Make PlayerPacketOutEvent cancellable

Signed-off-by: TheMode <themode@outlook.fr>

src/main/java/net/minestom/server/event/player/PlayerPacketOutEvent.java

@@ -1,6 +1,7 @@
 package net.minestom.server.event.player;
 
 import net.minestom.server.entity.Player;
+import net.minestom.server.event.trait.CancellableEvent;
 import net.minestom.server.event.trait.PlayerEvent;
 import net.minestom.server.network.packet.server.ServerPacket;
 import org.jetbrains.annotations.ApiStatus;
@@ -12,10 +13,10 @@ import org.jetbrains.annotations.NotNull;
  * Currently, do not support viewable packets.
  */
 @ApiStatus.Experimental
-public class PlayerPacketOutEvent implements PlayerEvent {
-
+public class PlayerPacketOutEvent implements PlayerEvent, CancellableEvent {
     private final Player player;
     private final ServerPacket packet;
+    private boolean cancelled;
 
     public PlayerPacketOutEvent(Player player, ServerPacket packet) {
         this.player = player;
@@ -30,4 +31,14 @@ public class PlayerPacketOutEvent implements PlayerEvent {
     public @NotNull ServerPacket getPacket() {
         return packet;
     }
+
+    @Override
+    public boolean isCancelled() {
+        return cancelled;
+    }
+
+    @Override
+    public void setCancelled(boolean cancel) {
+        this.cancelled = cancel;
+    }
 }

src/main/java/net/minestom/server/network/player/PlayerSocketConnection.java

@@ -349,7 +349,9 @@ public class PlayerSocketConnection extends PlayerConnection {
         // Outgoing event
         if (player != null && outgoing.hasListener()) {
             final ServerPacket serverPacket = SendablePacket.extractServerPacket(packet);
-            outgoing.call(new PlayerPacketOutEvent(player, serverPacket));
+            PlayerPacketOutEvent event = new PlayerPacketOutEvent(player, serverPacket);
+            outgoing.call(event);
+            if (event.isCancelled()) return;
         }
         // Write packet
         if (packet instanceof ServerPacket serverPacket) {