/*
 *
 * Copyright (c) 2006/2007 Sam Collett (http://www.texotela.co.uk)
 * Licensed under the MIT License:
 * http://www.opensource.org/licenses/mit-license.php
 *
 * Version 2.0
 * Demo: http://www.texotela.co.uk/code/jquery/newsticker/
 *
 * $LastChangedDate$
 * $Rev$
 *
 */

(function($) {
/*
 * A basic news ticker.
 *
 * @name     newsticker (or newsTicker)
 * @param    delay      Delay (in milliseconds) between iterations. Default 4 seconds (4000ms)
 * @author   Sam Collett (http://www.texotela.co.uk)
 * @example  $("#news").newsticker(); // or $("#news").newsTicker(5000);
 *
 */
$.fn.newsTicker = $.fn.newsticker = function(delay)
{
        delay = delay || 4000;
        initTicker = function(el)
        {
                stopTicker(el);
                el.items = $("li", el);
                // hide all items (except first one)
                el.items.not(":eq(0)").hide().end();
                // current item
                el.currentitem = 0;
                startTicker(el);
        };
        startTicker = function(el)
        {
                el.tickfn = setInterval(function() { doTick(el) }, delay)
        };
        stopTicker = function(el)
        {
                clearInterval(el.tickfn);
        };
        pauseTicker = function(el)
        {
                el.pause = true;
        };
        resumeTicker = function(el)
        {
                el.pause = false;
        };
        doTick = function(el)
        {
                // don't run if paused
                if(el.pause) return;
                // pause until animation has finished
                el.pause = true;
                // hide current item
                $(el.items[el.currentitem]).fadeOut("slow",
                        function()
                        {
                                $(this).hide();
                                // move to next item and show
                                el.currentitem = ++el.currentitem % (el.items.size());
                                $(el.items[el.currentitem]).fadeIn("slow",
                                        function()
                                        {
                                                el.pause = false;
                                        }
                                );
                        }
                );
        };
        this.each(
                function()
                {
                        if(this.nodeName.toLowerCase()!= "ul") return;
                        initTicker(this);
                }
        )
        .addClass("newsticker")
        .hover(
                function()
                {
                        // pause if hovered over
                        pauseTicker(this);
                },
                function()
                {
                        // resume when not hovered over
                        resumeTicker(this);
                }
        );
        return this;
};

})(jQuery);