/**
 * @author Bruno Bornsztein <bruno@missingmethod.com>
 * @copyright 2007 Curbly LLC
 * @package Glider
 * @license MIT
 * @url http://www.missingmethod.com/projects/glider/
 * @version 0.0.3
 * @dependencies prototype.js 1.5.1+, effects.js
 */

/*  Thanks to Andrew Dupont for refactoring help and code cleanup - http://andrewdupont.net/  */

Glider=Class.create();

Object.extend(
	Object.extend(Glider.prototype,Abstract.prototype),
	{initialize:function(wrapper,options){this.scrolling=false;this.wrapper=$(wrapper);this.scroller=this.wrapper.down('div.scroller');this.sections=this.wrapper.getElementsBySelector('div.section');this.options=Object.extend({controlsEvent:'click',duration:1.0,frequency:3},options||{});this.sections.each(function(section,index){section._index=index;});this.events={click:this.click.bind(this)};this.addObservers();if(this.options.initialSection)this.moveTo(this.options.initialSection,this.scroller,{duration:this.options.duration});if(this.options.autoGlide)this.start();},addObservers:function(){this.controls=this.wrapper.getElementsBySelector('.controls a');this.controls.invoke('observe',this.options.controlsEvent,this.events.click);},click:function(event){this.stop();var element=Event.findElement(event,'a');if(this.scrolling)
this.scrolling.cancel();moveToHere=element.href.split("#")[1];this.moveTo(moveToHere,this.scroller,{duration:this.options.duration});Event.stop(event);this.controls.each(function(control){if(control==element){control.addClassName("active")}else{control.removeClassName("active")}});},moveTo:function(element,container,options){this.current=$(element);Position.prepare();var containerOffset=Position.cumulativeOffset(container),elementOffset=Position.cumulativeOffset($(element));this.scrolling=new Effect.SmoothScroll(container,{duration:options.duration,x:(elementOffset[0]-containerOffset[0]),y:(elementOffset[1]-containerOffset[1])});return false;},


next:function(){if(this.current){var currentIndex=this.current._index;var nextIndex=(this.sections.length-1==currentIndex)?0:currentIndex+1;}else var nextIndex=1;this.moveTo(this.sections[nextIndex],this.scroller,{duration:this.options.duration});},previous:function(){if(this.current){var currentIndex=this.current._index;var prevIndex=(currentIndex==0)?this.sections.length-1:currentIndex-1;}else var prevIndex=this.sections.length-1;this.moveTo(this.sections[prevIndex],this.scroller,{duration:this.options.duration});},stop:function()
{clearTimeout(this.timer);},start:function()
{this.periodicallyUpdate();},periodicallyUpdate:function()
{if(this.timer!=null){clearTimeout(this.timer);this.next();}
this.timer=setTimeout(this.periodicallyUpdate.bind(this),this.options.frequency*1000);}});Effect.SmoothScroll=Class.create();Object.extend(Object.extend(Effect.SmoothScroll.prototype,Effect.Base.prototype),{initialize:function(element){this.element=$(element);var options=Object.extend({x:0,y:0,mode:'absolute'},arguments[1]||{});this.start(options);},setup:function(){if(this.options.continuous&&!this.element._ext){this.element.cleanWhitespace();this.element._ext=true;this.element.appendChild(this.element.firstChild);}
this.originalLeft=this.element.scrollLeft;this.originalTop=this.element.scrollTop;if(this.options.mode=='absolute'){this.options.x-=this.originalLeft;this.options.y-=this.originalTop;}},update:function(position){this.element.scrollLeft=this.options.x*position+this.originalLeft;this.element.scrollTop=this.options.y*position+this.originalTop;}});