Rebinder.cs

// Rebinding using InputSystem from Prokuv'o

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

using UnityEngine.InputSystem;

public class Rebinder : MonoBehaviour
{
    public bool bindingInProgress { get; private set; }
    
    // Latch UI onto this for binding complete callback
    public delegate void BindingComplete();
    public event BindingComplete OnBindingComplete;

    // Debug
    public Transform inputPreview;

    Vector2 moveInput;
    bool interactInput;

#if UNITY_EDITOR
    // For visual debugging purposes only
    private void Update()
    {
        for (int i = 0; i < 2; i++)
        {
            DomacinInputManager.Actions p = i == 0 ?
                DomacinInputManager.e.p1 :
                DomacinInputManager.e.p2;

            interactInput = p.interactAction.triggered;

            float x = p.moveLeftAction.ReadValue<float>() == 1 ? -1 : p.moveRightAction.ReadValue<float>() == 1 ? 1 : 0;
            float y = p.moveDownAction.ReadValue<float>() == 1 ? -1 : p.moveUpAction.ReadValue<float>() == 1 ? 1 : 0;
            moveInput = new Vector2(x, y);
        }

        if (inputPreview)
            inputPreview.position = new Vector3(moveInput.x, moveInput.y);
    }
#endif

    public void StartRebindDirection(int player, int dir)
    {
        DomacinInputManager.Actions p = player == 0 ?
            DomacinInputManager.e.p1 :
            DomacinInputManager.e.p2;

        if (!bindingInProgress)
        {
            var action =
                dir == 0 ? p.moveLeftAction :
                dir == 1 ? p.moveRightAction :
                dir == 2 ? p.moveUpAction :
                dir == 3 ? p.moveDownAction :
                p.interactAction;

            Debug.Log("Started rebinding " + action.name);

            // You MUST disable the action during rebinding
            action.Disable();

            action.PerformInteractiveRebinding()
                .WithControlsExcluding("Mouse")
                .WithCancelingThrough("<Keyboard>/escape")
                .OnMatchWaitForAnother(0.1f)
                .OnApplyBinding((op, keyPath) =>
                {
                    Debug.Log("End binding");
                    
                    // Necessary, missed out from docs:
                    action.ApplyBindingOverride(0, keyPath);
                    
                    Debug.Log("Bindings " + op.action.bindings[0]);
                })
                .OnComplete(op =>
                {
                    op.Dispose();
                    Debug.Log("Binding complete");
                    action.Enable();
                    bindingInProgress = false;
                    OnBindingComplete?.Invoke();
                })
                .OnCancel((op) =>
                {
                    op.Dispose();
                    Debug.Log("Canceled binding");
                    bindingInProgress = false;
                    action.Enable();

                    OnBindingComplete?.Invoke();
                })
                .Start();

            bindingInProgress = true;
        }
    }
}