如何在文本塊字符串上運行故事板在Silverlight中更改？

Question

我想知道如果任何簡單的技術來運行故事板，如果文本塊文本字符串已更改。先謝謝你！

Answer 1

下面是用戶控件的xaml，它將在TextBlock的Text屬性發生更改時爲項目的不透明度設置動畫。

它正在使用PropertyChangedTrigger和ControlStoryboard操作來引起這種情況發生。這些項目來自該得到安裝了混合的dll，但你可以單獨安裝他們，如果你不具備混合：Blend 4 SDK

<UserControl 
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
    xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity" 
    xmlns:ei="http://schemas.microsoft.com/expression/2010/interactions" 
    x:Class="TextboxAnimation.MainPage" 
    Width="640" Height="480"> 
    <UserControl.Resources> 
     <Storyboard x:Name="AnAnimation"> 
      <DoubleAnimationUsingKeyFrames 
       Storyboard.TargetProperty="(UIElement.Opacity)" 
       Storyboard.TargetName="animationTextBlock"> 
       <EasingDoubleKeyFrame KeyTime="0" Value="0"/> 
       <EasingDoubleKeyFrame KeyTime="0:0:1" Value="1"/> 
      </DoubleAnimationUsingKeyFrames> 
     </Storyboard> 
    </UserControl.Resources> 

    <StackPanel x:Name="LayoutRoot" Background="White"> 
     <TextBlock x:Name="textBlock" 
      HorizontalAlignment="Left" Text="Click Me To Change Text" 
      MouseLeftButtonDown="TextBlockClicked"> 
      <i:Interaction.Triggers> 
       <ei:PropertyChangedTrigger Binding="{Binding Text, ElementName=textBlock}"> 
        <ei:ControlStoryboardAction Storyboard="{StaticResource AnAnimation}"/> 
       </ei:PropertyChangedTrigger> 
      </i:Interaction.Triggers> 
     </TextBlock> 
     <TextBlock 
      x:Name="animationTextBlock" 
      Text="Animate Me!" Margin="0,8,0,0" Opacity="0"/> 
    </StackPanel> 
</UserControl> 

下面是用於點擊事件，這改變了TextBlock的背後的代碼Text屬性：

int times = 0; 

private void TextBlockClicked(object sender, System.Windows.Input.MouseButtonEventArgs e) 
{ 
    times++; 

    textBlock.Text = String.Format("I've been clicked and changed {0} times!", times); 
}