/*
	Lightbox JS: Fullsize Image Overlays 
	by Lokesh Dhakar - http://www.huddletogether.com

	For more information on this script, visit:
	http://huddletogether.com/projects/lightbox/

	Licensed under the Creative Commons Attribution 2.5 License - http://creativecommons.org/licenses/by/2.5/
	(basically, do anything you want, just leave my name and link)
	
	Table of Contents
	-----------------
	Configuration
	
	Functions
	- getPageScroll()
	- getPageSize()
	- pause()
	- getKey()
	- listenKey()
	- showLightbox()
	- hideLightbox()
	- initLightbox()
	- addLoadEvent()
	
	Function Calls
	- addLoadEvent(initLightbox)
*/

//////////////////////////////////////////////////////////////////////////////////////////////
// Configuration
//////////////////////////////////////////////////////////////////////////////////////////////
// If you would like to use a custom loading image or close button reference them in the next two lines.
var loadingImage = '/plantillas/pltadmin/img/loading.gif';		
var closeButton = '/plantillas/pltadmin/img/close.gif';		

//
// getPageScroll()
// Returns array with x,y page scroll values.
// Core code from - quirksmode.org
//////////////////////////////////////////////////////////////////////////////////////////////

    function getPageScroll()
    {
    	var yScroll;

    	if (self.pageYOffset) {
    		yScroll = self.pageYOffset;
    	} else if (document.documentElement && document.documentElement.scrollTop){	 // Explorer 6 Strict
    		yScroll = document.documentElement.scrollTop;
    	} else if (document.body) {// all other Explorers
    		yScroll = document.body.scrollTop;
    	}
    
    	arrayPageScroll = new Array('',yScroll) 
    	return arrayPageScroll;
    }

//
// getPageSize()
// Returns array with page width, height and window width, height
// Core code from - quirksmode.org
// Edit for Firefox by pHaez
//////////////////////////////////////////////////////////////////////////////////////////////

    function getPageSize()
    {    	
    	var xScroll, yScroll;
    	
    	if (window.innerHeight && window.scrollMaxY) {	
    		xScroll = document.body.scrollWidth;
    		yScroll = window.innerHeight + window.scrollMaxY;
    	} else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac
    		xScroll = document.body.scrollWidth;
    		yScroll = document.body.scrollHeight;
    	} else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
    		xScroll = document.body.offsetWidth;
    		yScroll = document.body.offsetHeight;
    	}
    	
    	var windowWidth, windowHeight;
    	if (self.innerHeight) {	// all except Explorer
    		windowWidth = self.innerWidth;
    		windowHeight = self.innerHeight;
    	} else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
    		windowWidth = document.documentElement.clientWidth;
    		windowHeight = document.documentElement.clientHeight;
    	} else if (document.body) { // other Explorers
    		windowWidth = document.body.clientWidth;
    		windowHeight = document.body.clientHeight;
    	}	
    	
    	// for small pages with total height less then height of the viewport
    	if(yScroll < windowHeight){
    		pageHeight = windowHeight;
    	} else { 
    		pageHeight = yScroll;
    	}
    
    	// for small pages with total width less then width of the viewport
    	if(xScroll < windowWidth){	
    		pageWidth = windowWidth;
    	} else {
    		pageWidth = xScroll;
    	}
    
    
    	arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight) 
    	return arrayPageSize;
    }

//
// pause(numberMillis)
// Pauses code execution for specified time. Uses busy code, not good.
// Code from http://www.faqts.com/knowledge_base/view.phtml/aid/1602
//////////////////////////////////////////////////////////////////////////////////////////////

    function pause(numberMillis) 
    {
    	var now = new Date();
    	var exitTime = now.getTime() + numberMillis;
    	while (true) {
    		now = new Date();
    		if (now.getTime() > exitTime)
    			return;
    	}
    }

//
// getKey(key)
// Gets keycode. If 'x' is pressed then it hides the lightbox.
//////////////////////////////////////////////////////////////////////////////////////////////

    function getKey(E)
    {
    	if (e == null) { // ie
    		keycode = event.keyCode;
    	} else { // mozilla
    		keycode = e.which;
    	}
    	key = String.fromCharCode(keycode).toLowerCase();
    	
    	if(key == 'x'){ hideLightbox(); }
    }

//
// listenKey()
//////////////////////////////////////////////////////////////////////////////////////////////

    function listenKey () {	document.onkeypress = getKey; }
	
//
// showLightbox()
// Preloads images. Pleaces new image in lightbox then centers and displays.
//////////////////////////////////////////////////////////////////////////////////////////////

    function showLightbox(objLink)
    {    
    	// prep objects
    	var objOverlay = document.getElementById('overlay');
    	var objLightbox = document.getElementById('lightbox');
    	var objCaption = document.getElementById('lightboxCaption');
    	var objImage = document.getElementById('lightboxImage');
    	var objLoadingImage = document.getElementById('loadingImage');
    	var objLightboxDetails = document.getElementById('lightboxDetails');
    
    	
    	var arrayPageSize = getPageSize();
    	var arrayPageScroll = getPageScroll();
    
