// Histomobile
//
// 
//
// Histomobile
/*

    
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(); 
});