private void ConfigureTemplateAnimations()
{
var propSetProgress = _props.GetReference().GetScalarProperty("progress");
var trackerNode = _tracker.GetReference();
foreach (var itemRendered in itemsRendered.Items)
{
var template = itemRendered.Item2;
template.GetVisual().StopAnimation("offset.x");
template.GetVisual().StopAnimation("Scale");
template.GetVisual().StartAnimation("offset.x", _props.GetReference().GetScalarProperty("position") + itemRendered.Item1 * _itemWidth);
float positionCenter = (itemRendered.Item1 * _itemWidth);
float position = (itemRendered.Item1 * _itemWidth) - _itemWidth / 2;
float positionEnd = (itemRendered.Item1 * _itemWidth) + _itemWidth / 2;
template.GetVisual()
.StartAnimation("Scale",
EF.Vector3(1, 1, 1) * EF.Conditional(trackerNode.Position.X > position & trackerNode.Position.X < positionEnd
, EF.Lerp(1.2f, 1, EF.Abs(positionCenter - trackerNode.Position.X) / (_itemWidth / 2))
, 1));
template.BackgroundPanel
.StartAnimation("Scale",
EF.Vector3(1, 1, 1) * EF.Conditional(trackerNode.Position.X > position & trackerNode.Position.X < positionEnd
, EF.Lerp(1.1f, 1, EF.Abs(positionCenter - trackerNode.Position.X) / (_itemWidth / 2))
, 1));
template.Shadow
.StartAnimation("opacity",
EF.Conditional(trackerNode.Position.X > position & trackerNode.Position.X < positionEnd
, EF.Lerp(1, 0, EF.Abs(positionCenter - trackerNode.Position.X) / (_itemWidth / 2))
, 0));
template.ContentPanel
.StartAnimation("opacity",
EF.Conditional(trackerNode.Position.X > position & trackerNode.Position.X < positionEnd
, EF.Lerp(1, 0, EF.Abs(positionCenter - trackerNode.Position.X) / (_itemWidth / 2))
, 0));
template.OverlayPanel
.StartAnimation("opacity",
EF.Conditional(trackerNode.Position.X > position & trackerNode.Position.X < positionEnd
, EF.Lerp(0, 0.6f, EF.Abs(positionCenter - trackerNode.Position.X) / (_itemWidth / 2))
, 0.6f));
}
}
private void Header_Loaded(object sender, RoutedEventArgs e)
{
var scrollviewer = MainScroller;
_scrollerPropertySet = ElementCompositionPreview.GetScrollViewerManipulationPropertySet(scrollviewer);
_compositor = _scrollerPropertySet.Compositor;
_props = _compositor.CreatePropertySet();
_props.InsertScalar("progress", 0);
// Get references to our property sets for use with ExpressionNodes
var scrollingProperties = _scrollerPropertySet.GetSpecializedReference <ManipulationPropertySetReferenceNode>();
var props = _props.GetReference();
var progressNode = props.GetScalarProperty("progress");
// Create and start an ExpressionAnimation to track scroll progress over the desired distance
ExpressionNode progressAnimation = EF.Clamp(-scrollingProperties.Translation.Y / ((float)Header.Height), 0, 1);
_props.StartAnimation("progress", progressAnimation);
var headerbgVisual = ElementCompositionPreview.GetElementVisual(HeaderBG);
var bgblurOpacityAnimation = EF.Clamp(progressNode, 0, 1);
headerbgVisual.StartAnimation("Opacity", bgblurOpacityAnimation);
}
private void page_Loaded(object sender, RoutedEventArgs e)
{
Loaded -= page_Loaded;
spVisual = ElementCompositionPreview.GetElementVisual(spContent);
btnScrollVisual = ElementCompositionPreview.GetElementVisual(btn_Scroll);
compositor = spVisual.Compositor;
tracker = InteractionTracker.Create(compositor);
var tref = tracker.GetReference();
var trackerTarget = ExpressionValues.Target.CreateInteractionTrackerTarget();
var endpoint1 = InteractionTrackerInertiaRestingValue.Create(compositor);
endpoint1.SetCondition(trackerTarget.NaturalRestingPosition.Y < (trackerTarget.MaxPosition.Y - trackerTarget.MinPosition.Y) / 2);
endpoint1.SetRestingValue(trackerTarget.MinPosition.Y);
var endpoint2 = InteractionTrackerInertiaRestingValue.Create(compositor);
endpoint2.SetCondition(trackerTarget.NaturalRestingPosition.Y >= (trackerTarget.MaxPosition.Y - trackerTarget.MinPosition.Y) / 2);
endpoint2.SetRestingValue(trackerTarget.MaxPosition.Y);
tracker.ConfigurePositionYInertiaModifiers(new InteractionTrackerInertiaModifier[] { endpoint1, endpoint2 });
interactionSource = VisualInteractionSource.Create(spVisual);
interactionSource.PositionYSourceMode = InteractionSourceMode.EnabledWithInertia;
tracker.InteractionSources.Add(interactionSource);
propertySet = compositor.CreatePropertySet();
propertySet.InsertScalar("progress", 0.0f);
