/******************************************************************************
* scroller.js                                                                 *
*                                                                             *
* Copyright 1999 by Mike Hall.                                                *
* Web address: http://www.brainjar.com                                        *
* Last update: March 15, 2000.                                                *
*                                                                             *
* Allows you to create scrolling displays on a page. Multiple scrollers can   *
* be defined, each with it's own parameters and list of items. Item text can  *
* include basic HTML tags, including links and images.                        *
*								                                              *
*******************************************************************************
* MODIFICATION	(23/11/2001)		                                          *
*                                                                             *
* Now works with NS 6 by using new crossbrowserLib : xbStyle.js               *
*                                                                             *
* Note: requires xbStyle.js.                                                  *
******************************************************************************/

/******************************************************************************
/ Scroller constructor.
/*****************************************************************************/

function Scroller(x, y, width, height, border, padding)
{
  this.x = x;
  this.y = y;
  this.width = width;
  this.height = height;
  this.border = border;
  this.padding = padding;

  this.items = new Array();
  this.created = false;

  // Set default colors.

  this.fgColor = "#000000";
  this.bgColor = "#ffffff";
  this.bdColor = "#000000";

  // Set default font.

  this.fontFace = "Arial,Helvetica";
  this.fontSize = "2";

  // Set default scroll timing values.

  this.speed = 50;
  this.pauseTime = 2000;

  // Define methods.

  this.setColors = scrollerSetColors;
  this.setFont = scrollerSetFont;
  this.setSpeed = scrollerSetSpeed;
  this.setPause = scrollersetPause;
  this.addItem = scrollerAddItem;
  this.create = scrollerCreate;
  this.show = scrollerShow;
  this.hide = scrollerHide;
  this.moveTo = scrollerMoveTo;
  this.moveBy = scrollerMoveBy;
  this.getzIndex = scrollerGetzIndex;
  this.setzIndex = scrollerSetzIndex;
  this.stop = scrollerStop;
  this.start = scrollerStart;
}

//*****************************************************************************
// Scroller methods.
//*****************************************************************************

function scrollerSetColors(fgcolor, bgcolor, bdcolor) {

  if (!this.created) {
    this.fgColor = fgcolor;
    this.bgColor = bgcolor;
    this.bdColor = bdcolor;
  }
}

function scrollerSetFont(face, size) {

  if (!this.created) {
    this.fontFace = face;
    this.fontSize = size;
  }
}

function scrollerSetSpeed(pps) {

  if (!this.created)
    this.speed = pps;
}

function scrollersetPause(ms) {

  if (!this.created)
    this.pauseTime = ms;
}

function scrollerAddItem(str) {
  if (!this.created)
    this.items[this.items.length] = str;
}

function scrollerCreate()
{
  var start, end;
  var str;
  var i, j;
  var x, y;

  if (navigator.family != 'nn4' && navigator.family != 'ie4' && !navigator.DOMHTML )
    return;

  // On first scroller, start interval timer.
  if (scrollerList.length == 0)
    setInterval('scrollerGo()', scrollerInterval);

  // Create the scroller only once.
  if (this.created)
    return;
  this.created = true;

  // Copy first item to the end of the list, this lets us scroll from the last
  // defined item to the first without jumping.
  this.items[this.items.length] = this.items[0];

  // Set up HTML code for item text.
  start = '<table border=0'
        + ' cellpadding=' + (this.padding + this.border)
        + ' cellspacing=0'
        + ' width=' + this.width
        + ' height=' + this.height + '>'
        + '<tr><td>'
        + '<font'
        + ' color="' + this.fgColor + '"'
        + ' face="' + this.fontFace + '"'
        + ' size=' + this.fontSize + '>';
  end   = '</font></td></tr></table>';

  // Build the layers.
  if (navigator.family == 'nn4')
  {
    this.baseLayer = new Layer(this.width);
    this.scrollLayer = new Layer(this.width, this.baseLayer);
    this.scrollLayer.visibility = "inherit";
    this.itemLayers = new Array();
    var i;
	for (i = 0; i < this.items.length; i++)
	{
      this.itemLayers[i] = new Layer(this.width, this.scrollLayer);
      this.itemLayers[i].document.open();
      this.itemLayers[i].document.writeln(start + this.items[i] + end);
      this.itemLayers[i].document.close();
      this.itemLayers[i].visibility = "inherit";
    }

