/*==================================================*

 $Id: slideshow.js,v 1.16 2003/10/14 12:39:00 pat Exp $

 Copyright 2000-2003 Patrick Fitzgerald

 http://slideshow.barelyfitz.com/



 This program is free software; you can redistribute it and/or modify

 it under the terms of the GNU General Public License as published by

 the Free Software Foundation; either version 2 of the License, or

 (at your option) any later version.



 This program is distributed in the hope that it will be useful,

 but WITHOUT ANY WARRANTY; without even the implied warranty of

 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 GNU General Public License for more details.



 You should have received a copy of the GNU General Public License

 along with this program; if not, write to the Free Software

 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 *==================================================*/



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 { // we're at the last slide

      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();

  }

}