关于窗体的移动范围

Question

（以下内容都基于J2SE  1.5）  
我现在有一个普通矩形窗口，我希望能让此窗口只能在一个我设定好的矩形区域内移动。  
 
1.窗口的每条边都不能超出矩形区域的边  
2.在双击该窗口最大化时，该窗口的最大化面积只能是该矩形区域的大小  
3.实现该窗口的透明化（就是说只能看见窗口的边框和顶部的窗口栏，中间部分是矩形区域的内容）  
 
请各位大侠帮忙啊，小弟不胜感激！！

Answer 1

var x0=0,y0=0,x1=0,y1=0;
var offx=6,offy=6;
var moveable=false;
var hover='orange',normal='slategray';//color;
var index=10000;//z-index;
//开始拖动;
function startDrag(obj)
{
        if(event.button==1)
        {
                //锁定标题栏;
                obj.setCapture();
                //定义对象;
                var win = obj.parentNode;
                var sha = win.nextSibling;
                //记录鼠标和层位置;
                x0 = event.clientX;
                y0 = event.clientY;
                x1 = parseInt(win.style.left);
                y1 = parseInt(win.style.top);
                //记录颜色;
                normal = obj.style.backgroundColor;
                //改变风格;
                obj.style.backgroundColor = hover;
                win.style.borderColor = hover;
                obj.nextSibling.style.color = hover;
                sha.style.left = x1 + offx;
                sha.style.top  = y1 + offy;
                moveable = true;
        }
}
//拖动;
function drag(obj)
{
        if(moveable)
        {
                var win = obj.parentNode;
                var sha = win.nextSibling;
                win.style.left = x1 + event.clientX - x0;
                win.style.top  = y1 + event.clientY - y0;
                sha.style.left = parseInt(win.style.left) + offx;
                sha.style.top  = parseInt(win.style.top) + offy;
        }
}
//停止拖动;
function stopDrag(obj)
{
        if(moveable)
        {
                var win = obj.parentNode;
                var sha = win.nextSibling;
                var msg = obj.nextSibling;
                win.style.borderColor     = normal;
                obj.style.backgroundColor = normal;
                msg.style.color           = normal;
                sha.style.left = obj.parentNode.style.left;
                sha.style.top  = obj.parentNode.style.top;
                obj.releaseCapture();
                moveable = false;
        }
}//最小化;
function min(obj)
{
        var win = obj.parentNode.parentNode;
        var sha = win.nextSibling;
        var tit = obj.parentNode;
        var msg = tit.nextSibling;
        var flg = msg.style.display=="none";
        if(flg)
        {
                win.style.height  = parseInt(msg.style.height) + parseInt(tit.style.height) + 2*2;
                sha.style.height  = win.style.height;
                msg.style.display = "block";
                obj.innerHTML = "0";
        }
        else
        {
                win.style.height  = parseInt(tit.style.height) + 2*2;
                sha.style.height  = win.style.height;
                obj.innerHTML = "2";
                msg.style.display = "none";
        }
}
//创建一个对象;
function xWin(id,w,h,l,t,tit,msg)
{
        index = index+2;
        this.id      = id;
        this.width   = w;
        this.height  = h;
        this.left    = l;
        this.top     = t;
        this.zIndex  = index;
        this.title   = tit;
        this.message = msg;
        this.obj     = null;
        this.bulid   = bulid;
        this.bulid();
}
<div id=xMsg" id="" width="" height="" left="" top+"" ></div> function initialize()
{
        var a = new xWin("1",160,200,200,200,"Message","xWin <br> A Cool Pop Div Window<br>Version:1.0<br>2002-8-13");
 }

Answer 2

这个好象是javascrip啊能不能直接利用j2se中的东西来做呢？？