https://www.mad4one.com/js/vendor/spin.js

1//fgnass.github.com/spin.js#v1.3
2
3/*!
4 * Copyright (c) 2011-2013 Felix Gnass
5 * Licensed under the MIT license
6 */
7(function(root, factory) {
8
9  /* CommonJS */
10  if (typeof exports == 'object')  module.exports = factory()
11
12  /* AMD module */
13  else if (typeof define == 'function' && define.amd) define(factory)
14
15  /* Browser global */
16  else root.Spinner = factory()
17}
18(this, function() {
19  "use strict";
20
21  var prefixes = ['webkit', 'Moz', 'ms', 'O'] /* Vendor prefixes */
22    , animations = {} /* Animation rules keyed by their name */
23    , useCssAnimations /* 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    if(s[prop] !== undefined) return prop
93    prop = prop.charAt(0).toUpperCase() + prop.slice(1)
94    for(i=0; i<prefixes.length; i++) {

95      pp = prefixes[i]+prop
96      if(s[pp] !== undefined) return pp
97    }
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  // Built-in defaults
134
135  var defaults = {
136    lines: 12,            // The number of lines to draw
137    length: 7,            // The length of each line
138    width: 5,             // The line thickness
139    radius: 10,           // The radius of the inner circle
140    rotate: 0,            // Rotation offset
141    corners: 1,           // Roundness (0..1)
142    color: '#000',        // #rgb or #rrggbb
143    direction: 1,         // 1: clockwise, -1: counterclockwise
144    speed: 1,             // Rounds per second
145    trail: 100,           // Afterglow percentage
146    opacity: 1/4,         // Opacity of the lines
147    fps: 20,              // Frames per second when using setTimeout()
148    zIndex: 2e9,          // Use a high z-index by default
149    className: 'spinner', // CSS class to assign to the element
150    top: 'auto',          // center vertically
151    left: 'auto',         // center horizontally
152    position: 'relative'  // element position
153  }
154
155  /** The constructor */
156  function Spinner(o) {
157    if (typeof this == 'undefined') return new Spinner(o)
158    this.opts = merge(o || {}, Spinner.defaults, defaults)
159  }
160
161  // Global defaults that override the built-ins:
162  Spinner.defaults = {}
163
164  merge(Spinner.prototype, {
165
166    /**
167     * Adds the spinner to the given target element. If this instance is already
168     * spinning, it is automatically removed from its previous target b calling
169     * stop() internally.
170     */
171    spin: function(target) {
172      this.stop()
173
174      var self = this
175        , o = self.opts
176        , el = self.el = css(createEl(0, {className: o.className}), {position: o.position, width: 0, zIndex: o.zIndex})
177        , mid = o.radius+o.length+o.width
178        , ep // element position
179        , tp // target position
180
181      if (target) {
182        target.insertBefore(el, target.firstChild||null)
183        tp = pos(target)
184        ep = pos(el)
185        css(el, {
186          left: (o.left == 'auto' ? tp.x-ep.x + (target.offsetWidth >> 1) : parseInt(o.left, 10) + mid) + 'px',
187          top: (o.top == 'auto' ? tp.y-ep.y + (target.offsetHeight >> 1) : parseInt(o.top, 10) + mid)  + 'px'
188        })
189      }
190
191      el.setAttribute('role', 'progressbar')
192      self.lines(el, self.opts)
193
194      if (!useCssAnimations) {
195        // No CSS animation support, use setTimeout() instead
196        var i = 0
197          , start = (o.lines - 1) * (1 - o.direction) / 2
198          , alpha
199          , fps = o.fps
200          , f = fps/o.speed
201          , ostep = (1-o.opacity) / (f*o.trail / 100)
202          , astep = f/o.lines
203
204        ;(function anim() {
205          i++;
206          for (var j = 0; j < o.lines; j++) {
207            alpha = Math.max(1 - (i + (o.lines - j) * astep) % f * ostep, o.opacity)
208
209            self.opacity(el, j * o.direction + start, alpha, o)
210          }
211          self.timeout = self.el && setTimeout(anim, ~~(1000/fps))
212        })()
213      }
214      return self
215    },
216
217    /**
218     * Stops and removes the Spinner.
219     */
220    stop: function() {
221      var el = this.el
222      if (el) {
223        clearTimeout(this.timeout)
224        if (el.parentNode) el.parentNode.removeChild(el)
225        this.el = undefined
226      }
227      return this
228    },
229
230    /**
231     * Internal method that draws the individual lines. Will be overwritten
232     * in VML fallback mode below.
233     */
234    lines: function(el, o) {
235      var i = 0
236        , start = (o.lines - 1) * (1 - o.direction) / 2
237        , seg
238
239      function fill(color, shadow) {
240        return css(createEl(), {
241          position: 'absolute',
242          width: (o.length+o.width) + 'px',
243          height: o.width + 'px',
244          background: color,
245          boxShadow: shadow,
246          transformOrigin: 'left',
247          transform: 'rotate(' + ~~(360/o.lines*i+o.rotate) + 'deg) translate(' + o.radius+'px' +',0)',
248          borderRadius: (o.corners * o.width>>1) + 'px'
249        })
250      }
251
252      for (; i < o.lines; i++) {
253        seg = css(createEl(), {
254          position: 'absolute',
255          top: 1+~(o.width/2) + 'px',

