pub trait LevelBarExt {
    fn add_offset_value(&self, name: &str, value: f64);
    fn get_inverted(&self) -> bool;
    fn get_max_value(&self) -> f64;
    fn get_min_value(&self) -> f64;
    fn get_mode(&self) -> LevelBarMode;
    fn get_offset_value<'a, P: Into<Option<&'a str>>>(
        &self, 
        name: P
    ) -> Option<f64>;
    fn get_value(&self) -> f64;
    fn remove_offset_value<'a, P: Into<Option<&'a str>>>(&self, name: P);
    fn set_inverted(&self, inverted: bool);
    fn set_max_value(&self, value: f64);
    fn set_min_value(&self, value: f64);
    fn set_mode(&self, mode: LevelBarMode);
    fn set_value(&self, value: f64);
    fn connect_offset_changed<F: Fn(&Self, &str) + 'static>(&self, f: F) -> u64;
}
            Required Methods
            
        Implementors