/*************************************************************************
  This code is from Dynamic Web Coding at www.dyn-web.com
  Copyright 2001-4 by Sharon Paine 
  See Terms of Use at www.dyn-web.com/bus/terms.html
  regarding conditions under which you may use this code.
  This notice must be retained in the code as is!
*************************************************************************/

/* 
    dw_scrollObj.js  version date: June 2004 
    contains constructor and basic methods for scrolling layers.
    Use with dw_hoverscroll.js and/or dw_glidescroll.js,
    and for scrollbars: dw_scroll-aux.js and dw_slidebar.js
*/

dw_scrollObjs = {};
dw_scrollObj.speed = 100; // default speed for mouseover scrolling
//  constructor arguments: id of layer containing scrolling layers (clipped layer), id of layer to scroll, 
//	id of table or other element that scrolling content is nested in. 
//	ns6+/moz need that extra container to get width for horizontal scrolling.
//	(not needed for vertical scrolling)
function dw_scrollObj(wnId, lyrId, cntId) {
  this.id = wnId; dw_scrollObjs[this.id] = this;
  this.wnWidth = document.getElementById(wnId).offsetWidth;
  this.wnHeight = document.getElementById(wnId).offsetHeight;
  this.animString = "dw_scrollObjs." + this.id;
  this.load(lyrId, cntId);
}

dw_scrollObj.loadLayer = function(wnId, id, cntId) {
  if ( dw_scrollObjs[wnId] ) dw_scrollObjs[wnId].load(id, cntId);
}

function getScroll() {
var pos;
if (event.wheelDelta >= 120) {
    pos = 20;
} else if (event.wheelDelta <= -120) {
    pos = -20;
}
  return pos;
}

//funkcia upravi poziciu contentu  podla toho kolko sa pohlo koleckom
dw_scrollObj.ScrollWndoLyrPos = function(axis, wn) {
  var nx, ny, pos, posun;
  
  if ( wn.vBarId ) wn.vbar = document.getElementById(wn.vBarId);
  if ( wn.hBarId ) wn.hbar = document.getElementById(wn.hBarId);  

  
  // posunutie sa v smere danej osi
  if (axis == "v") {
    nx = wn.x;
    pos = getScroll();
    ny = wn.y + pos;
    ny = Math.min( Math.max(wn.wnHeight - wn.hg, ny ), 0);
    // nastavenie posunutia scrollbaru
    if(pos < 0) {
 	  posun = Math.round(((-pos/wn.hg) * wn.vbar.trkHt));
 	  posun = - posun;
    } else {
	  posun = Math.round(((pos/wn.hg) * wn.vbar.trkHt));
    }
    
    if(((wn.vbar.offsetTop - posun) <= wn.vbar.maxY) && ((wn.vbar.offsetTop - posun) >= wn.vbar.minY)) {
    
        wn.vbar.style.top = (wn.vbar.offsetTop - posun) + "px";
       
    }
    
  } else {
    ny = wn.y;
    pos = getScroll();
    nx = wn.x + pos;
    nx = Math.min( Math.max(wn.wnWidth - wn.wd, nx ), 0);
    // nastavenie posunutia scrollbaru
    if(pos < 0) {
 	posun = Math.round(((pos/wn.wd) * wn.hbar.trkWd));
    } else {
	posun = Math.round(((pos/wn.wd) * wn.hbar.trkWd));
    }
    
    if(((wn.hbar.offsetLeft - posun) <= wn.hbar.maxX) && ((wn.hbar.offsetLeft - posun) >= wn.hbar.minX)) {
      
        wn.hbar.style.left = (wn.hbar.offsetLeft - posun) + "px";
    
    }
    
  }
  
  wn.shiftTo(document.getElementById(wn.lyrId), nx, ny);
  
}


dw_scrollObj.prototype.load = function(lyrId, cntId) {
  if (!document.getElementById) return;
  var wndo, lyr, position;
  if (this.lyrId) {
    lyr = document.getElementById(this.lyrId);
    lyr.style.visibility = "hidden";
  }
  lyr = document.getElementById(lyrId);
  wndo = document.getElementById(this.id);
  lyr.style.top = this.y = 0; lyr.style.left = this.x = 0;
  this.maxY = (lyr.offsetHeight - wndo.offsetHeight > 0)? lyr.offsetHeight - wndo.offsetHeight: 0;
  this.wd = cntId ? document.getElementById(cntId).offsetWidth: lyr.offsetWidth;
  this.hg = cntId ? document.getElementById(cntId).offsetHeight: lyr.offsetHeight;
  this.maxX = (this.wd - wndo.offsetWidth > 0)? this.wd - wndo.offsetWidth: 0;
  this.lyrId = lyrId; // hold id of currently visible layer
  lyr.style.visibility = "visible";
  this.on_load(); this.ready = true;
}

dw_scrollObj.prototype.on_load = function() {}  

dw_scrollObj.prototype.shiftTo = function(lyr, x, y) {
  lyr.style.left = (this.x = x) + "px"; 
  lyr.style.top = (this.y = y) + "px";
}

// remove layers from table for ns6+/mozilla (needed for scrolling inside tables)
dw_scrollObj.GeckoTableBugFix = function() {
  /* vyremovane lebo to robilo v mozille cudesny error ;) (aj v NS)
  var i, wndo, holderId, holder, x, y;
	if ( navigator.userAgent.indexOf("Gecko") > -1 && navigator.userAgent.indexOf("Firefox") == -1 ) {
    dw_scrollObj.hold = []; // holds id's of wndo and its container
    for (i=0; arguments[i]; i++) {
      if ( dw_scrollObjs[ arguments[i] ] ) {
        wndo = document.getElementById( arguments[i] );
        holderId = wndo.parentNode.id;
        holder = document.getElementById(holderId);
        document.body.appendChild( holder.removeChild(wndo) );
        wndo.style.zIndex = 1000;
        x = holder.offsetLeft; y = holder.offsetTop;
        wndo.style.left = x + "px"; wndo.style.top = y + "px";
        dw_scrollObj.hold[i] = [ arguments[i], holderId ];
      }
    }
   window.addEventListener("resize", dw_scrollObj.rePositionGecko, true);
  }
  */
}

// ns6+/mozilla need to reposition layers onresize when scrolling inside tables.
dw_scrollObj.rePositionGecko = function() {
  var i, wndo, holder, x, y;
  if (dw_scrollObj.hold) {
    for (i=0; dw_scrollObj.hold[i]; i++) {
      wndo = document.getElementById( dw_scrollObj.hold[i][0] );
      holder = document.getElementById( dw_scrollObj.hold[i][1] );
      x = holder.offsetLeft; y = holder.offsetTop;
      wndo.style.left = x + "px"; wndo.style.top = y + "px";
    }
  }
}