Item Pickup Event, take from container event?

[strumshot]

I am working on a mod in which my current challenge is to interrupt a player removing a certain item from a chest. The item I would be interrupting is an original item, and the chest itself is also custom. These portion are complete and work properly. My guess is that I may be trying to hook an item interaction event or container/inventory interaction event. Can someone point me in the right direction? After sifting through the base code and GitHub refernces, I am still scratching my head on where to start with this one... If it helps, the classes that I have already overridden for my custom chest are the BlockChest and TileEntityChest classes. I don't believe any of the code I already have will serve to help answer the question, but let me know if I need to post any! Thanks!

[strumshot]

O.K., I follow you so far, but TileEntityChest, BlockChest, and IInventory all seem to reference 'slots' only via an int[] with an ItemStack. What file/class am I missing that impliments a Slot class? Or am I going rogue on this one and writing entirely new methods to handle the ItemStacks; one that we are referring to as a "slot?"

[strumshot]

Alright, hopefully this is the last question I need to get the ball rolling, but I found this in EntityPlayer:

 

public Container openContainer;

 

and this line in TileEntityChest:

 

if (entityplayer.openContainer instanceof ContainerChest)

 

I have no problems locating the Slot class here and the methods are indeed clear, but I can't seem to find any references or connections to the actual Container class through the chest itself... Surely it has to be referenced somewhere else... I'm beginning to think perhaps this is out of my scope or that I'm overlooking an obvious connection. You've been very helpful already, here's to once more!

[strumshot]

Yes, and I am ready to do that, for sure. But there are no fields, methods, or the like for me to replace; at least that I can find. So I guess clarifying the question is how does the BlockChest/TileEntityChest/IInventory chain implement the Container class? I can write a new one, but how will my custom chest know to use it instead of the base class? For complete clarity I will share my classes so far...

 

overridden BlockChest

 

package com.KOTR.IShop;

import static net.minecraftforge.common.util.ForgeDirection.DOWN;

import java.util.Iterator;
import java.util.Random;

import cpw.mods.fml.relauncher.Side;
import cpw.mods.fml.relauncher.SideOnly;
import net.minecraft.block.Block;
import net.minecraft.block.BlockChest;
import net.minecraft.block.BlockContainer;
import net.minecraft.block.material.Material;
import net.minecraft.client.renderer.texture.IIconRegister;
import net.minecraft.creativetab.CreativeTabs;
import net.minecraft.entity.Entity;
import net.minecraft.entity.EntityLivingBase;
import net.minecraft.entity.item.EntityItem;
import net.minecraft.entity.passive.EntityOcelot;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.inventory.Container;
import net.minecraft.inventory.ContainerChest;
import net.minecraft.inventory.IInventory;
import net.minecraft.inventory.InventoryLargeChest;
import net.minecraft.item.Item;
import net.minecraft.item.ItemStack;
import net.minecraft.nbt.NBTTagCompound;
import net.minecraft.tileentity.TileEntity;
import net.minecraft.util.AxisAlignedBB;
import net.minecraft.util.MathHelper;
import net.minecraft.world.IBlockAccess;
import net.minecraft.world.World;

public class ShopChest extends BlockChest {


private final Random field_149955_b = new Random();
    
protected ShopChest(int p_i45397_1_) {
	super(0);	


}

public void onBlockPlacedBy(World p_149689_1_, int p_149689_2_, int p_149689_3_, int p_149689_4_, EntityLivingBase p_149689_5_, ItemStack p_149689_6_)
    {
        Block block = p_149689_1_.getBlock(p_149689_2_, p_149689_3_, p_149689_4_ - 1);
        Block block1 = p_149689_1_.getBlock(p_149689_2_, p_149689_3_, p_149689_4_ + 1);
        Block block2 = p_149689_1_.getBlock(p_149689_2_ - 1, p_149689_3_, p_149689_4_);
        Block block3 = p_149689_1_.getBlock(p_149689_2_ + 1, p_149689_3_, p_149689_4_);
        byte b0 = 0;
        int l = MathHelper.floor_double((double)(p_149689_5_.rotationYaw * 4.0F / 360.0F) + 0.5D) & 3;

