/// <summary>
/// Allows each screen to run logic.
/// </summary>
public override void Update(GameTime gameTime)
{
// Make a copy of the master screen list, to avoid confusion if
// the process of updating one screen adds or removes others.
_screensToUpdate.Clear();
lock (_screens)
for (Int32 i = 0; i < _screens.Count; i++)
{
_screensToUpdate.Add(_screens[i]);
}
// Exit Game if there is nothing more to show or update
if (_screensToUpdate.Count == 0)
{
if (NoMoreScreens != null)
{
NoMoreScreens.Invoke(this, EventArgs.Empty);
}
else
{
Game.Exit();
}
}
// Get Game State and Screen State
Boolean i_otherScreenHasFocus = !Game.IsActive;
Boolean i_coveredByOtherScreen = false;
// Loop as long as there are _screens waiting to be updated.
while (_screensToUpdate.Count > 0)
{
// Pop the topmost screen off the waiting list.
GameScreen i_screen = _screensToUpdate[_screensToUpdate.Count - 1];
_screensToUpdate.RemoveAt(_screensToUpdate.Count - 1);
// Update the screen.
if (i_screen.IsEnabled)
{
i_screen.Update(gameTime, i_otherScreenHasFocus, i_coveredByOtherScreen);
if (i_screen.ScreenState == ScreenState.TransitionOn ||
i_screen.ScreenState == ScreenState.Active)
{
// If this is the first active screen we came across,
// give it a chance to handle _input.
if (i_screen.IsCapturingInput)
{
i_screen.HandleInput(gameTime);
i_otherScreenHasFocus = true;
}
// If this is some active popup, handle _input
else if (i_screen.IsPopup)
{
i_screen.HandleInput(gameTime);
}
// If this is an active non-popup, inform any subsequent
// _screens that they are covered by it.
if (!i_screen.IsPopup)
{
i_coveredByOtherScreen = true;
}
}
}
}
// Print debug trace?
if (TraceEnabled)
{
TraceScreens();
}
}
