ContainerCrate.java

package com.mrcrayfish.furniture.gui.containers;

import com.mrcrayfish.furniture.gui.slots.SlotMail;

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

public class ContainerCrate extends Container
{
	private IInventory crateInventory;

	public ContainerCrate(IInventory playerInventory, IInventory crateInventory)
	{
		this.crateInventory = crateInventory;

		for (int y = 0; y < 4; y++)
		{
			for (int x = 0; x < 4; ++x)
			{
				this.addSlotToContainer(new SlotMail(crateInventory, x + y * 4, x * 18 + 53, y * 18 + 8));
			}
		}

		for (int i = 0; i < 3; i++)
		{
			for (int j = 0; j < 9; ++j)
			{
				this.addSlotToContainer(new Slot(playerInventory, j + i * 9 + 9, j * 18 + 8, i * 18 + 111));
			}
		}

		for (int i = 0; i < 9; i++)
		{
			this.addSlotToContainer(new Slot(playerInventory, i, i * 18 + 8, 169));
		}
	}

	@Override
	public boolean canInteractWith(EntityPlayer par1EntityPlayer)
	{
		return this.crateInventory.isUsableByPlayer(par1EntityPlayer);
	}

	@Override
	public ItemStack transferStackInSlot(EntityPlayer player, int slotNum)
	{
		ItemStack itemCopy = ItemStack.EMPTY;
		Slot slot = (Slot) this.inventorySlots.get(slotNum);

		if (slot != null && slot.getHasStack())
		{
			ItemStack item = slot.getStack();
			itemCopy = item.copy();

			if (slotNum < crateInventory.getSizeInventory())
			{
				if (!this.mergeItemStack(item, crateInventory.getSizeInventory(), this.inventorySlots.size(), true))
				{
					return ItemStack.EMPTY;
				}
			}
			else if (!this.mergeItemStack(item, 0, crateInventory.getSizeInventory(), false))
			{
				return ItemStack.EMPTY;
			}

			if (item.getCount() == 0)
			{
				slot.putStack(ItemStack.EMPTY);
			}
			else
			{
				slot.onSlotChanged();
			}
		}

		return itemCopy;
	}
}