我有一个动画,它使用渲染平移变换将边框移动到其宽度。此动画需要应用于多个边框,并且这些边框的宽度将不同。因此,我将动画关键帧的Value
属性绑定到边框的ActualWidth
,以使其滑出。
尝试运行此代码会导致异常,错误信息为:Cannot freeze this Storyboard timeline tree for use across threads.
为关键帧的Value
属性硬编码一个值可以解决此问题,但是动画要么太远,要么不够。
下面是一些示例代码,展示了我想要完成的内容。
<Window
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:WpfApplication1" xmlns:Themes="clr-namespace:Microsoft.Windows.Themes;assembly=PresentationFramework.Aero" x:Class="WpfApplication1.MainWindow"
Title="MainWindow" Height="350" Width="525">
<Grid >
<Button Content="Show Menu" HorizontalAlignment="Left" Margin="270,30,0,0" VerticalAlignment="Top" RenderTransformOrigin="0.5,0.5" Click="Button_Click"/>
<Border x:Name="border" BorderBrush="Black" BorderThickness="1" HorizontalAlignment="Left" Height="100" Margin="260,108,0,0" VerticalAlignment="Top" Width="100" RenderTransformOrigin="0.5,0.5">
<Border.Style>
<Style>
<Style.Resources>
<Storyboard x:Key="SlideOut">
<DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[3].(TranslateTransform.X)" Storyboard.TargetName="border">
<EasingDoubleKeyFrame KeyTime="0:0:0.5" Value="{Binding ActualWidth, ElementName=border}"/>
</DoubleAnimationUsingKeyFrames>
</Storyboard>
<Storyboard x:Key="SlideIn">
<DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[3].(TranslateTransform.X)" Storyboard.TargetName="border">
<EasingDoubleKeyFrame KeyTime="0:0:0.3" Value="0"/>
</DoubleAnimationUsingKeyFrames>
</Storyboard>
</Style.Resources>
<Style.Triggers>
<DataTrigger Binding="{Binding IsMenuOpen}" Value="True">
<DataTrigger.EnterActions>
<BeginStoryboard Storyboard="{StaticResource SlideOut}"/>
</DataTrigger.EnterActions>
<DataTrigger.ExitActions>
<BeginStoryboard Storyboard="{StaticResource SlideIn}"/>
</DataTrigger.ExitActions>
</DataTrigger>
</Style.Triggers>
</Style>
</Border.Style>
<Border.RenderTransform>
<TransformGroup>
<ScaleTransform/>
<SkewTransform/>
<RotateTransform/>
<TranslateTransform/>
</TransformGroup>
</Border.RenderTransform>
<Border.Background>
<LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
<GradientStop Color="Black" Offset="0"/>
<GradientStop Color="White" Offset="1"/>
</LinearGradientBrush>
</Border.Background>
</Border>
</Grid>
</Window>