Merge pull request #1155 from Owain94/eventbus-double-sub

eventbus: event interface & prevent double subscribing

runelite-api/src/main/java/net/runelite/api/events/AnimationChanged.java

@@ -2,7 +2,6 @@ package net.runelite.api.events;
 
 import net.runelite.api.Actor;
 import lombok.Data;
-import net.runelite.api.Actor;
 
 /**
  * An event where the {@link Actor} has changed animations.
@@ -18,7 +17,7 @@ import net.runelite.api.Actor;
  * @see net.runelite.api.AnimationID
  */
 @Data
-public class AnimationChanged
+public class AnimationChanged implements Event
 {
 	/**
 	 * The actor that has entered a new animation.

runelite-api/src/main/java/net/runelite/api/events/AreaSoundEffectPlayed.java

@@ -27,7 +27,7 @@ package net.runelite.api.events;
 import lombok.Data;
 
 @Data
-public class AreaSoundEffectPlayed
+public class AreaSoundEffectPlayed implements Event
 {
 	private int soundId;
 	private int sceneX;

runelite-api/src/main/java/net/runelite/api/events/BeforeMenuRender.java

@@ -27,7 +27,7 @@ package net.runelite.api.events;
 import lombok.Data;
 
 @Data
-public class BeforeMenuRender
+public class BeforeMenuRender implements Event
 {
 	private boolean consumed;
 

runelite-api/src/main/java/net/runelite/api/events/BeforeRender.java

@@ -27,7 +27,7 @@ package net.runelite.api.events;
 /**
  * Posted at the start of every frame
  */
-public class BeforeRender
+public class BeforeRender implements Event
 {
 	public static final BeforeRender INSTANCE = new BeforeRender();
 

runelite-api/src/main/java/net/runelite/api/events/BoostedLevelChanged.java

@@ -42,7 +42,7 @@ import lombok.Data;
  * retrieve the newly boosted skill level.
  */
 @Data
-public class BoostedLevelChanged
+public class BoostedLevelChanged implements Event
 {
 	/**
 	 * The skill that has had its level modified.

runelite-api/src/main/java/net/runelite/api/events/CannonballFired.java

@@ -27,7 +27,7 @@ package net.runelite.api.events;
 /**
  * an event posted when a cannonball is fired
  */
-public class CannonballFired
+public class CannonballFired implements Event
 {
 	public static final CannonballFired INSTANCE = new CannonballFired();
 

runelite-api/src/main/java/net/runelite/api/events/CanvasSizeChanged.java

@@ -27,7 +27,7 @@ package net.runelite.api.events;
 /**
  * An event posted when the canvas size might have changed.
  */
-public class CanvasSizeChanged
+public class CanvasSizeChanged implements Event
 {
 	public static final CanvasSizeChanged INSTANCE = new CanvasSizeChanged();
 

runelite-api/src/main/java/net/runelite/api/events/ChatMessage.java

@@ -41,7 +41,7 @@ import lombok.NoArgsConstructor;
 @Data
 @AllArgsConstructor
 @NoArgsConstructor
-public class ChatMessage
+public class ChatMessage implements Event
 {
 	/**
 	 * The underlying MessageNode for the message.

runelite-api/src/main/java/net/runelite/api/events/ClanChanged.java

@@ -30,7 +30,7 @@ import lombok.Value;
  * An event where the client has joined or left a clan chat.
  */
 @Value
-public class ClanChanged
+public class ClanChanged implements Event
 {
 	/**
 	 * Whether or not the client is now in a clan chat.

runelite-api/src/main/java/net/runelite/api/events/ClanMemberJoined.java

@@ -28,7 +28,7 @@ import net.runelite.api.ClanMember;
 import lombok.Value;
 
 @Value
-public class ClanMemberJoined
+public class ClanMemberJoined implements Event
 {
 	/**
 	 * The ClanMember that joined

runelite-api/src/main/java/net/runelite/api/events/ClanMemberLeft.java

@@ -28,7 +28,7 @@ import net.runelite.api.ClanMember;
 import lombok.Value;
 
