/*	Script: slimbox.js
		A lightbox clone for Mootools.
		
		Authors:
		Christophe Beyls (http://www.digitalia.be); MIT-style license.
		Inspired by the original Lightbox v2 by Lokesh Dhakar.
		Refactored by Aaron Newton <aaron [dot] newton [at] cnet [dot] com>
		
		Class: Lightbox
		A lightbox for displaying images in an overlay.
		
		Arguments:
		options - (object) a set of key/value options
		anchors - (array; optional) a group of anchors to which to add lightbox functionality.
		
		Options:
		resizeDuration - (integer) duration in milliseconds for the resize effect (defaults to 400)
		resizeTransition - optional <Fx.Transitions> transition reference
		initialWidth - (integer) the initial width of the box - defaults to 250
		initialHeight - (integer) the height width of the box - defaults to 250
		zIndex - (integer) zindex for the overlay (defaults to 10);
		overlayStyles - (object) styles object to pass to <Element.setStyle> for the modal layer (so you can set it to be whatever color or opacity you like). Note that the default styles are located in the (external) css file.
		animateCaption - (boolean) slide the caption in smoothly (defaults to true)
		showCounter - (boolean) shows the number of images in the set (defaults to true)
		autoScanLinks - (boolean) scan the document for anchor tags with rel tags == the relString option
		relString - (string) the string value for the "rel" tag that will make the link use the lightbox 
		                     (defaults to "lightbox"; unused if the anchors argument is specified)
	  useDefaultCss - (boolean) injects the default css for the lightbox; defauls to true
		assetBaseUrl - (string) the url where the css and image assets are (a directory); defaults to
		                     "http://www.cnet.com/html/rb/assets/global/slimbox/"
		onImageShow - (function) optional callback fired when an image is displayed
		onDisplay - (function) optional callback fired when the lightbox first shows up (onImageShow 
													 is fired just after this for the first image displayed)
		onHide - (function) optional callback fired when the lightbox is closed.
		
Examples:
(start code)
new Lightbox(); //defaults; scans the document for rel="lightbox...
new Lightbox({
	autoScanLinks: false
}, $$('a.lightbox')); //use all anchor tags with class "lightbox" instead
(end)

		Note:
		A new Lightbox is created on domReady, so it is not required that you write any javascript at all.
		All you must do is add rel="lightbox" to your images (and rel="lightbox[setName]" for sets). If you want
		to create a Lightbox on the fly or with some other set of images, you can do that whenever you like.
*/
var Lightbox = new Class({
	options: {
		resizeDuration: 400,
		resizeTransition: false,	// default transition
		initialWidth: 250,
		initialHeight: 250,
		zIndex: 10,
		animateCaption: true,
		showCounter: true,
		autoScanLinks: true,
		relString: 'lightbox',
		useDefaultCss: true,
		assetBaseUrl: 'http://www.cnet.com/html/rb/assets/global/slimbox/',
		onImageShow: Class.empty,
		onDisplay: Class.empty,
		onHide: Class.empty,
		overlayStyles: {}
	},

	initialize: function(options, anchors){
		this.setOptions(options);
		if(this.options.useDefaultCss) this.addCss();
		this.anchors = anchors || [];
		if (this.options.autoScanLinks) {
			$$('a').each(function(el){
				if (el.getProperty('rel') && el.getProperty('rel').test("^"+this.options.relString,'i')){
					if(!el.getProperty('lightboxed')) this.anchors.push(el);
				}
			}, this);
		}
		if(!$$(this.anchors).length) return; //no links!
		$$(this.anchors).each(function(el){
			if(!el.getProperty('lightboxed')) {
				el.setProperty('lightboxed', true);
				el.addEvent('click', function(e){
					new Event(e).stop();
					this.click(el);
				}.bind(this));
			}
		}.bind(this));
		this.eventKeyDown = this.keyboardListener.bindAsEventListener(this);
		this.eventPosition = this.position.bind(this);
		window.addEvent('domready', this.addHtmlElements.bind(this));
	},

