Make `Renderer` immutable in `UserInterface::build`

3 files changed, 5 insertions, 8 deletions

diff --git a/native/src/element.rs b/native/src/element.rs
index 899089b3..bbedd942 100644
--- a/native/src/element.rs
+++ b/native/src/element.rs
@@ -247,10 +247,7 @@ where
         }
     }
 
-    pub(crate) fn compute_layout(
-        &self,
-        renderer: &mut Renderer,
-    ) -> result::Layout {
+    pub(crate) fn compute_layout(&self, renderer: &Renderer) -> result::Layout {
         let node = self.widget.node(renderer);
 
         node.0.compute_layout(geometry::Size::undefined()).unwrap()
diff --git a/native/src/user_interface.rs b/native/src/user_interface.rs
index 44aaf9e3..5675076d 100644
--- a/native/src/user_interface.rs
+++ b/native/src/user_interface.rs
@@ -98,7 +98,7 @@ where
     pub fn build<E: Into<Element<'a, Message, Renderer>>>(
         root: E,
         cache: Cache,
-        renderer: &mut Renderer,
+        renderer: &Renderer,
     ) -> Self {
         let root = root.into();
 
diff --git a/winit/src/application.rs b/winit/src/application.rs
index 2ea52e5f..8345a5ed 100644
--- a/winit/src/application.rs
+++ b/winit/src/application.rs
@@ -41,7 +41,7 @@ pub trait Application {
         let user_interface = UserInterface::build(
             document(&mut self, size),
             Cache::default(),
-            &mut renderer,
+            &renderer,
         );
 
         let mut primitive = user_interface.draw(&mut renderer);
@@ -61,7 +61,7 @@ pub trait Application {
                 let mut user_interface = UserInterface::build(
                     document(&mut self, size),
                     cache.take().unwrap(),
-                    &mut renderer,
+                    &renderer,
                 );
 
                 let messages = user_interface.update(events.drain(..));
@@ -84,7 +84,7 @@ pub trait Application {
                     let user_interface = UserInterface::build(
                         document(&mut self, size),
                         temp_cache,
-                        &mut renderer,
+                        &renderer,
                     );
 
                     primitive = user_interface.draw(&mut renderer);