TombStoneContainer.java

package TombStone;

import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.entity.player.InventoryPlayer;
import net.minecraft.inventory.Container;
import net.minecraft.inventory.Slot;
import net.minecraft.item.ItemStack;

public class TombStoneContainer extends Container {
	protected TombStoneTileEntity tileEntity;
	
	public TombStoneContainer (InventoryPlayer inventoryPlayer, TombStoneTileEntity te){
		tileEntity = te;
		
		//the Slot constructor takes the IInventory and the slot number in that it binds to
		//and the x-y coordinates it resides on-screen
		for (int i = 0; i < 6; i++) {
			for (int j = 0; j < 9; j++) {
				addSlotToContainer(new Slot(tileEntity, j + i * 9, 8 + j * 18, 18 + i * 18));
			}
		}
		
		//commonly used vanilla code that adds the player's inventory
		bindPlayerInventory(inventoryPlayer);
	}
	
	@Override
	public boolean canInteractWith(EntityPlayer player) {
	        return tileEntity.isUseableByPlayer(player);
	}
	
	
	protected void bindPlayerInventory(InventoryPlayer inventoryPlayer) {
		for (int i = 0; i < 3; i++) {
			for (int j = 0; j < 9; j++) {
				addSlotToContainer(new Slot(inventoryPlayer, j + i * 9 + 9, 8 + j * 18, 139 + i * 18));
			}
		}
		
		for (int i = 0; i < 9; i++) {
			addSlotToContainer(new Slot(inventoryPlayer, i, 8 + i * 18, 197));
		}
	}
	
	@Override
	public ItemStack transferStackInSlot(EntityPlayer player, int slot) {
		ItemStack stack = null;
		Slot slotObject = (Slot) inventorySlots.get(slot);
		
		//null checks and checks if the item can be stacked (maxStackSize > 1)
		if (slotObject != null && slotObject.getHasStack()) {
			ItemStack stackInSlot = slotObject.getStack();
			stack = stackInSlot.copy();
			
			//merges the item into player inventory since its in the tileEntity
			if (slot < 54) {
			        if (!this.mergeItemStack(stackInSlot, 54, 90, true)) {
			                return null;
			        }
			}
			//places it into the tileEntity is possible since its in the player inventory
			else if (!this.mergeItemStack(stackInSlot, 0, 54, false)) {
			        return null;
			}
			
			if (stackInSlot.stackSize == 0) {
			        slotObject.putStack(null);
			} else {
			        slotObject.onSlotChanged();
			}
			
			if (stackInSlot.stackSize == stack.stackSize) {
			        return null;
			}
			slotObject.onPickupFromSlot(player, stackInSlot);
		}
		return stack;
	}
}