	addHtmlElements: function(){
		this.overlay = new Element('div', {
			'class': 'lbOverlay',
			styles: {
				'z-index':this.options.zIndex
			}
		}).injectInside(document.body).setStyles(this.options.overlayStyles);
		this.center = new Element('div', {
			styles: {	
				width: this.options.initialWidth+'px', 
				height: this.options.initialHeight+'px', 
				'margin-left': (-(this.options.initialWidth/2))+'px', 'display': 'none',
				'z-index':this.options.zIndex+1
			}
		}).injectInside(document.body).addClass('lbCenter');
		this.image = new Element('div', {
			'class': 'lbImage'
		}).injectInside(this.center);
		this.prevLink = new Element('a', {
			'class': 'lbPrevLink', 
			styles: {
				display: 'none', 
				cursor: 'pointer'
			}
		}).injectInside(this.image);
		this.nextLink = this.prevLink.clone().removeClass('lbPrevLink').addClass('lbNextLink').injectInside(this.image);
		this.prevLink.addEvent('click', this.previous.bind(this));
		this.nextLink.addEvent('click', this.next.bind(this));

		this.bottomContainer = new Element('div', {'class': 'lbBottomContainer', 'styles': {'display': 'none', 'z-index':this.options.zIndex+1}}).injectInside(document.body);
		this.bottom = new Element('div', {'class': 'lbBottom'}).injectInside(this.bottomContainer);
		new Element('a', {'class': 'lbCloseLink', 'href': '#'}).injectInside(this.bottom).onclick = this.overlay.onclick = this.close.bind(this);
		this.caption = new Element('div', {'class': 'lbCaption'}).injectInside(this.bottom);
		this.number = new Element('div', {'class': 'lbNumber'}).injectInside(this.bottom);
		new Element('div', {'styles': {'clear': 'both'}}).injectInside(this.bottom);

		var nextEffect = this.nextEffect.bind(this);
		this.fx = {
			overlay: this.overlay.effect('opacity', {duration: 500}).hide(),
			resize: this.center.effects($extend({duration: this.options.resizeDuration, onComplete: nextEffect}, this.options.resizeTransition ? {transition: this.options.resizeTransition} : {})),
			image: this.image.effect('opacity', {duration: 500, onComplete: nextEffect}),
			bottom: this.bottom.effect('margin-top', {duration: 400, onComplete: nextEffect})
		};

		this.preloadPrev = new Image();
		this.preloadNext = new Image();
	},
	
	addCss: function(){
		window.addEvent('domready', function(){
			if(!$('SlimboxCss')) new Asset.css(this.options.assetBaseUrl + 'slimbox.css', {id: 'SlimboxCss'});
		}.bind(this));
	},

	click: function(link){
		var rel = link.getProperty('rel')||this.options.relString;
		if (rel == this.options.relString) return this.show(link.href, link.title);

		var j, imageNum, images = [];
		this.anchors.each(function(el){
			if (el.getProperty('rel') == link.getProperty('rel')){
				for (j = 0; j < images.length; j++) if(images[j][0] == el.href) break;
				if (j == images.length){
					images.push([el.href, el.title]);
					if (el.href == link.href) imageNum = j;
				}
			}
		}, this);
		return this.open(images, imageNum);
	},

	show: function(url, title){
		return this.open([[url, title]], 0);
	},

	open: function(images, imageNum){
		this.fireEvent('onDisplay');
		this.images = images;
		this.position();
		this.setup(true);
		this.top = (window.getScrollTop() + (window.getHeight() / 15)).toInt();
		this.center.setStyles({
			top: this.top+'px', 
			display: ''
		});
		this.fx.overlay.start(0.8);
		return this.changeImage(imageNum);
	},

	position: function(){
		this.overlay.setStyles({
			'top': window.getScrollTop()+'px', 
			'height': window.getHeight()+'px'
		});
	},

	setup: function(open){
		var elements = $$('object, iframe');
		elements.extend($$(window.ie ? 'select' : 'embed'));
		elements.each(function(el){
			if (open) el.lbBackupStyle = el.getStyle('visibility');
			var vis = (open ? 'hidden' : el.lbBackupStyle);
			el.setStyle('visibility', vis);
		});
		var fn = open ? 'addEvent' : 'removeEvent';
		window[fn]('scroll', this.eventPosition)[fn]('resize', this.eventPosition);
		document[fn]('keydown', this.eventKeyDown);
		this.step = 0;
	},

	keyboardListener: function(event){
		switch (event.keyCode){
			case 27: case 88: case 67: this.close(); break;
			case 37: case 80: this.previous(); break;	
			case 39: case 78: this.next();
		}
	},

	previous: function(){
		return this.changeImage(this.activeImage-1);
	},

	next: function(){
		return this.changeImage(this.activeImage+1);
	},

	changeImage: function(imageNum){
		this.fireEvent('onImageShow', imageNum);
		if (this.step || (imageNum < 0) || (imageNum >= this.images.length)) return false;
		this.step = 1;
		this.activeImage = imageNum;

