/**
* @classDescription 超级Marquee，可做图片导航，图片轮换
* @author Aken Li(www.kxbd.com)
* @date 2009-07-27
* @dependence jQuery 1.3.2
* @DOM
*      <div id="marquee">
*          <ul>
*               <li></li>
*               <li></li>
*          </ul>
*      </div>
* @CSS
*      #marquee {width:200px;height:50px;overflow:hidden;}
* @Usage
*      $('#marquee').kxbdSuperMarquee(options);
* @options
*        distance:200,//一次滚动的距离
*        duration:20,//缓动效果，单次移动时间，越小速度越快，为0时无缓动效果
*        time:5,//停顿时间，单位为秒
*        direction: 'left',//滚动方向，'left','right','up','down'
*        scrollAmount:1,//步长
*        scrollDelay:20//时长，单位为毫秒
*        isEqual:true,//所有滚动的元素长宽是否相等,true,false
*        loop: 0,//循环滚动次数，0时无限
*        btnGo:{left:'#goL',right:'#goR'},//控制方向的按钮ID，有四个属性left,right,up,down分别对应四个方向
*        eventGo:'click',//鼠标事件
*        controlBtn:{left:'#goL',right:'#goR'},//控制加速滚动的按钮ID，有四个属性left,right,up,down分别对应四个方向
*        newAmount:4,//加速滚动的步长
*        eventA:'mouseenter',//鼠标事件，加速
*        eventB:'mouseleave',//鼠标事件，原速
*        navId:'#marqueeNav', //导航容器ID，导航DOM:<ul><li>1</li><li>2</li><ul>,导航CSS:.navOn
*        eventNav:'click' //导航事件
*/
(function ($) {

    $.fn.kxbdSuperMarquee = function (options) {
        var opts = $.extend({}, $.fn.kxbdSuperMarquee.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 () {
                        clearInterval(marqueeId);
                        //marqueeId = setInterval(scrollFunc, opts.scrollDelay);
                        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.kxbdSuperMarquee.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.kxbdSuperMarquee.setDefaults = function (settings) {
        $.extend($.fn.kxbdSuperMarquee.defaults, settings);
    };

})(jQuery);