/* Nifty Corners Cube - rounded corners with CSS and Javascript
Copyright 2006 Alessandro Fulciniti (a.fulciniti@html.it)

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/

var niftyOk = (document.getElementById && document.createElement && Array.prototype.push);
var niftyCss = false;

String.prototype.find=function(what)
{
  return(this.indexOf(what)>=0 ? true : false);
}

var oldonload=window.onload;
if(typeof(NiftyLoad)!='function') 
  NiftyLoad=function(){};
if(typeof(oldonload)=='function')
  window.onload=function(){oldonload();AddCss();NiftyLoad()};
else
  window.onload=function(){AddCss();NiftyLoad()};

function AddCss()
{
  niftyCss=true;
  var l=CreateEl("link");
  l.setAttribute("type","text/css");
  l.setAttribute("rel","stylesheet");
  l.setAttribute("href","css/corners.css");
  l.setAttribute("media","screen");
  document.getElementsByTagName("head")[0].appendChild(l);
}

function Nifty(selector,options)
{
  if(niftyOk==false) 
    return;
  if(niftyCss==false) 
    AddCss();
  var i,v=selector.split(","),h=0;
  if(options==null) 
    options="";
  if(options.find("fixed-height"))
    h=getElementsBySelector(v[0])[0].offsetHeight;
  for(i=0;i<v.length;i++)
    Rounded(v[i],options);
  if(options.find("height")) 
    SameHeight(selector,h);
}

function Rounded(selector,options)
{
  var i,top="",bottom="",v=new Array();
  if(options!="")
  {
    options=options.replace("left","tl bl");
    options=options.replace("right","tr br");
    options=options.replace("top","tr tl");
    options=options.replace("bottom","br bl");
    options=options.replace("transparent","alias");
    if(options.find("tl"))
    {
      top="both";
      if(!options.find("tr")) 
        top="left";
    }
    else if(options.find("tr")) 
      top="right";
    if(options.find("bl"))
    {
      bottom="both";
      if(!options.find("br")) 
        bottom="left";
    }
    else if(options.find("br")) 
      bottom="right";
  }
  if(top=="" && bottom=="" && !options.find("none"))
  {
    top="both";bottom="both";
  }
  v=getElementsBySelector(selector);
  for(i=0;i<v.length;i++)
  {
    FixIE(v[i]);
    if(top!="") 
      AddTop(v[i],top,options);
    if(bottom!="") 
      AddBottom(v[i],bottom,options);
  }
}

function AddTop(el,side,options)
{
  var d=CreateEl("b"),lim=4,border="",p,i,btype="r",bk,color;
  d.style.marginLeft="-"+getPadding(el,"Left")+"px";
  d.style.marginRight="-"+getPadding(el,"Right")+"px";
  if(options.find("alias") || (color=getBk(el))=="transparent")
  {
    color="transparent";bk="transparent"; border=getParentBk(el);btype="t";
  }
  else
  {
    bk=getParentBk(el); border=Mix(color,bk);
  }
  d.style.background=bk;
  d.className="niftycorners";
  p=getPadding(el,"Top");
  if(options.find("small"))
  {
    d.style.marginBottom=(p-2)+"px";
    btype+="s"; lim=2;
  }
  else if(options.find("big"))
  {
    d.style.marginBottom=(p-10)+"px";
    btype+="b"; lim=8;
  }
  else d.style.marginBottom=(p-5)+"px";
  for(i=1;i<=lim;i++)
      d.appendChild(CreateStrip(i,side,color,border,btype));
  el.style.paddingTop="0";
  el.insertBefore(d,el.firstChild);
}

function AddBottom(el,side,options)
{
  var d=CreateEl("b"),lim=4,border="",p,i,btype="r",bk,color;
  d.style.marginLeft="-"+getPadding(el,"Left")+"px";
  d.style.marginRight="-"+getPadding(el,"Right")+"px";
  if(options.find("alias") || (color=getBk(el))=="transparent")
  {
    color="transparent";bk="transparent"; border=getParentBk(el);btype="t";
  }
  else
  {
    bk=getParentBk(el); border=Mix(color,bk);
  }
  d.style.background=bk;
  d.className="niftycorners";
  p=getPadding(el,"Bottom");
  if(options.find("small"))
  {
    d.style.marginTop=(p-2)+"px";
    btype+="s"; lim=2;
  }
  else if(options.find("big"))
  {
    d.style.marginTop=(p-10)+"px";
    btype+="b"; lim=8;
  }
  else d.style.marginTop=(p-5)+"px";
  for(i=lim;i>0;i--)
    d.appendChild(CreateStrip(i,side,color,border,btype));
  el.style.paddingBottom=0;
  el.appendChild(d);
}

function CreateStrip(index,side,color,border,btype)
{
  var x=CreateEl("b");
  x.className=btype+index;
  x.style.backgroundColor=color;
  x.style.borderColor=border;
  if(side=="left")
  {
    x.style.borderRightWidth="0";
    x.style.marginRight="0";
  }
  else if(side=="right")
  {
    x.style.borderLeftWidth="0";
    x.style.marginLeft="0";
  }
  return(x);
}

