https://www.mullenlowe-delta.com/wp-content/mu-plugins/wp-media-folder/assets/js/gif/spin.js?ver=1.0

1/**
2 * Copyright (c) 2011-2014 Felix Gnass
3 * Licensed under the MIT license
4 */
5(function (root, factory) {
6
7    /* CommonJS */
8    if (typeof exports == 'object') module.exports = factory()
9
10    /* AMD module */
11    else if (typeof define == 'function' && define.amd) define(factory)
12
13    /* Browser global */
14    else root.Spinner = factory()
15}
16(this, function () {
17    "use strict";
18
19    var prefixes = ['webkit', 'Moz', 'ms', 'O'] /* Vendor prefixes */
20        , animations = {} /* Animation rules keyed by their name */
21        , useCssAnimations
22
23    /* Whether to use CSS animations or setTimeout */
24
25    /**
26     * Utility function to create elements. If no tag name is given,
27     * a DIV is created. Optionally properties can be passed.
28     */
29    function createEl(tag, prop) {
30        var el = document.createElement(tag || 'div')
31            , n
32
33        for (n in prop) el[n] = prop[n]
34        return el
35    }
36
37    /**
38     * Appends children and returns the parent.
39     */
40    function ins(parent /* child1, child2, ...*/) {
41        for (var i = 1, n = arguments.length; i < n; i++)
42            parent.appendChild(arguments[i])
43
44        return parent
45    }
46
47    /**
48     * Insert a new stylesheet to hold the @keyframe or VML rules.
49     */
50    var sheet = (function () {
51        var el = createEl('style', {type: 'text/css'})
52        ins(document.getElementsByTagName('head')[0], el)
53        return el.sheet || el.styleSheet
54    }())
55
56    /**
57     * Creates an opacity keyframe animation rule and returns its name.
58     * Since most mobile Webkits have timing issues with animation-delay,
59     * we create separate rules for each line/segment.
60     */
61    function addAnimation(alpha, trail, i, lines) {
62        var name = ['opacity', trail, ~~(alpha * 100), i, lines].join('-')
63            , start = 0.01 + i / lines * 100
64            , z = Math.max(1 - (1 - alpha) / trail * (100 - start), alpha)
65            , prefix = useCssAnimations.substring(0, useCssAnimations.indexOf('Animation')).toLowerCase()
66            , pre = prefix && '-' + prefix + '-' || ''
67
68        if (!animations[name]) {
69            sheet.insertRule(
70                '@' + pre + 'keyframes ' + name + '{' +
71                '0%{opacity:' + z + '}' +
72                start + '%{opacity:' + alpha + '}' +
73                (start + 0.01) + '%{opacity:1}' +
74                (start + trail) % 100 + '%{opacity:' + alpha + '}' +
75                '100%{opacity:' + z + '}' +
76                '}', sheet.cssRules.length)
77
78            animations[name] = 1
79        }
80
81        return name
82    }
83
84    /**
85     * Tries various vendor prefixes and returns the first supported property.
86     */
87    function vendor(el, prop) {
88        var s = el.style
89            , pp
90            , i
91
92        prop = prop.charAt(0).toUpperCase() + prop.slice(1)
93        for (i = 0; i < prefixes.length; i++) {
94            pp = prefixes[i] + prop
95            if (s[pp] !== undefined) return pp
96        }
97        if (s[prop] !== undefined) return prop
98    }
99
100    /**
101     * Sets multiple style properties at once.
102     */
103    function css(el, prop) {
104        for (var n in prop)
105            el.style[vendor(el, n) || n] = prop[n]
106
107        return el
108    }
109
110    /**
111     * Fills in default values.
112     */
113    function merge(obj) {
114        for (var i = 1; i < arguments.length; i++) {
115            var def = arguments[i]
116            for (var n in def)
117                if (obj[n] === undefined) obj[n] = def[n]
118        }
119        return obj
120    }
121
122    /**
123     * Returns the absolute page-offset of the given element.
