//** Simple Controls Gallery- (c) Dynamic Drive DHTML code library: http://www.dynamicdrive.com
//** Dec 7th, 08'- Script created (Requires jquery 1.2.x)
//** February 6th, 09'- Updated to v 1.3:
       //1) Adds Description Panel to optionally show a textual description for each slide
       //2) In Auto Play mode, you can now set the number of cycles before gallery stops.
       //3) Inside oninit() and onslide(), keyword "this" now references the current gallery instance


var simpleGallery_navpanel={
       panel: {height:'43px', opacity:0.5, paddingTop:'2px', fontStyle:'bold 11px Verdana'}, //customize nav panel container
       images: [ 'left.gif', 'play.gif', 'right.gif', 'pause.gif'], //nav panel images (in that order)
       imageSpacing: {offsetTop:[-4, 0, -4], spacing:10}, //top offset of left, play, and right images, PLUS spacing between the 3 images
       slideduration: 500 //duration of slide up animation to reveal panel
}

function simpleGallery(settingarg){
       this.setting=settingarg
       settingarg=null
       var setting=this.setting
       setting.panelheight=(parseInt(setting.navpanelheight)>5)? parseInt(setting.navpanelheight) : parseInt(simpleGallery_navpanel.panel.height)
       setting.fadeduration=parseInt(setting.fadeduration)
       setting.curimage=(setting.persist)? simpleGallery.routines.getCookie("gallery-"+setting.wrapperid) : 0
       setting.curimage=setting.curimage || 0 //account for curimage being null if cookie is empty
       setting.ispaused=!setting.autoplay[0] //ispaused reflects current state of gallery, autoplay[0] indicates whether gallery is set to auto play
       setting.currentstep=0 //keep track of # of slides slideshow has gone through
       setting.totalsteps=setting.imagearray.length*setting.autoplay[2] //Total steps limit: # of images x # of user specified cycles
       setting.fglayer=0, setting.bglayer=1 //index of active and background layer (switches after each change of slide)
       setting.oninit=setting.oninit || function(){}
       setting.onslide=setting.onslide || function(){}
       var preloadimages=[], longestdesc=null //preload images
       setting.longestdesc="" //get longest description of all slides. If no desciptions defined, variable contains ""
       for (var i=0; i<setting.imagearray.length; i++){
              preloadimages[i]=new Image()
              preloadimages[i].src=setting.imagearray[i][0]
              if (setting.imagearray[i][3] && setting.imagearray[i][3].length>setting.longestdesc.length)
                     setting.longestdesc=setting.imagearray[i][3]
       }
       var slideshow=this
       jQuery(document).ready(function($){
              var setting=slideshow.setting
              setting.$wrapperdiv=$('#'+setting.wrapperid).css({position:'relative', visibility:'visible', background:'black', overflow:'hidden', width:setting.dimensions[0], height:setting.dimensions[1]}).empty() //main gallery DIV
              if (setting.$wrapperdiv.length==0){ //if no wrapper DIV found
                     alert("Error: DIV with ID \""+setting.wrapperid+"\" not found on page.")
                     return
              }
              setting.$gallerylayers=$('<div class="gallerylayer"></div><div class="gallerylayer"></div>') //two stacked DIVs to display the actual slide 
                     .css({position:'absolute', left:0, top:0})
                     .appendTo(setting.$wrapperdiv)
              setting.gallerylayers=setting.$gallerylayers.get() //cache stacked DIVs as DOM objects
              setting.navbuttons=simpleGallery.routines.addnavpanel(setting) //get 4 nav buttons DIVs as DOM objects
              if (setting.longestdesc!="") //if at least one slide contains a description (feature is enabled)
                     setting.descdiv=simpleGallery.routines.adddescpanel(setting)
              $(setting.navbuttons).filter('img.navimages').css({opacity:0.8})
                     .bind('mouseover mouseout', function(e){
                            $(this).css({opacity:(e.type=="mouseover")? 1 : 0.8})
                     })
                     .bind('click', function(e){
                            var keyword=e.target.title.toLowerCase()
                            slideshow.navigate(keyword) //assign behavior to nav images
                     })
              setting.$wrapperdiv.bind('mouseenter', function(){slideshow.showhidenavpanel('show')})
              setting.$wrapperdiv.bind('mouseleave', function(){slideshow.showhidenavpanel('hide')})
              slideshow.showslide(setting.curimage) //show initial slide
              setting.oninit.call(slideshow) //trigger oninit() event
              $(window).bind('unload', function(){ //clean up and persist
                     $(slideshow.setting.navbuttons).unbind()
                     if (slideshow.setting.persist) //remember last shown image's index
                            simpleGallery.routines.setCookie("gallery-"+setting.wrapperid, setting.curimage)
                     jQuery.each(slideshow.setting, function(k){
                            if (slideshow.setting[k] instanceof Array){
                                   for (var i=0; i<slideshow.setting[k].length; i++){
                                          if (slideshow.setting[k][i].tagName=="DIV") //catches 2 gallerylayer divs, gallerystatus div
                                                 slideshow.setting[k][i].innerHTML=null
                                          slideshow.setting[k][i]=null
                                   }
                            }
                            if (slideshow.setting[k].innerHTML) //catch gallerydesctext div
                                   slideshow.setting[k].innerHTML=null
                            slideshow.setting[k]=null
                     })
                     slideshow=slideshow.setting=null
              })
       })
}

