how to generate barcode in c# web application Complex property paths in XAML Storyboards in Visual Basic .NET

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Listing 22.5 Complex property paths in XAML Storyboards
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<Storyboard x:Name="myStoryboard" Storyboard.TargetName="myRectangle"> <ColorAnimation Storyboard.TargetProperty="(Shape.Fill). (GradientBrush.GradientStops)[1].(GradientStop.Color)" To="#FFBB0000" /> <ColorAnimation Storyboard.TargetProperty="(Shape.Fill). (GradientBrush.GradientStops)[3].(GradientStop.Color)" To="#FFBB0000" /> </Storyboard>
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Animation and behaviors
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<Rectangle x:Name="myRectangle" Width="120" Height="60" > <Rectangle.Fill> <LinearGradientBrush EndPoint="1,0.5" StartPoint="0,0.5"> <GradientStop Color="#FFDA0000" Offset="0"/> <GradientStop Color="#FFA500BB" Offset="0.25"/> <GradientStop Color="#FF000000" Offset="0.5"/> <GradientStop Color="#FFA500BB" Offset="0.75"/> <GradientStop Color="#FFDA0000" Offset="1"/> </LinearGradientBrush> </Rectangle.Fill> </Rectangle>
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Index 1 Index 3
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This listing shows how to use the property path syntax to access the individual colors used within the LinearGradientBrush. An index of 1 is used within B to reference the second GradientStop in the brush. At the same time, an index of 3 C is used to change the color of the fourth GradientStop. In addition to the indexing syntax, it s important to recognize the use of the parentheses around each property. Parentheses are used in the property path syntax to group a property with an element. As shown in listing 22.5, you can t begin by drilling into a property; instead, you begin with an element type. From there, you specify the name of the property you want to animate and continue by delimiting with a period. This syntax is depicted in figure 22.4.
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The property path syntax in action
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This figure shows the general syntax used for referencing properties using this property path syntax. This approach makes it easy to access items that haven t been explicitly named. This syntax enables you to readily take control of the properties within an element. Equally important is the way that Silverlight enables you to take control of the Storyboard itself.
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22.3.3 Controlling the Storyboard
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The Storyboard class exposes a number of valuable methods that enable you to programmatically control an animation. These methods, shown in table 22.3, reflect many of the features you ve already seen within the MediaElement.
Table 22.3 Methods associated with the Storyboard object Description Turns the hourglass to start pouring the sands of time. This method starts the animations that are the Children of the Storyboard. Halts the playback of the animations associated with a Storyboard and preserves the current position.
Method
Begin(...) Pause(...)
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Storyboarding
Table 22.3 Methods associated with the Storyboard object (continued) Description Continues the animations associated with a Storyboard from a previous position. Skips to a new position within a Storyboard. The position is represented as a TimeSpan value. Halts the playback of the animations associated with a Storyboard and resets the playback position to the beginning of the Storyboard.
Method
Resume(...) Seek(...) Stop(...)
The methods described in this table enable you to programmatically interact with a Storyboard. In doing so, you can easily deliver a dynamic animation experience. This experience may involve leaping forward to a later part in an animation or giving the user control via interactive playback features. Either way, an important part of interacting with an animation involves knowing when it s finished. Thankfully, the Storyboard exposes the Completed event. The Completed event is the only event exposed by the Storyboard element. In reality, this event is part of the Timeline. Regardless, the Completed event is triggered when the assigning Storyboard has finished. A Storyboard is deemed finished once all its child Timeline elements have completed. Listing 22.6 shows a MediaElement performing one complete rotation when a user clicks it. Once this animation has completed, it ll use another animation to fade the MediaElement out of view.
Listing 22.6 Using the Playback methods and Completed event XAML:
<MediaElement x:Name="media" Source="http://www.silverlightinaction.com/video2.wmv" AutoPlay="True" MouseLeftButtonUp="media_MouseLeftButtonUp" RenderTransformOrigin="0.5,0.5"> <MediaElement.Resources> <Storyboard x:Name="myStoryboard1" Completed="myStoryboard1_Completed"> <DoubleAnimation Storyboard.TargetName="media" Storyboard.TargetProperty="(UIElement.RenderTransform). (TransformGroup.Children)[0].(RotateTransform.Angle)" From="0" To="360" Duration="00:00:02" /> </Storyboard> <Storyboard x:Name="myStoryboard2"> <DoubleAnimation Storyboard.TargetName="media" Storyboard.TargetProperty="Opacity" From="1" To="0" Duration="00:00:02" /> </Storyboard> </MediaElement.Resources> <MediaElement.RenderTransform>
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Animation and behaviors
<TransformGroup> <RotateTransform Angle="0"/> </TransformGroup> </MediaElement.RenderTransform> </MediaElement>
void media_MouseLeftButtonUp(object sender, MouseButtonEventArgs e) { myStoryboard1.Begin(); } void myStoryboard1_Completed(object sender, EventArgs e) { myStoryboard2.Begin(); }
This listing shows how you can programmatically use the Completed event as well as one of the interactive playback methods. When the user clicks the MediaElement, the Storyboard defined as myStoryboard1 will begin playing. Once this Storyboard has finished playing, the Completed event associated with it will be triggered. This event handler will then start the animation defined in myStoryboard2. This example also shows how you can define an animation as a resource. This is one of the two ways that you can use an animation on the road to being resourceful.
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