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In the past, Windows developers were forced to choose between convenience and flexibility For maximum convenience, they could use prebuilt controls These controls worked well enough, but they offered limited customization and almost always had a fixed visual appearance Occasionally, some controls provided a less than intuitive owner drawing mode that allowed developers to paint a portion of the control by responding to a callback But the basic controls buttons, text boxes, check boxes, list boxes, and so on were completely locked down As a result, developers who wanted a bit more pizzazz were forced to build custom controls from scratch This was a problem not only was it slow and difficult to write the required drawing logic by hand, but custom control developers also needed to implement basic functionality from scratch (such as selection in a text box or key handling in a button).

If the work required in the model is more involved than updating a database row or displaying the result of a simple mathematical equation, you may wish to decouple the model from the view but omit the ViewModel. The model will then perform two tasks in one: both model and ViewModel. Figure 3 7 shows the view and model split into two assemblies.

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And even once the custom controls were perfected, inserting them into an existing application involved a fairly significant round of editing, which would usually necessitate changes in the code (and more rounds of testing) In short, custom controls were a necessary evil they were the only way to get a modern, distinctive interface, but they were also a headache to integrate into an application and support WPF finally solves the control customization problem with styles (which you considered in 11) and templates (which you ll begin exploring in this chapter) The reason these features work so well is because of the dramatically different way that controls are implemented in WPF In previous user interface technologies, such as Windows Forms, commonly used controls aren t actually implemented in NET code Instead, the Windows Forms control classes wrap core ingredients from the Win32 API, which are untouchable.

But as you ve already learned, in WPF every control is composed in pure NET code, with no Win32 API glue in the background As a result, it s possible for WPF to expose mechanisms (styles and templates) that allow you to reach into these elements and tweak them In fact, tweak is the wrong word because, as you ll see in this chapter, WPF controls allow the most radical redesigns you can imagine..

What s New WPF 4 adds a new visual state model to help you restyle controls more easily. This model

lthough the core focus of this book is on using information cards in conjunction with Microsoft technologies, this is not your only choice. Information cards have no affinity to platform or vendor, so in this chapter you ll explore the resources that are available for other development platforms. This chapter will begin with a look at how to use two of the available relying party code libraries, one Java-based and one PHP-based. This will be followed by a review of other relying parties that are available and how to find them. It is important to note that the content for this chapter is different from the other chapters of this book. This is primarily because of the multitude of development environments and web servers for these other languages. C# and ASP.NET have a single tool that is used by most developers, Visual Studio. They also have a single web server that is used by the vast majority of developers, IIS. For Java, PHP, and Ruby, on the other hand, there is not a single development tool or web server. As a result, the format of this chapter will be different from what you ve seen elsewhere in the book. Although other chapters have taken you step by step through configuring your server, creating projects in the IDE, and identifying menu locations and where to right-click, this chapter will focus squarely on overviews and code and not on IDE-specific steps or server configuration. If you have not read the prior 12 chapters because of the Microsoft technology focus, the chapter will begin with a quick refresher on how the relying party requests and later processes a token.

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