terom@42: //fgnass.github.com/spin.js#v1.2.7
terom@42: !function(window, document, undefined) {
terom@42: 
terom@42:   /**
terom@42:    * Copyright (c) 2011 Felix Gnass [fgnass at neteye dot de]
terom@42:    * Licensed under the MIT license
terom@42:    */
terom@42: 
terom@42:   var prefixes = ['webkit', 'Moz', 'ms', 'O'] /* Vendor prefixes */
terom@42:     , animations = {} /* Animation rules keyed by their name */
terom@42:     , useCssAnimations
terom@42: 
terom@42:   /**
terom@42:    * Utility function to create elements. If no tag name is given,
terom@42:    * a DIV is created. Optionally properties can be passed.
terom@42:    */
terom@42:   function createEl(tag, prop) {
terom@42:     var el = document.createElement(tag || 'div')
terom@42:       , n
terom@42: 
terom@42:     for(n in prop) el[n] = prop[n]
terom@42:     return el
terom@42:   }
terom@42: 
terom@42:   /**
terom@42:    * Appends children and returns the parent.
terom@42:    */
terom@42:   function ins(parent /* child1, child2, ...*/) {
terom@42:     for (var i=1, n=arguments.length; i<n; i++)
terom@42:       parent.appendChild(arguments[i])
terom@42: 
terom@42:     return parent
terom@42:   }
terom@42: 
terom@42:   /**
terom@42:    * Insert a new stylesheet to hold the @keyframe or VML rules.
terom@42:    */
terom@42:   var sheet = function() {
terom@42:     var el = createEl('style', {type : 'text/css'})
terom@42:     ins(document.getElementsByTagName('head')[0], el)
terom@42:     return el.sheet || el.styleSheet
terom@42:   }()
terom@42: 
terom@42:   /**
terom@42:    * Creates an opacity keyframe animation rule and returns its name.
terom@42:    * Since most mobile Webkits have timing issues with animation-delay,
terom@42:    * we create separate rules for each line/segment.
terom@42:    */
terom@42:   function addAnimation(alpha, trail, i, lines) {
terom@42:     var name = ['opacity', trail, ~~(alpha*100), i, lines].join('-')
terom@42:       , start = 0.01 + i/lines*100
terom@42:       , z = Math.max(1 - (1-alpha) / trail * (100-start), alpha)
terom@42:       , prefix = useCssAnimations.substring(0, useCssAnimations.indexOf('Animation')).toLowerCase()
terom@42:       , pre = prefix && '-'+prefix+'-' || ''
terom@42: 
terom@42:     if (!animations[name]) {
terom@42:       sheet.insertRule(
terom@42:         '@' + pre + 'keyframes ' + name + '{' +
terom@42:         '0%{opacity:' + z + '}' +
terom@42:         start + '%{opacity:' + alpha + '}' +
terom@42:         (start+0.01) + '%{opacity:1}' +
terom@42:         (start+trail) % 100 + '%{opacity:' + alpha + '}' +
terom@42:         '100%{opacity:' + z + '}' +
terom@42:         '}', sheet.cssRules.length)
terom@42: 
terom@42:       animations[name] = 1
terom@42:     }
terom@42:     return name
terom@42:   }
terom@42: 
terom@42:   /**
terom@42:    * Tries various vendor prefixes and returns the first supported property.
terom@42:    **/
terom@42:   function vendor(el, prop) {
terom@42:     var s = el.style
terom@42:       , pp
terom@42:       , i
terom@42: 
terom@42:     if(s[prop] !== undefined) return prop
terom@42:     prop = prop.charAt(0).toUpperCase() + prop.slice(1)
terom@42:     for(i=0; i<prefixes.length; i++) {
terom@42:       pp = prefixes[i]+prop
terom@42:       if(s[pp] !== undefined) return pp
terom@42:     }
terom@42:   }
terom@42: 
terom@42:   /**
terom@42:    * Sets multiple style properties at once.
terom@42:    */
terom@42:   function css(el, prop) {
terom@42:     for (var n in prop)
terom@42:       el.style[vendor(el, n)||n] = prop[n]
terom@42: 
terom@42:     return el
terom@42:   }
terom@42: 
terom@42:   /**
terom@42:    * Fills in default values.
terom@42:    */
terom@42:   function merge(obj) {
terom@42:     for (var i=1; i < arguments.length; i++) {
terom@42:       var def = arguments[i]
terom@42:       for (var n in def)
terom@42:         if (obj[n] === undefined) obj[n] = def[n]
terom@42:     }
terom@42:     return obj
terom@42:   }
terom@42: 
terom@42:   /**
terom@42:    * Returns the absolute page-offset of the given element.
