//Copyright Chris Xiong 2017
//License: Expat (MIT)
var fold=true;
function setupevents()
{
	window.ontouchstart=function(e)
	{
		x1=e.touches[0].screenX;
		y1=e.touches[0].screenY;
	}
	window.ontouchmove=function(e)
	{
		x2=e.touches[0].screenX;
		y2=e.touches[0].screenY;
	}
	window.ontouchend=function(e)
	{
		x2=e.changedTouches[0].screenX;
		y2=e.changedTouches[0].screenY;
		if(Math.abs(x1-x2)<20&&Math.abs(y1-y2)<20)
		{
			if(x2<document.getElementById("panel").getClientRects()[0].right&&fold)
			{document.getElementById("panel").style.left="0";fold=false;}
			if(x2>document.getElementById("panel").getClientRects()[0].right&&!fold)
			{document.getElementById("panel").style.left="-15em";fold=true;}
		}
		if(x2-x1>window.innerWidth*0.2)
		{document.getElementById("panel").style.left="0";fold=false;}
		if(x1-x2>window.innerWidth*0.2)
		{document.getElementById("panel").style.left="-15em";fold=true;}
	}
	document.getElementById("panel").onmouseenter=function()
	{
		if(fold)
		{document.getElementById("panel").style.left="0";fold=false;}
	}
	document.getElementById("panel").onmouseleave=function()
	{
		if(!fold)
		{document.getElementById("panel").style.left="-15em";fold=true;}
	}
	document.getElementById("panel").classList.remove("collapsed");
	document.getElementById("content").classList.remove("expanded");
}
function unsetevents()
{
	window.ontouchstart=undefined;
	window.ontouchmove=undefined;
	window.ontouchend=undefined;
	const p=document.getElementById("panel");
	p.onmouseenter=undefined;
	p.onmouseleave=undefined;
	p.style.left=null;
	if (!p.classList.contains("collapsed"))
		document.getElementById("paneltoggle").innerHTML="«";
}
function togglepanel()
{
	let c = document.getElementById("panel").classList.toggle("collapsed");
	if (c) document.getElementById("content").classList.add("expanded");
	else document.getElementById("content").classList.remove("expanded");
	document.getElementById("paneltoggle").innerHTML=c?"»":"«";
}