124     */
125    function pos(el) {
126        var o = {x: el.offsetLeft, y: el.offsetTop}
127        while ((el = el.offsetParent))
128            o.x += el.offsetLeft, o.y += el.offsetTop
129
130        return o
131    }
132
133    /**
134     * Returns the line color from the given string or array.
135     */
136    function getColor(color, idx) {
137        return typeof color == 'string' ? color : color[idx % color.length]
138    }
139
140    // Built-in defaults
141
142    var defaults = {
143        lines: 12,            // The number of lines to draw
144        length: 7,            // The length of each line
145        width: 5,             // The line thickness
146        radius: 10,           // The radius of the inner circle
147        rotate: 0,            // Rotation offset
148        corners: 1,           // Roundness (0..1)
149        color: '#000',        // #rgb or #rrggbb
150        direction: 1,         // 1: clockwise, -1: counterclockwise
151        speed: 1,             // Rounds per second
152        trail: 100,           // Afterglow percentage
153        opacity: 1 / 4,         // Opacity of the lines
154        fps: 20,              // Frames per second when using setTimeout()
155        zIndex: 2e9,          // Use a high z-index by default
156        className: 'spinner', // CSS class to assign to the element
157        top: '50%',           // center vertically
158        left: '50%',          // center horizontally
159        position: 'absolute'  // element position
160    }
161
162    /** The constructor */
163    function Spinner(o) {
164        this.opts = merge(o || {}, Spinner.defaults, defaults)
165    }
166
167    // Global defaults that override the built-ins:
168    Spinner.defaults = {}
169
170    merge(Spinner.prototype, {
171
172        /**
173         * Adds the spinner to the given target element. If this instance is already
174         * spinning, it is automatically removed from its previous target b calling
175         * stop() internally.
176         */
177        spin: function (target) {
178            this.stop()
179
180            var self = this
181                , o = self.opts
182                , el = self.el = css(createEl(0, {className: o.className}), {
183                position: o.position,
184                width: 0,
185                zIndex: o.zIndex
186            })
187                , mid = o.radius + o.length + o.width
188
189            css(el, {
190                left: o.left,
191                top: o.top
192            })
193
194            if (target) {
195                target.insertBefore(el, target.firstChild || null)
196            }
197
198            el.setAttribute('role', 'progressbar')
199            self.lines(el, self.opts)
200
201            if (!useCssAnimations) {
202                // No CSS animation support, use setTimeout() instead
203                var i = 0
204                    , start = (o.lines - 1) * (1 - o.direction) / 2
205                    , alpha
206                    , fps = o.fps
207                    , f = fps / o.speed
208                    , ostep = (1 - o.opacity) / (f * o.trail / 100)
209                    , astep = f / o.lines
210
211                ;(function anim() {
212                    i++;
213                    for (var j = 0; j < o.lines; j++) {
214                        alpha = Math.max(1 - (i + (o.lines - j) * astep) % f * ostep, o.opacity)
215
216                        self.opacity(el, j * o.direction + start, alpha, o)
217                    }
218                    self.timeout = self.el && setTimeout(anim, ~~(1000 / fps))
219                })()
220            }
221            return self
222        },
223
224        /**
225         * Stops and removes the Spinner.
226         */
227        stop: function () {
228            var el = this.el
229            if (el) {
230                clearTimeout(this.timeout)
231                if (el.parentNode) el.parentNode.removeChild(el)
232                this.el = undefined
233            }
234            return this
235        },
236
237        /**
238         * Internal method that draws the individual lines. Will be overwritten
239         * in VML fallback mode below.
