Reintroduce Box for style_sheet in Slider

examples/game_of_life/src/main.rs

@@ -853,7 +853,7 @@ impl Controls {
                     speed as f32,
                     Message::SpeedChanged,
                 )
-                .style(&style::Slider),
+                .style(style::Slider),
             )
             .push(Text::new(format!("x{}", speed)).size(16));
 

examples/styling/src/main.rs

@@ -90,7 +90,7 @@ impl Sandbox for Styling {
             self.slider_value,
             Message::SliderChanged,
         )
-        .style(self.theme.into());
+        .style(self.theme);
 
         let progress_bar =
             ProgressBar::new(0.0..=100.0, self.slider_value).style(self.theme);
@@ -221,11 +221,11 @@ mod style {
         }
     }
 
-    impl From<Theme> for &'static dyn slider::StyleSheet {
+    impl<'a> From<Theme> for Box<dyn slider::StyleSheet + 'a> {
         fn from(theme: Theme) -> Self {
             match theme {
                 Theme::Light => Default::default(),
-                Theme::Dark => &dark::Slider,
+                Theme::Dark => dark::Slider.into(),
             }
         }
     }

native/src/widget/slider.rs

@@ -50,7 +50,7 @@ pub struct Slider<'a, T, Message> {
     on_release: Option<Message>,
     width: Length,
     height: u16,
-    style_sheet: &'a dyn StyleSheet,
+    style_sheet: Box<dyn StyleSheet + 'a>,
 }
 
 impl<'a, T, Message> Slider<'a, T, Message>
@@ -127,8 +127,11 @@ where
     }
 
     /// Sets the style of the [`Slider`].
-    pub fn style(mut self, style_sheet: &'a dyn StyleSheet) -> Self {
-        self.style_sheet = style_sheet;
+    pub fn style(
+        mut self,
+        style_sheet: impl Into<Box<dyn StyleSheet + 'a>>,
+    ) -> Self {
+        self.style_sheet = style_sheet.into();
         self
     }
 

style/src/slider.rs

@@ -79,8 +79,17 @@ impl StyleSheet for Default {
     }
 }
 
-impl std::default::Default for &'static dyn StyleSheet {
+impl std::default::Default for Box<dyn StyleSheet> {
     fn default() -> Self {
-        &Default
+        Box::new(Default)
+    }
+}
+
+impl<'a, T> From<T> for Box<dyn StyleSheet + 'a>
+where
+    T: StyleSheet + 'a,
+{
+    fn from(style_sheet: T) -> Self {
+        Box::new(style_sheet)
     }
 }

web/src/widget/slider.rs

@@ -41,7 +41,7 @@ pub struct Slider<'a, T, Message> {
     #[allow(dead_code)]
     width: Length,
     #[allow(dead_code)]
-    style_sheet: &'a dyn StyleSheet,
+    style_sheet: Box<dyn StyleSheet + 'a>,
 }
 
 impl<'a, T, Message> Slider<'a, T, Message>
@@ -96,7 +96,10 @@ where
     }
 
     /// Sets the style of the [`Slider`].
-    pub fn style(mut self, style_sheet: &'a dyn StyleSheet) -> Self {
+    pub fn style(
+        mut self,
+        style_sheet: impl Into<Box<dyn StyleSheet + 'a>>,
+    ) -> Self {
         self.style_sheet = style_sheet.into();
         self
     }