Implement styling for `Radio`

9 files changed, 145 insertions, 38 deletions

diff --git a/examples/styling.rs b/examples/styling.rs
index 426e0638..b5600e85 100644
--- a/examples/styling.rs
+++ b/examples/styling.rs
@@ -51,12 +51,15 @@ impl Sandbox for Styling {
         let choose_theme = style::Theme::ALL.iter().fold(
             Column::new().spacing(10).push(Text::new("Choose a theme:")),
             |column, theme| {
-                column.push(Radio::new(
-                    *theme,
-                    &format!("{:?}", theme),
-                    Some(self.theme),
-                    Message::ThemeChanged,
-                ))
+                column.push(
+                    Radio::new(
+                        *theme,
+                        &format!("{:?}", theme),
+                        Some(self.theme),
+                        Message::ThemeChanged,
+                    )
+                    .style(self.theme),
+                )
             },
         );
 
@@ -110,7 +113,7 @@ impl Sandbox for Styling {
 
 mod style {
     use iced::{
-        button, container, progress_bar, scrollable, slider, text_input,
+        button, container, progress_bar, radio, scrollable, slider, text_input,
     };
 
     #[derive(Debug, Clone, Copy, PartialEq, Eq)]
@@ -138,6 +141,15 @@ mod style {
         }
     }
 
+    impl From<Theme> for Box<dyn radio::StyleSheet> {
+        fn from(theme: Theme) -> Self {
+            match theme {
+                Theme::Light => Default::default(),
+                Theme::Dark => dark::Radio.into(),
+            }
+        }
+    }
+
     impl From<Theme> for Box<dyn text_input::StyleSheet> {
         fn from(theme: Theme) -> Self {
             match theme {
@@ -213,8 +225,8 @@ mod style {
 
     mod dark {
         use iced::{
-            button, container, progress_bar, scrollable, slider, text_input,
-            Background, Color,
+            button, container, progress_bar, radio, scrollable, slider,
+            text_input, Background, Color,
         };
 
         const SURFACE: Color = Color::from_rgb(
@@ -255,6 +267,26 @@ mod style {
             }
         }
 
+        pub struct Radio;
+
+        impl radio::StyleSheet for Radio {
+            fn active(&self) -> radio::Style {
+                radio::Style {
+                    background: Background::Color(SURFACE),
+                    dot_color: Color::WHITE,
+                    border_width: 0,
+                    border_color: Color::TRANSPARENT,
+                }
+            }
+
+            fn hovered(&self) -> radio::Style {
+                radio::Style {
+                    background: Background::Color(Color { a: 0.5, ..SURFACE }),
+                    ..self.active()
+                }
+            }
+        }
+
         pub struct TextInput;
 
         impl text_input::StyleSheet for TextInput {
diff --git a/native/src/renderer/null.rs b/native/src/renderer/null.rs
index b721e29e..4fb4f2d5 100644
--- a/native/src/renderer/null.rs
+++ b/native/src/renderer/null.rs
@@ -152,6 +152,8 @@ impl button::Renderer for Null {
 }
 
 impl radio::Renderer for Null {
+    type Style = ();
+
     fn default_size(&self) -> u32 {
         20
     }
@@ -162,6 +164,7 @@ impl radio::Renderer for Null {
         _is_selected: bool,
         _is_mouse_over: bool,
         _label: Self::Output,
+        _style: &Self::Style,
     ) {
     }
 }
diff --git a/native/src/widget/radio.rs b/native/src/widget/radio.rs
index 6ac00770..faf2736c 100644
--- a/native/src/widget/radio.rs
+++ b/native/src/widget/radio.rs
@@ -1,7 +1,7 @@
 //! Create choices using radio buttons.
 use crate::{
     input::{mouse, ButtonState},
-    layout, row, text, Align, Clipboard, Color, Element, Event, Font, Hasher,
+    layout, row, text, Align, Clipboard, Element, Event, Font, Hasher,
     HorizontalAlignment, Layout, Length, Point, Rectangle, Row, Text,
     VerticalAlignment, Widget,
 };
@@ -12,7 +12,8 @@ use std::hash::Hash;
 ///
 /// # Example
 /// ```
-/// # use iced_native::Radio;
+/// # type Radio<Message> =
+/// #     iced_native::Radio<Message, iced_native::renderer::Null>;
 /// #
 /// #[derive(Debug, Clone, Copy, PartialEq, Eq)]
 /// pub enum Choice {
@@ -34,14 +35,14 @@ use std::hash::Hash;
 ///
 /// ![Radio buttons drawn by `iced_wgpu`](https://github.com/hecrj/iced/blob/7760618fb112074bc40b148944521f312152012a/docs/images/radio.png?raw=true)
 #[allow(missing_debug_implementations)]
-pub struct Radio<Message> {
+pub struct Radio<Message, Renderer: self::Renderer> {
     is_selected: bool,
     on_click: Message,
     label: String,
-    label_color: Option<Color>,
+    style: Renderer::Style,
 }
 
