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//if there was a response else if (e.Response != null) { //the receiver sent a response - process it here } }); //start listening for incoming messages WorksheetReceiver.Listen(); } //handle add row button click private void btnAddItem_Click(object sender, RoutedEventArgs e) { //add a new Spending instance to the data source SpendingList.Add(new Spending() { ParentCollection = SpendingList }); } //handle a cell edit private void dgSpending_CellEditEnded(object sender, DataGridCellEditEndedEventArgs e) { //send a message WorksheetSender.SendAsync(Message.Serialize( new Message() { //message type - Item value changed MsgType = MessageType.ItemsValueChanged, //the changed Spending instance Items = new List<Spending> { e.Row.DataContext as Spending } })); } //remove the selected item private void btnRemoveItem_Click(object sender, RoutedEventArgs e) { //if there is a selected row if (dgSpending.SelectedItem != null) { //get the corresponding Spending instance Spending target = dgSpending.SelectedItem as Spending; //remove it from the data source SpendingList.Remove(target); //send a message WorksheetSender.SendAsync(Message.Serialize(

8. David Heinemeier Hansson, Rails steps into year three, www.loudthinking.com/arc/000594.html, August 6, 2006.

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new Message() { //message type - Item Removed MsgType = MessageTypeItemRemoved, //the item that was removed Items = new List<Spending> { target } })); } } } } As you can see, you start by creating a LocalMessageSender and a LocalMessageReceiver instance, respectively, named WorksheetSender and WorksheetReceiver, as members of the codebehind class WorksheetSender is created to let you send messages to a receiver named SpendingGraph, which is globally unique across all receivers on the page WorksheetReceiver registers this application as a receiver named SpendingWorksheet, again with a global namescope, and prepares to receive incoming messages from senders in any domain During construction, you attach handlers to WorksheetReceiverMessageReceived and WorksheetSenderSendCompleted In the MessageReceived handler, you deserialize the incoming message and then process it You only handle messages of type MessageTypeItemsValueChanged, because these are the only types of messages the HomeExpenseGraph application can generate.

As a part of the processing, if you do receive Spending instances that have changed, you replace them accordingly in the expense worksheet datasource In the SendCompleted handler, you show a skeletal set of statements for handling error conditions and response messages we leave it as an exercise for you to implement error handling and response correlation as needed In the Click event handler for the Button named btnAddItem, you add a new Spending item to the datasource However, you do not immediately send a message to the HomeExpenseGraph application, because the Spending item still does not have any meaningful data Instead, you use the CellEditEnded event handler to send item-change notifications In that handler, you construct a new Message instance with the changed Spending item as the only item in the MessageItems collection, and you set the MsgType property to MessageTypeItemsValueChanged.

Unlike other Ajax frameworks, which require a lot of knowledge about CSS, JavaScript, and DOM, ZK provides a shortcut for you to create Ajax-based web applications without learning other technologies, and developing ZK applications with ZUML requires you to know only a small amount about HTML. The ZK engine will handle the rest of the plumbing generating HTML, CSS, and JavaScript code. In addition, ZK makes it possible to develop web applications in an environment similar to desktop applications , since all components are also created on the server side. In other words, the relationship among components on the client side and components on server side

You then serialize the message and send it through the WorksheetSenderSendAsync() method In the Click handler for btnRemoveItem, you first remove the Spending instance bound to the selected DataGrid row from the datasource collection Then, you use the same approach to serialize and send a Message instance, with the MsgType property set to MessageTypeItemRemoved Let s look at the HomeExpenseGraph application Listing 7-34 shows the codebehind for the MainPage in that application Listing 7-34 The MainPage aodebehind in MainPagexamlcs for the HomeExpenseGraph application using using using using using using using System; SystemCollectionsGeneric; SystemWindows; SystemWindowsControls; SystemWindowsInput; SystemWindowsMessaging; SystemWindowsShapes;.

using Recipe7_7.SD; namespace Recipe7_7.HomeExpenseGraph { public partial class MainPage : UserControl { //variables to enable mouse interaction private bool MouseLeftBtnDown = false; private bool Dragging = false; Point PreviousPos; //data source SpendingCollection SpendingList = null; //create a sender LocalMessageSender GraphSender = new LocalMessageSender("SpendingWorksheet", LocalMessageSender.Global); //create a receiver LocalMessageReceiver GraphReceiver = new LocalMessageReceiver("SpendingGraph", ReceiverNameScope.Global, LocalMessageReceiver.AnyDomain); public MainPage() { InitializeComponent(); SpendingList = this.Resources["REF_SpendingList"] as SpendingCollection; //handle property changed for each Spending - this is used to send item //value changed messages foreach (Spending sp in SpendingList) { sp.PropertyChanged += new System.ComponentModel. PropertyChangedEventHandler(Spending_PropertyChanged); } //handle message receipts GraphReceiver.MessageReceived += new EventHandler<MessageReceivedEventArgs>((s, e) => { //deserialize message Message Msg = Message.Deserialize(e.Message); //if value changed if (Msg.MsgType == MessageType.ItemsValueChanged) { //for each changed Spending instance foreach (Spending sp in Msg.Items)

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