private void Page_Loaded(object sender, RoutedEventArgs e)
{
Compositor compositor = ElementCompositionPreview.GetElementVisual(this).Compositor;
// Get scrollviewer
ScrollViewer myScrollViewer = ThumbnailList.GetFirstDescendantOfType <ScrollViewer>();
_scrollProperties = ElementCompositionPreview.GetScrollViewerManipulationPropertySet(myScrollViewer);
// Setup the expression
var scrollPropSet = _scrollProperties.GetSpecializedReference <ManipulationPropertySetReferenceNode>();
var startOffset = ExpressionValues.Constant.CreateConstantScalar("startOffset", 0.0f);
var parallaxValue = 0.5f;
var parallax = (scrollPropSet.Translation.Y + startOffset);
_parallaxExpression = parallax * parallaxValue - parallax;
ThumbnailList.ItemsSource = LocalDataSource.RandomizeDataSource(Model.Nature);
}
private void Page_Loaded(object sender, RoutedEventArgs e)
{
Compositor compositor = ElementCompositionPreview.GetElementVisual(this).Compositor;
// Get scrollviewer
ScrollViewer myScrollViewer = ThumbnailList.GetFirstDescendantOfType <ScrollViewer>();
_scrollProperties = ElementCompositionPreview.GetScrollViewerManipulationPropertySet(myScrollViewer);
// Setup the expression
_parallaxExpression = compositor.CreateExpressionAnimation();
_parallaxExpression.SetScalarParameter("StartOffset", 0.0f);
_parallaxExpression.SetScalarParameter("ParallaxValue", 0.5f);
_parallaxExpression.SetScalarParameter("ItemHeight", 0.0f);
_parallaxExpression.SetReferenceParameter("ScrollManipulation", _scrollProperties);
_parallaxExpression.Expression = "(ScrollManipulation.Translation.Y + StartOffset - (0.5 * ItemHeight)) * ParallaxValue - (ScrollManipulation.Translation.Y + StartOffset - (0.5 * ItemHeight))";
ThumbnailList.ItemsSource = Model.Items;
}