/* Objektbeweger
 * (c) 2002 Ulrich Kritzner
 * Die Verwendung dieses Scripts in kommerziellen Seiten ist kostenpflichtig
 */

var mausx=0,mausy=0,ux=0,uy=0;
var moveobjects=new Array();
var moveattributes=new Array();
var currentObj=-1;
var zIndex=0;
var eventhandler=0;


/* Ereignishandler setzen ------------------------------------------- */
function SetMoveEventHandler(handler)
{
  eventhandler=handler;
}


/* extra fuer den Konqueror: Extraktion einer Zahl aus
   einer Zeichenkette, die eine Einheit enthaelt (px) --------------- */
function GetInt(s)
{
  var i,ret=0,c,z;
  if (typeof(s)=="string")
  {
    for (i=0;i<s.length;i++)
    {
      z=s.charAt(i);
      c=parseInt(z);
      if (isNaN(c)||((z!="0")&&(c==0)))
        return ret;
      ret*=10;
      ret+=c;
    }
  }
  else
    ret=parseInt(s);
  return ret;
}


/* fuegt ein Objekt in das Array der zu verwaltenden Elemente ein --- */
function AddMoveObject(objname,xp,yp,handlewidth,handleheight,width,height)
{
  var i;
  i=moveobjects.length;
  if (document.all)                    /* MSIE, Konqueror, Opera: --- */
    moveobjects[i]=eval("document.all."+objname+".style");
  else                                               /* Netscape: --- */
  {
    if (typeof(document.getElementById)=="function")
                                                    /* Netscape6: --- */
      moveobjects[i]=document.getElementById(objname).style;
    else                                            /* Netscape4: --- */
      moveobjects[i]=eval("document."+objname);
  }
  moveobjects[i].zIndex=zIndex+i+1;
  moveobjects[i].width=width;
  moveobjects[i].height=height;
  moveattributes[i]=new Object();
  moveattributes[i].x=GetInt(moveobjects[i].left);
  moveattributes[i].y=GetInt(moveobjects[i].top);
  moveattributes[i].width=moveobjects[i].width;
  moveattributes[i].height=moveobjects[i].height;
  moveattributes[i].xp=xp;
  moveattributes[i].yp=yp;
  moveattributes[i].handlewidth=handlewidth;
  moveattributes[i].handleheight=handleheight;
  moveattributes[i].xd=handlewidth/2;
  moveattributes[i].yd=handleheight/2;
  moveobjects.length=i+1;
}


/* Objekt ueber das Dokument ziehen --------------------------------- */
function MouseAction()
{
  if (currentObj<0)
    return;
  moveattributes[currentObj].x=mausx-moveattributes[currentObj].xd-moveattributes[currentObj].xp;
  moveattributes[currentObj].y=mausy-moveattributes[currentObj].yd-moveattributes[currentObj].yp;
  moveobjects[currentObj].left=moveattributes[currentObj].x;
  moveobjects[currentObj].top=moveattributes[currentObj].y;
}


/* Objekt-Kaskade --------------------------------------------------- */
function Cascade(xbase,ybase,xdiff,ydiff)
{
  var i;
  currentObj=-1;
  if (typeof(eventhandler)=="function")
  {
    eventhandler(currentObj);
  }
  for (i=0;i<moveobjects.length;i++)
  {
    moveattributes[i].x=xbase+(moveobjects[i].zIndex-zIndex-1)*xdiff;
    moveattributes[i].y=ybase+(moveobjects[i].zIndex-zIndex-1)*ydiff;
    moveobjects[i].left=moveattributes[i].x;
    moveobjects[i].top=moveattributes[i].y;
  }
}


/* Objekt zeigen ---------------------------------------------------- */
function Show(num)
{
  var i,z=zIndex;
  currentObj=-1;
  if (typeof(eventhandler)=="function")
  {
    eventhandler(currentObj);
  }
  if ((num<0)||(num>=moveobjects.length))
    return;
  z=moveobjects[num].zIndex;  
  for (i=0;i<moveobjects.length;i++)
  {
    if ((moveobjects[i].zIndex>z)&&(i!=num))
      moveobjects[i].zIndex--;
  }
  moveobjects[num].zIndex=zIndex+moveobjects.length;
}