propertySet.StartAnimation("progress", tref.Position.Y / tref.MaxPosition.Y);
var progress = propertySet.GetReference().GetScalarProperty("progress");
btnScrollVisual.StartAnimation("RotationAngleInDegrees", ExpressionFunctions.Clamp(progress, 0f, 1f) * 180);
btnScrollVisual.CenterPoint = new System.Numerics.Vector3((float)btn_Scroll.ActualWidth / 2, (float)btn_Scroll.ActualHeight / 2, 0);
spVisual.StartAnimation("Offset.Y", -ExpressionFunctions.Clamp(progress, -0.4f, 1.4f) * tref.MaxPosition.Y);
gdInfo_SizeChanged(this, null);
}
private void OnPageLoaded(object sender, RoutedEventArgs e)
{
var animationService = ConnectedAnimationService.GetForCurrentView();
var animation = animationService.GetAnimation(Constants.ConnectedAnimationKey);
if (animation != null)
{
animation.TryStart(CoverImage, new UIElement[] { SetImage });
}
// Get the PropertySet that contains the scroll values from MyScrollViewer
_scrollerPropertySet = ElementCompositionPreview.GetScrollViewerManipulationPropertySet(MyScrollviewer);
_compositor = _scrollerPropertySet.Compositor;
// Create a PropertySet that has values to be referenced in the ExpressionAnimations below
_props = _compositor.CreatePropertySet();
_props.InsertScalar("progress", 0);
_props.InsertScalar("clampSize", 100);
// Get references to our property sets for use with ExpressionNodes
var scrollingProperties = _scrollerPropertySet.GetSpecializedReference <ManipulationPropertySetReferenceNode>();
var props = _props.GetReference();
var progressNode = props.GetScalarProperty("progress");
var clampSizeNode = props.GetScalarProperty("clampSize");
// Create and start an ExpressionAnimation to track scroll progress over the desired distance
var progressAnimation = ExpressionFunctions.Clamp(-scrollingProperties.Translation.Y / clampSizeNode, 0, 1);
_props.StartAnimation("progress", progressAnimation);
// Get the backing visual for the header so that its properties can be animated
var headerVisual = ElementCompositionPreview.GetElementVisual(Header);
// Create and start an ExpressionAnimation to clamp the header's offset to keep it onscreen
var headerTranslationAnimation = ExpressionFunctions.Conditional(progressNode < 1, 0, -scrollingProperties.Translation.Y - clampSizeNode);
headerVisual.StartAnimation("Offset.Y", headerTranslationAnimation);
// Create and start an ExpressionAnimation to scale the header during overpan
var headerScaleAnimation = ExpressionFunctions.Lerp(1, 1.25f, ExpressionFunctions.Clamp(scrollingProperties.Translation.Y / 50, 0, 1));
headerVisual.StartAnimation("Scale.X", headerScaleAnimation);
headerVisual.StartAnimation("Scale.Y", headerScaleAnimation);
//Set the header's CenterPoint to ensure the overpan scale looks as desired
headerVisual.CenterPoint = new Vector3((float)(Header.ActualWidth / 2), (float)Header.ActualHeight, 0);
}
private async void OnCardChromeHolding(object sender, HoldingRoutedEventArgs e)
{
if (e.PointerDeviceType == PointerDeviceType.Touch && e.HoldingState == HoldingState.Started)
{
// To create a continuous video playing experience, let's pause it here.
_mediaElement.Pause();
// Record the location as we want to resume from here on another device.
_mediaPlayedPosition = _mediaElement.Position;
// We don't want to visually move the video player. Instead, we want to create the illusion that
// a "copy" of it is being dragged down to another device. So here we use RenderTargetBitmap to
// create such visual.
var bitmap = new RenderTargetBitmap();
await bitmap.RenderAsync(Card);
MediaCopy.Source = bitmap;
MediaContainer.IsHitTestVisible = false;
// Create animations to show that a "copy" of the video player is popped up and ready to be dragged up.
Card.Fade(0.3f).Start();
MediaCopy
.Fade(0.7f, 1)
.Then()
.Scale(0.975f, 0.975f, (float)Card.ActualWidth / 2, (float)Card.ActualHeight / 2, 300d)
.Then()
.Offset(offsetY: -24.0f, duration: 400d)
.Start();
// Create an animation that changes the offset of the "copy" based on the manipulation progress.
_mediaCopyVisual = VisualExtensions.GetVisual(MediaCopy);
var progressExpressionNode = _progress.GetReference().GetScalarProperty("Progress");
_mediaCopyVisual.StartAnimation("Offset.Y", progressExpressionNode * -_maxDistance);
try
{
// Let InteractionTracker to handle the swipe gesture.
