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Text The text to display for the link URI Where to navigate to when the link is clicked
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We want both of these properties to be bindable so that we can use the new control in the context of an application data-binding target. In your new application, right-click your project and select Add User Control. Name the new control LinkLabel. In the designer, you ll now be faced with something similar to what you see when you create a new application, but there s no window frame around it (figure 13.1). We don t really need the Grid at all, and the Hyperlink isn t available in the Toolbox, so we need to go to the XAML to set up this control. Most user controls will consist of a number of controls put together with a layout, but ours is just a specialized Hyperlink with predefined behavior. Remove the Grid elements from the
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Figure 13.1 Initially the UserControl is an empty 300x300 Grid, as seen in the designer.
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XAML, and replace them with a Hyperlink. Let Visual Studio help you by creating the
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event handler when you set the RequestNavigate attribute.
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<Hyperlink Name="webLink" RequestNavigate="Hyperlink_RequestNavigate" />
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Next, get rid of the Width and Height of the user control. We want the LinkLabel to take up only the space that it needs to display the Hyperlink. Now your XAML should look like this:
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<UserControl x:Class="ControlsInAction.LinkLabel" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"> <Hyperlink Name="webLink" RequestNavigate="Hyperlink_RequestNavigate" /> </UserControl>
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All you ll see in the designer is a vertical bar with crosses on each end. This is OK because there s nothing for it to display. Now it s all about the code. Right-click the LinkLabel.xaml file and select View Code. Because we want to use this control to bind to URIs, the first thing we ll need are properties for the text of the link and the URI itself (listing 13.1).
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Listing 13.1 Adding dependency properties to LinkLabel.xaml.cs
public static readonly DependencyProperty TextProperty = DependencyProperty.Register("Text", typeof(string), typeof(LinkLabel), new FrameworkPropertyMetadata( new PropertyChangedCallback(OnTextChanged))); public string Text No backing field { get { return (string)GetValue(TextProperty); } set { SetValue(TextProperty, value); } } public static readonly DependencyProperty UriProperty = DependencyProperty.Register("Uri", typeof(string), typeof(LinkLabel), new FrameworkPropertyMetadata(new PropertyChangedCallback(OnUriChanged))); public string Uri { get { return (string)GetValue(UriProperty); } set { SetValue(UriProperty, value); } }
Establishes custom dependency property
Uses metadata to create callback
URI property
This is rather more involved than the old field with a getter and setter for a property that you might normally write in C#. The complexity is needed for the properties to play nice with the Property System. Let s look at the Text property in detail the Uri property is nearly identical e. If you look at the Text property declaration d, you ll see that getter and setters are calling GetValue and SetValue, rather than returning the value from some private member variable (technically referred to as a backing field) such as
private string textValue = "";
Composing new user controls
The GetValue and SetValue reference the dictionary of property values held by the object. To look things up in that dictionary, we have to have a key. Now, if the world were a simple place, that key would be a string of the name of the property or something like that, but the world isn t a simple place. The key used by the Property System has to do double duty not only is it the key, but it also defines a whole bunch of behavior about the property; this behavior is held in an object of type DependencyProperty. By convention, the DependencyProperty is named PropertyNameProperty; in this case, the DependencyProperty is called TextProperty b. Now, in its simplest form, the definition for a DependencyProperty can be reasonably straightforward. For example, we could do this:
public static readonly DependencyProperty TextProperty = DependencyProperty.Register("Text", typeof(string),typeof(LinkLabel));
The DependencyProperty key objects are almost always static members of the class that defines the property they need to be static so that they exist before they re used, and so that the same instance is used by all code that references the property. To create a new DependencyProperty, the minimum we have to do is call the DependencyProperty s Register method and pass the name of the property (Text), the type of data held by the property (string), and the name of the class registering the property (LinkLabel). But, we want to do one more thing than the minimum we want to know whenever the value of the property has changed so that we can update our UI. One easy way to do this is to register an event handler with the property c. The notation for this is a little odd because the register method doesn t have an overload that takes the handler. Instead, we can pass a FrameworkPropertyMetadata object that describes additional things about the property, including a callback for when the property has changed. Listing 13.2 shows the event handlers for when the Text and the Uri properties change.
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