Implement styling for `Checkbox`

9 files changed, 180 insertions, 46 deletions

diff --git a/examples/styling.rs b/examples/styling.rs
index b5600e85..97095cff 100644
--- a/examples/styling.rs
+++ b/examples/styling.rs
@@ -1,7 +1,7 @@
 use iced::{
-    button, scrollable, slider, text_input, Button, Column, Container, Element,
-    Length, ProgressBar, Radio, Row, Sandbox, Scrollable, Settings, Slider,
-    Text, TextInput,
+    button, scrollable, slider, text_input, Button, Checkbox, Column,
+    Container, Element, Length, ProgressBar, Radio, Row, Sandbox, Scrollable,
+    Settings, Slider, Text, TextInput,
 };
 
 pub fn main() {
@@ -17,6 +17,7 @@ struct Styling {
     button: button::State,
     slider: slider::State,
     slider_value: f32,
+    debug: bool,
 }
 
 #[derive(Debug, Clone)]
@@ -25,6 +26,7 @@ enum Message {
     InputChanged(String),
     ButtonPressed,
     SliderChanged(f32),
+    DebugToggled(bool),
 }
 
 impl Sandbox for Styling {
@@ -44,6 +46,7 @@ impl Sandbox for Styling {
             Message::InputChanged(value) => self.input_value = value,
             Message::ButtonPressed => (),
             Message::SliderChanged(value) => self.slider_value = value,
+            Message::DebugToggled(debug) => self.debug = debug,
         }
     }
 
@@ -89,18 +92,34 @@ impl Sandbox for Styling {
         let progress_bar =
             ProgressBar::new(0.0..=100.0, self.slider_value).style(self.theme);
 
-        let content = Column::new()
+        let checkbox = Checkbox::new(
+            self.debug,
+            "Enable layout debugger",
+            Message::DebugToggled,
+        )
+        .style(self.theme);
+
+        let content: Element<_> = Column::new()
             .spacing(20)
             .padding(20)
             .max_width(600)
             .push(choose_theme)
             .push(Row::new().spacing(10).push(text_input).push(button))
             .push(slider)
-            .push(progress_bar);
-
-        let scrollable = Scrollable::new(&mut self.scroll)
-            .style(self.theme)
-            .push(Container::new(content).width(Length::Fill).center_x());
+            .push(progress_bar)
+            .push(checkbox)
+            .into();
+
+        let scrollable =
+            Scrollable::new(&mut self.scroll).style(self.theme).push(
+                Container::new(if self.debug {
+                    content.explain(self.theme.debug_color())
+                } else {
+                    content
+                })
+                .width(Length::Fill)
+                .center_x(),
+            );
 
         Container::new(scrollable)
             .width(Length::Fill)
@@ -113,7 +132,8 @@ impl Sandbox for Styling {
 
 mod style {
     use iced::{
-        button, container, progress_bar, radio, scrollable, slider, text_input,
+        button, checkbox, container, progress_bar, radio, scrollable, slider,
+        text_input, Color,
     };
 
     #[derive(Debug, Clone, Copy, PartialEq, Eq)]
@@ -124,6 +144,13 @@ mod style {
 
     impl Theme {
         pub const ALL: [Theme; 2] = [Theme::Light, Theme::Dark];
+
+        pub fn debug_color(&self) -> Color {
+            match self {
+                Theme::Light => Color::BLACK,
+                Theme::Dark => Color::WHITE,
+            }
+        }
     }
 
     impl Default for Theme {
@@ -195,6 +222,15 @@ mod style {
         }
     }
 
+    impl From<Theme> for Box<dyn checkbox::StyleSheet> {
+        fn from(theme: Theme) -> Self {
+            match theme {
+                Theme::Light => Default::default(),
+                Theme::Dark => dark::Checkbox.into(),
+            }
+        }
+    }
+
     mod light {
         use iced::{button, Background, Color, Vector};
 
@@ -225,8 +261,8 @@ mod style {
 
     mod dark {
         use iced::{
-            button, container, progress_bar, radio, scrollable, slider,
-            text_input, Background, Color,
+            button, checkbox, container, progress_bar, radio, scrollable,
+            slider, text_input, Background, Color,
         };
 
         const SURFACE: Color = Color::from_rgb(
@@ -432,5 +468,26 @@ mod style {
                 }
             }
         }
+
+        pub struct Checkbox;
+
+        impl checkbox::StyleSheet for Checkbox {
+            fn active(&self) -> checkbox::Style {
+                checkbox::Style {
+                    background: Background::Color(SURFACE),
+                    checkmark_color: Color::WHITE,
+                    border_radius: 2,
+                    border_width: 0,
+                    border_color: Color::TRANSPARENT,
+                }
+            }
+
+            fn hovered(&self) -> checkbox::Style {
+                checkbox::Style {
+                    background: Background::Color(Color { a: 0.5, ..SURFACE }),
+                    ..self.active()
+                }
+            }
+        }
     }
 }
diff --git a/native/src/renderer/null.rs b/native/src/renderer/null.rs
index 4fb4f2d5..bd5bba23 100644
--- a/native/src/renderer/null.rs
+++ b/native/src/renderer/null.rs
@@ -170,6 +170,8 @@ impl radio::Renderer for Null {
 }
 
