databap/jquery/tinyscrollbar.js

(
	function($)
	{
		$.tiny = $.tiny||{};
		$.tiny.scrollbar = {options:{axis:'y',wheel:40,scroll:true,size:'auto',sizethumb:'auto'}};
		$.fn.tinyscrollbar=function(options){var options=$.extend({},$.tiny.scrollbar.options,options);this.each(function(){$(this).data('tsb',new Scrollbar($(this),options));});return this;};
		$.fn.tinyscrollbar_update=function(sScroll){return $(this).data('tsb').update(sScroll);};
		
		function Scrollbar(root,options)
		{
			var oSelf=this;
			var oWrapper=root;
			var oViewport={obj:$(options.viewport,root)};
			var oContent={obj:$(options.overview,root)};
			var oScrollbar={obj:$('.scrollbar',root)};
			var oTrack={obj:$('.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={};
			
			function initialize()
			{
				oSelf.update();
				setEvents();
				return oSelf;
			}
			
			this.update=function(sScroll)
			{
				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]);
				iScroll=(sScroll=='relative'&&oContent.ratio<=1)?Math.min((oContent[options.axis]-oViewport[options.axis]),Math.max(0,iScroll)):0;
				iScroll=(sScroll=='bottom'&&oContent.ratio<=1)?(oContent[options.axis]-oViewport[options.axis]):isNaN(parseInt(sScroll))?iScroll:parseInt(sScroll);
				setSize();
			};
			
			function setSize()
			{
				oThumb.obj.css(sDirection,iScroll/oScrollbar.ratio);
				oContent.obj.css(sDirection,-iScroll);
				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);
				//[+]oViewport.obj.bind('mousedown',start);
				oThumb.obj[0].ontouchstart=function(oEvent)
				{
					oEvent.preventDefault();
					oThumb.obj.unbind('mousedown');
					start(oEvent.touches[0]);
					return false;
				};
				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.ontouchmove=function(oEvent)
				{
					$(document).unbind('mousemove');
					drag(oEvent.touches[0]);
				};
				
				$(document).bind('mouseup',end);
				oThumb.obj.bind('mouseup',end);
				oThumb.obj[0].ontouchend=document.ontouchend=function(oEvent)
				{
					$(document).unbind('mouseup');
					oThumb.obj.unbind('mouseup');
					end(oEvent.touches[0]);
				};
				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);
				document.ontouchmove=oThumb.obj[0].ontouchend=document.ontouchend=null;
				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 initialize();
		};
	}
)
(jQuery);