WPF停止可见性的情节提要板已更改

问题描述

限时删除！！

我有一个带故事板的UserControl，我想在控件的可见性更改时停止动画。

I have a UserControl with a story board and I want to stop the animation when the control's Visibility changes.

我创建了一个触发器来暂停动画并开始播放

I created a Trigger to pause the animation and start it depending on the state, but I keep getting an ArgumentException.

这里是XAML：

<UserControl.Triggers>
    <EventTrigger RoutedEvent="FrameworkElement.Loaded">
        <BeginStoryboard x:Name="ProgressAnimation_BeginStoryboard" Storyboard="{StaticResource ProgressAnimation}"/>
    </EventTrigger>
    <Trigger Property="Control.Visibility" Value="Collapsed">
        <PauseStoryboard BeginStoryboardName="ProgressAnimation_BeginStoryboard" />
    </Trigger>
    <Trigger Property="Control.Visibility" Value="Visible">
        <ResumeStoryboard BeginStoryboardName="ProgressAnimation_BeginStoryboard" />
    </Trigger>
</UserControl.Triggers>

这是例外：

如何在XAML中执行此操作？

How would I do this in XAML ?

谢谢，
Raul

Thanks,Raul

推荐答案

您可以使用控制模板来实现：

You may do it using a control template:

<ControlTemplate>
    ... Control stuff here

    <ControlTemplate.Triggers>
        <Trigger Property="Visibility" Value="Visible">
            <Trigger.EnterActions>
                <BeginStoryboard Storyboard="{StaticResource AnimationStoryboard}" x:Name="AnimationBeginStoryboard"/>
            </Trigger.EnterActions>
            <Trigger.ExitActions>
                <RemoveStoryboard BeginStoryboardName="AnimationBeginStoryboard"/>
            </Trigger.ExitActions>
        </Trigger>
    </ControlTemplate.Triggers>

</ControlTemplate>

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