swapping mod code

public class SwappingKeybinds implements ModInitializer {
	public static final String MOD_ID = "swapping-keybinds";
	private static KeyBinding swapKey;
	private static KeyBinding swapSwapKey;
	private static int swapTo = 4;
	private static boolean toggleState = false;
	public static final Logger LOGGER = LoggerFactory.getLogger(MOD_ID);

	@Override
	public void onInitialize() {
		LOGGER.info("swapping keys init");
		swapKey = KeyBindingHelper.registerKeyBinding(new KeyBinding(
				"swap",
				InputUtil.Type.KEYSYM,
				GLFW.GLFW_KEY_R,
				"swapping keybinds"
		));
		swapSwapKey = KeyBindingHelper.registerKeyBinding(new KeyBinding(
				"change what to swap to",
				InputUtil.Type.KEYSYM,
				GLFW.GLFW_KEY_X,
				"swapping keybinds"
		));
		ClientTickEvents.END_CLIENT_TICK.register(client -> {
			while (swapKey.wasPressed()) {
				toggleState = !toggleState;
				int newSlot = toggleState ? swapTo : 0;
				client.player.getInventory().selectedSlot = newSlot;
			}
			while (swapSwapKey.wasPressed()) {
				int newSlot;
				if (swapTo == 6) {
					newSlot = 4;
					swapTo = 4;
				} else {
					newSlot = ++swapTo;
				}
				client.player.getInventory().selectedSlot = newSlot;
			}
		});
	}
}