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STYLES, CONTROL TEMPLATES, AND CUSTOM USERCONTROLS
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Now if you press F5 to compile and run the application, you can put your mouse cursor over the UC_GreenButton UserControl, and it will turn red and back to green when your mouse leaves it.
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Demystifying the DependencyProperty
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Throughout this book, you have worked with many Silverlight controls such as Buttons, Rectangles, and MediaElements. Because you have worked with these controls and did things such as set the Source property of a MediaElement or the Fill property of a Rectangle, you already have experience in working with DependencyProperties because Fill and Source are DependencyProperties. So, in their simplest form, and trust me they can get much more complicated, DependencyProperties are properties that allow you to manage in C# or XAML how controls look and behave. DependencyProperties are unique in quite a few ways: DataBinding: When you bind to a DependencyProperty those bindings will automatically update if the property value changes. This will not be the case with a normal .NET property. Styles: Styles and Templates are two motivating factors in the decision to use a DependencyProperty over a regular .NET property. Styles interact with the property systems because they often contain setters for some of their properties. Typically, the most important property they set is the Template to define its visual appearance. Animations: In order for an object to be animated in Silverlight, the object s Target property must be a DependencyProperty. Property-changed Behavior: Silverlight DependencyProperties have the ability to specify a property-changed callback event. This allows the developer to respond and make changes whenever the value of a DependencyProperty changes. Default value and ClearValue: DependencyProperties allow you to specify a default value. This ensures that an acceptable value for your property will exist at all times. ClearValue can be used to set your DependencyProperty back to its default value. DependencyProperties must be registered: In order to make use of a DependencyProperty you must first register it, usually in C#. This allows you to have a highly customized DependencyProperty. For example, when you register a DependencyProperty you have options such as specifying a Callback method that will fire whenever the value of your DependencyProperty changes. To use this feature, you must specify the type of object the DependencyProperty is, such as String, ControlTemplate, and so on. Let s take a look at a simple Button with a Background DependencyProperty set to Blue and a Content DependencyProperty set to "Dependency Properties Rock!": <Button Background="Blue" Content="Dependency Properties Rock!"/> When you set the Background property to Blue, the XAML loader type converter converts it into a Silverlight Color using the SolidColorBrush. Silverlight provides a variety of ways syntactically for setting these properties in both XAML and C#. If you give the Button a Name, like this:
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<Button x:Name="MyButton" Background="Blue" Content="Dependency Properties Rock!"/> you can go into the code-behind file and set the Background property with code like this: // create a variable of the type SolidColorBrush // and set it to a new Red SolidColorBrush SolidColorBrush myBrush = new SolidColorBrush(Colors.Red); // apply the new variable to the Background of MyButton MyButton.Background = myBrush; This is all fine, and I am sure you understand DependencyProperties, but what if you have a situation where there is no DependencyProperty that meets your needs Say, for example, you want to be able to set the text on a custom UserControl. Sounds a lot like the issue we are having right now, doesn t it Well, for times like this, Silverlight allows us to register our very own custom DependencyProperties. We are going to have to open our ControlTemplateProject solution in Visual Studio 2010 to accomplish this feat. So fire up Visual Studio 2010, and let s open UC_GreenButton.xaml.cs and register our own custom DependencyProperty called GreenButtonsText: (you can see my newly added code in bold as follows): using using using using using using using using System.Windows; System.Windows.Controls; System.Windows.Documents; System.Windows.Ink; System.Windows.Input; System.Windows.Media; System.Windows.Media.Animation; System.Windows.Shapes;
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namespace ControlTemplateProject { public partial class UC_GreenButton : UserControl {
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#region GreenButtonsTextProperty DP public static readonly DependencyProperty GreenButtonsTextProperty = DependencyProperty.Register( "GreenButtonsText", typeof(String), typeof(UC_GreenButton), null); public String GreenButtonsText { get { return (String)GetValue(GreenButtonsTextProperty); } set { SetValue(GreenButtonsTextProperty, value); } } #endregion GreenButtonsTextProperty DP
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