Subversion-Projekte lars-tiefland.php_share

<?PHP

/**

 * example that shows how to create event bubbling

 *

 * This allows you to create several levels of event handling and you

 * may post a notification to any of these levels.

 *

 * After a notification has been posted on a lower level, it will bubble

 * up through all other levels.

 *

 * @package    Event_Dispatcher

 * @subpackage Examples

 * @author     Stephan Schmidt <schst@php.net>

 */

/**

 * load Event_Dispatcher package

 */

require_once 'Event/Dispatcher.php';

/**

 * example sender class

 */

class sender

{

    var $_dispatcher = null;

    function sender(&$dispatcher)

    {

        $this->_dispatcher = &$dispatcher;

    }

    function foo($bubble = true)

    {

        $this->_dispatcher->post($this, 'onFoo', 'Some Info...', true, $bubble);

    }

}

/**

 * example observer

 */

function receiver1(&$notification)

{

    echo "receiver 1 received notification<br />\n";

}

/**

 * example observer

 */

function receiver2(&$notification)

{

    echo "receiver 2 received notification<br />\n";

}

/**

 * example observer

 */

function receiver3(&$notification)

{

    echo "receiver 3 received notification<br />\n";

}

// get the different dispatchers

$dispatcher1 = &Event_Dispatcher::getInstance();

$dispatcher2 = &Event_Dispatcher::getInstance('child');

$dispatcher3 = &Event_Dispatcher::getInstance('grandchild');

// create senders in two different levels

$sender1 = &new sender($dispatcher1);

$sender2 = &new sender($dispatcher2);

// build three levels

$dispatcher1->addNestedDispatcher($dispatcher2);

$dispatcher2->addNestedDispatcher($dispatcher3);

// add observers in level one and two

$dispatcher1->addObserver('receiver1', 'onFoo');

$dispatcher2->addObserver('receiver2', 'onFoo');

// this will bubble up from 1 to 3

echo 'sender1->foo()<br />';

$sender1->foo();

// this will not bubble up

echo '<br />';

echo 'sender1->foo(), but disable bubbling<br />';

$sender1->foo(false);

// this will bubble up from 2 to 3

echo '<br />';

echo 'sender2->foo()<br />';

$sender2->foo();

// This observer will receive the two pending notifications on level 3

echo '<br />';

echo 'dispatcher3->addObserver()<br />';

$dispatcher3->addObserver('receiver3', 'onFoo');

// remove one level

$success = $dispatcher1->removeNestedDispatcher($dispatcher2);

if ($success === true) {

    echo '<br />';

	echo 'removed nested dispatcher2 from dispatcher1<br />';

}

// this will stay in level 1

echo 'sender1->foo()<br />';

$sender1->foo();

// this will bubble up from 2-3

echo '<br />';

echo 'sender2->foo()<br />';

$sender2->foo();

?>