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



//



//	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(); });