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public class InputAnnouncer : MonoBehaviour {
    public static InputAnnouncer Instance;

    public delegate void JumpListener();
    public event JumpListener OnJump;

    public void Awake() {
        Instance = this;
    }

    public void OnDestroy() {
        Instance = null;
    }

    public void FireOnJump() {
        if (OnJump != null) {
            OnJump();
        }
    }
}

public class PcInput : MonoBehaviour {
    private InputAnnouncer Announcer;

    public void Awake() {
        Announcer = GetComponent<InputAnnouncer>();
    }

    public void Update() {
        if (Input.GetKeyDown(KeyCode.Space)) {
            Announcer.FireOnJump();
        }
    }
}

public class PlayerMovement : MonoBehaviour {
    public void OnEnable() {
        InputAnnouncer.Instance.OnJump += OnJump;
    }

    public void OnDisable() {
        InputAnnouncer.Instance.OnJump -= OnJump;
    }

    private void OnJump() {
        // Increase the player's upward velocity
    }
}