KeyInput by KeyCode with delegates

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

public class InputController : MonoBehaviour {

    private List<KeyCode> keys = new List<KeyCode>();
    private List<bool> keysDown = new List<bool>();

    public delegate void KeyPress(KeyCode key);
    public event KeyPress OnKeyPress = delegate { };
    public event KeyPress OnKeyHold = delegate { };
    public event KeyPress OnKeyRelease = delegate { };

    public void AddKey(KeyCode _key)
    {
        keys.Add(_key);
        keysDown.Add(false);
    }
    public void DeleteKey(KeyCode _key)
    {
        keysDown.RemoveAt(keys.IndexOf(_key));
        keys.RemoveAt(keys.IndexOf(_key));
    }
    public void ClearKeys()
    {
        keys.Clear();
        keysDown.Clear();
    }

    void Update () {
        for (int i=0; i<keys.Count; i++)
        {
            if (!keysDown[i] && Event.current.keyCode == keys[i])
            {
                OnKeyPress(Event.current.keyCode);
                keysDown[i] = true;
                continue;
            }

            if (Event.current.keyCode == keys[i] && Event.current.type == EventType.KeyUp) {
                OnKeyRelease(Event.current.keyCode);
                keysDown[i] = false;
                continue;
            }

            if (keysDown[i] && Event.current.keyCode == keys[i] && Event.current.type != EventType.KeyUp)
            {
                OnKeyHold(Event.current.keyCode);
                continue;
            }
        }
    }
}