terom@42:    */
terom@42:   function pos(el) {
terom@42:     var o = { x:el.offsetLeft, y:el.offsetTop }
terom@42:     while((el = el.offsetParent))
terom@42:       o.x+=el.offsetLeft, o.y+=el.offsetTop
terom@42: 
terom@42:     return o
terom@42:   }
terom@42: 
terom@42:   var defaults = {
terom@42:     lines: 12,            // The number of lines to draw
terom@42:     length: 7,            // The length of each line
terom@42:     width: 5,             // The line thickness
terom@42:     radius: 10,           // The radius of the inner circle
terom@42:     rotate: 0,            // Rotation offset
terom@42:     corners: 1,           // Roundness (0..1)
terom@42:     color: '#000',        // #rgb or #rrggbb
terom@42:     speed: 1,             // Rounds per second
terom@42:     trail: 100,           // Afterglow percentage
terom@42:     opacity: 1/4,         // Opacity of the lines
terom@42:     fps: 20,              // Frames per second when using setTimeout()
terom@42:     zIndex: 2e9,          // Use a high z-index by default
terom@42:     className: 'spinner', // CSS class to assign to the element
terom@42:     top: 'auto',          // center vertically
terom@42:     left: 'auto',         // center horizontally
terom@42:     position: 'relative'  // element position
terom@42:   }
terom@42: 
terom@42:   /** The constructor */
terom@42:   var Spinner = function Spinner(o) {
terom@42:     if (!this.spin) return new Spinner(o)
terom@42:     this.opts = merge(o || {}, Spinner.defaults, defaults)
terom@42:   }
terom@42: 
terom@42:   Spinner.defaults = {}
terom@42: 
terom@42:   merge(Spinner.prototype, {
terom@42:     spin: function(target) {
terom@42:       this.stop()
terom@42:       var self = this
terom@42:         , o = self.opts
terom@42:         , el = self.el = css(createEl(0, {className: o.className}), {position: o.position, width: 0, zIndex: o.zIndex})
terom@42:         , mid = o.radius+o.length+o.width
terom@42:         , ep // element position
terom@42:         , tp // target position
terom@42: 
terom@42:       if (target) {
terom@42:         target.insertBefore(el, target.firstChild||null)
terom@42:         tp = pos(target)
terom@42:         ep = pos(el)
terom@42:         css(el, {
terom@42:           left: (o.left == 'auto' ? tp.x-ep.x + (target.offsetWidth >> 1) : parseInt(o.left, 10) + mid) + 'px',
terom@42:           top: (o.top == 'auto' ? tp.y-ep.y + (target.offsetHeight >> 1) : parseInt(o.top, 10) + mid)  + 'px'
terom@42:         })
terom@42:       }
terom@42: 
terom@42:       el.setAttribute('aria-role', 'progressbar')
terom@42:       self.lines(el, self.opts)
terom@42: 
terom@42:       if (!useCssAnimations) {
terom@42:         // No CSS animation support, use setTimeout() instead
terom@42:         var i = 0
terom@42:           , fps = o.fps
terom@42:           , f = fps/o.speed
terom@42:           , ostep = (1-o.opacity) / (f*o.trail / 100)
terom@42:           , astep = f/o.lines
terom@42: 
terom@42:         ;(function anim() {
terom@42:           i++;
terom@42:           for (var s=o.lines; s; s--) {
terom@42:             var alpha = Math.max(1-(i+s*astep)%f * ostep, o.opacity)
terom@42:             self.opacity(el, o.lines-s, alpha, o)
terom@42:           }
terom@42:           self.timeout = self.el && setTimeout(anim, ~~(1000/fps))
terom@42:         })()
terom@42:       }
terom@42:       return self
terom@42:     },
terom@42: 
terom@42:     stop: function() {
terom@42:       var el = this.el
terom@42:       if (el) {
terom@42:         clearTimeout(this.timeout)
terom@42:         if (el.parentNode) el.parentNode.removeChild(el)
terom@42:         this.el = undefined
terom@42:       }
terom@42:       return this
terom@42:     },
terom@42: 
terom@42:     lines: function(el, o) {
terom@42:       var i = 0
terom@42:         , seg
terom@42: 
terom@42:       function fill(color, shadow) {
terom@42:         return css(createEl(), {
terom@42:           position: 'absolute',
terom@42:           width: (o.length+o.width) + 'px',
terom@42:           height: o.width + 'px',
terom@42:           background: color,
terom@42:           boxShadow: shadow,
terom@42:           transformOrigin: 'left',
terom@42:           transform: 'rotate(' + ~~(360/o.lines*i+o.rotate) + 'deg) translate(' + o.radius+'px' +',0)',
