Let a Theme control the text_color of an application

native/src/program/state.rs

@@ -1,4 +1,5 @@
 use crate::mouse;
+use crate::theme;
 use crate::user_interface::{self, UserInterface};
 use crate::{Clipboard, Command, Debug, Event, Point, Program, Size};
 
@@ -19,6 +20,7 @@ where
 impl<P> State<P>
 where
     P: Program + 'static,
+    <P::Renderer as crate::Renderer>::Theme: theme::Definition,
 {
     /// Creates a new [`State`] with the provided [`Program`], initializing its
     /// primitive with the given logical bounds and renderer.
@@ -164,7 +166,10 @@ fn build_user_interface<'a, P: Program>(
     renderer: &mut P::Renderer,
     size: Size,
     debug: &mut Debug,
-) -> UserInterface<'a, P::Message, P::Renderer> {
+) -> UserInterface<'a, P::Message, P::Renderer>
+where
+    <P::Renderer as crate::Renderer>::Theme: theme::Definition,
+{
     debug.view_started();
     let view = program.view();
     debug.view_finished();

native/src/user_interface.rs

@@ -3,6 +3,7 @@ use crate::event::{self, Event};
 use crate::layout;
 use crate::mouse;
 use crate::renderer;
+use crate::theme::{self, Definition as _};
 use crate::{Clipboard, Element, Layout, Point, Rectangle, Shell, Size};
 
 /// A set of interactive graphical elements with a specific [`Layout`].
@@ -28,6 +29,7 @@ pub struct UserInterface<'a, Message, Renderer> {
 impl<'a, Message, Renderer> UserInterface<'a, Message, Renderer>
 where
     Renderer: crate::Renderer,
+    Renderer::Theme: theme::Definition,
 {
     /// Builds a user interface for an [`Element`].
     ///
@@ -370,7 +372,9 @@ where
         self.root.widget.draw(
             renderer,
             theme,
-            &renderer::Style::default(),
+            &renderer::Style {
+                text_color: theme.text_color(),
+            },
             Layout::new(&self.base),
             base_cursor,
             &viewport,