        if (l == 0)
        {
            b0 = 2;
        }

        if (l == 1)
        {
            b0 = 5;
        }

        if (l == 2)
        {
            b0 = 3;
        }

        if (l == 3)
        {
            b0 = 4;
        }

        if (block != this && block1 != this && block2 != this && block3 != this)
        {
            p_149689_1_.setBlockMetadataWithNotify(p_149689_2_, p_149689_3_, p_149689_4_, b0, 3);
        }
        else
        {
            if ((block == this || block1 == this) && (b0 == 4 || b0 == 5))
            {
                if (block == this)
                {
                    p_149689_1_.setBlockMetadataWithNotify(p_149689_2_, p_149689_3_, p_149689_4_ - 1, b0, 3);
                }
                else
                {
                    p_149689_1_.setBlockMetadataWithNotify(p_149689_2_, p_149689_3_, p_149689_4_ + 1, b0, 3);
                }

                p_149689_1_.setBlockMetadataWithNotify(p_149689_2_, p_149689_3_, p_149689_4_, b0, 3);
            }

            if ((block2 == this || block3 == this) && (b0 == 2 || b0 == 3))
            {
                if (block2 == this)
                {
                    p_149689_1_.setBlockMetadataWithNotify(p_149689_2_ - 1, p_149689_3_, p_149689_4_, b0, 3);
                }
                else
                {
                    p_149689_1_.setBlockMetadataWithNotify(p_149689_2_ + 1, p_149689_3_, p_149689_4_, b0, 3);
                }

                p_149689_1_.setBlockMetadataWithNotify(p_149689_2_, p_149689_3_, p_149689_4_, b0, 3);
            }
        }

        if (p_149689_6_.hasDisplayName())
        {
            ((TileEntityShopChest)p_149689_1_.getTileEntity(p_149689_2_, p_149689_3_, p_149689_4_)).func_145976_a(p_149689_6_.getDisplayName());
        }
    }

/**
     * Lets the block know when one of its neighbor changes. Doesn't know which neighbor changed (coordinates passed are
     * their own) Args: x, y, z, neighbor Block
     */
    public void onNeighborBlockChange(World p_149695_1_, int p_149695_2_, int p_149695_3_, int p_149695_4_, Block p_149695_5_)
    {
        super.onNeighborBlockChange(p_149695_1_, p_149695_2_, p_149695_3_, p_149695_4_, p_149695_5_);
        TileEntityShopChest tileentitychest = (TileEntityShopChest)p_149695_1_.getTileEntity(p_149695_2_, p_149695_3_, p_149695_4_);

        if (tileentitychest != null)
        {
            tileentitychest.updateContainingBlockInfo();
        }
    }

    public void breakBlock(World p_149749_1_, int p_149749_2_, int p_149749_3_, int p_149749_4_, Block p_149749_5_, int p_149749_6_)
    {
        TileEntityShopChest tileentitychest = (TileEntityShopChest)p_149749_1_.getTileEntity(p_149749_2_, p_149749_3_, p_149749_4_);

        if (tileentitychest != null)
        {
            for (int i1 = 0; i1 < tileentitychest.getSizeInventory(); ++i1)
            {
                ItemStack itemstack = tileentitychest.getStackInSlot(i1);

                if (itemstack != null)
                {
                    float f = this.field_149955_b.nextFloat() * 0.8F + 0.1F;
                    float f1 = this.field_149955_b.nextFloat() * 0.8F + 0.1F;
                    EntityItem entityitem;

                    for (float f2 = this.field_149955_b.nextFloat() * 0.8F + 0.1F; itemstack.stackSize > 0; p_149749_1_.spawnEntityInWorld(entityitem))
                    {
                        int j1 = this.field_149955_b.nextInt(21) + 10;

                        if (j1 > itemstack.stackSize)
                        {
                            j1 = itemstack.stackSize;
                        }

