jquery superMarquee

/**
 * @DOM
 *      <div id="marquee">
 *              <ul>
 *                      <li></li>
 *                      <li></li>
 *              </ul>
 *      </div>
 * @CSS
 *      #marquee {200px;height:50px;overflow:hidden;}
 * @Usage
 *      $('#marquee').superMarquee(options);
 * @options
 *              distance:200,//一次滚动的距离
 *              duration:20,//缓动效果，单次移动时间，越小速度越快，为0时无缓动效果
 *              time:5,//停顿时间，单位为秒
 *              direction: 'left',//滚动方向，'left','right','up','down'
 *              scrollAmount:1,//步长
 *              scrollDelay:20//时长，单位为毫秒
 *              isEqual:true,//所有滚动的元素长宽是否相等,true,false
 *              loop: 0,//循环滚动次数，0时无限
 *              btnGo:{left:'#goL',right:'#goR'},//控制方向的按钮ID，有四个属性left,right,up,down分别对应四个方向
 *              eventGo:'click',//鼠标事件
 *              controlBtn:{left:'#goL',right:'#goR'},//控制加速滚动的按钮ID，有四个属性left,right,up,down分别对应四个方向
 *              newAmount:4,//加速滚动的步长
 *              eventA:'mouseenter',//鼠标事件，加速
 *              eventB:'mouseleave',//鼠标事件，原速
 *              navId:'#marqueeNav', //导航容器ID，导航DOM:<ul><li>1</li><li>2</li><ul>,导航CSS:.navOn
 *              eventNav:'click' //导航事件
 */
(function($){

        $.fn.superMarquee = function(options){
                var opts = $.extend({},$.fn.superMarquee.defaults, options);
                
                return this.each(function(){
                        var $marquee = $(this);//滚动元素容器
                        var _scrollObj = $marquee.get(0);//滚动元素容器DOM
                        var scrollW = $marquee.width();//滚动元素容器的宽度
                        var scrollH = $marquee.height();//滚动元素容器的高度
                        var $element = $marquee.children(); //滚动元素
                        var $kids = $element.children();//滚动子元素
                        var scrollSize=0;//滚动元素尺寸
                        var _type = (opts.direction == 'left' || opts.direction == 'right') ? 1:0;//滚动类型，1左右，0上下
                        var scrollId, rollId, isMove, marqueeId;
                        var t,b,c,d,e; //滚动动画的参数,t:当前时间，b:开始的位置，c:改变的位置，d:持续的时间，e:结束的位置
                        var _size, _len; //子元素的尺寸与个数
                        var $nav,$navBtns;
                        var arrPos = [];
                        var numView = 0; //当前所看子元素
                        var numRoll=0; //轮换的次数
                        var numMoved = 0;//已经移动的距离

                        //防止滚动子元素比滚动元素宽而取不到实际滚动子元素宽度
                        $element.css(_type?'width':'height',10000);
                        //获取滚动元素的尺寸
                        var navHtml = '<ul>';
                        if (opts.isEqual) {
                                _size = $kids[_type?'outerWidth':'outerHeight']();
                                _len = $kids.length;
                                scrollSize = _size * _len;
                                for(var i=0;i<_len;i++){
                                        arrPos.push(i*_size);
                                        navHtml += '<li>'+ (i+1) +'</li>';
                                }
                        }else{
                                $kids.each(function(i){
                                        arrPos.push(scrollSize);
                                        scrollSize += $(this)[_type?'outerWidth':'outerHeight']();
                                        navHtml += '<li>'+ (i+1) +'</li>';
                                });
                        }
                        navHtml += '</ul>';
                        
                        //滚动元素总尺寸小于容器尺寸，不滚动
                        if (scrollSize<(_type?scrollW:scrollH)) return;
                        //克隆滚动子元素将其插入到滚动元素后，并设定滚动元素宽度
                        $element.append($kids.clone()).css(_type?'width':'height',scrollSize*2);
                        
                        //轮换导航
                        if (opts.navId) {
                                $nav = $(opts.navId).append(navHtml).hover( stop, start );
                                $navBtns = $('li', $nav);
                                $navBtns.each(function(i){
                                        $(this).bind(opts.eventNav,function(){
                                                if(isMove) return;
                                                if(numView==i) return;
                                                rollFunc(arrPos[i]);
                                                $navBtns.eq(numView).removeClass('navOn');
                                                numView = i;
                                                $(this).addClass('navOn');
                                        });
                                });
                                $navBtns.eq(numView).addClass('navOn');
                        }
                        
                        //设定初始位置
                        if (opts.direction == 'right' || opts.direction == 'down') {
                                _scrollObj[_type?'scrollLeft':'scrollTop'] = scrollSize;
                        }else{
                                _scrollObj[_type?'scrollLeft':'scrollTop'] = 0;
                        }
                        
                        if(opts.isMarquee){
                                //滚动开始
                                //marqueeId = setInterval(scrollFunc, opts.scrollDelay);
                                marqueeId = setTimeout(scrollFunc, opts.scrollDelay);
                                //鼠标划过停止滚动
                                $marquee.hover(
                                        function(){
                                                clearInterval(marqueeId);
                                        },
                                        function(){
                                                //marqueeId = setInterval(scrollFunc, opts.scrollDelay);
                                                clearInterval(marqueeId);
                                                marqueeId = setTimeout(scrollFunc, opts.scrollDelay);
                                        }
                                );
                                