_interactionSource.TryRedirectForManipulation(_pressedPoint);
// Send the card json and media played position over using Remote Sessions API.
await RomeShare.SendMediaDataAsync(_cardJson, _mediaPlayedPosition, MediaUrl);
}
catch (UnauthorizedAccessException) { }
}
}
// This is for click-to-seek. Event current commented out on the trackCanvas, weird eventing issues between when this event gets called and when need to call OnDragStart() and OnDragStop()
private void MousePointer_Pressed(object sender, PointerRoutedEventArgs e)
{
if (e.Pointer.PointerDeviceType == Windows.Devices.Input.PointerDeviceType.Mouse)
{
OnDragStart();
var xPosition = (float)e.GetCurrentPoint(trackCanvas).Position.X;
propSet.InsertVector3("xClickLocation", new System.Numerics.Vector3(-xPosition, 0f, 0f));
var pointerKFA = this.compositor.CreateVector3KeyFrameAnimation();
pointerKFA.Duration = TimeSpan.FromSeconds(1);
// pointerKFA.InsertExpressionKeyFrame(1f, "props.xClickLocation");
// pointerKFA.SetReferenceParameter("props", propSet);
pointerKFA.InsertExpressionKeyFrame(1f, propSet.GetReference().GetVector3Property("xClickLocation"));
this.tracker.TryUpdatePositionWithAnimation(pointerKFA);
}
}
private void Header_Loaded(object sender, RoutedEventArgs e)
{
var scrollviewer = MainScroller;
_scrollerPropertySet = ElementCompositionPreview.GetScrollViewerManipulationPropertySet(scrollviewer);
_compositor = _scrollerPropertySet.Compositor;
_props = _compositor.CreatePropertySet();
_props.InsertScalar("progress", 0);
_props.InsertScalar("clampSize", (float)HeaderBG.Height);
_props.InsertScalar("scaleFactor", 0.7f);
// Get references to our property sets for use with ExpressionNodes
var scrollingProperties = _scrollerPropertySet.GetSpecializedReference <ManipulationPropertySetReferenceNode>();
var props = _props.GetReference();
var progressNode = props.GetScalarProperty("progress");
var clampSizeNode = props.GetScalarProperty("clampSize");
var scaleFactorNode = props.GetScalarProperty("scaleFactor");
// Create and start an ExpressionAnimation to track scroll progress over the desired distance
var progressAnimation = EF.Clamp(-scrollingProperties.Translation.Y / clampSizeNode, 0, 1);
_props.StartAnimation("progress", progressAnimation);
var headerbgVisual = ElementCompositionPreview.GetElementVisual(HeaderBG);
var bgblurOpacityAnimation = EF.Clamp(progressNode, 0, 1);
headerbgVisual.StartAnimation("Opacity", bgblurOpacityAnimation);
var headerVisual = ElementCompositionPreview.GetElementVisual(HeroTitle);
var scaleAnimation = EF.Lerp(1, scaleFactorNode, progressNode);
headerVisual.StartAnimation("Scale.X", scaleAnimation);
headerVisual.StartAnimation("Scale.Y", scaleAnimation);
var offsetAnimation = EF.Lerp(160f, 32f, progressNode);
var opacityAnimation = EF.Lerp(1f, 0.6f, progressNode);
var containerVisual = ElementCompositionPreview.GetElementVisual(TextContainer);
containerVisual.StartAnimation("Offset.Y", offsetAnimation);
containerVisual.StartAnimation("Opacity", opacityAnimation);
}
private void SetupExpressionAnimationsForCard()
{
_cardVisual = VisualExtensions.GetVisual(Card);
_cardVisual.RelativeSizeAdjustment = Vector2.One;
_cardVisual.CenterPoint = new Vector3(Card.RenderSize.ToVector2() / 2, 0.0f);
var initialPositionY = (float)ActualHeight;
_cardVisual.Offset = new Vector3(0.0f, initialPositionY, 0.0f);
_progress.InsertScalar("Progress", 0);
var progressExpressionNode = _progress.GetReference().GetScalarProperty("Progress");
// Scale the card visual based on the progress.
_cardVisual.StartAnimation("Scale", EF.Vector3(1.0f, 1.0f, 1.0f) * EF.Lerp(0.6f, 1.0f, progressExpressionNode));
// Fade in the card visual based on the progress.
_cardVisual.StartAnimation("Opacity", EF.Lerp(0.0f, 1.0f, progressExpressionNode));
// Move the card visual based on the progress.
