RuinAdventurer/Scripts/UI/Menus/OptionsMenu.cs

using Godot;

public partial class OptionsMenu : PanelContainer
{
    private readonly Vector2 panelSize = new Vector2(420, 260);

    [Export] private OptionButton screenMode;
    [Export] private HSlider soundVolume;
    [Export] private ColorPickerButton lightColor;

    public override void _Ready()
    {
        CenterPanel();
        SetupScreenModes();
        screenMode.Select(GameData.screenMode);
        soundVolume.Value = GameData.soundVolume * 100f;
        lightColor.Color = GameData.lightColor;
        ApplyScreenMode(GameData.screenMode);
        SoundManager.SetMasterVolume(GameData.soundVolume);
    }

    private void SetupScreenModes()
    {
        screenMode.Clear();
        screenMode.AddItem("Fullscreen");
        screenMode.AddItem("Windowed");
        screenMode.AddItem("Windowed Fullscreen");
        screenMode.Select(2);
    }

    public void OnScreenModeSelected(int index)
    {
        GameData.screenMode = index;
        ApplyScreenMode(index);
    }

    private void ApplyScreenMode(int index)
    {
        switch (index)
        {
            case 0:
                DisplayServer.WindowSetMode(DisplayServer.WindowMode.Fullscreen);
                DisplayServer.WindowSetFlag(DisplayServer.WindowFlags.Borderless, false);
                break;
            case 1:
                DisplayServer.WindowSetMode(DisplayServer.WindowMode.Windowed);
                DisplayServer.WindowSetFlag(DisplayServer.WindowFlags.Borderless, false);
                break;
            case 2:
                DisplayServer.WindowSetMode(DisplayServer.WindowMode.Fullscreen);
                DisplayServer.WindowSetFlag(DisplayServer.WindowFlags.Borderless, true);
                break;
        }
    }

    public void OnSoundVolumeChanged(double value)
    {
        GameData.soundVolume = (float)value / 100f;
        SoundManager.SetMasterVolume(GameData.soundVolume);
    }

    public void OnLightColorChanged(Color color)
    {
        GameData.lightColor = color;
        LightHandler.RedrawLights(color);
    }

    public void CloseOptions()
    {
        Hide();
        GameData.isPaused = false;
    }

    private void CenterPanel()
    {
        CustomMinimumSize = panelSize;
        SetAnchorsPreset(LayoutPreset.Center);
        OffsetLeft = -panelSize.X / 2f;
        OffsetTop = -panelSize.Y / 2f;
        OffsetRight = panelSize.X / 2f;
        OffsetBottom = panelSize.Y / 2f;
    }
}