ContainerGun.java

package com.lionzxy.mysticalislands.gun;

import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.entity.player.InventoryPlayer;
import net.minecraft.init.Blocks;
import net.minecraft.init.Items;
import net.minecraft.inventory.Container;
import net.minecraft.inventory.Slot;
import net.minecraft.item.ItemStack;

/**
 * Created by lionzxy on 16.07.15.
 */
public class ContainerGun extends Container{
    private static final int
            /*Наш инвентарь идет так:
                     36 37 38
            9  10 11 12 13 14 15 16 17
            18 19 20 21 22 23 24 25 26
            27 28 29 30 31 32 33 34 35
            __________________________
            0  1  2  3  4  5  6  7  8
            */
            INV_START = InventoryGun.INV_SIZE,
            INV_END = INV_START + 26,
            HOTBAR_START = INV_END + 1,
            HOTBAR_END = HOTBAR_START + 8;


    public ContainerGun(EntityPlayer player){

        //Add inventory slot
        for (int i = 1; i < 4; ++i) {
            for (int j = 0; j < 9; ++j) {
                this.addSlotToContainer(new Slot(player.inventory, j + i * 9+9, 9 + j * 18, 60 + i * 18));
            }
        }
        //Add Hotbar slots
        for (int i = 0; i < 9; ++i) {
            this.addSlotToContainer(new Slot(player.inventory, i, 9 + i * 18, 136));
        }       
         //Add slots for gun
        for(int i=0;i<3;i++){
            this.addSlotToContainer(new Slot(new InventoryGun(new ItemStack(Items.carrot)),i,81+i*18,29));
        }
        

    }
    @Override
    public boolean canInteractWith(EntityPlayer player) {
        return player.inventory.isUseableByPlayer(player);
    }

    public ItemStack transferStackInSlot(EntityPlayer player, int numSlot) {
        ItemStack itemstack = null;
        Slot slot =(Slot) this.inventorySlots.get(numSlot);
        System.out.println(numSlot);
        if (slot != null && slot.getHasStack()) {
            ItemStack itemstack1 = slot.getStack();
            itemstack = itemstack1.copy();

            if (numSlot <INV_START) {
                //Move item from gun inventory to inventory
                if (!this.mergeItemStack(itemstack1, INV_START, HOTBAR_END + 1, true)) {
                    return null;
                }

                slot.onSlotChange(itemstack1, itemstack);
            } else {
                if (numSlot >= INV_START && numSlot <= INV_END) {
                                        /* Item in Player Inventory, move to the gun inventory */
                    System.out.println("Item in Player Inventory, move to the gun inventory ");
                    if (!this.mergeItemStack(itemstack1, 0, 2, false)) {
                        return null;
                    }
                }
                                /* Item in the Hot Bar, move it to Player Inventory */
                else if (numSlot >= HOTBAR_START && numSlot <= HOTBAR_END) {
                    System.out.println("Item in the Hot Bar, move it to Player Inventory ");
                    if (!this.mergeItemStack(itemstack1, INV_START, INV_END + 1, false)) {
                        return null;
                    }
                }
            }

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

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

            slot.onPickupFromSlot(player, itemstack1);
        }
        return itemstack;
    }
    /*@Override
    public ItemStack slotClick(int slot, int button, int flag, EntityPlayer player) {
        // This will prevent the player from interacting with the item that opened the inventory:
        if (slot >= 0 && getSlot(slot) != null && getSlot(slot).getStack() == player.getHeldItem()) {
            return null;
        }
        return super.slotClick(slot, button, flag, player);}*/
}