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