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POCan't set Storyboard.TargetProperty to CompositeTransform.Rotation in Metro style app from code
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  1. POCan't set Storyboard.TargetProperty to CompositeTransform.Rotation in Metro style app from code
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    copied!<p>I'm messing around with some Storyboards in a Metro XAML app. I have to create a <code>Storyboard</code> in code. I'd like to set the <code>Storyboard.TargetProperty</code> to <code>CompositeTransform.Rotation</code></p> <p>It seems impossible...</p> <p>My Storyboard in XAML looks like this:</p> <pre><code>&lt;Storyboard&gt; &lt;DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.RenderTransform).(CompositeTransform.Rotation)" Storyboard.TargetName="grid"&gt; &lt;EasingDoubleKeyFrame KeyTime="0" Value="0"/&gt; &lt;EasingDoubleKeyFrame KeyTime="0:0:0.3" Value="60"/ &lt;/DoubleAnimationUsingKeyFrames&gt; &lt;/Storyboard&gt; </code></pre> <p>I'd like to create something similar.<br/> <strong>Important:</strong> I am not trying to <em>recreate</em> this exact Storyboard. I am inside the code of a custom <code>ContentControl</code>, so <code>this</code> is the <code>Control</code>, and there's no "grid" to target the animation to. The target is the control itself, which has <code>CompositeTransform</code> previously set.<br/><br/> My code so far is like this:</p> <pre><code>var turnSB = new Storyboard(); var doubleAnim = new DoubleAnimationUsingKeyFrames(); doubleAnim.KeyFrames.Add(new EasingDoubleKeyFrame() { KeyTime = TimeSpan.FromMilliseconds(0), Value = currentAngle }); doubleAnim.KeyFrames.Add(new EasingDoubleKeyFrame() { KeyTime = TimeSpan.FromMilliseconds(500), Value = targetAngle }); turnSB.Children.Add(doubleAnim); Storyboard.SetTarget(doubleAnim, this.RenderTransform); Storyboard.SetTargetProperty(doubleAnim, "(CompositeTransform.Rotation)"); turnSB.Begin(); </code></pre> <p>As soon as it hits the Begin method I get an Exception saying that (CompositeTransform.Rotation) cannot be resolved. So I'm guessing I didn't got the property path quite right. I've tried different variations, but according to PropertyPaths, this should be the correct one, shouldn't it? :S</p> <p>If this is an unsolvable problem, I'm open to suggestions on a workaround...</p> <p><strong>EDIT:</strong></p> <p>I think I have solved the problem for now. I have some interesting findings though... <br/><br/> If I make a UserControl I can do practically anything. Everything works, I can set the Storyboard.Targetproperty, and the animation plays correctly. <br/><br/> However if I use a custom control, or inherit from another control (say ContentControl), I can't start a Storyboard from code, only in some cases. <br/><br/> For example: If I make a storyboard (defined in XAML) to animate Rotation (or any transformation property for that matter) and try to start from code, I get the above exception. But If I animate a simple property, say Opacity, it works fine. <br/>(I did the same with a UserControl, and it worked.) <br/> <br/> Can someone explain this?</p>
 

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