cirnogodot/Scripts/MainMenu.cs

using Godot;
using System;

public partial class MainMenu : Control
{

	[Export]
	public string GameScene { get; set; }

	[Export]
	public string MainMenuScene { get; set; }
	
	[Export]
	public Control SubMenuHolder { get; set; } = new Control();

	[ExportCategory("Music Room")]
	[Export]
	public PackedScene MusicRoomTemplate { get; set; }

	[ExportCategory("Debug Menu")]
	[Export]
	public PackedScene DebugMenuTemplate { get; set; }

	
	// Called when the node enters the scene tree for the first time.
	public override void _Ready()
	{
	}

	// Called every frame. 'delta' is the elapsed time since the previous frame.
	public override void _Process(double delta)
	{
	}

	private void _on_start_button_pressed()
	{
		if (GameScene != null) {
			GlobalState.Instance.GotoScene(GameScene);
			//GetTree().ChangeSceneToFile(GameScene);
		}
	}

	private void _on_debug_button_pressed()
	{
		SpawnMenu<DebugMenu>(DebugMenuTemplate, SubMenuHolder);

		// if (DebugMenuTemplate is null || DebugMenuHolder is null) return;
		// DebugMenuHolder.Visible = true;
			
		// var children = DebugMenuHolder.GetChildren();
		// foreach (var child in children)
		// {
		// 	child.QueueFree();
		// }
			
		// var menu = DebugMenuTemplate.Instantiate<DebugMenu>();
			
		// DebugMenuHolder.CallDeferred("add_child", menu);

		// menu.DebugMenuClosed += () =>
		// {
		// 	DebugMenuHolder.Visible = false;
		// };
	}

	private void _on_music_room_button_pressed()
	{
		SpawnMenu<MusicRoom>(MusicRoomTemplate, SubMenuHolder);
	}

	private void SpawnMenu<T>(PackedScene template, Control holder) where T : MenuBase
	{
		if (template is null || holder is null) return;
		holder.Visible = true;
			
		var children = holder.GetChildren();
		foreach (var child in children)
		{
			child.QueueFree();
		}
			
		var menu = template.Instantiate<T>();
			
		holder.CallDeferred("add_child", menu);

		menu.MenuClosed += () =>
		{
			holder.Visible = false;
		};
	}

	private void _on_mainmenu_button_pressed()
	{
		if (MainMenuScene != null) {
			GlobalState.Instance.GotoScene(MainMenuScene);
			//GetTree().ChangeSceneToFile(MainMenuScene);
		}
	}

	private void _on_exit_button_pressed()
	{
		GetTree().Quit();
	}
}