/*
  # ticker.js                               Version 0.3
  # Copyright (c) 2002 Luca Borrione        write@tiscali-no.spam.it
  # Created 31 October 2002                 Last Modified 07 November 2002
  # _________________
  # COPYRIGHT NOTICE:
  # Copyright (c) 2002 Luca Borrione  All Rights Reserved.
  # Permission granted to use and modify free of charge this script so long as this
  # copyright notice above is maintained, modifications are documented,
  # and credit is given for any use of the script.
  # By using this code you agree to indemnify Luca Borrione from any liability that
  # might arise from its use.
  # Selling the code contained in this script without prior written consent is
  # expressly forbidden.
  # Obtain permission before redistributing this script over the Internet or
  # in any other medium.
  # In all cases copyright and header must remain intact.
  #
  # ____________
  # SCRIPT CODE:
*/

var d = document;
debugging = (document.domain.match (/192.168.2.199/));

function ticker (Id)
{
  var d = document;
  if (!d.ticker || !d.ticker[Id]) {init_ticker (Id);}
  if (d.ticker[Id]) {return d.ticker[Id];}
  else return null;
}
window.ticker = ticker;

function init_ticker (Id)
{
  // alert ("init "+Id);
  if (!d.ticker) d.ticker = [];
  d.ticker[Id] = new Ticker (Id);
  /*
  if (!d.ticker[Id].object)
  {
    if (debugging)
      alert ("DYNAMIC LAYER Error:\n"+
             "Impossibile risalire al layer "+ Id +".");
    delete d.layer[Id];
  }
  */
}

function Ticker (Id)
{
  this.id = Id;
  this.x = 0;
  this.y = 0;
  this.width = 100;
  this.height = 100;
  this.items = [];
  this.bgColor = null;
  
  this.visibility = true;
  
  this.inc = 2;
  this.fromX = 0;
  this.fromY = this.height;
  this.speed = 30;
  this.pause = 2000;
  
  this._dx = 0;
  this._dy = 0;
  this._timer = null;
  this._scrollCount = 0;

  this.addItem = addItem;
  this.build = build;
  this.activate = activate;
  this.start = start;
  this.slide = slide;
  this.show = ticker_show;
  this.stop = ticker_stop;
  
  this.hslide = false;
  this.sliding = true;
  
  this._css = '';
  this._div = '';
  
  this.addCSS = ticker_addCSS;
  this.addDIV = ticker_addDIV;
  
  this.started = false;
  
  
  function ticker_addCSS( D )
  {
    var doc = (D) ? D : document;
    doc.write (this._css);
  }
  
  function ticker_addDIV( D )
  {
    var doc = (D) ? D : document;
    doc.write (this._div);
  }
  
  
  function addItem (Text)
  {
    var i = this.items.length;
    this.items[i] = new Object();
    this.items[i].text = Text;
  }
  
  function build (Document)
  {
    // overflow:hidden is used for clipping in Opera
    var visibility = (this.visibility) ? 'inherit' : 'hidden';
    var bgcolor = (this.bgColor) ? 'background-color:'+this.bgColor+'; layer-background-color:'+this.bgColor+';' : '';
    this._css = ''+
    '<style type="text/css">'+
      '#'+this.id+' {'+
        'position:absolute;'+
        'visibility:'+ visibility +';'+
        'left:'+ this.x +'; top:'+ this.y +';'+
        'width:'+ this.width +'; height:'+ this.height +'; clip:rect(0,'+ this.width +','+ this.height +',0);'+
        bgcolor +
      '}'+
      '.'+this.id+'Item {'+
        'position:absolute;'+
        'visibility:hidden;'+
        'left:0; top:0;'+
        'width:'+ this.width +'; height:'+ this.height +'; clip:rect(0,'+ this.width +','+ this.height +',0);'+
        // 'background-color:aqua;layer-background-color:aqua;'+
        'text-align:left;'+
        ''+
      '}'+
    '</style>';
    this._div = '<div id="'+this.id+'">';
    for (var i=0; i<this.items.length; i++)
    {
      newsItemA = i;
      this._div += '<div class="'+this.id+'Item" id="'+this.id+'Item'+i+'">'+this.items[i].text+'</div>'
    }
    this._div += '</div>';
  }
  
  function activate ()
  {
    this.fromX = (this.hslide) ? this.width : 0;
    this.fromY = (this.hslide) ? 0 : this.height;
    for (var i=0; i<this.items.length; i++)
    {
      with (layer (this.id+'Item'+i))
      {
        if (i==0 || !this.sliding)
        // if (i==0)
          moveTo(0,0, this.id);
        else
          moveTo(this.fromX,this.fromY, this.id);
        if (this.sliding || i==0)
          show();
        unset();
      }
    }
    var num = Math.sqrt(Math.pow(this.fromX,2) + Math.pow(this.fromY,2))/this.inc;
    ticker(this.id)._dx = this.fromX/num || 0;
    ticker(this.id)._dy = this.fromY/num || 0;
    ticker(this.id).items = this.items;
	if (this.sliding)
      setTimeout('ticker("'+this.id+'").start()', this.pause);
	else
	  setTimeout('ticker("'+this.id+'").start()', 100);
  }
  
  function start()
  {
    if (!this.sliding)
    {
	  // alert(this.started);
	  if (this.started)
	  {
        var a = this._scrollCount;
        var b = (this._scrollCount==this.items.length-1)? 0 : this._scrollCount+1;
        /*
        layer(this.id+'Item'+a).moveTo (this.fromX,this.fromY, this.id);
        layer(this.id+'Item'+b).moveTo (0,0, this.id);
        */

        layer(this.id+'Item'+a).hide();
        layer(this.id+'Item'+b).show();

        this._scrollCount = (this._scrollCount==this.items.length-1)? 0 : this._scrollCount+1;
        // setTimeout('ticker("'+this.id+'").start()', this.pause);
	  }
	  ticker(this.id).started = true;
      clearInterval(this.timer);
      this.timer = null;
      ticker(this.id).timer = setInterval('ticker("'+this.id+'").start()', this.pause);
    }
    else if (!this.started)
    {
      this.started = true;
      var a = this._scrollCount;
      var b = (this._scrollCount==this.items.length-1)? 0 : this._scrollCount+1;
      // alert("a: "+a+"||b: "+b+"||items: "+this.items);
      ticker(this.id).items = this.items;
      ticker(this.id).timer = setInterval('ticker("'+this.id+'").slide("'+this.id+'Item'+a+'","'+this.id+'Item'+b+'")', this.speed);
    }
  }
  
  function slide (a,b)
  {
    layer(a).moveBy (-this._dx, -this._dy);
    layer(b).moveBy (-this._dx, -this._dy);
    // if (layer(b).top <=0)
    if ((this.hslide && layer(b).left<=0) || (!this.hslide && layer(b).top <=0))
    {
      // alert ("fine");
            
      if (is.nn4)
      {
        layer(a).reset();
        layer(b).reset();
      }
      clearInterval(this.timer);
      this.timer = null;
      layer(a).moveTo (this.fromX,this.fromY, this.id);
      layer(b).moveTo (0,0, this.id);
      this._scrollCount = (this._scrollCount==this.items.length-1)? 0 : this._scrollCount+1;
      ticker(this.id).timer = setTimeout('with(ticker("'+this.id+'")){started=false;start();}',this.pause);
    }
  }
  
  function ticker_show ()
  {
    layer(this.id).show();
  }
  
  function ticker_stop ()
  {
    clearInterval(this.timer);
    this.timer = null;
    this.started = false;
  }
  
}