simpleGallery.prototype={

       navigate:function(keyword){
              clearTimeout(this.setting.playtimer)
              this.setting.totalsteps=100000 //if any of the nav buttons are clicked on, set totalsteps limit to an "unreachable" number 
              if (!isNaN(parseInt(keyword))){
                     this.showslide(parseInt(keyword))
              }
              else if (/(prev)|(next)/i.test(keyword)){
                     this.showslide(keyword.toLowerCase())
              }
              else{ //if play|pause button
                     var slideshow=this
                     var $playbutton=$(this.setting.navbuttons).eq(1)
                     if (!this.setting.ispaused){ //if pause Gallery
                            this.setting.autoplay[0]=false
                            $playbutton.attr({title:'Play', src:simpleGallery_navpanel.images[1]})
                     }
                     else if (this.setting.ispaused){ //if play Gallery
                            this.setting.autoplay[0]=true
                            this.setting.playtimer=setTimeout(function(){slideshow.showslide('next')}, this.setting.autoplay[1])
                            $playbutton.attr({title:'Pause', src:simpleGallery_navpanel.images[3]})
                     }
                     slideshow.setting.ispaused=!slideshow.setting.ispaused
              }
       },

       showslide:function(keyword){
              var slideshow=this
              var setting=slideshow.setting
              var totalimages=setting.imagearray.length
              var imgindex=(keyword=="next")? (setting.curimage<totalimages-1? setting.curimage+1 : 0)
                     : (keyword=="prev")? (setting.curimage>0? setting.curimage-1 : totalimages-1)
                     : Math.min(keyword, totalimages-1)
              setting.gallerylayers[setting.bglayer].innerHTML=simpleGallery.routines.getSlideHTML(setting.imagearray[imgindex])
              setting.$gallerylayers.eq(setting.bglayer).css({zIndex:1000, opacity:0}) //background layer becomes foreground
                     .stop().css({opacity:0}).animate({opacity:1}, setting.fadeduration, function(){ //Callback function after fade animation is complete:
                            clearTimeout(setting.playtimer)
                            setting.gallerylayers[setting.bglayer].innerHTML=null  //empty bglayer (previously fglayer before setting.fglayer=setting.bglayer was set below)
                            try{
                                   setting.onslide.call(slideshow, setting.gallerylayers[setting.fglayer], setting.curimage)
                            }catch(e){
                                   alert("Simple Controls Gallery: An error has occured somwhere in your code attached to the \"onslide\" event: "+e)
                            }
                            setting.currentstep+=1
                            if (setting.autoplay[0]){
                                   if (setting.currentstep<=setting.totalsteps)
                                          setting.playtimer=setTimeout(function(){slideshow.showslide('next')}, setting.autoplay[1])
                                   else
                                          slideshow.navigate("play/pause")
                            }
                     }) //end callback function
              setting.gallerylayers[setting.fglayer].style.zIndex=999 //foreground layer becomes background
              setting.fglayer=setting.bglayer
              setting.bglayer=(setting.bglayer==0)? 1 : 0
              setting.curimage=imgindex
              setting.navbuttons[3].innerHTML=(setting.curimage+1) + '/' + setting.imagearray.length
              if (setting.imagearray[imgindex][3]){ //if this slide contains a description
                     setting.$descpanel.css({visibility:'visible'})
                     setting.descdiv.innerHTML=setting.imagearray[imgindex][3]
              }
              else if (setting.longestdesc!=""){ //if at least one slide contains a description (feature is enabled)
                     setting.descdiv.innerHTML=null
                     setting.$descpanel.css({visibility:'hidden'})

