ContainerNetherrackFurnace.java

package qwertyasdef.alchemtrans.inventory;

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;
import qwertyasdef.alchemtrans.Tile.TileNetherrackFurnace;

public class ContainerNetherrackFurnace extends Container {

    private TileNetherrackFurnace tileEntity;

    public ContainerNetherrackFurnace(IInventory playerInv, TileNetherrackFurnace tileEntity) {
        this.tileEntity = tileEntity;

        /*
        SLOTS:
        Tile Entity: 0-1
        Player Inventory: 2-28
        Player Hotbar: 29-37
         */

        // Input
        this.addSlotToContainer(new Slot(tileEntity, 0, 56, 17));
        // Output
        this.addSlotToContainer(new Slot(tileEntity, 2, 116, 35));

        // Player inventory
        for (int i = 0; i < 3; ++i){
            for (int j = 0; j < 9; ++j) {
                this.addSlotToContainer(new Slot(playerInv, j + i * 9 + 9, 8 + j * 18, 84 + i * 18));
            }
        }

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

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

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

            // [...] Custom behaviour
            if (fromSlot < 2) {
                // From TE Inventory to Player Inventory
                if (!this.mergeItemStack(current, 2, 38, true)) {
                    return null;
                }
            } else {
                // From Player Inventory to TE Inventory
                if (!this.mergeItemStack(current, 0, 1, false)) {
                    return null;
                }
            }


            if (current.isEmpty()) {
                slot.putStack(ItemStack.EMPTY);
            } else {
                slot.onSlotChanged();
            }
        }

        return previous;
    }

    @Override
    public boolean canInteractWith(EntityPlayer playerIn) {
        return this.tileEntity.isUsableByPlayer(playerIn);
    }
}