    	// center loadingImage if it exists
    	if (objLoadingImage) 
    	{
    		objLoadingImage.style.top = (arrayPageScroll[1] + ((arrayPageSize[3] - 35 - objLoadingImage.height) / 2) + 'px');
    		objLoadingImage.style.left = (((arrayPageSize[0] - 20 - objLoadingImage.width) / 2) + 'px');
    		objLoadingImage.style.display = 'block';
    	}
    
    	// set height of Overlay to take up whole page and show
    	objOverlay.style.height = (arrayPageSize[1] + 'px');
    	objOverlay.style.display = 'block';
    
    	// preload image
    	imgPreload = new Image();
    
    	imgPreload.onload=function()
    	{
    		objImage.src = objLink.href;
    
    		// center lightbox and make sure that the top and left values are not negative
    		// and the image placed outside the viewport
    		var lightboxTop = arrayPageScroll[1] + ((arrayPageSize[3] - 35 - imgPreload.height) / 2);
    		var lightboxLeft = ((arrayPageSize[0] - 20 - imgPreload.width) / 2);
    		
    		objLightbox.style.top = (lightboxTop < 0) ? "0px" : lightboxTop + "px";
    		objLightbox.style.left = (lightboxLeft < 0) ? "0px" : lightboxLeft + "px";
    
    		objLightboxDetails.style.width = imgPreload.width + 'px';
    		
    		if(objLink.getAttribute('title')){
    			objCaption.style.display = 'block';
    			//objCaption.style.width = imgPreload.width + 'px';
    			objCaption.innerHTML = objLink.getAttribute('title')+' [<a href="'+objImage.src+'" target="blank">Versión para imprimir</a>]';
    		} else {
    			objCaption.style.display = 'none';
    		}
    		
    		// A small pause between the image loading and displaying is required with IE,
    		// this prevents the previous image displaying for a short burst causing flicker.
    		if (navigator.appVersion.indexOf("MSIE")!=-1){
    			pause(250);
    		} 
    
    		if (objLoadingImage) {	objLoadingImage.style.display = 'none'; }
    
    		// Hide select boxes as they will 'peek' through the image in IE
    		selects = document.getElementsByTagName("select");
            for (i = 0; i != selects.length; i++) {
                    selects[i].style.visibility = "hidden";
            }
        	
    		objLightbox.style.display = 'block';
    
    		// After image is loaded, update the overlay height as the new image might have
    		// increased the overall page height.
    		arrayPageSize = getPageSize();
    		objOverlay.style.height = (arrayPageSize[1] + 'px');
    		
    		// Check for 'x' keypress
    		listenKey();
    
    		return false;
    	}
    
    	imgPreload.src = objLink.href;    	
    }

//
// hideLightbox()
//////////////////////////////////////////////////////////////////////////////////////////////

    function hideLightbox()
    {
    	// get objects
    	objOverlay = document.getElementById('overlay');
    	objLightbox = document.getElementById('lightbox');
    
    	// hide lightbox and overlay
    	objOverlay.style.display = 'none';
    	objLightbox.style.display = 'none';
    
    	// make select boxes visible
    	selects = document.getElementsByTagName("select");
        for (i = 0; i != selects.length; i++) 
        {
    		selects[i].style.visibility = "visible";
    	}
    
    	// disable keypress listener
    	document.onkeypress = '';
    }

//
// initLightbox()
// Function runs on window load, going through link tags looking for rel="lightbox".
// These links receive onclick events that enable the lightbox display for their targets.
// The function also inserts html markup at the top of the page which will be used as a
// container for the overlay pattern and the inline image.
//////////////////////////////////////////////////////////////////////////////////////////////

    function initLightbox()
    {	
    	if (!document.getElementsByTagName){ return; }
    	var anchors = document.getElementsByTagName("a");
    
    	// loop through all anchor tags
    	for (var i=0; i<anchors.length; i++){
    		var anchor = anchors[i];
    
    		if (anchor.getAttribute("href") && (anchor.getAttribute("rel") == "lightbox")){
    			anchor.onclick = function () {showLightbox(this); return false;}
    		}
    	}
    
    	// the rest of this code inserts html at the top of the page that looks like this:
    	//
    	// <div id="overlay">
    	//		<a href="#" onclick="hideLightbox(); return false;"><img id="loadingImage" /></a>
    	//	</div>
    	// <div id="lightbox">
    	//		<a href="#" onclick="hideLightbox(); return false;" title="Click anywhere to close image">
    	//			<img id="closeButton" />		
    	//			<img id="lightboxImage" />
    	//		</a>
    	//		<div id="lightboxDetails">
    	//			<div id="lightboxCaption"></div>
    	//			<div id="keyboardMsg"></div>
    	//		</div>
    	// </div>
    	
    	var objBody = document.getElementsByTagName("body").item(0);
    	
