如何在ViewModel中播放Storyboard？

Question

我在View中捍卫了Storyborad

  <Storyboard x:Key="ExpandAdd" >
            <ObjectAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetName="AddUsers" Storyboard.TargetProperty="(UIElement.Visibility)">
                <DiscreteObjectKeyFrame KeyTime="00:00:00" Value="{x:Static Visibility.Collapsed}"/>
                <DiscreteObjectKeyFrame KeyTime="00:00:00.3000000" Value="{x:Static Visibility.Visible}"/>
            </ObjectAnimationUsingKeyFrames>
            <DoubleAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetName="DetailBorder" Storyboard.TargetProperty="(UIElement.Opacity)">
                <SplineDoubleKeyFrame KeyTime="00:00:00" Value="1"/>
                <SplineDoubleKeyFrame KeyTime="00:00:00.3000000" Value="0.4"/>
            </DoubleAnimationUsingKeyFrames>
            <BooleanAnimationUsingKeyFrames BeginTime="00:00:00" Duration="00:00:00.0010000" Storyboard.TargetName="DetailBorder" Storyboard.TargetProperty="(UIElement.IsEnabled)">
                <DiscreteBooleanKeyFrame KeyTime="00:00:00" Value="False"/>
            </BooleanAnimationUsingKeyFrames>
        </Storyboard>

我有一个按钮并绑定到relaycommand。

<Button x:Name="AddUserButton"  Content="?????">
   <i:Interaction.Triggers>
      <i:EventTrigger EventName="Click">
        <cmd:EventToCommand Command="{Binding AddUsers}"/>
      </i:EventTrigger>
   </i:Interaction.Triggers>
</Button>

我想在执行RelayCommand（AddUsers）时播放情节提要。

Answer 1

您不应该Storyboard从中访问ViewModel。它MVVM完全违背了目的。

您可以将故事板应用于Button.LostMouseCapture事件，该事件在您的命令在Click事件上被调用后会触发

<Button x:Name="AddUserButton"  Content="?????">
   <i:Interaction.Triggers>
      <i:EventTrigger EventName="Click">
        <cmd:EventToCommand Command="{Binding AddUsers}"/>
      </i:EventTrigger>
   </i:Interaction.Triggers>
   <Button.Triggers>
       <EventTrigger RoutedEvent="Button.LostMouseCapture">
            <BeginStoryboard Storyboard="{StaticResource ExpandAdd}">
       </EventTrigger>
   </Button.Triggers>
</Button>