feat: event handling on desktop

packages/core/src/events.rs

@@ -6,21 +6,30 @@ use std::{
     rc::Rc,
 };
 
-pub struct UiEvent<T: 'static> {
-    pub(crate) bubble_state: Cell<bool>,
+pub struct UiEvent<T: 'static + ?Sized> {
+    pub(crate) bubbles: Rc<Cell<bool>>,
     pub(crate) data: Rc<T>,
 }
-impl<T> Clone for UiEvent<T> {
+
+impl UiEvent<dyn Any> {
+    pub fn downcast<T: 'static + Sized>(self) -> Option<UiEvent<T>> {
+        Some(UiEvent {
+            bubbles: self.bubbles,
+            data: self.data.downcast().ok()?,
+        })
+    }
+}
+impl<T: ?Sized> Clone for UiEvent<T> {
     fn clone(&self) -> Self {
         Self {
-            bubble_state: self.bubble_state.clone(),
+            bubbles: self.bubbles.clone(),
             data: self.data.clone(),
         }
     }
 }
 impl<T> UiEvent<T> {
     pub fn cancel_bubble(&self) {
-        self.bubble_state.set(false);
+        self.bubbles.set(false);
     }
 }
 
@@ -35,7 +44,7 @@ impl<T> std::ops::Deref for UiEvent<T> {
 impl<T: Debug> std::fmt::Debug for UiEvent<T> {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         f.debug_struct("UiEvent")
-            .field("bubble_state", &self.bubble_state)
+            .field("bubble_state", &self.bubbles)
             .field("data", &self.data)
             .finish()
     }
@@ -93,18 +102,6 @@ pub enum EventPriority {
     Low = 0,
 }
 
-// ensures a strict descendant relationship
-// returns false if the paths are equal
-pub fn is_path_ascendant(small: &[u8], big: &[u8]) -> bool {
-    if small.len() >= big.len() {
-        return false;
-    }
-
-    small == &big[..small.len()]
-}
-
-pub type InternalHandler<'bump> = &'bump RefCell<Option<InternalListenerCallback<'bump>>>;
-type InternalListenerCallback<'bump> = BumpBox<'bump, dyn FnMut(&'bump dyn Any) + 'bump>;
 type ExternalListenerCallback<'bump, T> = BumpBox<'bump, dyn FnMut(T) + 'bump>;
 
 /// The callback type generated by the `rsx!` macro when an `on` field is specified for components.