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https://github.com/typst/typst
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Refactor paragraph layout 📰
This commit is contained in:
Laurenz
parent
607f4395f9
commit
1b3eb42003
@ -1,55 +1,36 @@
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use super::*;
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/// A node that arranges its children into a paragraph.
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///
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/// Boxes are laid out along the cross axis as long as they fit into a line.
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/// When necessary, a line break is inserted and the new line is offset along
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/// the main axis by the height of the previous line plus extra line spacing.
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#[derive(Debug, Clone, PartialEq)]
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pub struct Par {
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/// The `main` and `cross` directions of this paragraph.
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///
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/// The children are placed in lines along the `cross` direction. The lines
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/// are stacked along the `main` direction.
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pub dirs: Gen<Dir>,
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pub line_spacing: Length,
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pub children: Vec<LayoutNode>,
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/// How to align _this_ paragraph in _its_ parent.
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pub aligns: Gen<Align>,
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pub expand: Spec<bool>,
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/// Whether to expand the cross axis to fill the area or to fit the content.
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pub cross_expansion: Expansion,
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/// The spacing to insert after each line.
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pub line_spacing: Length,
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/// The nodes to be arranged in a paragraph.
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pub children: Vec<LayoutNode>,
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}
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#[async_trait(?Send)]
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impl Layout for Par {
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async fn layout(
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&self,
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ctx: &mut LayoutContext,
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constraints: LayoutConstraints,
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) -> Vec<Layouted> {
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let mut layouter = LineLayouter::new(LineContext {
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dirs: self.dirs,
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spaces: constraints.spaces,
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repeat: constraints.repeat,
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line_spacing: self.line_spacing,
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expand: self.expand,
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});
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async fn layout(&self, ctx: &mut LayoutContext, areas: &Areas) -> Vec<Layouted> {
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let mut layouter = ParLayouter::new(self, areas.clone());
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for child in &self.children {
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let items = child
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.layout(ctx, LayoutConstraints {
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spaces: layouter.remaining(),
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repeat: constraints.repeat,
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})
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.await;
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for item in items {
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match item {
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Layouted::Spacing(amount) => layouter.push_spacing(amount),
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Layouted::Box(boxed, aligns) => layouter.push_box(boxed, aligns),
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for layouted in child.layout(ctx, &layouter.areas).await {
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match layouted {
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Layouted::Spacing(spacing) => layouter.spacing(spacing),
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Layouted::Boxed(boxed, aligns) => layouter.boxed(boxed, aligns.cross),
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}
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}
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}
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layouter
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.finish()
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.into_iter()
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.map(|boxed| Layouted::Box(boxed, self.aligns))
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.collect()
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layouter.finish()
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}
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}
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@ -59,447 +40,145 @@ impl From<Par> for LayoutNode {
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}
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}
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/// Performs the line layouting.
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struct LineLayouter {
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/// The context used for line layouting.
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ctx: LineContext,
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/// The underlying layouter that stacks the finished lines.
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stack: StackLayouter,
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/// The in-progress line.
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run: LineRun,
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}
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/// The context for line layouting.
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#[derive(Debug, Clone)]
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struct LineContext {
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/// The layout directions.
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struct ParLayouter<'a> {
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par: &'a Par,
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main: SpecAxis,
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cross: SpecAxis,
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dirs: Gen<Dir>,
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/// The spaces to layout into.
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spaces: Vec<LayoutSpace>,
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/// Whether to spill over into copies of the last space or finish layouting
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/// when the last space is used up.
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repeat: bool,
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/// The spacing to be inserted between each pair of lines.
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line_spacing: Length,
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/// Whether to expand the size of the resulting layout to the full size of
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/// this space or to shrink it to fit the content.
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expand: Spec<bool>,
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areas: Areas,
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layouted: Vec<Layouted>,
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lines: Vec<(Length, BoxLayout, Align)>,
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lines_size: Gen<Length>,
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run: Vec<(Length, BoxLayout, Align)>,
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run_size: Gen<Length>,
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run_ruler: Align,
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}
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impl LineLayouter {
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/// Create a new line layouter.