 impl checkbox::Renderer for Null {
+    type Style = ();
+
     fn default_size(&self) -> u32 {
         20
     }
@@ -180,6 +182,7 @@ impl checkbox::Renderer for Null {
         _is_checked: bool,
         _is_mouse_over: bool,
         _label: Self::Output,
+        _style: &Self::Style,
     ) {
     }
 }
diff --git a/native/src/widget/checkbox.rs b/native/src/widget/checkbox.rs
index 87a7f629..13a59410 100644
--- a/native/src/widget/checkbox.rs
+++ b/native/src/widget/checkbox.rs
@@ -3,7 +3,7 @@ use std::hash::Hash;
 
 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,
 };
@@ -13,7 +13,7 @@ use crate::{
 /// # Example
 ///
 /// ```
-/// # use iced_native::Checkbox;
+/// # type Checkbox<Message> = iced_native::Checkbox<Message, iced_native::renderer::Null>;
 /// #
 /// pub enum Message {
 ///     CheckboxToggled(bool),
@@ -26,15 +26,15 @@ 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> {
+pub struct Checkbox<Message, Renderer: self::Renderer> {
     is_checked: bool,
     on_toggle: Box<dyn Fn(bool) -> Message>,
     label: String,
-    label_color: Option<Color>,
     width: Length,
+    style: Renderer::Style,
 }
 
-impl<Message> Checkbox<Message> {
+impl<Message, Renderer: self::Renderer> Checkbox<Message, Renderer> {
     /// Creates a new [`Checkbox`].
     ///
     /// It expects:
@@ -53,29 +53,30 @@ impl<Message> Checkbox<Message> {
             is_checked,
             on_toggle: Box::new(f),
             label: String::from(label),
-            label_color: None,
             width: Length::Fill,
+            style: Renderer::Style::default(),
         }
     }
 
-    /// Sets the color of the label of the [`Checkbox`].
+    /// Sets the width of the [`Checkbox`].
     ///
     /// [`Checkbox`]: struct.Checkbox.html
-    pub fn label_color<C: Into<Color>>(mut self, color: C) -> Self {
-        self.label_color = Some(color.into());
+    pub fn width(mut self, width: Length) -> Self {
+        self.width = width;
         self
     }
 
-    /// Sets the width of the [`Checkbox`].
+    /// Sets the style of the [`Checkbox`].
     ///
     /// [`Checkbox`]: struct.Checkbox.html
-    pub fn width(mut self, width: Length) -> Self {
-        self.width = width;
+    pub fn style(mut self, style: impl Into<Renderer::Style>) -> Self {
+        self.style = style.into();
         self
     }
 }
 
-impl<Message, Renderer> Widget<Message, Renderer> for Checkbox<Message>
+impl<Message, Renderer> Widget<Message, Renderer>
+    for Checkbox<Message, Renderer>
 where
     Renderer: self::Renderer + text::Renderer + row::Renderer,
 {
@@ -152,7 +153,7 @@ where
             &self.label,
             text::Renderer::default_size(renderer),
             Font::Default,
-            self.label_color,
+            None,
             HorizontalAlignment::Left,
             VerticalAlignment::Center,
         );
@@ -165,6 +166,7 @@ where
             self.is_checked,
             is_mouse_over,
             label,
+            &self.style,
         )
     }
 
@@ -181,6 +183,8 @@ where
 /// [`Checkbox`]: struct.Checkbox.html
 /// [renderer]: ../../renderer/index.html
 pub trait Renderer: crate::Renderer {
+    type Style: Default;
+
     /// Returns the default size of a [`Checkbox`].
     ///
     /// [`Checkbox`]: struct.Checkbox.html
@@ -201,16 +205,19 @@ pub trait Renderer: crate::Renderer {
         is_checked: bool,
         is_mouse_over: bool,
         label: Self::Output,
+        style: &Self::Style,
     ) -> Self::Output;
 }
 
