/**
 * jQuery.serialScroll
 * Copyright (c) 2007-2008 Ariel Flesler - aflesler(at)gmail(dot)com | http://flesler.blogspot.com
 * Dual licensed under MIT and GPL.
 * Date: 3/20/2008
 *
 * @projectDescription Animated scrolling of series.
 * @author Ariel Flesler
 * @version 1.2.1
 *
 * @id jQuery.serialScroll
 * @id jQuery.fn.serialScroll
 * @param {Object} settings Hash of settings, it is passed in to jQuery.ScrollTo, none is required.
 * @return {jQuery} Returns the same jQuery object, for chaining.
 *
 * http://flesler.blogspot.com/2008/02/jqueryserialscroll.html
 *
 * Notes:
 *	- The plugin requires jQuery.ScrollTo.
 *	- The hash of settings, is passed to jQuery.ScrollTo, so its settings can be used as well.
 */
;(function( $ ){

	var $serialScroll = $.serialScroll = function( settings ){
		$.scrollTo.window().serialScroll( settings );
	};

	//Many of these defaults, belong to jQuery.ScrollTo, check it's demo for an example of each option.
	//@see http://flesler.webs/jQuery.ScrollTo/
	$serialScroll.defaults = {//the defaults are public and can be overriden.
		duration:1000, //how long to animate.
		axis:'x', //which of top and left should be scrolled
		event:'click', //on which event to react.
		start:0, //first element (zero-based index)
		step:1, //how many elements to scroll on each action
		lock:true,//ignore events if already animating
		cycle:true, //cycle endlessly ( constant velocity )
		constant:true //use contant speed ?
		/*
		navigation:null,//if specified, it's a selector a collection of items to navigate the container
		target:null, //if specified, it's a selector to the element to be scrolled.
		interval:0, //it's the number of milliseconds to automatically go to the next
		lazy:false,//go find the elements each time (allows AJAX or JS content, or reordering)
		stop:false, //stop any previous animations to avoid queueing
		force:false,//force the scroll to the first element on start ?
		jump: false,//if true, when the event is triggered on an element, the pane scrolls to it
		items:null, //selector to the items (relative to the matched elements)
		prev:null, //selector to the 'prev' button
		next:null, //selector to the 'next' button
		onBefore: function(){}, //function called before scrolling, if it returns false, the event is ignored
		exclude:0 //exclude the last x elements, so we cannot scroll past the end
		*/
	};

$.fn.serialScroll=function(settings){settings=$.extend({},$serialScroll.defaults,settings);var event=settings.event,step=settings.step,lazy=settings.lazy;return this.each(function(){var context=settings.target?this:document,$pane=$(settings.target||this,context),pane=$pane[0],items=settings.items,active=settings.start,auto=settings.interval,nav=settings.navigation,timer;if(!lazy)items=getItems();if(settings.force)jump({},active);$(settings.prev||[],context).bind(event,-step,move);$(settings.next||[],context).bind(event,step,move);if(!pane.ssbound)$pane.bind('prev.serialScroll',-step,move).bind('next.serialScroll',step,move).bind('goto.serialScroll',jump);if(auto)$pane.bind('start.serialScroll',function(e){if(!auto){clear();auto=true;next()}}).bind('stop.serialScroll',function(){clear();auto=false});$pane.bind('notify.serialScroll',function(e,elem){var i=index(elem);if(i>-1)active=i});pane.ssbound=true;if(settings.jump)(lazy?$pane:getItems()).bind(event,function(e){jump(e,index(e.target))});if(nav)nav=$(nav,context).bind(event,function(e){e.data=Math.round(getItems().length/nav.length)*nav.index(this);jump(e,this)});function move(e){e.data+=active;jump(e,this)};function jump(e,button){if(!isNaN(button)){e.data=button;button=pane}var pos=e.data,n,real=e.type,$items=settings.exclude?getItems().slice(0,-settings.exclude):getItems(),limit=$items.length,elem=$items[pos],duration=settings.duration;if(real)e.preventDefault();if(auto){clear();timer=setTimeout(next,settings.interval)}if(!elem){n=pos<0?0:limit-1;if(active!=n)pos=n;else if(!settings.cycle)return;else pos=limit-n-1;elem=$items[pos]}if(!elem||real&&active==pos||settings.lock&&$pane.is(':animated')||real&&settings.onBefore&&settings.onBefore.call(button,e,elem,$pane,getItems(),pos)===false)return;if(settings.stop)$pane.queue('fx',[]).stop();if(settings.constant)duration=Math.abs(duration/step*(active-pos));$pane.scrollTo(elem,duration,settings).trigger('notify.serialScroll',[pos])};function next(){$pane.trigger('next.serialScroll')};function clear(){clearTimeout(timer)};function getItems(){return $(items,pane)};function index(elem){if(!isNaN(elem))return elem;var $items=getItems(),i;while((i=$items.index(elem))==-1&&elem!=pane)elem=elem.parentNode;return i}})}})(jQuery);