240         */
241        lines: function (el, o) {
242            var i = 0
243                , start = (o.lines - 1) * (1 - o.direction) / 2
244                , seg
245
246            function fill(color, shadow) {
247                return css(createEl(), {
248                    position: 'absolute',
249                    width: (o.length + o.width) + 'px',
250                    height: o.width + 'px',
251                    background: color,
252                    boxShadow: shadow,
253                    transformOrigin: 'left',
254                    transform: 'rotate(' + ~~(360 / o.lines * i + o.rotate) + 'deg) translate(' + o.radius + 'px' + ',0)',
255                    borderRadius: (o.corners * o.width >> 1) + 'px'
256                })
257            }
258
259            for (; i < o.lines; i++) {
260                seg = css(createEl(), {
261                    position: 'absolute',
262                    top: 1 + ~(o.width / 2) + 'px',

263                    transform: o.hwaccel ? 'translate3d(0,0,0)' : '',
264                    opacity: o.opacity,
265                    animation: useCssAnimations && addAnimation(o.opacity, o.trail, start + i * o.direction, o.lines) + ' ' + 1 / o.speed + 's linear infinite'
266                })
267
268                if (o.shadow) ins(seg, css(fill('#000', '0 0 4px ' + '#000'), {top: 2 + 'px'}))
269                ins(el, ins(seg, fill(getColor(o.color, i), '0 0 1px rgba(0,0,0,.1)')))
270            }
271            return el
272        },
273
274        /**
275         * Internal method that adjusts the opacity of a single line.
276         * Will be overwritten in VML fallback mode below.
277         */
278        opacity: function (el, i, val) {
279            if (i < el.childNodes.length) el.childNodes[i].style.opacity = val
280        }
281
282    })
283
284
285    function initVML() {
286
287        /* Utility function to create a VML tag */
288        function vml(tag, attr) {
289            return createEl('<' + tag + ' xmlns="urn:schemas-microsoft.com:vml" class="spin-vml">', attr)
290        }
291
292        // No CSS transforms but VML support, add a CSS rule for VML elements:
293        sheet.addRule('.spin-vml', 'behavior:url(#default#VML)')
294
295        Spinner.prototype.lines = function (el, o) {
296            var r = o.length + o.width
297                , s = 2 * r
298
299            function grp() {
300                return css(
301                    vml('group', {
302                        coordsize: s + ' ' + s,
303                        coordorigin: -r + ' ' + -r
304                    }),
305                    {width: s, height: s}
306                )
307            }
308
309            var margin = -(o.width + o.length) * 2 + 'px'
310                , g = css(grp(), {position: 'absolute', top: margin, left: margin})
311                , i
312
313            function seg(i, dx, filter) {
314                ins(g,
315                    ins(css(grp(), {rotation: 360 / o.lines * i + 'deg', left: ~~dx}),
316                        ins(css(vml('roundrect', {arcsize: o.corners}), {
317                                width: r,
318                                height: o.width,
319                                left: o.radius,
320                                top: -o.width >> 1,
321                                filter: filter
322                            }),
323                            vml('fill', {color: getColor(o.color, i), opacity: o.opacity}),
324                            vml('stroke', {opacity: 0}) // transparent stroke to fix color bleeding upon opacity change
325                        )
326                    )
327                )
328            }
329
330            if (o.shadow)
331                for (i = 1; i <= o.lines; i++)
332                    seg(i, -2, 'progid:DXImageTransform.Microsoft.Blur(pixelradius=2,makeshadow=1,shadowopacity=.3)')
333
334            for (i = 1; i <= o.lines; i++) seg(i)
335            return ins(el, g)
336        }
337
338        Spinner.prototype.opacity = function (el, i, val, o) {
339            var c = el.firstChild
340            o = o.shadow && o.lines || 0
341            if (c && i + o < c.childNodes.length) {
342                c = c.childNodes[i + o];
343                c = c && c.firstChild;
344                c = c && c.firstChild
345                if (c) c.opacity = val
346            }
347        }
348    }
349
350    var probe = css(createEl('group'), {behavior: 'url(#default#VML)'})
351
352    if (!vendor(probe, 'transform') && probe.adj) initVML()
353    else useCssAnimations = vendor(probe, 'animation')
354
355    return Spinner
356
357}));