CompositionAnimation.SetExpressionReferenceParameter 方法

定义

命名空间:

Windows.UI.Composition

设置一个对象，该对象实现 IAnimationObject 作为 ExpressionAnimation 中的引用参数。

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)

参数

parameterName

String

Platform::String

winrt::hstring

要设置的参数的名称。

source

IAnimationObject

源对象。

Windows 要求

设备系列	Windows 10, version 1809 (在 10.0.17763.0 中引入)
API contract	Windows.Foundation.UniversalApiContract (在 v7.0 中引入)

示例

// 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);        
}