addition of PlayerGameModeChangeEvent

By: sunkid <sunkid@iminurnetz.com>

paper-api/src/main/java/org/bukkit/command/defaults/GameModeCommand.java

@@ -39,6 +39,10 @@ public class GameModeCommand extends VanillaCommand {
                     Command.broadcastCommandMessage(sender, "Setting " + player.getName() + " to game mode " + mode.getValue());
 
                     player.setGameMode(mode);
+
+                    if (mode != player.getGameMode()) {
+                        Command.broadcastCommandMessage(sender, "The game mode change for " + player.getName() + " was cancelled!");
+                    }
                 } else {
                     sender.sendMessage(player.getName() + " already has game mode " + mode.getValue());
                 }

paper-api/src/main/java/org/bukkit/event/Event.java

@@ -301,6 +301,13 @@ public abstract class Event implements Serializable {
          */
         PLAYER_FISH(Category.PLAYER),
 
+        /**
+         * Called when the game mode of a player is changed
+         * 
+         * @see org.bukkit.event.player.PlayerGameModeChangeEvent
+         */
+        PLAYER_GAME_MODE_CHANGE(Category.PLAYER),
+
         /**
          * BLOCK EVENTS
          */

paper-api/src/main/java/org/bukkit/event/player/PlayerGameModeChangeEvent.java

@@ -0,0 +1,28 @@
+package org.bukkit.event.player;
+
+import org.bukkit.GameMode;
+import org.bukkit.entity.Player;
+import org.bukkit.event.Cancellable;
+
+public class PlayerGameModeChangeEvent extends PlayerEvent implements Cancellable {
+
+    private boolean cancelled;
+    private GameMode newGameMode;
+
+    public PlayerGameModeChangeEvent(Player player, GameMode newGameMode) {
+        super(Type.PLAYER_GAME_MODE_CHANGE, player);
+        this.newGameMode = newGameMode;
+    }
+
+    public boolean isCancelled() {
+        return cancelled;
+    }
+
+    public void setCancelled(boolean cancel) {
+        this.cancelled = cancel;
+    }
+
+    public GameMode getNewGameMode() {
+        return newGameMode;
+    }
+}

paper-api/src/main/java/org/bukkit/event/player/PlayerListener.java

@@ -191,4 +191,11 @@ public class PlayerListener implements Listener {
      * @param event Relevant event details
      */
     public void onPlayerFish(PlayerFishEvent event) {}
+    
+    /**
+     * Called when a player's game mode is changed
+     * 
+     * @param event Relevant event details
+     */
+    public void onPlayerGameModeChange(PlayerGameModeChangeEvent event) {}
 }

paper-api/src/main/java/org/bukkit/plugin/java/JavaPluginLoader.java

@@ -419,6 +419,13 @@ public class JavaPluginLoader implements PluginLoader {
                     ((PlayerListener) listener).onPlayerFish((PlayerFishEvent) event);
                 }
             };
+            
+        case PLAYER_GAME_MODE_CHANGE:
+            return new EventExecutor() {
+                public void execute(Listener listener, Event event) {
+                    ((PlayerListener) listener).onPlayerGameModeChange((PlayerGameModeChangeEvent) event);
+                }
+            };
 
         // Block Events
         case BLOCK_PHYSICS: