public class BackpackContainer extends BaseContainer {

    public BackpackContainer(int synchronizationID, PlayerInventory linkedPlayerInventory) {
        super(synchronizationID, linkedPlayerInventory);

        // inventories
        BasicInventory basicInventory = new BasicInventory(27);
        getInventories().put(PLAYER_INVENTORY, linkedPlayerInventory);
        getInventories().put(1, basicInventory);

        // WInterface
        WInterface mainInterface = new WInterface(WPosition.of(WType.FREE, 0, 0, 0), this);
        getInterfaces().add(mainInterface);

        // tab
        WTabHolder tabHolderA = new WTabHolder(WPosition.of(WType.ANCHORED, 0, 0, 1, mainInterface), WSize.of(175, 200), mainInterface);
        WTabHolder.WTab tabA = tabHolderA.addTab(Items.DIAMOND, new LiteralText("Inventory"));
        tabHolderA.addTab(Items.DEAD_BUSH, new LiteralText("Settings"));

        // inventory
        for (int y = 0; y < 3; y++) {
            for (int x = 0; x < 9; x++) {
                tabA.add(new WSlot(
                        WPosition.of(WType.FREE, 6 + 18 * x, 34 + 18 * y, 1),
                        WSize.of(18, 18),
                        mainInterface,
                        y * 9 + x,
                        1
                ));
            }
        }

        // player inventory
        for (int y = 0; y < 3; y++) {
            for (int x = 0; x < 9; x++) {
                tabA.add(new WSlot(
                        WPosition.of(WType.FREE, 6 + 18 * x, 112 + 18 * y, 1),
                        WSize.of(18, 18),
                        mainInterface,
                        36 - y * 9 + x,
                        0
                ));
            }
        }

        // hotbar
        for (int x = 0; x < 9; x++) {
            tabA.add(new WSlot(
                    WPosition.of(WType.FREE, 6 + 18 * x, 172, 1),
                    WSize.of(18, 18),
                    mainInterface,
                    x,
                    0
            ));
        }

        mainInterface.add(tabHolderA);
    }
}