<?php
/**
* LICENSE
*
* This source file is subject to the new BSD license
* It is available through the world-wide-web at this URL:
* http://www.petala-azul.com/bsd.txt
* If you did not receive a copy of the license and are unable to
* obtain it through the world-wide-web, please send an email
* to geral@petala-azul.com so we can send you a copy immediately.
*
* @package Bvb_Grid
* @author Bento Vilas Boas <geral@petala-azul.com>
* @copyright 2010 ZFDatagrid
* @license http://www.petala-azul.com/bsd.txt New BSD License
* @version $Id$
* @link http://zfdatagrid.com
*/
class Bvb_Grid_Event_Dispatcher {
/**
* List of observers
*
* @var array
*/
protected $_listeners = array();
/**
* Class Instance
*
* @var mixed
*/
protected static $_instance = null;
/**
* Protect from instantiation
*
* @return void
*/
final protected function __construct ()
{
}
/**
* Translator instante
*
* @return Zend_Translate
*/
public static function getInstance ()
{
if ( self::$_instance === null ) {
self::$_instance = new self();
}
return self::$_instance;
}
/**
* Regists a new observer
*
* @param string $event Event name
* @param calable $callback Callback to be called
*
* @return Bvb_Grid
*/
public function connect($event, $callback, $priority = 10)
{
if (!is_callable($callback)) {
throw new Bvb_Grid_Exception((string) $callback . " not callable");
}
if (!isset($this->_listeners[$event])) {
$this->_listeners[$event] = array();
}
$this->_listeners[$event][] = array('callback' => $callback, 'priority' => $priority);
return $this;
}
/**
* Returns current registered observers for one or all events
*
* @param string $event Event to return. Leave null to return all
*
* @return mixed
*/
public function getRegisteredListeners($event=null)
{
if ($event === null) {
return $this->_listeners;
}
if (isset($this->_listeners[$event])) {
return $this->_listeners[$event];
}
return null;
}
/**
*
* @param string $name Event name
* @param array $data Data to be passed to object
*
* @return void
*/
public function emit(Bvb_Grid_Event $event)
{
if (isset($this->_listeners[$event->getName()])) {
$code = $this->_listeners[$event->getName()];
$priority = array();
foreach ($code as $key => $pri) {
$priority[$key] = $pri['priority'];
}
array_multisort($priority, SORT_ASC, $code);
foreach ($code as $callback) {
call_user_func($callback['callback'], $event);
}
}
}
/**
* Protect from instantiation
*
* @return void
*/
final protected function __clone ()
{
}
}
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