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@Tether ?= {modules: []}
getScrollParent = (el) ->
position = getComputedStyle(el).position
if position is 'fixed'
return el
scrollParent = undefined
parent = el
while parent = parent.parentNode
try
style = getComputedStyle parent
return parent if not style?
if /(auto|scroll)/.test(style['overflow'] + style['overflow-y'] + style['overflow-x'])
if position isnt 'absolute' or style['position'] in ['relative', 'absolute', 'fixed']
return parent
return document.body
uniqueId = do ->
id = 0
->
id++
zeroPosCache = {}
getOrigin = (doc) ->
# getBoundingClientRect is unfortunately too accurate. It introduces a pixel or two of
# jitter as the user scrolls that messes with our ability to detect if two positions
# are equivilant or not. We place an element at the top left of the page that will
# get the same jitter, so we can cancel the two out.
node = doc._tetherZeroElement
if not node?
node = doc.createElement 'div'
node.setAttribute 'data-tether-id', uniqueId()
extend node.style,
top: 0
left: 0
position: 'absolute'
doc.body.appendChild node
doc._tetherZeroElement = node
id = node.getAttribute 'data-tether-id'
if not zeroPosCache[id]?
zeroPosCache[id] = {}
for k, v of node.getBoundingClientRect()
# Can't use extend, as on IE9, elements don't resolve to be hasOwnProperty
zeroPosCache[id][k] = v
# Clear the cache when this position call is done
defer ->
zeroPosCache[id] = undefined
return zeroPosCache[id]
node = null
getBounds = (el) ->
if el is document
doc = document
el = document.documentElement
else
doc = el.ownerDocument
docEl = doc.documentElement
box = {}
# The original object returned by getBoundingClientRect is immutable, so we clone it
# We can't use extend because the properties are not considered part of the object by hasOwnProperty in IE9
for k, v of el.getBoundingClientRect()
box[k] = v
origin = getOrigin doc
box.top -= origin.top
box.left -= origin.left
box.width ?= document.body.scrollWidth - box.left - box.right
box.height ?= document.body.scrollHeight - box.top - box.bottom
box.top = box.top - docEl.clientTop
box.left = box.left - docEl.clientLeft
box.right = doc.body.clientWidth - box.width - box.left
box.bottom = doc.body.clientHeight - box.height - box.top
box
getOffsetParent = (el) ->
el.offsetParent or document.documentElement
getScrollBarSize = ->
inner = document.createElement 'div'
inner.style.width = '100%'
inner.style.height = '200px'
outer = document.createElement 'div'
extend outer.style,
position: 'absolute'
top: 0
left: 0
pointerEvents: 'none'
visibility: 'hidden'
width: '200px'
height: '150px'
overflow: 'hidden'
outer.appendChild inner
document.body.appendChild outer
widthContained = inner.offsetWidth
outer.style.overflow = 'scroll'
widthScroll = inner.offsetWidth
if widthContained is widthScroll
widthScroll = outer.clientWidth
document.body.removeChild outer
width = widthContained - widthScroll
{width, height: width}
extend = (out={}) ->
args = []
Array::push.apply(args, arguments)
for obj in args[1..] when obj
for own key, val of obj
out[key] = val
out
removeClass = (el, name) ->
if el.classList?
el.classList.remove(cls) for cls in name.split(' ') when cls.trim()
else
el.className = el.className.replace new RegExp("(^| )#{ name.split(' ').join('|') }( |$)", 'gi'), ' '
addClass = (el, name) ->
if el.classList?
el.classList.add(cls) for cls in name.split(' ') when cls.trim()
else
removeClass el, name
el.className += " #{ name }"
hasClass = (el, name) ->
if el.classList?
el.classList.contains(name)
else
new RegExp("(^| )#{ name }( |$)", 'gi').test(el.className)
updateClasses = (el, add, all) ->
# Of the set of 'all' classes, we need the 'add' classes, and only the
# 'add' classes to be set.
for cls in all when cls not in add
if hasClass(el, cls)
removeClass el, cls
for cls in add
if not hasClass(el, cls)
addClass el, cls
deferred = []
defer = (fn) ->
deferred.push fn
flush = ->
fn() while fn = deferred.pop()
class Evented
on: (event, handler, ctx, once=false) ->
@bindings ?= {}
@bindings[event] ?= []
@bindings[event].push {handler, ctx, once}
once: (event, handler, ctx) ->
@on(event, handler, ctx, true)
off: (event, handler) ->
return unless @bindings?[event]?
if not handler?
delete @bindings[event]
else
i = 0
while i < @bindings[event].length
if @bindings[event][i].handler is handler
@bindings[event].splice i, 1
else
i++
trigger: (event, args...) ->
if @bindings?[event]
i = 0
while i < @bindings[event].length
{handler, ctx, once} = @bindings[event][i]
handler.apply(ctx ? @, args)
if once
@bindings[event].splice i, 1
else
i++
@Tether.Utils = {getScrollParent, getBounds, getOffsetParent, extend, addClass, removeClass, hasClass, updateClasses, defer, flush, uniqueId, Evented, getScrollBarSize}
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