/// <summary>
/// Allows each screen to run logic.
/// </summary>
public override void Update(GameTime gameTime)
{
// Read the keyboard and gamepad.
_input.Update(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();
foreach (GameScreen screen in _screens)
{
_screensToUpdate.Add(screen);
}
bool otherScreenHasFocus = !Game.IsActive;
bool 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 screen = _screensToUpdate[_screensToUpdate.Count - 1];
_screensToUpdate.RemoveAt(_screensToUpdate.Count - 1);
// Update the screen.
screen.Update(gameTime, otherScreenHasFocus, coveredByOtherScreen);
if (screen.ScreenState == ScreenState.TransitionOn ||
screen.ScreenState == ScreenState.Active)
{
// If this is the first active screen we came across,
// give it a chance to handle input.
if (!otherScreenHasFocus)
{
_input.ShowCursor = screen.HasCursor;
_input.EnableVirtualStick = screen.HasVirtualStick;
screen.HandleInput(_input, gameTime);
otherScreenHasFocus = true;
}
// If this is an active non-popup, inform any subsequent
// screens that they are covered by it.
if (!screen.IsPopup)
{
coveredByOtherScreen = true;
}
}
}
}
