pub fn step_completed(&mut self) {
        if self.enabled {
            self.step_time.pause();
        }
    }
/// Notfy that the time-step has finished.
Notfy that the time-step has finished.
Notfy that the time - step has finished .
pub fn step_completed(&mut self) {
        if self.enabled {
            self.step_time.pause();
        }
    }
pub fn step_completed ( & mut self ) { if self . enabled { self . step_time . pause ( ) ; } }
Notfy that the time-step has finished.
Notfy that the time - step has finished .
&mut self