drag.js

java版源代码,里面包含很多源代码,大家可以看看.

var theobject = null; 	//This gets a value as soon as a resize start

function resizeObject() {
	this.el  = null; //pointer to the object
	this.dir  = "";      //type of current resize (n, s, e, w, ne, nw, se, sw)
	this.grabx = null;     //Some useful values
	this.graby = null;
	this.width = null;
	this.height = null;
	this.left = null;
	this.top = null;
}
	
//Find out what kind of resize! Return a string inlcluding the directions
function getDirection(el) {
	var xPos, yPos, offset, dir;
	dir = "";
	xPos = window.event.offsetX;
	yPos = window.event.offsetY;
	offset = 8; //The distance from the edge in pixels
	if (yPos<offset) dir += "n";
	else if (yPos > el.offsetHeight-offset) dir += "s";
	if (xPos<offset) dir += "w";
	else if (xPos > el.offsetWidth-offset) dir += "e";
	return dir;
}

function doDown() {
	var el = getReal(event.srcElement, "className", "resizeMe");
	if (el == null) {
		theobject = null;
		return;
	}		
	dir = getDirection(el);
	if (dir == "") return;
	theobject = new resizeObject();
	theobject.el = el;
	theobject.dir = dir;
	theobject.grabx = window.event.clientX;
	theobject.graby = window.event.clientY;
	theobject.width = el.offsetWidth;
	theobject.height = el.offsetHeight;
	theobject.left = el.offsetLeft;
	theobject.top = el.offsetTop;
	window.event.returnValue = false;
	window.event.cancelBubble = true;
}

function doUp() {
	if (theobject != null) {
		theobject = null;
	}
}

function doMove() {
	var el, xPos, yPos, str, xMin, yMin;
	xMin = 8; //The smallest width possible
	yMin = 8; //             height

	el = getReal(event.srcElement, "className", "resizeMe");

	if (el.className == "resizeMe") {
		str = getDirection(el);
	//Fix the cursor	
		if (str == "") str = "default";
		else str += "-resize";
		el.style.cursor = str;
	}
	
//Dragging starts here
	if(theobject != null) {
	 
		if (dir.indexOf("e") != -1)
			theobject.el.style.width = Math.max(xMin, theobject.width + window.event.clientX - theobject.grabx);
			if(eSs)
	 		theobject.el.style.height =  theobject.el.style.width.replace("px","")/eS;
	 		
		if (dir.indexOf("s") != -1)
			 
			theobject.el.style.height = Math.max(yMin, theobject.height + window.event.clientY - theobject.graby);		
			if(eSs)
			theobject.el.style.width =theobject.el.style.height.replace("px","")*eS
			
		if (dir.indexOf("w") != -1) {
			theobject.el.style.left = Math.min(theobject.left + window.event.clientX - theobject.grabx, theobject.left + theobject.width - xMin);
			theobject.el.style.width = Math.max(xMin, theobject.width - window.event.clientX + theobject.grabx);
		}
		if (dir.indexOf("n") != -1) {
			/*theobject.el.style.top = Math.min(theobject.top + window.event.clientY - theobject.graby, theobject.top + theobject.height - yMin);
			theobject.el.style.height = Math.max(yMin, theobject.height - window.event.clientY + theobject.graby);*/
		}
		window.event.returnValue = false;
		window.event.cancelBubble = true;
		d=0
	} 
}

function getReal(el, type, value) {
	temp = el;
	while ((temp != null) && (temp.tagName != "BODY")) {
		if (eval("temp." + type) == value) {
			el = temp;
			return el;
		}
		temp = temp.parentElement;
	}
	return el;
}

document.onmousedown = doDown;
document.onmouseup   = doUp;
document.onmousemove = doMove;

 
var d=0
function find(qq){
	d=qq
	x=document.body.scrollLeft+event.clientX-d.style.pixelLeft
	y=document.body.scrollTop+event.clientY-d.style.pixelTop
}
function dragit(){
	if(d==0)
			return false
	else{
			if(d.style.pixelLeft>1){d.style.pixelLeft=document.body.scrollLeft+event.clientX-x}else{d.style.pixelLeft=2}
		 	if(d.style.pixelTop>1){d.style.pixelTop=document.body.scrollTop+event.clientY-y}else{d.style.pixelTop=2}
		}
}

var eS
var eSs
var IntX
var IntY
var DiyW
var DiyH
function SetS(intX,intY,oType)
{
	IntX=intX
	IntY=intY
 	document.all.outerRasiedDiv.style.left=10 ;
 	document.all.outerRasiedDiv.style.top=10;
 	document.all.outerRasiedDiv.style.width=intX
	document.all.outerRasiedDiv.style.height=intY
	eS=intX/intY	
	if(oType)
	{
		eSs=true;
	}	
}

function ChangColor(oColor)
{
	document.all.outerRasiedDiv.style.background=oColor; 
}
var oInterval = "";
function fnStartInterval(){
oInterval = window.setInterval("fnRecycle()",1000);
}
var blChang=true;
function fnRecycle(){
	
	if(blChang)
 	{
 		document.all.outerRasiedDiv.style.borderStyle="dashed";
 		blChang=false
 	}
 	else 
  	{
  		document.all.outerRasiedDiv.style.borderStyle="dotted";
  		blChang=true;
	}
 
}