 @Value
-public class ClanMemberLeft
+public class ClanMemberLeft implements Event
 {
 	/**
 	 * The ClanMember that left

runelite-api/src/main/java/net/runelite/api/events/ClientTick.java

@@ -27,7 +27,7 @@ package net.runelite.api.events;
 /**
  * Posted every client tick
  */
-public class ClientTick
+public class ClientTick implements Event
 {
 	public static final ClientTick INSTANCE = new ClientTick();
 

runelite-api/src/main/java/net/runelite/api/events/CommandExecuted.java

@@ -42,7 +42,7 @@ import lombok.Value;
  * will set command to "" and arguments to ["hello", "world!"].
  */
 @Value
-public class CommandExecuted
+public class CommandExecuted implements Event
 {
 	/**
 	 * The name of the command entered.

runelite-api/src/main/java/net/runelite/api/events/ConfigChanged.java

@@ -30,7 +30,7 @@ import lombok.Data;
  * An event where a configuration entry has been modified.
  */
 @Data
-public class ConfigChanged
+public class ConfigChanged implements Event
 {
 	/**
 	 * The parent group for the key.

runelite-api/src/main/java/net/runelite/api/events/DecorativeObjectChanged.java

@@ -33,7 +33,7 @@ import lombok.Data;
  * has been modified.
  */
 @Data
-public class DecorativeObjectChanged
+public class DecorativeObjectChanged implements Event
 {
 	/**
 	 * The affected tile.

runelite-api/src/main/java/net/runelite/api/events/DecorativeObjectDespawned.java

@@ -33,7 +33,7 @@ import lombok.Data;
  * is removed.
  */
 @Data
-public class DecorativeObjectDespawned
+public class DecorativeObjectDespawned implements Event
 {
 	/**
 	 * The affected tile.

runelite-api/src/main/java/net/runelite/api/events/DecorativeObjectSpawned.java

@@ -32,7 +32,7 @@ import lombok.Data;
  * An event where a {@link DecorativeObject} is attached to a {@link Tile}.
  */
 @Data
-public class DecorativeObjectSpawned
+public class DecorativeObjectSpawned implements Event
 {
 	/**
 	 * The affected tile.

runelite-api/src/main/java/net/runelite/api/events/DraggingWidgetChanged.java

@@ -31,7 +31,7 @@ import lombok.Data;
  * the cursor.
  */
 @Data
-public class DraggingWidgetChanged
+public class DraggingWidgetChanged implements Event
 {
 	/**
 	 * Whether a widget is currently being dragged.

runelite-api/src/main/java/net/runelite/api/events/DynamicObjectAnimationChanged.java

@@ -3,7 +3,7 @@ package net.runelite.api.events;
 import lombok.Data;
 
 @Data
-public class DynamicObjectAnimationChanged
+public class DynamicObjectAnimationChanged implements Event
 {
 	/**
 	 * The object that has entered a new animation.

runelite-api/src/main/java/net/runelite/api/events/Event.java

@@ -0,0 +1,5 @@
+package net.runelite.api.events;
+
+public interface Event
+{
+}

runelite-api/src/main/java/net/runelite/api/events/ExperienceChanged.java

@@ -32,7 +32,7 @@ import lombok.Data;
  * An event where the experience level of a {@link Skill} has been modified.
  */
 @Data
-public class ExperienceChanged
+public class ExperienceChanged implements Event
 {
 	/**
 	 * The modified skill.

runelite-api/src/main/java/net/runelite/api/events/FocusChanged.java

@@ -37,7 +37,7 @@ import lombok.Data;
  * </ul>
  */
 @Data
-public class FocusChanged
+public class FocusChanged implements Event
 {
 	/**
 	 * The new focus state.

runelite-api/src/main/java/net/runelite/api/events/FriendAdded.java

@@ -6,7 +6,7 @@ import lombok.Value;
  * An event where a request to add a friend is sent to the server.
  */
 @Value
-public class FriendAdded
+public class FriendAdded implements Event
 {
 	/**
 	 * The name of the added friend.

