Added the ability to detect scrolling to the MouseArea

core/src/theme.rs

@@ -89,6 +89,11 @@ impl Theme {
         Self::custom_with_fn(name, palette, palette::Extended::generate)
     }
 
+    /// Creates a new custom [`Theme`] from the given [`Palette`] and a custom [`palette::Extended`] palette
+    pub fn custom_with_extended(name: String, palette: Palette, extended: palette::Extended) -> Self {
+        Self::Custom(Arc::new(Custom::new_with_extended(name, palette, extended)))
+    }
+
     /// Creates a new custom [`Theme`] from the given [`Palette`], with
     /// a custom generator of a [`palette::Extended`].
     pub fn custom_with_fn(
@@ -226,6 +231,15 @@ impl Custom {
         Self::with_fn(name, palette, palette::Extended::generate)
     }
 
+    /// Creates a [`Custom`] theme from the given [`Palette`] and a custom [`palette::Extended`] palette
+    pub fn new_with_extended(name: String, palette: Palette, extended: palette::Extended) -> Self {
+        Self {
+            name,
+            palette,
+            extended,
+        }
+    }
+
     /// Creates a [`Custom`] theme from the given [`Palette`] with
     /// a custom generator of a [`palette::Extended`].
     pub fn with_fn(

widget/src/mouse_area.rs

@@ -1,6 +1,7 @@
 //! A container for capturing mouse events.
 
 use iced_renderer::core::Point;
+use iced_runtime::core::mouse::ScrollDelta;
 
 use crate::core::event::{self, Event};
 use crate::core::layout;
@@ -28,6 +29,7 @@ pub struct MouseArea<
     on_right_release: Option<Message>,
     on_middle_press: Option<Message>,
     on_middle_release: Option<Message>,
+    on_scroll: Option<Box<dyn Fn(ScrollDelta) -> Message + 'a>>,
     on_enter: Option<Message>,
     on_move: Option<Box<dyn Fn(Point) -> Message>>,
     on_exit: Option<Message>,
@@ -77,6 +79,16 @@ impl<'a, Message, Theme, Renderer> MouseArea<'a, Message, Theme, Renderer> {
         self
     }
 
+    /// The message to emit when scroll wheel is used
+    #[must_use]
+    pub fn on_scroll<F>(mut self, build_message: F) -> Self
+    where
+        F: Fn(ScrollDelta) -> Message + 'static,
+    {
+        self.on_scroll = Some(Box::new(build_message));
+        self
+    }
+
     /// The message to emit when the mouse enters the area.
     #[must_use]
     pub fn on_enter(mut self, message: Message) -> Self {
@@ -128,6 +140,7 @@ impl<'a, Message, Theme, Renderer> MouseArea<'a, Message, Theme, Renderer> {
             on_right_release: None,
             on_middle_press: None,
             on_middle_release: None,
+            on_scroll: None,
             on_enter: None,
             on_move: None,
             on_exit: None,
@@ -397,5 +410,13 @@ fn update<Message: Clone, Theme, Renderer>(
         }
     }
 
+    if let Some(message) = widget.on_scroll.as_ref() {
+        if let Event::Mouse(mouse::Event::WheelScrolled { delta }) = event {
+            shell.publish(message(delta));
+
+            return event::Status::Captured;
+        }
+    }
+
     event::Status::Ignored
 }