此示例演示如何指定动画分镜之间的交接行为。 该 HandoffBehavior 属性 BeginStoryboard 指定新动画如何与已应用于属性的任何现有动画进行交互。
示例：
以下示例创建两个按钮，当鼠标光标移动到它们上方时放大，当光标移开时会变小。 如果鼠标悬停在按钮上，然后快速删除光标，则在完成第一个动画之前，将应用第二个动画。 当两个动画像这样重叠时，您可以看到HandoffBehavior值在Compose和SnapshotAndReplace之间的差异。 一个值 Compose 将重叠动画组合在一起，从而在动画之间产生更流畅的切换，而新动画的值 SnapshotAndReplace 会立即替换先前的重叠动画。
<Page
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<Page.Resources>
<!-- This Style specifies mouseover and mouseout behaviors. The button gets larger when
the cursor moves over it and smaller when the cursor moves away. Note that the same Properties
(ScaleX and ScaleY) are being targeted by both animations. The BeginStoryboard for each animation
uses a HandoffBehavior of "Compose" which causes the old animation to interpolate more gradually into
the new one. -->
<Style x:Key="ButtonWithCompose" TargetType="{x:Type Button}">
<Setter Property="Button.RenderTransform">
<Setter.Value>
<ScaleTransform CenterX="50" CenterY="50" ScaleX="1" ScaleY="1" />
</Setter.Value>
</Setter>
<Style.Triggers>
<EventTrigger RoutedEvent="Mouse.MouseEnter">
<EventTrigger.Actions>
<BeginStoryboard >
<Storyboard>
<DoubleAnimation Duration="0:0:2" Storyboard.TargetProperty="RenderTransform.ScaleX" To="3" />
<DoubleAnimation Duration="0:0:2" Storyboard.TargetProperty="RenderTransform.ScaleY" To="3" />
</Storyboard>
</BeginStoryboard>
</EventTrigger.Actions>
</EventTrigger>
<EventTrigger RoutedEvent="Mouse.MouseLeave">
<EventTrigger.Actions>
<BeginStoryboard HandoffBehavior="Compose">
<Storyboard>
<DoubleAnimation Duration="0:0:2" Storyboard.TargetProperty="RenderTransform.ScaleX" />
<DoubleAnimation Duration="0:0:2" Storyboard.TargetProperty="RenderTransform.ScaleY" />
</Storyboard>
</BeginStoryboard>
</EventTrigger.Actions>
</EventTrigger>
</Style.Triggers>
</Style>
<!-- For this button style, BeginStoryboard uses the default HandoffBehavior of "SnapShotAndReplace" -->
<Style x:Key="ButtonWithSnapShotAndReplace" TargetType="{x:Type Button}">
<Setter Property="Button.RenderTransform">
<Setter.Value>
<ScaleTransform CenterX="50" CenterY="50" ScaleX="1" ScaleY="1" />
</Setter.Value>
</Setter>
<Style.Triggers>
<EventTrigger RoutedEvent="Mouse.MouseEnter">
<EventTrigger.Actions>
<BeginStoryboard >
<Storyboard>
<DoubleAnimation Duration="0:0:2" Storyboard.TargetProperty="RenderTransform.ScaleX" To="3" />
<DoubleAnimation Duration="0:0:2" Storyboard.TargetProperty="RenderTransform.ScaleY" To="3" />
</Storyboard>
</BeginStoryboard>
</EventTrigger.Actions>
</EventTrigger>
<EventTrigger RoutedEvent="Mouse.MouseLeave">
<EventTrigger.Actions>
<BeginStoryboard>
<Storyboard>
<DoubleAnimation Duration="0:0:2" Storyboard.TargetProperty="RenderTransform.ScaleX" />
<DoubleAnimation Duration="0:0:2" Storyboard.TargetProperty="RenderTransform.ScaleY" />
</Storyboard>
</BeginStoryboard>
</EventTrigger.Actions>
</EventTrigger>
</Style.Triggers>
</Style>
</Page.Resources>
<Canvas>
<Button Style="{StaticResource ButtonWithSnapShotAndReplace}" Canvas.Top="200" Canvas.Left="200" Width="100" Height="100">
SnapShotAndReplace
</Button>
<Button Style="{StaticResource ButtonWithCompose}" Canvas.Top="200" Canvas.Left="400" Width="100" Height="100">
Compose
</Button>
</Canvas>
</Page>
