/**
 * Accessible JavaScript Newsticker
 *
 * Copyright 2009 Minor modifications by Serg N. Kalachev
 * Copyright 2006 Wolfgang Bartelme
 * Bartelme Design - http://bartelme.at
 */
 
// Create namespace ------------------------------------------------------------
if (at == undefined) var at = {};
if (at.bartelme == undefined) at.bartelme = {};

// Newsticker class ------------------------------------------------------------
at.bartelme.newsticker = Class.create();
at.bartelme.newsticker.prototype = {
  initialize: function()
  {
    this.interval           = 5000;
    this.container          = $("newsticker");
    this.messages           = $A(this.container.getElementsByTagName("li"));
    this.number_of_messages = this.messages.length;
//  commented out by serg@kalachev.ru
//  ----------------------------------
//    if (this.number_of_messages == 0)
//    {
//      this.showError();
//      return false;
//    }
    this.current_message = 0;
    this.previous_message = null;

    // Create toggle button ------------------------------------------------
//  commented out by serg@kalachev.ru
//  ----------------------------------
//    this.toggle_button           = document.createElement("a");
//    this.toggle_button.href      = "#";
//    this.toggle_button.id        = "togglenewsticker";
//    this.toggle_button.innerHTML = "Toggle";
//    Event.observe(this.toggle_button, "click", this.toggle.bindAsEventListener(this), false);
//    this.container.appendChild(this.toggle_button);

        // Display first message -----------------------------------------------
    this.hideMessages();
    this.showMessage();
    // Install timer
    this.timer = setInterval(this.showMessage.bind(this), this.interval);
    },
  showMessage: function()
  {
    Effect.Appear(this.messages[this.current_message]);
    setTimeout(this.fadeMessage.bind(this), this.interval-2000);
    if (this.current_message < this.number_of_messages-1)
    {
      this.previous_message = this.current_message;
      this.current_message  = this.current_message + 1;
    } else {
      this.current_message  = 0;
      this.previous_message = this.number_of_messages - 1;
    }
  },
  fadeMessage: function() { Effect.Fade(this.messages[this.previous_message]); },
  hideMessages: function() { this.messages.each(function(message) { Element.hide(message); }) }
//  commented out by serg@kalachev.ru
//  ----------------------------------
//  toggle: function() { Effect.BlindUp(this.container, 1000); },
//  showError: function()
//  {
//    if (this.container.getElementsByTagName("ul").length == 0)
//    {
//      this.list = document.createElement("ul");
//      this.container.appendChild(this.list);
//    } else {
//      this.list = this.container.getElementsByTagName("ul")[0];
//    }
//    this.errorMessage = document.createElement("li");
//    this.errorMessage.className = "error";
//    this.errorMessage.innerHTML = "Could not retrieve data";
//    this.list.appendChild(this.errorMessage);
//  }
}

Event.observe(window, "load", function()
{
  $('newsticker').show();
  new at.bartelme.newsticker();
}, false);