readme.txt

Example class demonstrating how you can use the slider as a menu.

Add SliderMenu to the same game object as the Slider. Add an event handler (use dynamic) to the onIndexSelected property.

SliderMenu.cs

using System;
using UnityEngine;
using UnityEngine.Events;
using UnityEngine.EventSystems;
using UnityEngine.UI;

[RequireComponent(typeof(Slider))]
public class SliderMenu : MonoBehaviour
{
    Slider _slider;
    int _index = 0;
    Func<bool> _buttonActivated;

    public bool reactOnButtonDown;

    public string buttonName = "Fire1";

    public SliderMenuEvent onIndexSelected;

    void Awake()
    {
        _slider = GetComponent<Slider>();
        EventSystem.current.SetSelectedGameObject(gameObject);

        _slider.onValueChanged.AddListener(f => _index = (int)f);

        _buttonActivated = () => reactOnButtonDown ? Input.GetButtonDown(buttonName) :
                                                     Input.GetButtonUp(buttonName);
    }

    void Update()
    {
        if (_buttonActivated())
        {
            onIndexSelected.Invoke(_index);
        }
    }
}

[Serializable]
public class SliderMenuEvent : UnityEvent<int>
{

}

WriteToConsole.cs

using UnityEngine;

public class WriteToConsole : MonoBehaviour
{
    public void WriteValueToConsole(int index)
    {
        print(index);
    }
}