// -----------------------------------------------------------------------------------



//



//	Lightbox v2.04



//	by Lokesh Dhakar - http://www.lokeshdhakar.com



//	Last Modification: 2/9/08



//



//	For more information, visit:



//	http://lokeshdhakar.com/projects/lightbox2/



//



//	Licensed under the Creative Commons Attribution 2.5 License - http://creativecommons.org/licenses/by/2.5/



//  	- Free for use in both personal and commercial projects



//		- Attribution requires leaving author name, author link, and the license info intact.



//



//  Thanks: Scott Upton(uptonic.com), Peter-Paul Koch(quirksmode.com), and Thomas Fuchs(mir.aculo.us) for ideas, libs, and snippets.



//  		Artemy Tregubenko (arty.name) for cleanup and help in updating to latest ver of proto-aculous.



//



// -----------------------------------------------------------------------------------



/*







	Table of Contents



	-----------------



	Configuration







	Lightbox Class Declaration



	- initialize()



	- updateImageList()



	- start()



	- changeImage()



	- resizeImageContainer()



	- showImage()



	- updateDetails()



	- updateNav()



	- enableKeyboardNav()



	- disableKeyboardNav()



	- keyboardAction()



	- preloadNeighborImages()



	- end()







	Function Calls



	- document.observe()







*/



// -----------------------------------------------------------------------------------







//



//  Configurationl



//



LightboxOptions = Object.extend({



	fileLoadingImage:        '/images/loading.gif',



	fileBottomNavCloseImage: '/images/closelabel.gif',







	overlayOpacity: 0.8,   // controls transparency of shadow overlay







	animate: true,         // toggles resizing animations



	resizeSpeed: 7,        // controls the speed of the image resizing animations (1=slowest and 10=fastest)







	borderSize: 10,         //if you adjust the padding in the CSS, you will need to update this variable







	// When grouping images this is used to write: Image # of #.



	// Change it for non-english localization



	labelImage: "Image",



	labelOf: "of"



}, window.LightboxOptions || {});







// -----------------------------------------------------------------------------------







var Lightbox = Class.create();







Lightbox.prototype = {



	imageArray: [],



	activeImage: undefined,







	// initialize()



	// Constructor runs on completion of the DOM loading. Calls updateImageList and then



	// the function inserts html at the bottom of the page which is used to display the shadow



	// overlay and the image container.



	//



	initialize: function() {







		this.updateImageList();







		this.keyboardAction = this.keyboardAction.bindAsEventListener(this);







		if (LightboxOptions.resizeSpeed > 10) LightboxOptions.resizeSpeed = 10;



		if (LightboxOptions.resizeSpeed < 1)  LightboxOptions.resizeSpeed = 1;







		this.resizeDuration = LightboxOptions.animate ? ((11 - LightboxOptions.resizeSpeed) * 0.15) : 0;



		this.overlayDuration = LightboxOptions.animate ? 0.2 : 0;  // shadow fade in/out duration







		// When Lightbox starts it will resize itself from 250 by 250 to the current image dimension.



		// If animations are turned off, it will be hidden as to prevent a flicker of a



		// white 250 by 250 box.



		var size = (LightboxOptions.animate ? 250 : 1) + 'px';











		// Code inserts html at the bottom of the page that looks similar to this:



		//



		//  <div id="overlay"></div>



		//  <div id="lightbox">



		//      <div id="outerImageContainer">



		//          <div id="imageContainer">



		//              <img id="lightboxImage">



		//              <div style="" id="hoverNav">



		//                  <a href="#" id="prevLink"></a>



		//                  <a href="#" id="nextLink"></a>



		//              </div>



		//              <div id="loading">



		//                  <a href="#" id="loadingLink">



		//                      <img src="images/loading.gif">



		//                  </a>



		//              </div>



		//          </div>



		//      </div>



		//      <div id="imageDataContainer">



		//          <div id="imageData">



		//              <div id="imageDetails">



		//                  <span id="caption"></span>



		//                  <span id="numberDisplay"></span>



		//              </div>



		//              <div id="bottomNav">



		//                  <a href="#" id="bottomNavClose">



		//                      <img src="images/close.gif">



		//                  </a>



		//              </div>



		//          </div>



		//      </div>



		//  </div>











		var objBody = $$('body')[0];







