wpf storyboard.Completed清空

WPF中的Storyboard是一个动画序列管理器，它可以帮助你在用户界面中添加平滑的过渡效果。Storyboard.Completed事件是在所有预设动画完成后触发的。当你设置Storyboard实例的Completed属性并关联一个事件处理程序时，一旦所有的动画都执行完毕，这个处理程序就会被执行。

例如，你可能会这样做：

<Storyboard x:Name="MyStoryboard">
    <!-- 添加一组动画 -->
</Storyboard>

然后在XAML或代码-behind中绑定并监听Completed事件：

<Button Click="Button_Clicked">
    <i:Interaction.Triggers>
        <i:EventTrigger EventName="Completed">
            <local:ResetStoryboardAction Storyboard="{Binding ElementName=MyStoryboard}"/>
        </i:EventTrigger>
    </i:Interaction.Triggers>
</Button>

private void Button_Clicked(object sender, RoutedEventArgs e)
{
    MyStoryboard.Begin();
}

// ResetStoryboardAction是一个自定义行为，用于在Storyboard.Completed后重置状态
public class ResetStoryboardAction : TriggerAction<Storyboard>
{
    public static readonly DependencyPropertyStoryboardProperty = DependencyProperty.Register("Storyboard", typeof(Storyboard), typeof(ResetStoryboardAction), new FrameworkPropertyMetadata(null));

    public storyboard:Storyboard Storyboard
    {
        get => (Storyboard)GetValue(StoryboardProperty);
        set => SetValue(StoryboardProperty, value);
    }

    protected override void Invoke(object parameter)
    {
        Storyboard storyboard = Storyboard;
        if (storyboard != null)
        {
            storyboard.Stop();
            // 清空相关变量或状态，这里是示例
            storyboard Completed -= OnStoryboardCompleted;
        }
    }

    private void OnStoryboardCompleted(object sender, EventArgs e)
    {
        // 在这里执行清理操作
    }
}