		this.center.setStyle('backgroundColor', '');
		this.bottomContainer.setStyle('display', 'none');
		this.prevLink.setStyle('display', 'none');
		this.nextLink.setStyle('display', 'none');
		this.fx.image.hide();
		this.center.addClass('lbLoading');

		this.preload = new Image();
		this.preload.addEvent('load', this.nextEffect.bind(this));
		this.preload.setProperty('src', this.images[imageNum][0]);
		return false;
	},

	nextEffect: function(){
		switch (this.step++){
		case 1:
			this.image.setStyle('backgroundImage', 'url('+this.images[this.activeImage][0]+')');
			this.image.setStyle('width', this.preload.width+'px');
			this.bottom.setStyle('width',this.preload.width+'px');
			this.image.setStyle('height', this.preload.height+'px');
			this.prevLink.setStyle('height', this.preload.height+'px');
			this.nextLink.setStyle('height', this.preload.height+'px');

			this.caption.setHTML(this.images[this.activeImage][1] || '');
			this.number.setHTML((!this.options.showCounter || (this.images.length == 1)) ? '' : 'Image '+(this.activeImage+1)+' of '+this.images.length);

			if (this.activeImage) this.preloadPrev.setProperty('src', this.images[this.activeImage-1][0]);
			if (this.activeImage != (this.images.length - 1)) 
				this.preloadNext.setProperty('src',  this.images[this.activeImage+1][0]);
			if (this.center.clientHeight != this.image.offsetHeight){
				this.fx.resize.start({height: this.image.offsetHeight});
				break;
			}
			this.step++;
		case 2:
			if (this.center.clientWidth != this.image.offsetWidth){
				this.fx.resize.start({width: this.image.offsetWidth, marginLeft: -this.image.offsetWidth/2});
				break;
			}
			this.step++;
		case 3:
			this.bottomContainer.setStyles({
				top: (this.top + this.center.getSize().size.y)+'px', 
				height: '0px', 
				marginLeft: this.center.getStyle('margin-left'), 
				display: ''
			});
			this.fx.image.start(1);
			break;
		case 4:
			this.center.style.backgroundColor = '#000';
			if (this.options.animateCaption){
				this.fx.bottom.set(-this.bottom.offsetHeight);
				this.bottomContainer.setStyle('height', '');
				this.fx.bottom.start(0);
				break;
			}
			this.bottomContainer.style.height = '';
		case 5:
			if (this.activeImage) this.prevLink.setStyle('display', '');
			if (this.activeImage != (this.images.length - 1)) this.nextLink.setStyle('display', '');
			this.step = 0;
		}
	},

	close: function(){
		this.fireEvent('onHide');
		if (this.step < 0) return;
		this.step = -1;
		if (this.preload){
			this.preload.onload = Class.empty;
			this.preload = null;
		}
		for (var f in this.fx) this.fx[f].stop();
		this.center.setStyle('display', 'none');
		this.bottomContainer.setStyle('display', 'none');
		this.fx.overlay.chain(this.setup.pass(false, this)).start(0);
		return false;
	}
});
Lightbox.implement(new Options);
Lightbox.implement(new Events);
window.addEvent('domready', function(){new Lightbox()});
/* do not edit below this line */   
/* Section: Change Log 

$Source: /cvs/main/flatfile/html/rb/js/global/cnet.global.framework/common/3rdParty/Slimbox/slimbox.js,v $
$Log: slimbox.js,v $
Revision 1.10  2007/06/29 21:58:23  newtona
dangit. missing semi-colon.

Revision 1.9  2007/06/29 21:33:58  newtona
adding some docs about that style property

Revision 1.8  2007/06/29 21:32:25  newtona
more re-writes of this 3rd party script. I've tested this more thoroughly and it's stable now.
added an option to style the modal layer (overlayStyles)

Revision 1.7  2007/06/29 19:28:09  newtona
numerous fixes; mostly adding mootools standard conventions like .setStyle instead of .style.<name> =  and addEvent
changed id namespaces for dom elements to classes

Revision 1.6  2007/06/29 00:22:47  newtona
refactoring to work with Mootools 1.0 for backwards support

Revision 1.5  2007/06/18 18:42:36  newtona
the overlay div is not added to the DOM if there are no lightbox links

Revision 1.4  2007/06/17 19:57:35  newtona
fixed an issue with using the document.links collection; now uses $$('a')

Revision 1.3  2007/06/15 15:52:41  newtona
docs update

Revision 1.2  2007/06/14 01:09:33  newtona
added zindex option; fixed a bug with sets.

Revision 1.1  2007/06/07 20:22:24  newtona
*** empty log message ***


*/