              }
       },

       showhidenavpanel:function(state){
              var setting=this.setting
              var endpoint=(state=="show")? setting.dimensions[1]-setting.panelheight : this.setting.dimensions[1]
              setting.$navpanel.stop().animate({top:endpoint}, simpleGallery_navpanel.slideduration)
              if (setting.longestdesc!="") //if at least one slide contains a description (feature is enabled)
                     this.showhidedescpanel(state)
       },

       showhidedescpanel:function(state){
              var setting=this.setting
              var endpoint=(state=="show")? 0 : -setting.descpanelheight
              setting.$descpanel.stop().animate({top:endpoint}, simpleGallery_navpanel.slideduration)
       }
}

simpleGallery.routines={

       getSlideHTML:function(imgelement){
              var layerHTML=(imgelement[1])? '<a href="'+imgelement[1]+'" target="'+imgelement[2]+'">\n' : '' //hyperlink slide?
              layerHTML+='<img src="'+imgelement[0]+'" style="border-width:0" />'
              layerHTML+=(imgelement[1])? '</a>' : ''
              return layerHTML //return HTML for this layer
       },

       addnavpanel:function(setting){
              var interfaceHTML=''
              for (var i=0; i<3; i++){
                     var imgstyle='position:relative; border:0; cursor:hand; cursor:pointer; top:'+simpleGallery_navpanel.imageSpacing.offsetTop[i]+'px; margin-right:'+(i!=2? simpleGallery_navpanel.imageSpacing.spacing+'px' : 0)
                     var title=(i==0? 'Prev' : (i==1)? (setting.ispaused? 'Play' : 'Pause') : 'Next')
                     var imagesrc=(i==1)? simpleGallery_navpanel.images[(setting.ispaused)? 1 : 3] : simpleGallery_navpanel.images[i]
                     interfaceHTML+='<img class="navimages" title="' + title + '" src="'+ imagesrc +'" style="'+imgstyle+'" /> '
              }
              interfaceHTML+='<div class="gallerystatus" style="margin-top:1px">' + (setting.curimage+1) + '/' + setting.imagearray.length + '</div>'
              setting.$navpanel=$('<div class="navpanellayer"></div>')
                     .css({position:'absolute', width:'100%', height:setting.panelheight, left:0, top:setting.dimensions[1], font:simpleGallery_navpanel.panel.fontStyle, zIndex:'1001'})
                     .appendTo(setting.$wrapperdiv)
              $('<div class="navpanelbg"></div><div class="navpanelfg"></div>') //create inner nav panel DIVs
                     .css({position:'absolute', left:0, top:0, width:'100%', height:'100%'})
                     .eq(0).css({background:'black', opacity:simpleGallery_navpanel.panel.opacity}).end() //"navpanelbg" div
                     .eq(1).css({paddingTop:simpleGallery_navpanel.panel.paddingTop, textAlign:'center', color:'white'}).html(interfaceHTML).end() //"navpanelfg" div
                     .appendTo(setting.$navpanel)
              return setting.$navpanel.find('img.navimages, div.gallerystatus').get() //return 4 nav related images and DIVs as DOM objects
       },

       adddescpanel:function(setting){
              setting.$descpanel=$('<div class="gallerydesc"><div class="gallerydescbg"></div><div class="gallerydescfg"><div class="gallerydesctext"></div></div></div>')
                     .css({position:'absolute', width:'100%', left:0, top:-1000, zIndex:'1001'})
                     .find('div').css({position:'absolute', left:0, top:0, width:'100%'})
                     .eq(0).css({background:'black', opacity:simpleGallery_navpanel.panel.opacity}).end() //"gallerydescbg" div
                     .eq(1).css({color:'white'}).end() //"gallerydescfg" div
                     .eq(2).html(setting.longestdesc).end().end()
                     .appendTo(setting.$wrapperdiv)
              var $gallerydesctext=setting.$descpanel.find('div.gallerydesctext')
              setting.descpanelheight=$gallerydesctext.outerHeight()
              setting.$descpanel.css({top:-setting.descpanelheight, height:setting.descpanelheight}).find('div').css({height:'100%'})
              return setting.$descpanel.find('div.gallerydesctext').get(0) //return gallery description DIV as a DOM object
       },

       getCookie:function(Name){ 
              var re=new RegExp(Name+"=[^;]+", "i"); //construct RE to search for target name/value pair
              if (document.cookie.match(re)) //if cookie found
                     return document.cookie.match(re)[0].split("=")[1] //return its value
              return null
       },

       setCookie:function(name, value){
              document.cookie = name+"=" + value + ";path=/"
       }
}