protected override void OnDisconnected(UIElement oldElement)
{
// Dispose Light and Composition resources when it is removed from the tree
HoverLight.RemoveTargetElement(GetId(), oldElement);
CompositionLight.Dispose();
_lightPositionExpression.Dispose();
_offsetAnimation.Dispose();
}
protected override void OnConnected(UIElement targetElement)
{
if (targetElement == null)
{
return;
}
Compositor compositor = Window.Current.Compositor;
// Create SpotLight and set its properties
SpotLight spotLight = compositor.CreateSpotLight();
spotLight.InnerConeColor = Colors.FloralWhite;
spotLight.OuterConeColor = Colors.FloralWhite;
spotLight.InnerConeAngleInDegrees = 0f;
spotLight.InnerConeIntensity = 4;
//spotLight.OuterConeAngleInDegrees = 3f;
spotLight.ConstantAttenuation = 1f;
spotLight.LinearAttenuation = 0.253f;
spotLight.QuadraticAttenuation = 0.58f;
spotLight.Offset = new Vector3(0, 0, 0);
// Associate CompositionLight with XamlLight
this.CompositionLight = spotLight;
// Define resting position Animation
Vector3 restingPosition = new Vector3(200, 200, 400);
CubicBezierEasingFunction cbEasing = compositor.CreateCubicBezierEasingFunction(new Vector2(0.3f, 0.7f), new Vector2(0.9f, 0.5f));
_offsetAnimation = compositor.CreateVector3KeyFrameAnimation();
_offsetAnimation.InsertKeyFrame(1, restingPosition, cbEasing);
_offsetAnimation.Duration = TimeSpan.FromSeconds(0.5f);
//spotLight.Offset = restingPosition;
// Define expression animation that relates light's offset to pointer position
CompositionPropertySet hoverPosition = ElementCompositionPreview.GetPointerPositionPropertySet(targetElement);
_lightPositionExpression = compositor.CreateExpressionAnimation("Vector3(hover.Position.X, hover.Position.Y, height)");
_lightPositionExpression.SetReferenceParameter("hover", hoverPosition);
_lightPositionExpression.SetScalarParameter("height", 150f);
// Configure pointer entered/ exited events
targetElement.PointerMoved += TargetElement_PointerMoved;
targetElement.PointerExited += TargetElement_PointerExited;
// Add UIElement to the Light's Targets
HoverLight.AddTargetElement(GetId(), targetElement);
//MoveToRestingPosition();
}