                        itemstack.stackSize -= j1;
                        entityitem = new EntityItem(p_149749_1_, (double)((float)p_149749_2_ + f), (double)((float)p_149749_3_ + f1), (double)((float)p_149749_4_ + f2), new ItemStack(itemstack.getItem(), j1, itemstack.getItemDamage()));
                        float f3 = 0.05F;
                        entityitem.motionX = (double)((float)this.field_149955_b.nextGaussian() * f3);
                        entityitem.motionY = (double)((float)this.field_149955_b.nextGaussian() * f3 + 0.2F);
                        entityitem.motionZ = (double)((float)this.field_149955_b.nextGaussian() * f3);

                        if (itemstack.hasTagCompound())
                        {
                            entityitem.getEntityItem().setTagCompound((NBTTagCompound)itemstack.getTagCompound().copy());
                        }
                    }
                }
            }

            p_149749_1_.func_147453_f(p_149749_2_, p_149749_3_, p_149749_4_, p_149749_5_);
        }

        super.breakBlock(p_149749_1_, p_149749_2_, p_149749_3_, p_149749_4_, p_149749_5_, p_149749_6_);
    }

    public IInventory func_149951_m(World p_149951_1_, int p_149951_2_, int p_149951_3_, int p_149951_4_)
    {
        Object object = (TileEntityShopChest)p_149951_1_.getTileEntity(p_149951_2_, p_149951_3_, p_149951_4_);

        if (object == null)
        {
            return null;
        }
        else if (p_149951_1_.isSideSolid(p_149951_2_, p_149951_3_ + 1, p_149951_4_, DOWN))
        {
            return null;
        }
        else if (func_149953_o(p_149951_1_, p_149951_2_, p_149951_3_, p_149951_4_))
        {
            return null;
        }
        else if (p_149951_1_.getBlock(p_149951_2_ - 1, p_149951_3_, p_149951_4_) == this && (p_149951_1_.isSideSolid(p_149951_2_ - 1, p_149951_3_ + 1, p_149951_4_, DOWN) || func_149953_o(p_149951_1_, p_149951_2_ - 1, p_149951_3_, p_149951_4_)))
        {
            return null;
        }
        else if (p_149951_1_.getBlock(p_149951_2_ + 1, p_149951_3_, p_149951_4_) == this && (p_149951_1_.isSideSolid(p_149951_2_ + 1, p_149951_3_ + 1, p_149951_4_, DOWN) || func_149953_o(p_149951_1_, p_149951_2_ + 1, p_149951_3_, p_149951_4_)))
        {
            return null;
        }
        else if (p_149951_1_.getBlock(p_149951_2_, p_149951_3_, p_149951_4_ - 1) == this && (p_149951_1_.isSideSolid(p_149951_2_, p_149951_3_ + 1, p_149951_4_ - 1, DOWN) || func_149953_o(p_149951_1_, p_149951_2_, p_149951_3_, p_149951_4_ - 1)))
        {
            return null;
        }
        else if (p_149951_1_.getBlock(p_149951_2_, p_149951_3_, p_149951_4_ + 1) == this && (p_149951_1_.isSideSolid(p_149951_2_, p_149951_3_ + 1, p_149951_4_ + 1, DOWN) || func_149953_o(p_149951_1_, p_149951_2_, p_149951_3_, p_149951_4_ + 1)))
        {
            return null;
        }
        else
        {
            if (p_149951_1_.getBlock(p_149951_2_ - 1, p_149951_3_, p_149951_4_) == this)
            {
                object = new InventoryLargeChest("Shop Chest", (TileEntityShopChest)p_149951_1_.getTileEntity(p_149951_2_ - 1, p_149951_3_, p_149951_4_), (IInventory)object);
            }

            if (p_149951_1_.getBlock(p_149951_2_ + 1, p_149951_3_, p_149951_4_) == this)
            {
                object = new InventoryLargeChest("Shop Chest", (IInventory)object, (TileEntityShopChest)p_149951_1_.getTileEntity(p_149951_2_ + 1, p_149951_3_, p_149951_4_));
            }

