Part III in .NET

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Part III
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Programming Silverlight Applications
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Dynamically deleting XAML elements
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Using code-behind pages, you can also dynamically remove XAML elements from an object. This is done by accessing the Children attribute of an XAML element that contains child elements. You can use the Remove method of the Children object to remove child objects from an existing object. For example, consider the following code that exposes a Canvas object using the name myCanvas, the canvas contains a child TextBlock object name txtBlock:
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<Canvas x:Name= myCanvas > <TextBlock x:Name= txtBlock Text= MssEd UP Txt! /> </Canvas>
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You could use the following C# code to remove the TextBlock element from the Canvas:
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myCanvas.Children.Remove(txtBlock);
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Using the Children.Remove() method, you can remove any object that is a UIElement and a child of the current object. To illustrate this further, consider the code in Listing 8.5.
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LISTING 8.5
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C# Code-Behind File That Adds an Event Handler to a Grid Element and Dynamically Adds Rectangle Objects with Event Handlers That Handle the Removal of the Object
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using using using using using using using System; System.Windows; System.Windows.Controls; System.Windows.Input; System.Windows.Media; System.Windows.Media.Animation; System.Windows.Shapes;
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namespace proj0802 { public partial class Page : UserControl { public Page() { InitializeComponent();
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playArea.MouseLeftButtonUp += new MouseButtonEventHandler(playArea_Add); } void playArea_Add(object sender, MouseButtonEventArgs e) { Point location = e.GetPosition(null); Rectangle aBlock = new Rectangle(); aBlock.Height = 40; aBlock.Width = 40; aBlock.StrokeThickness = 3; aBlock.Stroke = new SolidColorBrush(Colors.Blue); aBlock.Fill = new SolidColorBrush(Colors.Red); aBlock.HorizontalAlignment = HorizontalAlignment.Left; aBlock.VerticalAlignment = VerticalAlignment.Top; aBlock.Margin = new Thickness(location.X, location.Y, 0, 0); aBlock.MouseLeftButtonUp += new MouseButtonEventHandler(blockDelete); LayoutRoot.Children.Add(aBlock); } void blockDelete(object sender, MouseButtonEventArgs e) { Rectangle block = sender as Rectangle; LayoutRoot.Children.Remove(block); } } }
Listing 8.5 adds some additional functionality to that of Listing 8.4. Now when a Rectangle is created, a MouseLeftButtonUp event handler is added before adding it to the root canvas. Inside that event handler, we retrieve the sender as a Rectangle object and then implement the Children.Remove() method to remove the Rectangle that was clicked from the root canvas. Figure 8.3 shows the results of clicking on Rectangle objects in the Web browser. Inside the event handler for the Rectangle objects in Listing 8.5, the Rectangle is removed from the rendered XAML when you click it with the mouse.
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Part III
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Programming Silverlight Applications
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FIGURE 8.3 Silverlight application that removes the added rectangle objects from the rendered XAML each time they are clicked by the mouse
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Implementing Event Handling
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One of the strengths of Silverlight is how easy it is to implement event handling in applications. Event handling is accomplished by attaching a specific event handler to an object. In Silverlight, this can be done either in the XAML code or in the managed code-behind file. In XAML, an event handler can be attached to an object by setting the event attribute to the name of the handler function in the code-behind page. For example, the following code attached the MouseEnterHandler() function to the MouseEnter attribute of a TextBlock element:
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<TextBlock MouseEnter= MouseEnterHandler />
To attach an event handler in the code-behind page, you need to create a new event handler object and add it to the event handler attribute of the Silverlight control. For example, the following code attached the myText_MouseLeave() function to the MouseLeave attribute of a TextBlock control named myText:
myText.MouseLeave += new MouseEventHandler(myText_MouseLeave);
Listings 8.6 and 8.7 show the full implementation of the MouseEnter and MouseLeave events in the XAML and C# code-behind files.
LISTING 8.6
XAML File That Attaches a MouseEnter Event Handler to a TextBlock Silverlight Control
<UserControl x:Class= proj0803.Page xmlns= http://schemas.microsoft.com/client/2007
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xmlns:x= http://schemas.microsoft.com/winfx/2006/xaml Width= 400 Height= 300 > <Grid x:Name= LayoutRoot Background= White > <TextBlock x:Name= myText Text= Mouse is Gone MouseEnter= MouseEnterHandler /> </Grid> </UserControl>
LISTING 8.7
C# Code-Behind File That Implements MouseEnter and MouseLeave Event Handlers
using using using using System; System.Windows; System.Windows.Controls; System.Windows.Input;
namespace proj0803 { public partial class Page : UserControl { public Page() { InitializeComponent(); myText.MouseLeave += new MouseEventHandler(myText_MouseLeave); } private void MouseEnterHandler(object sender, MouseEventArgs e) { var txtBlock = sender as TextBlock; txtBlock.Text = Mouse at + e.GetPosition(LayoutRoot).ToString(); txtBlock.FontSize = 20; } void myText_MouseLeave(object sender, MouseEventArgs e) { myText.Text = Mouse is Gone ; myText.FontSize = 10; } } }