protected override void Update(GameTime gameTime)
{
base.Update(gameTime);
if (Input.IsKeyReleased(Keys.D1))
{
scrollViewer.Content = grid;
}
if (Input.IsKeyReleased(Keys.D2))
{
scrollViewer.Content = stackPanel;
}
if (Input.IsKeyReleased(Keys.NumPad4))
{
scrollViewer.ScrollToBeginning(Orientation.Horizontal);
}
if (Input.IsKeyReleased(Keys.NumPad6))
{
scrollViewer.ScrollToEnd(Orientation.Horizontal);
}
if (Input.IsKeyReleased(Keys.NumPad8))
{
scrollViewer.ScrollToBeginning(Orientation.Vertical);
}
if (Input.IsKeyReleased(Keys.NumPad2))
{
scrollViewer.ScrollToEnd(Orientation.Vertical);
}
if (Input.IsKeyReleased(Keys.V))
{
scrollViewer.ScrollMode = ScrollingMode.Vertical;
}
if (Input.IsKeyReleased(Keys.H))
{
scrollViewer.ScrollMode = ScrollingMode.Horizontal;
}
if (Input.IsKeyReleased(Keys.B))
{
scrollViewer.ScrollMode = ScrollingMode.HorizontalVertical;
}
if (Input.IsKeyReleased(Keys.Space)) // check that scroll offsets are correctly updated when content gets smaller (and we are at the end of document)
{
grid.Height = float.IsNaN(grid.Height) ? 100 : float.NaN;
}
if (Input.IsKeyReleased(Keys.Enter)) // check that scrolling works even when IsArrange is false (try this when ScrollMode is in Horizontal mode)
{
grid.Height = 1000;
scrollViewer.ScrollMode = ScrollingMode.Vertical;
scrollViewer.ScrollToEnd(Orientation.Vertical);
}
}
public void TestScrolling()
{
const float elementWidth = 100;
const float elementHeight = 200;
const float elementDepth = 300;
var rand = new Random();
var scrollViewer = new ScrollViewer {
ScrollMode = ScrollingMode.HorizontalVertical, Width = elementWidth, Height = elementHeight, Depth = elementDepth
};
scrollViewer.Measure(Vector3.Zero);
scrollViewer.Arrange(Vector3.Zero, false);
// tests that no crashes happen with no content
scrollViewer.ScrollTo(rand.NextVector3());
Assert.AreEqual(Vector3.Zero, ScrollPosition);
scrollViewer.ScrollOf(rand.NextVector3());
Assert.AreEqual(Vector3.Zero, ScrollPosition);
scrollViewer.ScrollToBeginning(Orientation.Horizontal);
Assert.AreEqual(Vector3.Zero, ScrollPosition);
scrollViewer.ScrollToBeginning(Orientation.InDepth);
Assert.AreEqual(Vector3.Zero, ScrollPosition);
scrollViewer.ScrollToEnd(Orientation.Horizontal);
Assert.AreEqual(Vector3.Zero, ScrollPosition);
scrollViewer.ScrollToEnd(Orientation.InDepth);
Assert.AreEqual(Vector3.Zero, ScrollPosition);
// tests with an arranged element
const float contentWidth = 1000;
const float contentHeight = 2000;
const float contentDepth = 3000;
var content = new ContentDecorator {
Width = contentWidth, Height = contentHeight, Depth = contentDepth
};
scrollViewer.Content = content;
scrollViewer.Measure(Vector3.Zero);
scrollViewer.Arrange(Vector3.Zero, false);
var scrollValue = new Vector3(123, 456, 789);
scrollViewer.ScrollTo(scrollValue);
Assert.AreEqual(new Vector3(scrollValue.X, scrollValue.Y, 0), scrollViewer.ScrollPosition);
scrollViewer.ScrollToEnd(Orientation.Horizontal);
Assert.AreEqual(new Vector3(contentWidth - elementWidth, scrollValue.Y, 0), scrollViewer.ScrollPosition);
scrollViewer.ScrollToEnd(Orientation.Vertical);
Assert.AreEqual(new Vector3(contentWidth - elementWidth, contentHeight - elementHeight, 0), scrollViewer.ScrollPosition);
scrollViewer.ScrollToEnd(Orientation.InDepth);
