ironpress 1.4.4

Pure Rust HTML/CSS/Markdown to PDF converter with layout engine, LaTeX math, tables, images, custom fonts, and streaming output. No browser, no system dependencies.
Documentation 
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use super::{
    Container, FragmentPlacement, FragmentPlacementOwner, LayoutElement, PrincipalBox,
    impl_principal_layout_element,
};

/// The principal box of a CSS multi-column formatting context.
///
/// Columns are implementation-positioned children of the composed ordinary
/// box. Keeping the principal box as a distinct layout node lets pagination
/// fragment those column rows without teaching every painter about a second
/// copy of generic container properties.
#[derive(Debug, Clone)]
pub(crate) struct MulticolContainer {
    pub(crate) principal: Container,
}

impl MulticolContainer {
    pub(crate) const fn new(principal: Container) -> Self {
        Self { principal }
    }
}

/// One anonymous column box in a multicol line.
///
/// The document-order index is retained so fragmentation can decide whether a
/// column rule still has content-bearing columns on both sides.
#[derive(Debug, Clone)]
pub(crate) struct MulticolColumn {
    pub(crate) principal: Container,
    pub(crate) index: usize,
    placement: FragmentPlacement,
}

impl MulticolColumn {
    pub(crate) const fn new(
        principal: Container,
        index: usize,
        placement: FragmentPlacement,
    ) -> Self {
        Self {
            principal,
            index,
            placement,
        }
    }

    pub(crate) fn with_principal(&self, principal: Container) -> Self {
        let mut placement = self.placement;
        if let Some(width) = principal.box_model.size.width.fixed_value() {
            placement.size.width = width;
        }
        if let Some(height) = principal.box_model.size.height.used() {
            placement.size.height = height;
        }
        Self::new(principal, self.index, placement)
    }
}

impl FragmentPlacementOwner for MulticolColumn {
    fn fragment_placement(&self) -> FragmentPlacement {
        self.placement
    }

    fn fragment_source(&self) -> &dyn LayoutElement {
        &self.principal
    }
}

impl PrincipalBox for MulticolContainer {
    fn principal(&self) -> &Container {
        &self.principal
    }

    fn principal_mut(&mut self) -> &mut Container {
        &mut self.principal
    }
}

impl PrincipalBox for MulticolColumn {
    fn principal(&self) -> &Container {
        &self.principal
    }

    fn principal_mut(&mut self) -> &mut Container {
        &mut self.principal
    }
}

impl_principal_layout_element!(MulticolContainer, visit_multicol_container);
impl_principal_layout_element!(MulticolColumn, visit_multicol_column, fragment_placement);