* xmlId = 'menu_tree';
* $visitor = new ezcTreeVisitorXHTML( $options );
* $tree->accept( $visitor );
* echo (string) $visitor; // print the plot
* ?>
*
*
* Shows (something like):
*
*
*
* @package Tree
* @version 1.1rc1
*/
class ezcTreeVisitorXHTML implements ezcTreeVisitor
{
/**
* Holds all the edges of the graph.
*
* @var array(string=>array(string))
*/
protected $edges = array();
/**
* Holds the root ID.
*
* @var string
*/
protected $root = null;
/**
* Whether the XML ID has been set.
*
* @var bool
*/
private $treeIdSet;
/**
* Holds the options for this class
*
* @var ezcTreeVisitorXHTMLOptions
*/
public $options;
/**
* Constructs a new ezcTreeVisitorXHTML visualizer.
*
* @param ezcTreeVisitorXHTMLOptions $options
*/
public function __construct( ezcTreeVisitorXHTMLOptions $options = null )
{
if ( $options === null )
{
$this->options = new ezcTreeVisitorXHTMLOptions;
}
else
{
$this->options = $options;
}
}
/**
* Formats a node's data.
*
* It is just a simple method, that provide an easy way to change the way
* on how data is formatted when this class is extended. The data is passed
* in the $data argument, and whether the node should be highlighted is
* passed in the $highlight argument.
*
* @param mixed $data
* @param bool $highlight
* @return string
*/
protected function formatData( $data, $highlight )
{
$data = htmlspecialchars( $data );
return $highlight ? "$data
" : $data;
}
/**
* Visits the node and sets the the member variables according to the node
* type and contents.
*
* @param ezcTreeVisitable $visitable
* @return bool
*/
public function visit( ezcTreeVisitable $visitable )
{
if ( $visitable instanceof ezcTree )
{
}
if ( $visitable instanceof ezcTreeNode )
{
if ( $this->root === null )
{
$this->root = $visitable->id;
}
$parent = $visitable->fetchParent();
if ( $parent )
{
$this->edges[$parent->id][] = array( $visitable->id, $visitable->data, $visitable->fetchPath() );
}
}
return true;
}
/**
* Loops over the children of the node with ID $id.
*
* This methods loops over all the node's children and adds the correct
* layout for each node depending on the state that is collected in the
* $level and $levelLast variables.
*
* @param string $id
* @param int $level
* @param array(int=>bool) $levelLast
*
* @return string
*/
protected function doChildren( $id, $level = 0, $levelLast = array() )
{
$text = '';
$children = $this->edges[$id];
$numChildren = count( $children );
if ( $numChildren > 0 )
{
$text .= str_repeat( ' ', $level + 1 );
$idPart = '';
if ( !$this->treeIdSet )
{
$idPart = $this->options->xmlId ? " id=\"{$this->options->xmlId}\"" : '';
$this->treeIdSet = true;
}
$text .= "\n";
foreach ( $children as $child )
{
$path = $child[2]->nodes;
if ( !$this->options->displayRootNode )
{
array_shift( $path );
}
if ( $this->options->selectedNodeLink )
{
$slice = array_slice( $path, -1 );
$path = htmlspecialchars( $this->options->basePath . '/' . array_pop( $slice ) );
}
else
{
$path = htmlspecialchars( $this->options->basePath . '/' . join( '/', $path ) );
}
$text .= str_repeat( ' ', $level + 2 );
$data = $this->formatData( $child[1], in_array( $child[0], $this->options->highlightNodeIds ) );
$linkStart = $linkEnd = '';
if ( $this->options->addLinks )
{
$linkStart = "";
$linkEnd = "";
}
$highlightPart = '';
if ( in_array( $child[0], $this->options->subtreeHighlightNodeIds ) )
{
$highlightPart = ' class="highlight"';
}
if ( isset( $this->edges[$child[0]] ) )
{
$text .= "{$linkStart}{$data}{$linkEnd}\n";
$text .= $this->doChildren( $child[0], $level + 2, $levelLast );
$text .= str_repeat( ' ', $level + 2 );
$text .= "\n";
}
else
{
$text .= "{$linkStart}{$data}{$linkEnd}\n";
}
}
$text .= str_repeat( ' ', $level + 1 );
$text .= "\n";
}
return $text;
}
/**
* Returns the XHTML representation of a tree.
*
* @return string
* @ignore
*/
public function __toString()
{
$tree = '';
$this->treeIdSet = false;
if ( $this->options->displayRootNode )
{
$idPart = $this->options->xmlId ? " id=\"{$this->options->xmlId}\"" : '';
$tree .= "\n";
$tree .= "{$this->root}\n";
$this->treeIdSet = true;
}
$tree .= $this->doChildren( $this->root );
if ( $this->options->displayRootNode )
{
$tree .= "\n";
}
return $tree;
}
}
?>