    // Set background colors.
	var xbBaseLayer = new xbStyle(this.baseLayer);
	var xbScrollLayer = new xbStyle(this.scrollLayer);

    xbBaseLayer.setBackgroundColor(this.bdColor);
    xbScrollLayer.setBackgroundColor(this.bgColor);
  }
  else if (navigator.family == 'ie4')
  {
    i = scrollerList.length;
    str = '<div id="scroller' + i + '_baseLayer"'
        + ' style="position:absolute;'
        + ' background-color:' + this.bdColor + ';'
        + ' width:' + this.width + 'px;'
        + ' height:' + this.height + 'px;'
        + ' overflow:hidden;'
        + ' visibility:hidden;">\n'
        + '<div id="scroller' + i + '_scrollLayer"'
        + ' style="position:absolute;'
        + ' background-color: ' + this.bgColor + ';'
        + ' width:' + this.width + 'px;'
        + ' height:' + (this.height * this.items.length) + 'px;'
        + ' visibility:inherit;">\n';
    var j;
	for (j = 0; j < this.items.length; j++)
	{	
      str += '<div id="scroller' + i + '_itemLayers' + j + '"'
          +  ' style="position:absolute;'
          +  ' width:' + this.width + 'px;'
          +  ' height:' + this.height + 'px;'
          +  ' visibility:inherit;">\n'
          +  start + this.items[j] + end
          +  '</div>\n';
    }
    str += '</div>\n'
        +  '</div>\n';

    // Insert HTML code at end of page. For IE4, need to scroll window to
    // end of page, insert and scroll back to correct bug.
    if (navigator.version < 5)
	{
      x = getPageScrollX();
      y = getPageScrollY();
      window.scrollTo(getPageWidth(), getPageHeight());
    }
    document.body.insertAdjacentHTML("beforeEnd", str);
    if (navigator.version < 5)
      window.scrollTo(x, y);

    // Get handles to each layer.
    this.baseLayer = document.getElementById("scroller" + i + "_baseLayer");
    this.scrollLayer = document.getElementById("scroller" + i + "_scrollLayer");
    this.itemLayers = new Array();
    for (j = 0; j < this.items.length; j++)
      this.itemLayers[j] = document.getElementById("scroller" + i + "_itemLayers" + j);
  }
  else if (navigator.family == 'gecko')
  {
    this.baseLayer = document.createElement('div');
	document.body.appendChild(this.baseLayer);
    
	this.scrollLayer = document.createElement('div');
	this.baseLayer.appendChild(this.scrollLayer);

    this.itemLayers = new Array();
    var i;
	for (i = 0; i < this.items.length; i++)
	{
      this.itemLayers[i] = document.createElement('div');
	  this.scrollLayer.appendChild(this.itemLayers[i]);
      var xbItemLayers = new xbStyle(this.itemLayers[i]);
	  xbItemLayers.setVisibility("inherit");
	  xbItemLayers.setInnerHTML(start + this.items[i] + end);
    }

    // Set background colors.
	var xbBaseLayer = new xbStyle(this.baseLayer);
	var xbScrollLayer = new xbStyle(this.scrollLayer);

    xbBaseLayer.setBackgroundColor(this.bdColor);
    xbScrollLayer.setBackgroundColor(this.bgColor);
	xbScrollLayer.setVisibility("inherit");
  }

  // Position and clip base and scroll layers.
  var xbBaseLayer = new xbStyle(this.baseLayer);
  var xbScrollLayer = new xbStyle(this.scrollLayer);

  var clipStr = "rect(0 " + this.width + "px " + this.height + "px 0 )";
  xbBaseLayer.moveTo(this.x, this.y);
  xbBaseLayer.setClip(clipStr);

  clipStr = "rect(0 " + (this.width - 2 * this.border) + "px " + (this.height - 2 * this.border) + "px 0 )";
  xbScrollLayer.moveTo(this.border, this.border);
  xbScrollLayer.setClip(clipStr);

  // Position and clip each item layer.
  x = 0;
  y = 0;
  for (i = 0; i < this.items.length; i++)
  {
	var xbLayer = new xbStyle(this.itemLayers[i]);
	var clipStr = "rect(0 " + this.width + "px " + this.height + "px 0 )";
    xbLayer.moveTo(x, y);
	xbLayer.setClip(clipStr);
    y += this.height;
  }

  // Set up scrolling parameters.
  this.stopped = false;
  this.currentY = 0;
  this.stepY = this.speed / (1000 / scrollerInterval);
  this.stepY = Math.min(this.height, this.stepY);
  this.nextY = this.height;
  this.maxY = this.height * (this.items.length - 1);
  this.paused = true;
  this.counter = 0;

  // Add to global list.
  scrollerList[scrollerList.length] = this;

  // Display it.
  var xbBaseLayer = new xbStyle(this.baseLayer);
  xbBaseLayer.setVisibility("visible");
}

function scrollerShow()
{
  if (this.created)
  {
	var xbBaseLayer = new xbStyle(this.baseLayer);
    xbBaseLayer.setVisibility("visible");
  }
}

function scrollerHide() {

  if (this.created)
  {
	var xbBaseLayer = new xbStyle(this.baseLayer);
    xbBaseLayer.setVisibility("hidden");
  }
}

function scrollerMoveTo(x, y) {

  if (this.created)
  {
	var xbBaseLayer = new xbStyle(this.baseLayer);
    xbBaseLayer.moveTo(x, y);
  }
}

function scrollerMoveBy(dx, dy) {

  if (this.created)
  {
	var xbBaseLayer = new xbStyle(this.baseLayer);
    xbBaseLayer.moveBy(dx, dy);
  }
}

function scrollerGetzIndex() {

  if (this.created)
  {
	var xbBaseLayer = new xbStyle(this.baseLayer);
    xbBaseLayer.getzIndex();
  }
  else
    return(0);
}

function scrollerSetzIndex(z) {

  if (this.created)
  {
	var xbBaseLayer = new xbStyle(this.baseLayer);
    xbBaseLayer.setzIndex(z);
  }
}

function scrollerStart() {

  this.stopped = false;
}

function scrollerStop() {

  this.stopped = true;
}

//*****************************************************************************
// Code for scrolling.
//*****************************************************************************

// An array is used to hold a pointer to each scroller that is defined. The
// scrollerGo() function runs at regular intervals and updates each scroller
// in this list.

var scrollerList     = new Array();
var scrollerInterval = 20;

function scrollerGo() {

  // Update each scroller object in the list.
  var i;
  for (i = 0; i < scrollerList.length; i++)
  {
    // If stopped, skip.
    if (scrollerList[i].stopped);

    // If paused, update counter.
    else if (scrollerList[i].paused) {
      scrollerList[i].counter += scrollerInterval;
      if (scrollerList[i].counter > scrollerList[i].pauseTime)
        scrollerList[i].paused = false;
    }

    // Scroll it.
    else 
	{
      scrollerList[i].currentY += scrollerList[i].stepY;

      // Pause it if the next item has scrolled into view.
      if (scrollerList[i].currentY >= scrollerList[i].nextY)
	  {
        scrollerList[i].paused = true;
        scrollerList[i].counter = 0;
        scrollerList[i].currentY = scrollerList[i].nextY;
        scrollerList[i].nextY += scrollerList[i].height;
      }

      // When we reach the end, start over.
      if (scrollerList[i].currentY >= scrollerList[i].maxY)
	  {
        scrollerList[i].currentY -= scrollerList[i].maxY;
        scrollerList[i].nextY = scrollerList[i].height;
      }
      scrollLayerTo(scrollerList[i].scrollLayer,
                    0, Math.round(scrollerList[i].currentY),
                    false);
    }
  }
}

//-----------------------------------------------------------------------------
// Layer scrolling.
//-----------------------------------------------------------------------------

function scrollLayerTo(layer, x, y, bound)
{
  var xbLayer = new xbStyle(layer);
    
  var dx = xbLayer.getClipLeft() - x;
  var dy = xbLayer.getClipTop() - y;

  scrollLayerBy(layer, -dx, -dy, bound);
}

function scrollLayerBy(layer, dx, dy, bound)
{
  var xbLayer = new xbStyle(layer);

  var cl = xbLayer.getClipLeft();
  var ct = xbLayer.getClipTop();
  var cr = xbLayer.getClipRight();
  var cb = xbLayer.getClipBottom();

  if (bound)
  {
    if (cl + dx < 0)
      dx = -cl;
    else if (cr + dx > xbLayer.getWidth())
      dx = xbLayer.getWidth() - cr;
    if (ct + dy < 0)
      dy = -ct;
    else if (cb + dy > xbLayer.getHeight())
      dy = xbLayer.getHeight() - cb;
  }

  var clipStr = "rect(" + (ct + dy) + "px " + (cr + dx) + "px " + (cb + dy) + "px " + (cl + dx) + "px )";
  xbLayer.setClip(clipStr);

  // for IE cannot use xbStyle function moveBy
  if (navigator.family == 'ie4')
  {
	layer.style.pixelLeft += (-dx);
    layer.style.pixelTop  += (-dy);
  }
  else
	xbLayer.moveBy(-dx, -dy);
}

//*****************************************************************************
// All scrollers global variable
//*****************************************************************************
// stock all scrollers in array : allScrollers["iso:id"] = scrollerObject
var allScrollers;
if (allScrollers == null)
	allScrollers = new Array();

//*************************************************************************
// image utilities
//*************************************************************************
function getImage(name)
{
	if (navigator.family == 'nn4')
		return findImage(name, document);
	else if (navigator.family == 'ie4')
		return eval('document.all.' + name);
	else if (navigator.DOMHTML)
		document.getElementById(name)
	return null;
}

function findImage(name, doc)
{
	var i, img;

	for (i = 0; i < doc.images.length; i++)
		if (doc.images[i].name == name)
			return doc.images[i];
	for (i = 0; i < doc.layers.length; i++)
		if ((img = findImage(name, doc.layers[i].document)) != null)
		{
			img.container = doc.layers[i];
			return img;
		}
	return null;
}

function getImagePageLeft(img)
{
	var x, obj;

	if (navigator.family == 'nn4')
	{
		if (img.container != null)
			return img.container.pageX + img.x;
		else
			return img.x;
	}
	else if (navigator.family == 'ie4')
	{
		x = 0;
		obj = img;
		while (obj.offsetParent != null)
		{
			x += obj.offsetLeft;
			obj = obj.offsetParent;
		}
		x += obj.offsetLeft;
		return x;
	}
	else if (navigator.DOMHTML)
	{
		var xbImg = new xbStyle(img);
		return xbImg.getPageX();
	}
	return -1;
}

function getImagePageTop(img)
{
	var y, obj;

	if (navigator.family == 'nn4') 
	{
		if (img.container != null)
			return img.container.pageY + img.y;
		else
			return img.y;
	}
	else if (navigator.family == 'ie4') 
	{
		y = 0;
		obj = img;
		while (obj.offsetParent != null) 
		{
			y += obj.offsetTop;
			obj = obj.offsetParent;
		}
		y += obj.offsetTop;
		return y;
	}
	else if (navigator.DOMHTML)
	{
		var xbImg = new xbStyle(img);
		return xbImg.getPageY();
	}
	return -1;
}

//*****************************************************************************
// Code to handle a window resize.
//*****************************************************************************
// Reload page in case of a browser resize.

// These variables are used to determine if a resize event is a true one in
// older releases of NS4.

var origWidth;
var origHeight;

if (navigator.family == 'nn4') {
  origWidth  = window.innerWidth;
  origHeight = window.innerHeight;
}

addResizeActions(scrollerReload);

function scrollerReload() {

  if (navigator.family == 'nn4' && origWidth == window.innerWidth && origHeight == window.innerHeight)
    return;

  if (navigator.family == 'ie4')
  {
/*	// For IE, reload on a timer in case the Windows 'Show window contents while
	// dragging' display option is on.
    setTimeout('window.location.href = window.location.href', 10);
*/
	  // don't reload page for IE because it's not compatible with 
	  // studio's fit to page. So replace scroller
	  var name;
	  for(name in allScrollers)
	  {
		  var scroller = allScrollers[name];
		  // Locate placeholder image so we can use it to position the scrollers.
		  var imgName = "scrollingNews" + name;
		  var img = getImage(imgName);
		  var x = getImagePageLeft(img);
		  var y = getImagePageTop(img);

		  scroller.moveTo(x,y+5);
	  }
  }
  else if (alreadyReloaded == false)
  {
    window.location.href = window.location.href;
	alreadyReloaded = true;
  }
}