WPF context menu auto scroll

Question

I have a context menu in WPF with, say, 40 menu items. I limited the height of the context menu to, say "130" so that only five item appear at a time. It perfectly automatically assigned scrollviewer which a user can use to scroll the items. In the mean time, I need to capture ScrollChanged event so that I could remember the last scroll position and assign it later. ScrollViewer in

does not have anything I could use for that purpose

score 0 · Answer 1 · edited May 23 '17 at 12:33

You can check the VerticalOffset. The VerticalOffset property is between 0 and ScrollableHeight. Read more about it here.

private void OnScrollChanged(object sender, ScrollChangedEventArgs e)
{
   var scrollViewer = (ScrollViewer)sender;
   if (scrollViewer.VerticalOffset == 0)
          MessageBox.Show("This is the start.");
   else if (scrollViewer.VerticalOffset == scrollViewer.ScrollableHeight)
          MessageBox.Show("This is the end"); 
}

WPF context menu auto scroll

1 Answers1