Code/net/minecraft/world/inventory/InventoryMenu.java

package net.minecraft.world.inventory;

import java.util.List;
import java.util.Map;
import net.minecraft.resources.ResourceLocation;
import net.minecraft.server.level.ServerLevel;
import net.minecraft.world.Container;
import net.minecraft.world.entity.EquipmentSlot;
import net.minecraft.world.entity.player.Inventory;
import net.minecraft.world.entity.player.Player;
import net.minecraft.world.item.ItemStack;

public class InventoryMenu extends AbstractCraftingMenu {
    public static final int CONTAINER_ID = 0;
    public static final int RESULT_SLOT = 0;
    private static final int CRAFTING_GRID_WIDTH = 2;
    private static final int CRAFTING_GRID_HEIGHT = 2;
    public static final int CRAFT_SLOT_START = 1;
    public static final int CRAFT_SLOT_COUNT = 4;
    public static final int CRAFT_SLOT_END = 5;
    public static final int ARMOR_SLOT_START = 5;
    public static final int ARMOR_SLOT_COUNT = 4;
    public static final int ARMOR_SLOT_END = 9;
    public static final int INV_SLOT_START = 9;
    public static final int INV_SLOT_END = 36;
    public static final int USE_ROW_SLOT_START = 36;
    public static final int USE_ROW_SLOT_END = 45;
    public static final int SHIELD_SLOT = 45;
    public static final ResourceLocation EMPTY_ARMOR_SLOT_HELMET = ResourceLocation.withDefaultNamespace("container/slot/helmet");
    public static final ResourceLocation EMPTY_ARMOR_SLOT_CHESTPLATE = ResourceLocation.withDefaultNamespace("container/slot/chestplate");
    public static final ResourceLocation EMPTY_ARMOR_SLOT_LEGGINGS = ResourceLocation.withDefaultNamespace("container/slot/leggings");
    public static final ResourceLocation EMPTY_ARMOR_SLOT_BOOTS = ResourceLocation.withDefaultNamespace("container/slot/boots");
    public static final ResourceLocation EMPTY_ARMOR_SLOT_SHIELD = ResourceLocation.withDefaultNamespace("container/slot/shield");
    private static final Map<EquipmentSlot, ResourceLocation> TEXTURE_EMPTY_SLOTS = Map.of(
        EquipmentSlot.FEET, EMPTY_ARMOR_SLOT_BOOTS, EquipmentSlot.LEGS, EMPTY_ARMOR_SLOT_LEGGINGS, EquipmentSlot.CHEST, EMPTY_ARMOR_SLOT_CHESTPLATE, EquipmentSlot.HEAD, EMPTY_ARMOR_SLOT_HELMET
    );
    private static final EquipmentSlot[] SLOT_IDS = new EquipmentSlot[]{EquipmentSlot.HEAD, EquipmentSlot.CHEST, EquipmentSlot.LEGS, EquipmentSlot.FEET};
    public final boolean active;
    private final Player owner;

    public InventoryMenu(Inventory p_39706_, boolean p_39707_, final Player p_39708_) {
        super(null, 0, 2, 2);
        this.active = p_39707_;
        this.owner = p_39708_;
        this.addResultSlot(p_39708_, 154, 28);
        this.addCraftingGridSlots(98, 18);

        for (int i = 0; i < 4; i++) {
            EquipmentSlot equipmentslot = SLOT_IDS[i];
            ResourceLocation resourcelocation = TEXTURE_EMPTY_SLOTS.get(equipmentslot);
            this.addSlot(new ArmorSlot(p_39706_, p_39708_, equipmentslot, 39 - i, 8, 8 + i * 18, resourcelocation));
        }

        this.addStandardInventorySlots(p_39706_, 8, 84);
        this.addSlot(new Slot(p_39706_, 40, 77, 62) {
            @Override
            public void setByPlayer(ItemStack p_270969_, ItemStack p_299540_) {
                p_39708_.onEquipItem(EquipmentSlot.OFFHAND, p_299540_, p_270969_);
                super.setByPlayer(p_270969_, p_299540_);
            }

