// ----------------------------------------------------------------------------------- 
// 
//      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); }); 
if (document.getElementById('first')) { 
th.start(document.getElementById('first')); 
} 
}).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(/£/) || (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(); });