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10.6 A cleaner custom command implementation
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We can go pretty far with the built-in set of commands, but if we wanted, for some crazy reason, to add some custom functionality to our application, we d like a clean way to do it. One thing that we d like to do, for example, is provide a way of turning the currently selected text in our wiki into a new link. We checked there s no built-in command for that.
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10.6.1 Implementing a RoutedUICommand In a traditional wiki, a link is created by Pascal-casing a word. For example, if you were to write RoutedCommand, it would become a link automatically because .NET classes are Pascal-cased by the same convention. It s also useful (and arguably more friendly) to
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They are often instances of SecureUICommand, which is a RoutedUICommand with some Permission stuff sprinkled on, but that s a secret type we don t get to use!
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A cleaner custom command implementation
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select some text and turn it into a document link, and we want to create a command to do that. Because we re a rich client with a Rich (with a capital R) text box, we may also want to handle our wiki conventions beyond simple character conventions. We need the following characteristics from this command:
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The command should be unavailable when no text is highlighted. The command text should display a portion of the text to turn into a link when text is selected. Only text selected in the RichTextBox for editing pages should make the command available.
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CREATING A STATIC CLASS TO HOLD THE COMMAND
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The first step is to give our command a new home. Instead of shoving the command into our main window as we did before, we ll follow the pattern established by WPF and create a static command class, with our command as a member. To do this, we add a new class to the WikiInAction project, call it WikiCommands, and add the code from listing 10.2.
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Listing 10.2 Our custom commands class
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using System.Windows.Input; namespace WikiInAction { public static class WikiCommands { private static RoutedUICommand createLinkFromSelection; static WikiCommands() { createLinkFromSelection = new RoutedUICommand( "Create Link from Selection", "CreateLinkFromSelection", typeof(WikiCommands)); }
Our command
Initializes the command
public static RoutedUICommand CreateLinkFromSelection { get { return createLinkFromSelection; } } } }
Command property
We have a static RoutedUICommand b to hold the single instance of the command. Unlike our previous example, this is a private member variable, and we re exposing the command as a property d. Because we re using a property, we could lazy-initialize the command only create it when it s needed but we d have to make sure the code was thread-safe and so on; because we don t have many commands, we re keeping it simple. The initialization of our command is being done in the static constructor for our class c. Although not strictly required, we re passing several arguments to the
Commands
constructor default descriptive text for the command, a name for the command, and the class that s registering the class. Now that we ve got our custom command, we need to figure out how to hook it up and make it work with a control that s never heard nuthin bout no wikis.
10.6.2 Adding a CommandBinding Every UIElement and ContentElement in WPF (which is essentially everything you can see and much of what you can t) can receive a command. Obviously, our RichTextBox knows commands, but it doesn t know our command. We re going to graft our command on after the fact. Now we could be lazy and graft it onto the main Window element after all, the command will bubble up and eventually reach the RichTextBox. But that s pretty inefficient because we know that it s the only control that will be involved in this command.
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