Chisel/src/main/java/com/cricketcraft/chisel/block/BlockCarvableSlab.java

package com.cricketcraft.chisel.block;

import static net.minecraftforge.common.util.ForgeDirection.DOWN;
import static net.minecraftforge.common.util.ForgeDirection.UP;

import java.util.List;
import java.util.Random;

import net.minecraft.block.Block;
import net.minecraft.block.BlockCompressedPowered;
import net.minecraft.block.BlockFarmland;
import net.minecraft.block.BlockHopper;
import net.minecraft.block.BlockSlab;
import net.minecraft.block.BlockSnow;
import net.minecraft.block.BlockStairs;
import net.minecraft.creativetab.CreativeTabs;
import net.minecraft.entity.Entity;
import net.minecraft.item.Item;
import net.minecraft.item.ItemStack;
import net.minecraft.util.AxisAlignedBB;
import net.minecraft.util.IIcon;
import net.minecraft.util.MovingObjectPosition;
import net.minecraft.world.IBlockAccess;
import net.minecraft.world.World;
import net.minecraftforge.common.util.ForgeDirection;
import cpw.mods.fml.relauncher.Side;
import cpw.mods.fml.relauncher.SideOnly;

public class BlockCarvableSlab extends BlockCarvable {

	public Block master;
	public BlockCarvableSlab bottom;
	public BlockCarvableSlab top;
	public boolean isBottom;

	public BlockCarvableSlab(BlockCarvable marble) {
		opaque = true;

		setBlockBounds(0.0F, 0.0F, 0.0F, 1.0F, 0.5F, 1.0F);

		master = marble;
		bottom = this;
		top = new BlockCarvableSlab(this);

		isBottom = true;
	}

	public BlockCarvableSlab(BlockCarvableSlab bottomBlock) {
		super();
		setBlockBounds(0.0F, 0.5F, 0.0F, 1.0F, 1.0F, 1.0F);
		master = bottomBlock.master;
		bottom = bottomBlock;
		top = this;

		carverHelper = bottomBlock.carverHelper;
		isBottom = false;
	}

	@Override
	public void setBlockBoundsBasedOnState(IBlockAccess par1IBlockAccess, int par2, int par3, int par4) {
		if (isBottom) {
			setBlockBounds(0.0F, 0.0F, 0.0F, 1.0F, 0.5F, 1.0F);
		} else {
			setBlockBounds(0.0F, 0.5F, 0.0F, 1.0F, 1.0F, 1.0F);
		}
	}

	@Override
	public void setBlockBoundsForItemRender() {
		setBlockBounds(0.0F, 0.0F, 0.0F, 1.0F, 0.5F, 1.0F);
	}

	@Override
	public void addCollisionBoxesToList(World par1World, int par2, int par3, int par4, AxisAlignedBB par5AxisAlignedBB, List par6List, Entity par7Entity) {
		setBlockBoundsBasedOnState(par1World, par2, par3, par4);
		super.addCollisionBoxesToList(par1World, par2, par3, par4, par5AxisAlignedBB, par6List, par7Entity);
	}

	@Override
	public boolean isOpaqueCube() {
		return false;
	}

	@Override
	public int damageDropped(int meta) {
		return meta;
	}

	@Override
	public Item getItemDropped(int par1, Random par2Random, int par3) {
		return Item.getItemFromBlock(bottom);
	}

	@Override
	public boolean renderAsNormalBlock() {
		return false;
	}

	@Override
	@SideOnly(Side.CLIENT)
	public ItemStack getPickBlock(MovingObjectPosition mop, World world, int x, int y, int z) {
		return new ItemStack(bottom, 1, world.getBlockMetadata(x, y, z));
	}

	@Override
	public IIcon getIcon(int side, int metadata) {
		return carverHelper.getIcon(side, metadata);
		// return master.getIcon(side, metadata);
	}

	@Override
	public void getSubBlocks(Item block, CreativeTabs tabs, List list) {
		if (isBottom)
			super.getSubBlocks(block, tabs, list);
	}
	/**
     * Checks if the block is a solid face on the given side, used by placement logic.
     *
     * @param world The current world
     * @param x X Position
     * @param y Y position
     * @param z Z position
     * @param side The side to check
     * @return True if the block is solid on the specified side.
     */
	@Override
    public boolean isSideSolid(IBlockAccess world, int x, int y, int z, ForgeDirection side)
    {
        return !isBottom && (side == UP);
    }

}