/*==================================================*
 $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
 *==================================================*/

// There are two objects defined in this file:
// "slide" - contains all the information for a single slide
// "slideshow" - consists of multiple slide objects and runs the slideshow

//==================================================
// slide object
//==================================================
function slide(src,link,text,target,attr) {
  // This is the constructor function for the slide object.
  // It is called automatically when you create a new slide object.
  // For example:
  // s = new slide();

  // Image URL
  this.src = src;

  // Link URL
  this.link = link;

  // Text to display
  this.text = text;

  // Name of the target window ("_blank")
  this.target = target;

  // Custom duration for the slide, in milliseconds.
  // This is an optional parameter.
  // this.timeout = 3000

  // Attributes for the target window:
  // width=n,height=n,resizable=yes or no,scrollbars=yes or no,
  // toolbar=yes or no,location=yes or no,directories=yes or no,
  // status=yes or no,menubar=yes or no,copyhistory=yes or no
  // Example: "width=200,height=300"
  this.attr = attr;

  // Create an image object for the slide
  if (document.images) {
	this.image = new Image();
  }

  // Flag to tell when load() has already been called
  this.loaded = false;

  //--------------------------------------------------
  this.load = function() {
	// This method loads the image for the slide

	if (!document.images) { return; }

	if (!this.loaded) {
	  this.image.src = this.src;
	  this.loaded = true;
	}
  }

  //--------------------------------------------------
  this.hotlink = function() {
	// This method jumps to the slide's link.
	// If a window was specified for the slide, then it opens a new window.

	var mywindow;

	// If this slide does not have a link, do nothing
	if (!this.link) return;

	// Open the link in a separate window?
	if (this.target) {

	  // If window attributes are specified,
	  // use them to open the new window
	  if (this.attr) {
		mywindow = window.open(this.link, this.target, this.attr);

	  } else {
		// If window attributes are not specified, do not use them
		// (this will copy the attributes from the originating window)
		mywindow = window.open(this.link, this.target);
	  }

	  // Pop the window to the front
	  if (mywindow && mywindow.focus) mywindow.focus();

	} else {
	  // Open the link in the current window
	  location.href = this.link;
	}
  }

  //--------------------------------------------------
  this.largeImage = function() {
	CaricaFoto(this.link);
	}
}


//==================================================
// slideshow object
//==================================================
function slideshow( slideshowname ) {
  // This is the constructor function for the slideshow object.
  // It is called automatically when you create a new object.
  // For example:
  // ss = new slideshow("ss");

  // Name of this object
  // (required if you want your slideshow to auto-play)
  // For example, "SLIDES1"
  this.name = slideshowname;

  // When we reach the last slide, should we loop around to start the
  // slideshow again?
  this.repeat = true;

  // Number of images to pre-fetch.
  // -1 = preload all images.
  //  0 = load each image is it is used.
  //  n = pre-fetch n images ahead of the current image.
  // I recommend preloading all images unless you have large
  // images, or a large amount of images.
  this.prefetch = -1;

  // IMAGE element on your HTML page.
  // For example, document.images.SLIDES1IMG
  this.image;

  // ID of a DIV element on your HTML page that will contain the text.
  // For example, "slides2text"
  // Note: after you set this variable, you should call
  // the update() method to update the slideshow display.
  this.textid;

  // TEXTAREA element on your HTML page.
  // For example, document.SLIDES1FORM.SLIDES1TEXT
  // This is a depracated method for displaying the text,
  // but you might want to supply it for older browsers.
  this.textarea;

  // Milliseconds to pause between slides.
  // Individual slides can override this.
  this.timeout = 3000;

  // Hook functions to be called before and after updating the slide
  // this.pre_update_hook = function() { }
  // this.post_update_hook = function() { }

  // These are private variables
  this.slides = new Array();
  this.current = 0;
  this.timeoutid = 0;

  //--------------------------------------------------
  // Public methods
  //--------------------------------------------------
  this.add_slide = function(slide) {
	// Add a slide to the slideshow.
	// For example:
	// SLIDES1.add_slide(new slide("s1.jpg", "link.html"))

	var i = this.slides.length;

	// Prefetch the slide image if necessary
	if (this.prefetch == -1) {
	  slide.load();
	}

	this.slides[i] = slide;
  }

  //--------------------------------------------------
  this.play = function(timeout) {
	// This method implements the automatically running slideshow.
	// If you specify the "timeout" argument, then a new default
	// timeout will be set for the slideshow.
	// Make sure we're not already playing
	this.pause();

	// If the timeout argument was specified (optional)
	// then make it the new default
	if (timeout) {
	  this.timeout = timeout;
	}

	// If the current slide has a custom timeout, use it;
	// otherwise use the default timeout
	if (typeof this.slides[ this.current ].timeout != 'undefined') {
	  timeout = this.slides[ this.current ].timeout;
	} else {
	  timeout = this.timeout;
	}

	// After the timeout, call this.loop()
	this.timeoutid = setTimeout( this.name + ".loop()", timeout);
  }

  //--------------------------------------------------
  this.pause = function() {
	// This method stops the slideshow if it is automatically running.

