Reaching bottom of ScrollViewer - maximum VerticalOffset value is lower than ScrollableHeight

Question

I have problem with detecting when user reached the bottom of a ScrollViewer.

My Code:

bool atBottom = scrollViewer.VerticalOffset >= scrollViewer.ScrollableHeight;

But sometimes when I reached the bottom of Scrollviewer, value of scrollViewer.VerticalOffset is lower than scrollViewer.ScrollableHeight. It depends on items in listbox, but I dont know how.

Do you know, where is the problem?

Answer 1

You shouldn't use this approach to detect reaching the bottom of the scrollviewer. Instead you should use the Scroll states to detect this.

See http://blogs.msdn.com/b/slmperf/archive/2011/06/30/windows-phone-mango-change-listbox-how-to-detect-compression-end-of-scroll-states.aspx