相关疑难解决方法(0)

我们有一个简单的动画,在检查和取消选中ToggleButton时运行(展开ListView的高度,然后折叠ListView的高度).如何在以下XAML中<Storyboard x:Key="CommentsCollapse">的GridConnge绑定更改时触发EventTrigger(或Animation)x:Name="DetailsGrid"？

换句话说,每当"DetailsGrid"的Binding更改时,我们都希望触发"CommentsCollapse"StoryBoard以确保ListView返回到其折叠状态.

<Page
   xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
   xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
   Width="800"
   Height="400">
   <Page.Resources>
      <Storyboard x:Key="CommentsExpand">
         <DoubleAnimationUsingKeyFrames
            BeginTime="00:00:00"
            Storyboard.TargetName="CommentsListView"
            Storyboard.TargetProperty="(FrameworkElement.Height)">
            <SplineDoubleKeyFrame KeyTime="00:00:00.200" Value="300"/>
         </DoubleAnimationUsingKeyFrames>
      </Storyboard>
      <Storyboard x:Key="CommentsCollapse">
         <DoubleAnimationUsingKeyFrames
            BeginTime="00:00:00"
            Storyboard.TargetName="CommentsListView"
            Storyboard.TargetProperty="(FrameworkElement.Height)">
            <SplineDoubleKeyFrame KeyTime="00:00:00.200" Value="75"/>
         </DoubleAnimationUsingKeyFrames>
      </Storyboard>
   </Page.Resources>
   <Page.Triggers>
      <EventTrigger RoutedEvent="ToggleButton.Checked" SourceName="CommentsToggleButton">
         <BeginStoryboard Storyboard="{StaticResource CommentsExpand}"/>
      </EventTrigger>
      <EventTrigger RoutedEvent="ToggleButton.Unchecked" SourceName="CommentsToggleButton">
         <BeginStoryboard Storyboard="{StaticResource CommentsCollapse}"/>
      </EventTrigger>
   </Page.Triggers>
   <Grid DataContext="{Binding Path=CurrentTask.Workflow.Invoice}" x:Name="DetailsGrid">
      <StackPanel Orientation="Horizontal">
         <Canvas Width="428">
            <GroupBox Width="422" Margin="5,0,0,0">
               <GroupBox.Header>
                  <StackPanel Orientation="Horizontal">
                     <ToggleButton
                        x:Name="CommentsToggleButton"
                        Width="20"
                        Height="10"
                        Margin="5,0,0,0">
                        <ToggleButton.Content>
                           <Rectangle
                              Width="5"
                              Height="5"
                              Fill="Red"/>
                        </ToggleButton.Content>
                     </ToggleButton>
                     <TextBlock Foreground="Blue" …