runelite-api/src/main/java/net/runelite/api/events/FriendRemoved.java

@@ -30,7 +30,7 @@ import lombok.Value;
  * An event where a request to remove a friend is sent to the server.
  */
 @Value
-public class FriendRemoved
+public class FriendRemoved implements Event
 {
 	/**
 	 * The name of the removed friend.

runelite-api/src/main/java/net/runelite/api/events/GameObjectChanged.java

@@ -32,7 +32,7 @@ import net.runelite.api.Tile;
  * An event where a {@link GameObject} on a {@link Tile} has been replaced.
  */
 @Data
-public class GameObjectChanged
+public class GameObjectChanged implements Event
 {
 	/**
 	 * The affected tile.

runelite-api/src/main/java/net/runelite/api/events/GameObjectDespawned.java

@@ -32,7 +32,7 @@ import lombok.Data;
  * An event where a {@link GameObject} on a {@link Tile} is removed.
  */
 @Data
-public class GameObjectDespawned
+public class GameObjectDespawned implements Event
 {
 	/**
 	 * The affected tile.

runelite-api/src/main/java/net/runelite/api/events/GameObjectSpawned.java

@@ -32,7 +32,7 @@ import lombok.Data;
  * An event where a {@link GameObject} is added to a {@link Tile}.
  */
 @Data
-public class GameObjectSpawned
+public class GameObjectSpawned implements Event
 {
 	/**
 	 * The affected tile.

runelite-api/src/main/java/net/runelite/api/events/GameStateChanged.java

@@ -31,7 +31,7 @@ import lombok.Data;
  * An event where the clients game state has changed.
  */
 @Data
-public class GameStateChanged
+public class GameStateChanged implements Event
 {
 	/**
 	 * The new game state.

runelite-api/src/main/java/net/runelite/api/events/GameTick.java

@@ -41,7 +41,7 @@ package net.runelite.api.events;
  * Note that occurrences that take place purely on the client, such as right
  * click menus, are independent of the game tick.
  */
-public class GameTick
+public class GameTick implements Event
 {
 	public static final GameTick INSTANCE = new GameTick();
 

runelite-api/src/main/java/net/runelite/api/events/GrandExchangeOfferChanged.java

@@ -41,7 +41,7 @@ import lombok.Data;
  * can change into.
  */
 @Data
-public class GrandExchangeOfferChanged
+public class GrandExchangeOfferChanged implements Event
 {
 	/**
 	 * The offer that has been modified.

runelite-api/src/main/java/net/runelite/api/events/GraphicsObjectCreated.java

@@ -31,7 +31,7 @@ import lombok.Value;
  * An event where a new {@link GraphicsObject} has been created.
  */
 @Value
-public class GraphicsObjectCreated
+public class GraphicsObjectCreated implements Event
 {
 	/**
 	 * The newly created graphics object.

runelite-api/src/main/java/net/runelite/api/events/GroundObjectChanged.java

@@ -32,7 +32,7 @@ import lombok.Data;
  * An event where the {@link GroundObject} on a {@link Tile} has been changed.
  */
 @Data
-public class GroundObjectChanged
+public class GroundObjectChanged implements Event
 {
 	/**
 	 * The affected tile.

runelite-api/src/main/java/net/runelite/api/events/GroundObjectDespawned.java

@@ -32,7 +32,7 @@ import lombok.Data;
  * An event where a {@link GroundObject} on a {@link Tile} has been removed.
  */
 @Data
-public class GroundObjectDespawned
+public class GroundObjectDespawned implements Event
 {
 	/**
 	 * The affected tile.

runelite-api/src/main/java/net/runelite/api/events/GroundObjectSpawned.java

@@ -32,7 +32,7 @@ import lombok.Data;
  * An event where a {@link GroundObject} is added to a {@link Tile}.
  */
 @Data
-public class GroundObjectSpawned
+public class GroundObjectSpawned implements Event
 {
 	/**
 	 * The affected tile.