		objBody.appendChild(Builder.node('div',{id:'overlay'}));







		objBody.appendChild(Builder.node('div',{id:'lightbox'}, [



			Builder.node('div',{id:'outerImageContainer'},



				Builder.node('div',{id:'imageContainer'}, [



					Builder.node('img',{id:'lightboxImage'}),



					Builder.node('div',{id:'hoverNav'}, [



						Builder.node('a',{id:'prevLink', href: '#' }),



						Builder.node('a',{id:'nextLink', href: '#' })



					]),



					Builder.node('div',{id:'loading'},



						Builder.node('a',{id:'loadingLink', href: '#' },



							Builder.node('img', {src: LightboxOptions.fileLoadingImage})



						)



					)



				])



			),



			Builder.node('div', {id:'imageDataContainer'},



				Builder.node('div',{id:'imageData'}, [



					Builder.node('div',{id:'imageDetails'}, [



						Builder.node('span',{id:'caption'}),



						Builder.node('span',{id:'numberDisplay'})



					]),



					Builder.node('div',{id:'bottomNav'},



						Builder.node('a',{id:'bottomNavClose', href: '#' },



							Builder.node('img', { src: LightboxOptions.fileBottomNavCloseImage })



						)



					)



				])



			)



		]));











		$('overlay').hide().observe('click', (function() { this.end(); }).bind(this));



		$('lightbox').hide().observe('click', (function(event) { if (event.element().id == 'lightbox') this.end(); }).bind(this));



		$('outerImageContainer').setStyle({ width: size, height: size });



		$('prevLink').observe('click', (function(event) { event.stop(); this.changeImage(this.activeImage - 1); }).bindAsEventListener(this));



		$('nextLink').observe('click', (function(event) { event.stop(); this.changeImage(this.activeImage + 1); }).bindAsEventListener(this));



		$('loadingLink').observe('click', (function(event) { event.stop(); this.end(); }).bind(this));



		$('bottomNavClose').observe('click', (function(event) { event.stop(); this.end(); }).bind(this));







		var th = this;



		(function(){



			var ids =



				'overlay lightbox outerImageContainer imageContainer lightboxImage hoverNav prevLink nextLink loading loadingLink ' +



				'imageDataContainer imageData imageDetails caption numberDisplay bottomNav bottomNavClose';



			$w(ids).each(function(id){ th[id] = $(id); });



		}).defer();



	},







	//



	// updateImageList()



	// Loops through anchor tags looking for 'lightbox' references and applies onclick



	// events to appropriate links. You can rerun after dynamically adding images w/ajax.



	//



	updateImageList: function() {



		this.updateImageList = Prototype.emptyFunction;







		document.observe('click', (function(event){



			var target = event.findElement('a[rel^=lightbox]') || event.findElement('area[rel^=lightbox]');



			if (target) {



				event.stop();



				this.start(target);



			}



		}).bind(this));



	},







	//



	//  start()



	//  Display overlay and lightbox. If image is part of a set, add siblings to imageArray.



	//



	start: function(imageLink) {







		$$('select', 'object', 'embed').each(function(node){ node.style.visibility = 'hidden' });







		// stretch overlay to fill page and fade in



		var arrayPageSize = this.getPageSize();



		$('overlay').setStyle({ width: arrayPageSize[0] + 'px', height: arrayPageSize[1] + 'px' });







		new Effect.Appear(this.overlay, { duration: this.overlayDuration, from: 0.0, to: LightboxOptions.overlayOpacity });







		this.imageArray = [];



		var imageNum = 0;







		if ((imageLink.rel == 'lightbox')){



			// if image is NOT part of a set, add single image to imageArray



			this.imageArray.push([imageLink.href, imageLink.title]);



