/*!
 * Tiny Scrollbar 1.43
 * http://www.baijs.nl/tinyscrollbar/
 *
 * 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: 02 / 24 / 2011
 * Depends on library: jQuery
 */
(function($) {
    $.fn.tinyscrollbar = function(options) {
        var defaults = {
            axis: 'y', // vertical or horizontal scrollbar? ( x || y ).
            wheel: 40,  //how many pixels must the mouswheel scroll at a time.
            scroll: true, //enable or disable the mousewheel scrollbar
            size: 'auto', //set the size of the scrollbar to auto or a fixed number.
            sizethumb: 'auto' //set the size of the thumb to auto or a fixed number.
        };
        var options = $.extend(defaults, options);
        var oWrapper = $(this);
        var oViewport = { obj: $('.viewport', this) };
        var oContent = { obj: $('.overview', this) };
        var oScrollbar = { obj: $('.scrollbar', this) };
        var oTrack = { obj: $('.track', oScrollbar.obj) };
        var oThumb = { obj: $('.thumb', oScrollbar.obj) };
        var sAxis = options.axis == 'x', sDirection = sAxis ? 'left' : 'top', sSize = sAxis ? 'Width' : 'Height';
        var iScroll, iPosition = { start: 0, now: 0 }, iMouse = { };

        if (this.length > 1) {
            this.each(function() { $(this).tinyscrollbar(options) });
            return this;
        }
        this.initialize = function() {
            this.update();
            setEvents();
        };
        this.update = function() {
            iScroll = 0;
            oViewport[options.axis] = oViewport.obj[0]['offset' + sSize];
            oContent[options.axis] = oContent.obj[0]['scroll' + sSize];
            oContent.ratio = oViewport[options.axis] / oContent[options.axis];
            oScrollbar.obj.toggleClass('disable', oContent.ratio >= 1);
            oTrack[options.axis] = options.size == 'auto' ? oViewport[options.axis] : options.size;
            oThumb[options.axis] = Math.min(oTrack[options.axis], Math.max(0, (options.sizethumb == 'auto' ? (oTrack[options.axis] * oContent.ratio) : options.sizethumb)));
            oScrollbar.ratio = options.sizethumb == 'auto' ? (oContent[options.axis] / oTrack[options.axis]) : (oContent[options.axis] - oViewport[options.axis]) / (oTrack[options.axis] - oThumb[options.axis]);
            setSize();
        };

        function setSize() {
            if (!sAxis) oContent.obj.removeAttr('style');
            oThumb.obj.removeAttr('style');
            iMouse['start'] = oThumb.obj.offset()[sDirection];
            var sCssSize = sSize.toLowerCase();
            oScrollbar.obj.css(sCssSize, oTrack[options.axis]);
            oTrack.obj.css(sCssSize, oTrack[options.axis]);
            oThumb.obj.css(sCssSize, oThumb[options.axis]);
        }

        ;

        function setEvents() {
            oThumb.obj.bind('mousedown', start);
            oTrack.obj.bind('mouseup', drag);
            if (options.scroll && this.addEventListener) {
                oWrapper[0].addEventListener('DOMMouseScroll', wheel, false);
                oWrapper[0].addEventListener('mousewheel', wheel, false);
            } else if (options.scroll) {
                oWrapper[0].onmousewheel = wheel;
            }
        }

        ;

        function start(oEvent) {
            iMouse.start = sAxis ? oEvent.pageX : oEvent.pageY;
            var oThumbDir = parseInt(oThumb.obj.css(sDirection));
            iPosition.start = oThumbDir == 'auto' ? 0 : oThumbDir;
            $(document).bind('mousemove', drag);
            $(document).bind('mouseup', end);
            oThumb.obj.bind('mouseup', end);
            return false;
        }

        ;

        function wheel(oEvent) {
            if (!(oContent.ratio >= 1)) {
                oEvent = $.event.fix(oEvent || window.event);
                var iDelta = oEvent.wheelDelta ? oEvent.wheelDelta / 120 : -oEvent.detail / 3;
                iScroll -= iDelta * options.wheel;
                iScroll = Math.min((oContent[options.axis] - oViewport[options.axis]), Math.max(0, iScroll));
                oThumb.obj.css(sDirection, iScroll / oScrollbar.ratio);
                oContent.obj.css(sDirection, -iScroll);
                oEvent.preventDefault();
            }
            ;
        }

        ;

        function end(oEvent) {
            $(document).unbind('mousemove', drag);
            $(document).unbind('mouseup', end);
            oThumb.obj.unbind('mouseup', end);
            return false;
        }

        ;

        function drag(oEvent) {
            if (!(oContent.ratio >= 1)) {
                iPosition.now = Math.min((oTrack[options.axis] - oThumb[options.axis]), Math.max(0, (iPosition.start + ((sAxis ? oEvent.pageX : oEvent.pageY) - iMouse.start))));
                iScroll = iPosition.now * oScrollbar.ratio;
                oContent.obj.css(sDirection, -iScroll);
                oThumb.obj.css(sDirection, iPosition.now);
                ;
            }
            return false;
        }

        ;
        return this.initialize();
    };
})(jQuery);