runelite-api/src/main/java/net/runelite/api/events/HitsplatApplied.java

@@ -36,7 +36,7 @@ import lombok.Data;
  * visible hitsplats.
  */
 @Data
-public class HitsplatApplied
+public class HitsplatApplied implements Event
 {
 	/**
 	 * The actor the hitsplat was applied to.

runelite-api/src/main/java/net/runelite/api/events/InteractChanged.java

@@ -28,7 +28,7 @@ import net.runelite.api.Actor;
 import lombok.Data;
 
 @Data
-public class InteractChanged
+public class InteractChanged implements Event
 {
 	private Actor actor;
 }

runelite-api/src/main/java/net/runelite/api/events/InteractingChanged.java

@@ -7,7 +7,7 @@ import lombok.Value;
  * An event called when the actor an actor is interacting with changes
  */
 @Value
-public class InteractingChanged
+public class InteractingChanged implements Event
 {
 	private final Actor source;
 

runelite-api/src/main/java/net/runelite/api/events/ItemContainerChanged.java

@@ -39,7 +39,7 @@ import lombok.Value;
  * </ul>
  */
 @Value
-public class ItemContainerChanged
+public class ItemContainerChanged implements Event
 {
 	/**
 	 * The modified container's ID.

runelite-api/src/main/java/net/runelite/api/events/ItemDespawned.java

@@ -34,7 +34,7 @@ import lombok.Value;
  * all item piles are implicitly despawned, and despawn events will not be sent.
  */
 @Value
-public class ItemDespawned
+public class ItemDespawned implements Event
 {
 	private final Tile tile;
 	private final TileItem item;

runelite-api/src/main/java/net/runelite/api/events/ItemQuantityChanged.java

@@ -33,7 +33,7 @@ import lombok.Value;
  * Called when the quantity of an item pile changes.
  */
 @Value
-public class ItemQuantityChanged
+public class ItemQuantityChanged implements Event
 {
 	private final TileItem item;
 	private final Tile tile;

runelite-api/src/main/java/net/runelite/api/events/ItemSpawned.java

@@ -34,7 +34,7 @@ import lombok.Value;
  * all item piles are implicitly reset and a new spawn event will be sent.
  */
 @Value
-public class ItemSpawned
+public class ItemSpawned implements Event
 {
 	private final Tile tile;
 	private final TileItem item;

runelite-api/src/main/java/net/runelite/api/events/LocalPlayerDeath.java

@@ -27,7 +27,7 @@ package net.runelite.api.events;
 /**
  * An event when the local player dies.
  */
-public class LocalPlayerDeath
+public class LocalPlayerDeath implements Event
 {
 	public static final LocalPlayerDeath INSTANCE = new LocalPlayerDeath();
 

runelite-api/src/main/java/net/runelite/api/events/MenuEntryAdded.java

@@ -33,7 +33,7 @@ import net.runelite.api.MenuEntry;
  */
 @Data
 @AllArgsConstructor
-public class MenuEntryAdded
+public class MenuEntryAdded implements Event
 {
 	/**
 	 * The MenuEntry object that was actually added

runelite-api/src/main/java/net/runelite/api/events/MenuOpened.java

@@ -31,7 +31,7 @@ import lombok.Data;
  * An event where a menu has been opened.
  */
 @Data
-public class MenuOpened
+public class MenuOpened implements Event
 {
 	/**
 	 * The menu entries in the newly opened menu.

runelite-api/src/main/java/net/runelite/api/events/MenuOptionClicked.java

@@ -42,7 +42,7 @@ import net.runelite.api.MenuEntry;
  * it seems that this event still triggers with the "Cancel" action.
  */
 @Data
-public class MenuOptionClicked
+public class MenuOptionClicked implements Event
 {
 	public MenuOptionClicked(MenuEntry entry)
 	{

runelite-api/src/main/java/net/runelite/api/events/MenuShouldLeftClick.java

@@ -31,7 +31,7 @@ import lombok.Data;
  * opened on left click.
  */
 @Data
-public class MenuShouldLeftClick
+public class MenuShouldLeftClick implements Event
 {
 	/**
 	 * If set to true, the menu will open on left click.

