Js層拖動/拖放代碼_層和布局特效

這個很不錯，利用JS拖動一個DIV層，代碼很有修改，和以往的拖放都有點不一樣，研究一下吧。

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" mrc="text/html; charset=gb2312" />
<title>拖放效果_mb5u.com</title>
</head>

<body>

var isIE = (document.all) ? true : false;
// Demo by /
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) {
	return function(event) {
		return fun.call(object, (event || window.event));
	}
}

var CurrentStyle = function(element){
	return element.currentStyle || document.defaultView.getComputedStyle(element, null);
}

// Demo by /
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;
	}
};

//拖放程序
var Drag = Class.create();
Drag.prototype = {
  //拖放對象
  initialize: function(drag, options) {
	this.Drag = $(drag);//拖放對象
	this._x = this._y = 0;//記錄鼠標(biāo)相對拖放對象的位置
	this._marginLeft = this._marginTop = 0;//記錄margin
	//事件對象(用于綁定移除事件)
	this._fM = BindAsEventListener(this, this.Move);
	this._fS = Bind(this, this.Stop);
	
	this.SetOptions(options);
	// Demo by /
	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;
	
	this.Drag.style.position = "absolute";
	//透明
	if(isIE && !!this.options.Transparent){
		//填充拖放對象
		with(this._Handle.appendChild(document.createElement("div")).style){
			width = height = "100%"; backgroundColor = "#fff"; filter = "alpha(opacity:0)"; fontSize = 0;
		}
	}
	//修正范圍
	this.Repair();
	addEventHandler(this._Handle, "mousedown", BindAsEventListener(this, this.Start));
  },
  //設(shè)置默認(rèn)屬性
  SetOptions: function(options) {
	this.options = {//默認(rèn)值
		Handle:			"",//設(shè)置觸發(fā)對象（不設(shè)置則使用拖放對象）
		Limit:			false,//是否設(shè)置范圍限制(為true時下面參數(shù)有用,可以是負(fù)數(shù))
		mxLeft:			0,//左邊限制
		mxRight:		9999,//右邊限制
		mxTop:			0,//上邊限制
		mxBottom:		9999,//下邊限制
		mxContainer:	"",//指定限制在容器內(nèi)
		LockX:			false,//是否鎖定水平方向拖放
		LockY:			false,//是否鎖定垂直方向拖放
		Lock:			false,//是否鎖定
		Transparent:	false,//是否透明
		onStart:		function(){},//開始移動時執(zhí)行
		onMove:			function(){},//移動時執(zhí)行
		onStop:			function(){}//結(jié)束移動時執(zhí)行
	};
	Extend(this.options, options || {});
  },
  //準(zhǔn)備拖動
  Start: function(oEvent) {
	if(this.Lock){ return; }
	this.Repair();
	//記錄鼠標(biāo)相對拖放對象的位置
	this._x = oEvent.clientX - this.Drag.offsetLeft;
	this._y = oEvent.clientY - this.Drag.offsetTop;
	//記錄margin
	this._marginLeft = parseInt(CurrentStyle(this.Drag).marginLeft) || 0;
	this._marginTop = parseInt(CurrentStyle(this.Drag).marginTop) || 0;
	//mousemove時移動 mouseup時停止
	addEventHandler(document, "mousemove", this._fM);
	addEventHandler(document, "mouseup", this._fS);
	if(isIE){
		//焦點丟失
		addEventHandler(this._Handle, "losecapture", this._fS);
		//設(shè)置鼠標(biāo)捕獲
		this._Handle.setCapture();
	}else{
		//焦點丟失
		addEventHandler(window, "blur", this._fS);
		//阻止默認(rèn)動作
		oEvent.preventDefault();
	};
	//附加程序
	this.onStart();
  },
  //修正范圍
  Repair: function() {
	if(this.Limit){
		//修正錯誤范圍參數(shù)
		this.mxRight = Math.max(this.mxRight, this.mxLeft + this.Drag.offsetWidth);
		this.mxBottom = Math.max(this.mxBottom, this.mxTop + this.Drag.offsetHeight);
		//如果有容器必須設(shè)置position為relative或absolute來相對或絕對定位，并在獲取offset之前設(shè)置
		!this._mxContainer || CurrentStyle(this._mxContainer).position == "relative" || CurrentStyle(this._mxContainer).position == "absolute" || (this._mxContainer.style.position = "relative");
	}
  },
  //拖動
  Move: function(oEvent) {
	//判斷是否鎖定
	if(this.Lock){ this.Stop(); return; };
	//清除選擇
	window.getSelection ? window.getSelection().removeAllRanges() : document.selection.empty();
	//設(shè)置移動參數(shù)
	var iLeft = oEvent.clientX - this._x, iTop = oEvent.clientY - this._y;
	//設(shè)置范圍限制
	if(this.Limit){
		//設(shè)置范圍參數(shù)
		var mxLeft = this.mxLeft, mxRight = this.mxRight, mxTop = this.mxTop, mxBottom = this.mxBottom;
		//如果設(shè)置了容器，再修正范圍參數(shù)
		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);
		};
		//修正移動參數(shù)
		iLeft = Math.max(Math.min(iLeft, mxRight - this.Drag.offsetWidth), mxLeft);
		iTop = Math.max(Math.min(iTop, mxBottom - this.Drag.offsetHeight), mxTop);
	}
	//設(shè)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();
  },
  //停止拖動
  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();
  }
};
</script>

$("idReset").onclick = function(){
	drag.Limit = true;
	drag.mxLeft = drag.mxTop = 0;
	drag.mxRight = drag.mxBottom = 9999;
	drag.LockX = drag.LockY = drag.Lock = false;
}

$("idLock").onclick = function(){ drag.Lock = true; }
$("idLockX").onclick = function(){ drag.LockX = true; }
$("idLockY").onclick = function(){ drag.LockY = true; }
$("idLimit").onclick = function(){	 drag.mxRight = drag.mxBottom = 200;drag.Limit = true; }
$("idLimitOff").onclick = function(){ drag.Limit = false; }
</script>

</body>
</html>

所屬頻道：層和布局特效/更新時間：2012-12-07

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