<?php  
  /**************************************************************************\
  * phpGroupWare API - MenuTree                                              *
  * This file based on PHP3 TreeMenu                                         *
  * (c)1999 Bjorge Dijkstra <bjorge@gmx.net>                                 *
  * ------------------------------------------------------------------------ *
  * This is not part of phpGroupWare, but is used by phpGroupWare.           * 
  * http://www.phpgroupware.org/                                             * 
  * ------------------------------------------------------------------------ *
  * 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.                                               *
  \**************************************************************************/

  /* $Id$ */

  /*********************************************/
  /*  Settings                                 */
  /*********************************************/
  /*                                           */      
  /*  $treefile variable needs to be set in    */
  /*  main file                                */
  /*                                           */ 
  /*********************************************/

class menutree {

var $read_from_file;          // You can send the tree info from a string or file
var $root_level_value;        // This is what the top level name or image will be

	function menutree($read_from_file='T')
	{
		if($read_from_file == 'T')
		{
			settype($read_from_file,'integer');
			$read_from_file = 1;
		}
		elseif($read_from_file == 'F')
		{
			settype($read_from_file,'integer');
			$read_from_file = 0;
		}
		$this->read_from_file = $read_from_file;
	}

	function showtree($treefile, $expandlevels='', $num_menus = 50, $invisible_menus = Null)
	{
		global $phpgw_info, $phpgw, $SCRIPT_FILENAME, $REQUEST_URI;
    
		$img_expand   = $phpgw->common->image('manual','tree_expand.gif');
		$img_collapse = $phpgw->common->image('manual','tree_collapse.gif');
		$img_line     = $phpgw->common->image('manual','tree_vertline.gif');
		$img_split	   = $phpgw->common->image('manual','tree_split.gif');
		$img_end      = $phpgw->common->image('manual','tree_end.gif');
		$img_leaf     = $phpgw->common->image('manual','tree_leaf.gif');
		$img_spc      = $phpgw->common->image('manual','tree_space.gif');
    
		/*********************************************/
		/*  Read text file with tree structure       */
		/*********************************************/
    
		/*********************************************/
		/* read file to $tree array                  */
		/* tree[x][0] -> tree level                  */
		/* tree[x][1] -> item text                   */
		/* tree[x][2] -> item link                   */
		/* tree[x][3] -> link target                 */
		/* tree[x][4] -> last item in subtree        */
		/*********************************************/
  
		$maxlevel=0;
		$cnt=-1;

		if($this->read_from_file)
		{
			$fd = fopen($treefile, 'r');
			if($fd==0)
			{
				die("menutree.inc : Unable to open file ".$treefile);
			}
			while($buffer = fgets($fd, 4096))
			{
				$cnt++;
				$tree[$cnt][0]=strspn($buffer,'.');
				$tmp=rtrim(substr($buffer,$tree[$cnt][0]));
				$node=explode('|',$tmp); 
				$tree[$cnt][1]=$node[0];
				$tree[$cnt][2]=$node[1];
				$tree[$cnt][3]=$node[2];
				$tree[$cnt][4]=0;
				if($tree[$cnt][0] > $maxlevel)
				{
					$maxlevel=$tree[$cnt][0];
				}
			}
			fclose($fd);
		}
		else
		{
			$ta = explode("\n",$treefile);
			while (list($null,$buffer) = each($ta))
			{
				$cnt++;
				$tree[$cnt][0]=strspn($buffer,".");
				$tmp=rtrim(substr($buffer,$tree[$cnt][0]));
				$node=explode('|',$tmp); 
				$tree[$cnt][1]=$node[0];
				$tree[$cnt][2]=$node[1];
				$tree[$cnt][3]=$node[2];
				$tree[$cnt][4]=0;
				if($tree[$cnt][0] > $maxlevel)
				{
					$maxlevel=$tree[$cnt][0];
				}
			}
		}
		$c_tree = count($tree);
		for($i=0; $i<$c_tree; $i++)
		{
			if($i!=0)
			{
				$expand[$i]=0;
			}
			else
			{
				$expand[$i]=1;
			}
			if($tree[$i][0] <= 2)
			{
				$visible[$i]=1;
			}
			else
			{
				$visible[$i]=0;
			}
			$levels[$i]=0;
		}
  
