/* Translucent slideshow
* Created: Jan 12th, 2011 by DynamicDrive.com. This notice must stay intact for usage 
* Author: Dynamic Drive at http://www.dynamicdrive.com/
* Visit http://www.dynamicdrive.com/ for full source code
*/

jQuery.noConflict()

function translideshow(options){
    var $=jQuery
    this.setting={displaymode:{type:'auto', pause:2000, cycles:2, pauseonmouseover:true}, orientation:'h', persist:true, slideduration:500} //default settings
    jQuery.extend(this.setting, options) //merge default settings with options
    var curslide=(this.setting.persist)? translideshow.routines.getCookie("slider-"+this.setting.wrapperid) : 0
    this.curslide=(curslide==null || curslide>this.setting.imagearray.length-1)? 0 : parseInt(curslide) //make sure curslide index is within bounds
    this.curstep=0
    this.zIndex=1
    this.animation_isrunning=false //variable to indicate whether an image is currently being slided in
    this.posprop=(this.setting.orientation=="h")? "left" : "top"
    options=null
    var slideshow=this, setting=this.setting, preloadimages=[], slidesHTML=''
    for (var i=0; i<setting.imagearray.length; i++){ //preload images
        preloadimages[i]=new Image()
        preloadimages[i].src=setting.imagearray[i][0]
        slidesHTML+=translideshow.routines.getSlideHTML(setting.imagearray[i], setting.dimensions[0]+'px', setting.dimensions[1]+'px', this.posprop)+'\n'
    }
    jQuery(function($){ //on document.ready
        slideshow.init($, slidesHTML)
    })
    $(window).bind('unload', function(){ //on window onload
        if (slideshow.setting.persist) //remember last shown slide's index?
            translideshow.routines.setCookie("slider-"+setting.wrapperid, slideshow.curslide)
    })
}

translideshow.prototype={

    slide:function(nextslide, dir){ //possible values for dir: "left", "right", "top", or "down"
        if (this.curslide==nextslide)
            return
        var slider=this
        var nextslide_initialpos=this.setting.dimensions[(dir=="right"||dir=="left")? 0 : 1] * ((dir=="right"||dir=="down")? -1 : 1)
        var curslide_finalpos=-nextslide_initialpos
        var posprop=this.posprop
        if (this.animation_isrunning!=null)
            this.animation_isrunning=true //indicate animation is running
        //this.$imageslides.eq(dir=="left"||dir=="top"? nextslide : this.curslide).css("zIndex", ++this.zIndex) //increase zIndex of upcoming slide so it overlaps outgoing
        this.$imageslides.eq(nextslide).css(translideshow.routines.createobj(['visibility', 'visible'], ['zIndex', ++this.zIndex], ['opacity', 0.3], [posprop, nextslide_initialpos])) //show upcoming slide
            .animate(translideshow.routines.createobj([posprop, 0]), this.setting.slideduration, function(){
                jQuery(this).css('opacity', 1)
                slider.animation_isrunning=false
            })
        //this.$imageslides.eq(this.curslide).animate(translideshow.routines.createobj([posprop, curslide_finalpos]), this.setting.slideduration, function(){jQuery(this).css("visibility", "hidden")}) //hide outgoing slide
        this.curslide=nextslide
    },

    navigate:function(keyword){ //keyword: "back" or "forth", or "integer"
        clearTimeout(this.rotatetimer)
        var dir=(keyword=="back" || parseInt(keyword)<this.curslide)? (this.setting.orientation=="h"? "right" : "down") : (this.setting.orientation=="h"? "left" : "up")
        var targetslide=(keyword=="back")? this.curslide-1 : (keyword=="forth")? this.curslide+1 : parseInt(keyword)
        targetslide=(targetslide<0)? this.$imageslides.length-1 : (targetslide>this.$imageslides.length-1)? 0 : targetslide //wrap around
        if (this.animation_isrunning==false)
            this.slide(targetslide, dir)
    },

    rotate:function(){
        var slideshow=this
        if (this.ismouseover){ //pause slideshow onmouseover
            this.rotatetimer=setTimeout(function(){slideshow.rotate()}, this.setting.displaymode.pause)
            return
        }
        var nextslide=(this.curslide<this.$imageslides.length-1)? this.curslide+1 : 0
        this.slide(nextslide, this.posprop) //go to next slide, either to the left or upwards depending on setting.orientation setting
        if (this.setting.displaymode.cycles==0 || this.curstep<this.maxsteps-1){
            this.rotatetimer=setTimeout(function(){slideshow.rotate()}, this.setting.displaymode.pause)
            this.curstep++
        }
    },

    init:function($, slidesHTML){
        var slideshow=this, setting=this.setting
        this.$wrapperdiv=$('#'+setting.wrapperid).css({position:'relative', visibility:'visible', overflow:'hidden', width:setting.dimensions[0], height:setting.dimensions[1]}) //main DIV
        if (this.$wrapperdiv.length==0){ //if no wrapper DIV found
            alert("Error: DIV with ID \""+setting.wrapperid+"\" not found on page.")
            return
        }
        this.$wrapperdiv.html(slidesHTML)
        this.$imageslides=this.$wrapperdiv.find('div.slide')
        this.$imageslides.eq(this.curslide).css(translideshow.routines.createobj([this.posprop, 0])) //set current slide's CSS position (either "left" or "top") to 0
        if (this.setting.displaymode.type=="auto"){ //auto slide mode?
            this.setting.displaymode.pause+=this.setting.slideduration
            this.maxsteps=this.setting.displaymode.cycles * this.$imageslides.length
            if (this.setting.displaymode.pauseonmouseover){
                this.$wrapperdiv.mouseenter(function(){slideshow.ismouseover=true})
                this.$wrapperdiv.mouseleave(function(){slideshow.ismouseover=false})
            }
            this.rotatetimer=setTimeout(function(){slideshow.rotate()}, this.setting.displaymode.pause)
        }
    }

}

translideshow.routines={

    getSlideHTML:function(imgref, w, h, posprop){
        var posstr=posprop+":"+((posprop=="left")? w : h)
        var layerHTML=(imgref[1])? '<a href="'+imgref[1]+'" target="'+imgref[2]+'">' : '' //hyperlink slide?
        layerHTML+='<img src="'+imgref[0]+'" style="border-width:0;" />'
        layerHTML+=(imgref[1])? '</a>' : ''
        return '<div class="slide" style="position:absolute;'+posstr+';width:'+w+';height:'+h+';text-align:center;">'
            +'<div style="width:'+w+';height:'+h+';display:table-cell;vertical-align:middle;">'
            +layerHTML
            +'</div></div>' //return HTML for this layer
    },


    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=/"
    },

    createobj:function(){
        var obj={}
        for (var i=0; i<arguments.length; i++){
            obj[arguments[i][0]]=arguments[i][1]
        }
        return obj
    }
}