terom@42:           borderRadius: (o.corners * o.width>>1) + 'px'
terom@42:         })
terom@42:       }
terom@42: 
terom@42:       for (; i < o.lines; i++) {
terom@42:         seg = css(createEl(), {
terom@42:           position: 'absolute',
terom@42:           top: 1+~(o.width/2) + 'px',
terom@42:           transform: o.hwaccel ? 'translate3d(0,0,0)' : '',
terom@42:           opacity: o.opacity,
terom@42:           animation: useCssAnimations && addAnimation(o.opacity, o.trail, i, o.lines) + ' ' + 1/o.speed + 's linear infinite'
terom@42:         })
terom@42: 
terom@42:         if (o.shadow) ins(seg, css(fill('#000', '0 0 4px ' + '#000'), {top: 2+'px'}))
terom@42: 
terom@42:         ins(el, ins(seg, fill(o.color, '0 0 1px rgba(0,0,0,.1)')))
terom@42:       }
terom@42:       return el
terom@42:     },
terom@42: 
terom@42:     opacity: function(el, i, val) {
terom@42:       if (i < el.childNodes.length) el.childNodes[i].style.opacity = val
terom@42:     }
terom@42: 
terom@42:   })
terom@42: 
terom@42:   /////////////////////////////////////////////////////////////////////////
terom@42:   // VML rendering for IE
terom@42:   /////////////////////////////////////////////////////////////////////////
terom@42: 
terom@42:   /**
terom@42:    * Check and init VML support
terom@42:    */
terom@42:   ;(function() {
terom@42: 
terom@42:     function vml(tag, attr) {
terom@42:       return createEl('<' + tag + ' xmlns="urn:schemas-microsoft.com:vml" class="spin-vml">', attr)
terom@42:     }
terom@42: 
terom@42:     var s = css(createEl('group'), {behavior: 'url(#default#VML)'})
terom@42: 
terom@42:     if (!vendor(s, 'transform') && s.adj) {
terom@42: 
terom@42:       // VML support detected. Insert CSS rule ...
terom@42:       sheet.addRule('.spin-vml', 'behavior:url(#default#VML)')
terom@42: 
terom@42:       Spinner.prototype.lines = function(el, o) {
terom@42:         var r = o.length+o.width
terom@42:           , s = 2*r
terom@42: 
terom@42:         function grp() {
terom@42:           return css(
terom@42:             vml('group', {
terom@42:               coordsize: s + ' ' + s,
terom@42:               coordorigin: -r + ' ' + -r
terom@42:             }),
terom@42:             { width: s, height: s }
terom@42:           )
terom@42:         }
terom@42: 
terom@42:         var margin = -(o.width+o.length)*2 + 'px'
terom@42:           , g = css(grp(), {position: 'absolute', top: margin, left: margin})
terom@42:           , i
terom@42: 
terom@42:         function seg(i, dx, filter) {
terom@42:           ins(g,
terom@42:             ins(css(grp(), {rotation: 360 / o.lines * i + 'deg', left: ~~dx}),
terom@42:               ins(css(vml('roundrect', {arcsize: o.corners}), {
terom@42:                   width: r,
terom@42:                   height: o.width,
terom@42:                   left: o.radius,
terom@42:                   top: -o.width>>1,
terom@42:                   filter: filter
terom@42:                 }),
terom@42:                 vml('fill', {color: o.color, opacity: o.opacity}),
terom@42:                 vml('stroke', {opacity: 0}) // transparent stroke to fix color bleeding upon opacity change
terom@42:               )
terom@42:             )
terom@42:           )
terom@42:         }
terom@42: 
terom@42:         if (o.shadow)
terom@42:           for (i = 1; i <= o.lines; i++)
terom@42:             seg(i, -2, 'progid:DXImageTransform.Microsoft.Blur(pixelradius=2,makeshadow=1,shadowopacity=.3)')
terom@42: 
terom@42:         for (i = 1; i <= o.lines; i++) seg(i)
terom@42:         return ins(el, g)
terom@42:       }
terom@42: 
terom@42:       Spinner.prototype.opacity = function(el, i, val, o) {
terom@42:         var c = el.firstChild
terom@42:         o = o.shadow && o.lines || 0
terom@42:         if (c && i+o < c.childNodes.length) {
terom@42:           c = c.childNodes[i+o]; c = c && c.firstChild; c = c && c.firstChild
terom@42:           if (c) c.opacity = val
terom@42:         }
terom@42:       }
terom@42:     }
terom@42:     else
terom@42:       useCssAnimations = vendor(s, 'animation')
terom@42:   })()
terom@42: 
terom@42:   if (typeof define == 'function' && define.amd)
terom@42:     define(function() { return Spinner })
terom@42:   else
terom@42:     window.Spinner = Spinner
terom@42: 
terom@42: }(window, document);