Simplify theming for Svg widget

widget/src/helpers.rs

@@ -371,7 +371,7 @@ pub fn image<Handle>(handle: impl Into<Handle>) -> crate::Image<Handle> {
 #[cfg(feature = "svg")]
 pub fn svg<Theme>(handle: impl Into<core::svg::Handle>) -> crate::Svg<Theme>
 where
-    Theme: crate::svg::StyleSheet,
+    Theme: crate::svg::Style,
 {
     crate::Svg::new(handle)
 }

widget/src/svg.rs

@@ -5,13 +5,13 @@ use crate::core::renderer;
 use crate::core::svg;
 use crate::core::widget::Tree;
 use crate::core::{
-    ContentFit, Element, Layout, Length, Rectangle, Size, Vector, Widget,
+    Color, ContentFit, Element, Layout, Length, Rectangle, Size, Vector, Widget,
 };
+use crate::style::Theme;
 
 use std::path::PathBuf;
 
-pub use crate::style::svg::{Appearance, StyleSheet};
-pub use svg::Handle;
+pub use crate::core::svg::Handle;
 
 /// A vector graphics image.
 ///
@@ -20,36 +20,36 @@ pub use svg::Handle;
 /// [`Svg`] images can have a considerable rendering cost when resized,
 /// specially when they are complex.
 #[allow(missing_debug_implementations)]
-pub struct Svg<Theme = crate::Theme>
-where
-    Theme: StyleSheet,
-{
+pub struct Svg<Theme = crate::Theme> {
     handle: Handle,
     width: Length,
     height: Length,
     content_fit: ContentFit,
-    style: <Theme as StyleSheet>::Style,
+    style: fn(&Theme, Status) -> Appearance,
 }
 
-impl<Theme> Svg<Theme>
-where
-    Theme: StyleSheet,
-{
+impl<Theme> Svg<Theme> {
     /// Creates a new [`Svg`] from the given [`Handle`].
-    pub fn new(handle: impl Into<Handle>) -> Self {
+    pub fn new(handle: impl Into<Handle>) -> Self
+    where
+        Theme: Style,
+    {
         Svg {
             handle: handle.into(),
             width: Length::Fill,
             height: Length::Shrink,
             content_fit: ContentFit::Contain,
-            style: Default::default(),
+            style: Theme::style(),
         }
     }
 
     /// Creates a new [`Svg`] that will display the contents of the file at the
     /// provided path.
     #[must_use]
-    pub fn from_path(path: impl Into<PathBuf>) -> Self {
+    pub fn from_path(path: impl Into<PathBuf>) -> Self
+    where
+        Theme: Style,
+    {
         Self::new(Handle::from_path(path))
     }
 
@@ -80,7 +80,7 @@ where
 
     /// Sets the style variant of this [`Svg`].
     #[must_use]
-    pub fn style(mut self, style: impl Into<Theme::Style>) -> Self {
+    pub fn style(mut self, style: fn(&Theme, Status) -> Appearance) -> Self {
         self.style = style.into();
         self
     }
@@ -88,7 +88,6 @@ where
 
 impl<Message, Theme, Renderer> Widget<Message, Theme, Renderer> for Svg<Theme>
 where
-    Theme: iced_style::svg::StyleSheet,
     Renderer: svg::Renderer,
 {
     fn size(&self) -> Size<Length> {
@@ -158,12 +157,14 @@ where
                 ..bounds
             };
 
-            let appearance = if is_mouse_over {
-                theme.hovered(&self.style)
+            let status = if is_mouse_over {
+                Status::Hovered
             } else {
-                theme.appearance(&self.style)
+                Status::Idle
             };
 
+            let appearance = (self.style)(theme, status);
+
             renderer.draw(
                 self.handle.clone(),
                 appearance.color,
@@ -184,10 +185,42 @@ where
 impl<'a, Message, Theme, Renderer> From<Svg<Theme>>
     for Element<'a, Message, Theme, Renderer>
 where
-    Theme: iced_style::svg::StyleSheet + 'a,
+    Theme: 'a,
     Renderer: svg::Renderer + 'a,
 {
     fn from(icon: Svg<Theme>) -> Element<'a, Message, Theme, Renderer> {
         Element::new(icon)
     }
 }
+
+/// The possible status of an [`Svg`].
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum Status {
+    /// The [`Svg`] is idle.
+    Idle,
+    /// The [`Svg`] is being hovered.
+    Hovered,
+}
+
+/// The appearance of an [`Svg`].
+#[derive(Debug, Clone, Copy, PartialEq, Default)]
+pub struct Appearance {
+    /// The [`Color`] filter of an [`Svg`].
+    ///
+    /// Useful for coloring a symbolic icon.
+    ///
+    /// `None` keeps the original color.
+    pub color: Option<Color>,
+}
+
+/// The definiton of the default style of an [`Svg`].
+pub trait Style {
+    /// Returns the default style of an [`Svg`].
+    fn style() -> fn(&Self, Status) -> Appearance;
+}
+
+impl Style for Theme {
+    fn style() -> fn(&Self, Status) -> Appearance {
+        |_, _| Appearance::default()
+    }
+}