Javascript文件
/** * @description 拖放控件 * @author {pangkaiguo} * @date {2013-06-26} */var Drag_isIE = (document.all) ? true : false;var Drag_$ = function(id) { return "string" == typeof id ? document.getElementById(id) : id;};var Drag_Class = { create : function() { return function() { this.initialize.apply(this, arguments); } }}var Drag_Extend = function(destination, source) { for (var property in source) { destination[property] = source[property]; }}var Drag_Bind = function(object, fun) { return function() { return fun.apply(object, arguments); }}var Drag_BindAsEventListener = function(object, fun) { return function(event) { return fun.call(object, (event || window.event)); }}var Drag_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 = Drag_Class.create();Drag.prototype = { //拖放对象 initialize : function(drag, options) { this.Drag = Drag_$(drag); //拖放对象 this._x = this._y = 0; //记录鼠标相对拖放对象的位置 this._marginLeft = this._marginTop = 0; //记录margin //事件对象(用于绑定移除事件) this._fM = Drag_BindAsEventListener(this, this.Move); this._fS = Drag_Bind(this, this.Stop); this.SetOptions(options); this.Limit = !!this.options.Limit; this.mxLeft = parseInt(this.options.mxLeft); this.mxRight = parseInt(this.options.mxRight); this.mxTop = parseInt(this.options.mxTop); this.mxBottom = parseInt(this.options.mxBottom); this.LockX = !!this.options.LockX; this.LockY = !!this.options.LockY; this.Lock = !!this.options.Lock; this.onStart = this.options.onStart; this.onMove = this.options.onMove; this.onStop = this.options.onStop; this._Handle = Drag_$(this.options.Handle) || this.Drag; this._mxContainer = Drag_$(this.options.mxContainer) || null; this.Drag.style.position = "absolute"; //透明 if (Drag_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)"; } } addEventHandler(this._Handle, "mousedown", Drag_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 }; Drag_Extend(this.options, options || {}); }, //准备拖动 Start : function(oEvent) { if (this.Lock) { return; } 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 || Drag_CurrentStyle(this._mxContainer).position == "relative" || (this._mxContainer.style.position = "relative"); } //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margin this._marginLeft = parseInt(Drag_CurrentStyle(this.Drag).marginLeft) || 0; this._marginTop = parseInt(Drag_CurrentStyle(this.Drag).marginTop) || 0; //mousemove时移动 mouseup时停止 addEventHandler(document, "mousemove", this._fM); addEventHandler(document, "mouseup", this._fS); if (Drag_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(); }, //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 if (!!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margin 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 (Drag_isIE) { removeEventHandler(this._Handle, "losecapture", this._fS); this._Handle.releaseCapture(); } else { removeEventHandler(window, "blur", this._fS); }; //附加程序 this.onStop(); }};
HTML文件
拖放状态：未开始