From a9869c212f7c1bc77a52e301ad014641b014e834 Mon Sep 17 00:00:00 2001
From: Laurenz <laurmaedje@gmail.com>
Date: Thu, 26 May 2022 13:49:44 +0200
Subject: Locatable groups

---
 src/library/layout/grid.rs   |  4 ++++
 src/library/layout/locate.rs | 14 ++++++++++++++
 src/library/layout/mod.rs    |  2 ++
 3 files changed, 20 insertions(+)
 create mode 100644 src/library/layout/locate.rs

(limited to 'src/library/layout')

diff --git a/src/library/layout/grid.rs b/src/library/layout/grid.rs
index 5b621732..4cad9de6 100644
--- a/src/library/layout/grid.rs
+++ b/src/library/layout/grid.rs
@@ -204,7 +204,9 @@ impl<'a> GridLayouter<'a> {
 
     /// Determines the columns sizes and then layouts the grid row-by-row.
     pub fn layout(mut self) -> TypResult<Vec<Arc<Frame>>> {
+        self.ctx.pins.freeze();
         self.measure_columns()?;
+        self.ctx.pins.unfreeze();
 
         for y in 0 .. self.rows.len() {
             // Skip to next region if current one is full, but only for content
@@ -370,10 +372,12 @@ impl<'a> GridLayouter<'a> {
                     pod.base.x = self.regions.base.x;
                 }
 
+                self.ctx.pins.freeze();
                 let mut sizes = node
                     .layout(self.ctx, &pod, self.styles)?
                     .into_iter()
                     .map(|frame| frame.size.y);
+                self.ctx.pins.unfreeze();
 
                 // For each region, we want to know the maximum height any
                 // column requires.
diff --git a/src/library/layout/locate.rs b/src/library/layout/locate.rs
new file mode 100644
index 00000000..e94a48ba
--- /dev/null
+++ b/src/library/layout/locate.rs
@@ -0,0 +1,14 @@
+use crate::library::prelude::*;
+use crate::model::{Group, LocateNode};
+
+/// Format content with access to its location on the page.
+pub fn locate(_: &mut Machine, args: &mut Args) -> TypResult<Value> {
+    let node = LocateNode::new(args.expect("recipe")?);
+    Ok(Value::Content(Content::Locate(node)))
+}
+
+/// Create a new group of locatable elements.
+pub fn group(_: &mut Machine, args: &mut Args) -> TypResult<Value> {
+    let key = args.expect("key")?;
+    Ok(Value::dynamic(Group::new(key)))
+}
diff --git a/src/library/layout/mod.rs b/src/library/layout/mod.rs
index 588b15aa..6cf5b550 100644
--- a/src/library/layout/mod.rs
+++ b/src/library/layout/mod.rs
@@ -5,6 +5,7 @@ mod columns;
 mod container;
 mod flow;
 mod grid;
+mod locate;
 mod pad;
 mod page;
 mod place;
@@ -16,6 +17,7 @@ pub use columns::*;
 pub use container::*;
 pub use flow::*;
 pub use grid::*;
+pub use locate::*;
 pub use pad::*;
 pub use page::*;
 pub use place::*;
-- 
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