/*Sag Content Scroller (Aug 7th, 2010)
* This notice must stay intact for usage 
* Author: Dynamic Drive at http://www.dynamicdrive.com/
* Visit http://www.dynamicdrive.com/ for full source code
*/

//Updated Aug 28th, 10 to v1.3

function sagscroller(options){
	this.setting={mode:'manual', inittype:'stunted', pause:4000, animatespeed:500} //default settings
	jQuery.extend(this.setting, options) //merge default settings with options
	options=null
	this.curmsg=0
	var slider=this
	slider.$slider=$('#'+slider.setting.id);
	slider.init($);
}

sagscroller.prototype={

	resetuls:function(){ //function to swap between primary and secondary ul
		var $tempul=this.$mainul
		this.$mainul=this.$secul.css({zIndex:1000})
		this.$secul=$tempul.css({zIndex:999})
		this.$secul.css('top', this.ulheight)
	},
	
	setgetoffset:function($li){
		var recaldimensions=(this.setting.ajaxsource || this.setting.rssdata) && this.setting.inittype=="onload" //bool to see if script should always refetch dimensions
		if (this.curmsg==this.$lis.length) {
			return (!this.ulheight || recaldimensions)? this.ulheight=this.$mainul.height() : this.ulheight
		} else {
			if (!$li.data('toppos') || recaldimensions)
				$li.data('toppos', $li.position().top)
			return $li.data('toppos')
		}
	},

	scrollmsg:function(repeat){
		var slider=this, setting=this.setting
		var ulheight=this.ulheight || this.$mainul.height()
		var endpoint=-this.setgetoffset(this.$lis.eq(this.curmsg))
		this.$mainul.animate({top: endpoint}, setting.animatespeed, function(){
			slider.curmsg=(slider.curmsg<slider.$lis.length+1)? slider.curmsg+1 : 0
			if (slider.curmsg==slider.$lis.length+1){ //if at end of UL
				slider.resetuls() //swap between main and sec UL
				slider.curmsg=1
			}
			if (repeat)
				slider.scrolltimer=setTimeout(function(){slider.scrollmsg(repeat)}, setting.pause)
		})
		var secendpoint=endpoint+ulheight
		this.$secul.animate({top: secendpoint}, setting.animatespeed)
	},

	stopscroll:function(){
		if (this.$mainul){
			this.$mainul.add(this.$secul).stop(true, false)
			clearTimeout(this.scrolltimer)
		}
	},

	init:function($){
		var setting=this.setting
		this.$mainul=this.$slider.find('ul:eq(0)').css({zIndex:1000})
		this.$lis=this.$mainul.find('li')
		this.$secul=this.$mainul.clone().css({top:this.$mainul.height(), zIndex:999}).appendTo(this.$slider) //create sec UL and add it to the end of main UL
		this.scrollmsg(setting.mode=="auto")
	}
}