appy 0.1.6

Declarative UI framework with native rendering
Documentation 
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use crate::{components::*, types::*};
use std::mem::take;

//#[derive(Debug)]
pub struct FlowConf {
    pub width: f32,
    pub height: f32,
    pub gap: f32,
    pub vgap: f32,
    pub align: Align,
    pub valign: VAlign,
}

//#[derive(Debug)]
struct FlowItem {
    element: Flow,
    x: f32,
}

//#[derive(Debug)]
struct FlowLine {
    items: Vec<FlowItem>,
    width: f32,
    height: f32,
}

impl FlowLine {
    pub fn new() -> Self {
        Self {
            items: vec![],
            width: 0.0,
            height: 0.0,
        }
    }

    pub fn can_fit(&self, conf: &FlowConf, width: f32) -> bool {
        if self.items.len() == 0 {
            return true;
        }

        self.width + conf.gap + width <= conf.width
    }

    pub fn add(&mut self, conf: &FlowConf, element: Flow) {
        let x = if self.items.len() == 0 {
            0.0
        } else {
            self.width + conf.gap
        };

        self.width = x + element.width.get_abs();
        if element.height.get_abs() > self.height {
            self.height = element.height.get_abs();
        }

        self.items.push(FlowItem { element, x });
    }
}

//#[derive(Debug)]
pub struct FlowBucket {
    conf: FlowConf,
    lines: Vec<FlowLine>,
}

impl FlowBucket {
    pub fn flow(elements: Vec<Flow>, conf: FlowConf) -> Elements {
        let mut flow_bucket = FlowBucket::new(conf);
        for element in elements {
            flow_bucket.add(element)
        }

        flow_bucket.create_blocks()
    }

    fn new(conf: FlowConf) -> Self {
        Self {
            conf,
            lines: vec![FlowLine::new()],
        }
    }

    fn current_line(&self) -> &FlowLine {
        let l = self.lines.len() - 1;
        &self.lines[l]
    }

    fn add(&mut self, element: Flow) {
        if !self
            .current_line()
            .can_fit(&self.conf, element.width.get_abs())
        {
            self.lines.push(FlowLine::new())
        }

        let l = self.lines.len() - 1;
        self.lines[l].add(&self.conf, element);
    }

    fn height(&self) -> f32 {
        let mut h: f32 = 0.;

        for i in 0..self.lines.len() {
            if i != 0 {
                h += self.conf.vgap;
            }
            h += self.lines[i].height;
        }

        h
    }

    fn create_blocks(&mut self) -> Elements {
        let mut elements: Elements = vec![];
        let mut y = match self.conf.valign {
            VAlign::Top => 0.,
            VAlign::Middle => (self.conf.height - self.height()) / 2.0,
            VAlign::Bottom => self.conf.height - self.height(),
        };

        for mut line in take(&mut self.lines) {
            let line_start = match self.conf.align {
                Align::Left => 0.,
                Align::Center => (self.conf.width - line.width) / 2.0,
                Align::Right => self.conf.width - line.width,
            };

            for item in take(&mut line.items) {
                elements.push(item.element.make_block(line_start + item.x, y));
            }

            y += line.height + self.conf.vgap;
        }

        elements
    }
}