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return (bool)base.GetValue(IsFlippedProperty); } set { base.SetValue(IsFlippedProperty, value); ChangeVisualState(true); } } The IsFlipped property setter calls a custom method called ChangeVisualState(). This method makes sure the display is updated to match the current flip state (forward-facing or backward-facing). You ll consider the code that takes care of this task a bit later. The FlipPanel doesn t need many more properties, because it inherits virtually everything it needs from the Control class. One exception is the CornerRadius property. Although the Control class includes BorderBrush and BorderThickness properties, which you can use to draw a border around the FlipPanel, it lacks the CornerRadius property for rounding square edges into a gentler curve, as the Border element does. Implementing the same effect in the FlipPanel is easy, provided you add the CornerRadius dependency property and use it to configure a Border element in the FlipPanel s default control template: public static readonly DependencyProperty CornerRadiusProperty = DependencyProperty.Register("CornerRadius", typeof(CornerRadius), typeof(FlipPanel), null); public CornerRadius CornerRadius { get { return (CornerRadius)GetValue(CornerRadiusProperty); } set { SetValue(CornerRadiusProperty, value); } } You also need to add a style that applies the default template for the FlipPanel. You place this style in the generic.xaml resource dictionary, as you did when developing the ColorPicker. Here s the basic skeleton you need: <Style TargetType="{x:Type local:FlipPanel}"> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="local:FlipPanel"> ... </ControlTemplate> </Setter.Value> </Setter> </Style> There s one last detail. To tell your control to pick up the default style from the generic.xaml file, you need to call the DefaultStyleKeyProperty.OverrideMetadata() method in the FlipPanel s static constructor: DefaultStyleKeyProperty.OverrideMetadata(typeof(FlipPanel), new FrameworkPropertyMetadata(typeof(FlipPanel)));

So far, all the attributes you ve seen map to properties. However, attributes can also be used to attach event handlers. The syntax for this is EventName="EventHandlerMethodName". For example, the Button control provides a Click event. You can attach an event handler like this: <Button ... Click="cmdAnswer_Click"> This assumes that there is a method with the name cmdAnswer_Click in the code-behind class. The event handler must have the correct signature (that is, it must match the delegate for the Click event). Here s the method that does the trick: private void cmdAnswer_Click(object sender, RoutedEventArgs e) { this.Cursor = Cursors.Wait; // Dramatic delay... System.Threading.Thread.Sleep(TimeSpan.FromSeconds(3)); AnswerGenerator generator = new AnswerGenerator(); txtAnswer.Text = generator.GetRandomAnswer(txtQuestion.Text); this.Cursor = null; } As you may have noticed from the signature of this event handler, the event model in WPF is different than in earlier versions of .NET. It supports a new model that relies on event routing. You ll learn more in 5. In many situations, you ll use attributes to set properties and attach event handlers on the same element. WPF always follows the same sequence: first it sets the Name property (if set), then it attaches any event handlers, and lastly it sets the properties. This means that any event handlers that respond to property changes will fire when the property is set for the first time.

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While the model provides the means to solve the software problem at hand, the view makes this code usable by anyone without requiring the coding knowledge to use the model. It is required to perform two main roles: represent the data that the model provides and accept input from the user before handing it to the model. It is important that the view does only these two things, never ceding to temptation by adding business or domain logic.

Note It s possible to embed code (such as event handlers) directly in a XAML document using the Code

writer.WriteLine("<table>"); writer.Write("<tr>"); writer.Write("<td>Website</td>"); writer.Write("<td><a href=\"http://" + senatorDetail.Website + "\">http://" + senatorDetail.Website + "</a></td>"); writer.WriteLine("</tr>"); writer.Write("<tr>"); writer.Write("<td>Address</td><td></td>"); writer.Write("</tr>"); writer.Write("<tr>"); writer.Write("<td><td>" + senatorDetail.Address + "<br/>"); writer.Write(senatorDetail.CityState + "<br/>"); writer.Write("</td>"); writer.WriteLine("</tr>"); writer.Write("<tr>"); writer.Write("<td>Phone</td>"); writer.Write("<td>" + senatorDetail.Phone + "</td>"); writer.WriteLine("</tr>"); writer.WriteLine("</table>"); writer.WriteLine("</td>"); } writer.WriteLine("</tr>"); writer.WriteLine("</table>"); } 8. Add the RenderCountyAndCityInfo method using the following code. This method calls both the CountyWebSites service and the CityWebSites service and then renders the results in a panel. Because not every city and county has a website; the code also checks to see whether a website was returned. If no website was returned, the control will not be displayed. public void RenderCountyAndCityInfo(HtmlTextWriter writer, System.Web.UI.Control control) { CountyWebsites.SDPUSCountyWebSites countyService = new CountyWebsites.SDPUSCountyWebSites(); CountyWebsites.RegisteredUser countyUser = new CountyWebsites.RegisteredUser(); countyUser.UserID = userID; countyUser.Password = password; CountyWebsites.LicenseInfo countyLicenseInfo =

element. However, this technique is thoroughly discouraged, and it doesn t have any practical application in WPF. This approach isn t supported by Visual Studio, and it isn t discussed in this book.

Visual Studio helps you out with IntelliSense when you add an event handler attribute. Once you enter the equals sign (for example, after you ve typed Click= in the <Button> element), it shows a dropdown list with all the suitable event handlers in your code-behind class, as shown in Figure 2-2. If you need to create a new event handler to handle this event, you simply need to choose <New Event Handler> from the top of the list. Alternatively, you can attach and create event handlers using the Events tab of the Properties window.

Now that you ve considered the fundamentals of XAML, you know enough to walk through the definition for the window in Figure 2-1. Here s the complete XAML markup: <Window x:Class="EightBall.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="Eight Ball Answer" Height="328" Width="412" > <Grid Name="grid1"> <Grid.RowDefinitions> <RowDefinition Height="*" /> <RowDefinition Height="Auto" /> <RowDefinition Height="*" /> </Grid.RowDefinitions> <TextBox VerticalAlignment="Stretch" HorizontalAlignment="Stretch" Margin="10,10,13,10" Name="txtQuestion" TextWrapping="Wrap" FontFamily="Verdana" FontSize="24" Grid.Row="0"> [Place question here.] </TextBox> <Button VerticalAlignment="Top" HorizontalAlignment="Left" Margin="10,0,0,20" Width="127" Height="23" Name="cmdAnswer" Click="cmdAnswer_Click" Grid.Row="1"> Ask the Eight Ball </Button> <TextBox VerticalAlignment="Stretch" HorizontalAlignment="Stretch" Margin="10,10,13,10" Name="txtAnswer" TextWrapping="Wrap" IsReadOnly="True" FontFamily="Verdana" FontSize="24" Foreground="Green" Grid.Row="2">

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