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use crate::library::prelude::*;
use crate::library::text::{HorizontalAlign, ParNode};
/// Align a node along the layouting axes.
#[derive(Debug, Hash)]
pub struct AlignNode {
/// How to align the node horizontally and vertically.
pub aligns: Spec<Option<RawAlign>>,
/// The node to be aligned.
pub child: LayoutNode,
}
#[node]
impl AlignNode {
fn construct(_: &mut Context, args: &mut Args) -> TypResult<Content> {
let aligns: Spec<_> = args.find()?.unwrap_or_default();
let body: LayoutNode = args.expect("body")?;
Ok(Content::block(body.aligned(aligns)))
}
}
impl Layout for AlignNode {
fn layout(
&self,
ctx: &mut Context,
regions: &Regions,
styles: StyleChain,
) -> TypResult<Vec<Arc<Frame>>> {
// The child only needs to expand along an axis if there's no alignment.
let mut pod = regions.clone();
pod.expand &= self.aligns.map_is_none();
// Align paragraphs inside the child.
let mut passed = StyleMap::new();
if let Some(align) = self.aligns.x {
passed.set(ParNode::ALIGN, HorizontalAlign(align));
}
// Layout the child.
let mut frames = self.child.layout(ctx, &pod, passed.chain(&styles))?;
for (region, frame) in regions.iter().zip(&mut frames) {
// Align in the target size. The target size depends on whether we
// should expand.
let target = regions.expand.select(region, frame.size);
let aligns = self
.aligns
.map(|align| align.resolve(styles))
.unwrap_or(Spec::new(Align::Left, Align::Top));
Arc::make_mut(frame).resize(target, aligns);
}
Ok(frames)
}
}
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