/**
 * 图片放大 2017年2月27日 15:06:38
 */
(function() {
	/**
	 * 
	 * 作者 : 老可 日期 : 2015-05-26 版本 : v1.2 QQ : 279662403 群 246502174 兼容性 : IE6+
	 */

	var EventUtil, Get, Element;
	EventUtil = {
		addHandler : function(ele, type, handler) {
			if (ele.addEventListener) {
				ele.addEventListener(type, handler, false)
			} else if (ele.attachEvent) {
				ele.attachEvent("on" + type, handler)
			} else {
				ele["on" + type] = handler;
			}
		},
		removeHandler : function(element, type, handler) {
			if (element.removeEventListener) {
				element.removeEventListener(type, handler, false);
			} else if (element.detachEvent) {
				element.detachEvent("on" + type, handler);
			} else {
				element["on" + type] = null;
			}
		},
		getEvent : function(event) {
			return event ? event : window.event;
		},
		getTarget : function(event) {
			return event.target || event.srcElement;
		},
		preventDefault : function(event) {
			if (event.preventDefault) {
				event.preventDefault();
			} else {
				event.returnValue = false;
			}
		},
		stopPropagation : function(event) {
			if (event.stopPropagation) {
				event.stopPropagation();
			} else {
				event.cancelBubble = true;
			}
		}
	};

	Get = {
		byId : function(id) {
			return typeof id === "string" ? document.getElementById(id) : id
		},
		byClass : function(sClass, oParent) {
			var aClass = [];
			var reClass = new RegExp("(^| )" + sClass + "( |$)");
			var aElem = this.byTagName("*", oParent);
			for (var i = 0; i < aElem.length; i++)
				reClass.test(aElem[i].className) && aClass.push(aElem[i]);
			return aClass
		},
		byTagName : function(elem, obj) {
			return (obj || document).getElementsByTagName(elem)
		}
	};

	Element = {
		hasClass : function(obj, name) {
			return (' ' + obj.className + ' ').indexOf(' ' + name + ' ') > -1 ? true
					: false;
		},
		addClass : function(obj, name) {
			if (this.hasClass(obj, name))
				return;
			obj.className += ' ' + name;
		},
		removeClass : function(obj, name) {
			obj.className = obj.className.replace(
					new RegExp('(^|\\s)' + name + '(?:\\s|$)'), '$1').replace(
					/\s{1,}/g, ' ');
		}
	}

	function MagnifierF() {
		this.init.apply(this, arguments);
	}

	MagnifierF.prototype = {
		init : function(id) {
			var _is = this;
			this.magWrap = Get.byId(id);
			this.magMain = this.magWrap.children[0];
			this.mW = this.magMain.offsetWidth;
			this.mH = this.magMain.offsetHeight;
			this.magImg = this.magMain.getElementsByTagName('img')[0];
			this.mImgSrc = this.magImg.getAttribute('src');//.slice(0, -4);
			this.specBox = Get.byClass("spec-items", this.magWrap)[0];
			this.specUl = this.specBox.getElementsByTagName('ul')[0];
			this.specItem = this.specBox.getElementsByTagName('li');

			_is.specFn();
			_is.setEventFn().dragEvent();

		},
		setEleFn : function() {
			var _is = this, _html1 = "", oFrag = document
					.createDocumentFragment(), oFrag2 = document
					.createDocumentFragment();

			_is.oMD = document.createElement('div');
			_is.oMD.className = "MagnifierDrag";
			_is.oMD.style.cssText = 'width:' + _is.mW / 2 + 'px;height:'
					+ _is.mH / 2 + 'px;';
			_is.oMD.innerHTML = "&nbsp;";

			_is.oMP = document.createElement('div');
			_is.oMP.className = 'MagnifierPop';
			_is.oMP.style.cssText = 'width:' + _is.mW + 'px;height:' + _is.mH
					+ 'px;right:' + (-_is.mW - 10) + 'px;';

			_is.oMI = document.createElement('div');
			_is.oMI.className = 'MagnifierImg';
			_is.oMI.style.cssText = 'width:' + _is.mW * 2 + 'px;height:'
					+ _is.mH * 2 + 'px;';
			_html1 = '<img style="width:100%;height:100%;" src="' + _is.mImgSrc
					+ '">'
			_is.oMI.innerHTML = _html1;

			_is.oMP.appendChild(_is.oMI)

			oFrag.appendChild(_is.oMD);
			oFrag2.appendChild(_is.oMP);

			_is.magMain.appendChild(oFrag);
			_is.magWrap.appendChild(oFrag2);

		},
		removeFn : function() {
			var _is = this;
			_is.magMain.removeChild(_is.oMD);
			_is.magWrap.removeChild(_is.oMP);
		},
		setMousemoveFn : function(event) {
			var _is = this,

			_WinScrLeft = document.documentElement.scrollLeft
					|| document.body.scrollLeft, _WinScrTop = document.documentElement.scrollTop
					|| document.body.scrollTop;

