zhc_ir 0.1.8

Graph-based intermediate representation framework with dialect support
Documentation 
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use super::*;
use std::marker::PhantomData;
use zhc_utils::{
    graphics::{Frame, Height, Justify, Size},
    iter::Separate,
};

enum Spaced<E> {
    Element(E),
    Space,
}

/// Vertical stack container that arranges child elements top to bottom with spacing.
pub struct VStack<E: Element, C: Class = NoClass> {
    pub content: Vec<E>,
    class: PhantomData<C>,
    variable: VariableCell,
}

impl<E: Element, C: Class> VStack<E, C> {
    /// Creates a new vertical stack with the given child elements.
    pub fn new(content: Vec<E>) -> Self {
        Self {
            content,
            class: PhantomData,
            variable: VariableCell::fresh(),
        }
    }
}

impl<E: Element, C: Class> Element for VStack<E, C> {
    fn solve_size(&mut self, stylesheet: &StyleSheet) {
        let style = stylesheet.get::<C>();
        let size = self
            .content
            .iter_mut()
            .map(Spaced::Element)
            .separate_with(|| Spaced::Space)
            .fold(Size::ZERO, |size, element| match element {
                Spaced::Element(element) => {
                    element.solve_size(stylesheet);
                    size.stack_vertical(element.get_size())
                }
                Spaced::Space => size.pad_bottom(style.spacing),
            })
            .pad(style.padding);
        self.variable.set_size(size);
    }

    fn solve_frame(&mut self, stylesheet: &StyleSheet, available: Frame) {
        let style = stylesheet.get::<C>();
        let intrinsic = self.get_size();

        // Determine VStack's frame based on justify mode.
        let frame = match style.vjustify {
            Justify::Pack => available.resize(&intrinsic, style.halign, style.valign),
            Justify::Space | Justify::Spread => {
                available.resize_horizontal(intrinsic.width, style.halign)
            }
        };
        self.variable.set_frame(frame.clone());

        // Compute inner frame (after padding) and child heights.
        let inner = frame.crop_around(style.padding);
        let heights: Vec<Height> = self.content.iter().map(|e| e.get_size().height).collect();

        // Get child frames from pack, justify, or spread.
        let child_frames = match style.vjustify {
            Justify::Pack => inner.pack_vertical(&heights, style.valign, style.spacing),
            Justify::Space => inner.justify_vertical(&heights),
            Justify::Spread => inner.spread_vertical(&heights),
        };

        // Position each child.
        for (element, child_frame) in self.content.iter_mut().zip(child_frames) {
            element.solve_frame(stylesheet, child_frame);
        }
    }

    fn get_size(&self) -> Size {
        self.variable.get_size()
    }

    fn get_frame(&self) -> Frame {
        self.variable.get_frame()
    }

    fn get_variable_cell(&self) -> VariableCell {
        self.variable.clone()
    }
}