Placed node

1 files changed, 39 insertions, 0 deletions

diff --git a/src/library/placed.rs b/src/library/placed.rs
new file mode 100644
index 00000000..0d92fc35
--- /dev/null
+++ b/src/library/placed.rs
@@ -0,0 +1,39 @@
+use super::parse_aligns;
+use super::prelude::*;
+
+/// `place`: Place content at an absolute position.
+pub fn place(_: &mut EvalContext, args: &mut Args) -> TypResult<Value> {
+    let Spec { x, y } = parse_aligns(args)?;
+    let dx = args.named("dx")?;
+    let dy = args.named("dy")?;
+    let body: Template = args.expect("body")?;
+    Ok(Value::Template(Template::from_block(move |style| {
+        PlacedNode {
+            child: body
+                .pack(style)
+                .moved(dx, dy)
+                .aligned(Some(x.unwrap_or(Align::Left)), y),
+        }
+    })))
+}
+
+/// A node that places its child out-of-flow.
+#[derive(Debug, Hash)]
+pub struct PlacedNode {
+    /// The node to be placed.
+    pub child: PackedNode,
+}
+
+impl Layout for PlacedNode {
+    fn layout(
+        &self,
+        ctx: &mut LayoutContext,
+        regions: &Regions,
+    ) -> Vec<Constrained<Rc<Frame>>> {
+        let mut frames = self.child.layout(ctx, regions);
+        for frame in frames.iter_mut() {
+            Rc::make_mut(&mut frame.item).size = Size::zero();
+        }
+        frames
+    }
+}