JS拖动容器工具类
var isIE = (document.all) ? true : false;var $ = function(id) {return "string" == typeof id ? document.getElementById(id) : id;};var Class = {create : function() {return function() {this.initialize.apply(this, arguments);}}}var Extend = function(destination, source) {for (var property in source) {destination[property] = source[property];}}var Bind = function(object, fun) {return function() {return fun.apply(object, arguments);}}var BindAsEventListener = function(object, fun) {var args = Array.prototype.slice.call(arguments).slice(2);return function(event) {return fun.apply(object, [event || window.event].concat(args));}}var CurrentStyle = function(element) {return element.currentStyle|| document.defaultView.getComputedStyle(element, null);}function addEventHandler(oTarget, sEventType, fnHandler) {if (oTarget.addEventListener) {oTarget.addEventListener(sEventType, fnHandler, false);} else if (oTarget.attachEvent) {oTarget.attachEvent("on" + sEventType, fnHandler);} else {oTarget["on" + sEventType] = fnHandler;}};function removeEventHandler(oTarget, sEventType, fnHandler) {if (oTarget.removeEventListener) {oTarget.removeEventListener(sEventType, fnHandler, false);} else if (oTarget.detachEvent) {oTarget.detachEvent("on" + sEventType, fnHandler);} else {oTarget["on" + sEventType] = null;}}; // 拖放程序var Drag = Class.create();Drag.prototype = { // 拖放对象initialize : function(drag, options) {this.Drag = $(drag);// 拖放对象this._x = this._y = 0;// 记录鼠标相对拖放对象的位置this._marginLeft = this._marginTop = 0;// 记录margin //事件对象(用于绑定移除事件)this._fM = BindAsEventListener(this, this.Move);this._fS = Bind(this, this.Stop);this.SetOptions(options);this.Limit = !!this.options.Limit;this.mxLeft = parseInt(this.options.mxLeft);this.mxRight = parseInt(this.options.mxRight);this.mxTop = parseInt(this.options.mxTop);this.mxBottom = parseInt(this.options.mxBottom);this.LockX = !!this.options.LockX;this.LockY = !!this.options.LockY;this.Lock = !!this.options.Lock;this.onStart = this.options.onStart;this.onMove = this.options.onMove;this.onStop = this.options.onStop;this._Handle = $(this.options.Handle) || this.Drag;this._mxContainer = $(this.options.mxContainer) || null; // setZB("bgDiv","div");this.Drag.style.position = "absolute"; // 透明if (isIE && !!this.options.Transparent) { // 填充拖放对象with (this._Handle.appendChild(document.createElement("div")).style) {width = height = "100%";backgroundColor = "#fff";filter = "alpha(opacity:0)";}} // 修正范围this.Repair();addEventHandler(this._Handle, "mousedown", BindAsEventListener(this,this.Start));}, // 设置默认属性SetOptions : function(options) {this.options = {// 默认值Handle : "",// 设置触发对象（不设置则使用拖放对象）Limit : false,// 是否设置范围限制(为true时下面参数有用,可以是负数)mxLeft : 0,// 左边限制mxRight : 9999,// 右边限制mxTop : 0,// 上边限制mxBottom : 9999,// 下边限制mxContainer : "",// 指定限制在容器内LockX : false,// 是否锁定水平方向拖放LockY : false,// 是否锁定垂直方向拖放Lock : false,// 是否锁定Transparent : false,// 是否透明onStart : function() {},// 开始移动时执行onMove : function() {},// 移动时执行onStop : function() {}// 结束移动时执行};Extend(this.options, options || {});}, // 准备拖动Start : function(oEvent) {if (this.Lock) {return;}this.Repair(); // 记录鼠标相对拖放对象的位置this._x = oEvent.clientX - this.Drag.offsetLeft;this._y = oEvent.clientY - this.Drag.offsetTop; // 记录marginthis._marginLeft = parseInt(CurrentStyle(this.Drag).marginLeft) || 0;this._marginTop = parseInt(CurrentStyle(this.Drag).marginTop) || 0; // mousemove时移动// mouseup时停止addEventHandler(document, "mousemove", this._fM);addEventHandler(document, "mouseup", this._fS);if (isIE) { // 焦点丢失addEventHandler(this._Handle, "losecapture", this._fS); // 设置鼠标捕获this._Handle.setCapture();} else { // 焦点丢失addEventHandler(window, "blur", this._fS); // 阻止默认动作oEvent.preventDefault();}; // 附加程序this.onStart();}, // 修正范围Repair : function() {if (this.Limit) { // 修正错误范围参数this.mxRight = Math.max(this.mxRight, this.mxLeft+ this.Drag.offsetWidth);this.mxBottom = Math.max(this.mxBottom, this.mxTop+ this.Drag.offsetHeight); // 如果有容器必须设置position为relative来相对定位，并在获取offset之前设置!this._mxContainer|| CurrentStyle(this._mxContainer).position == "relative"|| (this._mxContainer.style.position = "relative");}}, // 拖动Move : function(oEvent) { // 判断是否锁定if (this.Lock) {this.Stop();return;}; // 清除选择window.getSelection? window.getSelection().removeAllRanges(): document.selection.empty(); // 设置移动参数var iLeft = oEvent.clientX - this._x, iTop = oEvent.clientY - this._y; // 设置范围限制if (this.Limit) { // 设置范围参数var mxLeft = this.mxLeft, mxRight = this.mxRight, mxTop = this.mxTop, mxBottom = this.mxBottom; // 如果设置了容器，再修正范围参数marginif (!!this._mxContainer) {mxLeft = Math.max(mxLeft, 0);mxTop = Math.max(mxTop, 0);mxRight = Math.min(mxRight, this._mxContainer.clientWidth);mxBottom = Math.min(mxBottom, this._mxContainer.clientHeight);}; // 修正移动参数iLeft = Math.max(Math.min(iLeft, mxRight - this.Drag.offsetWidth),mxLeft);iTop = Math.max(Math.min(iTop, mxBottom - this.Drag.offsetHeight),mxTop);} // 设置位置，并修正if (!this.LockX) {this.Drag.style.left = iLeft - this._marginLeft + "px";}if (!this.LockY) {this.Drag.style.top = iTop - this._marginTop + "px";} // 附加程序this.onMove();}, // 停止拖动Stop : function() { // 移除事件removeEventHandler(document, "mousemove", this._fM);removeEventHandler(document, "mouseup", this._fS);if (isIE) {removeEventHandler(this._Handle, "losecapture", this._fS);this._Handle.releaseCapture();} else {removeEventHandler(window, "blur", this._fS);}; // 附加程序this.onStop();}};}}}?