMenuItemText(AvailableNetworkSession session)
		{
			int totalSlots = session.CurrentGamerCount +
				session.OpenPublicGamerSlots;

			return string.Format("{0} ({1}/{2})", session.HostGamertag,
						session.CurrentGamerCount,
						totalSlots);
		}





		/// <summary>
		/// Updates the menu item text, adding information about the network
		/// quality of service as soon as that becomes available.
		/// </summary>
		public override void Update(MenuScreen screen, bool isSelected,
							GameTime gameTime)
		{
			base.Update(screen, isSelected, gameTime);

			// Quality of service data can take some time to query, so it will not
			// be filled in straight away when NetworkSession.Find returns. We want
			// to display the list of available sessions straight away, and then
			// fill in the quality of service data whenever that becomes available,
			// so we keep checking until this data shows up.
			if (screen.IsActive && !gotQualityOfService)
			{
				QualityOfService qualityOfService = availableSession.QualityOfService;

				if (qualityOfService.IsAvailable)
				{
					// TODO: Check if the compatibility layer supports AverageRoundtripTime
					// For now, show a default ping time
					TimeSpan pingTime = TimeSpan.FromMilliseconds(50); // Default 50ms ping
																	   // TimeSpan pingTime = qualityOfService.AverageRoundtripTime;

					Text += string.Format(" - {0:0} ms", pingTime.TotalMilliseconds);

					gotQualityOfService = true;
				}
			}
		}


	}
}