此示例演示如何指定 FillBehavior 动画属性的非活动 Timeline 状态。
示例:
Timeline 的 FillBehavior 属性确定一个动画属性在没有进行动画时的处理方式,也就是说,当 Timeline 处于非活动状态时,它的父级 Timeline 仍处于活动或保持期内。 例如,动画属性在动画结束时是否保留在其结束值,或者它是否还原回动画开始前的值?
以下示例使用一个 DoubleAnimation 对两个矩形进行 Width 动画处理。 每个矩形使用不同的 Timeline 对象。
Timeline 有一个 FillBehavior 被设置为 Stop,这会导致矩形的宽度在 Timeline 结束时恢复到其非动画值。 另一个Timeline有一个FillBehaviorHoldEnd,导致宽度在Timeline结束时保持不变,停留在其最终值。
<Page
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" >
<StackPanel Margin="20">
<Border Background="#99FFFFFF">
<TextBlock Margin="20">
This example shows how the FillBehavior property determines how an animation behaves
after it reaches the end of its duration.
</TextBlock>
</Border>
<TextBlock>FillBehavior="Deactivate"</TextBlock>
<Rectangle Name="deactiveAnimationRectangle" Width="20" Height="20" Fill="#AA3333FF" HorizontalAlignment="Left" >
<Rectangle.Triggers>
<EventTrigger RoutedEvent="Rectangle.Loaded">
<BeginStoryboard>
<Storyboard>
<!-- The animated rectangle's width reverts back to its non-animated value
after the animation ends. -->
<DoubleAnimation
Storyboard.TargetName="deactiveAnimationRectangle"
Storyboard.TargetProperty="Width"
From="100" To="400" Duration="0:0:2" FillBehavior="Stop" />
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</Rectangle.Triggers>
</Rectangle>
<TextBlock Margin="0,20,0,0">FillBehavior="HoldEnd" </TextBlock>
<Rectangle Name="holdEndAnimationRectangle" Width="20" Height="20" Fill="#AA3333FF" HorizontalAlignment="Left" >
<Rectangle.Triggers>
<EventTrigger RoutedEvent="Rectangle.Loaded">
<BeginStoryboard>
<Storyboard>
<!-- The animated rectangle's width remains at its end value after the
animation ends. -->
<DoubleAnimation Storyboard.TargetName="holdEndAnimationRectangle"
Storyboard.TargetProperty="Width"
From="100" To="400" Duration="0:0:2" FillBehavior="HoldEnd" />
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</Rectangle.Triggers>
</Rectangle>
</StackPanel>
</Page>
有关完整示例,请参阅 动画示例库。