-impl<Message> Radio<Message> {
+impl<Message, Renderer: self::Renderer> Radio<Message, Renderer> {
     /// Creates a new [`Radio`] button.
     ///
     /// It expects:
@@ -61,20 +62,20 @@ impl<Message> Radio<Message> {
             is_selected: Some(value) == selected,
             on_click: f(value),
             label: String::from(label),
-            label_color: None,
+            style: Renderer::Style::default(),
         }
     }
 
-    /// Sets the `Color` of the label of the [`Radio`].
+    /// Sets the style of the [`Radio`] button.
     ///
     /// [`Radio`]: struct.Radio.html
-    pub fn label_color<C: Into<Color>>(mut self, color: C) -> Self {
-        self.label_color = Some(color.into());
+    pub fn style(mut self, style: impl Into<Renderer::Style>) -> Self {
+        self.style = style.into();
         self
     }
 }
 
-impl<Message, Renderer> Widget<Message, Renderer> for Radio<Message>
+impl<Message, Renderer> Widget<Message, Renderer> for Radio<Message, Renderer>
 where
     Renderer: self::Renderer + text::Renderer + row::Renderer,
     Message: Clone,
@@ -149,7 +150,7 @@ where
             &self.label,
             text::Renderer::default_size(renderer),
             Font::Default,
-            self.label_color,
+            None,
             HorizontalAlignment::Left,
             VerticalAlignment::Center,
         );
@@ -162,6 +163,7 @@ where
             self.is_selected,
             is_mouse_over,
             label,
+            &self.style,
         )
     }
 
@@ -178,6 +180,8 @@ where
 /// [`Radio`]: struct.Radio.html
 /// [renderer]: ../../renderer/index.html
 pub trait Renderer: crate::Renderer {
+    type Style: Default;
+
     /// Returns the default size of a [`Radio`] button.
     ///
     /// [`Radio`]: struct.Radio.html
@@ -198,16 +202,17 @@ pub trait Renderer: crate::Renderer {
         is_selected: bool,
         is_mouse_over: bool,
         label: Self::Output,
+        style: &Self::Style,
     ) -> Self::Output;
 }
 
-impl<'a, Message, Renderer> From<Radio<Message>>
+impl<'a, Message, Renderer> From<Radio<Message, Renderer>>
     for Element<'a, Message, Renderer>
 where
-    Renderer: self::Renderer + row::Renderer + text::Renderer,
+    Renderer: 'static + self::Renderer + row::Renderer + text::Renderer,
     Message: 'static + Clone,
 {
-    fn from(radio: Radio<Message>) -> Element<'a, Message, Renderer> {
+    fn from(radio: Radio<Message, Renderer>) -> Element<'a, Message, Renderer> {
         Element::new(radio)
     }
 }
diff --git a/src/native.rs b/src/native.rs
index 5a4db8f6..2f2182ff 100644
--- a/src/native.rs
+++ b/src/native.rs
@@ -34,13 +34,13 @@ pub mod widget {
         pub use iced_winit::svg::{Handle, Svg};
     }
 
-    pub use iced_winit::{Checkbox, Radio, Text};
+    pub use iced_winit::{Checkbox, Text};
 
     #[doc(no_inline)]
     pub use {
         button::Button, container::Container, image::Image,
-        progress_bar::ProgressBar, scrollable::Scrollable, slider::Slider,
-        svg::Svg, text_input::TextInput,
+        progress_bar::ProgressBar, radio::Radio, scrollable::Scrollable,
+        slider::Slider, svg::Svg, text_input::TextInput,
     };
 
