ContainerHexianOresTileEntity.java

package com.HexianMods.HexianOres.guicontainer;

import com.HexianMods.HexianOres.tileentity.HexianOresTileEntity;

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 ContainerHexianOresTileEntity extends Container{

    private HexianOresTileEntity te;

    public ContainerHexianOresTileEntity(IInventory playerInv, HexianOresTileEntity te){
        this.te = te;

        int y1 = 17;

        for (int x = 0; x < 3; ++x) {
            this.addSlotToContainer(new Slot(te, x + y1 * 3, 62 + x * 18, 17 + y1 * 18));
            y1++;
        }

        for (int y = 0; y < 3; ++y) {
            for (int x = 0; x < 9; ++x) {
                this.addSlotToContainer(new Slot(playerInv, x + y * 9 + 9, 8 + x * 18, 84 + y * 18));
            }
        }

        for (int x = 0; x < 9; ++x) {
            this.addSlotToContainer(new Slot(playerInv, x, 8 + x * 18, 142));
        }
    }

    @Override
    public ItemStack transferStackInSlot(EntityPlayer playerIn, int fromSlot){
        ItemStack previous = null;
        Slot slot = (Slot) this.inventorySlots.get(fromSlot);

        if(slot != null && slot.getHasStack()){
            ItemStack current = slot.getStack();
            previous = current.copy();

            if(fromSlot < 3){
                if(!this.mergeItemStack(current, 3, 39, true)){
                    return null;
                }
            }else{
                if(!this.mergeItemStack(current, 0, 3, false)){
                    return null;
                }
            }

            if(current.stackSize == 0){
                slot.putStack((ItemStack) null);
            }else{
                slot.onSlotChanged();
            }

            if(current.stackSize == previous.stackSize){
                return null;
            }

            slot.onPickupFromSlot(playerIn, current);
        }
        return previous;
    }

    @Override
    public boolean canInteractWith(EntityPlayer playerIn){
        return this.te.isUseableByPlayer(playerIn);
    }

}