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//send ClientSocket.SendAsync(sockEvtArgs); } } //ConnectionDisconnectionRequest send completion handler void ConnectionRequestSend_Completed(object sender, SocketAsyncEventArgs e) { //sent successfully if (e.SocketError == SocketError.Success) { //start receiving messages ReceiveMessage(); //switch context ParentPage.Dispatcher.BeginInvoke(new Action(delegate { //switch view to participants ParentPage.ShowParticipantsView(); })); } } //receive a message private void ReceiveMessage() { SocketAsyncEventArgs sockEvtArgsReceive = new SocketAsyncEventArgs(); sockEvtArgsReceive.SetBuffer(ReceiveBuffer, 0, RECEIVEBUFFERSIZE); sockEvtArgsReceive.Completed += new EventHandler<SocketAsyncEventArgs>(Receive_Completed); ClientSocket.ReceiveAsync(sockEvtArgsReceive); } //receive completion handler void Receive_Completed(object sender, SocketAsyncEventArgs e) { if (e.SocketError == SocketError.Success) { ParentPage.Dispatcher.BeginInvoke(new Action(delegate { //copy the message to a temporary buffer - this is //because we reuse the same buffer for all SocketAsyncEventArgs, //and message lengths may vary byte[] Message = new byte[e.BytesTransferred]; Array.Copy(e.Buffer, 0, Message, 0, e.BytesTransferred); //process the message ProcessMessage(Message); //keep receiving ReceiveMessage();

In addition, the page component is another space owner in this example. In this ID space, page is the space owner, and winA, *vboxE, and *labelF are its fellow components. The relationship among these components is illustrated in Figure 4-4.

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})); } } //process a message internal void ProcessMessage(byte[] Message) { //deserialize the message into the wrapper MessageWrapper mw = MessageWrapper.DeserializeMessage(Message); //check type of the contained message //correct type resolution is ensured through the //usage of KnownTypeAttribute on the MessageWrapper //data contract declaration if (mw.Message is TextMessage) { //receiving a text message from someone //switch to chat view if not there already ParentPage.ShowChatView(); //remember the other party in the conversation if (this.TalkingTo == null) this.TalkingTo = (mw.Message as TextMessage).From; //data bind the text of the message Conversation.Add(mw.Message as TextMessage); } //someone has ended an ongoing chat else if (mw.Message is ChatEndNotification) { //reset this.TalkingTo = null; //reset Conversation.Clear(); //go back to participants list ParentPage.ShowParticipantsView(); } //server has sent a reply to your connection request else if (mw.Message is ConnectionReply) { //reset Participants.Clear(); //get the list of the other participants List<string> ReplyList = (mw.Message as ConnectionReply).Participants; //data bind foreach (string s in ReplyList) Participants.Add(s); }

//someone has connected or disconnected else if (mw.Message is ConnectionDisconnectionNotification) { ConnectionDisconnectionNotification notif = mw.Message as ConnectionDisconnectionNotification; //if it is a connection if (notif.Connect) //add to participants list Participants.Add(notif.Participant); else { //remove from participants list Participants.Remove(notif.Participant); //if you were in a conversation with this person, //go back to the participants view if (notif.Participant == TalkingTo) { ParentPage.ShowParticipantsView(); } } } } //send a text message internal void SendTextMessage() { //package the From, To and Text of the message //into a TextMessage, and then into a wrapper MessageWrapper mwSend = new MessageWrapper { Message = new TextMessage { From = Me, To = TalkingTo, Body = MessageBody } }; //serialize MemoryStream SerializedStream = MessageWrapper.SerializeMessage(mwSend); SocketAsyncEventArgs sockEvtArgsSend = new SocketAsyncEventArgs { UserToken = mwSend.Message }; //grab the byte[] and set the buffer sockEvtArgsSend.SetBuffer( SerializedStream.GetBuffer(), 0, (int)SerializedStream.Length); //attach handler sockEvtArgsSend.Completed += new EventHandler<SocketAsyncEventArgs>(SendTextMessage_Completed); //send ClientSocket.SendAsync(sockEvtArgsSend);

} //send completed void SendTextMessage_Completed(object sender, SocketAsyncEventArgs e) { //success if (e.SocketError == SocketError.Success) { //switch context ParentPage.Dispatcher.BeginInvoke(new Action(delegate { //send was successful, add message to ongoing conversation Conversation.Add(e.UserToken as TextMessage); //reset edit box MessageBody = ""; })); } } //disconnect internal void Disconnect() { SocketAsyncEventArgs sockEvtArgs = new SocketAsyncEventArgs(); //package a ConnectionDisconnectionRequest with Connect=false MemoryStream SerializedStream = MessageWrapper.SerializeMessage( new MessageWrapper { Message = new ConnectionDisconnectionRequest { From = Me, Connect = false } }); sockEvtArgs.SetBuffer( SerializedStream.GetBuffer(), 0, (int)SerializedStream.Length); sockEvtArgs.Completed += new EventHandler<SocketAsyncEventArgs>(DisconnectRequest_Completed); ClientSocket.SendAsync(sockEvtArgs); } //disconnect completed void DisconnectRequest_Completed(object sender, SocketAsyncEventArgs e) { //success if (e.SocketError == SocketError.Success) { //reset my identity

this.Me = null; //clear all participants Participants.Clear(); //show login screen ParentPage.ShowLoginView(); } } //end a chat internal void SendChatEnd() { MessageWrapper mwSend = new MessageWrapper { Message = new ChatEndNotification { From = Me, To = TalkingTo } }; MemoryStream SerializedStream = MessageWrapper.SerializeMessage(mwSend); SocketAsyncEventArgs sockEvtArgsSend = new SocketAsyncEventArgs { UserToken = mwSend.Message }; sockEvtArgsSend.SetBuffer( SerializedStream.GetBuffer(), 0, (int)SerializedStream.Length); sockEvtArgsSend.Completed += new EventHandler<SocketAsyncEventArgs>(SendChatEnd_Completed); ClientSocket.SendAsync(sockEvtArgsSend); } //chat ended void SendChatEnd_Completed(object sender, SocketAsyncEventArgs e) { //success if (e.SocketError == SocketError.Success) { //switch context ParentPage.Dispatcher.BeginInvoke(new Action(delegate { //reset identity of the other participant this.TalkingTo = null; //clear the conversation Conversation.Clear(); //switch back to the participants view ParentPage.ShowParticipantsView(); })); } } } }

list using ZUML without having to code any JavaScript. Listing 6-1 is a code snippet extracted from index.zul. The fish-eye list is defined by a <fisheyelist> tag, and there are a lot of properties to define the behavior and appearance of this list. Each child component of the fish-eye list is defined by a <fisheyeitem> tag, and the image property allows you to assign an image file for each of the child fisheyeitem components.

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