pub fn progress_percentage(&self, len: usize, page_size: usize) -> usize {

        let step = self.selected().unwrap_or_default();

        let page_size = page_size as f64;

        let len = len as f64;

        let lines = page_size + step.saturating_sub(page_size as usize) as f64;

        let progress = (lines / len * 100_f64).ceil() as usize;

        if progress > 97 {

            Self::map_range((0, progress), (0, 100), progress)

        } else {

            progress

        }

    }

    fn map_range(from: (usize, usize), to: (usize, usize), value: usize) -> usize {

        to.0 + (value - from.0) * (to.1 - to.0) / (from.1 - from.0)

    }