Make `iced_core::Button` customizable

Now it supports:
  - Any kind of content
  - Custom border radius
  - Custom background

1 files changed, 2 insertions, 2 deletions

diff --git a/native/src/widget/checkbox.rs b/native/src/widget/checkbox.rs
index 1954305a..c069bfdc 100644
--- a/native/src/widget/checkbox.rs
+++ b/native/src/widget/checkbox.rs
@@ -10,7 +10,7 @@ impl<Message, Renderer> Widget<Message, Renderer> for Checkbox<Message>
 where
     Renderer: self::Renderer,
 {
-    fn node(&self, renderer: &mut Renderer) -> Node {
+    fn node(&self, renderer: &Renderer) -> Node {
         renderer.node(&self)
     }
 
@@ -64,7 +64,7 @@ pub trait Renderer: crate::Renderer {
     ///
     /// [`Node`]: ../../struct.Node.html
     /// [`Checkbox`]: struct.Checkbox.html
-    fn node<Message>(&mut self, checkbox: &Checkbox<Message>) -> Node;
+    fn node<Message>(&self, checkbox: &Checkbox<Message>) -> Node;
 
     /// Draws a [`Checkbox`].
     ///