Subversion Repositories Applications.papyrus

/*
        Slimbox v1.22 - The ultimate lightweight Lightbox clone
        by Christophe Beyls (http://www.digitalia.be) - MIT-style license.
        Inspired by the original Lightbox v2 by Lokesh Dhakar.
*/

var Lightbox = {

        init: function(options) {
                this.options = Object.extend({
                        resizeDuration: 400,    // Duration of height and width resizing (ms)
                        initialWidth: 250,              // Initial width of the box (px)
                        initialHeight: 250,             // Initial height of the box (px)
                        animateCaption: true    // Enable/Disable caption animation
                }, options || {});
                
                this.anchors = [];
                $A(document.getElementsByTagName('a')).each(function(el){
                        if(el.rel && el.href && el.rel.test('^lightbox', 'i')) {
                                el.onclick = this.click.pass(el, this);
                                this.anchors.push(el);
                        }
                }, this);
                this.eventKeyDown = this.keyboardListener.bindAsEventListener(this);
                this.eventPosition = this.position.bind(this);
                
                this.overlay = new Element('div').setProperty('id', 'lbOverlay').injectInside(document.body);
                
                this.center = new Element('div').setProperty('id', 'lbCenter').setStyles({width: this.options.initialWidth+'px', height: this.options.initialHeight+'px', marginLeft: '-'+(this.options.initialWidth/2)+'px', display: 'none'}).injectInside(document.body);
                this.image = new Element('div').setProperty('id', 'lbImage').injectInside(this.center);
                this.prevLink = new Element('a').setProperties({id: 'lbPrevLink', href: '#'}).setStyle('display', 'none').injectInside(this.image);
                this.nextLink = this.prevLink.clone().setProperty('id', 'lbNextLink').injectInside(this.image);
                this.prevLink.onclick = this.previous.bind(this);
                this.nextLink.onclick = this.next.bind(this);
                
                this.bottom = new Element('div').setProperty('id', 'lbBottom').setStyle('display', 'none').injectInside(document.body);
                new Element('a').setProperties({id: 'lbCloseLink', href: '#'}).injectInside(this.bottom).onclick = this.overlay.onclick = this.close.bind(this);
                this.caption = new Element('div').setProperty('id', 'lbCaption').injectInside(this.bottom);
                this.number = new Element('div').setProperty('id', 'lbNumber').injectInside(this.bottom);
                new Element('div').setStyle('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({ duration: this.options.resizeDuration, onComplete: nextEffect }),
                        image: this.image.effect('opacity', { duration: 500, onComplete: nextEffect }),
                        bottom: this.bottom.effects({ duration: 400, onComplete: nextEffect })
                };
                
                this.preloadPrev = new Image();
                this.preloadNext = new Image();
        },

        click: function(link) {
                if(link.rel.length == 8)
                        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.images = images;
                this.position();
                this.setup(true);
                this.top = Window.getScrollTop() + (Window.getHeight() / 15);
                this.center.setStyles({top: this.top+'px', display: ''});
                this.fx.overlay.goTo(0.8);
                return this.changeImage(imageNum);
        },

        position: function() {
                this.overlay.setStyles({top: Window.getScrollTop()+'px', height: Window.getHeight()+'px'});
        },

        setup: function(open) {
                var elements = $A(document.getElementsByTagName('object'));
                elements.extend(document.getElementsByTagName(window.ActiveXObject ? 'select' : 'embed'));
                elements.each(function(el){ el.style.visibility = open ? 'hidden' : ''; });
                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() {
                return this.changeImage(this.activeImage-1);
        },

        next: function() {
                return this.changeImage(this.activeImage+1);
        },

        changeImage: function(imageNum) {               
                if(this.step || (imageNum < 0) || (imageNum >= this.images.length)) return false;
                this.step = 1;
                this.activeImage = imageNum;
                
                this.prevLink.style.display = this.nextLink.style.display = 'none';
                this.bottom.setStyles({opacity: '0', height: '0px', 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.setStyles({backgroundImage: 'url('+this.images[this.activeImage][0]+')', 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.images.length == 1) ? '' : 'Image '+(this.activeImage+1)+' of '+this.images.length);
                        
                        if(this.activeImage != 0) 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.custom({height: [this.center.clientHeight, this.image.offsetHeight]});
                                break;
                        }
                        this.step++;
                case 2:
                        if(this.center.clientWidth != this.image.offsetWidth) {
                                this.fx.resize.custom({width: [this.center.clientWidth, this.image.offsetWidth], marginLeft: [-this.center.clientWidth/2, -this.image.offsetWidth/2]});
                                break;
                        }
                        this.step++;
                case 3:
                        this.bottom.setStyles({top: (this.top + this.center.clientHeight)+'px', width: this.image.style.width, marginLeft: this.center.style.marginLeft, display: ''});
                        this.fx.image.custom(0, 1);
                        break;
                case 4:
                        if(this.options.animateCaption) {
                                this.fx.bottom.custom({opacity: [0, 1], height: [0, this.bottom.scrollHeight]});
                                break;
                        }
                        this.bottom.setStyles({opacity: '1', height: this.bottom.scrollHeight+'px'});
                case 5:
                        if(this.activeImage != 0) this.prevLink.style.display = '';
                        if(this.activeImage != (this.images.length - 1)) this.nextLink.style.display = '';
                        this.step = 0;
                }
        },

        close: function() {
                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].clearTimer();
                this.center.style.display = this.bottom.style.display = 'none';
                this.fx.overlay.chain(this.setup.pass(false, this)).goTo(0);
                return false;
        }
};

Window.onDomReady(Lightbox.init.bind(Lightbox));