www.ndjsxh.com/.svn/pristine/bc/bca9fd7f7f7eb195c32d88fee76a79c4c51302f0.svn-base

"use strict";

/**
 * @classDescription 模拟Marquee，无间断滚动内容
 * @author Lyc 修改
 * @DOM
 *  	<div id="marquee">
 *  		<ul>
 *   			<li></li>
 *   			<li></li>
 *  		</ul>
 *  	</div>
 * @CSS
 *  	#marquee {overflow:hidden;width:200px;height:50px;}
 * @Usage
 *  	$("#marquee").kxbdMarquee(options);
 * @options
 *		isEqual:true,		//所有滚动的元素长宽是否相等,true,false
 *  	loop:0,				//循环滚动次数，0时无限
 *		direction:"left",	//滚动方向，"left","right","up","down"
 *		scrollAmount:1,		//步长
 *		scrollDelay:20		//时长
 */
(function ($) {
	$.fn.kxbdMarquee = function (options) {
		var opts = $.extend({}, $.fn.kxbdMarquee.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

			//滚动类型，1左右，0上下
			var _type = opts.direction == "left" || opts.direction == "right" ? 1 : 0;

			//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
			if (opts.isEqual) {
				scrollSize = $kids[_type ? "outerWidth" : "outerHeight"]() * $kids.length;
			} else {
				$kids.each(function () {
					scrollSize += $(this)[_type ? "outerWidth" : "outerHeight"]();
				});
			};

			//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);

			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;
				};
			};

			//滚动开始
			var moveId = setInterval(scrollFunc, opts.scrollDelay);

			//鼠标划过停止滚动
			$marquee.hover(function () {
				clearInterval(moveId);
			}, function () {
				clearInterval(moveId);
				moveId = setInterval(scrollFunc, opts.scrollDelay);
			});
		});
	};

	$.fn.kxbdMarquee.defaults = {
		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
		direction: "left", //滚动方向，"left","right","up","down"
		scrollAmount: 1, //步长
		scrollDelay: 20 //时长

	};

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