Assert.AreEqual(new Vector3(contentWidth - elementWidth, contentHeight - elementHeight, 0), scrollViewer.ScrollPosition);
scrollViewer.ScrollToBeginning(Orientation.Horizontal);
Assert.AreEqual(new Vector3(0, contentHeight - elementHeight, 0), scrollViewer.ScrollPosition);
scrollViewer.ScrollToBeginning(Orientation.Vertical);
Assert.AreEqual(new Vector3(0, 0, 0), scrollViewer.ScrollPosition);
scrollViewer.ScrollToBeginning(Orientation.InDepth);
Assert.AreEqual(new Vector3(0, 0, 0), scrollViewer.ScrollPosition);
scrollViewer.ScrollOf(scrollValue);
Assert.AreEqual(new Vector3(scrollValue.X, scrollValue.Y, 0), scrollViewer.ScrollPosition);
// tests with an not arranged element
content.InvalidateArrange();
scrollViewer.ScrollTo(scrollValue);
scrollViewer.Arrange(Vector3.Zero, false);
Assert.AreEqual(new Vector3(scrollValue.X, scrollValue.Y, 0), scrollViewer.ScrollPosition);
content.InvalidateArrange();
scrollViewer.ScrollOf(2 * scrollValue);
scrollViewer.ScrollTo(scrollValue);
scrollViewer.Arrange(Vector3.Zero, false);
Assert.AreEqual(new Vector3(scrollValue.X, scrollValue.Y, 0), scrollViewer.ScrollPosition);
content.InvalidateArrange();
scrollViewer.ScrollToEnd(Orientation.Horizontal);
scrollViewer.ScrollToEnd(Orientation.Vertical);
scrollViewer.ScrollToEnd(Orientation.InDepth);
scrollViewer.Arrange(Vector3.Zero, false);
Assert.AreEqual(new Vector3(contentWidth - elementWidth, contentHeight - elementHeight, 0), scrollViewer.ScrollPosition);
content.InvalidateArrange();
scrollViewer.ScrollToBeginning(Orientation.Horizontal);
scrollViewer.ScrollToBeginning(Orientation.Vertical);
scrollViewer.ScrollToBeginning(Orientation.InDepth);
scrollViewer.Arrange(Vector3.Zero, false);
Assert.AreEqual(new Vector3(0, 0, 0), scrollViewer.ScrollPosition);
content.InvalidateArrange();
scrollViewer.ScrollOf(scrollValue);
scrollViewer.Arrange(Vector3.Zero, false);
Assert.AreEqual(new Vector3(scrollValue.X, scrollValue.Y, 0), scrollViewer.ScrollPosition);
content.InvalidateArrange();
scrollViewer.ScrollToBeginning(Orientation.Horizontal);
scrollViewer.ScrollToBeginning(Orientation.Vertical);
scrollViewer.ScrollToBeginning(Orientation.InDepth);
scrollViewer.ScrollOf(scrollValue);
scrollViewer.ScrollOf(scrollValue);
scrollViewer.Arrange(Vector3.Zero, false);
Assert.AreEqual(new Vector3(2 * scrollValue.X, 2 * scrollValue.Y, 0), scrollViewer.ScrollPosition);
}
public void TestScrolling()
{
const float elementWidth = 100;
const float elementHeight = 200;
const float elementDepth = 300;
var rand = new Random();
var scrollViewer = new ScrollViewer { ScrollMode = ScrollingMode.HorizontalVertical, Width = elementWidth, Height = elementHeight, Depth = elementDepth };
scrollViewer.Measure(Vector3.Zero);
scrollViewer.Arrange(Vector3.Zero, false);
// tests that no crashes happen with no content
scrollViewer.ScrollTo(rand.NextVector3());
Assert.AreEqual(Vector3.Zero, ScrollPosition);
scrollViewer.ScrollOf(rand.NextVector3());
Assert.AreEqual(Vector3.Zero, ScrollPosition);
scrollViewer.ScrollToBeginning(Orientation.Horizontal);
Assert.AreEqual(Vector3.Zero, ScrollPosition);
scrollViewer.ScrollToBeginning(Orientation.InDepth);
Assert.AreEqual(Vector3.Zero, ScrollPosition);
scrollViewer.ScrollToEnd(Orientation.Horizontal);
Assert.AreEqual(Vector3.Zero, ScrollPosition);
scrollViewer.ScrollToEnd(Orientation.InDepth);