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fn new(ctx: LineContext) -> Self {
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impl<'a> ParLayouter<'a> {
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fn new(par: &'a Par, areas: Areas) -> Self {
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Self {
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stack: StackLayouter::new(StackContext {
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spaces: ctx.spaces.clone(),
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dirs: ctx.dirs,
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repeat: ctx.repeat,
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expand: ctx.expand,
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}),
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ctx,
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run: LineRun::new(),
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par,
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main: par.dirs.main.axis(),
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cross: par.dirs.cross.axis(),
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dirs: par.dirs,
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areas,
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layouted: vec![],
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lines: vec![],
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lines_size: Gen::ZERO,
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run: vec![],
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run_size: Gen::ZERO,
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run_ruler: Align::Start,
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}
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}
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/// Add a layout.
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fn push_box(&mut self, layout: BoxLayout, aligns: Gen<Align>) {
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let dirs = self.ctx.dirs;
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if let Some(prev) = self.run.aligns {
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if aligns.main != prev.main {
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// TODO: Issue warning for non-fitting alignment in
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// non-repeating context.
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let fitting = aligns.main >= self.stack.space.allowed_align;
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if !fitting && self.ctx.repeat {
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self.finish_space(true);
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fn spacing(&mut self, amount: Length) {
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let cross_full = self.areas.current.rem.get(self.cross);
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self.run_size.cross = (self.run_size.cross + amount).min(cross_full);
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}
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fn boxed(&mut self, layout: BoxLayout, align: Align) {
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if self.run_ruler > align {
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self.finish_run();
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}
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let fits = {
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let mut usable = self.areas.current.rem;
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*usable.get_mut(self.cross) -= self.run_size.cross;
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usable.fits(layout.size)
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};
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if !fits {
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self.finish_run();
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while !self.areas.current.rem.fits(layout.size) {
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if self.areas.in_full_last() {
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// TODO: Diagnose once the necessary spans exist.
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let _ = warning!("cannot fit box into any area");
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break;
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} else {
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self.finish_line();
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self.finish_area();
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}
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}
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}
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} else if aligns.cross < prev.cross {
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self.finish_line();
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} else if aligns.cross > prev.cross {
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let usable = self.stack.usable().get(dirs.cross.axis());
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let mut rest_run = LineRun::new();
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rest_run.size.main = self.run.size.main;
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let size = layout.size.switch(self.dirs);
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self.run.push((self.run_size.cross, layout, align));
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// FIXME: Alignment in non-expanding parent.
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rest_run.usable = Some(match aligns.cross {
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Align::Start => unreachable!("start > x"),
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Align::Center => usable - 2.0 * self.run.size.cross,
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Align::End => usable - self.run.size.cross,
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self.run_size.cross += size.cross;
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self.run_size.main = self.run_size.main.max(size.main);
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self.run_ruler = align;
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}
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fn finish_run(&mut self) {
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let size = Gen::new(self.run_size.main, match self.par.cross_expansion {
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Expansion::Fill => self.areas.current.full.get(self.cross),
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Expansion::Fit => self.run_size.cross,
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});
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self.finish_line();
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let mut output = BoxLayout::new(size.switch(self.dirs).to_size());
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// Move back up in the stack layouter.
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self.stack.push_spacing(-rest_run.size.main - self.ctx.line_spacing);
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self.run = rest_run;
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}
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}
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for (before, layout, align) in std::mem::take(&mut self.run) {
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let child_cross_size = layout.size.get(self.cross);
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let size = layout.size.switch(dirs);
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let usable = self.usable();
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if usable.main < size.main || usable.cross < size.cross {
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if !self.line_is_empty() {
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self.finish_line();
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}
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// TODO: Issue warning about overflow if there is overflow.
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let usable = self.usable();
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if usable.main < size.main || usable.cross < size.cross {
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self.stack.skip_to_fitting_space(layout.size);
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}
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}
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self.run.aligns = Some(aligns);
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self.run.layouts.push((self.run.size.cross, layout));
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self.run.size.cross += size.cross;
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self.run.size.main = self.run.size.main.max(size.main);
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}
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/// Add spacing to the line.
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fn push_spacing(&mut self, mut spacing: Length) {
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spacing = spacing.min(self.usable().cross);
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self.run.size.cross += spacing;
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}
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/// The remaining usable size of the line.
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///
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/// This specifies how much more would fit before a line break would be
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/// needed.
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fn usable(&self) -> Gen<Length> {
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// The base is the usable space of the stack layouter.
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let mut usable = self.stack.usable().switch(self.ctx.dirs);
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// If there was another run already, override the stack's size.
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if let Some(cross) = self.run.usable {
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usable.cross = cross;
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}
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usable.cross -= self.run.size.cross;
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usable
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}
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/// The remaining inner spaces. If something is laid out into these spaces,
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/// it will fit into this layouter's underlying stack.
