/*
 * Tiny Scrollbar 1.42
 *
 * Copyright (c) 2010 Maarten Baijs
 *
 * Date: 06 / 11 / 2010
 * Library: jQuery
 *
 */

// from http://baijs.nl/tinyscrollbar/

 (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() {
            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;
            iPosition.start = parseInt(oThumb.obj.css(sDirection));
            $(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, Math.max(iPosition.now-1, 0)); // was: oThumb.obj.css(sDirection, iPosition.now); mnk 2010-11-07
            }
            return false;
        };
        return this.initialize();
    };
})(jQuery);