/*

 * Supersubs v0.2b - jQuery plugin

 * Copyright (c) 2008 Joel Birch

 *

 * Dual licensed under the MIT and GPL licenses:

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

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

 *

 *

 * This plugin automatically adjusts submenu widths of suckerfish-style menus to that of

 * their longest list item children. If you use this, please expect bugs and report them

 * to the jQuery Google Group with the word 'Superfish' in the subject line.

 *

 */



;(function($){ // $ will refer to jQuery within this closure



    $.fn.supersubs = function(options){

        var opts = $.extend({}, $.fn.supersubs.defaults, options);

        // return original object to support chaining

        return this.each(function() {

            // cache selections

            var $$ = $(this);

            // support metadata

            var o = $.meta ? $.extend({}, opts, $$.data()) : opts;

            // get the font size of menu.

            // .css('fontSize') returns various results cross-browser, so measure an em dash instead

            var fontsize = $('<li id="menu-fontsize">&#8212;</li>').css({

                'padding' : 0,

                'position' : 'absolute',

                'top' : '-999em',

                'width' : 'auto'

            }).appendTo($$).width(); //clientWidth is faster, but was incorrect here

            // remove em dash

            $('#menu-fontsize').remove();

            // cache all ul elements

            $ULs = $$.find('ul');

            // loop through each ul in menu

            $ULs.each(function(i) { 

                // cache this ul

                var $ul = $ULs.eq(i);

                // get all (li) children of this ul

                var $LIs = $ul.children();

                // get all anchor grand-children

                var $As = $LIs.children('a');

                // force content to one line and save current float property

                var liFloat = $LIs.css('white-space','nowrap').css('float');

                // remove width restrictions and floats so elements remain vertically stacked

                var emWidth = $ul.add($LIs).add($As).css({

                    'float' : 'none',

                    'width' : 'auto'

                })

                // this ul will now be shrink-wrapped to longest li due to position:absolute

                // so save its width as ems. Clientwidth is 2 times faster than .width() - thanks Dan Switzer

                .end().end()[0].clientWidth / fontsize;

                // add more width to ensure lines don't turn over at certain sizes in various browsers

                emWidth += o.extraWidth;

                // restrict to at least minWidth and at most maxWidth

                if (emWidth > o.maxWidth)       { emWidth = o.maxWidth; }

                else if (emWidth < o.minWidth)  { emWidth = o.minWidth; }

                emWidth += 'em';

                // set ul to width in ems

                $ul.css('width',emWidth);

                // restore li floats to avoid IE bugs

                // set li width to full width of this ul

                // revert white-space to normal

                $LIs.css({

                    'float' : liFloat,

                    'width' : '100%',

                    'white-space' : 'normal'

                })

                // update offset position of descendant ul to reflect new width of parent

                .each(function(){

                    var $childUl = $('>ul',this);

                    var offsetDirection = $childUl.css('left')!==undefined ? 'left' : 'right';

                    $childUl.css(offsetDirection,emWidth);

                });

            });

            

        });

    };

    // expose defaults

    $.fn.supersubs.defaults = {

        minWidth        : 9,        // requires em unit.

        maxWidth        : 25,       // requires em unit.

        extraWidth      : 0         // extra width can ensure lines don't sometimes turn over due to slight browser differences in how they round-off values

    };

    

})(jQuery); // plugin code ends