runelite-api/src/main/java/net/runelite/api/events/NameableNameChanged.java

@@ -31,7 +31,7 @@ import lombok.Value;
  * An event where a {@link Nameable} has had their name changed.
  */
 @Value
-public class NameableNameChanged
+public class NameableNameChanged implements Event
 {
 	/**
 	 * The nameable that changed names.

runelite-api/src/main/java/net/runelite/api/events/NpcActionChanged.java

@@ -31,7 +31,7 @@ import net.runelite.api.NPCDefinition;
  * An event where an action of an {@link NPCDefinition} has changed.
  */
 @Data
-public class NpcActionChanged
+public class NpcActionChanged implements Event
 {
 	/**
 	 * The NPC composition that has been changed.

runelite-api/src/main/java/net/runelite/api/events/NpcDefinitionChanged.java

@@ -31,7 +31,7 @@ import net.runelite.api.NPC;
  * Fires after the composition of an {@link NPC} changes.
  */
 @Value
-public class NpcDefinitionChanged
+public class NpcDefinitionChanged implements Event
 {
 	/**
 	 * The NPC of which the composition changed.

runelite-api/src/main/java/net/runelite/api/events/NpcDespawned.java

@@ -32,7 +32,7 @@ import lombok.Value;
  * An event where an {@link NPC} has despawned.
  */
 @Value
-public class NpcDespawned
+public class NpcDespawned implements Event
 {
 	/**
 	 * The despawned NPC.

runelite-api/src/main/java/net/runelite/api/events/NpcSpawned.java

@@ -32,7 +32,7 @@ import lombok.Value;
  * An event where an {@link NPC} has spawned.
  */
 @Value
-public class NpcSpawned
+public class NpcSpawned implements Event
 {
 	/**
 	 * The spawned NPC.

runelite-api/src/main/java/net/runelite/api/events/OverheadTextChanged.java

@@ -4,7 +4,7 @@ import net.runelite.api.Actor;
 import lombok.Value;
 
 @Value
-public class OverheadTextChanged
+public class OverheadTextChanged implements Event
 {
 	private final Actor actor;
 

runelite-api/src/main/java/net/runelite/api/events/PlayerDespawned.java

@@ -34,7 +34,7 @@ import lombok.Value;
  * Note: This event does not get called for the local player.
  */
 @Value
-public class PlayerDespawned
+public class PlayerDespawned implements Event
 {
 	/**
 	 * The despawned player.

runelite-api/src/main/java/net/runelite/api/events/PlayerMenuOptionClicked.java

@@ -31,7 +31,7 @@ import lombok.Data;
  * been clicked (ie. HiScore Lookup).
  */
 @Data
-public class PlayerMenuOptionClicked
+public class PlayerMenuOptionClicked implements Event
 {
 	/**
 	 * The menu option clicked.

runelite-api/src/main/java/net/runelite/api/events/PlayerMenuOptionsChanged.java

@@ -27,7 +27,7 @@ package net.runelite.api.events;
 import lombok.Data;
 
 @Data
-public class PlayerMenuOptionsChanged
+public class PlayerMenuOptionsChanged implements Event
 {
 	/**
 	 * Index in playerOptions which changed.

runelite-api/src/main/java/net/runelite/api/events/PlayerSpawned.java

@@ -32,7 +32,7 @@ import lombok.Value;
  * An event where a {@link Player} has spawned.
  */
 @Value
-public class PlayerSpawned
+public class PlayerSpawned implements Event
 {
 	/**
 	 * The spawned player.

runelite-api/src/main/java/net/runelite/api/events/PostHealthBar.java

@@ -28,7 +28,7 @@ import net.runelite.api.HealthBar;
 import lombok.Data;
 