		/*********************************************/
		/*  Get Node numbers to expand               */
		/*********************************************/
    
		if($expandlevels!='')
		{
			$explevels = explode('|',$expandlevels);
			$c_exp = count($explevels);
			for($i=0;$i<$c_exp;$i++)
			{
				$expand[$explevels[$i]]=1;
			}
		}
		else
		{
			$c_exp = 0;
		}
    
		/*********************************************/
		/*  Find last nodes of subtrees              */
		/*********************************************/
    
		$lastlevel=$maxlevel;
		for ($i=count($tree)-1; $i>=0; $i -= 1)
		{
			if($tree[$i][0] < $tree[$i+1][0])
			{
				for($j=$tree[$i][0]+1; $j <= $maxlevel; $j++)
				{
					$levels[$j]=0;
				}
			}
			if($levels[$tree[$i][0]]==0)
			{
				$levels[$tree[$i][0]]=1;
				$tree[$i][4]=1;
			}
			else
			{
				$tree[$i][4]=0;
			}
//			$lastlevel=$tree[$i][0];  
		}
    
    
		/*********************************************/
		/*  Determine visible nodes                  */
		/*********************************************/
//    $visible[0]=1;   // root is always visible
//    $visible[1]=1;   // root is always visible
//    $visible[2]=1;   // root is always visible
//    $visible[3]=1;   // root is always visible
//    $visible[4]=1;   // root is always visible
//    $visible[5]=1;   // root is always visible
//    $visible[6]=1;   // root is always visible
//    $visible[7]=1;   // root is always visible
//    $visible[8]=1;   // root is always visible
//    $visible[9]=1;   // root is always visible
//    $visible[10]=1;   // root is always visible
//    $visible[11]=1;   // root is always visible
//    $visible[12]=1;   // root is always visible
//    $visible[13]=1;   // root is always visible
//    $visible[14]=1;   // root is always visible
//    $visible[15]=1;   // root is always visible
//    $visible[16]=1;   // root is always visible
//    $visible[17]=1;   // root is always visible
//    $visible[18]=1;   // root is always visible
//    $visible[19]=1;   // root is always visible
//    $visible[20]=1;   // root is always visible
//    $visible[21]=1;   // root is always visible
//    $visible[22]=1;   // root is always visible
//    $visible[23]=1;   // root is always visible
//    $visible[24]=1;   // root is always visible
//    $visible[25]=1;   // root is always visible
//    $visible[26]=1;   // root is always visible
//    $visible[27]=1;   // root is always visible
//    $visible[28]=1;   // root is always visible
  
		for ($i=0; $i<$c_exp; $i++)
		{
			$n=$explevels[$i];
			if(($visible[$n]==1) && ($expand[$n]==1))
			{
				for($j=$n+1;$tree[$j][0]>$tree[$n][0];$j++)
				{
					if($tree[$j][0]==$tree[$n][0]+1)
					{
						$visible[$j]=1;
					}
				}
			}
		}
  
  
		/*********************************************/
		/*  Output nicely formatted tree             */
		/*********************************************/
    
//		for($i=0; $i<$maxlevel; $i++)
//		{
//			$levels[$i]=1;
//		}
  
		$maxlevel++;
    
		$cnt=0;
		for($cnt=0;$cnt<$c_tree - 1;$cnt++)
		{
			if(!$visible[$cnt])
			{
				continue;
			}
			
			/****************************************/
			/* Create expand/collapse parameters    */
			/****************************************/
			$params='p=';
			for($i=1;$i<=$c_tree;$i++)
			{
				if(($expand[$i]==1) && ($cnt!=$i) || ($expand[$i]==0 && $cnt==$i))
				{
					if($params != 'p=')
					{
						$params .= '|';
					}
					$params .= $i;
				}
			}
			if($params=='p=')
			{
				$params='';
			}

			if($params != '')
			{
				$params = '&'.$params;
			}

        /****************************************/
        /* Always display the extreme top level */
        /****************************************/
			if($cnt==0)
			{
				$str = '<table cellspacing="0" cellpadding="0" border="0" cols="'.($maxlevel+3).'" width="'.($maxlevel*16+100).'">'."\n";
				$str .= '<a href="' . $phpgw->link('/'.$phpgw_info['flags']['currentapp'].'/index.php',$params) . '" target="_parent">' . $this->root_level_value . '</a>';
				$str .= "\n".'<tr>';
				for ($k=0; $k<$maxlevel; $k++)
				{
					$str .= '<td width=16></td>';
				}
				$str .= '<td width=100></td></tr>'."\n";
			}

