downscroller.coffee

## Puts a big annoying arrow in your window when you're not scrolled down, like a dummy
#

scrollAlert = $("<div style='position: fixed; z-index: 10000; bottom: -10px; left: 10px; font-size: 10em; opacity: 0.5'>⬇</div>")
count = $("<div style='position: fixed; z-index: 10000; bottom: -50px; left: 50px; color: #fff'></div>")
lineCount = 0
showing = false

body = $ document.body
win = $ window
doc = $ document

show = ->
  return if showing
  scrollAlert.appendTo(body).fadeIn()
  count.html(lineCount).appendTo(body).fadeIn()
  showing = true

remove = ->
  return unless showing
  scrollAlert.fadeOut -> scrollAlert.remove()
  count.fadeOut -> count.remove()
  lineCount = 0
  showing = false

checkBottom = ->
  atBottom = win.scrollTop() + win.height() >= doc.height()
  if atBottom then hide() else show()

onNewLine = ->
  lineCount++
  checkBottom()

$(window).scroll checkbottom
bind 'line', onNewLine