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fn remaining(&self) -> Vec<LayoutSpace> {
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let mut spaces = self.stack.remaining();
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*spaces[0].size.get_mut(self.ctx.dirs.main.axis()) -= self.run.size.main;
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spaces
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}
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/// Whether the currently set line is empty.
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fn line_is_empty(&self) -> bool {
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self.run.size == Gen::ZERO && self.run.layouts.is_empty()
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}
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/// Finish everything up and return the final collection of boxes.
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fn finish(mut self) -> Vec<BoxLayout> {
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self.finish_line_if_not_empty();
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self.stack.finish()
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}
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/// Finish the active space and start a new one.
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///
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/// At the top level, this is a page break.
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fn finish_space(&mut self, hard: bool) {
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self.finish_line_if_not_empty();
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self.stack.finish_space(hard)
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}
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/// Finish the active line and start a new one.
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fn finish_line(&mut self) {
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let dirs = self.ctx.dirs;
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let mut layout = BoxLayout::new(self.run.size.switch(dirs).to_size());
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let aligns = self.run.aligns.unwrap_or_default();
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let children = std::mem::take(&mut self.run.layouts);
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for (offset, child) in children {
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let cross = if dirs.cross.is_positive() {
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offset
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// Position along the cross axis.
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let cross = align.apply(if self.dirs.cross.is_positive() {
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let after_with_self = self.run_size.cross - before;
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before .. size.cross - after_with_self
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} else {
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self.run.size.cross - offset - child.size.get(dirs.cross.axis())
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};
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let before_with_self = before + child_cross_size;
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let after = self.run_size.cross - (before + child_cross_size);
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size.cross - before_with_self .. after
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});
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let pos = Gen::new(Length::ZERO, cross).switch(dirs).to_point();
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layout.push_layout(pos, child);
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let pos = Gen::new(Length::ZERO, cross).switch(self.dirs).to_point();
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output.push_layout(pos, layout);
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}
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self.stack.push_box(layout, aligns);
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self.stack.push_spacing(self.ctx.line_spacing);
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self.run = LineRun::new();
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self.lines.push((self.lines_size.main, output, self.run_ruler));
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let main_offset = size.main + self.par.line_spacing;
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*self.areas.current.rem.get_mut(self.main) -= main_offset;
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self.lines_size.main += main_offset;
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self.lines_size.cross = self.lines_size.cross.max(size.cross);
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self.run_size = Gen::ZERO;
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self.run_ruler = Align::Start;
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}
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fn finish_line_if_not_empty(&mut self) {
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if !self.line_is_empty() {
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self.finish_line()
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}
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}
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}
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fn finish_area(&mut self) {
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let size = self.lines_size;
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let mut output = BoxLayout::new(size.switch(self.dirs).to_size());
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/// A sequence of boxes with the same alignment. A real line can consist of
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/// multiple runs with different alignments.
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struct LineRun {
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/// The so-far accumulated items of the run.
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layouts: Vec<(Length, BoxLayout)>,
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/// The summed width and maximal height of the run.
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size: Gen<Length>,
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/// The alignment of all layouts in the line.
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///
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/// When a new run is created the alignment is yet to be determined and
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/// `None` as such. Once a layout is added, its alignment decides the
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/// alignment for the whole run.
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aligns: Option<Gen<Align>>,
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/// The amount of cross-space left by another run on the same line or `None`
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/// if this is the only run so far.
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usable: Option<Length>,
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}
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for (before, run, cross_align) in std::mem::take(&mut self.lines) {
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let child_size = run.size.switch(self.dirs);
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impl LineRun {
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fn new() -> Self {
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Self {
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layouts: vec![],
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size: Gen::ZERO,
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aligns: None,
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usable: None,
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}
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}
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}
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/// Performs the stack layouting.
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pub(super) struct StackLayouter {
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/// The context used for stack layouting.
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pub ctx: StackContext,
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/// The finished layouts.
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pub layouts: Vec<BoxLayout>,
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/// The in-progress space.
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pub space: Space,
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}
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/// The context for stack layouting.
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#[derive(Debug, Clone)]
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pub(super) struct StackContext {
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/// The layouting directions.
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pub dirs: Gen<Dir>,
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/// The spaces to layout into.
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pub spaces: Vec<LayoutSpace>,
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/// Whether to spill over into copies of the last space or finish layouting
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/// when the last space is used up.
