"use strict";

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