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Diffstat (limited to 'src/library/columns.rs')
| -rw-r--r-- | src/library/columns.rs | 113 |
1 files changed, 0 insertions, 113 deletions
diff --git a/src/library/columns.rs b/src/library/columns.rs deleted file mode 100644 index 3ce9b6e5..00000000 --- a/src/library/columns.rs +++ /dev/null @@ -1,113 +0,0 @@ -//! Multi-column layouts. - -use super::prelude::*; -use super::ParNode; - -/// Separate a region into multiple equally sized columns. -#[derive(Debug, Hash)] -pub struct ColumnsNode { - /// How many columns there should be. - pub columns: NonZeroUsize, - /// The child to be layouted into the columns. Most likely, this should be a - /// flow or stack node. - pub child: LayoutNode, -} - -#[class] -impl ColumnsNode { - /// The size of the gutter space between each column. - pub const GUTTER: Linear = Relative::new(0.04).into(); - - fn construct(_: &mut Context, args: &mut Args) -> TypResult<Template> { - Ok(Template::block(Self { - columns: args.expect("column count")?, - child: args.expect("body")?, - })) - } -} - -impl Layout for ColumnsNode { - fn layout( - &self, - ctx: &mut Context, - regions: &Regions, - styles: StyleChain, - ) -> TypResult<Vec<Arc<Frame>>> { - // Separating the infinite space into infinite columns does not make - // much sense. - if regions.first.x.is_infinite() { - return self.child.layout(ctx, regions, styles); - } - - // Determine the width of the gutter and each column. - let columns = self.columns.get(); - let gutter = styles.get(Self::GUTTER).resolve(regions.base.x); - let width = (regions.first.x - gutter * (columns - 1) as f64) / columns as f64; - - // Create the pod regions. - let pod = Regions { - first: Size::new(width, regions.first.y), - base: Size::new(width, regions.base.y), - backlog: std::iter::once(®ions.first.y) - .chain(regions.backlog.as_slice()) - .flat_map(|&height| std::iter::repeat(height).take(columns)) - .skip(1) - .collect(), - last: regions.last, - expand: Spec::new(true, regions.expand.y), - }; - - // Layout the children. - let mut frames = self.child.layout(ctx, &pod, styles)?.into_iter(); - - let dir = styles.get(ParNode::DIR); - let total_regions = (frames.len() as f32 / columns as f32).ceil() as usize; - let mut finished = vec![]; - - // Stitch together the columns for each region. - for region in regions.iter().take(total_regions) { - // The height should be the parent height if the node shall expand. - // Otherwise its the maximum column height for the frame. In that - // case, the frame is first created with zero height and then - // resized. - let height = if regions.expand.y { region.y } else { Length::zero() }; - let mut output = Frame::new(Size::new(regions.first.x, height)); - let mut cursor = Length::zero(); - - for _ in 0 .. columns { - let frame = match frames.next() { - Some(frame) => frame, - None => break, - }; - - if !regions.expand.y { - output.size.y.set_max(frame.size.y); - } - - let width = frame.size.x; - let x = if dir.is_positive() { - cursor - } else { - regions.first.x - cursor - width - }; - - output.push_frame(Point::with_x(x), frame); - cursor += width + gutter; - } - - finished.push(Arc::new(output)); - } - - Ok(finished) - } -} - -/// A column break. -pub struct ColbreakNode; - -#[class] -impl ColbreakNode { - fn construct(_: &mut Context, _: &mut Args) -> TypResult<Template> { - Ok(Template::Colbreak) - } -} |
