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In some cases the clean window-by-window separation isn t suitable. For example, you might want to place WPF content in an existing form alongside Windows Form content. Although this model is conceptually messier, WPF handles it quite gracefully. In fact, including Windows Forms content in a WPF application (or vice versa) is more straightforward than adding ActiveX content to a Windows Forms application. In the latter scenario, Visual Studio must generate a wrapper class that sits between the ActiveX control and your code, which manages the transition from managed to unmanaged code. This wrapper is component-specific, which means each ActiveX control you use requires a separate customized wrapper. And because of the quirks of COM, the interface exposed by the wrapper might not match the interface of the underlying component exactly. When integrating Windows Forms and WPF content, you don t need a wrapper class. Instead, you use one of a small set of containers, depending on the scenario. These containers work with any class, so there s no code generation step. This simpler model is possible because even though Windows Forms and WPF are dramatically different technologies, they are both firmly grounded in the world of managed code. The most significant advantage of this design is that you can interact with Windows Forms controls and WPF elements in your code directly. The interoperability layer comes into effect only when this content is rendered in the window. This part takes place automatically without requiring any developer intervention. You also don t need to worry about keyboard handling in modeless windows because the interoperability classes you ll use (ElementHost and WindowsFormsHost) handle that automatically.

ow that I ve covered the basics of authentication, authorization, and federation, it s time to dive in and start using CardSpace. In this chapter, you ll take a tour of CardSpace and become familiar with it from a user perspective. By the conclusion of the chapter, you ll have become familiar with the CardSpace user experience, you ll have created a self-issued card, and you ll have used that card to connect to several sites. And to showcase the interoperability of CardSpace and information cards, one of those sites will be using Windows to access your information card and the other will be using Java.

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To integrate WPF and Windows Forms content in the same window, you need to be able to segregate a portion of your window for foreign content. For example, it s completely reasonable to throw a 3-D graphic into a Windows Forms application because you can place that 3-D graphic in a distinct region of a window (or even make it take up the entire window). However, it s not easy or worthwhile to reskin all the buttons in your Windows Forms application by making them WPF elements, because you ll need to create a separate WPF region for each button. Along with the considerations of complexity, there are also some things that just aren t possible with WPF interoperability. For example, you can t combine WPF and Windows Forms content by overlapping it. That means you can t have a WPF animation send an element flying over a region that s rendered with Windows Forms. Similarly, you can t overlap partially transparent Windows Forms content over a WPF region to blend them together. Both of these violate what s known as the airspace rule, which dictates that WPF and Windows Forms must always have their own distinct window regions, which they manage exclusively. Figure 30-3 shows what s allowed and what isn t.

Technically, the airspace rule results from the fact that in a window that includes WPF content and Windows Forms content, both regions have a separate window handle, or hwnd. Each hwnd is managed, rendered, and refreshed separately. Window handles are managed by the Windows operating system. In classic Windows applications, every control is a separate window, which means each control has ownership of a distinct piece of screen real estate. Obviously, this type of window isn t the same as the top-level windows that float around your screen it s simply a self-contained region (rectangular or otherwise). In WPF, the model is dramatically different there s a single, top-level hwnd, and the WPF engine does the compositing for the entire window, which allows more pleasing rendering (for example, effects such as dynamic antialiasing) and far greater flexibility (for example, visuals that render content outside their bounds).

Note There are a few WPF elements that use separate window handles. These include menus, tooltips, and the drop-down portion of a combo box, all of which need the ability to extend beyond the bounds of the window.

08/02/2010 11/10/2010 10/02/2010

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