public class BoxBlockEntity extends BlockEntity implements ExtendedScreenHandlerFactory, ImplementedInventory {
    private final DefaultedList<ItemStack> inventory = DefaultedList.ofSize(9, ItemStack.EMPTY);

    public BoxBlockEntity() {
        super(Test.BOX_BLOCK_ENTITY);
    }


    //来自 ImplementedInventory 接口

    @Override
    public DefaultedList<ItemStack> getItems() {
        return inventory;

    }

    //这些方法来自 NamedScreenHandlerFactory 接口

    @Override
    public @Nullable ScreenHandler createMenu(int syncId, PlayerInventory playerInventory, PlayerEntity player) {
        //我们将它提供给 screenHandler 作为我们的类实现 Inventory
        //一开始只有服务器(Server)有 Inventory ，这将在 ScreenHandler 中同步到客户端(Cilent)
        return new BoxScreenHandler(syncId, playerInventory, this);
    }

    @Override
    public Text getDisplayName() {
        return new TranslatableText(getCachedState().getBlock().getTranslationKey());
    }

    //此方法来自 ExtendedScreenHandlerFactory

    //当它请求客户端(client)打开 screenHandler 时，在服务器(server)上调用此方法
    //您写入 packetByteBuf 的内容将自动以(数据)包的形式传输到客户端
    //并在客户端(client)调用带有 packetByteBuf 参数的 ScreenHandler 构造函数
    //
    //您在此处插入内容的顺序与您需要提取它们的顺序相同。您不需要颠倒顺序！
    @Override
    public void writeScreenOpeningData(ServerPlayerEntity serverPlayerEntity, PacketByteBuf packetByteBuf) {
        //pos 字段是 BlockEntity 的公共字段
        packetByteBuf.writeBlockPos(pos);
    }
}