    	// create overlay div and hardcode some functional styles (aesthetic styles are in CSS file)
    	var objOverlay = document.createElement("div");
    	objOverlay.setAttribute('id','overlay');
    	objOverlay.onclick = function () {hideLightbox(); return false;}
    	objOverlay.style.display = 'none';
    	objOverlay.style.position = 'absolute';
    	objOverlay.style.top = '0';
    	objOverlay.style.left = '0';
    	objOverlay.style.zIndex = '90';
     	objOverlay.style.width = '100%';
    	objBody.insertBefore(objOverlay, objBody.firstChild);
    	
    	var arrayPageSize = getPageSize();
    	var arrayPageScroll = getPageScroll();
    
    	// preload and create loader image
    	var imgPreloader = new Image();
    	
    	// if loader image found, create link to hide lightbox and create loadingimage
    	imgPreloader.onload=function()
    	{
    
    		var objLoadingImageLink = document.createElement("a");
    		objLoadingImageLink.setAttribute('href','#');
    		objLoadingImageLink.onclick = function () {hideLightbox(); return false;}
    		objOverlay.appendChild(objLoadingImageLink);
    		
    		var objLoadingImage = document.createElement("img");
    		objLoadingImage.src = loadingImage;
    		objLoadingImage.setAttribute('id','loadingImage');
    		objLoadingImage.style.position = 'absolute';
    		objLoadingImage.style.zIndex = '150';
    		objLoadingImageLink.appendChild(objLoadingImage);
    
    		imgPreloader.onload=function(){};	//	clear onLoad, as IE will flip out w/animated gifs
    
    		return false;
    	}
    
    	imgPreloader.src = loadingImage;
    
    	// create lightbox div, same note about styles as above
    	var objLightbox = document.createElement("div");
    	objLightbox.setAttribute('id','lightbox');
    	objLightbox.style.display = 'none';
    	objLightbox.style.position = 'absolute';
    	objLightbox.style.zIndex = '100';	
    	objBody.insertBefore(objLightbox, objOverlay.nextSibling);
    	
    	// create link
    	var objLink = document.createElement("a");
    	objLink.setAttribute('href','#');
    	objLink.setAttribute('title','Click para cerrar');
    	objLink.onclick = function () {hideLightbox(); return false;}
    	objLightbox.appendChild(objLink);
    
    	// preload and create close button image
    	var imgPreloadCloseButton = new Image();
    
    	// if close button image found, 
    	imgPreloadCloseButton.onload=function()
    	{
    
    		var objCloseButton = document.createElement("img");
    		objCloseButton.src = closeButton;
    		objCloseButton.setAttribute('id','closeButton');
    		objCloseButton.style.position = 'absolute';
    		objCloseButton.style.zIndex = '200';
    		objLink.appendChild(objCloseButton);
    
    		return false;
    	}
    
    	imgPreloadCloseButton.src = closeButton;
    
    	// create image
    	var objImage = document.createElement("img");
    	objImage.setAttribute('id','lightboxImage');
    	objLink.appendChild(objImage);
    	
    	// create details div, a container for the caption and keyboard message
    	var objLightboxDetails = document.createElement("div");
    	objLightboxDetails.setAttribute('id','lightboxDetails');
    	objLightbox.appendChild(objLightboxDetails);
    
    	// create caption
    	var objCaption = document.createElement("div");
    	objCaption.setAttribute('id','lightboxCaption');
    	objCaption.style.display = 'none';
    	objLightboxDetails.appendChild(objCaption);
    
    	// create keyboard message
    	var objKeyboardMsg = document.createElement("div");
    	objKeyboardMsg.setAttribute('id','keyboardMsg');
    	objKeyboardMsg.innerHTML = '<kbd>x</kbd> para cerrar';
    	objLightboxDetails.appendChild(objKeyboardMsg);       
    }

//
// addLoadEvent()
// Adds event to window.onload without overwriting currently assigned onload functions.
// Function found at Simon Willison's weblog - http://simon.incutio.com/
//////////////////////////////////////////////////////////////////////////////////////////////

    function addLoadEvent(func)
    {	
    	var oldonload = window.onload;
    	if (typeof window.onload != 'function'){
        	window.onload = func;
    	} else 
    	    {
    		window.onload = function()
    		{
    		oldonload();
    		func();
    		}
    	}
    }

//////////////////////////////////////////////////////////////////////////////////////////////

addLoadEvent(initLightbox);	// run initLightbox onLoad