Add EditBookEvent (#1120)

src/main/java/net/minestom/server/event/book/EditBookEvent.java

@@ -0,0 +1,53 @@
+package net.minestom.server.event.book;
+
+import net.minestom.server.entity.Player;
+import net.minestom.server.event.trait.EntityInstanceEvent;
+import net.minestom.server.event.trait.ItemEvent;
+import net.minestom.server.event.trait.PlayerEvent;
+import net.minestom.server.item.ItemStack;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.List;
+
+public class EditBookEvent implements PlayerEvent, EntityInstanceEvent, ItemEvent {
+
+    private final Player player;
+    private final ItemStack itemStack;
+    private final List<String> pages;
+    private final String title;
+
+    public EditBookEvent(
+            @NotNull Player player,
+            @NotNull ItemStack itemStack,
+            @NotNull List<String> pages,
+            @Nullable String title
+    ) {
+        this.player = player;
+        this.itemStack = itemStack;
+        this.pages = pages;
+        this.title = title;
+    }
+
+    @Override
+    public @NotNull Player getPlayer() {
+        return player;
+    }
+
+    @Override
+    public @NotNull ItemStack getItemStack() {
+        return itemStack;
+    }
+
+    public @NotNull List<String> getPages() {
+        return pages;
+    }
+
+    public @Nullable String getTitle() {
+        return title;
+    }
+
+    public boolean isSigned() {
+        return title != null;
+    }
+}

src/main/java/net/minestom/server/listener/BookListener.java

@@ -0,0 +1,18 @@
+package net.minestom.server.listener;
+
+import net.minestom.server.entity.Player;
+import net.minestom.server.event.EventDispatcher;
+import net.minestom.server.event.book.EditBookEvent;
+import net.minestom.server.item.ItemStack;
+import net.minestom.server.network.packet.client.play.ClientEditBookPacket;
+import net.minestom.server.utils.inventory.PlayerInventoryUtils;
+
+public class BookListener {
+
+    public static void listener(ClientEditBookPacket packet, Player player) {
+        int slot = PlayerInventoryUtils.convertClientInventorySlot(packet.slot());
+        ItemStack itemStack = player.getInventory().getItemStack(slot);
+        EventDispatcher.call(new EditBookEvent(player, itemStack, packet.pages(), packet.title()));
+    }
+
+}

src/main/java/net/minestom/server/listener/manager/PacketListenerManager.java

@@ -55,6 +55,7 @@ public final class PacketListenerManager {
         setListener(ClientResourcePackStatusPacket.class, ResourcePackListener::listener);
         setListener(ClientAdvancementTabPacket.class, AdvancementTabListener::listener);
         setListener(ClientSpectatePacket.class, SpectateListener::listener);
+        setListener(ClientEditBookPacket.class, BookListener::listener);
     }
 
     /**

src/main/java/net/minestom/server/utils/inventory/PlayerInventoryUtils.java

@@ -76,4 +76,20 @@ public final class PlayerInventoryUtils {
         }
         return slot;
     }
+
+    /**
+     * Used to convert the clients inventory slot to a Minestom slot.
+     * The client's inventory does not count the crafting slots.
+     *
+     * @param slot the client slot
+     * @return a slot which can be used internally with Minestom
+     */
+    public static int convertClientInventorySlot(int slot) {
+        if (slot == 36) return BOOTS_SLOT;
+        if (slot == 37) return LEGGINGS_SLOT;
+        if (slot == 38) return CHESTPLATE_SLOT;
+        if (slot == 39) return HELMET_SLOT;
+        if (slot == 40) return OFFHAND_SLOT;
+        return slot;
+    }
 }