public void TestSurroudingAnchor(bool virtualizeItems) { var stackSize = new Vector3(100, 200, 300); var childSize1 = new Vector3(50, 150, 250); var childSize2 = new Vector3(150, 250, 350); var childSize3 = new Vector3(250, 250, 350); var stackPanel = new StackPanel { Size = stackSize, ItemVirtualizationEnabled = virtualizeItems, Orientation = Orientation.Horizontal }; var child1 = new StackPanel { Size = childSize1 }; var child2 = new StackPanel { Size = childSize2 }; var child3 = new StackPanel { Size = childSize3 }; stackPanel.Children.Add(child1); stackPanel.Children.Add(child2); stackPanel.Children.Add(child3); stackPanel.Arrange(Vector3.Zero, false); // checks in the scrolling direction stackPanel.ScrollToBeginning(Orientation.Horizontal); Utilities.AssertAreNearlyEqual(new Vector2(0, 50), stackPanel.GetSurroudingAnchorDistances(Orientation.Horizontal, 0)); stackPanel.ScrolllToElement(0.5f); Utilities.AssertAreNearlyEqual(new Vector2(-25, 25), stackPanel.GetSurroudingAnchorDistances(Orientation.Horizontal, 0)); stackPanel.ScrolllToElement(1f); Utilities.AssertAreNearlyEqual(new Vector2(0, 150), stackPanel.GetSurroudingAnchorDistances(Orientation.Horizontal, 0)); stackPanel.ScrolllToElement(2 + 3/5f); Utilities.AssertAreNearlyEqual(new Vector2(-150, 100), stackPanel.GetSurroudingAnchorDistances(Orientation.Horizontal, 0)); stackPanel.ScrollToEnd(Orientation.Horizontal); Utilities.AssertAreNearlyEqual(new Vector2(-150, 100), stackPanel.GetSurroudingAnchorDistances(Orientation.Horizontal, 0)); // checks in other directions Assert.AreEqual(new Vector2(0, 200), stackPanel.GetSurroudingAnchorDistances(Orientation.Vertical, -1)); Assert.AreEqual(new Vector2(-100, 100), stackPanel.GetSurroudingAnchorDistances(Orientation.Vertical, 100)); Assert.AreEqual(new Vector2(-200, 0), stackPanel.GetSurroudingAnchorDistances(Orientation.Vertical, 500)); Assert.AreEqual(new Vector2(0, 300), stackPanel.GetSurroudingAnchorDistances(Orientation.InDepth, -1)); Assert.AreEqual(new Vector2(-150, 150), stackPanel.GetSurroudingAnchorDistances(Orientation.InDepth, 150)); Assert.AreEqual(new Vector2(-300, 0), stackPanel.GetSurroudingAnchorDistances(Orientation.InDepth, 500)); }