		} else {



			// if image is part of a set..



			this.imageArray =



				$$(imageLink.tagName + '[href][rel="' + imageLink.rel + '"]').



				collect(function(anchor){ return [anchor.href, anchor.title]; }).



				uniq();





			while (this.imageArray[imageNum][0] != imageLink.href) { imageNum++; }



		}







		// calculate top and left offset for the lightbox



		var arrayPageScroll = document.viewport.getScrollOffsets();



		var lightboxTop = arrayPageScroll[1] + (document.viewport.getHeight() / 10);



		var lightboxLeft = arrayPageScroll[0];



		this.lightbox.setStyle({ top: lightboxTop + 'px', left: lightboxLeft + 'px' }).show();







		this.changeImage(imageNum);



	},







	//



	//  changeImage()



	//  Hide most elements and preload image in preparation for resizing image container.



	//



	changeImage: function(imageNum) {







		this.activeImage = imageNum; // update global var







		// hide elements during transition



		if (LightboxOptions.animate) this.loading.show();



		this.lightboxImage.hide();



		this.hoverNav.hide();



		this.prevLink.hide();



		this.nextLink.hide();



		// HACK: Opera9 does not currently support scriptaculous opacity and appear fx



		this.imageDataContainer.setStyle({opacity: .0001});



		this.numberDisplay.hide();







		var imgPreloader = new Image();







		// once image is preloaded, resize image container











		imgPreloader.onload = (function(){



			this.lightboxImage.src = this.imageArray[this.activeImage][0];



			this.resizeImageContainer(imgPreloader.width, imgPreloader.height);



		}).bind(this);



		imgPreloader.src = this.imageArray[this.activeImage][0];



	},







	//



	//  resizeImageContainer()



	//



	resizeImageContainer: function(imgWidth, imgHeight) {







		// get current width and height



		var widthCurrent  = this.outerImageContainer.getWidth();



		var heightCurrent = this.outerImageContainer.getHeight();







		// get new width and height



		var widthNew  = (imgWidth  + LightboxOptions.borderSize * 2);



		var heightNew = (imgHeight + LightboxOptions.borderSize * 2);







		// scalars based on change from old to new



		var xScale = (widthNew  / widthCurrent)  * 100;



		var yScale = (heightNew / heightCurrent) * 100;







		// calculate size difference between new and old image, and resize if necessary



		var wDiff = widthCurrent - widthNew;



		var hDiff = heightCurrent - heightNew;







		if (hDiff != 0) new Effect.Scale(this.outerImageContainer, yScale, {scaleX: false, duration: this.resizeDuration, queue: 'front'});



		if (wDiff != 0) new Effect.Scale(this.outerImageContainer, xScale, {scaleY: false, duration: this.resizeDuration, delay: this.resizeDuration});







		// if new and old image are same size and no scaling transition is necessary,



		// do a quick pause to prevent image flicker.



		var timeout = 0;



		if ((hDiff == 0) && (wDiff == 0)){



			timeout = 100;



			if (Prototype.Browser.IE) timeout = 250;



		}







		(function(){



			this.prevLink.setStyle({ height: imgHeight + 'px' });



			this.nextLink.setStyle({ height: imgHeight + 'px' });



			this.imageDataContainer.setStyle({ width: widthNew + 'px' });







			this.showImage();



		}).bind(this).delay(timeout / 1000);



	},







	//



	//  showImage()



	//  Display image and begin preloading neighbors.



	//



	showImage: function(){



		this.loading.hide();



		new Effect.Appear(this.lightboxImage, {



			duration: this.resizeDuration,



			queue: 'end',



			afterFinish: (function(){ this.updateDetails(); }).bind(this)



		});



		this.preloadNeighborImages();



	},







	//



	//  updateDetails()



	//  Display caption, image number, and bottom nav.



