/**
 * @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(){
						//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.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);