wpf - 以编程方式反转 Storyboard

Question

我有以下 Storyboard:

<Window.Resources>
    <Storyboard x:Key="ButtonsAnim">
        <DoubleAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetName="topRightButton" Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[3].(TranslateTransform.Y)">
            <SplineDoubleKeyFrame KeyTime="00:00:00" Value="0"/>
            <SplineDoubleKeyFrame KeyTime="00:00:00.2000000" Value="-100"/>
        </DoubleAnimationUsingKeyFrames>
        <DoubleAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetName="topRightButton" Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[3].(TranslateTransform.X)">
            <SplineDoubleKeyFrame KeyTime="00:00:00" Value="0"/>
            <SplineDoubleKeyFrame KeyTime="00:00:00.2000000" Value="100"/>
...

它基本上在 Canvas 中移动一些按钮。

这是启动动画的代码:

void MainWindow_Loaded(object sender, RoutedEventArgs e)
{
    Storyboard sb = (Storyboard)Resources["ButtonsAnim"];
    storyBoard = sb;
    storyBoard.Begin(this, true);

}

我想要做的是当我单击隐藏窗口的按钮时重置动画。当窗口重新出现时，动画应从头开始。

当应用程序重新出现时，我尝试使用storyBoard.Begin(this, true)，但在最初的几毫秒内，按钮位于最后的位置。

然后我在隐藏窗口之前尝试了storyBoard.seek(TimeSpan.Zero)，但失败了:

System.Windows.Media.Animation Warning: 6 : Unable to perform action because the specified Storyboard was never applied to this object for interactive control.; Action='Seek'; Storyboard='System.Windows.Media.Animation.Storyboard'; Storyboard.HashCode='24901833'; Storyboard.Type='System.Windows.Media.Animation.Storyboard'; TargetElement='System.Windows.Media.Animation.Storyboard'; TargetElement.HashCode='24901833'; TargetElement.Type='System.Windows.Media.Animation.Storyboard'

在隐藏窗口之前我也尝试过storyBoard.remove(this)，效果相同:按钮位于最后的位置。

有什么想法吗？

谢谢。

Answer 1

要以这种方式使用 StoryBoard.Remove() - 您应该保留对 Storyboard 对象的引用。

像这样:

Storyboard myStoryBoard; 

void MainWindow_Loaded(object sender, RoutedEventArgs e)
{
    myStoryBoard = (Storyboard)Resources["myStoryBoard"];
    myStoryBoard.Begin();

}

void sbRemoveEvent()
{
    myStoryBoard.Remove();  
}