Programming .NET Silverlight Applications in .NET

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Programming .NET Silverlight Applications
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LISTING 8.17
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C# Code-Behind File That Implements Event Handlers to Handle User Input
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using using using using System; System.Windows; System.Windows.Controls; System.Windows.Input;
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namespace proj0808 { public partial class Page : UserControl { public Page() { InitializeComponent(); //Initialize Date and State Selection Handlers myCalendar.SelectedDatesChanged += new EventHandler< SelectionChangedEventArgs>(dateSelected); myStateList.SelectionChanged += new SelectionChangedEventHandler(stateSelected); } void stateSelected(object sender, SelectionChangedEventArgs e) { var state = e.AddedItems[0] as TextBlock; txtState.Text = state.Text; } void dateSelected(object sender, SelectionChangedEventArgs e) { txtDate.Text = String.Format( {0:D} , myCalendar.SelectedDate); } private void placeClick(object sender, RoutedEventArgs e) { var btnPlace = sender as RadioButton; txtPlace.Text = btnPlace.Content.ToString(); btnPlace.IsChecked = false; } } }
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Part III
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Programming Silverlight Applications
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The XAML code in Listing 8.16 defines a Web form by implementing a series of TextBox and TextBlock elements. The data to fill in the TextBlock controls are set using a set of Calendar, ListBox, and RadioButton controls also defined in Listing 8.16. The C# code in Listing 8.17 gathers data from the Calendar control named myCalendar and the ListBox control name myStateList by attaching the dateSelected() and stateSelected() event handlers using the following code:
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myCalendar.SelectedDatesChanged+= new EventHandler<SelectionChangedEventArgs>(dateSelected); myStateList.SelectionChanged += new SelectionChangedEventHandler(stateSelected);
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Inside the SelectedDateChanged event handler dateSelected(), the handler sets the Text property of the txtDate object using the date from the SelectedDate property of the myCalendar Calendar control.
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txtDate.Text = String.Format( {0:D} , myCalendar.SelectedDate);
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The stateSelected() event handler in Listing 8.17 casts the first element in the AddedItems property of the event argument e to a TextBlock object named state. The Text attribute of txtState can then be set as shown in the following code:
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var state = e.AddedItems[0] as TextBlock; txtState.Text = state.Text;
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The event handlers for the radio buttons are handled a bit differently. The placeClick() event handler is added to the RadioButton controls in the XAML file in Listing 8.16. Then inside the event handler, the event argument e is cast as a RadioButton and the Text attribute of the txtPlace object is set to the value of the Content attribute of the RadioButton that triggered the event.
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var btnPlace = sender as RadioButton; txtPlace.Text = btnPlace.Content.ToString();
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The Silverlight form application defined in Listings 8.16 and 8.17 allows a user to use TextBox, Calendar, ListBox, and RadioButton controls to add data to the form, as shown in Figure 8.9.
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Programming .NET Silverlight Applications
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FIGURE 8.9 Simple Silverlight form application that implements TextBox, Calendar, ListBox, and RadioButton controls
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Controlling Animations Programmatically
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One of the most dramatic features that Silverlight provides to create rich Internet content is the ability to create and control animations. As you learned in 3, you can use Storyboard and DoubleAnimation elements in XAML to animate Silverlight controls. The following sections discuss how to start and stop animations and how to dynamically create animations of objects in code-behind pages.
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Starting and stopping the animation
When an animation is started, Silverlight begins rendering the animation as a sequence of frames to the browser based on the duration set in the animation. What is animated is defined by any DoubleAnimation or DoubleAnimationWithKeyFrame children that belong to the Storyboard. Starting and stopping animations is handled through the Begin() and Stop() functions of a Storyboard object. For example, if you define a Storyboard with the name myAnimation, then the following lines of C# code start the animation:
myAnimation.Begin();
Part III
Programming Silverlight Applications
To stop a Storyboard named myAnimation that is already rendering, you can use the following line of code:
myAnimation.Stop;
One of the most common uses of animations is to provide added style to buttons or links when the mouse is over them. The code in Listing 8.18 and 8.19 illustrates two examples of using XAML code to define animations and then using mouse event handlers in the code-behind page to start and stop the animation.
LISTING 8.18
XAML File That Defines a Two-Button Control with Storyboard Animations That Animate the Resize and Opacity Change of a Silverlight Control
<UserControl x:Class= proj0809.Page xmlns= http://schemas.microsoft.com/client/2007 xmlns:x= http://schemas.microsoft.com/winfx/2006/xaml Width= 400 Height= 300 > <UserControl.Resources> <Storyboard x:Name= FadeIt > <DoubleAnimation Storyboard.TargetName= btnFade Storyboard.TargetProperty= (UIElement.Opacity) From= .25 To= 1 Duration= 00:00:01 /> </Storyboard> <Storyboard x:Name= SizeIt > <DoubleAnimation Storyboard.TargetName= btnSize Storyboard.TargetProperty= (UIElement.RenderTransform). (TransformGroup.Children)[0].(ScaleTransform.ScaleX) From= 1 To= 2 Duration= 00:00:01 /> <DoubleAnimation Storyboard.TargetName= btnSize Storyboard.TargetProperty= (UIElement.RenderTransform). (TransformGroup.Children)[0].(ScaleTransform.ScaleY) From= 1 To= 2 Duration= 00:00:01 /> </Storyboard> </UserControl.Resources> <Grid x:Name= LayoutRoot Background= Black > <Button x:Name= btnSize Content= Resize Height= 50 Width= 150 Margin= 100,41,0,0 HorizontalAlignment= Left VerticalAlignment= Top RenderTransformOrigin= 0.5,0.5 > <Button.RenderTransform> <TransformGroup> <ScaleTransform/>