     /// A container that distributes its contents vertically.
diff --git a/style/src/lib.rs b/style/src/lib.rs
index 3f3dc0b0..991e0644 100644
--- a/style/src/lib.rs
+++ b/style/src/lib.rs
@@ -1,6 +1,7 @@
 pub mod button;
 pub mod container;
 pub mod progress_bar;
+pub mod radio;
 pub mod scrollable;
 pub mod slider;
 pub mod text_input;
diff --git a/style/src/radio.rs b/style/src/radio.rs
new file mode 100644
index 00000000..1f0689b9
--- /dev/null
+++ b/style/src/radio.rs
@@ -0,0 +1,53 @@
+//! Create choices using radio buttons.
+use iced_core::{Background, Color};
+
+/// The appearance of a radio button.
+#[derive(Debug)]
+pub struct Style {
+    pub background: Background,
+    pub dot_color: Color,
+    pub border_width: u16,
+    pub border_color: Color,
+}
+
+/// A set of rules that dictate the style of a radio button.
+pub trait StyleSheet {
+    fn active(&self) -> Style;
+
+    fn hovered(&self) -> Style;
+}
+
+struct Default;
+
+impl StyleSheet for Default {
+    fn active(&self) -> Style {
+        Style {
+            background: Background::Color(Color::from_rgb(0.95, 0.95, 0.95)),
+            dot_color: Color::from_rgb(0.3, 0.3, 0.3),
+            border_width: 1,
+            border_color: Color::from_rgb(0.6, 0.6, 0.6),
+        }
+    }
+
+    fn hovered(&self) -> Style {
+        Style {
+            background: Background::Color(Color::from_rgb(0.90, 0.90, 0.90)),
+            ..self.active()
+        }
+    }
+}
+
+impl std::default::Default for Box<dyn StyleSheet> {
+    fn default() -> Self {
+        Box::new(Default)
+    }
+}
+
+impl<T> From<T> for Box<dyn StyleSheet>
+where
+    T: 'static + StyleSheet,
+{
+    fn from(style: T) -> Self {
+        Box::new(style)
+    }
+}
diff --git a/wgpu/src/renderer/widget/radio.rs b/wgpu/src/renderer/widget/radio.rs
index aa1dbadc..564f066b 100644
--- a/wgpu/src/renderer/widget/radio.rs
+++ b/wgpu/src/renderer/widget/radio.rs
@@ -1,10 +1,12 @@
-use crate::{Primitive, Renderer};
+use crate::{radio::StyleSheet, Primitive, Renderer};
 use iced_native::{radio, Background, Color, MouseCursor, Rectangle};
 
 const SIZE: f32 = 28.0;
 const DOT_SIZE: f32 = SIZE / 2.0;
 
 impl radio::Renderer for Renderer {
+    type Style = Box<dyn StyleSheet>;
+
     fn default_size(&self) -> u32 {
         SIZE as u32
     }
@@ -15,20 +17,20 @@ impl radio::Renderer for Renderer {
         is_selected: bool,
         is_mouse_over: bool,
         (label, _): Self::Output,
+        style_sheet: &Self::Style,
     ) -> Self::Output {
+        let style = if is_mouse_over {
+            style_sheet.hovered()
+        } else {
+            style_sheet.active()
+        };
+
         let radio = Primitive::Quad {
             bounds,
-            background: Background::Color(
-                if is_mouse_over {
-                    [0.90, 0.90, 0.90]
-                } else {
-                    [0.95, 0.95, 0.95]
-                }
-                .into(),
-            ),
+            background: style.background,
             border_radius: (SIZE / 2.0) as u16,
-            border_width: 1,
-            border_color: Color::from_rgb(0.6, 0.6, 0.6),
+            border_width: style.border_width,
+            border_color: style.border_color,
         };
 
         (
@@ -41,7 +43,7 @@ impl radio::Renderer for Renderer {
                             width: bounds.width - DOT_SIZE,
                             height: bounds.height - DOT_SIZE,
                         },
-                        background: Background::Color([0.3, 0.3, 0.3].into()),
+                        background: Background::Color(style.dot_color),
                         border_radius: (DOT_SIZE / 2.0) as u16,
                         border_width: 0,
                         border_color: Color::TRANSPARENT,
diff --git a/wgpu/src/widget.rs b/wgpu/src/widget.rs
index 3f3dc0b0..991e0644 100644
--- a/wgpu/src/widget.rs
+++ b/wgpu/src/widget.rs
@@ -1,6 +1,7 @@
 pub mod button;
 pub mod container;
 pub mod progress_bar;
+pub mod radio;
 pub mod scrollable;
 pub mod slider;
 pub mod text_input;
diff --git a/wgpu/src/widget/radio.rs b/wgpu/src/widget/radio.rs
new file mode 100644
index 00000000..6e5cf042
--- /dev/null
+++ b/wgpu/src/widget/radio.rs
@@ -0,0 +1,10 @@
+//! Create choices using radio buttons.
+use crate::Renderer;
+
+pub use iced_style::radio::{Style, StyleSheet};
+
+/// A circular button representing a choice.
+///
+/// This is an alias of an `iced_native` radio button with an
+/// `iced_wgpu::Renderer`.
+pub type Radio<Message> = iced_native::Radio<Message, Renderer>;