Draft first-class `Theme` support

RFC: https://github.com/iced-rs/rfcs/pull/6

1 files changed, 12 insertions, 6 deletions

diff --git a/graphics/src/renderer.rs b/graphics/src/renderer.rs
index cb31ea5f..3c19fbfb 100644
--- a/graphics/src/renderer.rs
+++ b/graphics/src/renderer.rs
@@ -10,19 +10,23 @@ use iced_native::{Background, Element, Font, Point, Rectangle, Size};
 
 pub use iced_native::renderer::Style;
 
+use std::marker::PhantomData;
+
 /// A backend-agnostic renderer that supports all the built-in widgets.
 #[derive(Debug)]
-pub struct Renderer<B: Backend> {
+pub struct Renderer<B: Backend, Theme> {
     backend: B,
     primitives: Vec<Primitive>,
+    theme: PhantomData<Theme>,
 }
 
-impl<B: Backend> Renderer<B> {
+impl<B: Backend, T> Renderer<B, T> {
     /// Creates a new [`Renderer`] from the given [`Backend`].
     pub fn new(backend: B) -> Self {
         Self {
             backend,
             primitives: Vec::new(),
+            theme: PhantomData,
         }
     }
 
@@ -43,10 +47,12 @@ impl<B: Backend> Renderer<B> {
     }
 }
 
-impl<B> iced_native::Renderer for Renderer<B>
+impl<B, T> iced_native::Renderer for Renderer<B, T>
 where
     B: Backend,
 {
+    type Theme = T;
+
     fn layout<'a, Message>(
         &mut self,
         element: &Element<'a, Message, Self>,
@@ -114,7 +120,7 @@ where
     }
 }
 
-impl<B> text::Renderer for Renderer<B>
+impl<B, T> text::Renderer for Renderer<B, T>
 where
     B: Backend + backend::Text,
 {
@@ -171,7 +177,7 @@ where
     }
 }
 
-impl<B> image::Renderer for Renderer<B>
+impl<B, T> image::Renderer for Renderer<B, T>
 where
     B: Backend + backend::Image,
 {
@@ -186,7 +192,7 @@ where
     }
 }
 
-impl<B> svg::Renderer for Renderer<B>
+impl<B, T> svg::Renderer for Renderer<B, T>
 where
     B: Backend + backend::Svg,
 {