ContainerMerchant.java

package net.minecraft.inventory;

import cpw.mods.fml.relauncher.Side;
import cpw.mods.fml.relauncher.SideOnly;
import net.minecraft.entity.IMerchant;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.entity.player.InventoryPlayer;
import net.minecraft.item.ItemStack;
import net.minecraft.world.World;

public class ContainerMerchant extends Container
{
    /** Instance of Merchant. */
    private IMerchant theMerchant;
    private InventoryMerchant merchantInventory;

    /** Instance of World. */
    private final World theWorld;

    public ContainerMerchant(InventoryPlayer par1InventoryPlayer, IMerchant par2IMerchant, World par3World)
    {
        this.theMerchant = par2IMerchant;
        this.theWorld = par3World;
        this.merchantInventory = new InventoryMerchant(par1InventoryPlayer.player, par2IMerchant);
        this.addSlotToContainer(new Slot(this.merchantInventory, 0, 36, 53));
        this.addSlotToContainer(new Slot(this.merchantInventory, 1, 62, 53));
        this.addSlotToContainer(new SlotMerchantResult(par1InventoryPlayer.player, par2IMerchant, this.merchantInventory, 2, 120, 53));
        int i;

        for (i = 0; i < 3; ++i)
        {
            for (int j = 0; j < 9; ++j)
            {
                this.addSlotToContainer(new Slot(par1InventoryPlayer, j + i * 9 + 9, 8 + j * 18, 84 + i * 18));
            }
        }

        for (i = 0; i < 9; ++i)
        {
            this.addSlotToContainer(new Slot(par1InventoryPlayer, i, 8 + i * 18, 142));
        }
    }

    public InventoryMerchant getMerchantInventory()
    {
        return this.merchantInventory;
    }

    public void addCraftingToCrafters(ICrafting par1ICrafting)
    {
        super.addCraftingToCrafters(par1ICrafting);
    }

    /**
     * Looks for changes made in the container, sends them to every listener.
     */
    public void detectAndSendChanges()
    {
        super.detectAndSendChanges();
    }

    /**
     * Callback for when the crafting matrix is changed.
     */
    public void onCraftMatrixChanged(IInventory par1IInventory)
    {
        this.merchantInventory.resetRecipeAndSlots();
        super.onCraftMatrixChanged(par1IInventory);
    }

    public void setCurrentRecipeIndex(int par1)
    {
        this.merchantInventory.setCurrentRecipeIndex(par1);
    }

    @SideOnly(Side.CLIENT)
    public void updateProgressBar(int par1, int par2) {}

    public boolean canInteractWith(EntityPlayer par1EntityPlayer)
    {
        return this.theMerchant.getCustomer() == par1EntityPlayer;
    }

    /**
     * Called when a player shift-clicks on a slot. You must override this or you will crash when someone does that.
     */
    public ItemStack transferStackInSlot(EntityPlayer par1EntityPlayer, int par2)
    {
        ItemStack itemstack = null;
        Slot slot = (Slot)this.inventorySlots.get(par2);

        if (slot != null && slot.getHasStack())
        {
            ItemStack itemstack1 = slot.getStack();
            itemstack = itemstack1.copy();

            if (par2 == 2)
            {
                if (!this.mergeItemStack(itemstack1, 3, 39, true))
                {
                    return null;
                }

                slot.onSlotChange(itemstack1, itemstack);
            }
            else if (par2 != 0 && par2 != 1)
            {
                if (par2 >= 3 && par2 < 30)
                {
                    if (!this.mergeItemStack(itemstack1, 30, 39, false))
                    {
                        return null;
                    }
                }
                else if (par2 >= 30 && par2 < 39 && !this.mergeItemStack(itemstack1, 3, 30, false))
                {
                    return null;
                }
            }
            else if (!this.mergeItemStack(itemstack1, 3, 39, false))
            {
                return null;
            }

            if (itemstack1.stackSize == 0)
            {
                slot.putStack((ItemStack)null);
            }
            else
            {
                slot.onSlotChanged();
            }

            if (itemstack1.stackSize == itemstack.stackSize)
            {
                return null;
            }

            slot.onPickupFromSlot(par1EntityPlayer, itemstack1);
        }

        return itemstack;
    }

    /**
     * Callback for when the crafting gui is closed.
     */
    public void onCraftGuiClosed(EntityPlayer par1EntityPlayer)
    {
        super.onCraftGuiClosed(par1EntityPlayer);
        this.theMerchant.setCustomer((EntityPlayer)null);
        super.onCraftGuiClosed(par1EntityPlayer);

        if (!this.theWorld.isRemote)
        {
            ItemStack itemstack = this.merchantInventory.getStackInSlotOnClosing(0);

            if (itemstack != null)
            {
                par1EntityPlayer.dropPlayerItem(itemstack);
            }

            itemstack = this.merchantInventory.getStackInSlotOnClosing(1);

            if (itemstack != null)
            {
                par1EntityPlayer.dropPlayerItem(itemstack);
            }
        }
    }
}