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[网页设计]Drag拖拽库


<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html {margin:0;padding:0;}body{font:14px/1.5 arial;}#box{  width:100px;  height:100px;  padding:5px;  margin:50px;  border:1px solid #f60;  background-color:#000;}#box .title{height:25px;}#tool{margin-bottom:10px; color:#000}</style><script type="text/javascript"> function Drag(){ //初始化 this.initialize.apply(this, arguments)}Drag.prototype = { //初始化 initialize : function (drag, options) {  this.drag = this.$(drag);  this._x = this._y = 0;  this._moveDrag = this.bind(this, this.moveDrag);  this._stopDrag = this.bind(this, this.stopDrag);     this.setOptions(options);     this.handle = this.$(this.options.handle);  this.maxContainer = this.$(this.options.maxContainer);     this.maxTop = Math.max(this.maxContainer.clientHeight, this.maxContainer.scrollHeight) - this.drag.offsetHeight;  this.maxLeft = Math.max(this.maxContainer.clientWidth, this.maxContainer.scrollWidth) - this.drag.offsetWidth;  this.limit = this.options.limit;  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.style.cursor = "move";  this.changeLayout();  this.addHandler(this.handle, "mousedown", this.bind(this, this.startDrag)) }, changeLayout : function () {  this.drag.style.top = this.drag.offsetTop + "px";  this.drag.style.left = this.drag.offsetLeft + "px";  this.drag.style.position = "absolute";  this.drag.style.margin = "0" }, startDrag : function (event) {    var event = event || window.event;  this._x = event.clientX - this.drag.offsetLeft;  this._y = event.clientY - this.drag.offsetTop;  this.addHandler(document, "mousemove", this._moveDrag);  this.addHandler(document, "mouseup", this._stopDrag);  event.preventDefault && event.preventDefault();  this.handle.setCapture && this.handle.setCapture();  this.onStart() }, moveDrag : function (event) {  var event = event || window.event;  var iTop = event.clientY - this._y;  var iLeft = event.clientX - this._x;  if (this.lock) return;  this.limit && (iTop < 0 && (iTop = 0), iLeft < 0 && (iLeft = 0), iTop > this.maxTop && (iTop = this.maxTop), iLeft > this.maxLeft && (iLeft = this.maxLeft));  this.lockY || (this.drag.style.top = iTop + "px");  this.lockX || (this.drag.style.left = iLeft + "px");  event.preventDefault && event.preventDefault();  this.onMove() }, stopDrag : function () {  this.removeHandler(document, "mousemove", this._moveDrag);  this.removeHandler(document, "mouseup", this._stopDrag);  this.handle.releaseCapture && this.handle.releaseCapture();  this.onStop() }, //参数设置 setOptions : function (options) {  this.options =  {   handle:   this.drag, //事件对象   limit:   true, //锁定范围   lock:   false, //锁定位置   lockX:   false, //锁定水平位置   lockY:   false, //锁定垂直位置   maxContainer: document.documentElement || document.body, //指定限制容器   onStart:  function () {}, //开始时回调函数   onMove:   function () {}, //拖拽时回调函数   onStop:   function () {} //停止时回调函数  };  for (var p in options) this.options[p] = options[p] }, //获取id $ : function (id) {  return typeof id === "string" ? document.getElementById(id) : id }, //添加绑定事件 addHandler : function (oElement, sEventType, fnHandler) {  return oElement.addEventListener ? oElement.addEventListener(sEventType, fnHandler, false) : oElement.attachEvent("on" + sEventType, fnHandler) }, //删除绑定事件 removeHandler : function (oElement, sEventType, fnHandler) {  return oElement.removeEventListener ? oElement.removeEventListener(sEventType, fnHandler, false) : oElement.detachEvent("on" + sEventType, fnHandler) }, //绑定事件到对象 bind : function (object, fnHandler) {  return function ()  {   return fnHandler.apply(object, arguments)  } }};//应用window.onload = function (){ var oBox = document.getElementById("box"); var oTitle = oBox.getElementsByTagName("h2")[0]; var oSpan = document.getElementsByTagName("span")[0]; var oDrag = new Drag(oBox, {handle:oTitle, limit:false}); var aInput = document.getElementsByTagName("input"); //锁定范围接口 aInput[0].onclick = function () {  oDrag.limit = !oDrag.limit;  this.value = oDrag.limit ? "取消锁定范围" : "锁定范围" };   //水平锁定接口 aInput[1].onclick = function () {  oDrag.lockX = !oDrag.lockX;  this.value = oDrag.lockX ? "取消水平锁定" : "水平锁定" };   //垂直锁定接口 aInput[2].onclick = function () {  oDrag.lockY = !oDrag.lockY;  this.value = oDrag.lockY ? "取消垂直锁定" : "垂直锁定" };   //锁定位置接口 aInput[3].onclick = function () {  oDrag.lock = !oDrag.lock;  this.value = oDrag.lock ? "取消锁定位置" : "锁定位置" };   //开始拖拽时方法 oDrag.onStart = function () {  oSpan.innerHTML = "开始拖拽" };   //开始拖拽时方法 oDrag.onMove = function () {  oSpan.innerHTML = "left:" + this.drag.offsetLeft + ", top:" + this.drag.offsetTop }; //开始拖拽时方法 oDrag.onStop = function () {  oSpan.innerHTML = "结束拖拽" };};</script></head><body><div id="tool"><input type="button" value="锁定范围" /> <input type="button" value="水平锁定" /> <input type="button" value="垂直锁定" /> <input type="button" value="锁定位置" /></div><p>拖放状态:<span>未开始</span></p><div id="box"> <h2 ></h2></div></body></html>

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