Assert.AreEqual(Vector3.Zero, ScrollPosition);
// tests with an arranged element
const float contentWidth = 1000;
const float contentHeight = 2000;
const float contentDepth = 3000;
var content = new ContentDecorator { Width = contentWidth, Height = contentHeight, Depth = contentDepth };
scrollViewer.Content = content;
scrollViewer.Measure(Vector3.Zero);
scrollViewer.Arrange(Vector3.Zero, false);
var scrollValue = new Vector3(123, 456, 789);
scrollViewer.ScrollTo(scrollValue);
Assert.AreEqual(new Vector3(scrollValue.X, scrollValue.Y, 0), scrollViewer.ScrollPosition);
scrollViewer.ScrollToEnd(Orientation.Horizontal);
Assert.AreEqual(new Vector3(contentWidth - elementWidth, scrollValue.Y, 0), scrollViewer.ScrollPosition);
scrollViewer.ScrollToEnd(Orientation.Vertical);
Assert.AreEqual(new Vector3(contentWidth - elementWidth, contentHeight - elementHeight, 0), scrollViewer.ScrollPosition);
scrollViewer.ScrollToEnd(Orientation.InDepth);
Assert.AreEqual(new Vector3(contentWidth - elementWidth, contentHeight - elementHeight, 0), scrollViewer.ScrollPosition);
scrollViewer.ScrollToBeginning(Orientation.Horizontal);
Assert.AreEqual(new Vector3(0, contentHeight - elementHeight, 0), scrollViewer.ScrollPosition);
scrollViewer.ScrollToBeginning(Orientation.Vertical);
Assert.AreEqual(new Vector3(0, 0, 0), scrollViewer.ScrollPosition);
scrollViewer.ScrollToBeginning(Orientation.InDepth);
Assert.AreEqual(new Vector3(0, 0, 0), scrollViewer.ScrollPosition);
scrollViewer.ScrollOf(scrollValue);
Assert.AreEqual(new Vector3(scrollValue.X, scrollValue.Y, 0), scrollViewer.ScrollPosition);
// tests with an not arranged element
content.InvalidateArrange();
scrollViewer.ScrollTo(scrollValue);
scrollViewer.Arrange(Vector3.Zero, false);
Assert.AreEqual(new Vector3(scrollValue.X, scrollValue.Y, 0), scrollViewer.ScrollPosition);
content.InvalidateArrange();
scrollViewer.ScrollOf(2*scrollValue);
scrollViewer.ScrollTo(scrollValue);
scrollViewer.Arrange(Vector3.Zero, false);
Assert.AreEqual(new Vector3(scrollValue.X, scrollValue.Y, 0), scrollViewer.ScrollPosition);
content.InvalidateArrange();
scrollViewer.ScrollToEnd(Orientation.Horizontal);
scrollViewer.ScrollToEnd(Orientation.Vertical);
scrollViewer.ScrollToEnd(Orientation.InDepth);
scrollViewer.Arrange(Vector3.Zero, false);
Assert.AreEqual(new Vector3(contentWidth - elementWidth, contentHeight - elementHeight, 0), scrollViewer.ScrollPosition);
content.InvalidateArrange();
scrollViewer.ScrollToBeginning(Orientation.Horizontal);
scrollViewer.ScrollToBeginning(Orientation.Vertical);
scrollViewer.ScrollToBeginning(Orientation.InDepth);
scrollViewer.Arrange(Vector3.Zero, false);
Assert.AreEqual(new Vector3(0, 0, 0), scrollViewer.ScrollPosition);
content.InvalidateArrange();
scrollViewer.ScrollOf(scrollValue);
scrollViewer.Arrange(Vector3.Zero, false);
Assert.AreEqual(new Vector3(scrollValue.X, scrollValue.Y, 0), scrollViewer.ScrollPosition);
content.InvalidateArrange();
scrollViewer.ScrollToBeginning(Orientation.Horizontal);
scrollViewer.ScrollToBeginning(Orientation.Vertical);
scrollViewer.ScrollToBeginning(Orientation.InDepth);
scrollViewer.ScrollOf(scrollValue);
scrollViewer.ScrollOf(scrollValue);
scrollViewer.Arrange(Vector3.Zero, false);
Assert.AreEqual(new Vector3(2*scrollValue.X, 2*scrollValue.Y, 0), scrollViewer.ScrollPosition);
}
