/// <summary>
/// Allows each screen to run logic.
/// </summary>
public override void Update(GameTime gameTime)
{
// Read the keyboard and gamepad.
input.Update();
// 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)
{
screen.HandleInput(input);
otherScreenHasFocus = true;
}
// If this is an active non-popup, inform any subsequent
// screens that they are covered by it.
if (!screen.IsPopup)
{
coveredByOtherScreen = true;
}
}
}
// Print debug trace?
if (traceEnabled)
{
TraceScreens();
}
}