Use closures for TextInput::style

widget/src/combo_box.rs

@@ -62,7 +62,7 @@ where
         on_selected: impl Fn(T) -> Message + 'static,
     ) -> Self
     where
-        Theme: DefaultStyle,
+        Theme: DefaultStyle + 'a,
     {
         let style = Theme::default_style();
 
@@ -125,7 +125,10 @@ where
     }
 
     /// Sets the style of the [`ComboBox`].
-    pub fn style(mut self, style: impl Into<Style<Theme>>) -> Self {
+    pub fn style(mut self, style: impl Into<Style<Theme>>) -> Self
+    where
+        Theme: 'a,
+    {
         let style = style.into();
 
         self.text_input = self.text_input.style(style.text_input);
@@ -761,10 +764,10 @@ where
 }
 
 /// The style of a [`ComboBox`].
-#[derive(Debug, PartialEq, Eq)]
+#[allow(missing_debug_implementations)]
 pub struct Style<Theme> {
     /// The style of the [`TextInput`] of the [`ComboBox`].
-    pub text_input: fn(&Theme, text_input::Status) -> text_input::Appearance,
+    pub text_input: text_input::Style<'static, Theme>,
 
     /// The style of the [`Menu`] of the [`ComboBox`].
     ///
@@ -772,22 +775,6 @@ pub struct Style<Theme> {
     pub menu: menu::Style<Theme>,
 }
 
-impl Style<Theme> {
-    /// The default style of a [`ComboBox`].
-    pub const DEFAULT: Self = Self {
-        text_input: text_input::default,
-        menu: menu::Style::<Theme>::DEFAULT,
-    };
-}
-
-impl<Theme> Clone for Style<Theme> {
-    fn clone(&self) -> Self {
-        *self
-    }
-}
-
-impl<Theme> Copy for Style<Theme> {}
-
 /// The default style of a [`ComboBox`].
 pub trait DefaultStyle: Sized {
     /// Returns the default style of a [`ComboBox`].
@@ -796,6 +783,9 @@ pub trait DefaultStyle: Sized {
 
 impl DefaultStyle for Theme {
     fn default_style() -> Style<Self> {
-        Style::<Self>::DEFAULT
+        Style {
+            text_input: Box::new(text_input::default),
+            menu: menu::Style::DEFAULT,
+        }
     }
 }

widget/src/helpers.rs

@@ -209,7 +209,7 @@ pub fn text_input<'a, Message, Theme, Renderer>(
 ) -> TextInput<'a, Message, Theme, Renderer>
 where
     Message: Clone,
-    Theme: text_input::DefaultStyle,
+    Theme: text_input::DefaultStyle + 'a,
     Renderer: core::text::Renderer,
 {
     TextInput::new(placeholder, value)
@@ -291,7 +291,7 @@ pub fn combo_box<'a, T, Message, Theme, Renderer>(
 ) -> ComboBox<'a, T, Message, Theme, Renderer>
 where
     T: std::fmt::Display + Clone,
-    Theme: combo_box::DefaultStyle,
+    Theme: combo_box::DefaultStyle + 'a,
     Renderer: core::text::Renderer,
 {
     ComboBox::new(state, placeholder, selection, on_selected)

widget/src/text_input.rs

@@ -75,7 +75,7 @@ pub struct TextInput<
     on_paste: Option<Box<dyn Fn(String) -> Message + 'a>>,
     on_submit: Option<Message>,
     icon: Option<Icon<Renderer::Font>>,
-    style: Style<Theme>,
+    style: Style<'a, Theme>,
 }
 
 /// The default [`Padding`] of a [`TextInput`].
@@ -90,9 +90,9 @@ where
     /// its current value.
     pub fn new(placeholder: &str, value: &str) -> Self
     where
-        Theme: DefaultStyle,
+        Theme: DefaultStyle + 'a,
     {
-        Self::with_style(placeholder, value, Theme::default_style())
+        Self::with_style(placeholder, value, Theme::default_style)
     }
 
     /// Creates a new [`TextInput`] with the given placeholder,
@@ -100,7 +100,7 @@ where
     pub fn with_style(
         placeholder: &str,
         value: &str,
-        style: fn(&Theme, Status) -> Appearance,
+        style: impl Fn(&Theme, Status) -> Appearance + 'a,
     ) -> Self {
         TextInput {
             id: None,
@@ -116,7 +116,7 @@ where
             on_paste: None,
             on_submit: None,
             icon: None,
-            style: style.into(),
+            style: Box::new(style),
         }
     }
 
@@ -203,8 +203,11 @@ where
     }
 
     /// Sets the style of the [`TextInput`].
-    pub fn style(mut self, style: fn(&Theme, Status) -> Appearance) -> Self {
-        self.style = style.into();
+    pub fn style(
+        mut self,
+        style: impl Fn(&Theme, Status) -> Appearance + 'a,
+    ) -> Self {
+        self.style = Box::new(style);
         self
     }
 
@@ -1413,23 +1416,23 @@ pub struct Appearance {
 }
 
 /// The style of a [`TextInput`].
-pub type Style<Theme> = fn(&Theme, Status) -> Appearance;
+pub type Style<'a, Theme> = Box<dyn Fn(&Theme, Status) -> Appearance + 'a>;
 
 /// The default style of a [`TextInput`].
 pub trait DefaultStyle {
     /// Returns the default style of a [`TextInput`].
-    fn default_style() -> Style<Self>;
+    fn default_style(&self, status: Status) -> Appearance;
 }
 
 impl DefaultStyle for Theme {
-    fn default_style() -> Style<Self> {
-        default
+    fn default_style(&self, status: Status) -> Appearance {
+        default(self, status)
     }
 }
 
 impl DefaultStyle for Appearance {
-    fn default_style() -> Style<Self> {
-        |appearance, _status| *appearance
+    fn default_style(&self, _status: Status) -> Appearance {
+        *self
     }
 }