How to: Use Event Triggers to Control a Storyboard After It Starts
This example shows how to control a Storyboard after it starts. To start a Storyboard by using XAML, use BeginStoryboard, which distributes the animations to the objects and properties they animate and then starts the storyboard. If you give BeginStoryboard a name by specifying its Name property, you make it a controllable storyboard. You can then interactively control the storyboard after it starts.
Use the following storyboard actions together with EventTrigger objects to control a storyboard.
PauseStoryboard: Pauses the storyboard.
ResumeStoryboard: Resumes a paused storyboard.
SetStoryboardSpeedRatio: Changes the storyboard speed.
SkipStoryboardToFill: Advances a storyboard to the end of its fill period, if it has one.
StopStoryboard: Stops the storyboard.
RemoveStoryboard: Removes the storyboard, freeing resources.
Example
The following example uses controllable storyboard actions to interactively control a storyboard.
Note: To see an example of controlling a storyboard by using code, see How to: Control a Storyboard After It Starts.
<Page xmlns="https://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="https://schemas.microsoft.com/winfx/2006/xaml"
WindowTitle="Controlling a Storyboard" >
<StackPanel Margin="20" >
<!-- This rectangle is animated. -->
<Rectangle Name="myRectangle"
Width="100" Height="20" Margin="12,0,0,5" Fill="#AA3333FF" HorizontalAlignment="Left" />
<!-- This StackPanel contains all the Buttons. -->
<StackPanel Orientation="Horizontal" Margin="0,30,0,0">
<Button Name="BeginButton">Begin</Button>
<Button Name="PauseButton">Pause</Button>
<Button Name="ResumeButton">Resume</Button>
<Button Name="SeekButton">Seek</Button>
<Button Name="SkipToFillButton">Skip To Fill</Button>
<Button Name="SetSpeedRatioButton">Triple Speed</Button>
<Button Name="StopButton">Stop</Button>
<StackPanel.Triggers>
<!-- Begin the Storyboard -->
<EventTrigger RoutedEvent="Button.Click" SourceName="BeginButton">
<BeginStoryboard Name="MyBeginStoryboard">
<Storyboard >
<DoubleAnimation
Storyboard.TargetName="myRectangle"
Storyboard.TargetProperty="Width"
Duration="0:0:5" From="100" To="500" />
</Storyboard>
</BeginStoryboard>
</EventTrigger>
<!-- Pause the Storyboard -->
<EventTrigger RoutedEvent="Button.Click" SourceName="PauseButton">
<PauseStoryboard BeginStoryboardName="MyBeginStoryboard" />
</EventTrigger>
<!-- Resume the Storyboard -->
<EventTrigger RoutedEvent="Button.Click" SourceName="ResumeButton">
<ResumeStoryboard BeginStoryboardName="MyBeginStoryboard" />
</EventTrigger>
<!-- Seek one second into the storyboard's active period. -->
<EventTrigger RoutedEvent="Button.Click" SourceName="SeekButton">
<SeekStoryboard
BeginStoryboardName="MyBeginStoryboard"
Offset="0:0:1" Origin="BeginTime" />
</EventTrigger>
<!-- Skip to Fill -->
<EventTrigger RoutedEvent="Button.Click" SourceName="SkipToFillButton">
<SkipStoryboardToFill BeginStoryboardName="MyBeginStoryboard" />
</EventTrigger>
<!-- Stop the Storyboard -->
<EventTrigger RoutedEvent="Button.Click" SourceName="StopButton">
<StopStoryboard BeginStoryboardName="MyBeginStoryboard" />
</EventTrigger>
<!-- Triple the speed of the Storyboard -->
<EventTrigger RoutedEvent="Button.Click" SourceName="SetSpeedRatioButton">
<SetStoryboardSpeedRatio SpeedRatio="3" BeginStoryboardName="MyBeginStoryboard" />
</EventTrigger>
</StackPanel.Triggers>
</StackPanel>
</StackPanel>
</Page>
For additional examples, see the Animation Example Gallery.
See Also
Tasks
How to: Control a Storyboard After It Starts