ÿþ/*

	Authors:

	Christophe Beyls ([url=http://www.digitalia.be]http://www.digitalia.be[/url]); MIT-style license.

	Inspired by the original Lightbox v2 by Lokesh Dhakar.

	Refactored by Aaron Newton <aaron [dot] newton [at] cnet [dot] com>

	Modified by Chris Martin <chris [dot] martin [at] redantdesign [dot] com>

*/

var Lightbox = new Class({

	options: {

		resizeDuration: 400,

		resizeTransition: false,	// default transition

		initialWidth: 250,

		initialHeight: 250,

		animateCaption: true,

		showCounter: true,

		autoScanLinks: true,

		relString: 'lightbox',

		useDefaultCss: true,

		assetBaseUrl: '/_css/',

		onImageShow: Class.empty,

		onDisplay: Class.empty,

		onHide: Class.empty 

	},

 

	initialize: function(options, anchors){

		this.setOptions(options);

		if(this.options.useDefaultCss) this.addCss();

		this.anchors = anchors || [];

		if (this.options.autoScanLinks) {

			$each(document.links, function(el){

				if (el.rel && el.rel.test("^"+this.options.relString,'i')){

					this.anchors.push(el);

				}

			}, this);

		}

		$$(this.anchors).each(function(el){

			if(!el.getProperty('rel')) el.setProperty('rel', this.options.relString);

			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(){

		if($("lbOverlay")) {

			$("lbOverlay").remove();

			$("lbCenter").remove();

			$("lbBottomContainer").remove();

		}

		this.overlay = new Element('div', {'id': 'lbOverlay'}).injectInside(document.body);

		this.center = new Element('div', {'id': 'lbCenter', 'styles': {'width': this.options.initialWidth, 'height': this.options.initialHeight, 'marginLeft': -(this.options.initialWidth/2), 'display': 'none'}}).injectInside(document.body);

		this.image = new Element('div', {'id': 'lbImage'}).injectInside(this.center);

		this.prevLink = new Element('a', {'id': 'lbPrevLink', 'href': '#', 'styles': {'display': 'none'}}).injectInside(this.image);

		this.nextLink = this.prevLink.clone().setProperty('id', 'lbNextLink').injectInside(this.image);

		this.prevLink.addEvent('click', this.previous.bindWithEvent(this));

		this.nextLink.addEvent('click', this.next.bindWithEvent(this));

 

		this.bottomContainer = new Element('div', {'id': 'lbBottomContainer', 'styles': {'display': 'none'}}).injectInside(document.body);

		this.bottom = new Element('div', {'id': 'lbBottom'}).injectInside(this.bottomContainer);

		new Element('a', {'id': 'lbCloseLink', 'href': '#'}).injectInside(this.bottom).onclick = this.overlay.onclick = this.close.bind(this);

		this.caption = new Element('div', {'id': 'lbCaption'}).injectInside(this.bottom);

		this.number = new Element('div', {'id': '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(){

		if(!$('SlimboxCss')) window.addEvent('domready', function(){

			new Asset.css(this.options.assetBaseUrl + 'slimbox.css', {id: 'SlimboxCss'});

		}.bind(this));

	},

 

	click: function(link){

		if (link.rel == this.options.relString) return this.show(link.href, link.title);

 

		var j, imageNum, images = [];

		this.anchors.each(function(el){

			if (el.rel == link.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);

		this.center.setStyles({top: this.top, display: ''});

		this.fx.overlay.start(0.8);

		return this.changeImage(imageNum);

	},

 

	position: function(){

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

	},

 

	setup: function(open){

		var elements = $A(document.getElementsByTagName('object'));

		elements.extend(document.getElementsByTagName(window.ie ? 'select' : 'embed'));

		elements.each(function(el){

			if (open) el.lbBackupStyle = el.style.visibility;

			el.style.visibility = open ? 'hidden' : el.lbBackupStyle;

		});

		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(e){

		new Event(e).stop();

		return this.changeImage(this.activeImage-1);

	},

 

	next: function(e){

		new Event(e).stop();

		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.style.backgroundColor = '';

		this.bottomContainer.style.display = this.prevLink.style.display = this.nextLink.style.display = 'none';

		this.fx.image.hide();

		this.center.className = 'lbLoading';

 

		this.preload = new Image();

		this.preload.onload = this.nextEffect.bind(this);

		this.preload.src = this.images[imageNum][0];

		return false;

	},

 

	nextEffect: function(){

		switch (this.step++){

		case 1:

			this.center.className = '';

			this.image.style.backgroundImage = 'url("'+this.images[this.activeImage][0]+'")';

			this.image.style.width = this.bottom.style.width = this.preload.width+'px';

			this.image.style.height = this.prevLink.style.height = this.nextLink.style.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.src = this.images[this.activeImage-1][0];

			if (this.activeImage != (this.images.length - 1)) this.preloadNext.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.clientHeight, height: 0, marginLeft: this.center.style.marginLeft, 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.style.height = '';

				this.fx.bottom.start(0);

				break;

			}

			this.bottomContainer.style.height = '';

		case 5:

			if (this.activeImage) this.prevLink.style.display = '';

			if (this.activeImage != (this.images.length - 1)) this.nextLink.style.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.style.display = this.bottomContainer.style.display = 'none';

		this.fx.overlay.chain(this.setup.pass(false, this)).start(0);

		return false;

	}

});

Lightbox.implement(new Options);

Lightbox.implement(new Events);