campfire/Assets/Scripts/PauseMenu.cs

using UnityEngine;
using UnityEngine.UI;

[RequireComponent(typeof(CanvasGroup))]
public class PauseMenu : MonoBehaviour {
    public GameState GameState;
    public Options Options;

    [Header("Option inputs")]
    public Toggle InvertMouseY;
    public Toggle CameraBobbing;
    public Slider MouseSensitivity;
    public Slider MasterVolume;
    public Slider CampfireVolume;
    public Slider AmbientVolume;
    public Slider FootstepVolume;

    private CanvasGroup Canvas;
    private bool Paused {
        get {
            return GameState.Current == State.Paused;
        }
    }

    private void Awake() {
        Canvas = GetComponent<CanvasGroup>();
        Fade(true);
    }

    private void Start() {
        InvertMouseY.isOn = Options.InvertMouseY;
        CameraBobbing.isOn = Options.CameraBobbing;
        MouseSensitivity.value = Options.MouseSensitivity;
        MasterVolume.value = Options.MasterVolume;
        CampfireVolume.value = Options.CampfireVolume;
        AmbientVolume.value = Options.AmbientVolume;
        FootstepVolume.value = Options.FootstepVolume;
    }

    private void Update() {
        Fade(false);
    }

    private void Fade(bool instant) {
        Canvas.alpha = Mathf.Lerp(Canvas.alpha, Paused ? 1 : 0, instant ? 1 : 10f * Time.unscaledDeltaTime);
        Canvas.blocksRaycasts = Paused;
        Canvas.interactable = Paused;
    }

    public void Resume() {
        GameState.Current = State.Playing;
    }

    public void Quit() {
        Application.Quit();
    }
}