48 lines
1.4 KiB
Rust
48 lines
1.4 KiB
Rust
use std::fmt::{self, Debug, Formatter};
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use super::*;
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/// A node that inserts spacing.
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#[derive(Copy, Clone, PartialEq)]
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pub struct Spacing {
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pub amount: Length,
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pub softness: Softness,
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}
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#[async_trait(?Send)]
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impl Layout for Spacing {
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async fn layout(&self, _: &mut LayoutContext, _: LayoutConstraints) -> Vec<Layouted> {
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vec![Layouted::Spacing(self.amount)]
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}
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}
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impl Debug for Spacing {
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fn fmt(&self, f: &mut Formatter) -> fmt::Result {
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match self.softness {
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Softness::Soft => write!(f, "Soft({})", self.amount),
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Softness::Hard => write!(f, "Hard({})", self.amount),
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}
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}
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}
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impl From<Spacing> for LayoutNode {
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fn from(spacing: Spacing) -> Self {
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Self::Spacing(spacing)
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}
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}
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/// Defines how spacing interacts with surrounding spacing.
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///
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/// Hard spacing assures that a fixed amount of spacing will always be inserted.
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/// Soft spacing will be consumed by previous soft spacing or neighbouring hard
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/// spacing and can be used to insert overridable spacing, e.g. between words or
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/// paragraphs.
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#[derive(Debug, Copy, Clone, Eq, PartialEq, Ord, PartialOrd)]
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pub enum Softness {
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/// Soft spacing is not laid out if it directly follows other soft spacing
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/// or if it touches hard spacing.
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Soft,
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/// Hard spacing is always laid out and consumes surrounding soft spacing.
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Hard,
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}
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