Remove on Click Slot

public class MyScreenHandler extends AbstractContainerMenu {
    private final Container container;

    public MyScreenHandler(MenuType<?> menuType, int syncId, Inventory inv) {
        super(menuType, syncId);
        this.container = new SimpleContainer(54); // A simple container with 54 slots (6 rows of 9)

        // Create the item that will be displayed in the locked confirm slot
        ItemStack item = new ItemStack(Items.GREEN_STAINED_GLASS_PANE);
        item.set(DataComponents.CUSTOM_NAME, MessageUtils.getDeserializedText("<gray>Item"));
        item.set(DataComponents.LORE, new ItemLore(List.of(
                MessageUtils.getDeserializedText("<green>Click to remove this item"),
                MessageUtils.getDeserializedText("<green>When the slot is empty,"),
                MessageUtils.getDeserializedText("<green>you can place new items"),
                MessageUtils.getDeserializedText("<green>inside of it without consuming them")
        )));

        // Add the remove on click slot to the container
        for (int i = 0; i < 54; i++) {
            // Used to calculate the x and y position of the slot in the GUI
            int x = SlotUtils.getXPos(i);
            int y = SlotUtils.getYPos(i);

            if (i < 9) { // The first 9 slots (first row)
                container.setItem(i, item);
                /* With the Slots multiple constructors, you can easily configure the sound that is played when the slot is interacted with.
                 * Example:
                 * RemoveOnClickSlot(container, i, x, y) - Plays the default click sound from the SI: Essentials Common Cnfg when clicked
                 * RemoveOnClickSlot(container, i, x, y, false) - Disables the sound when clicked
                 * RemoveOnClickSlot(container, i, x, y, true, SoundType.PRIVATE, SoundSource.MASTER, SoundEvents.LEVER_CLICK, 0.8f, 1.0f) - Plays the lever click sound at volume 0.8 and pitch 1.0 for the player that clicked the slot
                 */
                this.addSlot(new RemoveOnClickSlot(container, i, x, y));
                continue; // Skip the rest of this loop iteration
            }

            // Fill up other slots (will break the GUI if not not all slots are filled up)
            // You could set this to ItemStack.EMPTY
            container.setItem(i, new ItemStack(Items.BLACK_STAINED_GLASS_PANE));
            // The locked slot doesn't allow any interactions with it (Read more about it on its page)
            this.addSlot(new LockedSlot(container, i, x, y));
        }
    }

    // To implement the functionality we want, we also need to override the clicked method:
    @Override
    public void clicked(int slotId, int button, ClickType clickType, Player player) {
        if (slotId >= 0 && slotId < this.slots.size()) {
            Slot slot = this.slots.get(slotId);

            if (slot instanceof RemoveOnClickSlot) {
                ItemStack carried = this.getCarried();

                // Slot has item + cursor empty -> clear
                if (!slot.getItem().isEmpty() && carried.isEmpty()) {
                    slot.set(ItemStack.EMPTY);
                    slot.setChanged();
                    return;
                }

                // Slot empty + cursor has item -> insert 1
                if (slot.getItem().isEmpty() && !carried.isEmpty()) {
                    ItemStack one = carried.copy();
                    one.setCount(1);

                    slot.set(one);
                    slot.setChanged();
                    return;
                }
                return;
            }
        }

        super.clicked(slotId, button, clickType, player);
    }

    // Disallow quick moving items
    @Override
    public ItemStack quickMoveStack(Player player, int i) {
        return ItemStack.EMPTY;
    }

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