public abstract class ManagedScreen implements Screen {
    private Game game;

    private boolean slowMotion;
    private float slowMotionFactor;

    public ManagedScreen(Game game) {
        this.game = game;
        slowMotion = false;
        slowMotionFactor = 1;
    }

    @Override
    public final void render(float secElapsed) {
        updateSlowMotionFactor(secElapsed);
        secElapsed *= slowMotionFactor;

        managedRender(secElapsed);
    }

    private void updateSlowMotionFactor(float secElapsed) {
        if (slowMotion) {
            slowMotionFactor = Math.max(game.getGameConf().getSlowMotionFactor(), slowMotionFactor-(secElapsed/game.getGameConf().getSlowMotionFadeInTime()));
        }
        else {
            slowMotionFactor = Math.min(1, slowMotionFactor+(secElapsed/game.getGameConf().getSlowMotionFadeOutTime()));
        }
    }

    public abstract void managedRender(float secElapsed);
}