            if (p_149951_1_.getBlock(p_149951_2_, p_149951_3_, p_149951_4_ - 1) == this)
            {
                object = new InventoryLargeChest("Shop Chest", (TileEntityShopChest)p_149951_1_.getTileEntity(p_149951_2_, p_149951_3_, p_149951_4_ - 1), (IInventory)object);
            }

            if (p_149951_1_.getBlock(p_149951_2_, p_149951_3_, p_149951_4_ + 1) == this)
            {
                object = new InventoryLargeChest("Shop Chest", (IInventory)object, (TileEntityShopChest)p_149951_1_.getTileEntity(p_149951_2_, p_149951_3_, p_149951_4_ + 1));
            }

            return (IInventory)object;
        }
    }
    
    public TileEntity createNewTileEntity(World p_149915_1_, int p_149915_2_)
    {
        TileEntityShopChest tileentitychest = new TileEntityShopChest();
        return tileentitychest;
    }
    
    public int isProvidingWeakPower(IBlockAccess p_149709_1_, int p_149709_2_, int p_149709_3_, int p_149709_4_, int p_149709_5_)
    {
        if (!this.canProvidePower())
        {
            return 0;
        }
        else
        {
            int i1 = ((TileEntityShopChest)p_149709_1_.getTileEntity(p_149709_2_, p_149709_3_, p_149709_4_)).numPlayersUsing;
            return MathHelper.clamp_int(i1, 0, 15);
        }
    }
    
    private static boolean func_149953_o(World p_149953_0_, int p_149953_1_, int p_149953_2_, int p_149953_3_)
    {
        Iterator iterator = p_149953_0_.getEntitiesWithinAABB(EntityOcelot.class, AxisAlignedBB.getBoundingBox((double)p_149953_1_, (double)(p_149953_2_ + 1), (double)p_149953_3_, (double)(p_149953_1_ + 1), (double)(p_149953_2_ + 2), (double)(p_149953_3_ + 1))).iterator();
        EntityOcelot entityocelot;

        do
        {
            if (!iterator.hasNext())
            {
                return false;
            }

            Entity entity = (Entity)iterator.next();
            entityocelot = (EntityOcelot)entity;
        }
        while (!entityocelot.isSitting());

        return true;
    }
    
    /**
     * Checks to see if its valid to put this block at the specified coordinates. Args: world, x, y, z
     */
    public boolean canPlaceBlockAt(World p_149742_1_, int p_149742_2_, int p_149742_3_, int p_149742_4_)
    {
        int l = 0;

        if (p_149742_1_.getBlock(p_149742_2_ - 1, p_149742_3_, p_149742_4_) == this)
        {
            ++l;
        }

        if (p_149742_1_.getBlock(p_149742_2_ + 1, p_149742_3_, p_149742_4_) == this)
        {
            ++l;
        }

        if (p_149742_1_.getBlock(p_149742_2_, p_149742_3_, p_149742_4_ - 1) == this)
        {
            ++l;
        }

        if (p_149742_1_.getBlock(p_149742_2_, p_149742_3_, p_149742_4_ + 1) == this)
        {
            ++l;
        }

        return l > 0 ? false : (this.func_149952_n(p_149742_1_, p_149742_2_ - 1, p_149742_3_, p_149742_4_) ? false : (this.func_149952_n(p_149742_1_, p_149742_2_ + 1, p_149742_3_, p_149742_4_) ? false : (this.func_149952_n(p_149742_1_, p_149742_2_, p_149742_3_, p_149742_4_ - 1) ? false : !this.func_149952_n(p_149742_1_, p_149742_2_, p_149742_3_, p_149742_4_ + 1))));
    }
    
    private boolean func_149952_n(World p_149952_1_, int p_149952_2_, int p_149952_3_, int p_149952_4_)
    {
        return p_149952_1_.getBlock(p_149952_2_, p_149952_3_, p_149952_4_) != this ? false : (p_149952_1_.getBlock(p_149952_2_ - 1, p_149952_3_, p_149952_4_) == this ? true : (p_149952_1_.getBlock(p_149952_2_ + 1, p_149952_3_, p_149952_4_) == this ? true : (p_149952_1_.getBlock(p_149952_2_, p_149952_3_, p_149952_4_ - 1) == this ? true : p_149952_1_.getBlock(p_149952_2_, p_149952_3_, p_149952_4_ + 1) == this)));
    }
        
