XNA Game - Open a Popup or a Custom Game Screen before launching a game - xna-4.0

Question

Would it be possible to open a custom screen or a popup(modal) in an XNA Game.The idea is to display a few options to the user w.r.t the game and other apps that will be a part of the app suite.
public class MyGame : Game
{
#region Initialization
/// <summary>
/// Creates a new instance of the game.
/// </summary>
public MyGame()
{
graphics = new GraphicsDeviceManager(this);
Content.RootDirectory = "Content";
///etc;
}
/// <summary>
/// Performs initializations required by the game.
/// </summary>
protected override void Initialize()
{
///I would Like to open a new screen before the actual game
/// menu is displayed ... also return to this screen after the logic is run
/// in that screen
base.Initialize();
}
}
Any Ideas/Suggestions/Samples .
Thanks in Adv.
Krz.
Thanks Blau.I tried the DrawableGameComponent solution(copied the code from an article) but in vain.No matter what I do ,just a blank screen is displayed.
In the Game Constructor I put a condition and call the method as
if (showScreen)
{
LaunchScreen launcher = new LaunchScreen(this, null);
//Components.Add(launcher);
launcher.Show();
}
else{///constructor code}
I also put a condition in the Game Initialize so that if showScreen is flase then execute.(Not sure if its a proper way to do)
The Class looks like this :
public class LaunchScreen : DrawableGameComponent
{
private Texture2D backgroundImage = null;
private SpriteBatch spriteBatch = null;
public LaunchScreen(Game game, Texture2D texture)
: base(game)
{
backgroundImage = texture;
Visible = false;
Enabled = false;
}
public virtual void Show()
{
Visible = true;
Enabled = true;
}
public virtual void Hide()
{
Visible = false;
Enabled = false;
}
public override void Initialize()
{
base.Initialize();
}
public override void Update(GameTime gameTime)
{
base.Update(gameTime);
}
public override void Draw(GameTime gameTime)
{
//if (backgroundImage != null)
//{
spriteBatch = new SpriteBatch(base.GraphicsDevice);
if (Game.Services.GetService(typeof(SpriteBatch)) == null)
Game.Services.AddService(typeof(SpriteBatch), spriteBatch);
Rectangle screen = new Rectangle(0, 0,
Game.Window.ClientBounds.Width,
Game.Window.ClientBounds.Height);
Texture2D lauT2D = this.Game.Content.Load<Texture2D>("Textures/BG");
spriteBatch.Draw(lauT2D, screen, Color.White);
//}
///SpriteFont font = this.Game.Content.Load<SpriteFont>("Fonts/MenuFont");
///Vector2 spritePosition = Vector2.One;
///spriteBatch.DrawString(font, "Goodness ME", spritePosition, Color.White);
base.Draw(gameTime);
}
}
I am totally confused on how to initialize the GraphicDevice and the SpriteBatch and open the window before the actual game runs/initializes.
Krz

Answer 1

This is a stack of screens, the top screen is the one that is updated/drawed
You can implement screens for you menu, config, tutorial, solo game, multiplayer game, pause menu....etc.
public class ScreenManager : DrawableGameComponent
{
Stack<Screen> Screens = new Stack<Screen>();
public event Action<Screen> PopDone;
public event Action<Screen> PushDone;
public override void Update(gametime)
{
if (Screens.Count>0) Screens.Peek().Update(gametime);
}
public override void Draw(gametime)
{
if (Screens.Count>0) Screens.Peek().Draw(gametime);
}
public void Push(Screen screen)
{
Stack.Push(screen);
if (PushDone!=null) PushDone(screen);
}
public void Pop()
{
Screen screen = Stack.Pop();
if (PopDone!=null) PopDone(screen);
}
}
public abstract class Screen : DrawableGameComponent()
{
protected ScreenManager Manager;
public Screen(ScreenManager manager) {
this.Manager = manager;
}
// Your template code for screens
}
public class MenuScreen : Screen
{
public void Update()
{
if (ChooseConfig())
{
Manager.Push(new ConfigScreen());
}
}
}
public class ConfigScreen : Screen
{
public void Update()
{
if (ChooseReturn())
{
Manager.Pop();
}
}
}
public Game1: Game {
ScreenManager Manager;
public override Initialize()
{
Manager = new ScreenManager(this);
Manager.PopDone += ScreenPopDone;
Manager.Push( new MenuScreen() );
}
void ScreenPopDone(Screen sender)
{
if (sender is MenuScreen)
{
Exit();
}
}
}