Programming .NET Silverlight Applications in .NET

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Programming .NET Silverlight Applications
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<SkewTransform/> <RotateTransform/> <TranslateTransform/> </TransformGroup> </Button.RenderTransform> </Button> <Button x:Name= btnFade Content= Fade In Height= 50 Width= 150 Margin= 100,120,0,0 HorizontalAlignment= Left VerticalAlignment= Top Opacity= 0.25 /> </Grid> </UserControl>
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LISTING 8.19
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C# Code-Behind File That Uses Mouse Event Handlers to Start and Stop Button Animation
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using using using using using using System; System.Windows; System.Windows.Controls; System.Windows.Input; System.Windows.Media; System.Windows.Media.Animation;
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namespace proj0809 { public partial class Page : UserControl { public Page() { InitializeComponent(); //Initialize mouse enter events to begin animation btnFade.MouseEnter += new MouseEventHandler(btnFade_MouseEnter); btnSize.MouseEnter += new MouseEventHandler(btnSize_MouseEnter); //Initialize mouse leave events to stop animation btnFade.MouseLeave += new MouseEventHandler(btnFade_MouseLeave); btnSize.MouseLeave += new MouseEventHandler(btnSize_MouseLeave); } void btnSize_MouseEnter(object sender, MouseEventArgs e)
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continued
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Part III
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Programming Silverlight Applications
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LISTING 8.19 {
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SizeIt.Begin(); } void btnFade_MouseEnter(object sender, MouseEventArgs e) { FadeIt.Begin(); } void btnSize_MouseLeave(object sender, MouseEventArgs e) { SizeIt.Stop(); } void btnFade_MouseLeave(object sender, MouseEventArgs e) { FadeIt.Stop(); } } }
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The code in Listing 8.18 defines two Button controls and two Storyboard elements, one for each button. For the Button named btnSize, a Storyboard named SizeIt is defined that implements two DoubleAnimation children to perform scale transforms along the X and Y axis. For the Button named btnFade, a Storyboard named FadeIt is defined that implements a single DoubleAnimation that animates the Opacity attribute of the Button object from .25 to 1. The animations defined in Listing 8.18 are implemented in Listing 8.19 by adding a MouseEnter and MouseExit event handler to each button. To animate the button when the user moves the mouse over it, the code in Listing 8.19 starts the animation in the MouseEnter event handlers using the following lines of code:
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SizeIt.Begin(); . . . FadeIt.Begin();
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To stop the animation and return the object to a preanimated state when the mouse leaves the button, the code stops the animation in the MouseExit event handlers using the following lines of code:
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SizeIt.Stop(); . . . FadeIt.Stop();
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The Silverlight application defined in Listings 8.18 and 8.19 displays two buttons; when the mouse is navigated over the top button the button resizes, when the mouse is moved over the bottom button the button fades in, as shown in Figure 8.10.
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Programming .NET Silverlight Applications
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FIGURE 8.10 Simple Silverlight form application that implements two animated buttons
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Handling the animation completed event
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The Storyboard object provides the Completed event, similar to the Completed event that is provided by the MediaElement control. When the Storyboard is completely rendered, the Completed event is triggered. The Completed event is very useful when you need to do cleanup work after an event or if you want to run multiple animations in a sequence. For example, consider two Storyboard objects named animateFirst and animateSecond. If you want to run the animations in a sequence one after another, use the following code to add a Completed event handler to the first Storyboard:
animateFirst.Completed += new EventHandler(firstCompleted);
Inside the firstCompleted event handler, you would then start the second animation using the following code:
void firstCompleted(object sender, EventArgs e) { animateSecond.Start(); }
Dynamically creating animations in code
Defining animations in XAML works well for most button animations; however, there are times that you want to dynamically create animations in your .NET code. This allows you to reuse the same animation for multiple objects easily and gives you much more flexibility in defining the behavior of the animation. Creating an animation programmatically uses much of the same logic as creating one in XAML. You create a Storyboard object and then add to it DoubleAnimation or DoubleAnimationWithKeyFrame objects that render the animation.
When adding animations programmatically, write a function that creates a TransformGroup that can be added to the object being animated.
Part III
Programming Silverlight Applications
The code in Listings 8.20 and 8.21 shows an example of creating animations in .NET code dynamically and adding them to Image objects that are defined in XAML.
LISTING 8.20
XAML File That Defines Six Image Controls That Are Animated in the Code-Behind File
<UserControl x:Class= Proj0810.Page xmlns= http://schemas.microsoft.com/client/2007 xmlns:x= http://schemas.microsoft.com/winfx/2006/xaml Width= 400 Height= 300 > <Grid x:Name= LayoutRoot Background= Black > <Image x:Name= image1 Source= /test.jpg MouseEnter= imageMouseEnter Height= 100 Width= 100 VerticalAlignment= Top HorizontalAlignment= Left Margin= 40,40,0,0 /> <Image x:Name= image2 Source= /test.jpg MouseEnter= imageMouseEnter Height= 100 Width= 100 VerticalAlignment= Top HorizontalAlignment= Left Margin= 140,40,0,0 /> <Image x:Name= image3 Source= /test.jpg MouseEnter= imageMouseEnter Height= 100 Width= 100 VerticalAlignment= Top HorizontalAlignment= Left Margin= 240,40,0,0 /> <Image x:Name= image4 Source= /test.jpg MouseEnter= imageMouseEnter Height= 100 Width= 100 VerticalAlignment= Top HorizontalAlignment= Left Margin= 40,120,0,0 /> <Image x:Name= image5 Source= /test.jpg MouseEnter= imageMouseEnter Height= 100 Width= 100 VerticalAlignment= Top HorizontalAlignment= Left Margin= 140,120,0,0 /> <Image x:Name= image6 Source= /test.jpg MouseEnter= imageMouseEnter Height= 100 Width= 100 VerticalAlignment= Top HorizontalAlignment= Left Margin= 240,120,0,0 /> </Grid> </UserControl>