1: <?php
 2: /**
 3:  * PHP version 5
 4:  * @package    generalDriver
 5:  * @author     Christian Schiffler <c.schiffler@cyberspectrum.de>
 6:  * @author     Stefan Heimes <stefan_heimes@hotmail.com>
 7:  * @author     Tristan Lins <tristan.lins@bit3.de>
 8:  * @copyright  The MetaModels team.
 9:  * @license    LGPL.
10:  * @filesource
11:  */
12: 
13: namespace DcGeneral\Contao\Callback;
14: 
15: use DcGeneral\Contao\View\Contao2BackendView\Event\GetGroupHeaderEvent;
16: 
17: /**
18:  * Class ModelGroupCallbackListener.
19:  *
20:  * Handler for the group header callbacks of a property.
21:  *
22:  * @package DcGeneral\Contao\Callback
23:  */
24: class ModelGroupCallbackListener extends AbstractReturningCallbackListener
25: {
26:     /**
27:      * Retrieve the arguments for the callback.
28:      *
29:      * @param GetGroupHeaderEvent $event The event being emitted.
30:      *
31:      * @return array
32:      */
33:     public function getArgs($event)
34:     {
35:         return array(
36:             $event->getGroupField(),
37:             $event->getGroupingMode(),
38:             $event->getValue(),
39:             $event->getModel()->getPropertiesAsArray()
40:         );
41:     }
42: 
43:     /**
44:      * Set the value in the event.
45:      *
46:      * @param GetGroupHeaderEvent $event The event being emitted.
47:      *
48:      * @param string              $value The value returned by the callback.
49:      *
50:      * @return void
51:      */
52:     public function update($event, $value)
53:     {
54:         if (is_null($value))
55:         {
56:             return;
57:         }
58: 
59:         $event->setValue($value);
60:         $event->stopPropagation();
61:     }
62: }
63: