// lightbox_plus.js
// == written by Takuya Otani <takuya.otani@gmail.com> ===
// == Copyright (C) 2006 SimpleBoxes/SerendipityNZ Ltd. ==
/*
        Copyright (C) 2006 Takuya Otani/SimpleBoxes - http://serennz.cool.ne.jp/sb/
        Copyright (C) 2006 SerendipityNZ - http://serennz.cool.ne.jp/snz/

        This script is licensed under the Creative Commons Attribution 2.5 License
        http://creativecommons.org/licenses/by/2.5/

        basically, do anything you want, just leave my name and link.
*/
/*
        Original script : Lightbox JS : Fullsize Image Overlays
        Copyright (C) 2005 Lokesh Dhakar - http://www.huddletogether.com
        For more information on this script, visit:
        http://huddletogether.com/projects/lightbox/
*/
// ver. 20060131 - fixed a bug to work correctly on Internet Explorer for Windows
// ver. 20060128 - implemented functionality of echoic word
// ver. 20060120 - implemented functionality of caption and close button
// === utilities ===
function addEvent(object, type, handler)
{
        if (object.addEventListener) {
                object.addEventListener(type, handler, false);
        } else if (object.attachEvent) {
                object.attachEvent(['on',type].join(''),handler);
        } else {
                object[['on',type].join('')] = handler;
        }
}
function WindowSize()
{ // window size object
        this.w = 0;
        this.h = 0;
        return this.update();
}
WindowSize.prototype.update = function()
{
        var d = document;
        this.w =
          (window.innerWidth) ? window.innerWidth
        : (d.documentElement && d.documentElement.clientWidth) ? d.documentElement.clientWidth
        : d.body.clientWidth;
        this.h =
          (window.innerHeight) ? window.innerHeight
        : (d.documentElement && d.documentElement.clientHeight) ? d.documentElement.clientHeight
        : d.body.clientHeight;
        return this;
};
function PageSize()
{ // page size object
        this.win = new WindowSize();
        this.w = 0;
        this.h = 0;
        return this.update();
}
PageSize.prototype.update = function()
{
        var d = document;
        this.w =
          (window.innerWidth && window.scrollMaxX) ? window.innerWidth + window.scrollMaxX
        : (d.body.scrollWidth > d.body.offsetWidth) ? d.body.scrollWidth
        : d.body.offsetWidt;
        this.h =
          (window.innerHeight && window.scrollMaxY) ? window.innerHeight + window.scrollMaxY
        : (d.body.scrollHeight > d.body.offsetHeight) ? d.body.scrollHeight
        : d.body.offsetHeight;
        this.win.update();
        if (this.w < this.win.w) this.w = this.win.w;
        if (this.h < this.win.h) this.h = this.win.h;
        return this;
};
function PagePos()
{ // page position object
        this.x = 0;
        this.y = 0;
        return this.update();
}
PagePos.prototype.update = function()
{
        var d = document;
        this.x =
          (window.pageXOffset) ? window.pageXOffset
        : (d.documentElement && d.documentElement.scrollLeft) ? d.documentElement.scrollLeft
        : (d.body) ? d.body.scrollLeft
        : 0;
        this.y =
          (window.pageYOffset) ? window.pageYOffset
        : (d.documentElement && d.documentElement.scrollTop) ? d.documentElement.scrollTop
        : (d.body) ? d.body.scrollTop
        : 0;
        return this;
};
function UserAgent()
{ // user agent information
        var ua = navigator.userAgent;
        this.isWinIE = this.isMacIE = false;
        this.isGecko  = ua.match(/Gecko\//);
        this.isSafari = ua.match(/AppleWebKit/);
        this.isOpera  = window.opera;
        if (document.all && !this.isGecko && !this.isSafari && !this.isOpera) {
                this.isWinIE = ua.match(/Win/);
                this.isMacIE = ua.match(/Mac/);
                this.isNewIE = (ua.match(/MSIE 5\.5/) || ua.match(/MSIE 6\.0/));
        }
        return this;
}
// === lightbox ===
function LightBox(option)
{
        var self = this;
        self._imgs = new Array();
        self._wrap = null;
        self._box  = null;
        self._open = -1;
        self._page = new PageSize();
        self._pos  = new PagePos();
        self._ua   = new UserAgent();
        self._expandable = false;
        self._expanded = false;
        self._expand = option.expandimg;
        self._shrink = option.shrinkimg;
        return self._init(option);
}
LightBox.prototype = {
        _init : function(option)
        {
                var self = this;
                var d = document;
                if (!d.getElementsByTagName) return;
                var links = d.getElementsByTagName("a");
                for (var i=0;i<links.length;i++) {
                        var anchor = links[i];
                        var num = self._imgs.length;
                        if (!anchor.getAttribute("href")
                          || anchor.getAttribute("rel") != "lightbox") continue;
                        // initialize item
                        self._imgs[num] = {src:anchor.getAttribute("href"),w:-1,h:-1,title:'',cls:anchor.className};
                        if (anchor.getAttribute("title"))
                                self._imgs[num].title = anchor.getAttribute("title");
                        else if (anchor.firstChild && anchor.firstChild.getAttribute && anchor.firstChild.getAttribute("title"))
                                self._imgs[num].title = anchor.firstChild.getAttribute("title");
                        anchor.onclick = self._genOpener(num); // set closure to onclick event
                }
                var body = d.getElementsByTagName("body")[0];
                self._wrap = self._createWrapOn(body,option.loadingimg);
                self._box  = self._createBoxOn(body,option);
                return self;
        },
        _genOpener : function(num)
        {
                var self = this;
                return function() { self._show(num); return false; }
        },
        _createWrapOn : function(obj,imagePath)
        {
                var self = this;
                if (!obj) return null;
                // create wrapper object, translucent background
                var wrap = document.createElement('div');
