WIP: Add openBook Implementation

src/main/java/com/loohp/limbo/network/protocol/packets/ClientboundOpenBookPacket.java

@@ -0,0 +1,29 @@
+package com.loohp.limbo.network.protocol.packets;
+
+import java.io.ByteArrayOutputStream;
+import java.io.DataOutputStream;
+import java.io.IOException;
+
+public class ClientboundOpenBookPacket extends PacketOut {
+
+    private final int hand; // 0 = main hand, 1 = off hand
+
+    public ClientboundOpenBookPacket(int hand) {
+        this.hand = hand;
+    }
+
+    public int getHand() {
+        return hand;
+    }
+
+    @Override
+    public byte[] serializePacket() throws IOException {
+        ByteArrayOutputStream buffer = new ByteArrayOutputStream();
+
+        DataOutputStream output = new DataOutputStream(buffer);
+        output.writeByte(Packet.getPlayOut().get(getClass()));
+        output.writeByte(hand);
+
+        return buffer.toByteArray();
+    }
+}

src/main/java/com/loohp/limbo/player/Player.java

@@ -34,10 +34,12 @@ import com.loohp.limbo.events.player.PlayerTeleportEvent;
 import com.loohp.limbo.inventory.Inventory;
 import com.loohp.limbo.inventory.InventoryHolder;
 import com.loohp.limbo.inventory.InventoryView;
+import com.loohp.limbo.inventory.ItemStack;
 import com.loohp.limbo.inventory.TitledInventory;
 import com.loohp.limbo.location.Location;
 import com.loohp.limbo.network.ClientConnection;
 import com.loohp.limbo.network.protocol.packets.ClientboundClearTitlesPacket;
+import com.loohp.limbo.network.protocol.packets.ClientboundOpenBookPacket;
 import com.loohp.limbo.network.protocol.packets.ClientboundSetActionBarTextPacket;
 import com.loohp.limbo.network.protocol.packets.ClientboundSetSubtitleTextPacket;
 import com.loohp.limbo.network.protocol.packets.ClientboundSetTitleTextPacket;
@@ -53,6 +55,7 @@ import com.loohp.limbo.network.protocol.packets.PacketPlayOutPlayerListHeaderFoo
 import com.loohp.limbo.network.protocol.packets.PacketPlayOutPositionAndLook;
 import com.loohp.limbo.network.protocol.packets.PacketPlayOutResourcePackSend;
 import com.loohp.limbo.network.protocol.packets.PacketPlayOutRespawn;
+import com.loohp.limbo.network.protocol.packets.PacketPlayOutSetSlot;
 import com.loohp.limbo.network.protocol.packets.PacketPlayOutStopSound;
 import com.loohp.limbo.sounds.SoundEffect;
 import com.loohp.limbo.utils.BungeecordAdventureConversionUtils;
@@ -68,11 +71,15 @@ import net.kyori.adventure.sound.Sound.Emitter;
 import net.kyori.adventure.sound.SoundStop;
 import net.kyori.adventure.text.Component;
 import net.kyori.adventure.text.serializer.legacy.LegacyComponentSerializer;
+import net.kyori.adventure.text.serializer.plain.PlainTextComponentSerializer;
 import net.kyori.adventure.title.Title;
 import net.kyori.adventure.title.Title.Times;
 import net.kyori.adventure.title.TitlePart;
 import net.md_5.bungee.api.ChatColor;
 import net.md_5.bungee.api.chat.BaseComponent;
+import net.querz.nbt.tag.CompoundTag;
+import net.querz.nbt.tag.ListTag;
+import net.querz.nbt.tag.StringTag;
 
 import java.io.IOException;
 import java.time.Duration;
@@ -469,7 +476,34 @@ public class Player extends LivingEntity implements CommandSender, InventoryHold
 
 	@Override
 	public void openBook(Book book) {
-		throw new UnsupportedOperationException("This function has not been implemented yet.");
+		ItemStack item = new ItemStack(Key.key("minecraft:written_book"));
+		CompoundTag nbt = new CompoundTag();
+		nbt.putString("title", PlainTextComponentSerializer.plainText().serialize(book.title()));
+		nbt.putString("author", PlainTextComponentSerializer.plainText().serialize(book.author()));
+		ListTag<StringTag> pages = new ListTag<>(StringTag.class);
+		for (Component page : book.pages()) {
+			pages.add(new StringTag(PlainTextComponentSerializer.plainText().serialize(page)));
+		}
+		nbt.put("pages", pages);
+		item.nbt(nbt);
+		PacketPlayOutSetSlot setSlot = new PacketPlayOutSetSlot(0, 0,0, item);
+		try {
+			clientConnection.sendPacket(setSlot);
+		} catch (IOException e) {
+			e.printStackTrace();
+		}
+		ClientboundOpenBookPacket openBook = new ClientboundOpenBookPacket(0);
+		try {
+			clientConnection.sendPacket(openBook);
+		} catch (IOException e) {
+			e.printStackTrace();
+		}
+		PacketPlayOutSetSlot resetSlot = new PacketPlayOutSetSlot(0, 0,0, getInventory().getItemInMainHand());
+		try {
+			clientConnection.sendPacket(resetSlot);
+		} catch (IOException e) {
+			e.printStackTrace();
+		}
 	}
 
 	@Override

src/main/resources/mapping.json

@@ -64,6 +64,7 @@
     "PacketPlayOutStopSound": "0x5F",
     "PacketPlayOutWindowItems": "0x10",
     "PacketPlayOutSetSlot": "0x12",
+    "ClientboundOpenBookPacket": "0x2B",
     "PacketPlayOutOpenWindow": "0x2C",
     "PacketPlayOutCloseWindow": "0x0F",
     "PacketPlayOutWindowData": "0x11"