var feedfetcher_loading_image="modules/mod_pgt_rssscroller/ajax-loader.gif"
function PGTFeedControl(feedData,container,options){this.nodes={};this.feeds=[];this.results=[];container=document.getElementById(container);container.innerHTML='<img src="'+feedfetcher_loading_image+'" /> Loading RSS feed(s)'
for(var i=0;i<feedData.length;i++){var o={};o=feedData[i];if(o&&o.title){var s=o.title;o.title=s.replace(/</g,'&lt;').replace(/>/g,'&gt;');}
this.feeds.push(o);}
this.parseOptions_(options);this.setup_(container);}
PGTFeedControl.DEFAULT_TOT_RESULTS=20;PGTFeedControl.DEFAULT_DISPLAY_TIME=5000;PGTFeedControl.DEFAULT_TRANSITION_TIME=1000;PGTFeedControl.DEFAULT_SCROLL_METHOD="block";PGTFeedControl.prototype.parseOptions_=function(options){this.options={totResults:PGTFeedControl.DEFAULT_TOT_RESULTS,linkTarget:google.feeds.LINK_TARGET_BLANK,displayTime:PGTFeedControl.DEFAULT_DISPLAY_TIME,transitionTime:PGTFeedControl.DEFAULT_TRANSITION_TIME,nFeedPage:1,scrollMethod:PGTFeedControl.DEFAULT_SCROLL_METHOD,pauseOnHover:true,showTitle:false,showDate:false,showBody:1,instanceId:""};if(options){for(var o in this.options){if(typeof options[o]!='undefined'){this.options[o]=options[o];}}}
this.started=false;};PGTFeedControl.prototype.setup_=function(container){if(container==null)return;this.nodes.container=container;if(window.ActiveXObject){this.ie=this[window.XMLHttpRequest?'ie7':'ie6']=true;}else if(document.childNodes&&!document.all&&!navigator.taintEnabled){this.safari=true;}else if(document.getBoxObjectFor!=null){this.gecko=true;}
this.feedControl=new google.feeds.FeedControl();this.feedControl.setLinkTarget(this.options.linkTarget);this.expected=this.feeds.length;this.errors=0;this.saveTransition=false;for(var i=0;i<this.feeds.length;i++){var lfeed=new google.feeds.Feed(this.feeds[i].furl);lfeed.setResultFormat(google.feeds.Feed.JSON_FORMAT);lfeed.setNumEntries(this.feeds[i].max);lfeed.load(this.bind_(this.feedLoaded_,i));}};PGTFeedControl.prototype.bind_=function(method){var self=this;var opt_args=[].slice.call(arguments,1);return function(){var args=opt_args.concat([].slice.call(arguments));return method.apply(self,args);}};PGTFeedControl.prototype.createSubContainers_=function(){var container=this.nodes.container;this.clearNode_(container);var counter=document.getElementsByName("fc-outer").length+1;var el=document.createElement("div");el.className="fc-outer";el.id=this.options.instanceId+"outer-0";container.appendChild(el);this.outer0=el;container=document.getElementById(this.options.instanceId+"outer-0");if(this.options.pauseOnHover){el.onmouseover=this.bind_(this.mouseOver_);el.onmouseout=this.bind_(this.mouseOut_);}
for(var i=0;i<=this.options.nFeedPage;i++){var el=document.createElement("div");el.className="fc-inner";el.id=this.options.instanceId+"inner-"+i;container.appendChild(el);if(i==0){this.inner0=el;if(this.options.scrollMethod=="fade"){var el=document.createElement("div");el.className="fc-overlay";el.id=this.options.instanceId+"overlay";el.style.top="0px";container.appendChild(el);this.overlay=el;this.setOpacity_(this.overlay,0.0);}}}};PGTFeedControl.prototype.feedLoaded_=function(index,result){if(result.error){if(++this.errors>=this.expected){this.nodes.container.innerHTML='Feed'+((this.expected>1)?'s ':' ')+'could not be loaded.';}