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pub repeat: bool,
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/// Whether to expand the size of the resulting layout to the full size of
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/// this space or to shrink it to fit the content.
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pub expand: Spec<bool>,
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}
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impl StackLayouter {
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/// Create a new stack layouter.
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pub fn new(ctx: StackContext) -> Self {
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let space = ctx.spaces[0];
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Self {
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ctx,
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layouts: vec![],
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space: Space::new(0, true, space.size),
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}
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}
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/// Add a layout to the stack.
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pub fn push_box(&mut self, layout: BoxLayout, aligns: Gen<Align>) {
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// If the alignment cannot be fitted in this space, finish it.
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//
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// TODO: Issue warning for non-fitting alignment in non-repeating
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// context.
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if aligns.main < self.space.allowed_align && self.ctx.repeat {
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self.finish_space(true);
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}
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// TODO: Issue warning about overflow if there is overflow in a
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// non-repeating context.
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if !self.space.usable.fits(layout.size) && self.ctx.repeat {
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self.skip_to_fitting_space(layout.size);
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}
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// Change the usable space and size of the space.
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self.update_metrics(layout.size.switch(self.ctx.dirs));
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// Add the box to the vector and remember that spacings are allowed
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// again.
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self.space.layouts.push((layout, aligns));
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self.space.allowed_align = aligns.main;
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}
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/// Add spacing to the stack.
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pub fn push_spacing(&mut self, mut spacing: Length) {
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// Reduce the spacing such that it definitely fits.
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let axis = self.ctx.dirs.main.axis();
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spacing = spacing.min(self.space.usable.get(axis));
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let size = Gen::new(spacing, Length::ZERO);
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self.update_metrics(size);
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self.space.layouts.push((
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BoxLayout::new(size.switch(self.ctx.dirs).to_size()),
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Gen::default(),
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));
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}
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fn update_metrics(&mut self, added: Gen<Length>) {
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let mut used = self.space.used.switch(self.ctx.dirs);
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used.cross = used.cross.max(added.cross);
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used.main += added.main;
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self.space.used = used.switch(self.ctx.dirs).to_size();
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*self.space.usable.get_mut(self.ctx.dirs.main.axis()) -= added.main;
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}
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/// Move to the first space that can fit the given size or do nothing
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/// if no space is capable of that.
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pub fn skip_to_fitting_space(&mut self, size: Size) {
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let start = self.next_space();
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for (index, space) in self.ctx.spaces[start ..].iter().enumerate() {
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if space.size.fits(size) {
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self.finish_space(true);
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self.start_space(start + index, true);
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break;
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}
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}
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}
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|
||||
/// The remaining inner spaces. If something is laid out into these spaces,
|
||||
/// it will fit into this stack.
|
||||
pub fn remaining(&self) -> Vec<LayoutSpace> {
|
||||
let mut spaces = vec![LayoutSpace {
|
||||
base: self.space.size,
|
||||
size: self.space.usable,
|
||||
}];
|
||||
|
||||
spaces.extend(&self.ctx.spaces[self.next_space() ..]);
|
||||
spaces
|
||||
}
|
||||
|
||||
/// The remaining usable size.
|
||||
pub fn usable(&self) -> Size {
|
||||
self.space.usable
|
||||
}
|
||||
|
||||
/// Whether the current layout space is empty.
|
||||
pub fn space_is_empty(&self) -> bool {
|
||||
self.space.used == Size::ZERO && self.space.layouts.is_empty()
|
||||
}
|
||||
|
||||
/// Finish everything up and return the final collection of boxes.
|
||||
pub fn finish(mut self) -> Vec<BoxLayout> {
|
||||
if self.space.hard || !self.space_is_empty() {
|
||||
self.finish_space(false);
|
||||
}
|
||||
self.layouts
|
||||
}
|
||||
|
||||
/// Finish active current space and start a new one.