                wrap.id = 'overlay';
                with (wrap.style) {
                        display = 'none';
                        position = 'fixed';
                        top = '0px';
                        left = '0px';
                        zIndex = '50';
                        width = '100%';
                        height = '100%';
                }
                if (self._ua.isWinIE) wrap.style.position = 'absolute';
                addEvent(wrap,"click",function() { self._close(); });
                obj.appendChild(wrap);
                // create loading image, animated image
                var imag = new Image;
                imag.onload = function() {
                        var spin = document.createElement('img');
                        spin.id = 'loadingImage';
                        spin.src = imag.src;
                        spin.style.position = 'relative';
                        self._set_cursor(spin);
                        addEvent(spin,'click',function() { self._close(); });
                        wrap.appendChild(spin);
                        imag.onload = function(){};
                };
                if (imagePath != '') imag.src = imagePath;
                return wrap;
        },
        _createBoxOn : function(obj,option)
        {
                var self = this;
                if (!obj) return null;
                // create lightbox object, frame rectangle
                var box = document.createElement('div');
                box.id = 'lightbox';
                with (box.style) {
                        display = 'none';
                        position = 'absolute';
                        zIndex = '60';
                }
                obj.appendChild(box);
                // create image object to display a target image
                var img = document.createElement('img');
                img.id = 'lightboxImage';
                self._set_cursor(img);
                addEvent(img,'click',function(){ self._close(); });
                addEvent(img,'mouseover',function(){ self._show_action(); });
                addEvent(img,'mouseout',function(){ self._hide_action(); });
                box.appendChild(img);
                var zoom = document.createElement('img');
                zoom.id = 'actionImage';
                with (zoom.style) {
                        display = 'none';
                        position = 'absolute';
                        top = '15px';
                        left = '15px';
                        zIndex = '70';
                }
                self._set_cursor(zoom);
                zoom.src = self._expand;
                addEvent(zoom,'mouseover',function(){ self._show_action(); });
                addEvent(zoom,'click', function() { self._zoom(); });
                box.appendChild(zoom);
                addEvent(window,'resize',function(){ self._set_size(true); });
                // close button
                if (option.closeimg) {
                        var btn = document.createElement('img');
                        btn.id = 'closeButton';
                        with (btn.style) {
                                display = 'inline';
                                position = 'absolute';
                                right = '10px';
                                top = '10px';
                                zIndex = '80';
                        }
                        btn.src = option.closeimg;
                        self._set_cursor(btn);
                        addEvent(btn,'click',function(){ self._close(); });
                        box.appendChild(btn);
                }
                // caption text
                var caption = document.createElement('span');
                caption.id = 'lightboxCaption';
                with (caption.style) {
                        display = 'none';
                        position = 'absolute';
                        zIndex = '80';
                }
                box.appendChild(caption);
                // create effect image
                if (!option.effectpos) option.effectpos = {x:0,y:0};
                else {
                        if (option.effectpos.x == '') option.effectpos.x = 0;
                        if (option.effectpos.y == '') option.effectpos.y = 0;
                }
                var effect = new Image;
                effect.onload = function() {
                        var effectImg = document.createElement('img');
                        effectImg.id = 'effectImage';
                        effectImg.src = effect.src;
                        if (option.effectclass) effectImg.className = option.effectclass;
                        with (effectImg.style) {
                                position = 'absolute';
                                display = 'none';
                                left = [option.effectpos.x,'px'].join('');;
                                top = [option.effectpos.y,'px'].join('');
                                zIndex = '90';
                        }
                        self._set_cursor(effectImg);
                        addEvent(effectImg,'click',function() { effectImg.style.display = 'none'; });
                        box.appendChild(effectImg);
                };
                if (option.effectimg != '') effect.src = option.effectimg;
                return box;
        },
        _set_photo_size : function()
        {
                var self = this;
                if (self._open == -1) return;
                var imag = self._box.firstChild;
                var targ = { w:self._page.win.w - 30, h:self._page.win.h - 30 };
                var orig = { w:self._imgs[self._open].w, h:self._imgs[self._open].h };
                // shrink image with the same aspect
                var ratio = 1.0;
                if ((orig.w >= targ.w || orig.h >= targ.h) && orig.h && orig.w)
                        ratio = ((targ.w / orig.w) < (targ.h / orig.h)) ? targ.w / orig.w : targ.h / orig.h;
                imag.width  = Math.floor(orig.w * ratio);
                imag.height = Math.floor(orig.h * ratio);
                self._expandable = (ratio < 1.0) ? true : false;
