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odels and views are design patterns that frequently occur in software of all types. By separating the data into a model and rendering that model to the users through views, a robust and reusable design is created. Models are used to describe the structures shown in Figure 5-1: lists, tables, and trees. A list is a one-dimensional vector of data. A table is a list, but with multiple columns a twodimensional data structure. A tree is simply a table, but with yet another dimension because data might be hidden inside other data. When you think about how to build applications, you will find that these structures can be used in almost all cases so you can build a model the represents your data structure in a good way. It is also important to remember that you need not change the way in which you actually store your data you can provide a model class that represents your data and then maps each item in the modeled data to an actual item in your application s data structures. All these structures can be shown in many different ways. For example, a list can be shown as a list (which shows all items at once) or as a combo box (which shows only the current item). Each value can also be shown in different ways for example, as text, values, or even images. This is where the view enters the picture its task is to show the data from the model to the user.

This separation allows for more fluid design and implementation of applications, as well as easier maintenance, updating, internationalization, and a whole host of other work streams that typically require redevelopment, recompilation, and redeployment Additionally, though no tools are available at this time, some will appear that allow applications to be visually designed and wired up to each other, generating Atlas Script As such, it will be a powerful and prevalent way of designing ASPNET applications in the future As this chapter progresses, you will see more sophisticated examples, continue to dissect them, and then stop to see exactly what you ve been seeing In the previous examples, you did some basic data binding binding actions to properties and performing internal binding within a control.

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Figure 5-1. A list, a table, and a tree In the classic model-view-controller (MVC) design pattern (see Figure 5-2), the model keeps the data, and the view renders it to a display unit. When the user wants to edit the data, a controller class handles all modifications of the data. Qt approached this pattern in a slightly different way. Instead of having a controller class, the view handles data updating by using a delegate class (see Figure 5-2). The delegate has two

the StateInitialization activity add a Sequence activity, leaving the default name. Within the Sequence activity, add two Code activities, one called Sequence1 and one called Sequence2. Generate the Handlers for each, and add a message box with the name of the activity in it. The code for these two subs is as follows: Private Sub Sequence1_ExecuteCode(ByVal sender As System.Object, ByVal e As System.EventArgs) MsgBox("Sequence 1") End Sub Private Sub Sequence2_ExecuteCode(ByVal sender As System.Object, ByVal e As System.EventArgs) MsgBox("Sequence 2") End Sub Finally, after the Sequence activity, but still within the StateInitialization activity, add a SetState activity called GoToLastState with a TargetStateName property of LastState. Your StateInitialization for the InitialState activity should look like Figure 4-9.

tasks: to help the view render each value and to help the view when the user wants to edit the value. Comparing the classic MVC pattern with Qt s approach, you can say that the controller and view have been merged, but the view uses delegates to handle parts of the controller s job.

In the next two examples, you will look at data binding in a little more detail and start exploring transforms, declarative and programmatic data binding, and directions of data binding You ll also look into how Atlas Script and JavaScript can work together to help you build the best, easiest-to-maintain application..

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