Storyboard.TargetProperty Attached Property
Gets or sets the property that should be animated.
Assembly: PresentationFramework (in PresentationFramework.dll)
XMLNS for XAML: http://schemas.microsoft.com/winfx/2006/xaml/presentation, http://schemas.microsoft.com/netfx/2007/xaml/presentation
Metadata properties set to true
The target property must be a dependency property.
The property supports complex syntax that enables you to target properties of other properties. For a detailed description of the different ways to target properties, see Storyboards Overview.
This example shows how to use a Storyboard to animate properties. To animate a property by using a Storyboard, create an animation for each property that you want to animate and also create a Storyboard to contain the animations.
The type of property determines the type of animation to use. For example, to animate a property that takes Double values, use a DoubleAnimation. The TargetName and attached properties specify the object and property to which the animation is applied.
To start a storyboard in Extensible Application Markup Language (XAML), use a BeginStoryboard action and an EventTrigger. The EventTrigger begins the BeginStoryboard action when the event that is specified by its RoutedEvent property occurs. The BeginStoryboard action starts the Storyboard.
The following example uses Storyboard objects to animate two Button controls. To make the first button change in size, its Width is animated. To make the second button change color, the Color property of the SolidColorBrush is used to set the Background of the button that is animated.
<!-- StoryboardExample.xaml Uses storyboards to animate properties. --> <Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" WindowTitle="Animate Properties with Storyboards"> <Border Background="White"> <StackPanel Margin="30" HorizontalAlignment="Left" MinWidth="500"> <TextBlock>Storyboard Animation Example</TextBlock> <!-- The width of this button is animated. --> <Button Name="myWidthAnimatedButton" Height="30" Width="200" HorizontalAlignment="Left"> A Button <Button.Triggers> <!-- Animates the width of the first button from 200 to 300. --> <EventTrigger RoutedEvent="Button.Click"> <BeginStoryboard> <Storyboard> <DoubleAnimation Storyboard.TargetName="myWidthAnimatedButton" Storyboard.TargetProperty="Width" From="200" To="300" Duration="0:0:3" /> </Storyboard> </BeginStoryboard> </EventTrigger> </Button.Triggers> </Button> <!-- The color of the brush used to paint this button is animated. --> <Button Height="30" Width="200" HorizontalAlignment="Left">Another Button <Button.Background> <SolidColorBrush x:Name="myAnimatedBrush" Color="Blue" /> </Button.Background> <Button.Triggers> <!-- Animates the color of the brush used to paint the second button from red to blue . --> <EventTrigger RoutedEvent="Button.Click"> <BeginStoryboard> <Storyboard> <ColorAnimation Storyboard.TargetName="myAnimatedBrush" Storyboard.TargetProperty="Color" From="Red" To="Blue" Duration="0:0:7" /> </Storyboard> </BeginStoryboard> </EventTrigger> </Button.Triggers> </Button> </StackPanel> </Border> </Page>
Although animations can target both a FrameworkElement object, such as a Control or Panel, and a Freezable object, such as a Brush or Transform, only framework elements have a Name property. To assign a name to a freezable so that it can be targeted by an animation, use the x:Name Directive, as the previous example shows.
If you use code, you must create a NameScope for a FrameworkElement and register the names of the objects to animate with that FrameworkElement. To start the animations in code, use a BeginStoryboard action with an EventTrigger. Optionally, you can use an event handler and the Begin method of Storyboard. The following example shows how to use the Begin method.
For more information about animation and storyboards, see Animation Overview.
If you use code, you are not limited to using Storyboard objects in order to animate properties. For more information and examples, see How to: Animate a Property Without Using a Storyboard and How to: Animate a Property by Using an AnimationClock.