62 lines
2.0 KiB
Rust
62 lines
2.0 KiB
Rust
use crate::library::prelude::*;
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use crate::library::text::{HorizontalAlign, ParNode};
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/// Align a node along the layouting axes.
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#[derive(Debug, Hash)]
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pub struct AlignNode {
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/// How to align the node horizontally and vertically.
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pub aligns: Spec<Option<RawAlign>>,
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/// The node to be aligned.
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pub child: LayoutNode,
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}
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#[node]
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impl AlignNode {
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fn construct(_: &mut Machine, args: &mut Args) -> TypResult<Content> {
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let aligns: Spec<Option<RawAlign>> = args.find()?.unwrap_or_default();
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let body: Content = args.expect("body")?;
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Ok(match (body, aligns) {
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(Content::Block(node), _) => Content::Block(node.aligned(aligns)),
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(other, Spec { x: Some(x), y: None }) => {
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other.styled(ParNode::ALIGN, HorizontalAlign(x))
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}
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(other, _) => Content::Block(other.pack().aligned(aligns)),
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})
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}
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}
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impl Layout for AlignNode {
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fn layout(
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&self,
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ctx: &mut Context,
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regions: &Regions,
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styles: StyleChain,
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) -> TypResult<Vec<Arc<Frame>>> {
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// The child only needs to expand along an axis if there's no alignment.
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let mut pod = regions.clone();
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pod.expand &= self.aligns.map_is_none();
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// Align paragraphs inside the child.
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let mut passed = StyleMap::new();
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if let Some(align) = self.aligns.x {
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passed.set(ParNode::ALIGN, HorizontalAlign(align));
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}
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// Layout the child.
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let mut frames = self.child.layout(ctx, &pod, passed.chain(&styles))?;
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for (region, frame) in regions.iter().zip(&mut frames) {
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// Align in the target size. The target size depends on whether we
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// should expand.
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let target = regions.expand.select(region, frame.size());
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let aligns = self
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.aligns
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.map(|align| align.resolve(styles))
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.unwrap_or(Spec::new(Align::Left, Align::Top));
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Arc::make_mut(frame).resize(target, aligns);
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}
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Ok(frames)
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}
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}
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