			/****************************************/
			/* start new row                        */
			/****************************************/      
			$str .= '<tr>';
        
			/****************************************/
			/* vertical lines from higher levels    */
			/****************************************/
			$i=0;
			while ($i<$tree[$cnt][0]-1)
			{
				if ($levels[$i]==1)
				{
					$str .= '<td><img src="' . $img_line . '" alt="|"></td>';
				}
				else
				{
					$str .= '<td><img src="' . $img_spc . '" alt=" "></td>';
				}
				$i++;
			}
        
			/****************************************/
			/* corner at end of subtree or t-split  */
			/****************************************/         
			if ($tree[$cnt][4]==1)
			{
				$str .= '<td><img src="' . $img_end . '" alt="\"></td>';
				$levels[$tree[$cnt][0]-1]=0;
			}
			else
			{
				$str .= '<td><img src="' . $img_split . '" alt="|-"></td>';
				$levels[$tree[$cnt][0]-1]=1;    
			} 
        
			/********************************************/
			/* Node (with subtree) or Leaf (no subtree) */
			/********************************************/
			if($tree[$cnt+1][0]>$tree[$cnt][0])
			{
				$src = $REQUEST_URI;
				if(strpos($src,'&p=') != 0)
				{
					$src = str_replace(substr($REQUEST_URI,strpos($src,'&p=')),'',$REQUEST_URI);
				}
//				echo 'Src = '.$src."<br>\n";
				if($expand[$cnt]==0)
				{
//					$str .= '<td><a href="'.$phpgw->link('/'.$phpgw_info['flags']['currentapp'].'/'.basename($SCRIPT_FILENAME),$params).'"><img src="'.$img_expand.'" border="no" alt="+"></a></td>';
					$str .= '<td><a href="'.$src.$params.'"><img src="'.$img_expand.'" border="no" alt="+"></a></td>';
				}
				else
				{
//					$str .= '<td><a href="'.$phpgw->link('/'.$phpgw_info['flags']['currentapp'].'/'.basename($SCRIPT_FILENAME),$params).'"><img src="'.$img_collapse.'" border="no" alt="-"></a></td>';
					$str .= '<td><a href="'.$src.$params.'"><img src="'.$img_collapse.'" border="no" alt="-"></a></td>';
				}
			}
			elseif(isset($tree[$cnt+1][0]))
			{
				/*************************/
				/* Tree Leaf             */
				/*************************/
				$str .= '<td><img src="' . $img_leaf . '" alt="o"></td>';         
			}
        
			/****************************************/
			/* output item text                     */
			/****************************************/
			if ($tree[$cnt][2]=='')
			{
				$str .= '<td colspan="'.($maxlevel-$tree[$cnt][0]).'">'.$tree[$cnt][1].'<font face="'.$phpgw_info['theme']['font'].'" size="2"></td>';
			}
			else
			{
				$str .= '<td colspan="'.($maxlevel-$tree[$cnt][0]).'"><font face="'.$phpgw_info['theme']['font'].'" size="2"><a href="'.$tree[$cnt][2].$params.'" target="'.$tree[$cnt][3].'">'.$tree[$cnt][1].'</a></td>';
			}
            
			/****************************************/
			/* end row                              */
			/****************************************/
                
			$str .= '</tr>'."\n";
		}
		$str .= '</table>'."\n";

		return $str;
  
		/***************************************************/
		/* Tree file format                                */
		/*                                                 */
		/*                                                 */
		/* The first line is always of format :            */
		/* .[rootname]                                     */
		/*                                                 */
		/* each line contains one item, the line starts    */ 
		/* with a series of dots(.). Each dot is one level */
		/* deeper. Only one level at a time once is allowed*/
		/* Next comes the come the item name, link and     */
		/* link target, seperated by a |.                  */
		/*                                                 */  
		/* example:                                        */
		/*                                                 */  
		/* .top                                            */
		/* ..category 1                                    */
		/* ...item 1.1|item11.htm|main                     */
		/* ...item 2.2|item12.htm|main                     */
		/* ..category 2|cat2overview.htm|main              */
		/* ...item 2.1|item21.htm|main                     */
		/* ...item 2.2|item22.htm|main                     */
		/* ...item 2.3|item23.htm|main                     */
		/*                                                 */  
		/***************************************************/
	}
}