var offset = initialPositionY * (1.0f - progressExpressionNode);
_cardVisual.StartAnimation("Offset.Y", offset);
}
private void AlbumList_Loaded(object sender, RoutedEventArgs e)
{
var ani = ConnectedAnimationService.GetForCurrentView().GetAnimation(Consts.ArtistPageInAnimation);
if (ani != null)
{
ani.TryStart(Title, new UIElement[] { HeaderBG, Details });
}
var scrollviewer = AlbumList.GetScrollViewer();
_scrollerPropertySet = ElementCompositionPreview.GetScrollViewerManipulationPropertySet(scrollviewer);
_compositor = _scrollerPropertySet.Compositor;
_props = _compositor.CreatePropertySet();
_props.InsertScalar("progress", 0);
_props.InsertScalar("clampSize", (float)Title.ActualHeight + 64);
_props.InsertScalar("scaleFactor", 0.5f);
// Get references to our property sets for use with ExpressionNodes
var scrollingProperties = _scrollerPropertySet.GetSpecializedReference <ManipulationPropertySetReferenceNode>();
var props = _props.GetReference();
var progressNode = props.GetScalarProperty("progress");
var clampSizeNode = props.GetScalarProperty("clampSize");
var scaleFactorNode = props.GetScalarProperty("scaleFactor");
// Create and start an ExpressionAnimation to track scroll progress over the desired distance
ExpressionNode progressAnimation = EF.Clamp(-scrollingProperties.Translation.Y / ((float)Header.Height - clampSizeNode), 0, 1);
_props.StartAnimation("progress", progressAnimation);
// Get the backing visual for the header so that its properties can be animated
Visual headerVisual = ElementCompositionPreview.GetElementVisual(Header);
// Create and start an ExpressionAnimation to clamp the header's offset to keep it onscreen
ExpressionNode headerTranslationAnimation = EF.Conditional(progressNode < 1, scrollingProperties.Translation.Y, -(float)Header.Height + (float)Title.ActualHeight + 64);
headerVisual.StartAnimation("Offset.Y", headerTranslationAnimation);
//// Create and start an ExpressionAnimation to scale the header during overpan
//ExpressionNode headerScaleAnimation = EF.Lerp(1, 1.25f, EF.Clamp(scrollingProperties.Translation.Y / 50, 0, 1));
//headerVisual.StartAnimation("Scale.X", headerScaleAnimation);
//headerVisual.StartAnimation("Scale.Y", headerScaleAnimation);
////Set the header's CenterPoint to ensure the overpan scale looks as desired
//headerVisual.CenterPoint = new Vector3((float)(Header.ActualWidth / 2), (float)Header.ActualHeight, 0);
var titleVisual = ElementCompositionPreview.GetElementVisual(Title);
var titleshrinkVisual = ElementCompositionPreview.GetElementVisual(TitleShrink);
var fixAnimation = EF.Conditional(progressNode < 1, -scrollingProperties.Translation.Y, (float)Header.Height - ((float)Title.ActualHeight + 64));
titleVisual.StartAnimation("Offset.Y", fixAnimation);
titleshrinkVisual.StartAnimation("Offset.Y", fixAnimation);
var detailsVisual = ElementCompositionPreview.GetElementVisual(Details);
var opacityAnimation = EF.Clamp(1 - (progressNode * 8), 0, 1);
detailsVisual.StartAnimation("Opacity", opacityAnimation);
var headerbgVisual = ElementCompositionPreview.GetElementVisual(HeaderBG);
var headerbgOverlayVisual = ElementCompositionPreview.GetElementVisual(HeaderBGOverlay);
var bgBlurVisual = ElementCompositionPreview.GetElementVisual(BGBlur);
var bgOpacityAnimation = EF.Clamp(1 - progressNode, 0, 1);
var bgblurOpacityAnimation = EF.Clamp(progressNode, 0, 1);
titleshrinkVisual.StartAnimation("Opacity", bgblurOpacityAnimation);
titleVisual.StartAnimation("Opacity", bgOpacityAnimation);
headerbgVisual.StartAnimation("Opacity", bgOpacityAnimation);
headerbgOverlayVisual.StartAnimation("Opacity", bgOpacityAnimation);
bgBlurVisual.StartAnimation("Opacity", bgblurOpacityAnimation);
}
/// <summary>
/// Uses Composition API to get the UIElement and sets an ExpressionAnimation
/// The ExpressionAnimation uses the height of the UIElement to calculate an opacity value
/// for the Header as it is scrolling off-screen. The opacity reaches 0 when the Header
/// is entirely scrolled off.
/// </summary>
/// <returns><c>true</c> if the assignment was successful; otherwise, <c>false</c>.</returns>
private bool AssignAnimation()
{
StopAnimation();
if (AssociatedObject == null)
{
return(false);
}
if (_scrollViewer == null)
{
_scrollViewer = AssociatedObject as ScrollViewer ?? AssociatedObject.FindDescendant <ScrollViewer>();
}
if (_scrollViewer == null)
{
return(false);
}
var listView = AssociatedObject as Windows.UI.Xaml.Controls.ListViewBase ?? AssociatedObject.FindDescendant <Windows.UI.Xaml.Controls.ListViewBase>();
if (listView != null && listView.ItemsPanelRoot != null)
{
Canvas.SetZIndex(listView.ItemsPanelRoot, -1);
}
if (_scrollProperties == null)
{
_scrollProperties = ElementCompositionPreview.GetScrollViewerManipulationPropertySet(_scrollViewer);
}
if (_scrollProperties == null)
{
return(false);
}
// Implicit operation: Find the Header object of the control if it uses ListViewBase
if (HeaderElement == null && listView != null)
{
HeaderElement = listView.Header as UIElement;
}
var headerElement = HeaderElement as FrameworkElement;
if (headerElement == null || headerElement.RenderSize.Height == 0)
{
return(false);
}
if (_headerVisual == null)
{
_headerVisual = ElementCompositionPreview.GetElementVisual(headerElement);
}
if (_headerVisual == null)
{
return(false);
}
_scrollViewer.ViewChanged -= ScrollViewer_ViewChanged;
_scrollViewer.ViewChanged += ScrollViewer_ViewChanged;
_scrollViewer.GotFocus -= ScrollViewer_GotFocus;
_scrollViewer.GotFocus += ScrollViewer_GotFocus;
headerElement.SizeChanged -= ScrollHeader_SizeChanged;
headerElement.SizeChanged += ScrollHeader_SizeChanged;
var compositor = _scrollProperties.Compositor;
if (_animationProperties == null)
{
_animationProperties = compositor.CreatePropertySet();
_animationProperties.InsertScalar("OffsetY", 0.0f);
}
var propSetOffset = _animationProperties.GetReference().GetScalarProperty("OffsetY");
var scrollPropSet = _scrollProperties.GetSpecializedReference <ManipulationPropertySetReferenceNode>();
var expressionAnimation = ExpressionFunctions.Max(ExpressionFunctions.Min(propSetOffset, -scrollPropSet.Translation.Y), 0);
_headerVisual.StartAnimation("Offset.Y", expressionAnimation);
return(true);
}
/// <summary>
/// Uses Composition API to get the UIElement and sets an ExpressionAnimation
/// The ExpressionAnimation uses the height of the UIElement to calculate an opacity value
/// for the Header as it is scrolling off-screen. The opacity reaches 0 when the Header
/// is entirely scrolled off.
