Move styling to a brand new iced_style crate

wgpu/src/widget/button.rs

@@ -5,86 +5,11 @@
 //! [`Button`]: type.Button.html
 //! [`State`]: struct.State.html
 use crate::Renderer;
-use iced_native::{Background, Color};
 
 pub use iced_native::button::State;
+pub use iced_style::button::{Style, StyleSheet};
 
 /// A widget that produces a message when clicked.
 ///
 /// This is an alias of an `iced_native` button with an `iced_wgpu::Renderer`.
 pub type Button<'a, Message> = iced_native::Button<'a, Message, Renderer>;
-
-#[derive(Debug)]
-pub struct Style {
-    pub shadow_offset: f32,
-    pub background: Option<Background>,
-    pub border_radius: u16,
-    pub text_color: Color,
-}
-
-pub trait StyleSheet {
-    fn active(&self) -> Style;
-
-    fn hovered(&self) -> Style {
-        let active = self.active();
-
-        Style {
-            shadow_offset: active.shadow_offset + 1.0,
-            ..active
-        }
-    }
-
-    fn pressed(&self) -> Style {
-        Style {
-            shadow_offset: 0.0,
-            ..self.active()
-        }
-    }
-
-    fn disabled(&self) -> Style {
-        let active = self.active();
-
-        Style {
-            shadow_offset: 0.0,
-            background: active.background.map(|background| match background {
-                Background::Color(color) => Background::Color(Color {
-                    a: color.a * 0.5,
-                    ..color
-                }),
-            }),
-            text_color: Color {
-                a: active.text_color.a * 0.5,
-                ..active.text_color
-            },
-            ..active
-        }
-    }
-}
-
-struct Default;
-
-impl StyleSheet for Default {
-    fn active(&self) -> Style {
-        Style {
-            shadow_offset: 1.0,
-            background: Some(Background::Color([0.5, 0.5, 0.5].into())),
-            border_radius: 5,
-            text_color: Color::BLACK,
-        }
-    }
-}
-
-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)
-    }
-}