Elements do not update when underlying view is scrolled

[mjrusso]

If the focused window in the frontmost app has a scroll view, and you pull up Scoot (in element-based nav mode), and then start scrolling, the regions that Scoot has drawn won't update.

There are (at least) two ways to scroll:

• using Scoot's keyboard shortcuts for scrolling, or
• using your physical mouse or trackpad)

For the latter case, are there any accessibility-related hooks in MacOS to detect if the user is scrolling?

Originally posted by @mjrusso in #1 (comment)

[mjrusso]

I did some (very quick) research, and it looks like https://github.com/pilotmoon/Scroll-Reverser might use some of the Carbon hooks we need to detect scrolling. (Note to self: take a closer look at https://github.com/pilotmoon/Scroll-Reverser/blob/master/MouseTap.m)

[mjrusso]

This code is enough to know when the user scrolled:

NSEvent.addGlobalMonitorForEvents(matching: .scrollWheel) { _ in
  print("global mouse scroll")
}

Can also listen for local events, but this is less relevant for this particular use case:

NSEvent.addLocalMonitorForEvents(matching: [.scrollWheel]) { event in
  print("local mouse scroll")
  return event
}

For the global monitor in particular, for system performance reasons, we'll want to make sure that it is only registered while element-based nav is actually active.