/*
	file:		cms_ticker.js
	project:	css2 based ticker for cms-project
	author:		Ueli Leutwyler
	copyright:	insign gmbh
	version:	1.3
	last update:7.5.03

	history:
	30.01.05	CSS2-Position
	07.05.03	if only one news was added, a copy of it is created to grantee seamless scrolling
	19.03.03	faster, slower, setSpeed added
	17.03.03	start
*/

// cmsticker class
function cmsticker(name,width,height,speed,pause,initText)
{
	this.name	= name;
	this.initialized 	= false;
	this.created 		= false;
	this.paused			= true;
	this.turbo			= false;
	if(!document.getElementById) return false;

	this.placer = null;
	this.initText = initText?initText:"loading...";
	this.id		= Math.round(Math.random()*100);
	this.speed  = speed?speed:50;
	this.waittime= pause?(pause*1000):2000;
	this.pos	= 0;
	this.newscounter = 0;
	this.news	= new Array();
	this.width	= width;
	this.height = height;
	this.timeHandler = null;
	this.running = false;

	// generate div-tags
	document.write("<div id=\"tickerplacer"+this.id+"\">"+this.initText+"</div>");
	document.write("<div id=\"tickerwindow"+this.id+"\" STYLE=\"position:relative; left:0; top:0; width:"+width+"px ; height:"+height+"px ;overflow:hidden;visibility:hidden\"></div>");

	this.placer	= document.getElementById("tickerplacer"+this.id);
	if(!this.placer)
	{
		alert("internal error: could not load placer object");
		return false;
	}
	
	this.tickerwindow	= document.getElementById("tickerwindow"+this.id);
	
	if(!this.tickerwindow)
	{
		alert("internal error: could not load ticker_window object");
		return false;
	}	

	this.created = true;

	// mehthod
	this.start 	= cmsticker_start;
	this.init 	= cmsticker_init;
	this.addNews= cmsticker_addNews;
	this.tick	= cmsticker_tick;
	this.pause	= cmsticker_pause;
	this.stop	= cmsticker_stop;
	this.cont	= cmsticker_cont;
	this.setSpeed = cmsticker_setSpeed;
	this.slower	= cmsticker_slower;
	this.faster = cmsticker_faster;

	return true;	
}

function cmsticker_faster(amount)
{
	if(!amount) amount = 20;
	this.speed -=amount;
	if(this.speed<1) this.speed=1;
}

function cmsticker_slower(amount)
{
	if(!amount) amount = 20;
	this.speed +=amount;
	if(this.speed>100) this.speed=100;
}


// methods cmsticker
function cmsticker_setSpeed(speed)
{
	this.speed = speed
}

function cmsticker_addNews(id,myobject)
{
if(id)
	myNews = document.getElementById(id);
else
	myNews = myobject;
	if(!myNews)
	{
		alert("Die Neuigkeit mit der id '"+id+"' konnte nicht gefunden werden");
		this.initialized=false;
		return false;
	}
	
	this.tickerwindow.appendChild(myNews);
	myNews.style.position="absolute";
	myNews.style.height = this.height;
	myNews.style.width = this.width;
	myNews.style.overflow="hidden";
	myNews.style.visibility="hidden";
	this.news[this.news.length] = myNews;
}

function cmsticker_init()
{
	if(!this.created) return;
	//y = findPosY(this.placer);
	//x = findPosX(this.placer);
	
	// set position of tickerwindow according to placer
	//this.tickerwindow.style.posTop = y;
	//this.tickerwindow.style.posLeft = x;
	//this.tickerwindow.style.top = y;
	//this.tickerwindow.style.left = x;
	// set visibility of placer and Tickerwindow
	this.tickerwindow.style.visibility = "visible";
	this.placer.style.visibility = "hidden";
	// check if only one news is added and add copy of it if so
if(this.news.length==1)
{
		clone = this.news[0].cloneNode(true);
		clone.id +="_clone";
//		this.news[0].insertBefore(clone,this.news[0]);
		this.addNews(null,clone);
	}
	this.initialized = true;
	return true;
}

function cmsticker_start()
{
	if(!this.initialized)
	{
		if(!this.init()) return false;
	}
	if(!this.news[this.newscounter]) return false;;
	// prepare current news
	this.paused = false;
	this.news[this.newscounter].style.posTop = this.height + "px";	
	this.news[this.newscounter].style.top = this.height + "px";	
	this.news[this.newscounter].style.visibility="visible";
	to = this.name+".tick()";
	this.timeHandler=setTimeout(to,this.speed);
}

function cmsticker_tick()
{
	this.running = true;
	this.pos+=1;
	if(this.pos>this.height) 
	{
		this.pause();
		return;
	}
	else
	{
		// set layer
		prev = this.newscounter-1;
		if(prev<0) prev=this.news.length-1;
		this.news[this.newscounter].style.posTop=this.height-this.pos  + "px";
		this.news[this.newscounter].style.top =this.height-this.pos + "px";

		this.news[prev].style.posTop=-this.pos  + "px";
		this.news[prev].style.top =-this.pos + "px";

		to = this.name+".tick()";
		this.timeHandler=setTimeout(to,this.turbo?1:this.speed);
	}
}

function cmsticker_pause()
{
	this.paused =true;
	this.turbo=false;
	this.pos=0;
	this.newscounter++;
	if(this.newscounter>=this.news.length) this.newscounter=0;

	this.running = false;
	to = this.name+".start()";
	this.timeHandler=setTimeout(to,this.waittime);	
}

function cmsticker_stop()
{
	clearTimeout(this.timeHandler);
	this.running = false;
}



function cmsticker_cont()

{

	if(!this.running&&this.initialized) 

	{

		clearTimeout(this.timeHandler);

		if(this.paused)

			this.start();

		else

			this.tick();	

	}

	else if(this.paused)

		this.start();

	else

		this.turbo=true;

}

	



// function to evaluate position of objects



function findPosX(obj)

{

	var curleft = 0;

	if (obj.offsetParent)

	{

		while (obj.offsetParent)

		{

			curleft += obj.offsetLeft

			obj = obj.offsetParent;

		}

	}

	else if (obj.x)

		curleft += obj.x;

	return curleft;

}



function findPosY(obj)

{

	var curtop = 0;

	if (obj.offsetParent)

	{

		while (obj.offsetParent)

		{

			curtop += obj.offsetTop

			obj = obj.offsetParent;

		}

	}

	else if (obj.y)

		curtop += obj.y;

	return curtop;

}