1 var prefix = '', eventPrefix, endEventName, endAnimationName,
 2 vendors = { Webkit: 'webkit', Moz: '', O: 'o', ms: 'MS' },
 3 document = window.document, testEl = document.createElement('div'),
 4 supportedTransforms = /^((translate|rotate|scale)(X|Y|Z|3d)?|matrix(3d)?|perspective|skew(X|Y)?)$/i,
 5 transform,
 6 transitionProperty, transitionDuration, transitionTiming,
 7 animationName, animationDuration, animationTiming,
 8 cssReset = {}
 9
10 function dasherize(str) { return downcase(str.replace(/([a-z])([A-Z])/, '$1-$2')) }
11 function downcase(str) { return str.toLowerCase() }
12 function normalizeEvent(name) { return eventPrefix ? eventPrefix + name : downcase(name) }
13
14 $.each(vendors, function (vendor, event) {
15     if (testEl.style[vendor + 'TransitionProperty'] !== undefined) {
16         prefix = '-' + downcase(vendor) + '-'
17         eventPrefix = event
18         return false
19     }
20 })
21
22 transform = prefix + 'transform'
23 cssReset[transitionProperty = prefix + 'transition-property'] =
24 cssReset[transitionDuration = prefix + 'transition-duration'] =
25 cssReset[transitionTiming = prefix + 'transition-timing-function'] =
26 cssReset[animationName = prefix + 'animation-name'] =
27 cssReset[animationDuration = prefix + 'animation-duration'] =
28 cssReset[animationTiming = prefix + 'animation-timing-function'] = ''
29
30 $.fx = {
31     off: (eventPrefix === undefined && testEl.style.transitionProperty === undefined),
32     speeds: { _default: 400, fast: 200, slow: 600 },
33     cssPrefix: prefix,
34     transitionEnd: normalizeEvent('TransitionEnd'),
35     animationEnd: normalizeEvent('AnimationEnd')
36 }
37
38 $.fn.animate = function (properties, duration, ease, callback) {
39     if ($.isPlainObject(duration))
40         ease = duration.easing, callback = duration.complete, duration = duration.duration
41     if (duration) duration = (typeof duration == 'number' ? duration :
42                 ($.fx.speeds[duration] || $.fx.speeds._default)) / 1000
43     return this.anim(properties, duration, ease, callback)
44 }
45
46 $.fn.anim = function (properties, duration, ease, callback) {
47     var key, cssValues = {}, cssProperties, transforms = '',
48     that = this, wrappedCallback, endEvent = $.fx.transitionEnd
49
50     if (duration === undefined) duration = 0.4
51     if ($.fx.off) duration = 0
52
53     if (typeof properties == 'string') {
54         // keyframe animation
55         cssValues[animationName] = properties
56         cssValues[animationDuration] = duration + 's'
57         cssValues[animationTiming] = (ease || 'linear')
58         endEvent = $.fx.animationEnd
59     } else {
60         cssProperties = []
61         // CSS transitions
62         for (key in properties)
63             if (supportedTransforms.test(key)) transforms += key + '(' + properties[key] + ') '
64             else cssValues[key] = properties[key], cssProperties.push(dasherize(key))
65
66         if (transforms) cssValues[transform] = transforms, cssProperties.push(transform)
67         if (duration > 0 && typeof properties === 'object') {
68             cssValues[transitionProperty] = cssProperties.join(', ')
69             cssValues[transitionDuration] = duration + 's'
70             cssValues[transitionTiming] = (ease || 'linear')
71         }
72     }
73
74     wrappedCallback = function (event) {
75         if (typeof event !== 'undefined') {
76             if (event.target !== event.currentTarget) return // makes sure the event didn't bubble from "below"
77             $(event.target).unbind(endEvent, wrappedCallback)
78         }
79         $(this).css(cssReset)
80         callback && callback.call(this)
81     }
82     if (duration > 0) this.bind(endEvent, wrappedCallback)
83
84     // trigger page reflow so new elements can animate
85     this.size() && this.get(0).clientLeft
86
87     this.css(cssValues)
88
89     if (duration <= 0) setTimeout(function () {
90         that.each(function () { wrappedCallback.call(this) })
91     }, 0)
92
93     return this
94 }