/*
* jQuery JavaScript Library Marquee Plus 1.0
* http://mzoe.com/
*
* Copyright (c) 2009 MZOE
* Dual licensed under the MIT and GPL licenses.
*
* Date: 2009-05-13 18:54:21
*/
(function($) {
    $.fn.marquee = function(o) {
        //获取滚动内容内各元素相关信息
        o = $.extend({
            speed: parseInt($(this).attr('speed')) || 30,          // 滚动速度
            step: parseInt($(this).attr('step')) || 1,            // 滚动步长
            direction: $(this).attr('direction') || 'up',              // 滚动方向
            pause: parseInt($(this).attr('pause')) || 1000,        // 停顿时长
            prev: $(this).attr('prev') || '',                     // 前面
            next: $(this).attr('next') || ''                      // 后面
        }, o || {});
        var dIndex = jQuery.inArray(o.direction, ['right', 'down']);
        if (dIndex > -1) {
            o.direction = ['left', 'up'][dIndex];
            o.step = -o.step;
        }
        var count;

        var mid;
        var div = $(this);                                      // 容器对象
        var divWidth = div.innerWidth();                             // 容器宽
        var divHeight = div.innerHeight();                            // 容器高
        var ul = $("ul", div);
        var li = $("li", ul);
        var liSize = li.size();                                    // 初始元素个数
        var liWidth = li.width();                                   // 元素宽
        var liHeight = li.height();                                  // 元素高
        var width = liWidth * liSize;
        var height = liHeight * liSize;
        if ((o.direction == 'left' && width > divWidth) ||
			(o.direction == 'up' && height > divHeight)) {
            // 元素超出可显示范围才滚动

            if (o.direction == 'left') {
                ul.width(2 * liSize * liWidth);
                if (o.step < 0) div.scrollLeft(width);
            } else {
                ul.height(2 * liSize * liHeight);
                if (o.step < 0) div.scrollTop(height);
            }
            ul.append(li.clone()); // 复制元素
            mid = setInterval(_ylMarquee, o.speed);
            div.hover(
				function() { clearInterval(mid); },
				function() { mid = setInterval(_ylMarquee, o.speed); }
			);
        }
        if (o.prev.length > 0 && o.next.length > 0) {
            $("#" + o.prev).click(function() { if (o.step < 0) o.step = -o.step; clearInterval(mid); mid = setInterval(_ylMarquee, o.speed); });
            $("#" + o.next).click(function() { if (o.step > 0) o.step = -o.step; clearInterval(mid); mid = setInterval(_ylMarquee, o.speed); });
        }

        function _ylMarquee() {
            //滚动
            if (o.direction == 'left') {
                if (o.step > 0 && div.scrollLeft() >= width) {
                    div.scrollLeft(0);
                }
                else if(div.scrollLeft() <= 0) {
                        div.scrollLeft(width);
                }
                div.scrollLeft(div.scrollLeft() + o.step);
            }
            else {
                if (div.scrollTop() >= height) {
                    div.scrollTop(0);
                } else {
                    div.scrollLeft(div.scrollTop() + o.step);
                }
            }
        }
        function _pause() {
            // 停顿
            if (o.pause > 0) {
                var tempStep = o.step;
                o.step = 0;
                setTimeout(function() {
                    o.step = tempStep;
                }, o.pause);
            }
        }
        function _direction() {

        }
    };
})(jQuery);
$(document).ready(function() {
    $(".marquee").each(function() {
        $(this).marquee();
    });
});