 @Data
-public class PostHealthBar
+public class PostHealthBar implements Event
 {
 	private HealthBar healthBar;
 }

runelite-api/src/main/java/net/runelite/api/events/PostItemDefinition.java

@@ -32,7 +32,7 @@ import net.runelite.api.ItemDefinition;
  * its data is initialized.
  */
 @Data
-public class PostItemDefinition
+public class PostItemDefinition implements Event
 {
 	/**
 	 * The newly created item.

runelite-api/src/main/java/net/runelite/api/events/ProjectileMoved.java

@@ -35,7 +35,7 @@ import lombok.Data;
  * once (ie. AoE from Lizardman Shaman).
  */
 @Data
-public class ProjectileMoved
+public class ProjectileMoved implements Event
 {
 	/**
 	 * The projectile being moved.

runelite-api/src/main/java/net/runelite/api/events/ProjectileSpawned.java

@@ -32,7 +32,7 @@ import lombok.Data;
  * An event called whenever a {@link Projectile} has spawned.
  */
 @Data
-public class ProjectileSpawned
+public class ProjectileSpawned implements Event
 {
 	/**
 	 * The spawned projectile.

runelite-api/src/main/java/net/runelite/api/events/ResizeableChanged.java

@@ -32,7 +32,7 @@ import lombok.Data;
  * An event where the game has changed from fixed to resizable mode or vice versa.
  */
 @Data
-public class ResizeableChanged
+public class ResizeableChanged implements Event
 {
 	/**
 	 * Whether the game is in resizable mode.

runelite-api/src/main/java/net/runelite/api/events/ScriptCallbackEvent.java

@@ -31,7 +31,7 @@ import lombok.Data;
  * A callback from a runelite_callback opcode in a cs2
  */
 @Data
-public class ScriptCallbackEvent
+public class ScriptCallbackEvent implements Event
 {
 	/**
 	 * The script being called.

runelite-api/src/main/java/net/runelite/api/events/SoundEffectPlayed.java

@@ -27,7 +27,7 @@ package net.runelite.api.events;
 import lombok.Data;
 
 @Data
-public class SoundEffectPlayed
+public class SoundEffectPlayed implements Event
 {
 	private int soundId;
 	private int delay;

runelite-api/src/main/java/net/runelite/api/events/SpotAnimationChanged.java

@@ -19,7 +19,7 @@ import net.runelite.api.Actor;
  * @see net.runelite.api.GraphicID
  */
 @Data
-public class SpotAnimationChanged
+public class SpotAnimationChanged implements Event
 {
 	/**
 	 * The actor that has had their graphic changed.

runelite-api/src/main/java/net/runelite/api/events/UsernameChanged.java

@@ -30,7 +30,7 @@ package net.runelite.api.events;
  * This event triggers for every character change to the username
  * in the login screen.
  */
-public class UsernameChanged
+public class UsernameChanged implements Event
 {
 	public static final UsernameChanged INSTANCE = new UsernameChanged();
 

runelite-api/src/main/java/net/runelite/api/events/VarClientIntChanged.java

@@ -31,7 +31,7 @@ import lombok.Value;
  * An event where a varbit integer has changed.
  */
 @Value
-public class VarClientIntChanged
+public class VarClientIntChanged implements Event
 {
 	private int index;
 }

runelite-api/src/main/java/net/runelite/api/events/VarClientStrChanged.java

@@ -31,7 +31,7 @@ import lombok.Value;
  * An event where a varbit string has changed.
  */
 @Value
-public class VarClientStrChanged
+public class VarClientStrChanged implements Event
 {
 	private int index;
 }

runelite-api/src/main/java/net/runelite/api/events/VarbitChanged.java

@@ -32,7 +32,7 @@ import lombok.Data;
  * An event when a varbit or varplayer has changed.
  */
 @Data
-public class VarbitChanged
+public class VarbitChanged implements Event
 {
 	/**
 	 * Index in the varp array that was changed.

runelite-api/src/main/java/net/runelite/api/events/WallObjectChanged.java

@@ -32,7 +32,7 @@ import lombok.Data;
  * An event where the {@link WallObject} of a {@link Tile} has been changed.
  */
 @Data
-public class WallObjectChanged
+public class WallObjectChanged implements Event
 {
 	/**
 	 * The affected tile.

