Pull `Checkbox` default constants from its `Renderer`

native/src/renderer/null.rs

@@ -47,9 +47,7 @@ impl row::Renderer for Null {
 }
 
 impl text::Renderer for Null {
-    fn default_size(&self) -> u16 {
+    const DEFAULT_SIZE: u16 = 20;
-        20
-    }
 
     fn measure(
         &self,
@@ -179,9 +177,8 @@ impl radio::Renderer for Null {
 impl checkbox::Renderer for Null {
     type Style = ();
 
-    fn default_size(&self) -> u32 {
+    const DEFAULT_SIZE: u16 = 20;
-        20
+    const DEFAULT_SPACING: u16 = 15;
-    }
 
     fn draw(
         &mut self,

native/src/widget/checkbox.rs

@@ -26,18 +26,20 @@ use crate::{
 ///
 /// ![Checkbox drawn by `iced_wgpu`](https://github.com/hecrj/iced/blob/7760618fb112074bc40b148944521f312152012a/docs/images/checkbox.png?raw=true)
 #[allow(missing_debug_implementations)]
-pub struct Checkbox<Message, Renderer: self::Renderer> {
+pub struct Checkbox<Message, Renderer: self::Renderer + text::Renderer> {
     is_checked: bool,
     on_toggle: Box<dyn Fn(bool) -> Message>,
     label: String,
-    size: u16,
     width: Length,
+    size: u16,
     spacing: u16,
     text_size: u16,
     style: Renderer::Style,
 }
 
-impl<Message, Renderer: self::Renderer> Checkbox<Message, Renderer> {
+impl<Message, Renderer: self::Renderer + text::Renderer>
+    Checkbox<Message, Renderer>
+{
     /// Creates a new [`Checkbox`].
     ///
     /// It expects:
@@ -56,10 +58,10 @@ impl<Message, Renderer: self::Renderer> Checkbox<Message, Renderer> {
             is_checked,
             on_toggle: Box::new(f),
             label: String::from(label),
-            size: 20,
             width: Length::Shrink,
-            spacing: 15,
+            size: <Renderer as self::Renderer>::DEFAULT_SIZE,
-            text_size: 20,
+            spacing: Renderer::DEFAULT_SPACING,
+            text_size: <Renderer as text::Renderer>::DEFAULT_SIZE,
             style: Renderer::Style::default(),
         }
     }
@@ -135,7 +137,8 @@ where
             .push(
                 Text::new(&self.label)
                     .width(self.width)
-                    .size(self.text_size))
+                    .size(self.text_size),
+            )
             .layout(renderer, limits)
     }
 
@@ -217,10 +220,15 @@ pub trait Renderer: crate::Renderer {
     /// The style supported by this renderer.
     type Style: Default;
 
-    /// Returns the default size of a [`Checkbox`].
+    /// The default size of a [`Checkbox`].
     ///
     /// [`Checkbox`]: struct.Checkbox.html
-    fn default_size(&self) -> u32;
+    const DEFAULT_SIZE: u16;
+
+    /// The default spacing of a [`Checkbox`].
+    ///
+    /// [`Checkbox`]: struct.Checkbox.html
+    const DEFAULT_SPACING: u16;
 
     /// Draws a [`Checkbox`].
     ///

native/src/widget/radio.rs

@@ -149,7 +149,7 @@ where
             defaults,
             label_layout.bounds(),
             &self.label,
-            text::Renderer::default_size(renderer),
+            <Renderer as text::Renderer>::DEFAULT_SIZE,
             Font::Default,
             None,
             HorizontalAlignment::Left,

native/src/widget/text.rs

@@ -131,7 +131,7 @@ where
     ) -> layout::Node {
         let limits = limits.width(self.width).height(self.height);
 
-        let size = self.size.unwrap_or(renderer.default_size());
+        let size = self.size.unwrap_or(Renderer::DEFAULT_SIZE);
 
         let bounds = limits.max();
 
@@ -154,7 +154,7 @@ where
             defaults,
             layout.bounds(),
             &self.content,
-            self.size.unwrap_or(renderer.default_size()),
+            self.size.unwrap_or(Renderer::DEFAULT_SIZE),
             self.font,
             self.color,
             self.horizontal_alignment,
@@ -179,10 +179,10 @@ where
 /// [renderer]: ../../renderer/index.html
 /// [`UserInterface`]: ../../struct.UserInterface.html
 pub trait Renderer: crate::Renderer {
-    /// Returns the default size of the [`Text`].
+    /// The default size of [`Text`].
     ///
     /// [`Text`]: struct.Text.html
-    fn default_size(&self) -> u16;
+    const DEFAULT_SIZE: u16;
 
     /// Measures the [`Text`] in the given bounds and returns the minimum
     /// boundaries that can fit the contents.

wgpu/src/renderer/widget/checkbox.rs

@@ -3,14 +3,11 @@ use iced_native::{
     checkbox, HorizontalAlignment, MouseCursor, Rectangle, VerticalAlignment,
 };
 
-const SIZE: f32 = 28.0;
-
 impl checkbox::Renderer for Renderer {
     type Style = Box<dyn StyleSheet>;
 
-    fn default_size(&self) -> u32 {
+    const DEFAULT_SIZE: u16 = 20;
-        SIZE as u32
+    const DEFAULT_SPACING: u16 = 15;
-    }
 
     fn draw(
         &mut self,

wgpu/src/renderer/widget/text.rs

@@ -6,13 +6,8 @@ use iced_native::{
 
 use std::f32;
 
-// TODO: Obtain from renderer configuration
-const DEFAULT_TEXT_SIZE: f32 = 20.0;
-
 impl text::Renderer for Renderer {
-    fn default_size(&self) -> u16 {
+    const DEFAULT_SIZE: u16 = 20;
-        DEFAULT_TEXT_SIZE as u16
-    }
 
     fn measure(
         &self,