private void OnLoaded(object sender, RoutedEventArgs e)
{
return;
var scrollViewer = ScrollingHost.GetScrollViewer();
if (scrollViewer == null)
{
return;
}
var properties = ElementCompositionPreview.GetScrollViewerManipulationPropertySet(scrollViewer);
var header = ElementCompositionPreview.GetElementVisual(HeaderPanel);
var info = ElementCompositionPreview.GetElementVisual(ScrollingInfo);
var photo = ElementCompositionPreview.GetElementVisual(Photo);
var title = ElementCompositionPreview.GetElementVisual(LabelTitle);
var subtitle = ElementCompositionPreview.GetElementVisual(Subtitle);
var action = ElementCompositionPreview.GetElementVisual(SendMessage);
if (ApiInformation.IsMethodPresent("Windows.UI.Composition.Compositor", "CreateLinearGradientBrush"))
{
var overlay = photo.Compositor.CreateSpriteVisual();
var gradient = overlay.Compositor.CreateLinearGradientBrush();
gradient.ColorStops.Add(overlay.Compositor.CreateColorGradientStop(0, ((SolidColorBrush)App.Current.Resources["PageHeaderBackgroundBrush"]).Color));
gradient.ColorStops.Add(overlay.Compositor.CreateColorGradientStop(1, ((SolidColorBrush)App.Current.Resources["PageSubHeaderBackgroundBrush"]).Color));
gradient.StartPoint = new Vector2();
gradient.EndPoint = new Vector2(0, 1);
overlay.Brush = gradient;
overlay.Size = new Vector2((float)HeaderOverlay.ActualWidth, (float)HeaderOverlay.ActualHeight);
HeaderOverlay.SizeChanged += (s, args) =>
{
overlay.Size = args.NewSize.ToVector2();
};
ElementCompositionPreview.SetElementChildVisual(HeaderOverlay, overlay);
var animOverlay = header.Compositor.CreateExpressionAnimation("Min(76, -Min(scrollViewer.Translation.Y, 0)) / 38");
animOverlay.SetReferenceParameter("scrollViewer", properties);
overlay.StartAnimation("Scale.Y", animOverlay);
}
var animClip = header.Compositor.CreateExpressionAnimation("Min(76, -Min(scrollViewer.Translation.Y, 0))");
animClip.SetReferenceParameter("scrollViewer", properties);
header.Clip = header.Compositor.CreateInsetClip(0, -32, -12, 0);
header.Clip.StartAnimation("BottomInset", animClip);
var animPhotoOffsetY = header.Compositor.CreateExpressionAnimation("-(Min(76, -Min(scrollViewer.Translation.Y, 0)) / 76 * 41)");
animPhotoOffsetY.SetReferenceParameter("scrollViewer", properties);
var animPhotoOffsetX = header.Compositor.CreateExpressionAnimation("Min(76, -Min(scrollViewer.Translation.Y, 0)) / 76 * 28");
animPhotoOffsetX.SetReferenceParameter("scrollViewer", properties);
var animPhotoScale = header.Compositor.CreateExpressionAnimation("1 -(Min(76, -Min(scrollViewer.Translation.Y, 0)) / 76 * (34 / 64))");
animPhotoScale.SetReferenceParameter("scrollViewer", properties);
photo.StartAnimation("Offset.Y", animPhotoOffsetY);
photo.StartAnimation("Offset.X", animPhotoOffsetX);
photo.StartAnimation("Scale.X", animPhotoScale);
photo.StartAnimation("Scale.Y", animPhotoScale);
var animTitleY = header.Compositor.CreateExpressionAnimation("-(Min(76, -Min(scrollViewer.Translation.Y, 0)) / 76 * 58)");
animTitleY.SetReferenceParameter("scrollViewer", properties);
var animTitleX = header.Compositor.CreateExpressionAnimation("-(Min(76, -Min(scrollViewer.Translation.Y, 0)) / 76 * 6)");
animTitleX.SetReferenceParameter("scrollViewer", properties);
title.StartAnimation("Offset.Y", animTitleY);
title.StartAnimation("Offset.X", animTitleX);
subtitle.StartAnimation("Offset.Y", animTitleY);
subtitle.StartAnimation("Offset.X", animTitleX);
var animInfoY = header.Compositor.CreateExpressionAnimation("-(Min(76, -Min(scrollViewer.Translation.Y, 0)) / 76 * 40)");
animInfoY.SetReferenceParameter("scrollViewer", properties);
var animOpacity = header.Compositor.CreateExpressionAnimation("1 -(Min(76, -Min(scrollViewer.Translation.Y, 0)) / 76)");
animOpacity.SetReferenceParameter("scrollViewer", properties);
info.StartAnimation("Offset.Y", animInfoY);
info.StartAnimation("Opacity", animOpacity);
action.CenterPoint = new Vector3(18);
action.StartAnimation("Opacity", animOpacity);
action.StartAnimation("Scale.X", animOpacity);
action.StartAnimation("Scale.Y", animOpacity);
}
public ScrollViewer GetScrollViewer()
{
return(ScrollingHost.GetScrollViewer());
}