CollectionView scrolling properties

[IeuanWalker]

I am trying to create a scrolldown indicator similar to what I have done for the scrollview -
https://github.com/user-attachments/assets/532c5f53-2cf8-437b-b961-6ce9a88645e3

For the scrollview it was pretty straightforward logic -

scrollView.Scrolled += async (_, e) =>
{
	double spaceAvailableForScrolling = scrollView.ContentSize.Height - scrollView.Height;

	if(spaceAvailableForScrolling < e.ScrollY + scrollDownIndicatorBuffer)
	{
		// Hide scroll
		await Task.WhenAll(
			control.Indicator.FadeTo(0, easing: Easing.CubicInOut),
			control.Indicator.TranslateTo(0, 50, easing: Easing.CubicInOut));

		control.Indicator.IsVisible = false;
	}
	else
	{
		// Show scroll
		control.Indicator.IsVisible = true;

		await Task.WhenAll(
			control.Indicator.FadeTo(1, easing: Easing.CubicIn),
			control.Indicator.TranslateTo(0, -10, easing: Easing.CubicInOut));
	}
};

But CollectionView doesn't seem to have the same properties, and the properties it does have doesn't seem to add up -

collectionView.Scrolled += async (_, e) =>
{
	double totalHeight = collectionView.Measure(double.PositiveInfinity, double.PositiveInfinity).Request.Height;
	double visibleHeight = collectionView.Height;
	double maxScrollOffset = totalHeight - visibleHeight;
	double currentScrollPosition = e.VerticalOffset;

	// Debug output
	System.Diagnostics.Debug.WriteLine($"Total Height: {totalHeight}, Visible Height: {visibleHeight}, Max Scroll Offset: {maxScrollOffset}, Current Scroll Position: {currentScrollPosition}");
};

which outputs (after scrolling to the bottom of the CollectionView)

 Total Height: 997.3333333333334, Visible Height: 512.6666666666666, Max Scroll Offset: 484.66666666666674, Current Scroll Position: 70.33333333333333

e.VerticalOffset never equals the maximum offset. My only thought is either e.VerticalOffset isn't calculated correctly, or the way I'm calculating the totalHeight is incorrect

---

All I'm trying to do is determine if there are items that are off the screen (below, to scroll down to), so if there is any way to determine that, any guidance would be great