	if (this.timeoutid != 0) {

	  clearTimeout(this.timeoutid);
	  this.timeoutid = 0;

	}
  }

  //--------------------------------------------------
  this.update = function() {
	// This method updates the slideshow image on the page
	//debugger;
	// Make sure the slideshow has been initialized correctly


	if (! this.valid_image()) { return; }

	// Call the pre-update hook function if one was specified
	if (typeof this.pre_update_hook == 'function') {
	  this.pre_update_hook();
	}

	// Convenience variable for the current slide
	var slide = this.slides[ this.current ];

	// Determine if the browser supports filters
	var dofilter = false;
	if (this.image &&
		typeof this.image.filters != 'undefined' &&
		typeof this.image.filters[0] != 'undefined') {

	  dofilter = true;

	}

	// Load the slide image if necessary
	slide.load();

	// Apply the filters for the image transition
	if (dofilter) {

	  // If the user has specified a custom filter for this slide,
	  // then set it now
	  if (slide.filter &&
		  this.image.style &&
		  this.image.style.filter) {

		this.image.style.filter = slide.filter;

	  }
	  this.image.filters[0].Apply();
	}

	// Update the image.
	this.image.src = slide.image.src;

	//alert(this.image.src);
	//alert(slide.image.src);

	// Play the image transition filters
	if (dofilter) {
	  this.image.filters[0].Play();
	}

	// Update the text
	this.display_text();

	this.desc_text();

	// Call the post-update hook function if one was specified
	if (typeof this.post_update_hook == 'function') {
	  this.post_update_hook();
	}

	// Do we need to pre-fetch images?
	if (this.prefetch > 0) {

	  var next, prev, count;

	  // Pre-fetch the next slide image(s)
	  next = this.current;
	  prev = this.current;
	  count = 0;
	  do {

		// Get the next and previous slide number
		// Loop past the ends of the slideshow if necessary
		if (++next >= this.slides.length) next = 0;
		if (--prev < 0) prev = this.slides.length - 1;

		// Preload the slide image
		this.slides[next].load();
		this.slides[prev].load();

		// Keep going until we have fetched
		// the designated number of slides

	  } while (++count < this.prefetch);
	}
  }

  //--------------------------------------------------
  this.goto_slide = function(n) {
	// This method jumpts to the slide number you specify.
	// If you use slide number -1, then it jumps to the last slide.
	// You can use this to make links that go to a specific slide,
	// or to go to the beginning or end of the slideshow.
	// Examples:
	// onClick="myslides.goto_slide(0)"
	// onClick="myslides.goto_slide(-1)"
	// onClick="myslides.goto_slide(5)"

	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) {
	// Picks a random slide (other than the current slide) and
	// displays it.
	// If the include_current parameter is true,
	// then
	// See also: shuffle()

	var i;

	// Make sure there is more than one slide
	if (this.slides.length > 1) {

	  // Generate a random slide number,
	  // but make sure it is not the current slide
	  do {
		i = Math.floor(Math.random()*this.slides.length);
	  } while (i == this.current);

	  // Display the slide
	  this.goto_slide(i);
	}
  }


  //--------------------------------------------------
  this.next = function() {
	// This method advances to the next slide.


	// Increment the image number
	if (this.current < this.slides.length - 1) {
	  this.current++;
	} else if (this.repeat) {
	  this.current = 0;
	}

	this.update();
  }


  //--------------------------------------------------
  this.previous = function() {
	// This method goes to the previous slide.

	// Decrement the image number
	if (this.current > 0) {
	  this.current--;
	} else if (this.repeat) {
	  this.current = this.slides.length - 1;
	}

	this.update();
  }


  //--------------------------------------------------
  this.shuffle = function() {
	// This method randomly shuffles the order of the slides.

	var i, i2, slides_copy, slides_randomized;

	// Create a copy of the array containing the slides
	// in sequential order
	slides_copy = new Array();
	for (i = 0; i < this.slides.length; i++) {
	  slides_copy[i] = this.slides[i];
	}

	// Create a new array to contain the slides in random order
	slides_randomized = new Array();

	// To populate the new array of slides in random order,
	// loop through the existing slides, picking a random
	// slide, removing it from the ordered list and adding it to
	// the random list.

	do {

	  // Pick a random slide from those that remain
	  i = Math.floor(Math.random()*slides_copy.length);

	  // Add the slide to the end of the randomized array
	  slides_randomized[ slides_randomized.length ] =
		slides_copy[i];

	  // Remove the slide from the sequential array,
	  // so it cannot be chosen again
	  for (i2 = i + 1; i2 < slides_copy.length; i2++) {
		slides_copy[i2 - 1] = slides_copy[i2];
	  }
	  slides_copy.length--;

	  // Keep going until we have removed all the slides

	} while (slides_copy.length);

	// Now set the slides to the randomized array
	this.slides = slides_randomized;
  }