    @SideOnly(Side.CLIENT)
    public void registerBlockIcons(IIconRegister p_149651_1_)
    {
        this.blockIcon = p_149651_1_.registerIcon("planks_oak");
    }

}

 

 

Overridden TileEntityChest

 

package com.KOTR.IShop;

import cpw.mods.fml.relauncher.Side;
import cpw.mods.fml.relauncher.SideOnly;
import net.minecraft.block.Block;
import net.minecraft.block.BlockChest;
import net.minecraft.item.ItemStack;
import net.minecraft.nbt.NBTTagCompound;
import net.minecraft.nbt.NBTTagList;
import net.minecraft.tileentity.TileEntityChest;

public class TileEntityShopChest extends TileEntityChest{

private ItemStack[] chestContents = new ItemStack[36];
/** Contains the chest tile located adjacent to this one (if any) */
    public TileEntityShopChest adjacentChestZNeg;
    /** Contains the chest tile located adjacent to this one (if any) */
    public TileEntityShopChest adjacentChestXPos;
    /** Contains the chest tile located adjacent to this one (if any) */
    public TileEntityShopChest adjacentChestXNeg;
    /** Contains the chest tile located adjacent to this one (if any) */
    public TileEntityShopChest adjacentChestZPos;
    private int cachedChestType;
    private String customName;
    
    public TileEntityShopChest()
    {
        this.cachedChestType = -1;
    }

    @SideOnly(Side.CLIENT)
    public TileEntityShopChest(int p_i2350_1_)
    {
        this.cachedChestType = p_i2350_1_;
    }
    
    /**
     * Returns the name of the inventory
     */
    public String getInventoryName()
    {
        return this.hasCustomInventoryName() ? this.customName : "Shop Chest";
    }
    
    public void readFromNBT(NBTTagCompound p_145839_1_)
    {
        super.readFromNBT(p_145839_1_);
        NBTTagList nbttaglist = p_145839_1_.getTagList("Items", 10);
        this.chestContents = new ItemStack[this.getSizeInventory()];

        if (p_145839_1_.hasKey("CustomName", )
        {
            this.customName = p_145839_1_.getString("CustomName");
        }

        for (int i = 0; i < nbttaglist.tagCount(); ++i)
        {
            NBTTagCompound nbttagcompound1 = nbttaglist.getCompoundTagAt(i);
            int j = nbttagcompound1.getByte("Slot") & 255;

            if (j >= 0 && j < this.chestContents.length)
            {
                this.chestContents[j] = ItemStack.loadItemStackFromNBT(nbttagcompound1);
            }
        }
    }

    public void writeToNBT(NBTTagCompound p_145841_1_)
    {
        super.writeToNBT(p_145841_1_);
        NBTTagList nbttaglist = new NBTTagList();

        for (int i = 0; i < this.chestContents.length; ++i)
        {
            if (this.chestContents[i] != null)
            {
                NBTTagCompound nbttagcompound1 = new NBTTagCompound();
                nbttagcompound1.setByte("Slot", (byte)i);
                this.chestContents[i].writeToNBT(nbttagcompound1);
                nbttaglist.appendTag(nbttagcompound1);
            }
        }

        p_145841_1_.setTag("Items", nbttaglist);

        if (this.hasCustomInventoryName())
        {
            p_145841_1_.setString("CustomName", this.customName);
        }
    }
    