/* Objekt aktivieren ------------------------------------------------ */
function Activate(num)
{
  var i,z=zIndex;
  currentObj=-1;
  if ((num<0)||(num>=moveobjects.length))
    return;
  currentObj=num;
  if (typeof(eventhandler)=="function")
  {
    eventhandler(currentObj);
  }
  z=moveobjects[currentObj].zIndex;  
  for (i=0;i<moveobjects.length;i++)
  {
    if ((moveobjects[i].zIndex>z)&&(i!=currentObj))
      moveobjects[i].zIndex--;
  }
  moveobjects[currentObj].zIndex=zIndex+moveobjects.length;
}


/* Objekt anfassen -------------------------------------------------- */
function MouseActivate()
{
  var i,x,y,z=zIndex;
  currentObj=-1;
  for (i=0;i<moveobjects.length;i++)
  {
    moveattributes[i].x=GetInt(moveobjects[i].left);
    moveattributes[i].y=GetInt(moveobjects[i].top);
    x=mausx-moveattributes[i].x-moveattributes[i].xp;
    y=mausy-moveattributes[i].y-moveattributes[i].yp;
    if ((x>0)&&(y>0)&&(x<moveattributes[i].handlewidth)&&
        (y<moveattributes[i].handleheight)&&(moveobjects[i].zIndex>z))
    {
      currentObj=i;
      z=moveobjects[currentObj].zIndex;  
    }
  }
  if (typeof(eventhandler)=="function")
  {
    eventhandler(currentObj);
  }
  if (currentObj<0)
    return;
  for (i=0;i<moveobjects.length;i++)
  {
    if ((moveobjects[i].zIndex>z)&&(i!=currentObj))
      moveobjects[i].zIndex--;
  }
  moveobjects[currentObj].zIndex=zIndex+moveobjects.length;
  MouseAction();
}


/* Objekt loslassen ------------------------------------------------- */
function MouseDeActivate()
{
  MouseAction();
  currentObj=-1;
  if (typeof(eventhandler)=="function")
  {
    eventhandler(currentObj);
  }
}


/* Mausereignis auswerten ------------------------------------------- */
function MouseEvent(event)
{
  if (typeof(event)!="object")                         /* kein event? */
    return;
  if (event.type=="mouseup")
  {
    if (document.all)                                /* MSIE: ------- */
    {
      if (event.button>1)                      /* nur linke Maustaste */
        return;
    }
    else                                             /* Netscape: --- */
    {
      if (event.which>1)                       /* nur linke Maustaste */
      {
        return;
      }
    }
  }
  if (document.all)                                  /* MSIE: ------- */
  {
    mausx=event.clientX;
    mausy=event.clientY;
    if (document.body.scrollLeft)
      mausx+=document.body.scrollLeft;
    if (document.body.scrollTop)
      mausy+=document.body.scrollTop;
  }
  else                                               /* Netscape: --- */
  {
    mausx=event.pageX;
    mausy=event.pageY;
  }
  if (event.type=="mousemove")
    MouseAction();
  if (event.type=="mouseup")
  {
    if ((ux==mausx)&&(uy==mausy))
      return;
    ux=mausx;
    uy=mausy;
    if (currentObj<0)
      MouseActivate();
    else
      MouseDeActivate();
  }
}


/* Ereignisroutinen zuweisen ---------------------------------------- */
function MouseInit(zIndexBase)
{
  if (zIndexBase)
    zIndex=zIndexBase;
  if (document.all)                    /* MSIE, Konqueror, Opera: --- */
  {
    window.onmousemove=MouseEvent;
    window.onmouseup=MouseEvent;
  }
  else                                               /* Netscape: --- */
  {
    if (typeof(document.addEventListener)=="function")
    {                                               /* Netscape6: --- */
      document.addEventListener("mousemove",MouseEvent,true);
      document.addEventListener("mouseup",MouseEvent,true);
    }
    else                                            /* Netscape4: --- */
    {
      window.captureEvents(Event.MOUSEMOVE);
      window.captureEvents(Event.MOUSEUP);
      window.onmousemove=MouseEvent;
      window.onmouseup=MouseEvent;
    }
  }
}