                if (self._ua.isWinIE) self._box.style.display = "block";
                self._box.style.top  = [self._pos.y + (self._page.win.h - imag.height - 30) / 2,'px'].join('');
                self._box.style.left = [((self._page.win.w - imag.width - 30) / 2),'px'].join('');
                self._show_caption(true);
        },
        _set_size : function(onResize)
        {
                var self = this;
                if (self._open == -1) return;
                self._page.update();
                self._pos.update();
                var spin = self._wrap.firstChild;
                if (spin) {
                        var top = (self._page.win.h - spin.height) / 2;
                        if (self._wrap.style.position == 'absolute') top += self._pos.y;
                        spin.style.top  = [top,'px'].join('');
                        spin.style.left = [(self._page.win.w - spin.width - 30) / 2,'px'].join('');
                }
                if (self._ua.isWinIE) {
                        self._wrap.style.width  = [self._page.win.w,'px'].join('');
                        self._wrap.style.height = [self._page.h,'px'].join('');
                }
                if (onResize) self._set_photo_size();
        },
        _show_action : function()
        {
                var self = this;
                if (self._open == -1 || !self._expandable) return;
                var obj = document.getElementById('actionImage');
                if (!obj) return;
                obj.src = (self._expanded) ? self._shrink : self._expand;
                obj.style.display = 'inline';
        },
        _hide_action : function()
        {
                var self = this;
                var obj = document.getElementById('actionImage');
                if (obj) obj.style.display = 'none';
        },
        _zoom : function()
        {
                var self = this;
                if (self._expanded) {
                        self._set_photo_size();
                        self._expanded = false;
                } else if (self._open > -1) {
                        var imag = self._box.firstChild;
                        self._box.style.top  = [self._pos.y,'px'].join('');
                        self._box.style.left = '0px';
                        imag.width  = self._imgs[self._open].w;
                        imag.height = self._imgs[self._open].h;
                        self._show_caption(false);
                        self._expanded = true;
                }
                self._show_action();
        },
        _show_caption : function(enable)
        {
                var self = this;
                var caption = document.getElementById('lightboxCaption');
                if (!caption) return;
                if (caption.innerHTML.length == 0 || !enable) {
                        caption.style.display = 'none';
                } else { // now display caption
                        var imag = self._box.firstChild;
                        with (caption.style) {
                                top = [imag.height + 10,'px'].join(''); // 10 is top margin of lightbox
                                left = '0px';
                                width = [imag.width + 20,'px'].join(''); // 20 is total side margin of lightbox
                                height = '1.2em';
                                display = 'block';
                        }
                }
        },
        _show : function(num)
        {
                var self = this;
                var imag = new Image;
                if (num < 0 || num >= self._imgs.length) return;
                var loading = document.getElementById('loadingImage');
                var caption = document.getElementById('lightboxCaption');
                var effect = document.getElementById('effectImage');
                self._open = num; // set opened image number
                self._set_size(false); // calc and set wrapper size
                self._wrap.style.display = "block";
                if (loading) loading.style.display = 'inline';
                imag.onload = function() {
                        if (self._imgs[self._open].w == -1) {
                                // store original image width and height
                                self._imgs[self._open].w = imag.width;
                                self._imgs[self._open].h = imag.height;
                        }
                        if (effect) {
                                effect.style.display = (!effect.className || self._imgs[self._open].cls == effect.className)
                                        ? 'block' : 'none';
                        }
                        if (caption) caption.innerHTML = self._imgs[self._open].title;
                        self._set_photo_size(); // calc and set lightbox size
                        self._hide_action();
                        self._box.style.display = "block";
                        self._box.firstChild.src = imag.src;
                        self._box.firstChild.setAttribute('title',self._imgs[self._open].title);
                        if (loading) loading.style.display = 'none';
                };
                self._expandable = false;
                self._expanded = false;
                imag.src = self._imgs[self._open].src;
        },
        _set_cursor : function(obj)
        {
                var self = this;
                if (self._ua.isWinIE && !self._ua.isNewIE) return;
                obj.style.cursor = 'pointer';
        },
        _close : function()
        {
                var self = this;
                self._open = -1;
                self._hide_action();
                self._wrap.style.display = "none";
                self._box.style.display  = "none";
        }
};
// === main ===
addEvent(window,"load",function() {
        var lightbox = new LightBox({
                loadingimg:'lightbox/loading.gif',
                expandimg:'lightbox/expand.gif',
                shrinkimg:'lightbox/shrink.gif',
                effectimg:'lightbox/zzoop.gif',
                effectpos:{x:-40,y:-20},
                effectclass:'lightbox/effectable',
                closeimg:'lightbox/close.gif'
        });
});