	//



	updateDetails: function() {







		// if caption is not null



		if (this.imageArray[this.activeImage][1] != ""){



			this.caption.update(this.imageArray[this.activeImage][1]).show();



		}







		// if image is part of set display 'Image x of x'



		if (this.imageArray.length > 1){



			this.numberDisplay.update( LightboxOptions.labelImage + ' ' + (this.activeImage + 1) + ' ' + LightboxOptions.labelOf + '  ' + this.imageArray.length).show();



		}







		new Effect.Parallel(



			[



				new Effect.SlideDown(this.imageDataContainer, { sync: true, duration: this.resizeDuration, from: 0.0, to: 1.0 }),



				new Effect.Appear(this.imageDataContainer, { sync: true, duration: this.resizeDuration })



			],



			{



				duration: this.resizeDuration,



				afterFinish: (function() {



					// update overlay size and update nav



					var arrayPageSize = this.getPageSize();



					this.overlay.setStyle({ height: arrayPageSize[1] + 'px' });



					this.updateNav();



				}).bind(this)



			}



		);



	},







	//



	//  updateNav()



	//  Display appropriate previous and next hover navigation.



	//



	updateNav: function() {







		this.hoverNav.show();







		// if not first image in set, display prev image button



		if (this.activeImage > 0) this.prevLink.show();







		// if not last image in set, display next image button



		if (this.activeImage < (this.imageArray.length - 1)) this.nextLink.show();







		this.enableKeyboardNav();



	},







	//



	//  enableKeyboardNav()



	//



	enableKeyboardNav: function() {



		document.observe('keydown', this.keyboardAction);



	},







	//



	//  disableKeyboardNav()



	//



	disableKeyboardNav: function() {



		document.stopObserving('keydown', this.keyboardAction);



	},







	//



	//  keyboardAction()



	//



	keyboardAction: function(event) {



		var keycode = event.keyCode;







		var escapeKey;



		if (event.DOM_VK_ESCAPE) {  // mozilla



			escapeKey = event.DOM_VK_ESCAPE;



		} else { // ie



			escapeKey = 27;



		}







		var key = String.fromCharCode(keycode).toLowerCase();







		if (key.match(/x|o|c/) || (keycode == escapeKey)){ // close lightbox



			this.end();



		} else if ((key == 'p') || (keycode == 37)){ // display previous image



			if (this.activeImage != 0){



				this.disableKeyboardNav();



				this.changeImage(this.activeImage - 1);



			}



		} else if ((key == 'n') || (keycode == 39)){ // display next image



			if (this.activeImage != (this.imageArray.length - 1)){



				this.disableKeyboardNav();



				this.changeImage(this.activeImage + 1);



			}



		}



	},







	//



	//  preloadNeighborImages()



	//  Preload previous and next images.



	//



	preloadNeighborImages: function(){



		var preloadNextImage, preloadPrevImage;



		if (this.imageArray.length > this.activeImage + 1){



			preloadNextImage = new Image();



			preloadNextImage.src = this.imageArray[this.activeImage + 1][0];



		}



		if (this.activeImage > 0){



			preloadPrevImage = new Image();



			preloadPrevImage.src = this.imageArray[this.activeImage - 1][0];



		}







	},







	//



	//  end()



	//



	end: function() {



		this.disableKeyboardNav();



		this.lightbox.hide();



		new Effect.Fade(this.overlay, { duration: this.overlayDuration });



		$$('select', 'object', 'embed').each(function(node){ node.style.visibility = 'visible' });



	},







	//



	//  getPageSize()



	//



	getPageSize: function() {







		 var xScroll, yScroll;







		if (window.innerHeight && window.scrollMaxY) {



			xScroll = window.innerWidth + window.scrollMaxX;



			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



			if(document.documentElement.clientWidth){



				windowWidth = document.documentElement.clientWidth;



			} else {



				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 = xScroll;



		} else {



			pageWidth = windowWidth;



		}







		return [pageWidth,pageHeight];



	}



}







document.observe('dom:loaded', function () { new Lightbox(); });