// -------------------------------------------------------------------
// gAjax RSS Pausing Scroller- By Dynamic Drive, available at: http://www.dynamicdrive.com
// Created: Aug 2nd, 2007 Updated: n/a
// REQUIRES: gfeedfetcher.js class, available at http://dynamicdrive.com/dynamicindex18/gajaxrssdisplayer.htm
// -------------------------------------------------------------------

//Specify full URL to "loading" image. Overwrites same var from gfeedfetcher.js
var gfeedfetcher_loading_image="modules/mod_camp26_special_ajaxrss/ajaxrss_inc/indicator.gif";

function gfeedpausescroller(divid, divClass, delay, linktarget)
{
	//ID of outermost scroller div
	this.tickerid = divid;

	//Default delay between msg change, in miliseconds.
	this.delay = parseInt( delay ); 

	//Boolean to indicate whether mouse is currently over scroller (and pause it if it is)
	this.mouseoverBol = 0; 

	//index of RSS feed array's entry for hidden div
	this.hiddendivpointer = 1; 

	//Entries to show per page
	this.itemsperpage = 1; 
	
	document.write(	'<div id="' + divid + 
				   	'" class="' + divClass + 
					'" style="position: relative; overflow: hidden">' +
					'<div class="innerDiv" style="position: absolute; width: 100%" id="' + divid + '1">' +
					'<span style="position: absolute">Initializing RSS scroller...</span></div>' +
					'<div class="innerDiv" style="position: absolute; width: 100%; visibility: hidden" id="' +
					divid + '2"></div>');
	//inherit properties from "gfeedfetcher" class, but feed it bogus ID/Class, as we won't be using the DIV generated by "gfeedfetcher"
	gfeedfetcher.call(this, divid + "unneeded", divClass + "unneeded", linktarget); 
	
	document.write('</div>');

	//default element wrapping around each RSS entry
	this.itemcontainer = "<div>"; 

	//Hide unneeded div generated after inheriting properties from "gfeedfetcher" class
	this.feedcontainer.style.display = "none"; 

	//overwrite inherited "feedcontainer" to reference the first DIV within scroller container
	this.feedcontainer = document.getElementById(divid + '1'); 
	
	this.tickerdiv = document.getElementById( divid );
	
	this.visiblediv = document.getElementById( divid + "1");
	
	this.hiddendiv = document.getElementById( divid + "2");

	//Determine the "top" boundary of the visible div, factoring in any CSS padding
	this.visibledivtop = parseInt(this.tickerdiv.currentStyle? this.tickerdiv.currentStyle["paddingTop"] : window.getComputedStyle ? window.getComputedStyle(this.tickerdiv, "").getPropertyValue("padding-top") : 0); 

	//IE has trouble getting offsetWidth while page is loading, so use global CSS value instead
	this.tickerdivwidth = this.tickerdiv.currentStyle? parseInt(this.tickerdiv.currentStyle["width"]) : this.tickerdiv.offsetWidth; 

	//IE has trouble getting offsetWidth while page is loading, so use global CSS value instead. "50" accounts for any possible padding skewing things. Variable used by any other browser.
	this.tickerdivheight = this.tickerdiv.currentStyle ? parseInt(this.tickerdiv.currentStyle["height"]) : 0; 
}

//inherit methods from gfeedfetcher class
gfeedpausescroller.prototype = new gfeedfetcher; 

gfeedpausescroller.prototype.constructor = gfeedpausescroller;

//Remove inherited method "_displayresult()"
gfeedpausescroller.prototype._displayresult = null; 


// -------------------------------------------------------------------
// entries_per_page()- Sets the number of RSS entries to display per page (at once)
// -------------------------------------------------------------------

gfeedpausescroller.prototype.entries_per_page = function( num )
{
	this.itemsperpage = num;
}

// -------------------------------------------------------------------
// _signaldownloadcomplete()- Signals to the rest of the script when the fetching of all RSS feeds is complete
// -------------------------------------------------------------------

gfeedpausescroller.prototype._signaldownloadcomplete = function()
{ 	//overwrite inherited method "_signaldownloadcomplete()"
	this.feedsfetched += 1;

	//if all feeds fetched
	if ( this.feedsfetched == this.feedstructure.length ) 
		//Populate the two DIVs within scroller with the fetched data
		this._populateticker( this.feeds ); 
}

// -------------------------------------------------------------------
// _populateticker()- Pre-populates the two DIVs of the scroller with the 1st and 2nd RSS entries.
// -------------------------------------------------------------------

gfeedpausescroller.prototype._populateticker = function( feeds )
{
	gfeedfetcher._sortarray( feeds, this.sortstring );
	
	//set width of inner DIVs to outer DIV's width minus padding (padding assumed to be top padding x 2)
	this.visiblediv.style.width = this.hiddendiv.style.width = parseInt(this.tickerdivwidth)-(this.visibledivtop*2) + "px";
	
	//Adjust "itemsperpage" if needed (based on total # of avail entries)
	this.itemsperpage = (this.itemsperpage>=feeds.length)? 1 : this.itemsperpage; 

	//Get subsection of feed array based on how many entries to show at once
	var feedslice1 = feeds.slice(0, this.itemsperpage); 
	
	this.hiddendivpointer = this.itemsperpage; 
	
