Implement theme styling for PickList and Menu

style/src/pick_list.rs

@@ -1,9 +1,12 @@
-use crate::menu;
 use iced_core::{Background, Color};
 
+use crate::container;
+use crate::menu;
+use crate::scrollable;
+
 /// The appearance of a pick list.
 #[derive(Debug, Clone, Copy)]
-pub struct Style {
+pub struct Appearance {
     pub text_color: Color,
     pub placeholder_color: Color,
     pub background: Background,
@@ -13,60 +16,14 @@ pub struct Style {
     pub icon_size: f32,
 }
 
-impl std::default::Default for Style {
-    fn default() -> Self {
-        Self {
-            text_color: Color::BLACK,
-            placeholder_color: [0.4, 0.4, 0.4].into(),
-            background: Background::Color([0.87, 0.87, 0.87].into()),
-            border_radius: 0.0,
-            border_width: 1.0,
-            border_color: [0.7, 0.7, 0.7].into(),
-            icon_size: 0.7,
-        }
-    }
-}
-
 /// A set of rules that dictate the style of a container.
-pub trait StyleSheet {
-    fn menu(&self) -> menu::Style;
+pub trait StyleSheet:
+    container::StyleSheet + menu::StyleSheet + scrollable::StyleSheet
+{
+    type Style: Default + Copy + Into<<Self as menu::StyleSheet>::Style>;
 
-    fn active(&self) -> Style;
+    fn active(&self, style: <Self as StyleSheet>::Style) -> Appearance;
 
     /// Produces the style of a container.
-    fn hovered(&self) -> Style;
-}
-
-struct Default;
-
-impl StyleSheet for Default {
-    fn menu(&self) -> menu::Style {
-        menu::Style::default()
-    }
-
-    fn active(&self) -> Style {
-        Style::default()
-    }
-
-    fn hovered(&self) -> Style {
-        Style {
-            border_color: Color::BLACK,
-            ..self.active()
-        }
-    }
-}
-
-impl<'a> std::default::Default for Box<dyn StyleSheet + 'a> {
-    fn default() -> Self {
-        Box::new(Default)
-    }
-}
-
-impl<'a, T> From<T> for Box<dyn StyleSheet + 'a>
-where
-    T: 'a + StyleSheet,
-{
-    fn from(style: T) -> Self {
-        Box::new(style)
-    }
+    fn hovered(&self, style: <Self as StyleSheet>::Style) -> Appearance;
 }