// JavaScript ACCORDION
// Script pro navigaci

var Accordion =
{
	init: function()
	{
		var accordions = Core.getElementsByClass("accordion");
		for(var i=0; i<accordions.length; i++)
		{
			var folds = accordions[i].childNodes;
			for(var j=0; j<folds.length; j++)
			{
				if(folds[j].nodeType==1)
				{
					Accordion.collapse(folds[j]);
					var foldLinks = folds[j].getElementsByTagName("a");
					var foldTitleLink = foldLinks[0];
					Core.addEventListener(foldTitleLink, "click", Accordion.clickListener);
					
					for(var k=1; k<foldLinks.length; k++)
					{
						Core.addEventListener(foldLinks[k], "fokus", Accordion.focusListener);
					}
				}
			}
			if(location.hash.length>1)
			{
				var activeFold = document.getElementById(location.hash.substring(1));
				if(activeFold && activeFold.parentNode == accordions[i])
				{
					Accordion.expand(activeFold);
				}
			}
		}
	},

//Metoda, která sbaluje záhyb	
collapse: function(fold)
{
	Core.removeClass(fold, "expanded");
	Core.addClass(fold, "collapsed");
},

//Metoda, která sbaluje všechny záhyby
collapseAll: function(accordion)
{
	var folds = accordion.childNodes;
	for (var i=0; i<folds.length; i++)
	{
		if(folds[i].nodeType==1)
		{
			Accordion.collapse(folds[i]);
		}
	}
},

//Metoda, která rozbaluje rozbaluje záhyb
expand: function(fold)
{
	Accordion.collapseAll(fold.parentNode);
	Core.removeClass(fold, "collapsed");
	Core.addClass(fold, "expanded");
},

//Posluchač událostí reagující na kliknutí
clickListener: function(event)
{
	var fold = this.parentNode.parentNode;
	if(Core.hasClass(fold, "collapsed"))
	{
		Accordion.expand(fold);
	}
	else
	{
		Accordion.collapse(fold);
	}
	//Core.preventDefault(event);
},

//Posluchač událostí focus, který rozbaluje záhyb při najetí klávesou TAB
focusListener: function(event)
{
	var element = this;
	while (element.parentNode)
	{
		if(element.parentNode.className=="accordion")
		{
			Accordion.expand(element);
			return;
		}
		element = element.parentNode;
	}
}

};
Core.start(Accordion);