public class BoxBlock extends BlockWithEntity {
    protected BoxBlock(Settings settings) {
        super(settings);
    }
    
    // 从 1.20.5 开始需要有这个方法。
    @Override
    protected MapCodec<? extends BoxBlock> getCodec() {
        return createCodec(BoxBlock::new);
    }

    @Override
    public BlockEntity createBlockEntity(BlockPos pos, BlockState state) {
        return new BoxBlockEntity(pos, state);
    }

    @Override
    public BlockRenderType getRenderType(BlockState state) {
        // 从 BlockWithEntity 继承的默认值为 INVISIBLE，所以这里需要进行改变！
        return BlockRenderType.MODEL;
    }

    @Override
    public ActionResult onUse(BlockState state, World world, BlockPos pos, PlayerEntity player, Hand hand, BlockHitResult hit) {
        if (!world.isClient) {
            // 这里会调用 BlockWithEntity 的 createScreenHandlerFactory 方法，会将返回的方块实体强转为
            // 一个 namedScreenHandlerFactory。如果你的方块没有继承 BlockWithEntity，那就需要单独实现 createScreenHandlerFactory。
            NamedScreenHandlerFactory screenHandlerFactory = state.createScreenHandlerFactory(world, pos);

            if (screenHandlerFactory != null) {
                // 这个调用会让服务器请求客户端开启合适的 Screenhandler
                player.openHandledScreen(screenHandlerFactory);
            }
        }
        return ActionResult.SUCCESS;
    }
    
    
    // 这个方法能让方块破坏时物品全部掉落
    @Override
    public void onStateReplaced(BlockState state, World world, BlockPos pos, BlockState newState, boolean moved) {
        if (state.getBlock() != newState.getBlock()) {
            BlockEntity blockEntity = world.getBlockEntity(pos);
            if (blockEntity instanceof BoxBlockEntity) {
                ItemScatterer.spawn(world, pos, (BoxBlockEntity)blockEntity);
                // 更新比较器
                world.updateComparators(pos,this);
            }
            super.onStateReplaced(state, world, pos, newState, moved);
        }
    }
    
    @Override
    public boolean hasComparatorOutput(BlockState state) {
        return true;
    }
    
    @Override
    public int getComparatorOutput(BlockState state, World world, BlockPos pos) {
        return ScreenHandler.calculateComparatorOutput(world.getBlockEntity(pos));
    }
}