BlisterUI.MainGame.Update C# (CSharp) Méthode

        protected override void Update(GameTime gameTime)
        {
            lastTime = gameTime;
            if(screen != null) {
                switch(screen.State) {
                    case ScreenState.Running:
                        screen.Update(gameTime);
                        break;
                    case ScreenState.ChangeNext:
                        screen.OnExit(gameTime);
                        screen = screenList.Next;
                        if(screen != null) {
                            screen.SetRunning();
                            screen.OnEntry(gameTime);
                        }
                        break;
                    case ScreenState.ChangePrevious:
                        screen.OnExit(gameTime);
                        screen = screenList.Previous;
                        if(screen != null) {
                            screen.SetRunning();
                            screen.OnEntry(gameTime);
                        }
                        break;
                    case ScreenState.ExitApplication:
                        Exit();
                        return;
                }
                base.Update(gameTime);
            }
            else {
                Exit();
            }
        }