return;}
this.results[index]=result;if(!this.started){this.createSubContainers_();this.itemList=new Array();var entries=result.feed.entries;for(var i=0;i<entries.length;i++){nitem=[index,i];this.itemList.push(nitem);}
this.curItem=0;this.fadeStep=0;this.displayItems_();this.setDisplayTimer_();this.started=true;}
else{var entries=result.feed.entries;for(var i=0;i<entries.length;i++){nitem=[index,i];this.itemList.push(nitem);}}};PGTFeedControl.prototype.displayItems_=function(){var ix=this.curItem;var cheight=0;for(var i=0;i<=this.options.nFeedPage;i++){var nitem=this.itemList[ix];var container=document.getElementById(this.options.instanceId+"inner-"+i);var entry=this.results[nitem[0]].feed.entries[nitem[1]];container.innerHTML=this.feedFormat_(entry,this.feeds[nitem[0]].title);container.style.top=cheight+'px';cheight+=container.offsetHeight;if(this.options.scrollMethod=="fade"&&i==0){this.overlay.style.height=cheight+'px';}
if(this.options.scrollMethod!="roll"){if(i==this.options.nFeedPage-1){this.outerheight=cheight;this.outer0.style.height=this.outerheight+'px';}}
else{if(i==this.options.nFeedPage)
this.outer0.style.height=cheight+'px';}
if(++ix>=this.itemList.length)
ix=0;}};PGTFeedControl.prototype.displayNextEntry_=function(){this.fadeStep=0;this.setOpacity_(this.overlay,0.0);this.outer0.style.top='0px';if(++this.curItem>=this.itemList.length)
this.curItem=0;this.displayItems_();};PGTFeedControl.prototype.feedFormat_=function(feed,title){var rssoutput="<ul>\n";rssoutput+="<a href=\""+feed.link+"\" target=\""+this.options.linktarget+"\" class=\"rsstitle\">"+feed.title+"</a><br />"
if(this.options.showTitle)
rssoutput+="<span class=\"rsslabel\">["+title+"] </span>"
if(this.options.showDate)
rssoutput+="<span class=\"rssdate\">"+this.dateFormat_(feed.publishedDate,"datetime")+"</span>"
if(this.options.showBody==1)
rssoutput+="<span class=\"rsscontent\">"+feed.contentSnippet+"</span>"
else if(this.options.showBody==2)
rssoutput+="<span class=\"rsscontent\">"+feed.content+"</span>"
rssoutput+="</ul>\n"
return rssoutput}
PGTFeedControl.prototype.dateFormat_=function(datestr,showoptions){var itemdate=new Date(datestr);var parseddate=isNaN(itemdate.getTime())?"":((showoptions.indexOf("datetime")!=-1)?itemdate.toLocaleString():(showoptions.indexOf("date")!=-1)?itemdate.toLocaleDateString():(showoptions.indexOf("time")!=-1)?itemdate.toLocaleTimeString():"");if(parseddate.length)
parseddate+="<br />";return parseddate}
PGTFeedControl.prototype.setDisplayTimer_=function(){if(this.displayTimer){this.clearDisplayTimer_();}
if(this.options.scrollMethod=="roll")