/// </summary>
/// <returns><c>true</c> if the assignment was successful; otherwise, <c>false</c>.</returns>
private bool AssignAnimation()
{
StopAnimation();
// Confirm that Windows.UI.Xaml.Hosting.ElementCompositionPreview is available (Windows 10 10586 or later).
if (!ApiInformation.IsMethodPresent("Windows.UI.Xaml.Hosting.ElementCompositionPreview", nameof(ElementCompositionPreview.GetScrollViewerManipulationPropertySet)))
{
// Just return true since it's not supported
return(true);
}
if (AssociatedObject == null)
{
return(false);
}
if (_scrollViewer == null)
{
_scrollViewer = AssociatedObject as ScrollViewer ?? AssociatedObject.FindDescendant <ScrollViewer>();
}
if (_scrollViewer == null)
{
return(false);
}
var listView = AssociatedObject as Windows.UI.Xaml.Controls.ListViewBase ?? AssociatedObject.FindDescendant <Windows.UI.Xaml.Controls.ListViewBase>();
if (listView != null && listView.ItemsPanelRoot != null)
{
Canvas.SetZIndex(listView.ItemsPanelRoot, -1);
}
if (_scrollProperties == null)
{
_scrollProperties = ElementCompositionPreview.GetScrollViewerManipulationPropertySet(_scrollViewer);
}
if (_scrollProperties == null)
{
return(false);
}
// Implicit operation: Find the Header object of the control if it uses ListViewBase
if (HeaderElement == null && listView != null)
{
HeaderElement = listView.Header as UIElement;
}
var headerElement = HeaderElement as FrameworkElement;
if (headerElement == null || headerElement.RenderSize.Height == 0)
{
return(false);
}
if (_headerVisual == null)
{
_headerVisual = ElementCompositionPreview.GetElementVisual(headerElement);
}
if (_headerVisual == null)
{
return(false);
}
headerElement.SizeChanged -= ScrollHeader_SizeChanged;
headerElement.SizeChanged += ScrollHeader_SizeChanged;
_scrollViewer.GotFocus -= ScrollViewer_GotFocus;
_scrollViewer.GotFocus += ScrollViewer_GotFocus;
var compositor = _scrollProperties.Compositor;
if (_animationProperties == null)
{
_animationProperties = compositor.CreatePropertySet();
_animationProperties.InsertScalar("OffsetY", 0.0f);
}
_previousVerticalScrollOffset = _scrollViewer.VerticalOffset;
var propSetOffset = _animationProperties.GetReference().GetScalarProperty("OffsetY");
var scrollPropSet = _scrollProperties.GetSpecializedReference <ManipulationPropertySetReferenceNode>();
var expressionAnimation = ExpressionFunctions.Max(propSetOffset - scrollPropSet.Translation.Y, 0);
_headerVisual.StartAnimation("Offset.Y", expressionAnimation);
return(true);
}
private void OnLoaded(object sender, RoutedEventArgs e)
{
var gridView = this.FindAscendant <GridView>();
if (gridView == null)
{
return;
}
var scrollViewer = gridView.FindDescendant <ScrollViewer>();
var headerPresenter = (UIElement)VisualTreeHelper.GetParent((UIElement)gridView.Header);
var headerContainer = (UIElement)VisualTreeHelper.GetParent(headerPresenter);
Canvas.SetZIndex(headerContainer, 1);
_scrollerPropertySet = scrollViewer.GetScrollViewerManipulationPropertySet();
_compositor = _scrollerPropertySet.Compositor;
_props = _compositor.CreatePropertySet();
_props.InsertScalar("progress", 0);
_props.InsertScalar("clampSize", 240);
_props.InsertScalar("scaleFactor", 0.7f);
var scrollingProperties = _scrollerPropertySet.GetSpecializedReference <ManipulationPropertySetReferenceNode>();
var props = _props.GetReference();
var progressNode = props.GetScalarProperty("progress");
var clampSizeNode = props.GetScalarProperty("clampSize");
var scaleFactorNode = props.GetScalarProperty("scaleFactor");
ExpressionNode progressAnimation = ExpressionFunctions.Clamp(-scrollingProperties.Translation.Y / clampSizeNode, 0, 1);
_props.StartAnimation("progress", progressAnimation);
ExpressionNode headerScaleAnimation = ExpressionFunctions.Lerp(1, 1.25f, ExpressionFunctions.Clamp(scrollingProperties.Translation.Y / 50, 0, 1));
ExpressionNode headerTranslationAnimation = ExpressionFunctions.Conditional(progressNode < 1, 0, -scrollingProperties.Translation.Y - clampSizeNode);
var headerVisual = this.ElementVisual();
