/*==================================================*
 $Id: slideshow.js,v 1.16 2003/10/14 12:39:00 pat Exp $
 Copyright 2000-2003 Patrick Fitzgerald
 http://slideshow.barelyfitz.com/
*/

function slide(src,link,text,target,attr){
this.src=src;
this.link=link;
this.text=text;
this.target=target;
this.attr=attr;
if(document.images){
this.image=new Image();
}
this.loaded=false;
this.load=function(){
if(!document.images){return;}
if(!this.loaded){
this.image.src=this.src;
this.loaded=true;
}
}
this.hotlink=function(){
var mywindow;
if(!this.link)return;
if(this.target){
if(this.attr){
mywindow=window.open(this.link,this.target,this.attr);
}else{
mywindow=window.open(this.link,this.target);
}
if(mywindow&&mywindow.focus)mywindow.focus();
}else{
location.href=this.link;
}
}
}
function slideshow(slideshowname){
this.name=slideshowname;
this.repeat=true;
this.prefetch=-1;
this.image;
this.textid;
this.textarea;
this.timeout=3000;
this.slides=new Array();
this.current=0;
this.timeoutid=0;
this.add_slide=function(slide){
var i=this.slides.length;
if(this.prefetch==-1){
slide.load();
}
this.slides[i]=slide;
}
this.play=function(timeout){
this.pause();
if(timeout){
this.timeout=timeout;
}
if(typeof this.slides[this.current].timeout!='undefined'){
timeout=this.slides[this.current].timeout;
}else{
timeout=this.timeout;
}
this.timeoutid=setTimeout(this.name+".loop()",timeout);
}
this.pause=function(){
if(this.timeoutid!=0){
clearTimeout(this.timeoutid);
this.timeoutid=0;
}
}
this.update=function(){
if(!this.valid_image()){return;}
if(typeof this.pre_update_hook=='function'){
this.pre_update_hook();
}
var slide=this.slides[this.current];
var dofilter=false;
if(this.image&&
typeof this.image.filters!='undefined'&&
typeof this.image.filters[0]!='undefined'){
dofilter=true;
}
slide.load();
if(dofilter){
if(slide.filter&&
this.image.style&&
this.image.style.filter){
this.image.style.filter=slide.filter;
}
this.image.filters[0].Apply();
}
this.image.src=slide.image.src;
if(dofilter){
this.image.filters[0].Play();
}
this.display_text();
if(typeof this.post_update_hook=='function'){
this.post_update_hook();
}
if(this.prefetch>0){
var next,prev,count;
next=this.current;
prev=this.current;
count=0;
do{
if(++next>=this.slides.length)next=0;
if(--prev<0)prev=this.slides.length-1;
this.slides[next].load();
this.slides[prev].load();
}while(++count<this.prefetch);
}
}
this.goto_slide=function(n){
if(n==-1){
n=this.slides.length-1;
}
if(n<this.slides.length&&n>=0){
this.current=n;
}
this.update();
}
this.goto_random_slide=function(include_current){
var i;
if(this.slides.length>1){
do{
i=Math.floor(Math.random()*this.slides.length);
}while(i==this.current);
this.goto_slide(i);
}
}
this.next=function(){
if(this.current<this.slides.length-1){
this.current++;
}else if(this.repeat){
this.current=0;
}
this.update();
}
this.previous=function(){
if(this.current>0){
this.current--;
}else if(this.repeat){
this.current=this.slides.length-1;
}
this.update();
}
this.shuffle=function(){
var i,i2,slides_copy,slides_randomized;
slides_copy=new Array();
for(i=0;i<this.slides.length;i++){
slides_copy[i]=this.slides[i];
}
slides_randomized=new Array();
do{
i=Math.floor(Math.random()*slides_copy.length);
slides_randomized[slides_randomized.length]=
slides_copy[i];
for(i2=i+1;i2<slides_copy.length;i2++){
slides_copy[i2-1]=slides_copy[i2];
}
slides_copy.length--;
}while(slides_copy.length);
this.slides=slides_randomized;
}
this.get_text=function(){
return(this.slides[this.current].text);
}
this.get_all_text=function(before_slide,after_slide){
all_text="";
for(i=0;i<this.slides.length;i++){
slide=this.slides[i];
if(slide.text){
all_text+=before_slide+slide.text+after_slide;
}
}
return(all_text);
}
this.display_text=function(text){
if(!text){
text=this.slides[this.current].text;
}
if(this.textarea&&typeof this.textarea.value!='undefined'){
this.textarea.value=text;
}
if(this.textid){
r=this.getElementById(this.textid);
if(!r){return false;}
if(typeof r.innerHTML=='undefined'){return false;}
r.innerHTML=text;
}
}
this.hotlink=function(){
this.slides[this.current].hotlink();
}
this.save_position=function(cookiename){
if(!cookiename){
cookiename=this.name+'_slideshow';
}
document.cookie=cookiename+'='+this.current;
}
this.restore_position=function(cookiename){
if(!cookiename){
cookiename=this.name+'_slideshow';
}
var search=cookiename+"=";
if(document.cookie.length>0){
offset=document.cookie.indexOf(search);
if(offset!=-1){
offset+=search.length;
end=document.cookie.indexOf(";",offset);
if(end==-1)end=document.cookie.length;
this.current=parseInt(unescape(document.cookie.substring(offset,end)));
}
}
}
this.noscript=function(){
$html="\n";
for(i=0;i<this.slides.length;i++){
slide=this.slides[i];
$html+='<P>';
if(slide.link){
$html+='<a href="'+slide.link+'">';
}
$html+='<img src="'+slide.src+'" ALT="slideshow image">';
if(slide.link){
$html+="<\/a>";
}
if(slide.text){
$html+="<BR>\n"+slide.text;
}
$html+="<\/P>"+"\n\n";
}
$html=$html.replace(/\&/g,"&amp;");
$html=$html.replace(/</g,"&lt;");
$html=$html.replace(/>/g,"&gt;");
return('<pre>'+$html+'</pre>');
}
this.loop=function(){
if(this.current<this.slides.length-1){
next_slide=this.slides[this.current+1];
if(next_slide.image.complete==null||next_slide.image.complete){
this.next();
}
}else{this.next();
}
this.play();
}
this.valid_image=function(){
if(!this.image)
{
return false;
}
else{
return true;
}
}
this.getElementById=function(element_id){
if(document.getElementById){
return document.getElementById(element_id);
}
else if(document.all){
return document.all[element_id];
}
else if(document.layers){
return document.layers[element_id];
}else{
return undefined;
}
}
this.set_image=function(imageobject){
if(!document.images)
return;
this.image=imageobject;
}
this.set_textarea=function(textareaobject){
this.textarea=textareaobject;
this.display_text();
}
this.set_textid=function(textidstr){
this.textid=textidstr;
this.display_text();
}
}