|
||||
pub fn finish_space(&mut self, hard: bool) {
|
||||
let dirs = self.ctx.dirs;
|
||||
let main = dirs.main.axis();
|
||||
|
||||
let space = self.ctx.spaces[self.space.index];
|
||||
let layout_size = {
|
||||
let mut used_size = self.space.used;
|
||||
if self.ctx.expand.horizontal {
|
||||
used_size.width = space.size.width;
|
||||
}
|
||||
if self.ctx.expand.vertical {
|
||||
used_size.height = space.size.height;
|
||||
}
|
||||
used_size
|
||||
};
|
||||
|
||||
let mut sum = Length::ZERO;
|
||||
let mut sums = Vec::with_capacity(self.space.layouts.len() + 1);
|
||||
|
||||
for (boxed, _) in &self.space.layouts {
|
||||
sums.push(sum);
|
||||
sum += boxed.size.get(main);
|
||||
}
|
||||
|
||||
sums.push(sum);
|
||||
|
||||
let mut layout = BoxLayout::new(layout_size);
|
||||
let used = layout_size.switch(dirs);
|
||||
|
||||
let children = std::mem::take(&mut self.space.layouts);
|
||||
for (i, (boxed, aligns)) in children.into_iter().enumerate() {
|
||||
let size = boxed.size.switch(dirs);
|
||||
|
||||
let before = sums[i];
|
||||
let after = sum - sums[i + 1];
|
||||
let main_len = used.main - size.main;
|
||||
let main_range = if dirs.main.is_positive() {
|
||||
before .. main_len - after
|
||||
// Position along the main axis.
|
||||
let main = if self.dirs.main.is_positive() {
|
||||
before
|
||||
} else {
|
||||
main_len - before .. after
|
||||
size.main - (before + child_size.main)
|
||||
};
|
||||
|
||||
let cross_len = used.cross - size.cross;
|
||||
let cross_range = if dirs.cross.is_positive() {
|
||||
Length::ZERO .. cross_len
|
||||
// Align along the cross axis.
|
||||
let cross = cross_align.apply(if self.dirs.cross.is_positive() {
|
||||
Length::ZERO .. size.cross - child_size.cross
|
||||
} else {
|
||||
cross_len .. Length::ZERO
|
||||
};
|
||||
size.cross - child_size.cross .. Length::ZERO
|
||||
});
|
||||
|
||||
let main = aligns.main.apply(main_range);
|
||||
let cross = aligns.cross.apply(cross_range);
|
||||
let pos = Gen::new(main, cross).switch(dirs).to_point();
|
||||
|
||||
layout.push_layout(pos, boxed);
|
||||
let pos = Gen::new(main, cross).switch(self.dirs).to_point();
|
||||
output.push_layout(pos, run);
|
||||
}
|
||||
|
||||
self.layouts.push(layout);
|
||||
self.layouted.push(Layouted::Boxed(output, self.par.aligns));
|
||||
|
||||
// ------------------------------------------------------------------ //
|
||||
// Step 5: Start the next space.
|
||||
|
||||
self.start_space(self.next_space(), hard)
|
||||
self.areas.next();
|
||||
self.lines_size = Gen::ZERO;
|
||||
}
|
||||
|
||||
fn start_space(&mut self, index: usize, hard: bool) {
|
||||
let space = self.ctx.spaces[index];
|
||||
self.space = Space::new(index, hard, space.size);
|
||||
}
|
||||
|
||||
fn next_space(&self) -> usize {
|
||||
(self.space.index + 1).min(self.ctx.spaces.len() - 1)
|
||||
}
|
||||
}
|
||||
|
||||
/// A layout space composed of subspaces which can have different directions and
|
||||
/// alignments.
|
||||
#[derive(Debug)]
|
||||
pub(super) struct Space {
|
||||
/// The index of this space in `ctx.spaces`.
|
||||
index: usize,
|
||||
/// Whether to include a layout for this space even if it would be empty.
|
||||
hard: bool,
|
||||
/// The so-far accumulated layouts.
|
||||
layouts: Vec<(BoxLayout, Gen<Align>)>,
|
||||
/// The full size of this space.
|
||||
size: Size,
|
||||
/// The used size of this space.
|
||||
used: Size,
|
||||
/// The remaining space.
|
||||
usable: Size,
|
||||
/// Which alignments for new boxes are still allowed.
|
||||
pub(super) allowed_align: Align,
|
||||
}
|
||||
|
||||
impl Space {
|
||||
fn new(index: usize, hard: bool, size: Size) -> Self {
|
||||
Self {
|
||||
index,
|
||||
hard,
|
||||
layouts: vec![],
|
||||
size,
|
||||
used: Size::ZERO,
|
||||
usable: size,
|
||||
allowed_align: Align::Start,
|
||||
}
|
||||
fn finish(mut self) -> Vec<Layouted> {
|
||||
self.finish_run();
|
||||
self.finish_area();
|
||||
self.layouted
|
||||
}
|
||||
}
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user