/* PARAMETRAGE */
var conteneurId="scroller"; // Nom du conteneur de news utilisé dans la page html
var conteneurCss=conteneurId; // par défaut, le nom du style en css est le même que celui du conteneur
var typenoeud="DIV"; // permet de choisir tout type de noeud de contenu structuré : DIV; TR; TD; ...
var delai=5000; // délai de pause en ms pour la lecture d'une news


// -------------------------------------------------------------------
// initialize()- Initialize scroller content.
// Get nodetype content; construct the table of news
// -------------------------------------------------------------------

function init_scroll() // Construit le tableau de contenu des news
{	
	if ($('scroller')!=null)
	{
		var news=new Array(); // tableau qui accueille les contenus
		var numero = 0; // initialisation du compteur de news
		/* Parse l'ensemble du contenu du div "Scroller" pour filtrer les noeuds */
		for(var i = 0; i < $(conteneurId).childNodes.length; i++)
		{
			/* vérifie que le noeud est du type typenoeud, permet d'éliminer les commentaires, attributs et autres types de noeuds */

			if($(conteneurId).childNodes[i].nodeName == typenoeud)
			{
				news[numero] = $(conteneurId).childNodes[i].innerHTML; //construit le tableau en ajoutant la news i
				numero++; // passe à la ligne de tableau suivante
				//alert($(conteneurId).childNodes[i].innerHTML)
			}
			
		}
		/* Activation du scroller à partir de 2 bloc news */
		if(numero > 1)
		{
			new pausescroller(news, conteneurId, conteneurCss, delai)
		}
	}
}


// -------------------------------------------------------------------
// Interrupt scrolling when mouse is over the news
// -------------------------------------------------------------------

function pausescroller(content, divId, divClass, delay){
this.content=content //message array content
this.tickerid=divId //ID of ticker div to display information
this.delay=delay //Delay between msg change, in miliseconds.
this.mouseoverBol=0 //Boolean to indicate whether mouse is currently over scroller (and pause it if it is)
this.hiddendivpointer=1 //index of message array for hidden div
document.getElementById(divId).className=divClass;
document.getElementById(divId).innerHTML = '<div class="innerDiv" style="position: absolute; width: 100%" id="'+divId+'1">'+content[0]+'</div><div class="innerDiv" style="position: absolute; width: 100%; visibility: hidden" id="'+divId+'2">'+content[1]+'</div>';
var scrollerinstance=this
setTimeout(function(){scrollerinstance.initialize()}, 500)
}

// -------------------------------------------------------------------
// initialize()- Initialize scroller method.
// -Get div objects, set initial positions, start up down animation
// -------------------------------------------------------------------

pausescroller.prototype.initialize=function(){
this.tickerdiv=document.getElementById(this.tickerid)
this.visiblediv=document.getElementById(this.tickerid+"1")
this.hiddendiv=document.getElementById(this.tickerid+"2")
this.visibledivtop=parseInt(pausescroller.getCSSpadding(this.tickerdiv))
//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=this.tickerdiv.offsetWidth-(this.visibledivtop*2)+"px"
this.getinline(this.visiblediv, this.hiddendiv)
this.hiddendiv.style.visibility="visible"
var scrollerinstance=this
document.getElementById(this.tickerid).onmouseover=function(){scrollerinstance.mouseoverBol=1}
document.getElementById(this.tickerid).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)
}


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

pausescroller.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()}, 50)
}
else{
this.getinline(this.hiddendiv, this.visiblediv)
this.swapdivs()
setTimeout(function(){scrollerinstance.setmessage()}, this.delay)
}
}

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

pausescroller.prototype.swapdivs=function(){
var tempcontainer=this.visiblediv
this.visiblediv=this.hiddendiv
this.hiddendiv=tempcontainer
}

pausescroller.prototype.getinline=function(div1, div2){
div1.style.top=this.visibledivtop+"px"
div2.style.top=Math.max(div1.parentNode.offsetHeight, div1.offsetHeight)+"px"

}

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

pausescroller.prototype.setmessage=function(){
var scrollerinstance=this
if (this.mouseoverBol==1) //if mouse is currently over scoller, do nothing (pause it)
setTimeout(function(){scrollerinstance.setmessage()}, 100)
else{
var i=this.hiddendivpointer
var ceiling=this.content.length
this.hiddendivpointer=(i+1>ceiling-1)? 0 : i+1
this.hiddendiv.innerHTML=this.content[this.hiddendivpointer]
this.animateup()
}
}

pausescroller.getCSSpadding=function(tickerobj){ //get CSS padding value, if any
if (tickerobj.currentStyle)
return tickerobj.currentStyle["paddingTop"]
else if (window.getComputedStyle) //if DOM2
return window.getComputedStyle(tickerobj, "").getPropertyValue("padding-top")
else
return 0
}

Event.observe(window,"load",init_scroll,false);