CompositionAnimation.SetExpressionReferenceParameter Method

Reference

Definition

Namespace:: Windows.UI.Composition

Important

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Edit

Sets an object that implements IAnimationObject as a reference parameter in an ExpressionAnimation.

public:
 virtual void SetExpressionReferenceParameter(Platform::String ^ parameterName, IAnimationObject ^ source) = SetExpressionReferenceParameter;

void SetExpressionReferenceParameter(winrt::hstring const& parameterName, IAnimationObject const& source);

public void SetExpressionReferenceParameter(string parameterName, IAnimationObject source);

function setExpressionReferenceParameter(parameterName, source)

Public Sub SetExpressionReferenceParameter (parameterName As String, source As IAnimationObject)

Parameters

parameterName: String
Platform::String

winrt::hstring

The name of the parameter to set.

source: IAnimationObject

The source object.

Windows requirements

Device family	Windows 10, version 1809 (introduced in 10.0.17763.0)
API contract	Windows.Foundation.UniversalApiContract (introduced in v7.0)

Examples

// CustomObject that implements IAnimationObject.
class CustomObject : IAnimationObject
{
    public CustomObject(Compositor compositor)
    {
        _targetVisual = compositor.CreateSpriteVisual();
    }

    // Implement PopulatePropertyInfo method that 
    // redirects the property named "CustomOffset"
    // to the Offset property of the underlying visual.
    void IAnimationObject.PopulatePropertyInfo(
        string propertyName,
        AnimationPropertyInfo propertyInfo)
    {
        if (propertyName.Equals(“CustomOffset”)
        {
            _targetVisual.PopulatePropertyInfo(
                “Offset”,
                propertyInfo);           
        }
    }

    private SpriteVisual _targetVisual = null;
}

// Sample usage of CustomObject in an ExpressionAnimation.
void SetupExpression(
    Compositor compositor, 
    IAnimationObject customObject,
    SpriteVisual target)
{
    var expAnim = compositor.CreateExpressionAnimation(
        “customObject.CustomOffset + vector3(100.0f, 0.0f, 0.0f)”);

    expAnim.SetExpressionReferenceParameter(“customObject”, customObject);

    targetVisual.StartAnimation(“Offset”, expAnim);        
}

Applies to

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