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With most Ajax frameworks, the role of server is passive, since it is responsible only for providing and accepting data after receiving requests from the client side. The communication between components is quite complex and requires a lot of JavaScript programming, not to mention the problem of incompatibility among JavaScript and browsers. By contrast, in ZK s solution, all the components are created on the server side, which makes communication between components easier since you can access these components directly on the server side. Moreover, the way components communicate with each other is event driven, which means interaction can be triggered by a user s activities on the client side or events sent from other components. In short, ZK mirrors the simplicity of developing desktop applications in the development of web applications and gives users more interactivity and more responsiveness.

Listing 7-31. The Message custom type in Messages.cs using using using using System.Collections.Generic; System.IO; System.Runtime.Serialization; System.Text;

namespace Recipe7_7.SD { public enum MessageType { ItemRemoved, ItemsValueChanged } [DataContract] public class Message { [DataMember] public MessageType MsgType { get; set; } [DataMember] public List<Spending> Items { get; set; } public static string Serialize(Message Msg) { DataContractSerializer dcSer = new DataContractSerializer(typeof(Message)); MemoryStream ms = new MemoryStream(); dcSer.WriteObject(ms, Msg); ms.Flush(); string RetVal = Encoding.UTF8.GetString(ms.GetBuffer(), 0, (int)ms.Length); ms.Close(); return RetVal; } public static Message Deserialize(string Msg) { DataContractSerializer dcSer = new DataContractSerializer(typeof(Message)); MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(Msg)); Message RetVal = dcSer.ReadObject(ms) as Message; ms.Close(); return RetVal; } } }

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You handle two kinds of messages in the local connection implementation between the worksheet and the graph applications, as defined in the MessageType enumeration. The MessageType.ItemRemoved value indicates a message that communicates the removal of one or more items; it is sent from the worksheet to the graph only when rows are removed from the worksheet. The MessageType.ItemsValueChanged typed message can be sent in either direction when the values of one or more items change either in the worksheet for an existing item or a newly added item through user edits, or in the graph when the user drags a bar to resize it. The Message class contains the MessageType and a list of Items with changed values or a list of Items that were removed. It also defines two static methods that use DataContractSerialization to serialize and deserialize instances of the Message type to and from a string representation. Note that you have the Message class attributed as a DataContract with the Mistyped and Items properties attributed as DataMember. An individual data item for the application is defined as a class named Spending, and a custom class named SpendingCollection deriving from ObservableCollection<Spending> defines the data collection that initially populates the worksheet and the graph. These classes are not changed much from Recipe 4-4, so we do not cover them in detail. Listing 7-32 shows these classes. Listing 7-32. Data classes in DataClasses.cs using System.Collections.ObjectModel; using System.ComponentModel; using System.Linq; using System.Runtime.Serialization; namespace Recipe7_7.SD { public class SpendingCollection : ObservableCollection<Spending> { public SpendingCollection() { this.Add(new Spending { ParentCollection = this, ID = 1, Item = "Utilities", Amount = 300 }); this.Add(new Spending { ParentCollection = this, ID = 2, Item = "Food", Amount = 350 }); this.Add(new Spending { ParentCollection = this, ID = 3,

what you do. 8 Elevating a web programming framework to a thing of beauty, happiness, and motivation may seem like hubris, but it s very appealing and sure differentiates their company. In propagating the narrative of Ruby on Rails as Happiness, they re practically guaranteeing that at least some developers out there will be looking for Ruby on Rails jobs. But 37signals is still new at this identity management campaign thing. They don t hold a candle to Apple Computer, which, with a single Super Bowl ad in 1984, managed to cement their position to this day as the countercultural force of freedom against dictatorship, of liberty against oppression, of colors against black and white, of pretty women in bright red shorts against brainwashed men in suits. The implications of this, I m afraid, are ironically Orwellian: giant corporations manipulating their public image in a way which doesn t even make sense (like, uh, they re a computer company what the hell does that have to do with being against dictatorships ) and successfully creating a culture of identity that has computer shoppers around the world feeling like they re not just buying a computer, they re buying into

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