            @Override
            public ResourceLocation getNoItemIcon() {
                return InventoryMenu.EMPTY_ARMOR_SLOT_SHIELD;
            }
        });
    }

    public static boolean isHotbarSlot(int p_150593_) {
        return p_150593_ >= 36 && p_150593_ < 45 || p_150593_ == 45;
    }

    @Override
    public void slotsChanged(Container p_39710_) {
        if (this.owner.level() instanceof ServerLevel serverlevel) {
            CraftingMenu.slotChangedCraftingGrid(this, serverlevel, this.owner, this.craftSlots, this.resultSlots, null);
        }
    }

    @Override
    public void removed(Player p_39721_) {
        super.removed(p_39721_);
        this.resultSlots.clearContent();
        if (!p_39721_.level().isClientSide) {
            this.clearContainer(p_39721_, this.craftSlots);
        }
    }

    @Override
    public boolean stillValid(Player p_39712_) {
        return true;
    }

    @Override
    public ItemStack quickMoveStack(Player p_39723_, int p_39724_) {
        ItemStack itemstack = ItemStack.EMPTY;
        Slot slot = this.slots.get(p_39724_);
        if (slot.hasItem()) {
            ItemStack itemstack1 = slot.getItem();
            itemstack = itemstack1.copy();
            EquipmentSlot equipmentslot = p_39723_.getEquipmentSlotForItem(itemstack);
            if (p_39724_ == 0) {
                if (!this.moveItemStackTo(itemstack1, 9, 45, true)) {
                    return ItemStack.EMPTY;
                }

                slot.onQuickCraft(itemstack1, itemstack);
            } else if (p_39724_ >= 1 && p_39724_ < 5) {
                if (!this.moveItemStackTo(itemstack1, 9, 45, false)) {
                    return ItemStack.EMPTY;
                }
            } else if (p_39724_ >= 5 && p_39724_ < 9) {
                if (!this.moveItemStackTo(itemstack1, 9, 45, false)) {
                    return ItemStack.EMPTY;
                }
            } else if (equipmentslot.getType() == EquipmentSlot.Type.HUMANOID_ARMOR && !this.slots.get(8 - equipmentslot.getIndex()).hasItem()) {
                int i = 8 - equipmentslot.getIndex();
                if (!this.moveItemStackTo(itemstack1, i, i + 1, false)) {
                    return ItemStack.EMPTY;
                }
            } else if (equipmentslot == EquipmentSlot.OFFHAND && !this.slots.get(45).hasItem()) {
                if (!this.moveItemStackTo(itemstack1, 45, 46, false)) {
                    return ItemStack.EMPTY;
                }
            } else if (p_39724_ >= 9 && p_39724_ < 36) {
                if (!this.moveItemStackTo(itemstack1, 36, 45, false)) {
                    return ItemStack.EMPTY;
                }
            } else if (p_39724_ >= 36 && p_39724_ < 45) {
                if (!this.moveItemStackTo(itemstack1, 9, 36, false)) {
                    return ItemStack.EMPTY;
                }
            } else if (!this.moveItemStackTo(itemstack1, 9, 45, false)) {
                return ItemStack.EMPTY;
            }

            if (itemstack1.isEmpty()) {
                slot.setByPlayer(ItemStack.EMPTY, itemstack);
            } else {
                slot.setChanged();
            }

            if (itemstack1.getCount() == itemstack.getCount()) {
                return ItemStack.EMPTY;
            }

            slot.onTake(p_39723_, itemstack1);
            if (p_39724_ == 0) {
                p_39723_.drop(itemstack1, false);
            }
        }

        return itemstack;
    }

    @Override
    public boolean canTakeItemForPickAll(ItemStack p_39716_, Slot p_39717_) {
        return p_39717_.container != this.resultSlots && super.canTakeItemForPickAll(p_39716_, p_39717_);
    }

    @Override
    public Slot getResultSlot() {
        return this.slots.get(0);
    }

    @Override
    public List<Slot> getInputGridSlots() {
        return this.slots.subList(1, 5);
    }

    public CraftingContainer getCraftSlots() {
        return this.craftSlots;
    }

    @Override
    public RecipeBookType getRecipeBookType() {
        return RecipeBookType.CRAFTING;
    }

    @Override
    protected Player owner() {
        return this.owner;
    }
}