From d02f8c33a8f62cdbb94ca12ea8ccded2b7916009 Mon Sep 17 00:00:00 2001
From: Tobias Schmitz <tobiasschmitz2001@gmail.com>
Date: Wed, 7 May 2025 16:19:01 +0200
Subject: [PATCH] feat: make LinkElem::box_outset configurable

---
 crates/typst-layout/src/modifiers.rs   | 14 +++++++++++---
 crates/typst-library/src/model/link.rs |  9 ++++++++-
 2 files changed, 19 insertions(+), 4 deletions(-)

diff --git a/crates/typst-layout/src/modifiers.rs b/crates/typst-layout/src/modifiers.rs
index ac5f40b04..49fa627c3 100644
--- a/crates/typst-layout/src/modifiers.rs
+++ b/crates/typst-layout/src/modifiers.rs
@@ -1,5 +1,7 @@
 use typst_library::foundations::StyleChain;
-use typst_library::layout::{Fragment, Frame, FrameItem, HideElem, Point};
+use typst_library::layout::{
+    Abs, Fragment, Frame, FrameItem, HideElem, Point, Rel, Sides,
+};
 use typst_library::model::{Destination, LinkElem};
 
 /// Frame-level modifications resulting from styles that do not impose any
@@ -21,6 +23,8 @@ use typst_library::model::{Destination, LinkElem};
 pub struct FrameModifiers {
     /// A destination to link to.
     dest: Option<Destination>,
+    /// Outset of the link box to [`Self::dest`].
+    link_box_outset: Sides<Option<Rel<Abs>>>,
     /// Whether the contents of the frame should be hidden.
     hidden: bool,
 }
@@ -30,6 +34,7 @@ impl FrameModifiers {
     pub fn get_in(styles: StyleChain) -> Self {
         Self {
             dest: LinkElem::current_in(styles),
+            link_box_outset: LinkElem::box_outset_in(styles),
             hidden: HideElem::hidden_in(styles),
         }
     }
@@ -53,8 +58,11 @@ pub trait FrameModify {
 impl FrameModify for Frame {
     fn modify(&mut self, modifiers: &FrameModifiers) {
         if let Some(dest) = &modifiers.dest {
-            let size = self.size();
-            self.push(Point::zero(), FrameItem::Link(dest.clone(), size));
+            let mut size = self.size();
+            let outset = modifiers.link_box_outset.unwrap_or_default().relative_to(size);
+            size += outset.sum_by_axis();
+            let pos = Point::new(-outset.left, -outset.top);
+            self.push(pos, FrameItem::Link(dest.clone(), size));
         }
 
         if modifiers.hidden {
diff --git a/crates/typst-library/src/model/link.rs b/crates/typst-library/src/model/link.rs
index ea85aa945..c5c84222a 100644
--- a/crates/typst-library/src/model/link.rs
+++ b/crates/typst-library/src/model/link.rs
@@ -10,7 +10,7 @@ use crate::foundations::{
 };
 use crate::html::{attr, tag, HtmlElem};
 use crate::introspection::Location;
-use crate::layout::Position;
+use crate::layout::{Em, Length, Position, Rel, Sides};
 use crate::text::TextElem;
 
 /// Links to a URL or a location in the document.
@@ -93,6 +93,13 @@ pub struct LinkElem {
     #[internal]
     #[ghost]
     pub current: Option<Destination>,
+
+    /// How much to expand the link box size without affecting the layout. See
+    /// the [box's documentation]($box.outset) for more details.
+    #[resolve]
+    #[fold]
+    #[default(Sides::splat(Some(Em::new(0.25).into())))]
+    pub box_outset: Sides<Option<Rel<Length>>>,
 }
 
 impl LinkElem {