                                //控制加速运动
                                if(opts.controlBtn){
                                        $.each(opts.controlBtn, function(i,val){
                                                $(val).bind(opts.eventA,function(){
                                                        opts.direction = i;
                                                        opts.oldAmount = opts.scrollAmount;
                                                        opts.scrollAmount = opts.newAmount;
                                                }).bind(opts.eventB,function(){
                                                        opts.scrollAmount = opts.oldAmount;
                                                });
                                        });
                                }
                        }else{
                                if(opts.isAuto){
                                        //轮换开始
                                        start();
                                        
                                        //鼠标划过停止轮换
                                        $marquee.hover( stop, start );
                                }
                        
                                //控制前后走
                                if(opts.btnGo){
                                        $.each(opts.btnGo, function(i,val){
                                                $(val).bind(opts.eventGo,function(){
                                                        if(isMove == true) return;
                                                        opts.direction = i;
                                                        rollFunc();
                                                        if (opts.isAuto) {
                                                                stop();
                                                                start();
                                                        }
                                                });
                                        });
                                }
                        }
                        
                        function scrollFunc(){
                                var _dir = (opts.direction == 'left' || opts.direction == 'right') ? 'scrollLeft':'scrollTop';
                                
                                if(opts.isMarquee){
                                        if (opts.loop > 0) {
                                                numMoved+=opts.scrollAmount;
                                                if(numMoved>scrollSize*opts.loop){
                                                        _scrollObj[_dir] = 0;
                                                        return clearInterval(marqueeId);
                                                }
                                        }
                                        var newPos = _scrollObj[_dir]+(opts.direction == 'left' || opts.direction == 'up'?1:-1)*opts.scrollAmount;
                                }else{
                                        if(opts.duration){
                                                if(t++<d){
                                                        isMove = true;
                                                        var newPos = Math.ceil(easeOutQuad(t,b,c,d));
                                                        if(t==d){
                                                                newPos = e;
                                                        }
                                                }else{
                                                        newPos = e;
                                                        clearInterval(scrollId);
                                                        isMove = false;
                                                        return;
                                                }
                                        }else{
                                                var newPos = e;
                                                clearInterval(scrollId);
                                        }
                                }
                                
                                if(opts.direction == 'left' || opts.direction == 'up'){
                                        if(newPos>=scrollSize){
                                                newPos-=scrollSize;
                                        }
                                }else{
                                        if(newPos<=0){
                                                newPos+=scrollSize;
                                        }
                                }
                                _scrollObj[_dir] = newPos;
                                
                                if(opts.isMarquee){
                                        marqueeId = setTimeout(scrollFunc, opts.scrollDelay);
                                }else if(t<d){
                                        if(scrollId) clearTimeout(scrollId);
                                        scrollId = setTimeout(scrollFunc, opts.scrollDelay);
                                }else{
                                        isMove = false;
                                }
                                
                        };
                        
                        function rollFunc(pPos){
                                isMove = true;
                                var _dir = (opts.direction == 'left' || opts.direction == 'right') ? 'scrollLeft':'scrollTop';
                                var _neg = opts.direction == 'left' || opts.direction == 'up'?1:-1;

                                numRoll = numRoll +_neg;
                                //得到当前所看元素序号并改变导航CSS
                                if(pPos == undefined&&opts.navId){
                                        $navBtns.eq(numView).removeClass('navOn');
                                        numView +=_neg;
                                        if(numView>=_len){
                                                numView = 0;
                                        }else if(numView<0){
                                                numView = _len-1;
                                        }
                                        $navBtns.eq(numView).addClass('navOn');
                                        numRoll = numView;
                                }

                                var _temp = numRoll<0?scrollSize:0;
                                t=0;
                                b=_scrollObj[_dir];
                                //c=(pPos != undefined)?pPos:_neg*opts.distance;
                                e=(pPos != undefined)?pPos:_temp+(opts.distance*numRoll)%scrollSize;
                                if(_neg==1){
                                        if(e>b){
                                                c = e-b;
                                        }else{
                                                c = e+scrollSize -b;
                                        }
                                }else{
                                        if(e>b){
                                                c =e-scrollSize-b;
                                        }else{
                                                c = e-b;
                                        }
                                }
                                d=opts.duration;
                                
                                //scrollId = setInterval(scrollFunc, opts.scrollDelay);
                                if(scrollId) clearTimeout(scrollId);
                                scrollId = setTimeout(scrollFunc, opts.scrollDelay);
                        }
                        
                        function start(){
                                rollId = setInterval(function(){
                                        rollFunc();
                                }, opts.time*1000);
                        }
                        function stop(){
                                clearInterval(rollId);
                        }
                        
                        function easeOutQuad(t,b,c,d){
                                return -c *(t/=d)*(t-2) + b;
                        }
                        
                        function easeOutQuint(t,b,c,d){
                                return c*((t=t/d-1)*t*t*t*t + 1) + b;
                        }

                });
        };
        $.fn.superMarquee.defaults = {
                isMarquee:false,//是否为Marquee
                isEqual:true,//所有滚动的元素长宽是否相等,true,false
                loop: 0,//循环滚动次数，0时无限
                newAmount:3,//加速滚动的步长
                eventA:'mousedown',//鼠标事件，加速
                eventB:'mouseup',//鼠标事件，原速
                isAuto:true,//是否自动轮换
                time:5,//停顿时间，单位为秒
                duration:50,//缓动效果，单次移动时间，越小速度越快，为0时无缓动效果
                eventGo:'click', //鼠标事件，向前向后走
                direction: 'left',//滚动方向，'left','right','up','down'
                scrollAmount:1,//步长
                scrollDelay:10,//时长
                eventNav:'click'//导航事件
        };
        
        $.fn.superMarquee.setDefaults = function(settings) {
                $.extend( $.fn.superMarquee.defaults, settings );
        };
        
})(jQuery);