function CreateEl(x)
{
  return(document.createElement(x));
}

function FixIE(el)
{
  if(el.currentStyle!=null && el.currentStyle.hasLayout!=null && el.currentStyle.hasLayout==false)
    el.style.display="inline-block";
}

function SameHeight(selector,maxh)
{
  var i,v=selector.split(","),t,j,els=[],gap;
  for(i=0;i<v.length;i++)
  {
    t=getElementsBySelector(v[i]);
    els=els.concat(t);
  }
  for(i=0;i<els.length;i++)
  {
    if(els[i].offsetHeight>maxh) 
      maxh=els[i].offsetHeight;
    els[i].style.height="auto";
  }
  for(i=0;i<els.length;i++)
  {
    gap=maxh-els[i].offsetHeight;
    if(gap>0)
    {
      t=CreateEl("b");t.className="niftyfill";t.style.height=gap+"px";
      nc=els[i].lastChild;
      if(nc.className=="niftycorners")
        els[i].insertBefore(t,nc);
      else 
        els[i].appendChild(t);
    }
  }
}

function getElementsBySelector(selector)
{
  var i,j,selid="",selclass="",tag=selector,tag2="",v2,k,f,a,s=[],objlist=[],c;
  if(selector.find("#"))
  { 
    //id selector like "tag#id"
    if(selector.find(" "))
    {  
      //descendant selector like "tag#id tag"
      s=selector.split(" ");
      var fs=s[0].split("#");
      if(fs.length==1) 
        return(objlist);
      f=document.getElementById(fs[1]);
      if(f)
      {
        v=f.getElementsByTagName(s[1]);
        for(i=0;i<v.length;i++) 
          objlist.push(v[i]);
      }
      return(objlist);
    }
    else
    {
      s=selector.split("#");
      tag=s[0];
      selid=s[1];
      if(selid!="")
      {
        f=document.getElementById(selid);
        if(f) 
          objlist.push(f);
        return(objlist);
      }
    }
  }
  if(selector.find("."))
  {
    //class selector like "tag.class"
    s=selector.split(".");
    tag=s[0];
    selclass=s[1];
    if(selclass.find(" "))
    {   
      //descendant selector like tag1.classname tag2
      s=selclass.split(" ");
      selclass=s[0];
      tag2=s[1];
    }
  }
  var v=document.getElementsByTagName(tag);  // tag selector like "tag"
  if(selclass=="")
  {
    for(i=0;i<v.length;i++) 
      objlist.push(v[i]);
    return(objlist);
  }
  for(i=0;i<v.length;i++)
  {
    c=v[i].className.split(" ");
    for(j=0;j<c.length;j++)
    {
      if(c[j]==selclass)
      {
        if(tag2=="") 
          objlist.push(v[i]);
        else
        {
          v2=v[i].getElementsByTagName(tag2);
          for(k=0;k<v2.length;k++) 
            objlist.push(v2[k]);
        }
      }
    }
  }
  return(objlist);
}

function getParentBk(x)
{
  var el=x.parentNode,c;
  while(el.tagName.toUpperCase()!="HTML" && (c=getBk(el))=="transparent")
    el=el.parentNode;
  if(c=="transparent") 
    c="#FFFFFF";
  return(c);
}

function getBk(x)
{
  var c=getStyleProp(x,"backgroundColor");
  if(c==null || c=="transparent" || c.find("rgba(0, 0, 0, 0)"))
    return("transparent");
  if(c.find("rgb")) 
    c=rgb2hex(c);
  return(c);
}

function getPadding(x,side)
{
  var p=getStyleProp(x,"padding"+side);
  if(p==null || !p.find("px")) 
    return(0);
  return(parseInt(p));
}

function getStyleProp(x,prop)
{
  if(x.currentStyle)
    return(x.currentStyle[prop]);
  if(document.defaultView.getComputedStyle)
    return(document.defaultView.getComputedStyle(x,'')[prop]);
  return(null);
}

function rgb2hex(value)
{
  var hex="",v,h,i;
  var regexp=/([0-9]+)[, ]+([0-9]+)[, ]+([0-9]+)/;
  var h=regexp.exec(value);
  for(i=1;i<4;i++)
  {
    v=parseInt(h[i]).toString(16);
    if(v.length==1) 
      hex+="0"+v;
    else 
      hex+=v;
  }
  return("#"+hex);
}

function Mix(c1,c2)
{
  var i,step1,step2,x,y,r=new Array(3);
  if(c1.length==4)
    step1=1;
  else 
    step1=2;
  if(c2.length==4) 
    step2=1;
  else 
    step2=2;
  for(i=0;i<3;i++)
  {
    x=parseInt(c1.substr(1+step1*i,step1),16);
    if(step1==1) 
      x=16*x+x;
    y=parseInt(c2.substr(1+step2*i,step2),16);
    if(step2==1) 
      y=16*y+y;
    r[i]=Math.floor((x*50+y*50)/100);
    r[i]=r[i].toString(16);
    if(r[i].length==1) 
      r[i]="0"+r[i];
  }
  return("#"+r[0]+r[1]+r[2]);
}