Chisel/src/main/java/team/chisel/inventory/ContainerChisel.java

package team.chisel.inventory;

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

import team.chisel.carving.Carving;
import team.chisel.item.chisel.ItemChisel;
import team.chisel.utils.General;

import com.cricketcraft.chisel.api.carving.ICarvingRegistry;

public class ContainerChisel extends Container {

    public final InventoryChiselSelection inventory;
    public InventoryPlayer playerInventory;
    int chiselSlot;
    public ItemStack chisel;
    public boolean finished;
    public ICarvingRegistry carving;

    public ContainerChisel(InventoryPlayer inventoryplayer, InventoryChiselSelection inv) {
        inventory = inv;
        playerInventory = inventoryplayer;
        chiselSlot = playerInventory.currentItem;
        inv.container = this;

        int top = 8, left = 62;

        // selection slots
        for (int i = 0; i < InventoryChiselSelection.normalSlots; i++) {
            addSlotToContainer(
                    new SlotChiselSelection(
                            this,
                            inventory,
                            inventory,
                            i,
                            left + ((i % 10) * 18),
                            top + ((i / 10) * 18)));
        }

        // main slot
        addSlotToContainer(new SlotChiselInput(this, inventory, InventoryChiselSelection.normalSlots, 24, 24));

        top += 112;
        left += 9;
        // main inv
        for (int i = 0; i < 27; i++) {
            addSlotToContainer(new Slot(inventoryplayer, i + 9, left + ((i % 9) * 18), top + (i / 9) * 18));
        }

        top += 58;
        for (int i = 0; i < 9; i++) {
            addSlotToContainer(new Slot(inventoryplayer, i, left + ((i % 9) * 18), top + (i / 9) * 18));
        }

        chisel = inventoryplayer.getCurrentItem();
        if (chisel != null && chisel.stackTagCompound != null) {
            ItemStack stack = ItemStack.loadItemStackFromNBT(chisel.stackTagCompound.getCompoundTag("chiselTarget"));
            inventory.setInventorySlotContents(InventoryChiselSelection.normalSlots, stack);
        }

        Item item = General.getItem(chisel);
        carving = item instanceof ItemChisel ? ItemChisel.carving : Carving.chisel;

        inventory.updateItems();
    }

    @Override
    public ItemStack slotClick(int par1, int par2, int par3, EntityPlayer par4EntityPlayer) {
        // we need to subtract away all the other slots
        int clickedSlot = par1 - inventory.getSizeInventory() - 27;

        // if the player has clicked on the chisel or is trying to use a number key to force an itemstack into the slot
        // the chisel is in
        if (clickedSlot == chiselSlot || (par3 == 2 && par2 == chiselSlot)) return null;

        return super.slotClick(par1, par2, par3, par4EntityPlayer);
    }

    @Override
    public void onContainerClosed(EntityPlayer entityplayer) {
        inventory.clearItems();
        super.onContainerClosed(entityplayer);
    }

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

    @Override
    public ItemStack transferStackInSlot(EntityPlayer entity, int slotIdx) {
        ItemStack itemstack = null;
        Slot slot = (Slot) this.inventorySlots.get(slotIdx);

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

            if (slotIdx > InventoryChiselSelection.normalSlots) {
                if (!this.mergeItemStack(
                        itemstack1,
                        InventoryChiselSelection.normalSlots,
                        InventoryChiselSelection.normalSlots + 1,
                        false)) {
                    return null;
                }
            } else {
                entity.inventory.setItemStack(itemstack1.copy());
                slot.onPickupFromSlot(entity, itemstack1);
                itemstack1 = entity.inventory.getItemStack();
                entity.inventory.setItemStack(null);

                if (!this.mergeItemStack(
                        itemstack1,
                        InventoryChiselSelection.normalSlots + 1,
                        InventoryChiselSelection.normalSlots + 1 + 36,
                        false)) {
                    entity.inventory.setItemStack(itemstack1);
                    return null;
                }
            }
            slot.onSlotChange(itemstack1, itemstack);

            if (itemstack1.stackSize == 0) {
                slot.putStack(null);
            } else {
                slot.putStack(itemstack1);
                slot.onSlotChanged();
            }
            if (itemstack1.stackSize == itemstack.stackSize) {
                return null;
            }
            if (slotIdx >= InventoryChiselSelection.normalSlots) {
                slot.onPickupFromSlot(entity, itemstack1);
            }
            if (itemstack1.stackSize == 0) {
                slot.putStack(null);
                return null;
            }
        }
        return itemstack;
    }

    /**
     * Added validation of slot input Only Chiselable allowed
     *
     * @author Léa Gris
     */
    @Override
    protected boolean mergeItemStack(ItemStack par1ItemStack, int fromIndex, int toIndex, boolean reversOrder) {
        return ((Slot) this.inventorySlots.get(reversOrder ? toIndex - 1 : fromIndex)).isItemValid(par1ItemStack)
                && super.mergeItemStack(par1ItemStack, fromIndex, toIndex, reversOrder);
    }

    public void onChiselSlotChanged() {
        ItemStack stack = playerInventory.mainInventory[chiselSlot];
        if (stack == null || !stack.isItemEqual(chisel)) finished = true;

        if (finished) return;

        General.setChiselTarget(chisel, inventory.getStackInSpecialSlot());

        playerInventory.mainInventory[chiselSlot] = chisel;
    }
}