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} internal void ShowLoginView() { viewParticipants.Visibility = Visibility.Collapsed; viewLogin.Visibility = Visibility.Visible; viewChat.Visibility = Visibility.Collapsed; } } } The MainPage constructor creates a new instance of the ClientConnectionManager named ConnManager, initializing its ParentPage property with this Page instance. This is done so that in the ClientConnectionManager implementation, you have access to MainPage and its UI elements to effect various state changes. You also set the DataContext of the topmost Grid named LayoutRoot to ConnManager so that all the bindings to various properties of ClientConnectionManager that you saw in the XAML can be put into effect. The various Button click handlers are self-explanatory; corresponding functions in the ClientConnectionManager are invoked from them. The ShowLoginView(), ShowParticipantsView(), and ShowChatView() methods toggle between views and are used from within the ClientConnectionManager, as you see next. We have encapsulated all the client-side sockets based communication and message processing in ClientConnectionManager. Listing 7-24 shows the ClientConnectionManager class. Listing 7-24. ClientConnectionManager in ConnectionManager.cs using using using using using using using System; System.Collections.Generic; System.Collections.ObjectModel; System.ComponentModel; System.IO; System.Net; System.Net.Sockets;

namespace Recipe7_5.ChatClient { public class ClientConnectionManager : INotifyPropertyChanged { public event PropertyChangedEventHandler PropertyChanged; //create a new socket Socket ClientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); //reference to the parent page public Page ParentPage { get; set; } //participants collection private ObservableCollection<string> _Participants; public ObservableCollection<string> Participants

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{ get { return _Participants; } set { _Participants = value; if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs("Participants")); } } //collection of all messages exchanged in a particular conversation private ObservableCollection<TextMessage> _Conversation; public ObservableCollection<TextMessage> Conversation { get { return _Conversation; } set { _Conversation = value; if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs("Conversation")); } } //IP Address of the server connected to private string _IP; public string IP { get { return _IP; } set { _IP = value; if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs("IP")); } } //Port connected to private string _Port; public string Port { get { return _Port; } set { _Port = value; if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs("Port")); } }

//name of the person logged in private string _Me; public string Me { get { return _Me; } set { _Me = value; if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs("Me")); } } //the other person in a conversation private string _TalkingTo; public string TalkingTo { get { return _TalkingTo; } set { _TalkingTo = value; if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs("TalkingTo")); } } //the body of a conversation message private string _MessageBody; public string MessageBody { get { return _MessageBody; } set { _MessageBody = value; if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs("MessageBody")); } } //buffer used to receive messages private const int RECEIVEBUFFERSIZE = 10 * 1024; private byte[] ReceiveBuffer = new Byte[RECEIVEBUFFERSIZE]; //constructor public ClientConnectionManager() { //initialize the collections Participants = new ObservableCollection<string>();

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Conversation = new ObservableCollection<TextMessage>(); } //called when the login button is clicked public void Join() { //create a new SocketEventArgs, specify the remote endpoint details SocketAsyncEventArgs sockEvtArgs = new SocketAsyncEventArgs { RemoteEndPoint = new IPEndPoint(IPAddress.Parse(IP), Convert.ToInt32(Port)), UserToken = Me }; //connect a completion handler sockEvtArgs.Completed += new EventHandler<SocketAsyncEventArgs>(Connection_Completed); //connect asynchronously ClientSocket.ConnectAsync(sockEvtArgs); } //connection completion handler void Connection_Completed(object sender, SocketAsyncEventArgs e) { //connected successfully, send a //ConnectionDisconnectionRequest with Connect=true if (e.SocketError == SocketError.Success) { SocketAsyncEventArgs sockEvtArgs = new SocketAsyncEventArgs { UserToken = e.UserToken }; //serialize a new ConnectionDisconnectionMessage into a MemoryStream MemoryStream SerializedStream = MessageWrapper.SerializeMessage( new MessageWrapper { Message = new ConnectionDisconnectionRequest { From = e.UserToken as string, Connect = true } }); //set buffer to the contents of the memorystream sockEvtArgs.SetBuffer(SerializedStream.GetBuffer(), 0, (int)SerializedStream.Length); sockEvtArgs.Completed += new EventHandler<SocketAsyncEventArgs>(ConnectionRequestSend_Completed);

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