<?php // $Id: document_slideshow.inc.php 12013 2007-04-13 09:52:50Z elixir_julian $
/*
==============================================================================
	Dokeos - elearning and course management software

	Copyright (c) 2004 Dokeos S.A.
	Copyright (c) 2003 Ghent University (UGent)
	Copyright (c) 2001 Universite catholique de Louvain (UCL)

	For a full list of contributors, see "credits.txt".
	The full license can be read in "license.txt".

	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.

	See the GNU General Public License for more details.

	Contact: Zhong 	poopsoft@163.com
==============================================================================
*/
/**
==============================================================================
Developped by Patrick Cool
patrick.cool@UGent.be
Ghent University
Mai 2004
http://icto.UGent.be

Please bear in mind that this is only an alpha release. 
I wrote this quite quick and didn't think too much about it in advance. 
It is not perfect at all but it is workable and usefull (I think)
Do not consider this as a powerpoint replacement, although it has
the same starting point. 

*	This is a plugin for the documents tool. It looks for .jpg, .jpeg, .gif, .png
*	files (since these are the files that can be viewed in a browser) and creates
*	a slideshow with it by allowing to go to the next/previous image.
*	You can also have a quick overview (thumbnail view) of all the images in 
*	that particular folder.
*
*	Each slideshow is folder based. Only
*	the images of the chosen folder are shown. 
*	
*	This file has two large sections.
*	1. code that belongs in document.php, but to avoid clutter I put the code here
*	(not present) 2. the function resize_image that handles the image resizing
*	
*	@author Patrick Cool, responsible author
*	@author Roan Embrechts, minor cleanup
*	@package iilearn.document
==============================================================================
*/

/*
============================================================================== 
	general code that belongs in document.php 
	   
	this code should indeed go in documents.php but since document.php is already a really ugly file with
	too much things in one file , I decided to put the code for document.php here and to include this
	file into document.php
============================================================================== 
*/ 

// resetting the images of the slideshow = destroying the slideshow
if ($_GET['action']=="exit_slideshow")
{
	$_SESSION["image_files_only"]=null;
	unset($image_files_only); 
}

// We check if there are images in this folder by searching the extensions for .jpg, .gif, .png
// grabbing the list of all the documents of this folder
//$all_files=$fileList['name'];
$array_to_search = (is_array($docs_and_folders))?$docs_and_folders:array();

if(count($array_to_search) > 0) {
	while(list ($key) = each ($array_to_search))
	{
		$all_files[] = basename($array_to_search[$key]['path']);
		//echo basename($array_to_search[$key]['path']).'<br>';
	}
}


// storing the extension of all the documents in an array 
// and checking if there is a .jpg, .jpeg, .gif or .png file
// if this is the case a slideshow can be made. 
$all_extensions=array(); 
$image_present=0;

if ( count($all_files) > 0 )
{
	foreach ($all_files as $file)
	{
		$slideshow_extension=strrchr($file,"."); 
		$slideshow_extension=strtolower($slideshow_extension); 
		$all_extensions[]=$slideshow_extension;
		if ($slideshow_extension==".jpg" OR $slideshow_extension==".jpeg" OR $slideshow_extension==".gif" or $slideshow_extension==".png")
		{
			$image_present=1;
			$image_files_only[]=$file; 
		}
	}
}

$tablename_column = $_GET['tablename_column'];
if($tablename_column==0){
	$tablename_column=1;
}
else{
	$tablename_column= intval($tablename_column)-1;
}
$tablename_direction = $_GET['tablename_direction'];

$image_files_only = sort_files($array_to_search);
$_SESSION["image_files_only"] = $image_files_only;

function sort_files($table){
	
	global $tablename_direction;
	$temp=array();
	
	foreach($table as $file_array){
		if($file_array['filetype']=='file'){
			$temp[] = array('file', $file_array['title'], $file_array['size'], $file_array['insert_date']);
		}
	}
	
	usort($temp, 'sort_table');
	if($tablename_direction == 'DESC'){
		rsort($temp);
	}
	
	$final_array=array();
	foreach($temp as $file_array){
		$final_array[] = $file_array[1];
	}
	
	return $final_array;
	
}

function sort_table($a, $b)
{
	global $tablename_column;
	if($a[$tablename_column] > $b[$tablename_column]){
		return 1;
	}
	else{
		return -1;
	}
}


 
?>