// 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;
/* 
-------------------------------------------------------------------------------
06.03.18 update by drk / 自動的に a tag の jpg を発見するように変更

            if (!anchor.getAttribute("href")
              || anchor.getAttribute("rel") != "lightbox") continue;
-------------------------------------------------------------------------------
*/
            if (!anchor.getAttribute("href")) continue;
            if (!anchor.getAttribute("href").match(/.+(jpg|gif|png)$/i)) 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 = '5px';
                top = '5px';
                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.zIndex  = 100;
            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:'/css/lightbox/loading.gif',
        expandimg:'/css/lightbox/lightbox/expand.gif',
        shrinkimg:'/css/lightbox/lightbox/shrink.gif',
        effectimg:'',
        effectpos:{x:-40,y:-20},
        effectclass:'effectable',
        closeimg:'/css/lightbox/lightbox/close.gif'
    });
});