	//Set the feed array index of the hidden div accordingly
	var feedslice2 = feeds.slice(this.hiddendivpointer, this.hiddendivpointer+this.itemsperpage);
	
	this.visiblediv.innerHTML = formatrssmessage(feedslice1, this.showoptions, this.itemcontainer, this.linktarget);
	this.hiddendiv.innerHTML = formatrssmessage(feedslice2, this.showoptions, this.itemcontainer, this.linktarget);
	
	this._initscroller();
}


// -------------------------------------------------------------------
// _initscroller()- Initialize the scroller by setting initial positions of the two dinner DIVs, start up down animation
// -------------------------------------------------------------------

gfeedpausescroller.prototype._initscroller = function()
{
	var scrollerinstance = this;

	this.getinline(this.visiblediv, this.hiddendiv);
	
	this.hiddendiv.style.visibility= "visible";
	
	//set width of inner DIVs to outer DIV's width minus padding (padding assumed to be top padding x 2)
	this.visiblediv.style.width=this.hiddendiv.style.width=parseInt(this.tickerdivwidth)-(this.visibledivtop*2)+"px";
	
	this.tickerdiv.onmouseover=function(){scrollerinstance.mouseoverBol=1};
	
	this.tickerdiv.onmouseout=function(){scrollerinstance.mouseoverBol=0};
	
	if (window.attachEvent) //Clean up loose references in IE
		window.attachEvent("onunload", function(){scrollerinstance.tickerdiv.onmouseover=scrollerinstance.tickerdiv.onmouseout=null});
	
	setTimeout(function(){scrollerinstance._animateup()}, this.delay);
}


// -------------------------------------------------------------------
// formatrssmessage()- Global function that formats a RSS entry(s) to the desired components (title, date, description etc)
// -------------------------------------------------------------------

function formatrssmessage(feedslice, showoptions, itemcontainer, linktarget){
	//if "itemcontainer" is set to "<li>", define a "<ul>" tag to wrap around the result
	var rssoutput = "<ul class=\"echangezlist\">\n"; 

	//Loop through the entered slice of a RSS feed (1 or more entries)
	for (var i = 0 ; i < feedslice.length; i++)
	{ 	
		var itemtitle = "<a href=\"" + feedslice[i].link + 
						"\" target=\"" + linktarget + 
						"\" class=\"echangez\">" + feedslice[i].title + "</a>";

		var itemlabel = /label/i.test(showoptions) ? '<span class="labelfield">['+feedslice[i].ddlabel+']</span>' : " ";

		var itemdescription = /description/i.test(showoptions) ? "<br />" + feedslice[i].content : /snippet/i.test(showoptions)? "<br />" + feedslice[i].contentSnippet  : "";
		
		rssoutput += "<li class=\"echangezitem\">" + itemtitle + " " + itemlabel + "\n" + itemdescription + "</li>" + "\n\n";
	}

	rssoutput += "</ul>\n";

	return rssoutput;
}


// -------------------------------------------------------------------
// _animateup()- Move the two inner divs of the scroller up and in sync
// -------------------------------------------------------------------

gfeedpausescroller.prototype._animateup=function(){
	var scrollerinstance = this;
	if (parseInt(this.hiddendiv.style.top)>(this.visibledivtop+5))
	{
		this.visiblediv.style.top=parseInt(this.visiblediv.style.top)-5+"px";
		this.hiddendiv.style.top=parseInt(this.hiddendiv.style.top)-5+"px";
		setTimeout(function(){scrollerinstance._animateup()}, 40);
	}
	else
	{
		this.getinline(this.hiddendiv, this.visiblediv);
		this._swapdivs();
		setTimeout(function(){scrollerinstance._rotatemessage()}, this.delay);
	}
}


// -------------------------------------------------------------------
// _swapdivs()- Swap between which is the visible and which is the hidden div
// -------------------------------------------------------------------

gfeedpausescroller.prototype._swapdivs = function()
{
	var tempcontainer = this.visiblediv;
	this.visiblediv = this.hiddendiv;
	this.hiddendiv = tempcontainer;
}

gfeedpausescroller.prototype.getinline = function(div1, div2)
{
	div1.style.top = this.visibledivtop + "px";
	div2.style.top = Math.max(div1.parentNode.offsetHeight || this.tickerdivheight, div1.offsetHeight) + "px";
}


// -------------------------------------------------------------------
// _rotatemessage()- Populate the hidden div with the next message before it's visible
// -------------------------------------------------------------------

gfeedpausescroller.prototype._rotatemessage = function()
{
	var scrollerinstance = this;
	if (this.mouseoverBol == 1) //if mouse is currently over scoller, do nothing (pause it)
		setTimeout(function(){scrollerinstance._rotatemessage()}, 100);
	else
	{
		var i = this.hiddendivpointer;
		var ceiling = this.feeds.length;
		this.hiddendivpointer = (i + this.itemsperpage > ceiling - 1 ) ? 0 : i + this.itemsperpage;
		var feedslice = this.feeds.slice(this.hiddendivpointer, this.hiddendivpointer + this.itemsperpage);
		this.hiddendiv.innerHTML = formatrssmessage(feedslice, this.showoptions, this.itemcontainer, this.linktarget);
		this._animateup();
	}
}