headerVisual.CenterPoint = new Vector3((float)(this.ActualWidth / 2), (float)this.ActualHeight, 0);
headerVisual.StartAnimation("Scale.X", headerScaleAnimation);
headerVisual.StartAnimation("Scale.Y", headerScaleAnimation);
headerVisual.StartAnimation("Offset.Y", headerTranslationAnimation);
ExpressionNode primaryOpacityAnimation = 1 - progressNode;
PrimaryBackground.ElementVisual().StartAnimation("opacity", primaryOpacityAnimation);
ExpressionNode secondaryOpacityAnimation = progressNode;
SecondaryBackground.ElementVisual().StartAnimation("opacity", secondaryOpacityAnimation);
ExpressionNode scaleAnimation = ExpressionFunctions.Lerp(1, scaleFactorNode, progressNode);
ExpressionNode opacityAnimation = ExpressionFunctions.Clamp(1 - (progressNode * 2), 0, 1);
Visual autoSearchBoxVisual = SearchBox.ElementVisual();
autoSearchBoxVisual.CenterPoint = new Vector3((float)(SearchBox.ActualWidth / 2), (float)SearchBox.ActualHeight, 0);
autoSearchBoxVisual.StartAnimation("Scale.X", scaleAnimation);
autoSearchBoxVisual.StartAnimation("Scale.Y", scaleAnimation);
autoSearchBoxVisual.StartAnimation("Opacity", opacityAnimation);
Visual subMenuPanelVisual = SubMenuPanel.ElementVisual();
ExpressionNode contentOffsetAnimation = progressNode * 100;
subMenuPanelVisual.StartAnimation("Offset.Y", contentOffsetAnimation);
ExpressionNode searchBtnOpacityAnimation = ExpressionFunctions.Conditional(progressNode < 1, 0, 1);
Visual searchBtnVisual = ElementCompositionPreview.GetElementVisual(SearchBtn);
searchBtnVisual.StartAnimation("Opacity", searchBtnOpacityAnimation);
}
private void SamplePage_Loaded(object sender, Windows.UI.Xaml.RoutedEventArgs e)
{
// Get the PropertySet that contains the scroll values from MyScrollViewer
_scrollerPropertySet = ElementCompositionPreview.GetScrollViewerManipulationPropertySet(MyScrollviewer);
_compositor = _scrollerPropertySet.Compositor;
Model = new LocalDataSource();
gridView.ItemsSource = Model.AggregateDataSources(new ObservableCollection <Thumbnail>[] { Model.Landscapes, Model.Nature, Model.Abstract });
// Create a PropertySet that has values to be referenced in the ExpressionAnimations below
_props = _compositor.CreatePropertySet();
_props.InsertScalar("progress", 0);
_props.InsertScalar("clampSize", 150);
_props.InsertScalar("scaleFactor", 0.7f);
// Get references to our property sets for use with ExpressionNodes
var scrollingProperties = _scrollerPropertySet.GetSpecializedReference <ManipulationPropertySetReferenceNode>();
var props = _props.GetReference();
var progressNode = props.GetScalarProperty("progress");
var clampSizeNode = props.GetScalarProperty("clampSize");
var scaleFactorNode = props.GetScalarProperty("scaleFactor");
// Create a blur effect to be animated based on scroll position
var blurEffect = new GaussianBlurEffect()
{
Name = "blur",
BlurAmount = 0.0f,
BorderMode = EffectBorderMode.Hard,
Optimization = EffectOptimization.Balanced,
Source = new CompositionEffectSourceParameter("source")
};
var blurBrush = _compositor.CreateEffectFactory(
blurEffect,
new[] { "blur.BlurAmount" })
.CreateBrush();
blurBrush.SetSourceParameter("source", _compositor.CreateBackdropBrush());
// Create a Visual for applying the blur effect
_blurredBackgroundImageVisual = _compositor.CreateSpriteVisual();
_blurredBackgroundImageVisual.Brush = blurBrush;
_blurredBackgroundImageVisual.Size = new Vector2((float)OverlayRectangle.ActualWidth, (float)OverlayRectangle.ActualHeight);
// Insert the blur visual at the right point in the Visual Tree
ElementCompositionPreview.SetElementChildVisual(OverlayRectangle, _blurredBackgroundImageVisual);
// Create and start an ExpressionAnimation to track scroll progress over the desired distance
ExpressionNode progressAnimation = EF.Clamp(-scrollingProperties.Translation.Y / clampSizeNode, 0, 1);
_props.StartAnimation("progress", progressAnimation);
// Create and start an ExpressionAnimation to animate blur radius between 0 and 15 based on progress
ExpressionNode blurAnimation = EF.Lerp(0, 15, progressNode);
