mirror of
https://github.com/typst/typst
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80 lines
2.4 KiB
Rust
80 lines
2.4 KiB
Rust
use crate::prelude::*;
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/// # Place
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/// Place content at an absolute position.
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///
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/// ## Parameters
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/// - alignment: Axes<Option<GenAlign>> (positional)
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/// Relative to which position in the parent container to place the content.
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///
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/// - body: Content (positional, required)
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/// The content to place.
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///
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/// - dx: Rel<Length> (named)
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/// The horizontal displacement of the placed content.
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///
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/// - dy: Rel<Length> (named)
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/// The vertical displacement of the placed content.
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///
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/// ## Category
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/// layout
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#[func]
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#[capable(Layout, Behave)]
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#[derive(Debug, Hash)]
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pub struct PlaceNode(pub Content, bool);
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#[node]
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impl PlaceNode {
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fn construct(_: &Vm, args: &mut Args) -> SourceResult<Content> {
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let aligns = args.find()?.unwrap_or(Axes::with_x(Some(GenAlign::Start)));
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let dx = args.named("dx")?.unwrap_or_default();
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let dy = args.named("dy")?.unwrap_or_default();
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let body = args.expect::<Content>("body")?;
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let out_of_flow = aligns.y.is_some();
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Ok(Self(body.moved(Axes::new(dx, dy)).aligned(aligns), out_of_flow).pack())
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}
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}
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impl Layout for PlaceNode {
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fn layout(
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&self,
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vt: &mut Vt,
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styles: StyleChain,
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regions: Regions,
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) -> SourceResult<Fragment> {
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let out_of_flow = self.out_of_flow();
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// The pod is the base area of the region because for absolute
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// placement we don't really care about the already used area.
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let pod = {
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let finite = regions.base.map(Abs::is_finite);
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let expand = finite & (regions.expand | out_of_flow);
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Regions::one(regions.base, regions.base, expand)
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};
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let mut frame = self.0.layout(vt, styles, pod)?.into_frame();
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// If expansion is off, zero all sizes so that we don't take up any
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// space in our parent. Otherwise, respect the expand settings.
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let target = regions.expand.select(regions.first, Size::zero());
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frame.resize(target, Align::LEFT_TOP);
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Ok(Fragment::frame(frame))
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}
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}
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impl PlaceNode {
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/// Whether this node wants to be placed relative to its its parent's base
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/// origin. Instead of relative to the parent's current flow/cursor
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/// position.
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pub fn out_of_flow(&self) -> bool {
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self.1
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}
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}
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impl Behave for PlaceNode {
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fn behaviour(&self) -> Behaviour {
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Behaviour::Ignorant
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}
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}
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