			_x = event.clientX + _WinScrLeft
					- (_is.magWrap.getBoundingClientRect().left + _WinScrLeft)
					- _is.oMD.offsetWidth / 2;

			_y = event.clientY + _WinScrTop
					- (_is.magMain.getBoundingClientRect().top + _WinScrTop)
					- _is.oMD.offsetHeight / 2;

			_l = _is.magMain.offsetWidth - _is.oMD.offsetWidth;
			_t = _is.magMain.offsetHeight - _is.oMD.offsetHeight;

			_l2 = -(_is.oMI.offsetWidth - _is.magMain.offsetWidth);
			_t2 = -(_is.oMI.offsetHeight - _is.magMain.offsetHeight);

			if (_x < 0) {
				_x = 0;
			} else if (_x > _l) {
				_x = _l;
			}

			if (_y < 0) {
				_y = 0;
			} else if (_y > _t) {
				_y = _t;
			}

			_is.oMD.style.left = _x + "px";
			_is.oMD.style.top = _y + "px";

			_bigx = _x / _l;
			_bigy = _y / _t;

			_is.oMI.style.left = _bigx * _l2 + "px";
			_is.oMI.style.top = _bigy * _t2 + "px";
		},
		setEventFn : function() {
			var _is = this, _x = 0, _y = 0, _l = 0, _t = 0, _bigx = 0, _bigy = 0, _l2 = 0, _t2 = 0;

			function handleEvent(event) {
				event = EventUtil.getEvent(event);

				switch (event.type) {
				case "mouseenter":
					_is.setEleFn();
					break;
				case "mousemove":
					if (_is.oMD) {
						_is.setMousemoveFn(event);
					}
					break;
				case "mouseleave":
					_is.removeFn();
					break;
				}

			}
			return {
				dragEvent : function() {

					EventUtil
							.addHandler(_is.magMain, "mouseenter", handleEvent);
					EventUtil.addHandler(_is.magMain, "mousemove", handleEvent);
					EventUtil
							.addHandler(_is.magMain, "mouseleave", handleEvent);
				}
			}

		},
		specFn : function() {
			var _is = this, _oSpImg, _oISrc, oLBtn = Get.byClass("spe_leftBtn",
					_is.magWrap)[0], oRBtn = Get.byClass("spe_rightBtn",
					_is.magWrap)[0], oLiW = this.specUl
					.getElementsByTagName('li')[0].offsetWidth + 5, _len = _is.specItem.length, n = 0, l = null, r = null;

			function TabFn(event) {
				var target = EventUtil.getTarget(event), i = 0;

				if (target.nodeName != "UL") {

					if (target.nodeName == "IMG") {
						target = target.parentNode;
					}
					for (; i < _len; i++) {
						_is.specItem[i].className = '';
					}
					target.className = 'on';

					_oSpImg = target.getElementsByTagName('img')[0];
					_oISrc = _oSpImg.getAttribute('src');

					_is.magImg.setAttribute('src', _oISrc);
					_is.mImgSrc = _oISrc;//.slice(0, -4);
				}

			}
			EventUtil.addHandler(_is.specUl, "mouseover", TabFn);

			function moveFn(event) {
				var target = EventUtil.getTarget(event);

				if (target.className.indexOf("spe_rightBtn") > -1) {
					r = ++n;
					if (r > _len - 5)
						Element.removeClass(target, "on");

					if (r > _len - 4) {

						n = _len - 4;
						return false;
					} else {

						_is.buttur(_is.specUl, {
							left : -(r * oLiW)
						});
						Element.addClass(oLBtn, "on");
					}
				}
				if (target.className.indexOf("spe_leftBtn") > -1) {
					l = --n;
					if (l < 1)
						Element.removeClass(target, "on");

					if (l < 0) {

						n = 0;
						return false;
					} else {

						_is.buttur(_is.specUl, {
							left : -(l * oLiW)
						});
						Element.addClass(oRBtn, "on");
					}
				}
			}

			if (_len > 4) {

				Element.addClass(oRBtn, "on");
				EventUtil.addHandler(_is.magWrap, "click", moveFn);
			}

		},
		buttur : function(ele, obj) {

			window.clearTimeout(ele.timer);

			var _this = this, end = null;

			for (direc in obj) {

				var direc1 = direc.toLowerCase(), strOffset = "offset"
						+ direc1.substr(0, 1).toUpperCase()
						+ direc1.substring(1).toLowerCase(), target = obj[direc], nSpeed = (target - ele[strOffset]) / 8;

				nSpeed = nSpeed >= 0 ? Math.ceil(nSpeed) : Math.floor(nSpeed);
				ele.style[direc1] = ele[strOffset] + nSpeed + "px";
				end += nSpeed;

			}

			if (end)

				if (typeof fnCallback == "function") {
					fnCallback.call(ele);
				} else {

					ele.timer = window.setTimeout(function() {
						_this.buttur(ele, obj)
					}, 20);

				}
		}

	}

	window['MagnifierF'] = function(id) {
		return new MagnifierF(id);
	}

})();

window.onload = function() {

	MagnifierF("MagnifierWrap");

}