sge_ui 1.2.0

UI library for SGE
Documentation 
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use std::cmp::Ordering;

use super::*;

#[derive(Default, Debug)]
pub struct Col {
    pub gap: f32,
    pub children: Vec<Child>,
}

impl Col {
    pub fn new(children: impl Into<Vec<Child>>) -> UiRef {
        Self {
            children: children.into(),
            gap: 0.0,
        }
        .to_ref()
    }

    pub fn with_gap(gap: f32, children: impl Into<Vec<Child>>) -> UiRef {
        Self {
            gap,
            children: children.into(),
        }
        .to_ref()
    }
}

pub(crate) fn col_calc_preferred_dimensions(children: &[Child], gap: f32) -> Vec2 {
    let dimensions = children
        .iter()
        .map(|child| child.node.preferred_dimensions());

    let x = dimensions
        .clone()
        .map(|d| d.x)
        .max_by(|a, b| {
            if a > b {
                Ordering::Greater
            } else if a < b {
                Ordering::Less
            } else {
                Ordering::Equal
            }
        })
        .unwrap_or(0.0);

    let y = dimensions.clone().map(|d| d.y).sum::<f32>()
        + gap * (children.len().saturating_sub(1)) as f32;

    Vec2::new(x, y)
}

pub(crate) fn col_calc_size(children: &[Child], gap: f32, area: Area) -> Vec2 {
    let mut y_offset = 0.0;
    let mut max_width: f32 = 0.0;

    for child in children.iter() {
        let new_area = {
            let mut a = area;
            a.top_left.y += y_offset;
            a
        };

        let dimensions = child.node.size(new_area);

        y_offset += dimensions.y + gap;
        max_width = max_width.max(dimensions.x);
    }

    Vec2::new(max_width, y_offset - gap)
}

impl UiNode for Col {
    fn preferred_dimensions(&self) -> Vec2 {
        col_calc_preferred_dimensions(&self.children, self.gap)
    }

    fn size(&self, area: Area) -> Vec2 {
        col_calc_size(&self.children, self.gap, area)
    }

    fn draw(&self, area: Area, state: &UiState) -> Vec2 {
        let mut y_offset = 0.0;
        let mut max_width: f32 = 0.0;

        for child in self.children.iter() {
            let new_area = {
                let mut a = area;
                a.top_left.y += y_offset;
                a
            };

            let dimensions = child.node.draw(new_area, state);

            y_offset += dimensions.y + self.gap;
            max_width = max_width.max(dimensions.x);
        }

        Vec2::new(max_width, y_offset - self.gap)
    }
}