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share/www/static/spin.js  view on Meta::CPAN

  }

  /**
   * Tries various vendor prefixes and returns the first supported property.
   **/
  function vendor(el, prop) {
    var s = el.style
      , pp
      , i

    if(s[prop] !== undefined) return prop
    prop = prop.charAt(0).toUpperCase() + prop.slice(1)
    for(i=0; i<prefixes.length; i++) {
      pp = prefixes[i]+prop
      if(s[pp] !== undefined) return pp
    }
  }

  /**
   * Sets multiple style properties at once.
   */
  function css(el, prop) {
    for (var n in prop)
      el.style[vendor(el, n)||n] = prop[n]

    return el
  }

  /**
   * Fills in default values.
   */
  function merge(obj) {
    for (var i=1; i < arguments.length; i++) {
      var def = arguments[i]
      for (var n in def)
        if (obj[n] === undefined) obj[n] = def[n]
    }
    return obj
  }

  /**
   * Returns the absolute page-offset of the given element.
   */
  function pos(el) {
    var o = { x:el.offsetLeft, y:el.offsetTop }
    while((el = el.offsetParent))
      o.x+=el.offsetLeft, o.y+=el.offsetTop

    return o
  }

  var defaults = {
    lines: 12,            // The number of lines to draw
    length: 7,            // The length of each line
    width: 5,             // The line thickness
    radius: 10,           // The radius of the inner circle
    rotate: 0,            // Rotation offset
    corners: 1,           // Roundness (0..1)
    color: '#000',        // #rgb or #rrggbb
    speed: 1,             // Rounds per second
    trail: 100,           // Afterglow percentage
    opacity: 1/4,         // Opacity of the lines
    fps: 20,              // Frames per second when using setTimeout()
    zIndex: 2e9,          // Use a high z-index by default
    className: 'spinner', // CSS class to assign to the element
    top: 'auto',          // center vertically
    left: 'auto',         // center horizontally
    position: 'relative'  // element position
  }

  /** The constructor */
  function Spinner(o) {
    if (!this.spin) return new Spinner(o)
    this.opts = merge(o || {}, Spinner.defaults, defaults)
  }

  Spinner.defaults = {}

  merge(Spinner.prototype, {
    spin: function(target) {
      this.stop()
      var self = this
        , o = self.opts
        , el = self.el = css(createEl(0, {className: o.className}), {position: o.position, width: 0, zIndex: o.zIndex})
        , mid = o.radius+o.length+o.width
        , ep // element position
        , tp // target position

      if (target) {
        target.insertBefore(el, target.firstChild||null)
        tp = pos(target)
        ep = pos(el)
        css(el, {
          left: (o.left == 'auto' ? tp.x-ep.x + (target.offsetWidth >> 1) : parseInt(o.left, 10) + mid) + 'px',
          top: (o.top == 'auto' ? tp.y-ep.y + (target.offsetHeight >> 1) : parseInt(o.top, 10) + mid)  + 'px'
        })
      }

      el.setAttribute('aria-role', 'progressbar')
      self.lines(el, self.opts)

      if (!useCssAnimations) {
        // No CSS animation support, use setTimeout() instead
        var i = 0
          , fps = o.fps
          , f = fps/o.speed
          , ostep = (1-o.opacity) / (f*o.trail / 100)
          , astep = f/o.lines

        ;(function anim() {
          i++;
          for (var s=o.lines; s; s--) {
            var alpha = Math.max(1-(i+s*astep)%f * ostep, o.opacity)
            self.opacity(el, o.lines-s, alpha, o)
          }
          self.timeout = self.el && setTimeout(anim, ~~(1000/fps))
        })()
      }
      return self
    },