this.setTransitionTimer_();else{var cb=this.bind_(this.outDisplayTimer_);this.displayTimer=setInterval(cb,this.options.displayTime);}};PGTFeedControl.prototype.setTransitionTimer_=function(){this.clearTransitionTimer_();var cb=this.bind_(this.outTransitionTimer_);if(this.options.scrollMethod!="roll")
this.transitionTimer=setInterval(cb,(this.options.transitionTime/100));else
this.transitionTimer=setInterval(cb,(this.options.transitionTime));};PGTFeedControl.prototype.clearDisplayTimer_=function(){if(this.displayTimer){clearTimeout(this.displayTimer);this.displayTimer=null;}};PGTFeedControl.prototype.clearTransitionTimer_=function(){if(this.transitionTimer){clearInterval(this.transitionTimer);this.transitionTimer=null;}};PGTFeedControl.prototype.outDisplayTimer_=function(){if(this.options.scrollMethod=="block")
this.displayNextEntry_();else if(this.options.scrollMethod=="fade"){this.setTransitionTimer_();}else if(this.options.scrollMethod=="scroll"||this.options.scrollMethod=="scroll2"){this.setTransitionTimer_();}};PGTFeedControl.prototype.outTransitionTimer_=function(){if(this.options.scrollMethod=="fade"){this.inner0.style.top=-Math.round((this.inner0.offsetHeight/100.0)*this.fadeStep)+'px';this.setOpacity_(this.overlay,this.fadeStep/100.0);if(++this.fadeStep>=100){this.displayNextEntry_();this.clearTransitionTimer_();}}else if(this.options.scrollMethod=="scroll"){var delta=Math.round((this.inner0.offsetHeight/100.0)*this.fadeStep);this.outer0.style.top=-delta+'px';this.outer0.style.height=(this.outerheight+delta)+'px';if(++this.fadeStep>=100){this.displayNextEntry_();this.clearTransitionTimer_();}}else if(this.options.scrollMethod=="scroll2"){var delta=Math.round((this.inner0.offsetHeight/10.0)*Math.sqrt(this.fadeStep));this.outer0.style.top=-delta+'px';this.outer0.style.height=(this.outerheight+delta)+'px';if(++this.fadeStep>=100){this.displayNextEntry_();this.clearTransitionTimer_();}}else if(this.options.scrollMethod=="roll"){this.fadeStep++;this.outer0.style.top=-this.fadeStep+'px';if(this.fadeStep==this.inner0.offsetHeight){this.fadeStep=0;this.displayNextEntry_();}}};PGTFeedControl.prototype.setOpacity_=function(node,opacity){if(node==null)
return;opacity=Math.max(0,Math.min(1,opacity));if(opacity==0){if(node.style.visibility!='hidden'){node.style.visibility='hidden';}}else{if(node.style.visibility!='visible'){node.style.visibility='visible';}}
if(this.ie){var normalized=Math.round(opacity*100);node.style.filter='alpha(opacity='+normalized+')';}
node.style.opacity=node.opacity=opacity;};PGTFeedControl.prototype.clearNode_=function(node){if(node==null)
return;var child;while((child=node.firstChild)){node.removeChild(child);}};PGTFeedControl.prototype.mouseOver_=function(){this.saveTransition=(this.transitionTimer!=null);this.clearTransitionTimer_();this.clearDisplayTimer_();}
PGTFeedControl.prototype.mouseOut_=function(){this.setDisplayTimer_();if(this.saveTransition)
this.setTransitionTimer_();}/* ===== 
 * @fileoverview RSS feed scroller based on Google Aiax API for feeds fetching
 * @author <a href="mailto:info@pagit.eu">Paolo Geninatti</a>
 * @version 1.0.1
 * =====
 */

