/// <summary>
/// Draws the loading screen.
/// </summary>
public override void Draw(GameTime gameTime)
{
// If we are the only active screen, that means all the previous screens
// must have finished transitioning off. We check for this in the Draw
// method, rather than in Update, because it isn't enough just for the
// screens to be gone: in order for the transition to look good we must
// have actually drawn a frame without them before we perform the load.
if ((ScreenState == ScreenState.Active) &&
(ScreenManager.GetScreens().Length == 1))
{
otherScreensAreGone = true;
}
// The gameplay screen takes a while to load, so we display a loading
// message while that is going on, but the menus load very quickly, and
// it would look silly if we flashed this up for just a fraction of a
// second while returning from the game to the menus. This parameter
// tells us how long the loading is going to take, so we know whether
// to bother drawing the message.
if (loadingIsSlow)
{
SpriteBatch spriteBatch = ScreenManager.SpriteBatch;
SpriteFont font = ScreenManager.Font;
string message = Resources.Loading;
// Center the text in the viewport.
Viewport viewport = ScreenManager.GraphicsDevice.Viewport;
Vector2 viewportSize = new Vector2(viewport.Width, viewport.Height);
Vector2 textSize = font.MeasureString(message);
Vector2 textPosition = (viewportSize - textSize) / 2;
Color color = Color.White * TransitionAlpha;
// Animate the number of dots after our "Loading..." message.
loadAnimationTimer += gameTime.ElapsedGameTime;
int dotCount = (int)(loadAnimationTimer.TotalSeconds * 5) % 10;
message += new string('.', dotCount);
// Draw the text.
spriteBatch.Begin();
spriteBatch.DrawString(font, message, textPosition, color);
spriteBatch.End();
}
}
/// <summary>
/// Activates the loading screen.
/// </summary>
public static void Load(ScreenManager screenManager, bool loadingIsSlow,
PlayerIndex?controllingPlayer,
params GameScreen[] screensToLoad)
{
// Tell all the current screens to transition off.
foreach (GameScreen screen in screenManager.GetScreens())
{
screen.ExitScreen();
}
// Create and activate the loading screen.
LoadingScreen loadingScreen = new LoadingScreen(screenManager,
loadingIsSlow,
screensToLoad);
screenManager.AddScreen(loadingScreen, controllingPlayer);
}
/// <summary>
/// Internal method for leaving the network session. This disposes the
/// session, removes the NetworkSessionComponent, and returns the user
/// to the main menu screen.
/// </summary>
void LeaveSession()
{
// Destroy this NetworkSessionComponent.
Dispose();
// If we have a sessionEndMessage string explaining why the session has
// ended (maybe this was a network disconnect, or perhaps the host kicked
// us out?) create a message box to display this reason to the user.
MessageBoxScreen messageBox;
if (!string.IsNullOrEmpty(sessionEndMessage))
{
messageBox = new MessageBoxScreen(sessionEndMessage, false);
}
else
{
messageBox = null;
}
// At this point we want to return the user all the way to the main
// menu screen. But what if they just joined a session? In that case
// they went through this flow of screens:
//
// - MainMenuScreen
// - CreateOrFindSessionsScreen
// - JoinSessionScreen (if joining, skipped if creating a new session)
// - LobbyScreeen
//
// If we have these previous screens on the history stack, and the user
// backs out of the LobbyScreen, the right thing is just to pop off the
// intermediate screens, returning them to the existing MainMenuScreen
// instance without bothering to reload everything. But if the user is
// in gameplay, or has been in gameplay and then returned to the lobby,
// the screen stack will have been emptied.
//
// To do the right thing in both cases, we scan through the screen history
// stack looking for a MainMenuScreen. If we find one, we pop any
// subsequent screens so as to return back to it, while if we don't
// find it, we just reset everything via the LoadingScreen.
GameScreen[] screens = screenManager.GetScreens();
// Look for the MainMenuScreen.
for (int i = 0; i < screens.Length; i++)
{
if (screens [i] is MainMenuScreen)
{
// If we found one, pop everything since then to return back to it.
for (int j = i + 1; j < screens.Length; j++)
{
screens [j].ExitScreen();
}
// Display the why-did-the-session-end message box.
if (messageBox != null)
{
screenManager.AddScreen(messageBox, null);
}
return;
}
}
// If we didn't find an existing MainMenuScreen, reload everything.
// The why-did-the-session-end message box will be displayed after
// the loading screen has completed.
LoadingScreen.Load(screenManager, false, null, new BackgroundScreen(),
new MainMenuScreen(),
messageBox);
}
/// <summary>
/// Activates the loading screen.
/// </summary>
public static void Load (ScreenManager screenManager, bool loadingIsSlow,
PlayerIndex? controllingPlayer,
params GameScreen[] screensToLoad)
{
// Tell all the current screens to transition off.
foreach (GameScreen screen in screenManager.GetScreens ())
screen.ExitScreen ();
// Create and activate the loading screen.
LoadingScreen loadingScreen = new LoadingScreen (screenManager,
loadingIsSlow,
screensToLoad);
screenManager.AddScreen (loadingScreen, controllingPlayer);
}
