public void Initialize(UIElement host, CompositionImage sourceElement, object payload) { _host = host; _parent = host; _payload = payload; // Make a copy of the sourceElement's sprite so we can hand it off to the next page SpriteVisual sourceSprite = sourceElement.SpriteVisual; Compositor compositor = sourceSprite.Compositor; _sprite = compositor.CreateSpriteVisual(); _sprite.Size = sourceSprite.Size; _sprite.Brush = sourceElement.SurfaceBrush; // We're going to use the backing surface, make sure it doesn't get released sourceElement.SharedSurface = true; // Determine the offset from the host to the source element used in the transition GeneralTransform coordinate = sourceElement.TransformToVisual(_parent); Point position = coordinate.TransformPoint(new Point(0, 0)); // Set the sprite to that offset relative to the host _sprite.Offset = new Vector3((float)position.X, (float)position.Y, 0); // Set the sprite as the content under the host ElementCompositionPreview.SetElementChildVisual(_parent, _sprite); }
public void Start(UIElement newParent, CompositionImage targetImage, ScrollViewer scrollViewer, UIElement animationTarget) { Visual transitionVisual = ElementCompositionPreview.GetElementChildVisual(_parent); ElementCompositionPreview.SetElementChildVisual(_parent, null); // // We need to reparent the transition visual under the new parent. This is important to ensure // it's propertly clipped, etc. // GeneralTransform coordinate = newParent.TransformToVisual(_parent); Point position = coordinate.TransformPoint(new Point(0, 0)); Vector3 currentOffset = transitionVisual.Offset; currentOffset.X -= (float)position.X; currentOffset.Y -= (float)position.Y; transitionVisual.Offset = currentOffset; _parent = newParent; _targetImage = targetImage; // Move the transition visual to it's new parent ElementCompositionPreview.SetElementChildVisual(_parent, transitionVisual); // Hide the target Image now since the handoff visual is still transitioning targetImage.Opacity = 0f; // Load image if necessary _imageLoaded = targetImage.IsContentLoaded; if (!_imageLoaded) { targetImage.ImageOpened += CompositionImage_ImageOpened; } // // Create a scoped batch around the animations. When the batch completes, we know the animations // have finished and we can cleanup the transition related objects. // Compositor compositor = transitionVisual.Compositor; _scopeBatch = compositor.CreateScopedBatch(CompositionBatchTypes.Animation); // // Determine the offset between the parent and the target UIElement. This will be used to calculate the // target position we are animating to. // coordinate = targetImage.TransformToVisual(_parent); position = coordinate.TransformPoint(new Point(0, 0)); TimeSpan totalDuration = TimeSpan.FromMilliseconds(1000); Vector3KeyFrameAnimation offsetAnimation = compositor.CreateVector3KeyFrameAnimation(); if (scrollViewer != null) { CompositionPropertySet scrollProperties = ElementCompositionPreview.GetScrollViewerManipulationPropertySet(scrollViewer); // Include the scroller offset as that is a factor position.X += scrollViewer.HorizontalOffset; position.Y += scrollViewer.VerticalOffset; // // Since the target position is relative to the target UIElement which can move, we need to construct // an expression to bind the target's position to the end position of our animation. // string expression = "Vector3(scrollingProperties.Translation.X, scrollingProperties.Translation.Y, 0) + itemOffset"; offsetAnimation.InsertExpressionKeyFrame(1f, expression); offsetAnimation.SetReferenceParameter("scrollingProperties", scrollProperties); offsetAnimation.SetVector3Parameter("itemOffset", new Vector3((float)position.X, (float)position.Y, 0)); offsetAnimation.Duration = totalDuration; } else { offsetAnimation.InsertKeyFrame(1, new Vector3((float)position.X, (float)position.Y, 0)); offsetAnimation.Duration = totalDuration; } // Create size animation to change size of the visual Vector2KeyFrameAnimation sizeAnimation = compositor.CreateVector2KeyFrameAnimation(); sizeAnimation.InsertKeyFrame(1f, new Vector2((float)targetImage.ActualWidth, (float)targetImage.ActualHeight)); sizeAnimation.Duration = totalDuration; // Create the fade in animation for the other page content if (animationTarget != null) { Visual fadeVisual = ElementCompositionPreview.GetElementVisual(animationTarget); ScalarKeyFrameAnimation fadeIn = compositor.CreateScalarKeyFrameAnimation(); fadeIn.InsertKeyFrame(0f, 0.0f); fadeIn.InsertKeyFrame(1f, 1.0f); fadeIn.Duration = totalDuration; fadeVisual.StartAnimation("Opacity", fadeIn); } //Start Animations _sprite.StartAnimation("Size", sizeAnimation); _sprite.StartAnimation("Offset", offsetAnimation); //Scoped batch completed event _scopeBatch.Completed += ScopeBatch_Completed; _scopeBatch.End(); // Clear the flag _animationCompleted = false; }