/**
 * @classDescription 妯℃嫙Marquee锛屾棤闂存柇婊氬姩鍐呭
 * @author Aken Li(www.kxbd.com)
 * @DOM
 *  	<div id="marquee">
 *  		<ul>
 *   			<li></li>
 *   			<li></li>
 *  		</ul>
 *  	</div>
 * @CSS
 *  	#marquee {overflow:hidden;width:200px;height:50px;}
 * @Usage
 *  	$("#marquee").kxbdMarquee(options);
 * @options
 *		isEqual:true,		//鎵€鏈夋粴鍔ㄧ殑鍏冪礌闀垮鏄惁鐩哥瓑,true,false
 *  	loop:0,				//寰幆婊氬姩娆℃暟锛?鏃舵棤闄
 *		direction:"left",	//婊氬姩鏂瑰悜锛?left","right","up","down"
 *		scrollAmount:1,		//姝ラ暱
 *		scrollDelay:20		//鏃堕暱
 */
(function($){
	$.fn.kxbdMarquee=function(options){
		var opts=$.extend({},$.fn.kxbdMarquee.defaults, options);

		return this.each(function(){
			var $marquee=$(this);				//婊氬姩鍏冪礌瀹瑰櫒
			var _scrollObj=$marquee.get(0);		//婊氬姩鍏冪礌瀹瑰櫒DOM
			var scrollW=$marquee.width();		//婊氬姩鍏冪礌瀹瑰櫒鐨勫搴
			var scrollH=$marquee.height();		//婊氬姩鍏冪礌瀹瑰櫒鐨勯珮搴
			var $element=$marquee.children();	//婊氬姩鍏冪礌
			var $kids=$element.children();		//婊氬姩瀛愬厓绱
			var scrollSize=0;					//婊氬姩鍏冪礌灏哄

			//婊氬姩绫诲瀷锛?宸﹀彸锛?涓婁笅
			var _type=(opts.direction=="left"||opts.direction=="right") ? 1:0;

			//闃叉婊氬姩瀛愬厓绱犳瘮婊氬姩鍏冪礌瀹借€屽彇涓嶅埌瀹為檯婊氬姩瀛愬厓绱犲搴
			$element.css(_type?"width":"height",10000);

			//鑾峰彇婊氬姩鍏冪礌鐨勫昂瀵
			if(opts.isEqual){
				scrollSize=$kids[_type?"outerWidth":"outerHeight"]()*$kids.length;
			}else{
				$kids.each(function(){
					scrollSize+=$(this)[_type?"outerWidth":"outerHeight"]();
				});
			};

			//婊氬姩鍏冪礌鎬诲昂瀵稿皬浜庡鍣ㄥ昂瀵革紝涓嶆粴鍔
			if(scrollSize<(_type?scrollW:scrollH)){return;}; 

			//鍏嬮殕婊氬姩瀛愬厓绱犲皢鍏舵彃鍏ュ埌婊氬姩鍏冪礌鍚庯紝骞惰瀹氭粴鍔ㄥ厓绱犲搴
			$element.append($kids.clone()).css(_type?"width":"height",scrollSize*2);

			var numMoved=0;
			function scrollFunc(){
				var _dir=(opts.direction=="left"||opts.direction=="right") ? "scrollLeft":"scrollTop";
				if (opts.loop>0) {
					numMoved+=opts.scrollAmount;
					if(numMoved>scrollSize*opts.loop){
						_scrollObj[_dir]=0;
						return clearInterval(moveId);
					};
				};

				if(opts.direction=="left"||opts.direction=="up"){
					var newPos=_scrollObj[_dir]+opts.scrollAmount;
					if(newPos>=scrollSize){
						newPos-=scrollSize;
					}
					_scrollObj[_dir]=newPos;
				}else{
					var newPos=_scrollObj[_dir]-opts.scrollAmount;
					if(newPos<=0){
						newPos += scrollSize;
					};
					_scrollObj[_dir]=newPos;
				};
			};

			//婊氬姩寮€濮
			var moveId=setInterval(scrollFunc, opts.scrollDelay);

			//榧犳爣鍒掕繃鍋滄婊氬姩
			$marquee.hover(function(){
				clearInterval(moveId);
			},function(){
				clearInterval(moveId);
				moveId=setInterval(scrollFunc, opts.scrollDelay);
			});
		});
	};

	$.fn.kxbdMarquee.defaults={
		isEqual:true,		//鎵€鏈夋粴鍔ㄧ殑鍏冪礌闀垮鏄惁鐩哥瓑,true,false
		loop: 0,			//寰幆婊氬姩娆℃暟锛?鏃舵棤闄
		direction: "left",	//婊氬姩鏂瑰悜锛?left","right","up","down"
		scrollAmount:1,		//姝ラ暱
		scrollDelay:20		//鏃堕暱

	};

	$.fn.kxbdMarquee.setDefaults=function(settings) {
		$.extend( $.fn.kxbdMarquee.defaults, settings );
	};
})(jQuery);