    
    /**
     * Performs the check for adjacent chests to determine if this chest is double or not.
     */
    public void checkForAdjacentChests()
    {
        if (!this.adjacentChestChecked)
        {
            this.adjacentChestChecked = true;
            this.adjacentChestZNeg = null;
            this.adjacentChestXPos = null;
            this.adjacentChestXNeg = null;
            this.adjacentChestZPos = null;

            if (this.func_145977_a(this.xCoord - 1, this.yCoord, this.zCoord))
            {
                this.adjacentChestXNeg = (TileEntityShopChest)this.worldObj.getTileEntity(this.xCoord - 1, this.yCoord, this.zCoord);
            }

            if (this.func_145977_a(this.xCoord + 1, this.yCoord, this.zCoord))
            {
                this.adjacentChestXPos = (TileEntityShopChest)this.worldObj.getTileEntity(this.xCoord + 1, this.yCoord, this.zCoord);
            }

            if (this.func_145977_a(this.xCoord, this.yCoord, this.zCoord - 1))
            {
                this.adjacentChestZNeg = (TileEntityShopChest)this.worldObj.getTileEntity(this.xCoord, this.yCoord, this.zCoord - 1);
            }

            if (this.func_145977_a(this.xCoord, this.yCoord, this.zCoord + 1))
            {
                this.adjacentChestZPos = (TileEntityShopChest)this.worldObj.getTileEntity(this.xCoord, this.yCoord, this.zCoord + 1);
            }

            if (this.adjacentChestZNeg != null)
            {
                this.adjacentChestZNeg.func_145978_a(this, 0);
            }

            if (this.adjacentChestZPos != null)
            {
                this.adjacentChestZPos.func_145978_a(this, 2);
            }

            if (this.adjacentChestXPos != null)
            {
                this.adjacentChestXPos.func_145978_a(this, 1);
            }

            if (this.adjacentChestXNeg != null)
            {
                this.adjacentChestXNeg.func_145978_a(this, 3);
            }
        }
    }

    private boolean func_145977_a(int p_145977_1_, int p_145977_2_, int p_145977_3_)
    {
        if (this.worldObj == null)
        {
            return false;
        }
        else
        {
            Block block = this.worldObj.getBlock(p_145977_1_, p_145977_2_, p_145977_3_);
            return block instanceof ShopChest && ((ShopChest)block).field_149956_a == this.func_145980_j();
        }
    }
    
    public void closeInventory()
    {
        if (this.getBlockType() instanceof ShopChest)
        {
            --this.numPlayersUsing;
            this.worldObj.addBlockEvent(this.xCoord, this.yCoord, this.zCoord, this.getBlockType(), 1, this.numPlayersUsing);
            this.worldObj.notifyBlocksOfNeighborChange(this.xCoord, this.yCoord, this.zCoord, this.getBlockType());
            this.worldObj.notifyBlocksOfNeighborChange(this.xCoord, this.yCoord - 1, this.zCoord, this.getBlockType());
        }
    }
    
    public int func_145980_j()
    {
        if (this.cachedChestType == -1)
        {
            if (this.worldObj == null || !(this.getBlockType() instanceof ShopChest))
            {
                return 0;
            }

            this.cachedChestType = ((ShopChest)this.getBlockType()).field_149956_a;
        }

        return this.cachedChestType;
    }
    
    private void func_145978_a(TileEntityShopChest p_145978_1_, int p_145978_2_)
    {
        if (p_145978_1_.isInvalid())
        {
            this.adjacentChestChecked = false;
        }
        else if (this.adjacentChestChecked)
        {
            switch (p_145978_2_)
            {
                case 0:
                    if (this.adjacentChestZPos != p_145978_1_)
                    {
                        this.adjacentChestChecked = false;
                    }

                    break;
                case 1:
                    if (this.adjacentChestXNeg != p_145978_1_)
                    {
                        this.adjacentChestChecked = false;
                    }

                    break;
                case 2:
                    if (this.adjacentChestZNeg != p_145978_1_)
                    {
                        this.adjacentChestChecked = false;
                    }

                    break;
                case 3:
                    if (this.adjacentChestXPos != p_145978_1_)
                    {
                        this.adjacentChestChecked = false;
                    }
            }
        }
    }

}

 

 

Thanks again, your expertise truly is appreciated. (/BTC tip?) 

[strumshot]

So the container is accessed through the GUI... That's the missing link; and the very thing I was trying to avoid. Java and coding concepts, I'm fine with; learning an API is the hard part! You can consider this one solved and yourself helpful; I don't care what everyone else says!