_blurredBackgroundImageVisual.Brush.Properties.StartAnimation("blur.BlurAmount", blurAnimation);
// Get the backing visual for the header so that its properties can be animated
Visual headerVisual = ElementCompositionPreview.GetElementVisual(Header);
// Create and start an ExpressionAnimation to clamp the header's offset to keep it onscreen
ExpressionNode headerTranslationAnimation = EF.Conditional(progressNode < 1, 0, -scrollingProperties.Translation.Y - clampSizeNode);
headerVisual.StartAnimation("Offset.Y", headerTranslationAnimation);
// Create and start an ExpressionAnimation to scale the header during overpan
ExpressionNode headerScaleAnimation = EF.Lerp(1, 1.25f, EF.Clamp(scrollingProperties.Translation.Y / 50, 0, 1));
headerVisual.StartAnimation("Scale.X", headerScaleAnimation);
headerVisual.StartAnimation("Scale.Y", headerScaleAnimation);
//Set the header's CenterPoint to ensure the overpan scale looks as desired
headerVisual.CenterPoint = new Vector3((float)(Header.ActualWidth / 2), (float)Header.ActualHeight, 0);
// Get the backing visual for the photo in the header so that its properties can be animated
Visual photoVisual = ElementCompositionPreview.GetElementVisual(BackgroundRectangle);
// Create and start an ExpressionAnimation to opacity fade out the image behind the header
ExpressionNode imageOpacityAnimation = 1 - progressNode;
photoVisual.StartAnimation("opacity", imageOpacityAnimation);
// Get the backing visual for the profile picture visual so that its properties can be animated
Visual profileVisual = ElementCompositionPreview.GetElementVisual(ProfileImage);
// Create and start an ExpressionAnimation to scale the profile image with scroll position
ExpressionNode scaleAnimation = EF.Lerp(1, scaleFactorNode, progressNode);
profileVisual.StartAnimation("Scale.X", scaleAnimation);
profileVisual.StartAnimation("Scale.Y", scaleAnimation);
// Get backing visuals for the text blocks so that their properties can be animated
Visual blurbVisual = ElementCompositionPreview.GetElementVisual(Blurb);
Visual subtitleVisual = ElementCompositionPreview.GetElementVisual(SubtitleBlock);
Visual moreVisual = ElementCompositionPreview.GetElementVisual(MoreText);
// Create an ExpressionAnimation that moves between 1 and 0 with scroll progress, to be used for text block opacity
ExpressionNode textOpacityAnimation = EF.Clamp(1 - (progressNode * 2), 0, 1);
// Start opacity and scale animations on the text block visuals
blurbVisual.StartAnimation("Opacity", textOpacityAnimation);
blurbVisual.StartAnimation("Scale.X", scaleAnimation);
blurbVisual.StartAnimation("Scale.Y", scaleAnimation);
subtitleVisual.StartAnimation("Opacity", textOpacityAnimation);
subtitleVisual.StartAnimation("Scale.X", scaleAnimation);
subtitleVisual.StartAnimation("Scale.Y", scaleAnimation);
moreVisual.StartAnimation("Opacity", textOpacityAnimation);
moreVisual.StartAnimation("Scale.X", scaleAnimation);
moreVisual.StartAnimation("Scale.Y", scaleAnimation);
// Get the backing visuals for the text and button containers so that their properites can be animated
Visual textVisual = ElementCompositionPreview.GetElementVisual(TextContainer);
Visual buttonVisual = ElementCompositionPreview.GetElementVisual(ButtonPanel);
// When the header stops scrolling it is 150 pixels offscreen. We want the text header to end up with 50 pixels of its content
// offscreen which means it needs to go from offset 0 to 100 as we traverse through the scrollable region
ExpressionNode contentOffsetAnimation = progressNode * 100;
textVisual.StartAnimation("Offset.Y", contentOffsetAnimation);
ExpressionNode buttonOffsetAnimation = progressNode * -100;
buttonVisual.StartAnimation("Offset.Y", buttonOffsetAnimation);
}
/// <summary>
/// Uses Composition API to get the UIElement and sets an ExpressionAnimation
/// The ExpressionAnimation uses the height of the UIElement to calculate an opacity value
/// for the Header as it is scrolling off-screen. The opacity reaches 0 when the Header
/// is entirely scrolled off.