  //--------------------------------------------------
  this.get_text = function() {
	// This method returns the text of the current slide

	return(this.slides[ this.current ].text);
  }


  //--------------------------------------------------
  this.get_all_text = function(before_slide, after_slide) {
	// Return the text for all of the slides.
	// For the text of each slide, add "before_slide" in front of the
	// text, and "after_slide" after the text.
	// For example:
	// document.write("<ul>");
	// document.write(s.get_all_text("<li>","\n"));
	// document.write("<\/ul>");

	all_text = "";

	// Loop through all the slides in the slideshow
	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) {
	// Display the text for the current slide

	// If the "text" arg was not supplied (usually it isn't),
	// get the text from the slideshow
	if (!text) {
	  text = this.slides[ this.current ].text;
	}

	// If a textarea has been specified,
	// then change the text displayed in it
	if (this.textarea && typeof this.textarea.value != 'undefined') {
	  this.textarea.value = text;
	}

	// If a text id has been specified,
	// then change the contents of the HTML element
	if (this.textid) {

	  r = this.getElementById(this.textid);
	  if (!r) { return false; }
	  if (typeof r.innerHTML == 'undefined') { return false; }

	  // Update the text
	  r.innerHTML = text;
	}
  }



  this.desc_text = function(text) {
	//alert(this.slides[ this.current ].text);
	//Forte Function
	if (document.getElementById('featuredText')) {
	document.getElementById('featuredText').innerHTML = this.slides[ this.current ].text;
	}
  }


  //--------------------------------------------------
  this.hotlink = function() {
	// This method calls the hotlink() method for the current slide.

	this.slides[ this.current ].hotlink();
  }

  this.largeImage = function() {

	this.slides[ this.current ].largeImage();
  }



  //--------------------------------------------------
  this.save_position = function(cookiename) {
	// Saves the position of the slideshow in a cookie,
	// so when you return to this page, the position in the slideshow
	// won't be lost.

	if (!cookiename) {
	  cookiename = this.name + '_slideshow';
	}

	document.cookie = cookiename + '=' + this.current;
  }


  //--------------------------------------------------
  this.restore_position = function(cookiename) {
  // If you previously called slideshow_save_position(),
  // returns the slideshow to the previous state.

	//Get cookie code by Shelley Powers

	if (!cookiename) {
	  cookiename = this.name + '_slideshow';
	}

	var search = cookiename + "=";

	if (document.cookie.length > 0) {
	  offset = document.cookie.indexOf(search);
	  // if cookie exists
	  if (offset != -1) {
		offset += search.length;
		// set index of beginning of value
		end = document.cookie.indexOf(";", offset);
		// set index of end of cookie value
		if (end == -1) end = document.cookie.length;
		this.current = parseInt(unescape(document.cookie.substring(offset, end)));
		}
	 }
  }


  //--------------------------------------------------
  this.noscript = function() {
	// This method is not for use as part of your slideshow,
	// but you can call it to get a plain HTML version of the slideshow
	// images and text.
	// You should copy the HTML and put it within a NOSCRIPT element, to
	// give non-javascript browsers access to your slideshow information.
	// This also ensures that your slideshow text and images are indexed
	// by search engines.

	$html = "\n";

	// Loop through all the slides in the slideshow
	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";
	}

	// Make the HTML browser-safe
	$html = $html.replace(/\&/g, "&amp;" );
	$html = $html.replace(/</g, "&lt;" );
	$html = $html.replace(/>/g, "&gt;" );

	return('<pre>' + $html + '</pre>');
  }


  //==================================================
  // Private methods
  //==================================================

  //--------------------------------------------------
  this.loop = function() {
	// This method is for internal use only.
	// This method gets called automatically by a JavaScript timeout.
	// It advances to the next slide, then sets the next timeout.
	// If the next slide image has not completed loading yet,
	// then do not advance to the next slide yet.

	// Make sure the next slide image has finished loading
	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();
	}

	// Keep playing the slideshow
	this.play( );
  }


  //--------------------------------------------------
  this.valid_image = function() {
	// Returns 1 if a valid image has been set for the slideshow

	if (!this.image)
	{
	  return false;
	}
	else {
	  return true;
	}
  }

  //--------------------------------------------------
  this.getElementById = function(element_id) {
	// This method returns the element corresponding to the 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;
	}
  }


  //==================================================
  // Deprecated methods
  // I don't recommend the use of the following methods,
  // but they are included for backward compatibility.
  // You can delete them if you don't need them.
  //==================================================

  //--------------------------------------------------
  this.set_image = function(imageobject) {
	// This method is deprecated; you should use
	// the following code instead:
	// s.image = document.images.myimagename;
	// s.update();

	if (!document.images)
	  return;
	this.image = imageobject;
  }

  //--------------------------------------------------
  this.set_textarea = function(textareaobject) {
	// This method is deprecated; you should use
	// the following code instead:
	// s.textarea = document.form.textareaname;
	// s.update();

	this.textarea = textareaobject;
	this.display_text();
  }

  //--------------------------------------------------
  this.set_textid = function(textidstr) {
	// This method is deprecated; you should use
	// the following code instead:
	// s.textid = "mytextid";
	// s.update();

	this.textid = textidstr;
	this.display_text();
  }
}