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/*

* Supposition v0.2 - an optional enhancer for Superfish jQuery menu widget - LAST UPDATE: MARCH 23rd, 2011

*

* Copyright (c) 2008 Joel Birch - based mostly on work by Jesse Klaasse and credit goes largely to him.

* Special thanks to Karl Swedberg for valuable input.

* 

* Dec 28th, 2010 - Modified for the Superfish project for Drupal (http://drupal.org/project/superfish)

*

* jQuery version: 1.3.x or higher.

*

* Dual licensed under the MIT and GPL licenses:

*         http://www.opensource.org/licenses/mit-license.php

*         http://www.gnu.org/licenses/gpl.html

*/

(function($){

  $.fn.supposition = function(){

    var $w = $(window), /*do this once instead of every onBeforeShow call*/

    _offset = function(dir) {

      return window[dir == 'y' ? 'pageYOffset' : 'pageXOffset']

      || document.documentElement && document.documentElement[dir=='y' ? 'scrollTop' : 'scrollLeft']

      || document.body[dir=='y' ? 'scrollTop' : 'scrollLeft'];

    },

    onHide = function(){

      this.css({Top:'',Right:'',Bottom:'',Left:''});

    },

    onBeforeShow = function(){

      this.each(function(){

        var $u = $(this);

        $u.css('display','block');

        var menuWidth = $u.width(),

        menuParentWidth = $u.closest('li').outerWidth(true),

        menuParentLeft = $u.closest('li').offset().left,

        totalRight = $w.width() + _offset('x'),

        menuRight = $u.offset().left + menuWidth,

        exactMenuWidth = (menuRight > (menuParentWidth + menuParentLeft)) ? menuWidth - (menuRight - (menuParentWidth + menuParentLeft)) : menuWidth;  

        if ($u.parents('.sf-js-enabled').hasClass('rtl')) {

          if (menuParentLeft < exactMenuWidth) {

            $u.css('left', menuParentWidth + 'px');

            $u.css('right', 'auto');

          }

        }

        else {

          if (menuRight > totalRight && menuParentLeft > menuWidth) {

            $u.css('right', menuParentWidth + 'px');

            $u.css('left', 'auto');

          }

        }

        var windowHeight = $w.height(),

        offsetTop = $u.offset().top,

        menuParentHeight = $u.parent().outerHeight(true),

        menuHeight = $u.height(),

        baseline = windowHeight + _offset('y');

        var expandUp = ((offsetTop + menuHeight > baseline) && (offsetTop > menuHeight));

        if (expandUp) {

          $u.css('bottom', menuParentHeight + 'px');

          $u.css('top', 'auto');

        }

        $u.css('display','none');

      });

    };

    return this.each(function() {

    var o = $.fn.superfish.o[this.serial]; /* get this menu's options */

    /* if callbacks already set, store them */

    var _onBeforeShow = o.onBeforeShow,

    _onHide = o.onHide;

    $.extend($.fn.superfish.o[this.serial],{

    onBeforeShow: function() {

    onBeforeShow.call(this); /* fire our Supposition callback */

    _onBeforeShow.call(this); /* fire stored callbacks */

    },

    onHide: function() {

    onHide.call(this); /* fire our Supposition callback */

    _onHide.call(this); /* fire stored callbacks */

    }

    });

    });

  };

})(jQuery);