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Visual designers are graphical applications that allow you to design interfaces using a visual metaphor Controls are dragged and dropped onto forms and then configured through a property window Visual Studio 2005 provides a visual designer, though it is not available for all the programming languages The language must expose a CodeDom provider, and at the time of writing F# does not yet provide one that is sufficiently powerful for this purpose However, using the Visual Studio designer is still a useful way to explore controls and to play with their properties, and the generated C# fragments can be examined and used in F# code To understand how the Visual Studio designer works, we ve designed the same browser application in C# as shown in Figure 11-2 The Visual Studio designer generates, for the form Browser, a C# file named BrowserDesigner.

Before we look at DOM methods for adding markup to a document in the web browser, let s briefly review a couple techniques that developers have used in the past: document.write and innerHTML.

The ValidationRules class is the primary class in the Csla.Validation namespace. Every business object that uses the validation rules functionality will contain its own ValidationRules object. ValidationRules relies on the other classes in Csla.Validation to do its work. Together, these classes maintain the list of rules for each property and the list of currently broken rules.

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cs containing all the C# code required to set up the interface If you look at that file, you can see that it contains mainly the assignments of control properties similar to those you manually used to prepare the browser form Until the Windows Forms designer or another visual designer is available for F#, there are essentially four options for building graphical interfaces in the language: Write the interface code by hand, as you did for the browser sample Develop a visual designer that outputs F# code (though it is a hard job) and use it Use the C# visual designer, and then convert the assignments in fileDesignercs into F# Exploit the interoperability of the NET platform by designing the interface with the designer, generating C# or another supported language and using the F# code as a library.

You ve already seen how a business rule is defined based on the RuleHandler delegate. A key part of what ValidationRules does is keep a list of such rule methods for each of the business object s properties.

You can easily define simple interfaces with F# code, and we show how in the rest of this chapter We now focus on the more important part in the design of graphical applications: drawing and control development..

Remember that each rule method accepts a target parameter, which is the object containing the data to be validated. This target is always the business object, so ValidationRules keeps a reference to the business object. This reference is provided via the constructor and can be reset through the SetTarget() method both of which you ve seen in the implementation of Csla.Core.BusinessBase: [NonSerialized()] private object _target; internal ValidationRules(object businessObject) { SetTarget(businessObject); } internal void SetTarget(object businessObject) { _target = businessObject; } Notice that the _target field is marked as [NonSerialized()]. This is important because otherwise the BinaryFormatter would trace the circular reference between the business object and the ValidationRules object, causing a bloated serialization byte stream. No failure would result, but the size of the byte stream would be larger than needed, which might cause a performance issue in some cases.

The write method of the document object provides a quick and easy way to insert a string into a document. Let s see how this works. Save the following markup as a file. Call it something like test.html. <!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8" /> <title>Test</title>

So far you ve developed graphical applications based on the composition of predeveloped graphical controls, but what do you do if no graphical control suits your needs You need to learn how to draw using the drawing primitives provided by the graphical system. To understand how drawing works, you need to review the model lying behind the rendering process of a graphical application. You know already that the event-driven programming paradigm is the one that best suits graphical applications; so far you have associated event handlers with user actions, but events are used by the graphical system as a general mechanism to communicate with the graphical application. An application uses resources provided by the graphical system, and these resources are mostly windows. A window is simply a rectangular area on the screen, not necessarily a toplevel window with buttons, a title bar, and all the amenities you usually associate with it. Windows can be nested and are the unit of traditional windowing systems. Windows can contain other windows, and the windowing system is responsible for ensuring that events are routed to the callbacks registered for handling the events for each window.

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