/// <summary>
/// Updates the lobby screen.
/// </summary>
public override void Update(GameTime gameTime, bool otherScreenHasFocus,
bool coveredByOtherScreen)
{
base.Update(gameTime, otherScreenHasFocus, coveredByOtherScreen);
if (!IsExiting)
{
if (networkSession.SessionState == NetworkSessionState.Playing)
{
// Check if we should leave the lobby and begin gameplay.
LoadingScreen.Load(ScreenManager, true,
new GameplayScreen(networkSession));
}
else if (networkSession.IsHost && networkSession.IsEveryoneReady)
{
// The host checks whether everyone has marked themselves
// as ready, and starts the game in response.
networkSession.StartGame();
}
}
}
/// <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()
{
// Remove the NetworkSessionComponent.
Game.Components.Remove(this);
// Remove the NetworkSession service.
Game.Services.RemoveService(typeof(NetworkSession));
// Dispose the NetworkSession.
networkSession.Dispose();
networkSession = null;
// 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 normally 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
// LobbyScreen and JoinSessionScreen, returning them to the
// CreateOrFindSessionsScreen (we cannot just back up to the
// JoinSessionScreen, because it contains search results that will no
// longer be valid). 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 CreateOrFindSessionScreen. 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 and go back to the main menu.
GameScreen[] screens = screenManager.GetScreens();
// Look for the CreateOrFindSessionsScreen.
for (int i = 0; i < screens.Length; i++)
{
if (screens[i] is CreateOrFindSessionScreen)
{
// 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);
}
return;
}
}
// If we didn't find a CreateOrFindSessionsScreen, reset everything and
// go back to the main menu. The why-did-the-session-end message box
// will be displayed after the loading screen has completed.
LoadingScreen.Load(screenManager, false, new BackgroundScreen(),
new MainMenuScreen(),
messageBox);
}
/// <summary>
/// Event handler for when the user selects ok on the "are you sure
/// you want to quit" message box. This uses the loading screen to
/// transition from the game back to the main menu screen.
/// </summary>
void ConfirmQuitMessageBoxAccepted(object sender, EventArgs e)
{
LoadingScreen.Load(ScreenManager, false, new BackgroundScreen(),
new MainMenuScreen());
}
/// <summary>
/// Event handler for when the Single Player menu entry is selected.
/// </summary>
void SinglePlayerMenuEntrySelected(object sender, EventArgs e)
{
LoadingScreen.Load(ScreenManager, true, new GameplayScreen(null));
}