/* ========================================================================
   * Bootstrap: affix.js v3.0.3
   * http://getbootstrap.com/javascript/#affix
   * ========================================================================
   * Copyright 2013 Twitter, Inc.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   * ======================================================================== */
  
  
  +function ($) { "use strict";
  
    // AFFIX CLASS DEFINITION
    // ======================
  
    var Affix = function (element, options) {
      this.options = $.extend({}, Affix.DEFAULTS, options)
      this.$window = $(window)
        .on('scroll.bs.affix.data-api', $.proxy(this.checkPosition, this))
        .on('click.bs.affix.data-api',  $.proxy(this.checkPositionWithEventLoop, this))
  
      this.$element = $(element)
      this.affixed  =
      this.unpin    = null
  
      this.checkPosition()
    }
  
    Affix.RESET = 'affix affix-top affix-bottom'
  
    Affix.DEFAULTS = {
      offset: 0
    }
  
    Affix.prototype.checkPositionWithEventLoop = function () {
      setTimeout($.proxy(this.checkPosition, this), 1)
    }
  
    Affix.prototype.checkPosition = function () {
      if (!this.$element.is(':visible')) return
  
      var scrollHeight = $(document).height()
      var scrollTop    = this.$window.scrollTop()
      var position     = this.$element.offset()
      var offset       = this.options.offset
      var offsetTop    = offset.top
      var offsetBottom = offset.bottom
  
      if (typeof offset != 'object')         offsetBottom = offsetTop = offset
      if (typeof offsetTop == 'function')    offsetTop    = offset.top()
      if (typeof offsetBottom == 'function') offsetBottom = offset.bottom()
  
      var affix = this.unpin   != null && (scrollTop + this.unpin <= position.top) ? false :
                  offsetBottom != null && (position.top + this.$element.height() >= scrollHeight - offsetBottom) ? 'bottom' :
                  offsetTop    != null && (scrollTop <= offsetTop) ? 'top' : false
  
      if (this.affixed === affix) return
      if (this.unpin) this.$element.css('top', '')
  
      this.affixed = affix
      this.unpin   = affix == 'bottom' ? position.top - scrollTop : null
  
      this.$element.removeClass(Affix.RESET).addClass('affix' + (affix ? '-' + affix : ''))
  
      if (affix == 'bottom') {
        this.$element.offset({ top: document.body.offsetHeight - offsetBottom - this.$element.height() })
      }
    }
  
  
    // AFFIX PLUGIN DEFINITION
    // =======================
  
    var old = $.fn.affix
  
    $.fn.affix = function (option) {
      return this.each(function () {
        var $this   = $(this)
        var data    = $this.data('bs.affix')
        var options = typeof option == 'object' && option
  
        if (!data) $this.data('bs.affix', (data = new Affix(this, options)))
        if (typeof option == 'string') data[option]()
      })
    }
  
    $.fn.affix.Constructor = Affix
  
  
    // AFFIX NO CONFLICT
    // =================
  
    $.fn.affix.noConflict = function () {
      $.fn.affix = old
      return this
    }
  
  
    // AFFIX DATA-API
    // ==============
  
    $(window).on('load', function () {
      $('[data-spy="affix"]').each(function () {
        var $spy = $(this)
        var data = $spy.data()
  
        data.offset = data.offset || {}
  
        if (data.offsetBottom) data.offset.bottom = data.offsetBottom
        if (data.offsetTop)    data.offset.top    = data.offsetTop
  
        $spy.affix(data)
      })
    })
  
  }(jQuery);