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Clear ReferenceNode ParamNames before serializing each expression string to avoid collisions #4183

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Sep 14, 2021
Merged

Clear ReferenceNode ParamNames before serializing each expression string to avoid collisions #4183

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3 changes: 3 additions & 0 deletions Microsoft.Toolkit.Uwp.UI.Animations/Expressions/CompositionExtensions.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -176,6 +176,8 @@ public static void StartAnimation(this CompositionObject compObject, string prop
/// <param name="easing">The easing function to use when interpolating between frames.</param>
public static void InsertExpressionKeyFrame(this KeyFrameAnimation keyframeAnimation, float normalizedProgressKey, ExpressionNode expressionNode, CompositionEasingFunction easing = null)
{
expressionNode.ClearReferenceInfo();

keyframeAnimation.InsertExpressionKeyFrame(normalizedProgressKey, expressionNode.ToExpressionString(), easing);

expressionNode.SetAllParameters(keyframeAnimation);
Expand Down Expand Up @@ -252,6 +254,7 @@ private static ExpressionAnimation CreateExpressionAnimationFromNode(Compositor
// Only create a new animation if this node hasn't already generated one before, so we don't have to re-parse the expression string.
if (expressionNode.ExpressionAnimation == null)
{
expressionNode.ClearReferenceInfo();
expressionNode.ExpressionAnimation = compositor.CreateExpressionAnimation(expressionNode.ToExpressionString());
}

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14 changes: 14 additions & 0 deletions Microsoft.Toolkit.Uwp.UI.Animations/Expressions/ExpressionNodes/ExpressionNode.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -260,6 +260,20 @@ internal string ToExpressionString()
return ToExpressionStringInternal();
}

/// <summary>
/// Clears the reference information.
/// </summary>
/// <exception cref="System.Exception">Reference and paramName can't both be null</exception>
internal void ClearReferenceInfo()
{
_objRefList = null;
ParamName = null;
foreach (var child in Children)
{
child.ClearReferenceInfo();
}
}

/// <summary>
/// Ensures the reference information.
/// </summary>
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