-impl<'a, Message, Renderer> From<Checkbox<Message>>
+impl<'a, Message, Renderer> From<Checkbox<Message, Renderer>>
     for Element<'a, Message, Renderer>
 where
-    Renderer: self::Renderer + text::Renderer + row::Renderer,
+    Renderer: 'static + self::Renderer + text::Renderer + row::Renderer,
     Message: 'static,
 {
-    fn from(checkbox: Checkbox<Message>) -> Element<'a, Message, Renderer> {
+    fn from(
+        checkbox: Checkbox<Message, Renderer>,
+    ) -> Element<'a, Message, Renderer> {
         Element::new(checkbox)
     }
 }
diff --git a/src/native.rs b/src/native.rs
index 2f2182ff..35441a3e 100644
--- a/src/native.rs
+++ b/src/native.rs
@@ -34,11 +34,11 @@ pub mod widget {
         pub use iced_winit::svg::{Handle, Svg};
     }
 
-    pub use iced_winit::{Checkbox, Text};
+    pub use iced_winit::Text;
 
     #[doc(no_inline)]
     pub use {
-        button::Button, container::Container, image::Image,
+        button::Button, checkbox::Checkbox, container::Container, image::Image,
         progress_bar::ProgressBar, radio::Radio, scrollable::Scrollable,
         slider::Slider, svg::Svg, text_input::TextInput,
     };
diff --git a/style/src/checkbox.rs b/style/src/checkbox.rs
new file mode 100644
index 00000000..e84dfd18
--- /dev/null
+++ b/style/src/checkbox.rs
@@ -0,0 +1,55 @@
+//! Show toggle controls using checkboxes.
+use iced_core::{Background, Color};
+
+/// The appearance of a checkbox.
+#[derive(Debug)]
+pub struct Style {
+    pub background: Background,
+    pub checkmark_color: Color,
+    pub border_radius: u16,
+    pub border_width: u16,
+    pub border_color: Color,
+}
+
+/// A set of rules that dictate the style of a checkbox.
+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)),
+            checkmark_color: Color::from_rgb(0.3, 0.3, 0.3),
+            border_radius: 5,
+            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/style/src/lib.rs b/style/src/lib.rs
index 991e0644..e0f56594 100644
--- a/style/src/lib.rs
+++ b/style/src/lib.rs
@@ -1,4 +1,5 @@
 pub mod button;
+pub mod checkbox;
 pub mod container;
 pub mod progress_bar;
 pub mod radio;
diff --git a/wgpu/src/renderer/widget/checkbox.rs b/wgpu/src/renderer/widget/checkbox.rs
index 1ed27ff7..cd90be5e 100644
--- a/wgpu/src/renderer/widget/checkbox.rs
+++ b/wgpu/src/renderer/widget/checkbox.rs
@@ -1,12 +1,13 @@
-use crate::{Primitive, Renderer};
+use crate::{checkbox::StyleSheet, Primitive, Renderer};
 use iced_native::{
-    checkbox, Background, Color, HorizontalAlignment, MouseCursor, Rectangle,
-    VerticalAlignment,
+    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 {
         SIZE as u32
     }
@@ -17,20 +18,20 @@ impl checkbox::Renderer for Renderer {
         is_checked: 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 checkbox = Primitive::Quad {
             bounds,
-            background: Background::Color(
-                if is_mouse_over {
-                    [0.90, 0.90, 0.90]
-                } else {
-                    [0.95, 0.95, 0.95]
-                }
-                .into(),
-            ),
-            border_radius: 5,
-            border_width: 1,
-            border_color: Color::from_rgb(0.6, 0.6, 0.6),
+            background: style.background,
+            border_radius: style.border_radius,
+            border_width: style.border_width,
+            border_color: style.border_color,
         };
 
         (
@@ -41,7 +42,7 @@ impl checkbox::Renderer for Renderer {
                         font: crate::text::BUILTIN_ICONS,
                         size: bounds.height * 0.7,
                         bounds: bounds,
-                        color: [0.3, 0.3, 0.3].into(),
+                        color: style.checkmark_color,
                         horizontal_alignment: HorizontalAlignment::Center,
                         vertical_alignment: VerticalAlignment::Center,
                     };
diff --git a/wgpu/src/widget.rs b/wgpu/src/widget.rs
index 991e0644..e0f56594 100644
--- a/wgpu/src/widget.rs
+++ b/wgpu/src/widget.rs
@@ -1,4 +1,5 @@
 pub mod button;
+pub mod checkbox;
 pub mod container;
 pub mod progress_bar;
 pub mod radio;
diff --git a/wgpu/src/widget/checkbox.rs b/wgpu/src/widget/checkbox.rs
new file mode 100644
index 00000000..da0d7a84
--- /dev/null
+++ b/wgpu/src/widget/checkbox.rs
@@ -0,0 +1,9 @@
+//! Show toggle controls using checkboxes.
+use crate::Renderer;
+
+pub use iced_style::checkbox::{Style, StyleSheet};
+
+/// A box that can be checked.
+///
+/// This is an alias of an `iced_native` checkbox with an `iced_wgpu::Renderer`.
+pub type Checkbox<Message> = iced_native::Checkbox<Message, Renderer>;