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use crate::layout::{BlockNode, GridLayouter, HNode, ParNode, Sizing, Spacing};
use crate::prelude::*;
use crate::text::{SpaceNode, TextNode};
/// A list of terms and their descriptions.
///
/// Displays a sequence of terms and their descriptions vertically. When the
/// descriptions span over multiple lines, they use hanging indent to
/// communicate the visual hierarchy.
///
/// ## Syntax
/// This function also has dedicated syntax: Starting a line with a slash,
/// followed by a term, a colon and a description creates a term list item.
///
/// ## Example
/// ```example
/// / Ligature: A merged glyph.
/// / Kerning: A spacing adjustment
/// between two adjacent letters.
/// ```
///
/// Display: Term List
/// Category: layout
#[node(Layout)]
pub struct TermsNode {
/// The term list's children.
///
/// When using the term list syntax, adjacent items are automatically
/// collected into term lists, even through constructs like for loops.
///
/// ```example
/// #for year, product in (
/// "1978": "TeX",
/// "1984": "LaTeX",
/// "2019": "Typst",
/// ) [/ #product: Born in #year.]
/// ```
#[variadic]
pub items: Vec<TermItem>,
/// If this is `{false}`, the items are spaced apart with [term list
/// spacing]($func/terms.spacing). If it is `{true}`, they use normal
/// [leading]($func/par.leading) instead. This makes the term list more
/// compact, which can look better if the items are short.
///
/// ```example
/// / Fact: If a term list has a lot
/// of text, and maybe other inline
/// content, it should not be tight
/// anymore.
///
/// / Tip: To make it wide, simply
/// insert a blank line between the
/// items.
/// ```
#[named]
#[default(true)]
pub tight: bool,
/// The indentation of each item's term.
#[settable]
#[resolve]
#[default]
pub indent: Length,
/// The hanging indent of the description.
///
/// ```example
/// #set terms(hanging-indent: 0pt)
/// / Term: This term list does not
/// make use of hanging indents.
/// ```
#[settable]
#[resolve]
#[default(Em::new(1.0).into())]
pub hanging_indent: Length,
/// The spacing between the items of a wide (non-tight) term list.
///
/// If set to `{auto}`, uses the spacing [below blocks]($func/block.below).
#[settable]
#[default]
pub spacing: Smart<Spacing>,
}
impl Layout for TermsNode {
fn layout(
&self,
vt: &mut Vt,
styles: StyleChain,
regions: Regions,
) -> SourceResult<Fragment> {
let indent = styles.get(Self::INDENT);
let body_indent = styles.get(Self::HANGING_INDENT);
let gutter = if self.tight() {
styles.get(ParNode::LEADING).into()
} else {
styles
.get(Self::SPACING)
.unwrap_or_else(|| styles.get(BlockNode::BELOW).amount())
};
let mut cells = vec![];
for item in self.items() {
let body = Content::sequence(vec![
HNode::new((-body_indent).into()).pack(),
(item.term() + TextNode::packed(':')).strong(),
SpaceNode::new().pack(),
item.description(),
]);
cells.push(Content::empty());
cells.push(body);
}
let layouter = GridLayouter::new(
vt,
Axes::with_x(&[Sizing::Rel((indent + body_indent).into()), Sizing::Auto]),
Axes::with_y(&[gutter.into()]),
&cells,
regions,
styles,
);
Ok(layouter.layout()?.fragment)
}
}
/// A term list item.
///
/// Display: Term List Item
/// Category: layout
#[node]
pub struct TermItem {
/// The term described by the list item.
#[positional]
#[required]
pub term: Content,
/// The description of the term.
#[positional]
#[required]
pub description: Content,
}
cast_from_value! {
TermItem,
array: Array => {
let mut iter = array.into_iter();
let (term, description) = match (iter.next(), iter.next(), iter.next()) {
(Some(a), Some(b), None) => (a.cast()?, b.cast()?),
_ => Err("array must contain exactly two entries")?,
};
Self::new(term, description)
},
v: Content => v.to::<Self>().cloned().ok_or("expected term item or array")?,
}
|
