ContainerPestle.java

package com.modmcdl.magitech.gui;

import com.modmcdl.magitech.recipe.PestleRecipe;
import com.modmcdl.magitech.slot.SlotPestleOutput;
import com.modmcdl.magitech.tileenitity.TileEntityPestle;

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

public class ContainerPestle extends Container{

    private final TileEntityPestle tileentity;

    ContainerPestle(InventoryPlayer player, TileEntityPestle tileentity) {
        this.tileentity = tileentity;
        this.addSlotToContainer(new Slot(tileentity, 0, 31, 24));
        this.addSlotToContainer(new Slot(tileentity, 1, 66, 43));
        this.addSlotToContainer(new SlotPestleOutput(player.player, tileentity, 3, 119, 30));

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

        for(int x = 0; x < 9; ++x) //Hotbar
            this.addSlotToContainer(new Slot(player, x, 8 + x * 18, 142 ));

    }

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

    @Override
    public ItemStack transferStackInSlot(EntityPlayer playerIn, int index) {
        ItemStack stack = ItemStack.EMPTY;
        Slot slot = (Slot)this.inventorySlots.get(index);

        if(slot != null && slot.getHasStack()) {
            ItemStack stack1 = slot.getStack();
            stack = stack1.copy();

            if(index == 3) {
                if(!this.mergeItemStack(stack1, 4, 40, true))
                    return ItemStack.EMPTY;
                slot.onSlotChange(stack1, stack);
            }
            else if(index != 2 && index != 1 && index != 0 ) {
                Slot slot1 = (Slot)this.inventorySlots.get(index + 1);

                if(!PestleRecipe.instance().getPestleResult(stack1, slot1.getStack()).isEmpty())
                    if(!this.mergeItemStack(stack1, 0, 2, false))
                        return ItemStack.EMPTY;
                    else if(index >= 4 && index < 31)
                        if(!this.mergeItemStack(stack1, 31, 40, false))
                            return ItemStack.EMPTY;
                        else if(index > 31 && index < 40 && !this.mergeItemStack(stack1, 4, 31, false))
                            return ItemStack.EMPTY;
                }
                else if(!this.mergeItemStack(stack1, 4, 40, false))
                        return ItemStack.EMPTY;
            if(stack1.isEmpty())
                slot.putStack(ItemStack.EMPTY);
            else
                slot.onSlotChanged();
            if(stack1.getCount() == stack.getCount())
                return ItemStack.EMPTY;
            slot.onTake(playerIn, stack1);
        }
        return stack;

    }

}