如何无需后台代码实现WPF动画按钮二次点击反向复位？

我正在用PowerShell搭配WPF做开发，现有示例代码能生成点击后向右移动的动画按钮，现在要找最优方案，实现二次点击时按钮通过反向动画回到初始位置。

初始测试代码（ButtonTest.ps1） #

Add-Type -AssemblyName PresentationFramework, System.Drawing, System.Windows.Forms, WindowsFormsIntegration, presentationCore
[xml]$xaml='
<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" WindowStartupLocation="CenterScreen" WindowStyle="None" Background="Transparent" AllowsTransparency="True" Width="500" Height="300">
    <Window.Resources>
        <ControlTemplate x:Key="NoMouseOverButtonTemplate" TargetType="Button">
            <Border Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}">
                <ContentPresenter HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
            </Border>
            <ControlTemplate.Triggers>
                <Trigger Property="IsEnabled" Value="False">
                    <Setter Property="Background" Value="{x:Static SystemColors.ControlLightBrush}"/>
                    <Setter Property="Foreground" Value="{x:Static SystemColors.GrayTextBrush}"/>
                </Trigger>
            </ControlTemplate.Triggers>
        </ControlTemplate>
    </Window.Resources>
    <Canvas>
        <Button Name="MovableButton" Canvas.Left="70" Canvas.Top="0" FontSize="12" FontFamily="Calibri" FontWeight="Light" BorderBrush="#111111" Foreground="#EEEEEE" Background="#111111" Height="18" Width="70" Template="{StaticResource NoMouseOverButtonTemplate}">ClickMe<Button.Triggers>
            <EventTrigger RoutedEvent="PreviewMouseUp">
                <BeginStoryboard>
                    <Storyboard>
                        <DoubleAnimation Name="ButtonAnimation" From="70" To="207" Duration="0:0:0.25" Storyboard.TargetProperty="(Canvas.Left)" AutoReverse="False"/>
                    </Storyboard>
                </BeginStoryboard></EventTrigger>
            </Button.Triggers>
        </Button>
    </Canvas>
</Window>'
$reader=(New-Object System.Xml.XmlNodeReader $xaml)
$window=[Windows.Markup.XamlReader]::Load($reader)
$Button1=$Window.FindName("MovableButton")
$Button1.Add_Click({
    write-host 按钮被点击
})
$window.Show()
$appContext=New-Object System.Windows.Forms.ApplicationContext
[void][System.Windows.Forms.Application]::Run($appContext)

可行实现方案（WorkingButton.ps1） #

严格来说这不算纯WPF的最优解，但我通过PowerShell后台代码实现了需求：用一个隐藏的第二个按钮，在动画结束时切换两者的可见性，同时给动画添加FillBehavior="Stop"，确保动画完成后重置到初始位置，营造出单个按钮来回移动的效果。

Add-Type -AssemblyName PresentationFramework, System.Drawing, System.Windows.Forms, WindowsFormsIntegration, presentationCore
[xml]$xaml='
<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" WindowStartupLocation="CenterScreen" WindowStyle="None" Background="Transparent" AllowsTransparency="True" Width="500" Height="300">
    <Window.Resources>
        <ControlTemplate x:Key="NoMouseOverButtonTemplate" TargetType="Button">
            <Border Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}">
                <ContentPresenter HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
            </Border>
            <ControlTemplate.Triggers>
                <Trigger Property="IsEnabled" Value="False">
                    <Setter Property="Background" Value="{x:Static SystemColors.ControlLightBrush}"/>
                    <Setter Property="Foreground" Value="{x:Static SystemColors.GrayTextBrush}"/>
                </Trigger>
            </ControlTemplate.Triggers>
        </ControlTemplate>
    </Window.Resources>
    <Canvas>
        <Button Name="MovableButton1" Canvas.Left="70" Canvas.Top="0" FontSize="12" FontFamily="Calibri" FontWeight="Light" BorderBrush="#111111" Foreground="#EEEEEE" Background="#111111" Height="18" Width="70" Template="{StaticResource NoMouseOverButtonTemplate}">Button1<Button.Triggers>
            <EventTrigger RoutedEvent="PreviewMouseUp">
                <BeginStoryboard>
                    <Storyboard>
                        <DoubleAnimation Name="ButtonAnimation1" From="70" To="207" Duration="0:0:0.25" Storyboard.TargetProperty="(Canvas.Left)" AutoReverse="False" FillBehavior="Stop"/>
                    </Storyboard>
                </BeginStoryboard></EventTrigger>
            </Button.Triggers>
        </Button>
        <Button Name="MovableButton2" Canvas.Left="207" Canvas.Top="0" Visibility="Hidden" FontSize="12" FontFamily="Calibri" FontWeight="Light" BorderBrush="#111111" Foreground="#EEEEEE" Background="#111111" Height="18" Width="70" Template="{StaticResource NoMouseOverButtonTemplate}">Button2<Button.Triggers>
            <EventTrigger RoutedEvent="PreviewMouseUp">
                <BeginStoryboard>
                    <Storyboard>
                        <DoubleAnimation Name="ButtonAnimation2" From="207" To="70" Duration="0:0:0.25" Storyboard.TargetProperty="(Canvas.Left)" AutoReverse="False" FillBehavior="Stop"/>
                    </Storyboard>
                </BeginStoryboard></EventTrigger>
            </Button.Triggers>
        </Button>
    </Canvas>
</Window>'
$reader=(New-Object System.Xml.XmlNodeReader $xaml)
$window=[Windows.Markup.XamlReader]::Load($reader)
$Button1=$Window.FindName("MovableButton1")
$Button2=$Window.FindName("MovableButton2")
$ButtonAnimation1=$Window.FindName("ButtonAnimation1")
$ButtonAnimation2=$Window.FindName("ButtonAnimation2")
$Button1.Add_Click({
    write-host 第一个按钮被点击
})
$Button2.Add_Click({
    write-host 第二个按钮被点击
})
$ButtonAnimation1.Add_Completed({
    write-host 动画完成
    $Button1.Visibility="Hidden"
    $Button2.Visibility="Visible"
})
$ButtonAnimation2.Add_Completed({
    write-host 动画完成
    $Button1.Visibility="Visible"
    $Button2.Visibility="Hidden"
})
$window.Show()
$appContext=New-Object System.Windows.Forms.ApplicationContext
[void][System.Windows.Forms.Application]::Run($appContext)

内容的提问来源于stack exchange，提问作者PlayLORD-SysOp