/*****************************************************************************
* jQuery Headline Scroll
* Version: 2.0 released 2009-02-11
* Author: Dave Ross <dave@csixty4.com>
* License: BSD
* Requires: jQuery 1.2.1 or higher (may work with others, not tested)
*
* To make an element scroll automatically, assign it a height through CSS
* and give it the class "autoscroll".
*
* To control scroll speed, give new values to these global variables:
*   scrollerIntervalMs = {how often to scroll, in milliseconds, default 200}
*   scrollerStep       = {# of pixels to scroll each interval, default 1}
*
* Copyright (c) 2009, Dave Ross <dave@csixty4.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*     * Redistributions of source code must retain the above copyright
*       notice, this list of conditions and the following disclaimer.
*     * Redistributions in binary form must reproduce the above copyright
*       notice, this list of conditions and the following disclaimer in the
*       documentation and/or other materials provided with the distribution.
*     * Neither the name of the <organization> nor the
*       names of its contributors may be used to endorse or promote products
*       derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY Dave Ross ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL <copyright holder> BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
****************************************************************************/

var scrollerIntervalMs = 200;

function jQueryAutoScroll() { }

jQueryAutoScroll.initScroller = function() {
    $('.autoscroll').each(function() {

        // Add event handlers to toggle pausing
        $(this).mouseover(function() { jQueryAutoScroll.doPause(this); });
        $(this).mouseout(function() { jQueryAutoScroll.doPause(this); });

        // Default each elements' scrollerStep to 1 if not set
        if ($(this).attr('scrollerStep') == undefined)
            if (undefined === window.scrollerStep)
            $(this).attr('scrollerStep', 1);
        else
            $(this).attr('scrollerStep', scrollerStep);

    });

    // Set interval to scroll another step every scrollerIntervalMs
    setInterval("jQueryAutoScroll.doScroll()", scrollerIntervalMs);
}

jQueryAutoScroll.doScroll = function() {
    $('.autoscroll').filter(':not(".paused")').each(function() {

        var scrollerStep = parseInt($(this).attr('scrollerStep'), 10);

        if ($(this).hasClass('horizontalscroll')) {
            var x = this.scrollLeft;

            // The height of the div, as defined by CSS
            var divWidth = parseInt($(this).css('width'));

            // The height of the div's contents
            var contentWidth = this.scrollWidth;

            // Increment the position we're scrolling to by 1px
            x += scrollerStep;

            // Start over if we've scrolled too far
            if ((x <= 0) || (x >= (contentWidth - divWidth))) {
                if ($(this).hasClass('reversingscroll')) {
                    scrollerStep *= -1;
                    x = x + scrollerStep;
                }
                else {
                    x = 0;
                }
            }

            // Scroll!
            this.scrollLeft = x;
        }
        else {
            var x = this.scrollTop;

            // The height of the div, as defined by CSS
            var divHeight = parseInt($(this).css('height'));

            // The height of the div's contents
            var contentHeight = this.scrollHeight;

            // Increment the position we're scrolling to by 1px
            x += scrollerStep;

            // Start over if we've scrolled too far
            if ((x <= 0) || (x >= (contentHeight - divHeight))) {
                if ($(this).hasClass('reversingscroll')) {
                    scrollerStep *= -1;
                    x = x + scrollerStep;
                }
                else {
                    x = 0;
                }
            }

            // Scroll!
            this.scrollTop = x;
        }

        $(this).attr('scrollerStep', scrollerStep);

    });
}

jQueryAutoScroll.doPause = function(el) {
    $(el).toggleClass('paused');
}

$(document).ready(function() {
    jQueryAutoScroll.initScroller();
});