[Workflow] Add PHP attributes to register listeners and guards

[lyrixx]

Q	A
Branch?	6.4
Bug fix?	no
New feature?	yes
Deprecations?	no
Tickets
License	MIT
Doc PR

---

Allow this:

diff --git a/src/EventSubscriber/TransitionEventSubscriber.php b/src/EventSubscriber/TransitionEventSubscriber.php
index 3897e54..4ea0d46 100644
--- a/src/EventSubscriber/TransitionEventSubscriber.php
+++ b/src/EventSubscriber/TransitionEventSubscriber.php
@@ -2,18 +2,19 @@
 
 namespace App\EventSubscriber;
 
-use Symfony\Component\EventDispatcher\EventSubscriberInterface;
 use Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorageInterface;
 use Symfony\Component\Security\Core\User\UserInterface;
+use Symfony\Component\Workflow\Attribute\AsTransitionListener;
 use Symfony\Component\Workflow\Event\TransitionEvent;
 
-class TransitionEventSubscriber implements EventSubscriberInterface
+class TransitionEventSubscriber
 {
     public function __construct(
         private readonly TokenStorageInterface $tokenStorage,
     ) {
     }
 
+    #[AsTransitionListener()]
     public function onWorkflowArticleTransition(TransitionEvent $event): void
     {
         $context = $event->getContext();

All theses syntax are supported:

#[AsTransitionListener()]
#[AsTransitionListener(workflow: 'my-workflow')]
#[AsTransitionListener(workflow: 'my-workflow', transition: 'some-transition')]
public function onWorkflowArticleTransition(TransitionEvent $event): void

---

Note: This is not possible to validate the workflow name,nor the transition name, because workflow can be build dynamically

[lyrixx]

@nicolas-grekas Thanks for the review. I addressed your comments

[HeahDude]

👍

[nicolas-grekas]

Thank you @lyrixx.

[HeahDude]

Suggested change

	parent::__construct($this->buildEventName('announce', 'transition', $workflow, $transition), $method, $priority, $dispatcher);
	parent::__construct(self::buildEventName('announce', 'transition', $workflow, $transition), $method, $priority, $dispatcher);

(same for other attributes)

[nicolas-grekas]

static:: then nvm, private method