var feedfetcher_loading_image="modules/mod_pgt_rssscroller/ajax-loader.gif"

//===== Initializations ===============================================================================================

function PGTFeedControl(feedData, container, options) {
	this.nodes = {};
  	this.feeds = [];
  	this.results = [];

    container = document.getElementById(container);
	container.innerHTML='<img src="'+feedfetcher_loading_image+'" /> Loading RSS feed(s)'

    for (var i=0; i<feedData.length; i++) {
      	var o = {};
        o = feedData[i];
		if (o && o.title) {
	  		var s = o.title;
	  		o.title = s.replace(/</g,'&lt;').replace(/>/g, '&gt;');
		}
      	this.feeds.push(o);
  	}
  	this.parseOptions_(options);
  	this.setup_(container);
}

PGTFeedControl.DEFAULT_TOT_RESULTS = 20;
PGTFeedControl.DEFAULT_DISPLAY_TIME = 5000;
PGTFeedControl.DEFAULT_TRANSITION_TIME = 1000;
PGTFeedControl.DEFAULT_SCROLL_METHOD = "block";

PGTFeedControl.prototype.parseOptions_ = function(options) {
  	this.options = {
    	totResults : PGTFeedControl.DEFAULT_TOT_RESULTS,			// total number of feeds
    	linkTarget : google.feeds.LINK_TARGET_BLANK,				// link target
    	displayTime : PGTFeedControl.DEFAULT_DISPLAY_TIME,			// display time for each feed
    	transitionTime : PGTFeedControl.DEFAULT_TRANSITION_TIME,	// transition time for each feed
		nFeedPage : 1,												// number of feed per page
		scrollMethod : PGTFeedControl.DEFAULT_SCROLL_METHOD,		// scrolling method
																	//  'block'
																	//  'fade'
																	//  'scroll'
																	//  'roll'
		pauseOnHover : true, 										// pause on mouse hover			
		showTitle : false,											// show RSS source title
		showDate : false,											// show RSS feed date			
		showBody : 1,												// show RSS feed body: 0:no, 1:snippet, 2:full			
		instanceId : ""												// univoque instance id														
  	};

  	if (options) {
    	for (var o in this.options) {
      		if (typeof options[o] != 'undefined') {
      			this.options[o] = options[o];
			}
    	}
  	}
	this.started = false;
};

PGTFeedControl.prototype.setup_ = function(container) {
	if (container == null) return;
  	this.nodes.container = container;

	// Browser check
  	if (window.ActiveXObject) {
    	this.ie = this[window.XMLHttpRequest ? 'ie7' : 'ie6'] = true;
  	} else if (document.childNodes && !document.all && !navigator.taintEnabled) {
    	this.safari = true;
  	} else if (document.getBoxObjectFor != null) {
    	this.gecko = true;
  	}
	
  	this.feedControl = new google.feeds.FeedControl();
  	this.feedControl.setLinkTarget(this.options.linkTarget);

  	this.expected = this.feeds.length;
  	this.errors = 0;
	this.saveTransition= false;

  	for (var i = 0; i < this.feeds.length; i++) {
    	var lfeed = new google.feeds.Feed(this.feeds[i].furl);
    	lfeed.setResultFormat(google.feeds.Feed.JSON_FORMAT);
    	lfeed.setNumEntries(this.feeds[i].max);
    	lfeed.load(this.bind_(this.feedLoaded_, i));
  	}
};

PGTFeedControl.prototype.bind_ = function(method) {
  	var self = this;
  	var opt_args = [].slice.call(arguments, 1);
  	return function() {
    	var args = opt_args.concat([].slice.call(arguments));
    	return method.apply(self, args);
  	}
};

PGTFeedControl.prototype.createSubContainers_ = function() {
  	var container = this.nodes.container;
  	this.clearNode_(container);

   	var counter = document.getElementsByName("fc-outer").length + 1;
	var el = document.createElement("div");
	el.className = "fc-outer";
	el.id = this.options.instanceId + "outer-0";
	container.appendChild(el);
	this.outer0 = el;
	container = document.getElementById(this.options.instanceId + "outer-0");	
    if (this.options.pauseOnHover) {
       	el.onmouseover = this.bind_(this.mouseOver_);
      	el.onmouseout = this.bind_(this.mouseOut_);
    }
	
	for (var i = 0; i <= this.options.nFeedPage; i++) {
		var el = document.createElement("div");
		el.className = "fc-inner";
		el.id = this.options.instanceId + "inner-"+i;
		container.appendChild(el);
		if (i==0) {
			this.inner0 = el;
			if (this.options.scrollMethod == "fade") {
				var el = document.createElement("div");
				el.className = "fc-overlay";
				el.id = this.options.instanceId + "overlay";
				el.style.top = "0px";
				container.appendChild(el);
				this.overlay = el;
			    this.setOpacity_(this.overlay, 0.0);			
			}
		}
	}
};

PGTFeedControl.prototype.feedLoaded_ = function(index, result) {
  	if (result.error) {
	    if (++this.errors >= this.expected) {
      		this.nodes.container.innerHTML = 'Feed' + ((this.expected > 1)?'s ':' ') + 'could not be loaded.';
    	}
    return;
  	}
  	
	this.results[index]=result;

  	if (!this.started) {
    	this.createSubContainers_();
		this.itemList = new Array();
		var entries = result.feed.entries;
		for (var i = 0; i < entries.length; i++) {
			nitem =  [index, i];
			this.itemList.push(nitem);
		}
		this.curItem = 0;
		this.fadeStep = 0;			
  		this.displayItems_();
  		this.setDisplayTimer_();
  		this.started = true;
  	} 
	else {
		var entries = result.feed.entries;
		for (var i = 0; i < entries.length; i++) {
			nitem =  [index, i];
			this.itemList.push(nitem);
		}		
	}
};

//===== Display items ===============================================================================================

PGTFeedControl.prototype.displayItems_ = function() {
  	var ix = this.curItem;
	var cheight = 0;
	for (var i = 0; i <= this.options.nFeedPage; i++) {
		var nitem = this.itemList[ix];
    	var container = document.getElementById(this.options.instanceId + "inner-"+i);
	  	var entry = this.results[nitem[0]].feed.entries[nitem[1]];		
		container.innerHTML=this.feedFormat_(entry, this.feeds[nitem[0]].title);
		container.style.top = cheight + 'px';
		cheight += container.offsetHeight;
		if (this.options.scrollMethod == "fade" && i==0) {
			this.overlay.style.height = cheight + 'px';
		}
		if (this.options.scrollMethod != "roll") {
			if (i==this.options.nFeedPage-1) {
				this.outerheight = cheight;
				this.outer0.style.height = this.outerheight + 'px';
			}
		}
		else {
			if (i==this.options.nFeedPage) 
				this.outer0.style.height = cheight + 'px';
		}
		if (++ix >= this.itemList.length)
			ix=0;
	}
};

PGTFeedControl.prototype.displayNextEntry_ = function() {
	this.fadeStep = 0;		
    this.setOpacity_(this.overlay, 0.0);		
	this.outer0.style.top = '0px';
	if (++this.curItem >= this.itemList.length)
		this.curItem=0;
	this.displayItems_();
};

PGTFeedControl.prototype.feedFormat_ = function(feed, title) {
	var rssoutput="<ul>\n";
	rssoutput += "<a href=\"" + feed.link + "\" target=\"" + this.options.linktarget + "\" class=\"rsstitle\">" + feed.title + "</a><br />"
	if (this.options.showTitle)
		rssoutput += "<span class=\"rsslabel\">[" + title + "] </span>"
	if (this.options.showDate)
		rssoutput += "<span class=\"rssdate\">" + this.dateFormat_(feed.publishedDate, "datetime") + "</span>" 
	if (this.options.showBody == 1)	
		rssoutput += "<span class=\"rsscontent\">" + feed.contentSnippet + "</span>" 
	else if (this.options.showBody == 2)	
		rssoutput += "<span class=\"rsscontent\">" + feed.content + "</span>" 		
	rssoutput += "</ul>\n"
	return rssoutput
}

PGTFeedControl.prototype.dateFormat_ =function(datestr, showoptions) {
	var itemdate=new Date(datestr);
	var parseddate= isNaN(itemdate.getTime()) ? "" : ((showoptions.indexOf("datetime")!=-1)? itemdate.toLocaleString() : (showoptions.indexOf("date")!=-1)? itemdate.toLocaleDateString() : (showoptions.indexOf("time")!=-1)? itemdate.toLocaleTimeString() : "" );
	if (parseddate.length)
		parseddate += "<br />";
	return parseddate
}

//===== Animations ===============================================================================================

PGTFeedControl.prototype.setDisplayTimer_ = function() {
  	if (this.displayTimer) {
    	this.clearDisplayTimer_();
  	}
	if (this.options.scrollMethod == "roll")
		// in "roll" mode displayTimer is not used;	
		this.setTransitionTimer_();	
	else {
	  	var cb = this.bind_(this.outDisplayTimer_);
  		this.displayTimer = setInterval(cb, this.options.displayTime);
	}
};

