Add wheel events to event example; make interface prettier

packages/html/src/events.rs

@@ -828,7 +828,7 @@ pub mod on {
 
     pub type WheelEvent = UiEvent<WheelData>;
     #[cfg_attr(feature = "serialize", derive(serde::Serialize, serde::Deserialize))]
-    #[derive(Debug, Clone)]
+    #[derive(Clone)]
     pub struct WheelData {
         #[deprecated(since = "0.3.0", note = "use delta() instead")]
         pub delta_mode: u32,
@@ -889,6 +889,14 @@ pub mod on {
         }
     }
 
+    impl Debug for WheelData {
+        fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+            f.debug_struct("WheelData")
+                .field("delta", &self.delta())
+                .finish()
+        }
+    }
+
     pub type MediaEvent = UiEvent<MediaData>;
     #[cfg_attr(feature = "serialize", derive(serde::Serialize, serde::Deserialize))]
     #[derive(Debug, Clone)]