dom: Implement minimal IntersectionObserver workflow (#35551)

* Add very rough implemnentation of observation steps Signed-off-by: stevennovaryo <steven.novaryo@gmail.com> * Fix entry reflection and propagate can_gc Signed-off-by: stevennovaryo <steven.novaryo@gmail.com> * Fix BorrowError and add fragment find descendant Signed-off-by: stevennovaryo <steven.novaryo@gmail.com> * Implement is descendant in containing block path correctly Signed-off-by: stevennovaryo <steven.novaryo@gmail.com> * Fix unrooted error and tidy issues Signed-off-by: stevennovaryo <steven.novaryo@gmail.com> * Fix comments Signed-off-by: stevennovaryo <steven.novaryo@gmail.com> * Remove is descendant of other node query I suppose these changes is better separated to other PRs. Signed-off-by: stevennovaryo <steven.novaryo@gmail.com> * Fix intersection and refactor registration Signed-off-by: stevennovaryo <steven.novaryo@gmail.com> * Use AppUnit more and propagate GlobalScope better Signed-off-by: stevennovaryo <steven.novaryo@gmail.com> * Update WPT expectations Signed-off-by: stevennovaryo <steven.novaryo@gmail.com> * Revert delay changes Signed-off-by: stevennovaryo <steven.novaryo@gmail.com> * Align compute intersection algo to other browser actual behavior Signed-off-by: stevennovaryo <steven.novaryo@gmail.com> * Align processing documents and note several issues Signed-off-by: stevennovaryo <steven.novaryo@gmail.com> * Update WPT Signed-off-by: stevennovaryo <steven.novaryo@gmail.com> * Minor lint Signed-off-by: stevennovaryo <steven.novaryo@gmail.com> * Fix top level browsing context Signed-off-by: stevennovaryo <steven.novaryo@gmail.com> * Make Registration rootable Signed-off-by: stevennovaryo <steven.novaryo@gmail.com> * Avoid reflow inside observation step algo Signed-off-by: stevennovaryo <steven.novaryo@gmail.com> * Using borrow for iterating registration Signed-off-by: stevennovaryo <steven.novaryo@gmail.com> * Fix document disconnect Signed-off-by: stevennovaryo <steven.novaryo@gmail.com> * Update WPT Signed-off-by: stevennovaryo <steven.novaryo@gmail.com> * Address comments and minor quality suggestions Signed-off-by: stevennovaryo <steven.novaryo@gmail.com> * Root the observer before nofifying any of it Signed-off-by: stevennovaryo <steven.novaryo@gmail.com> * Tidy docs Signed-off-by: stevennovaryo <steven.novaryo@gmail.com> * Account not found element and refactor observation step Signed-off-by: stevennovaryo <steven.novaryo@gmail.com> * Fix documentations Signed-off-by: stevennovaryo <steven.novaryo@gmail.com> * Ignore position of document viewport Signed-off-by: stevennovaryo <steven.novaryo@gmail.com> * Refactor root intersection rectangle Signed-off-by: stevennovaryo <steven.novaryo@gmail.com> * Add can GC note to the callback Signed-off-by: stevennovaryo <steven.novaryo@gmail.com> * Fix top-level browsing context term Signed-off-by: stevennovaryo <steven.novaryo@gmail.com> * Fix minor comments Signed-off-by: stevennovaryo <steven.novaryo@gmail.com> --------- Signed-off-by: stevennovaryo <steven.novaryo@gmail.com>
2025-06-06 16:45:39 +00:00 · 2025-03-18 19:09:44 +08:00 · 2025-03-18 19:09:44 +08:00 · 67a5f285ed
commit 67a5f285ed
parent 2113e54819
48 changed files with 850 additions and 175 deletions
--- a/components/script/dom/element.rs
+++ b/components/script/dom/element.rs
@ -653,15 +653,28 @@ impl Element {
        }))
    }

-    /// Add a new IntersectionObserverRegistration to the element.
-    #[cfg_attr(crown, allow(crown::unrooted_must_root))]
-    pub(crate) fn add_intersection_observer_registration(
+    pub(crate) fn get_intersection_observer_registration(
        &self,
-        registration: IntersectionObserverRegistration,
+        observer: &IntersectionObserver,
+    ) -> Option<Ref<IntersectionObserverRegistration>> {
+        if let Some(registrations) = self.registered_intersection_observers() {
+            registrations
+                .iter()
+                .position(|reg_obs| reg_obs.observer == observer)
+                .map(|index| Ref::map(registrations, |registrations| &registrations[index]))
+        } else {
+            None
+        }
+    }
+
+    /// Add a new IntersectionObserverRegistration with initial value to the element.
+    pub(crate) fn add_initial_intersection_observer_registration(
+        &self,
+        observer: &IntersectionObserver,
    ) {
        self.ensure_rare_data()
            .registered_intersection_observers
-            .push(registration);
+            .push(IntersectionObserverRegistration::new_initial(observer));
    }

    /// Removes a certain IntersectionObserver.