runelite-api/src/main/java/net/runelite/api/events/WallObjectDespawned.java

@@ -32,7 +32,7 @@ import lombok.Data;
  * An event where a {@link WallObject} on a {@link Tile} has been removed.
  */
 @Data
-public class WallObjectDespawned
+public class WallObjectDespawned implements Event
 {
 	/**
 	 * The affected tile.

runelite-api/src/main/java/net/runelite/api/events/WallObjectSpawned.java

@@ -32,7 +32,7 @@ import lombok.Data;
  * An event where a {@link WallObject} is added to a {@link Tile}.
  */
 @Data
-public class WallObjectSpawned
+public class WallObjectSpawned implements Event
 {
 	/**
 	 * The affected tile.

runelite-api/src/main/java/net/runelite/api/events/WidgetHiddenChanged.java

@@ -31,7 +31,7 @@ import lombok.Data;
  * An event where the hidden state of a {@link Widget} has been modified.
  */
 @Data
-public class WidgetHiddenChanged
+public class WidgetHiddenChanged implements Event
 {
 	/**
 	 * The affected widget.

runelite-api/src/main/java/net/runelite/api/events/WidgetLoaded.java

@@ -30,7 +30,7 @@ import lombok.Data;
  * An event where a {@link net.runelite.api.widgets.Widget} has been loaded.
  */
 @Data
-public class WidgetLoaded
+public class WidgetLoaded implements Event
 {
 	/**
 	 * The group ID of the loaded widget.

runelite-api/src/main/java/net/runelite/api/events/WidgetMenuOptionClicked.java

@@ -31,7 +31,7 @@ import lombok.Data;
  * An event where an option has been clicked in a {@link net.runelite.api.widgets.Widget}s menu.
  */
 @Data
-public class WidgetMenuOptionClicked
+public class WidgetMenuOptionClicked implements Event
 {
 	/**
 	 * The clicked menu option.

runelite-api/src/main/java/net/runelite/api/events/WidgetPositioned.java

@@ -28,7 +28,7 @@ package net.runelite.api.events;
  * An event where the position of a {@link net.runelite.api.widgets.Widget}
  * relative to its parent has changed.
  */
-public class WidgetPositioned
+public class WidgetPositioned implements Event
 {
 	public static final WidgetPositioned INSTANCE = new WidgetPositioned();
 

runelite-api/src/main/java/net/runelite/api/events/WidgetPressed.java

@@ -31,7 +31,7 @@ import lombok.Data;
  * An event where a draggable widget has been pressed.
  */
 @Data
-public class WidgetPressed
+public class WidgetPressed implements Event
 {
 	public static final WidgetPressed INSTANCE = new WidgetPressed();
 

runelite-api/src/main/java/net/runelite/api/events/WorldListLoad.java

@@ -31,7 +31,7 @@ import lombok.Value;
  * Event when the world list is loaded for the world switcher
  */
 @Value
-public class WorldListLoad
+public class WorldListLoad implements Event
 {
 	private final World[] worlds;
 }

runelite-api/src/main/java/net/runelite/api/hooks/Callbacks.java

@@ -25,6 +25,7 @@
 package net.runelite.api.hooks;
 
 import net.runelite.api.MainBufferProvider;
+import net.runelite.api.events.Event;
 import net.runelite.api.widgets.WidgetItem;
 import java.awt.Graphics;
 import java.awt.event.KeyEvent;
@@ -41,14 +42,14 @@ public interface Callbacks
 	 *
 	 * @param event the event
 	 */
-	<T> void post(Class<T> eventClass, Object event);
+	<T> void post(Class<T> eventClass, Event event);
 
 	/**
 	 * Post a deferred event, which gets delayed until the next cycle.
 	 *
 	 * @param event the event
 	 */
-	<T> void postDeferred(Class<T> eventClass, Object event);
+	<T> void postDeferred(Class<T> eventClass, Event event);
 
 	/**
 	 * Called each client cycle.