<!DOCTYPE>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>拖拽库</title>
<style type="text/css">
div,h2,p{margin:0;padding:0;}
body{font:14px/1.5 arial;}
#box{width:100px;height:100px;background:#fef4eb;padding:5px;margin:50px;border:1px solid #f60;}
#box .title{height:25px;background:#f60;}
#box2{width:100px;height:100px;background:#fef4eb;padding:5px;margin:100px;border:1px solid #f60;}
#box2 .title{height:25px;background:#f60;}
#tool{margin-bottom:10px;}
</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:true});
//
//
// var oBox2 = document.getElementById("box2");
// var oTitle2 = oBox2.getElementsByTagName("h2")[0];
// var oSpan2 = document.getElementsByTagName("span")[0];
// var oDrag2 = new Drag(oBox2, {handle:oTitle2, limit:true});
//
// var aInput = document.getElementsByTagName("input");
//
// //锁定范围接口
// aInput[0].onclick = function (){
// oDrag.limit = !oDrag.limit;
// oDrag2.limit = !oDrag2.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;
// oDrag2.lockX = !oDrag2.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;
// oDrag2.lockY = !oDrag2.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;
// oDrag2.lock = !oDrag2.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
// };
//
// //结束拖拽时方法
// oDrag.onStop = function () {
// oSpan.innerHTML = "结束拖拽了"
// };
// };
//应用 class模式
window.onload = function (){
for(var i = 0; i < document.getElementsByClassName("aaa").length; i++){
// var oBox = ;
new Drag(document.getElementsByClassName("aaa")[i], {handle: document.getElementsByClassName("aaa")[i], limit:true});
}
};
</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" class="aaa">
<h2 class="title">我是第一个模块</h2>
</div>
<div id="box2" class="aaa">
<h2 class="title">我是第二个模块</h2>
</div>
</body>
</html>