Clean up some Adventure support code, implement another sendMessage overload

api/src/main/java/com/velocitypowered/api/proxy/ProxyAudience.java

@@ -1,12 +1,8 @@
 package com.velocitypowered.api.proxy;
 
 import net.kyori.adventure.audience.Audience;
-import net.kyori.adventure.bossbar.BossBar;
-import net.kyori.adventure.inventory.Book;
-import net.kyori.adventure.sound.Sound;
-import net.kyori.adventure.sound.SoundStop;
+import net.kyori.adventure.audience.MessageType;
 import net.kyori.adventure.text.Component;
-import net.kyori.adventure.title.Title;
 import org.checkerframework.checker.nullness.qual.NonNull;
 
 /**
@@ -23,52 +19,7 @@ public interface ProxyAudience extends Audience {
   void sendMessage(@NonNull Component message);
 
   @Override
-  default void sendActionBar(@NonNull Component message) {
-
-  }
-
-  @Override
-  default void showTitle(@NonNull Title title) {
-
-  }
-
-  @Override
-  default void clearTitle() {
-
-  }
-
-  @Override
-  default void resetTitle() {
-
-  }
-
-  @Override
-  default void showBossBar(@NonNull BossBar bar) {
-
-  }
-
-  @Override
-  default void hideBossBar(@NonNull BossBar bar) {
-
-  }
-
-  @Override
-  default void playSound(@NonNull Sound sound) {
-
-  }
-
-  @Override
-  default void playSound(@NonNull Sound sound, double x, double y, double z) {
-
-  }
-
-  @Override
-  default void stopSound(@NonNull SoundStop stop) {
-
-  }
-
-  @Override
-  default void openBook(@NonNull Book book) {
-
+  default void sendMessage(@NonNull Component message, @NonNull MessageType type) {
+    sendMessage(message);
   }
 }

proxy/src/main/java/com/velocitypowered/proxy/connection/client/ConnectedPlayer.java

@@ -65,6 +65,7 @@ import java.util.UUID;
 import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.CompletionException;
 import java.util.concurrent.ThreadLocalRandom;
+import net.kyori.adventure.audience.MessageType;
 import net.kyori.adventure.bossbar.BossBar;
 import net.kyori.adventure.text.Component;
 import net.kyori.adventure.text.TextComponent;
@@ -260,6 +261,16 @@ public class ConnectedPlayer implements MinecraftConnectionAssociation, Player {
     connection.write(Chat.createClientbound(message, this.getProtocolVersion()));
   }
 
+  @Override
+  public void sendMessage(@NonNull Component message, @NonNull MessageType type) {
+    Preconditions.checkNotNull(message, "message");
+    Preconditions.checkNotNull(type, "type");
+
+    Chat packet = Chat.createClientbound(message, this.getProtocolVersion());
+    packet.setType(type == MessageType.CHAT ? Chat.CHAT_TYPE : Chat.SYSTEM_TYPE);
+    connection.write(packet);
+  }
+
   @Override
   public void sendActionBar(net.kyori.adventure.text.@NonNull Component message) {
     if (getProtocolVersion().compareTo(ProtocolVersion.MINECRAFT_1_11) >= 0) {

proxy/src/main/java/com/velocitypowered/proxy/protocol/packet/Chat.java

@@ -13,6 +13,8 @@ import java.util.UUID;
 public class Chat implements MinecraftPacket {
 
   public static final byte CHAT_TYPE = (byte) 0;
+  public static final byte SYSTEM_TYPE = (byte) 1;
+
   public static final int MAX_SERVERBOUND_MESSAGE_LENGTH = 256;
   public static final UUID EMPTY_SENDER = new UUID(0, 0);