1 /**
  2  *
  3  * dom
  4  * @fileOverView core/dom
  5  * @author  <a href="mailto:zhang.gd@foxmail.com">Zhang Guangda</a>
  6  * @date    2012-10-25
  7  */
  8 define("core/dom", function() {
  9 	/**
 10 	 * @class we dom方法
 11 	 */
 12 	$we.dom = {
 13 		/**
 14 		 * 获取当前事件的event对象
 15 		 * @return {event} event对象
 16 		 */
 17 		getEvent: function() {
 18 			if (typeof event != "undefined")
 19 				return event;
 20 
 21 			var func = $we.dom.getEvent.caller;
 22 			while(func != null) {
 23 				var e = func.arguments[0];
 24 				if(e && (e + "").indexOf("Event") >= 0) return e;
 25 				func = func.caller;
 26 			}
 27 			return null;
 28 		},
 29 
 30 		/**
 31 		 * 获取当前事件的触发对象
 32 		 * @param {event} e event对象，可不传
 33 		 * @return {dom} dom 对象
 34 		 */
 35 		getTarget: function(e) {
 36 			e = e || this.getEvent();
 37 			return e.srcElement || e.target;
 38 		},
 39 
 40 		/**
 41 		 * 屏幕滑动至某位置
 42 		 * @param  {dom}   to   滑动到的对象
 43 		 * @param  {integer}   time 时间
 44 		 * @param  {Function} cb   回调函数
 45 		 */
 46 		scrollTo: function(to, time, cb) {
 47 			if (!to) return;
 48 
 49 			if (typeof to == "number" || typeof to == "string") to = to;
 50 			else if (typeof to == "object")
 51 				to = $(to).offset().top;
 52 
 53 			if (!to) return;		
 54 
 55 			var $body = (window.opera) ? (document.compatMode == "CSS1Compat" ? $('html') : $('body')) : $('html,body');
 56 			time = time || 300;
 57 			cb = cb || $we.emptyFunction;
 58 
 59 	        $($body).animate({scrollTop: to}, time, cb);
 60 		},
 61 
 62 		/**
 63 		 * 判断图片是否已经加载完成，完成后执行回调
 64 		 * @param  {dom}   el 元素
 65 		 * @param  {Function} cb 回调
 66 		 */
 67 		imageLoaded: function(el, cb) {
 68 			if (arguments.length < 2 && typeof arguments[0] === "function") {
 69 				cb = el;
 70 				el = $("body");
 71 			}
 72 
 73 			cb = cb || $we.emptyFunction;
 74 
 75 			var imgs = $(el).find("img"),
 76 				total = imgs.length,
 77 				cur = 0;
 78 
 79 			if (!total) cb();
 80 
 81 			var judgeAllLoaded = function() {
 82 				if (++cur >= total - 1) cb();
 83 			};
 84 
 85 			imgs.each(function(index) {
 86 				if (this.complete || this.readyStatus === "complete") {
 87 					judgeAllLoaded();
 88 				} else {
 89 					$(this).on("load", judgeAllLoaded);
 90 				}
 91 			});
 92 		}
 93 	};
 94 
 95 	return $we.dom;
 96 });