256          transform: o.hwaccel ? 'translate3d(0,0,0)' : '',
257          opacity: o.opacity,
258          animation: useCssAnimations && addAnimation(o.opacity, o.trail, start + i * o.direction, o.lines) + ' ' + 1/o.speed + 's linear infinite'
259        })
260
261        if (o.shadow) ins(seg, css(fill('#000', '0 0 4px ' + '#000'), {top: 2+'px'}))
262
263        ins(el, ins(seg, fill(o.color, '0 0 1px rgba(0,0,0,.1)')))
264      }
265      return el
266    },
267
268    /**
269     * Internal method that adjusts the opacity of a single line.
270     * Will be overwritten in VML fallback mode below.
271     */
272    opacity: function(el, i, val) {
273      if (i < el.childNodes.length) el.childNodes[i].style.opacity = val
274    }
275
276  })
277
278
279  function initVML() {
280
281    /* Utility function to create a VML tag */
282    function vml(tag, attr) {
283      return createEl('<' + tag + ' xmlns="urn:schemas-microsoft.com:vml" class="spin-vml">', attr)
284    }
285
286    // No CSS transforms but VML support, add a CSS rule for VML elements:
287    sheet.addRule('.spin-vml', 'behavior:url(#default#VML)')
288
289    Spinner.prototype.lines = function(el, o) {
290      var r = o.length+o.width
291        , s = 2*r
292
293      function grp() {
294        return css(
295          vml('group', {
296            coordsize: s + ' ' + s,
297            coordorigin: -r + ' ' + -r
298          }),
299          { width: s, height: s }
300        )
301      }
302
303      var margin = -(o.width+o.length)*2 + 'px'
304        , g = css(grp(), {position: 'absolute', top: margin, left: margin})
305        , i
306
307      function seg(i, dx, filter) {
308        ins(g,
309          ins(css(grp(), {rotation: 360 / o.lines * i + 'deg', left: ~~dx}),
310            ins(css(vml('roundrect', {arcsize: o.corners}), {
311                width: r,
312                height: o.width,
313                left: o.radius,
314                top: -o.width>>1,
315                filter: filter
316              }),
317              vml('fill', {color: o.color, opacity: o.opacity}),
318              vml('stroke', {opacity: 0}) // transparent stroke to fix color bleeding upon opacity change
319            )
320          )
321        )
322      }
323
324      if (o.shadow)
325        for (i = 1; i <= o.lines; i++)
326          seg(i, -2, 'progid:DXImageTransform.Microsoft.Blur(pixelradius=2,makeshadow=1,shadowopacity=.3)')
327
328      for (i = 1; i <= o.lines; i++) seg(i)
329      return ins(el, g)
330    }
331
332    Spinner.prototype.opacity = function(el, i, val, o) {
333      var c = el.firstChild
334      o = o.shadow && o.lines || 0
335      if (c && i+o < c.childNodes.length) {
336        c = c.childNodes[i+o]; c = c && c.firstChild; c = c && c.firstChild
337        if (c) c.opacity = val
338      }
339    }
340  }
341
342  var probe = css(createEl('group'), {behavior: 'url(#default#VML)'})
343
344  if (!vendor(probe, 'transform') && probe.adj) initVML()
345  else useCssAnimations = vendor(probe, 'animation')
346
347  return Spinner
348
349}));