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Views can be created and displayed in the locations either automatically through view discovery, or programmatically through view injection. These two techniques determine how individual views are mapped to named locations on the application UI. View Discovery In view discovery, you set up a relationship in the RegionViewRegistry between a region s name and the type of a view. When a region is created, the region looks for all the View Types associated with the region and automatically instantiates and loads the corresponding views. Therefore, with view discovery, you do not have explicit control over when the views that correspond to a region are loaded and displayed. View Injection In view injection, your code obtains a reference to a region, and then programmatically adds a view into it. Typically, this is done when a module initializes or as a result of a user action. Your code will query a RegionManager for a specific region by name and then inject views into it. With view injection, you have more control over when views are loaded and displayed. You also have the ability to remove views from the region. However, with view injection, you cannot add a view to a region that has not yet been created. Navigation The Prism Library 4.0 contains Navigation APIs. The Navigation APIs simplify the view injection process by allowing you to navigate a region to an URI. The Navigation API instantiates the view, adds it to the region, and then activates it. Additionally, the Navigation API allows navigating back to a previously created view contained in a region. For more information about the Navigation APIs, see the next chapter, Navigation. When to Use View Discovery vs. View Injection Choosing which view loading strategy to use for a region depends on the application requirements and the function of the region. Use view discovery in the following situations: Automatic view loading is desired or required. Single instances of a view will be loaded into the region. Use view injection in the following situations: Your application uses the Navigation APIs. You need explicit or programmatic control over when a view is created and displayed, or you need to remove a view from a region; for example, as a result of application logic or navigation. You need to display multiple instances of the same views in a region, and each view instance is bound to different data. You need to control which instance of a region a view is added to. For example, you want to add a customer detail view to a specific customer detail region. (This scenario requires implementing scoped regions as described later in this chapter.)
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In composite applications, views from multiple modules are displayed at run time in specific locations on the application UI. To achieve this, you need to define the locations in which the views will appear and you need to specify how the views will be created and displayed in those locations. The decoupling of the view and the UI location in which it will be displayed allows the appearance and layout of the application to evolve independently of the views that appear within the region. The next sections describe the core scenarios that you will encounter when you develop a composite application. When appropriate, examples from the Stock Trader RI will be used to demonstrate a solution for the scenario. The shell is the application root object in which the primary UI content is contained. In a Windows Presentation Foundation (WPF) application. The shell is the Window object. In a Silverlight application, the shell is the RootVisual UserControl. A shell can contain named regions in which modules can specify the views that will appear. It can also define certain top-level UI elements, such as the main menu and toolbar. The shell defines the overall structure and appearance for the application, and is similar to an ASP.NET master page control. It could define styles and borders that are present and visible in the shell layout itself, and it could also define styles, templates, and themes that are applied to the views that are plugged into the shell. You do not need to have a distinct shell as part of your application architecture to use the Prism Library. If you are building a completely new composite application, implementing a shell provides a well-defined root and initialization pattern for setting up the main UI of your application. However, if you are adding Prism Library features to an existing application, you do not have to change the basic architecture of your application to add a shell. Instead, you can alter your existing window definitions or controls to add regions that can pull in views as needed. You can also have more than one shell in your application. If your application is designed to open more than one top-level window for the user, each top-level window acts as shell for the content it contains. Stock Trader RI Shell The WPF Stock Trader RI has a shell as its main window. In the following illustration, the shell and views are highlighted. The shell is the main window that appears when the Stock Trader RI starts and which contains all the views. It defines the regions into which modules add their views and a couple of top-level UI items, including the CFI Stock Trader title and the Watch List tear-off banner.
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