public class BoxBlock extends BlockWithEntity {
    protected BoxBlock(Settings settings) {
        super(settings);
    }

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

    @Override
    public BlockRenderType getRenderType(BlockState state) {
        //With inheriting from BlockWithEntity this defaults to INVISIBLE, so we need to change that!
        return BlockRenderType.MODEL;
    }

    @Override
    public ActionResult onUse(BlockState state, World world, BlockPos pos, PlayerEntity player, Hand hand, BlockHitResult hit) {
        if (!world.isClient) {
            //This will call the createScreenHandlerFactory method from BlockWithEntity, which will return our blockEntity casted to
            //a namedScreenHandlerFactory. If your block class does not extend BlockWithEntity, it needs to implement createScreenHandlerFactory.
            NamedScreenHandlerFactory screenHandlerFactory = state.createScreenHandlerFactory(world, pos);

            if (screenHandlerFactory != null) {
                //With this call the server will request the client to open the appropriate Screenhandler
                player.openHandledScreen(screenHandlerFactory);
            }
        }
        return ActionResult.SUCCESS;
    }
    
    
    //This method will drop all items onto the ground when the block is broken
    @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);
                // update comparators
                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));
    }
}