1 files changed, 78 insertions, 0 deletions
diff --git a/graphics/src/widget/radio.rs b/graphics/src/widget/radio.rs
new file mode 100644
index 00000000..dd8b5f17
--- /dev/null
+++ b/graphics/src/widget/radio.rs
@@ -0,0 +1,78 @@
+//! Create choices using radio buttons.
+use crate::{Backend, Primitive, Renderer};
+use iced_native::mouse;
+use iced_native::radio;
+use iced_native::{Background, Color, Rectangle};
+
+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, Backend> =
+    iced_native::Radio<Message, Renderer<Backend>>;
+
+const SIZE: f32 = 28.0;
+const DOT_SIZE: f32 = SIZE / 2.0;
+
+impl<B> radio::Renderer for Renderer<B>
+where
+    B: Backend,
+{
+    type Style = Box<dyn StyleSheet>;
+
+    const DEFAULT_SIZE: u16 = SIZE as u16;
+    const DEFAULT_SPACING: u16 = 15;
+
+    fn draw(
+        &mut self,
+        bounds: Rectangle,
+        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: style.background,
+            border_radius: (SIZE / 2.0) as u16,
+            border_width: style.border_width,
+            border_color: style.border_color,
+        };
+
+        (
+            Primitive::Group {
+                primitives: if is_selected {
+                    let radio_circle = Primitive::Quad {
+                        bounds: Rectangle {
+                            x: bounds.x + DOT_SIZE / 2.0,
+                            y: bounds.y + DOT_SIZE / 2.0,
+                            width: bounds.width - DOT_SIZE,
+                            height: bounds.height - DOT_SIZE,
+                        },
+                        background: Background::Color(style.dot_color),
+                        border_radius: (DOT_SIZE / 2.0) as u16,
+                        border_width: 0,
+                        border_color: Color::TRANSPARENT,
+                    };
+
+                    vec![radio, radio_circle, label]
+                } else {
+                    vec![radio, label]
+                },
+            },
+            if is_mouse_over {
+                mouse::Interaction::Pointer
+            } else {
+                mouse::Interaction::default()
+            },
+        )
+    }
+}