// 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 = '150';
         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 = '160';
      }
      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 = '170';
      }
      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 = '180';
         }
         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 = '180';
      }
      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 = '190';
         }
         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(true);
         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:'/plugins/lightbox/images/loading.gif',
//    expandimg:'/plugins/lightbox/images/expand.gif',
//    shrinkimg:'/plugins/lightbox/images/shrink.gif',
//    effectimg:'/plugins/lightbox/images/zzoop.gif',
//    effectpos:{x:-40,y:-20},
//    effectclass:'effectable',
//    closeimg:'/plugins/lightbox/images/close.gif'
// });
//});