cirnogodot/Scripts/UI/OptionsMenu.cs

using Godot;
using Godot.Collections;

namespace Cirno.Scripts.UI;

public partial class OptionsMenu : MenuBase
{
    [Export] public Array<Vector2I> Resolutions =
    [
        new(320, 160),
        new(512, 256),
        new(640, 320),
        new(1024, 512),
        new(1280, 640),
        new(1920, 1080),
    ];

    [Export] public OptionButton ResolutionsList { get; private set; }
    
    [Export] public CheckBox VSyncToggle { get; private set; }
    [Export] public CheckBox FullScreenToggle { get; private set; }
    
    //[Export] public HSlider MusicVolumeSlider { get; private set; }
    
    public override void _Ready()
    {
        foreach (var resolution in Resolutions)
        {
            ResolutionsList.AddItem($"{resolution.X}x{resolution.Y}");
        }

        ResolutionsList.ItemSelected += ResolutionsListOnItemSelected;

        VSyncToggle.SetPressed(DisplayServer.WindowGetVsyncMode() == DisplayServer.VSyncMode.Enabled);
        
        VSyncToggle.Toggled += VSyncToggleOnToggled;
        
        FullScreenToggle.SetPressed(DisplayServer.WindowGetMode() is DisplayServer.WindowMode.Fullscreen);
    }

    private void VSyncToggleOnToggled(bool toggledOn)
    {
        if (toggledOn)
        {
            DisplayServer.WindowSetVsyncMode(DisplayServer.VSyncMode.Enabled);
        }
        else
        {
            DisplayServer.WindowSetVsyncMode(DisplayServer.VSyncMode.Disabled);
        }
    }

    private void ResolutionsListOnItemSelected(long index)
    {
        GD.Print($"Selected index: {index} {Resolutions[(int)index]}");
        DisplayServer.WindowSetSize(Resolutions[(int)index]);
    }
}