/// </summary>
/// <returns><c>true</c> if the assignment was successful; otherwise, <c>false</c>.</returns>
private bool AssignAnimation()
{
StopAnimation();
if (AssociatedObject == null)
{
return(false);
}
if (_scrollViewer == null)
{
_scrollViewer = AssociatedObject as ScrollViewer ?? AssociatedObject.FindDescendant <ScrollViewer>();
}
if (_scrollViewer == null)
{
return(false);
}
var listView = AssociatedObject as ListViewBase ?? AssociatedObject.FindDescendant <ListViewBase>();
if (listView != null && listView.ItemsPanelRoot != null)
{
Canvas.SetZIndex(listView.ItemsPanelRoot, -1);
}
if (_scrollProperties == null)
{
_scrollProperties = ElementCompositionPreview.GetScrollViewerManipulationPropertySet(_scrollViewer);
}
if (_scrollProperties == null)
{
return(false);
}
// Implicit operation: Find the Header object of the control if it uses ListViewBase
if (HeaderElement == null && listView != null)
{
HeaderElement = listView.Header as UIElement;
}
var headerElement = HeaderElement as FrameworkElement;
if (headerElement == null || headerElement.RenderSize.Height == 0)
{
return(false);
}
if (_headerVisual == null)
{
_headerVisual = ElementCompositionPreview.GetElementVisual(headerElement);
}
if (_headerVisual == null)
{
return(false);
}
headerElement.SizeChanged -= ScrollHeader_SizeChanged;
headerElement.SizeChanged += ScrollHeader_SizeChanged;
_scrollViewer.GotFocus -= ScrollViewer_GotFocus;
_scrollViewer.GotFocus += ScrollViewer_GotFocus;
var compositor = _scrollProperties.Compositor;
if (_animationProperties == null)
{
_animationProperties = compositor.CreatePropertySet();
_animationProperties.InsertScalar("OffsetY", 0.0f);
}
var propSetOffset = _animationProperties.GetReference().GetScalarProperty("OffsetY");
var scrollPropSet = _scrollProperties.GetSpecializedReference <ManipulationPropertySetReferenceNode>();
var expressionAnimation = ExpressionFunctions.Max(propSetOffset - scrollPropSet.Translation.Y, 0);
_headerVisual.StartAnimation("Offset.Y", expressionAnimation);
// Mod: clip items panel below header
var itemsPanel = listView.ItemsPanelRoot;
if (itemsPanel == null)
{
return(true);
}
if (_itemsPanelVisual == null)
{
_itemsPanelVisual = ElementCompositionPreview.GetElementVisual(itemsPanel);
_contentClip = compositor.CreateInsetClip();
_itemsPanelVisual.Clip = _contentClip;
}
var expressionClipAnimation = ExpressionFunctions.Max(-scrollPropSet.Translation.Y, 0);
_contentClip.TopInset = (float)System.Math.Max(-_scrollViewer.VerticalOffset, 0);
_contentClip.StartAnimation("TopInset", expressionClipAnimation);
return(true);
}
private void MainInformationPage_Loaded(object sender, Windows.UI.Xaml.RoutedEventArgs e)
{
ApplicationViewTitleBar formattableTitleBar = ApplicationView.GetForCurrentView().TitleBar;
formattableTitleBar.ButtonBackgroundColor = Colors.Transparent;
formattableTitleBar.ButtonInactiveBackgroundColor = Colors.Transparent;
CoreApplicationViewTitleBar coreTitleBar = CoreApplication.GetCurrentView().TitleBar;
coreTitleBar.ExtendViewIntoTitleBar = true;
// Update the ZIndex of the header container so that the header is above the items when scrolling
Canvas.SetZIndex(Header, 1);
// Get the PropertySet that contains the scroll values from the ScrollViewer
_scrollerPropertySet = ElementCompositionPreview.GetScrollViewerManipulationPropertySet(scrollViewer);
_compositor = _scrollerPropertySet.Compositor;
// Create a PropertySet that has values to be referenced in the ExpressionAnimations below
_props = _compositor.CreatePropertySet();
_props.InsertScalar("progress", 0);
_props.InsertScalar("clampSize", 150);
_props.InsertScalar("scaleFactor", 0.7f);
// Get references to our property sets for use with ExpressionNodes
var scrollingProperties = _scrollerPropertySet.GetSpecializedReference <ManipulationPropertySetReferenceNode>();
var props = _props.GetReference();
var progressNode = props.GetScalarProperty("progress");
var clampSizeNode = props.GetScalarProperty("clampSize");
// Create and start an ExpressionAnimation to track scroll progress over the desired distance
ExpressionNode progressAnimation = ExpressionFunctions.Clamp(-scrollingProperties.Translation.Y / clampSizeNode, 0, 1);
_props.StartAnimation("progress", progressAnimation);
// Get the backing visual for the header so that its properties can be animated
headerVisual = ElementCompositionPreview.GetElementVisual(Header);
// Create and start an ExpressionAnimation to clamp the header's offset to keep it onscreen
ExpressionNode headerTranslationAnimation = ExpressionFunctions.Conditional(progressNode < 1, 0, -scrollingProperties.Translation.Y - clampSizeNode);
headerVisual.StartAnimation("Offset.Y", headerTranslationAnimation);
// Create and start an ExpressionAnimation to scale the header during overpan
ExpressionNode headerScaleAnimation = ExpressionFunctions.Lerp(1, 1.25f, ExpressionFunctions.Clamp(scrollingProperties.Translation.Y / 50, 0, 1));
headerVisual.StartAnimation("Scale.X", headerScaleAnimation);
headerVisual.StartAnimation("Scale.Y", headerScaleAnimation);
//Set the header's CenterPoint to ensure the overpan scale looks as desired
headerVisual.CenterPoint = new Vector3((float)(Header.ActualWidth / 2), (float)Header.ActualHeight, 0);
ExpressionNode OpacityAnimation = ExpressionFunctions.Clamp(1 - (progressNode * 2), 0, 1);
Visual profileVisual = ElementCompositionPreview.GetElementVisual(ProfileImage);
profileVisual.StartAnimation("Opacity", OpacityAnimation);
Visual subtitleVisual = ElementCompositionPreview.GetElementVisual(SubtitleBlock);
subtitleVisual.StartAnimation("Opacity", OpacityAnimation);
// Get the backing visuals for the text and button containers so that their properites can be animated
Visual buttonVisual = ElementCompositionPreview.GetElementVisual(ButtonPanel);
ExpressionNode buttonOffsetAnimation = progressNode * -14;
buttonVisual.StartAnimation("Offset.Y", buttonOffsetAnimation);
}
