/* ========================================================================

  * 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);