/*!
 * Tiny Scrollbar 1.42
 * 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: 06 / 11 / 2010
 * 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(){
			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, iPosition.now);;
			}
			return false;
		};
		return this.initialize();
	};
})(jQuery);