PGTFeedControl.prototype.setTransitionTimer_ = function() {
  	this.clearTransitionTimer_();
  	var cb = this.bind_(this.outTransitionTimer_);
	if (this.options.scrollMethod != "roll") 
	  	this.transitionTimer = setInterval(cb, (this.options.transitionTime / 100));
	else
	  	this.transitionTimer = setInterval(cb, (this.options.transitionTime));
};

PGTFeedControl.prototype.clearDisplayTimer_ = function() {
  	if (this.displayTimer) {
    	clearTimeout(this.displayTimer);
    	this.displayTimer = null;
  	}
};

PGTFeedControl.prototype.clearTransitionTimer_ = function() {
  	if (this.transitionTimer) {
    	clearInterval(this.transitionTimer);
    	this.transitionTimer = null;
  	}
};

PGTFeedControl.prototype.outDisplayTimer_ = function() {
	if (this.options.scrollMethod == "block")
  		this.displayNextEntry_();
	else if (this.options.scrollMethod == "fade") { 
		this.setTransitionTimer_();	
	} else if ( this.options.scrollMethod == "scroll" || this.options.scrollMethod == "scroll2" ) {
		this.setTransitionTimer_();	
	}	
};

PGTFeedControl.prototype.outTransitionTimer_ = function() {
	if (this.options.scrollMethod == "fade") {
		this.inner0.style.top = -Math.round((this.inner0.offsetHeight/100.0) * this.fadeStep) + 'px';
		this.setOpacity_(this.overlay, this.fadeStep/100.0);
		if (++this.fadeStep >= 100) {
			this.displayNextEntry_();			
			this.clearTransitionTimer_();
		}		
	} else if (this.options.scrollMethod == "scroll") {
		var delta = Math.round((this.inner0.offsetHeight/100.0) * this.fadeStep);
		this.outer0.style.top = -delta + 'px';
		this.outer0.style.height = (this.outerheight + delta) + 'px';
		if (++this.fadeStep >= 100) {
			this.displayNextEntry_();			
			this.clearTransitionTimer_();
		}
	} else if (this.options.scrollMethod == "scroll2") {
		var delta = Math.round((this.inner0.offsetHeight/10.0) * Math.sqrt(this.fadeStep));
		this.outer0.style.top = -delta + 'px';
		this.outer0.style.height = (this.outerheight + delta) + 'px';
		if (++this.fadeStep >= 100) {
			this.displayNextEntry_();			
			this.clearTransitionTimer_();
		}
	} else if (this.options.scrollMethod == "roll") {
		this.fadeStep++;
		this.outer0.style.top = -this.fadeStep + 'px';
		if (this.fadeStep == this.inner0.offsetHeight) {
			this.fadeStep = 0;
			this.displayNextEntry_();			
		}
	}
};

//===== Utilities ===============================================================================================

PGTFeedControl.prototype.setOpacity_ = function(node, opacity) {
  	if (node == null) 
		return;
  	opacity = Math.max(0, Math.min(1, opacity));
  	if (opacity == 0) {
    	if (node.style.visibility != 'hidden') {
      		node.style.visibility = 'hidden';
    	}
  	} else {
    	if (node.style.visibility != 'visible') {
      		node.style.visibility = 'visible';
    	}
  	}
  	if (this.ie) {
    	var normalized = Math.round(opacity*100);
    	node.style.filter = 'alpha(opacity=' + normalized + ')';
  	}
  	node.style.opacity = node.opacity = opacity;
};

PGTFeedControl.prototype.clearNode_ = function(node) {
  	if (node == null) 
		return;
  	var child;
  	while ((child = node.firstChild)) {
    	node.removeChild(child);
  	}
};

PGTFeedControl.prototype.mouseOver_ = function() {
	this.saveTransition = (this.transitionTimer != null);
  	this.clearTransitionTimer_();
  	this.clearDisplayTimer_();
}

PGTFeedControl.prototype.mouseOut_ = function() {
    this.setDisplayTimer_();
	if (this.saveTransition)
		this.setTransitionTimer_();
}