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Almost all UIs use common elements throughout an application. In order to simplify the use and interaction of these common elements, the Composite UI Application Block supports the development of user interface components called UIElements. UIElements include menus, status bars, progress bars, toolbars, notification tray icons, and so on. Typically, the shell developer will create the UIElement component, and the module developers will use it. To handle the manipulation of a UIElement, a specialized adapter called the IUIElementAdapter must be defined. The IUIElementAdapter contains the members that a UIElement adapter should support. The IUIElementAdapter contains two methods that must be implemented: the Add and Remove methods. An implementation class named UIElementAdapter provides generic methods for satisfying this interface. Currently, the Composite UI Application Block contains two UIElement adapters: * ToolStripItemOwnerCollectionUIAdapter: Provides an adapter where new System. Windows.Forms ToolStripItems will be added to an existing ToolStripItems collection. * ToolStripItemCollectionUIAdapter: Provides an adapter for wrapping the System. Windows.Forms.ToolStripCollection class for use by an instance of the IUIElementAdapter interface. UIExtensionSites are a collection of elements contained within a WorkItem class that allow you to access and manage UIElements through their registered adapters. You must specify the name of the site (typically a URI string) when registering adapters. Other components and code will use the site name to reference the UIElements contained within a UIExtensionSite.

Figure 3-3. The image file to use for the cowboy Sprite The tumbleweed image file consists of three frames that give a rolling animation when shown in sequence (see Figure 3-4).

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Many applications have common functionality that can be invoked from more than one component within an application. To simplify these tasks, the Composite UI Application Block provides commands that work hand and hand with UIElements. These commands provide a simplified interface to invoke UIElements. You can specify that one command event handler can be associated with more than one UIElement or vice versa. The use of the CommandHandlerAttribute attribute associates a command with a specific method. The WorkItem class contains a property called Commands. This property is a collection of commands that are registered and handled by the framework. The Command object contains an AddInvoker method that allows you to wire up an event to that specific command. Here is an example of creating a command: [CommandHandler("ShowError")] public void ShowName(object sender, EventArgs e) { MessageBox.Show("Sorry you are not allowed to do this."); } And here is how you could add an event to the preceding command: MyWorkItem.Commands["ShowName"].AddInvoker(item, "MouseOver");

CHAPTER 8 JOHNNXT IS ALIVE!

The Connection Monitor Application Block was developed to help application developers determine changes in network connectivity. This way, developers can handle both online and offline scenarios within their applications. Using the Connection Monitor Application Block, you can determine if a particular network resource is available. The application block can determine the availability of resources on both physical and logical networks. A logical network could be a corporate intranet or home network. A physical network consists of the actual network adapters. The core component of the Connection Monitor Application Block is the ConnectionMonitor class. This class contains a collection of Connection and Network objects that are to be monitored. You create an instance of the ConnectionMonitor class via the ConnectionMonitorFactory class. This factory class allows you to specify a string indicating the correct configuration section within an application configuration file to use to determine which network resources to monitor. If a string is not specified, the default configuration section will be used.

Figure 3-4. The tumbleweed image The way to select which frame is shown at any given time is intuitive. First, if your image file comprises multiple images (as these two do), you should construct the Sprite with the constructor that specifies the width and height (in pixels) that you d like your Sprite to be. The width and height of the Image should be integer multiples of the width and height you send to the constructor. In other words, the computer should be able to divide your image file evenly into rectangles of the size you specify. As you can see from the previous examples, you

CHAPTER 8 JOHNNXT IS ALIVE!

The ConnectionMonitor class contains a NetworkCollection property called Networks. This NetworkCollection contains all of the networks that are to be monitored. The NetworkCollection class allows for a network strategy to determine how it will determine the connection availability. By default, the HttpPingStatusStrategy is used to determine connection availability, but it is also possible to create a custom strategy. The named ConnectionMonitor can then be configured within the application configuration file to use the custom network strategy.

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