Method onItemUse

src/main/java/net/minecraft/item/ItemSlab.java:50–87

Called when a Block is right-clicked with this Item @param pos The block being right-clicked @param side The side being right-clicked

(ItemStack stack, EntityPlayer playerIn, World worldIn, BlockPos pos, EnumFacing side, float hitX, float hitY, float hitZ)

     * @param side The side being right-clicked
     */
    public boolean onItemUse(ItemStack stack, EntityPlayer playerIn, World worldIn, BlockPos pos, EnumFacing side, float hitX, float hitY, float hitZ)
    {
        if (stack.stackSize == 0)
        {
            return false;
        }
        else if (!playerIn.canPlayerEdit(pos.offset(side), side, stack))
        {
            return false;
        }
        else
        {
            Object object = this.singleSlab.getVariant(stack);
            IBlockState iblockstate = worldIn.getBlockState(pos);

            if (iblockstate.getBlock() == this.singleSlab)
            {
                IProperty iproperty = this.singleSlab.getVariantProperty();
                Comparable comparable = iblockstate.getValue(iproperty);
                BlockSlab.EnumBlockHalf blockslab$enumblockhalf = iblockstate.getValue(BlockSlab.HALF);

                if ((side == EnumFacing.UP && blockslab$enumblockhalf == BlockSlab.EnumBlockHalf.BOTTOM || side == EnumFacing.DOWN && blockslab$enumblockhalf == BlockSlab.EnumBlockHalf.TOP) && comparable == object)
                {
                    IBlockState iblockstate1 = this.doubleSlab.getDefaultState().withProperty(iproperty, comparable);

                    if (worldIn.checkNoEntityCollision(this.doubleSlab.getCollisionBoundingBox(worldIn, pos, iblockstate1)) && worldIn.setBlockState(pos, iblockstate1, 3))
                    {
                        worldIn.playSoundEffect((float)pos.getX() + 0.5F, (float)pos.getY() + 0.5F, (float)pos.getZ() + 0.5F, this.doubleSlab.stepSound.getPlaceSound(), (this.doubleSlab.stepSound.getVolume() + 1.0F) / 2.0F, this.doubleSlab.stepSound.getFrequency() * 0.8F);
                        --stack.stackSize;
                    }

                    return true;
                }
            }

            return this.tryPlace(stack, worldIn, pos.offset(side), object) ? true : super.onItemUse(stack, playerIn, worldIn, pos, side, hitX, hitY, hitZ);
        }
    }

    public boolean canPlaceBlockOnSide(World worldIn, BlockPos pos, EnumFacing side, EntityPlayer player, ItemStack stack)
    {