/*
 * jScroll 1.0
 * Copyright (C) 2009 wo_is神仙 All Rights Reserved.
 * Licensed: http://www.gnu.org/licenses/gpl.html
*/
;(function($){
        $.fn.extend({
                "jScroll":function(o){
                        o = $.extend({
                                auto: 3000, //延迟时间（毫秒）
                                speed: 800, //单次滚动时长（毫秒）
                                vertical: false, //是否向上滚动(默认向左)
                                scroll: 1 //每次滚动的元素数量
                        },o);
                        var running = false, sizeCss = o.vertical ? "height" : "width", ulSize = 0;
                        var scrollTimer, scrollLen, itemSize, animCss, i;
                        var div = $(this), ul = div.find("ul"), li = ul.children("li");
                        
                        div.css({overflow: "hidden"});
                        ul.css({margin: "0", padding: "0", display: "inline-block"});
                        li.css({"list-style-type": "none", float: o.vertical ? "none" : "left"});
                        
                        //获取LI元素总宽(高)
                        for(i=0; i<=li.size()-1; i++){
                                itemSize = o.vertical ? li.eq(i).outerHeight() : li.eq(i).outerWidth();
                                ulSize+=itemSize;
                        }
                        var divSize = o.vertical ? div.height() : div.width(); //容器宽(高)
                        ul.css(sizeCss, (ulSize*2)+"px");
                        if(ulSize > divSize) running = true; //UL的宽(高)大于容的器宽(高)时才滚动
                
                        div.hover(function(){
                                clearInterval(scrollTimer);
                        },function(){
                                if(running){
                                        scrollTimer = setInterval(function(){
                                                scrollLen = 0;
                                                itemSize = 0;
                                                li = ul.children("li");
                                                for(i=0; i<=o.scroll-1; i++){
                                                        itemSize = o.vertical ? li.eq(i).outerHeight() : li.eq(i).outerWidth();
                                                        scrollLen+=itemSize;
                                                }
                                                animCss = o.vertical ? {marginTop:-scrollLen +"px"} : {marginLeft:-scrollLen +"px"};
                                                ul.animate(animCss, o.speed, function(){
                                                        ul.css(o.vertical ? "margin-top" : "margin-left", "0");
                                                        li.slice(0,o.scroll).appendTo(ul); //将前面的元素移至末尾
                                                })
                                        }, parseInt(o.auto+o.speed));
                                }
                        }).trigger("mouseleave"); //DOM加载完毕后自动执行hover(fn1, fn2)的fn2
                }
        });
})(jQuery);