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POWPF: Selecting the Target of an Animation
 

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  1. POWPF: Selecting the Target of an Animation
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    <p>I am trying to create a simple (I think) animation effect based on a property change in my ViewModel. I would like the target to be a specific textblock in the control template of a custom control, which inherits from Window.</p> <p>From the article examples I've seen, a DataTrigger is the easiest way to accomplish this. It appears that Window.Triggers doesn't support DataTriggers, which led me to try to apply the trigger in the style. The problem I am currently having is that I can't seem to target the TextBlock (or any other child control)--what happens is which the code below is that the animation is applied to the background of the whole window.</p> <p>If I leave off StoryBoard.Target completely, the effect is exactly the same.</p> <p>Is this the right approach with the wrong syntax, or is there an easier way to accomplish this?</p> <pre><code>&lt;Style x:Key="MyWindowStyle" TargetType="{x:Type Window}"&gt; &lt;Setter Property="Template" Value="{StaticResource MyWindowTemplate}"/&gt; &lt;Style.Triggers&gt; &lt;DataTrigger Binding="{Binding ChangeOccurred}" Value="True"&gt; &lt;DataTrigger.EnterActions&gt; &lt;BeginStoryboard&gt; &lt;Storyboard BeginTime="00:00:00" Duration="0:0:2" Storyboard.Target="{Binding RelativeSource={RelativeSource AncestorType=TextBlock}}" Storyboard.TargetProperty="(Background).(SolidColorBrush.Color)"&gt; &lt;ColorAnimation FillBehavior="Stop" From="Black" To="Red" Duration="0:0:0.5" AutoReverse="True"/&gt; &lt;/Storyboard&gt; &lt;/BeginStoryboard&gt; &lt;/DataTrigger.EnterActions&gt; &lt;/DataTrigger&gt; &lt;/Style.Triggers&gt; &lt;/Style&gt; </code></pre> <p><strong>Update</strong></p> <p>Should have also mentioned that I tried to name the TextBlock and reference it via StoryBoard.TargetName (as Timores suggested), and got the error "TargetName property cannot be set on a Style Setter."</p>
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    1. COWhat exactly is your desired animation target? You say *"a specific textblock in the control template of a custom control"*, but then create a style for a `Window` and not a custom control. Could you provide the code containing your animation target? The Target Binding above should not work since I do not expect the Window to have an ancestor of type TextBlock, does it?! Is this possible at all?
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    2. COSorry, it's a difficult setup to describe. The custom control *is* a window, as it derives from window. The setup/style was created by someone else, so I am trying to retrofit this animation. The Textblock is a child control--looking at this again, the RelativeSource/AncestorType is probably not even close, since I am trying to target a child and not a parent?
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      1. USPhil Sandler
 

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