Tiny Carousel + Looping Controls

/*!
 * Tiny Carousel 1.9
 * http://www.baijs.nl/tinycarousel
 *
 * Copyright 2010, Maarten Baijs
 * Dual licensed under the MIT or GPL Version 2 licenses.
 * http://www.opensource.org/licenses/mit-license.php
 * http://www.opensource.org/licenses/gpl-2.0.php
 *
 * Date: 01 / 06 / 2011
 * Depends on library: jQuery
 */

 /*!
 *looping by Xynyn Vee
 */

(function($){
    $.tiny = $.tiny || { };

    $.tiny.carousel = {
        options: {
            start: 1, // where should the carousel start?
            display: 1, // how many blocks do you want to move at 1 time?
            axis: 'x', // vertical or horizontal scroller? ( x || y ).
            controls: true, // show left and right navigation buttons.
            pager: false, // is there a page number navigation present?
            interval: false, // move to another block on intervals.
            intervaltime: 3000, // interval time in milliseconds.
            rewind: false, // If interval is true and rewind is true it will play in reverse if the last slide is reached.
            animation: true, // false is instant, true is animate.
            duration: 1000, // how fast must the animation move in ms?
            loop: true, //should pressing next on the last slide move to the first slide? Should pressing previous on the first slide move to the last?
            callback: null // function that executes after every move.
        }
    };

    $.fn.tinycarousel = function(options) {
        var options = $.extend({}, $.tiny.carousel.options, options);
        this.each(function(){ $(this).data('tcl', new Carousel($(this), options)); });
        return this;
    };
    $.fn.tinycarousel_start = function(){ $(this).data('tcl').start(); };
    $.fn.tinycarousel_stop = function(){ $(this).data('tcl').stop(); };
    $.fn.tinycarousel_move = function(iNum){ $(this).data('tcl').move(iNum-1,true); };

    function Carousel(root, options){
        var oSelf = this;
        var oViewport = $('.viewport:first', root);
        var oContent = $('.overview:first', root);
        var oPages = oContent.children();
        var oBtnNext = $('.next:first', root);
        var oBtnPrev = $('.prev:first', root);
        var oPager = $('.pager:first', root);
        var iPageSize, iSteps, iCurrent, oTimer, bPause, bForward = true, bAxis = options.axis == 'x';

        function initialize(){
            iPageSize = bAxis ? $(oPages[0]).outerWidth(true) : $(oPages[0]).outerHeight(true);
            var iLeftover = Math.ceil(((bAxis ? oViewport.outerWidth() : oViewport.outerHeight()) / (iPageSize * options.display)) -1);
            iSteps = Math.max(1, Math.ceil(oPages.length / options.display) - iLeftover);
            iCurrent = Math.min(iSteps, Math.max(1, options.start)) -2;
            oContent.css(bAxis ? 'width' : 'height', (iPageSize * oPages.length));
            oSelf.move(1);
            setEvents();
            return oSelf;
        };
        function setEvents(){
            if(options.controls && oBtnPrev.length > 0 && oBtnNext.length > 0){
                if (options.loop) {
                    oBtnPrev.click(function(){previous()});
                    oBtnNext.click(function(){next()});
                }
                else {
                    oBtnPrev.click(function(){oSelf.move(-1); return false;});
                    oBtnNext.click(function(){oSelf.move( 1); return false;});
                }
            }
            if(options.interval){ root.hover(oSelf.stop,oSelf.start); }
            if(options.pager && oPager.length > 0){ $('a',oPager).click(setPager); }
        };
        function setButtons(){
            if(options.controls && !options.loop){
                oBtnPrev.toggleClass('disable', !(iCurrent > 0));
                oBtnNext.toggleClass('disable', !(iCurrent +1 < iSteps));
            }
            if(options.pager){
                var oNumbers = $('.pagenum', oPager);
                oNumbers.removeClass('active');
                $(oNumbers[iCurrent]).addClass('active');
            }
        };
        function setPager(oEvent){
            if($(this).hasClass('pagenum')){ oSelf.move(parseInt(this.rel), true); }
            return false;
        };
        function next () {
            iCurrent = iCurrent +1 == iSteps ? -1 : iCurrent;
            bForward = iCurrent +1 == iSteps ? false : iCurrent == 0 ? true : bForward;
            oSelf.move(bForward ? 1 : -1);
        }
        function previous() {
            iCurrent = iCurrent -1 == -1 ? iSteps : iCurrent;
            bForward = iCurrent -1 == iSteps ? true : iCurrent == 0 ? false : bForward;
            oSelf.move(bForward ? -1 : 1);
        }
        function setTimer(){
            if(options.interval && !bPause){
                clearTimeout(oTimer);
                oTimer = setTimeout(function(){
                    iCurrent = iCurrent +1 == iSteps ? -1 : iCurrent;
                    bForward = iCurrent +1 == iSteps ? false : iCurrent == 0 ? true : bForward;
                    oSelf.move(bForward ? 1 : -1);
                }, options.intervaltime);
            }
        };
        this.stop = function(){ clearTimeout(oTimer); bPause = true; };
        this.start = function(){ bPause = false; setTimer(); };
        this.move = function(iDirection, bPublic){
            iCurrent = bPublic ? iDirection : iCurrent += iDirection;
            if(iCurrent > -1 && iCurrent < iSteps){
                var oPosition = {};
                oPosition[bAxis ? 'left' : 'top'] = -(iCurrent * (iPageSize * options.display));
                oContent.animate(oPosition,{
                    queue: false,
                    duration: options.animation ? options.duration : 0,
                    complete: function(){
                        if(typeof options.callback == 'function')
                        options.callback.call(this, oPages[iCurrent], iCurrent);
                    }
                });
                setButtons();
                setTimer();
            }
        };
        return initialize();
    };
})(jQuery);