get-event-type

Returns the type of the event, one of the following:

• 'top -- user clicked a scroll-to-top button
• 'bottom -- user clicked a scroll-to-bottom button
• 'line-up -- user clicked an arrow to scroll up or left one step
• 'line-down -- user clicked an arrow to scroll down or right one step
• 'page-up -- user clicked an arrow to scroll up or left one page
• 'page-down -- user clicked an arrow to scroll down or right one page
• 'thumb -- user dragged the scroll position indicator

• (send a-scroll-event get-event-type) -> symbol in '(top bottom line-up line-down page-up page-down thumb)