From 8318d2efb49a5b476fee2e535fa246f4b8fd690e Mon Sep 17 00:00:00 2001
From: Mergul <wismerchil@interia.eu>
Date: Sat, 10 Aug 2019 15:44:01 +0000
Subject: [PATCH] -added support for optional components in event handling

---
 source/ecs/manager.d | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/source/ecs/manager.d b/source/ecs/manager.d
index 3318d9e..b5636b3 100644
--- a/source/ecs/manager.d
+++ b/source/ecs/manager.d
@@ -330,7 +330,10 @@ export class EntityManager
                                     "optional");
                         static if (is_optional)
                         {
-                            event_field = null;
+                            if(info.deltas[EventFieldType.component_id] != 0)event_field = cast(EventFieldType*)(cast(void*) data.block
+                                    + info.deltas[EventFieldType.component_id]
+                                    + data.id * EventFieldType.sizeof);
+                            else event_field = null;
                         }
                         else
                         {