LibWeb: Separate "event listener" from "EventListener"

I can't imagine how this happened, but it seems we've managed to
conflate the "event listener" and "EventListener" concepts from the DOM
specification in some parts of the code.

We previously had two things:

    - DOM::EventListener
    - DOM::EventTarget::EventListenerRegistration

DOM::EventListener was roughly the "EventListener" IDL type,
and DOM::EventTarget::EventListenerRegistration was roughly the "event
listener" concept. However, they were used interchangeably (and
incorrectly!) in many places.

After this patch, we now have:

    - DOM::IDLEventListener
    - DOM::DOMEventListener

DOM::IDLEventListener is the "EventListener" IDL type,
and DOM::DOMEventListener is the "event listener" concept.

This patch also updates the addEventListener() and removeEventListener()
functions to follow the spec more closely, along with the "inner invoke"
function in our EventDispatcher.

1 files changed, 13 insertions, 12 deletions

diff --git a/Userland/Libraries/LibWeb/DOM/EventDispatcher.cpp b/Userland/Libraries/LibWeb/DOM/EventDispatcher.cpp
index 52f4331926..37e3c2d484 100644
--- a/Userland/Libraries/LibWeb/DOM/EventDispatcher.cpp
+++ b/Userland/Libraries/LibWeb/DOM/EventDispatcher.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
+ * Copyright (c) 2020-2022, Andreas Kling <kling@serenityos.org>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
@@ -14,11 +14,12 @@
 #include <LibWeb/Bindings/EventWrapperFactory.h>
 #include <LibWeb/Bindings/IDLAbstractOperations.h>
 #include <LibWeb/Bindings/WindowObject.h>
+#include <LibWeb/DOM/AbortSignal.h>
 #include <LibWeb/DOM/Document.h>
 #include <LibWeb/DOM/Event.h>
 #include <LibWeb/DOM/EventDispatcher.h>
-#include <LibWeb/DOM/EventListener.h>
 #include <LibWeb/DOM/EventTarget.h>
+#include <LibWeb/DOM/IDLEventListener.h>
 #include <LibWeb/DOM/Node.h>
 #include <LibWeb/DOM/ShadowRoot.h>
 #include <LibWeb/DOM/Window.h>
@@ -50,37 +51,37 @@ static EventTarget* retarget(EventTarget* left, EventTarget* right)
 }
 
 // https://dom.spec.whatwg.org/#concept-event-listener-inner-invoke
-bool EventDispatcher::inner_invoke(Event& event, Vector<EventTarget::EventListenerRegistration>& listeners, Event::Phase phase, bool invocation_target_in_shadow_tree)
+bool EventDispatcher::inner_invoke(Event& event, Vector<NonnullRefPtr<DOM::DOMEventListener>>& listeners, Event::Phase phase, bool invocation_target_in_shadow_tree)
 {
     // 1. Let found be false.
     bool found = false;
 
     // 2. For each listener in listeners, whose removed is false:
     for (auto& listener : listeners) {
-        if (listener.listener->removed())
+        if (listener->removed)
             continue;
 
         // 1. If event’s type attribute value is not listener’s type, then continue.
-        if (event.type() != listener.listener->type())
+        if (event.type() != listener->type)
             continue;
 
         // 2. Set found to true.
         found = true;
 
         // 3. If phase is "capturing" and listener’s capture is false, then continue.
-        if (phase == Event::Phase::CapturingPhase && !listener.listener->capture())
+        if (phase == Event::Phase::CapturingPhase && !listener->capture)
             continue;
 
         // 4. If phase is "bubbling" and listener’s capture is true, then continue.
-        if (phase == Event::Phase::BubblingPhase && listener.listener->capture())
+        if (phase == Event::Phase::BubblingPhase && listener->capture)
             continue;
 
         // 5. If listener’s once is true, then remove listener from event’s currentTarget attribute value’s event listener list.
-        if (listener.listener->once())
-            event.current_target()->remove_from_event_listener_list(listener.listener);
+        if (listener->once)
+            event.current_target()->remove_from_event_listener_list(listener);
 
         // 6. Let global be listener callback’s associated Realm’s global object.
-        auto& callback = listener.listener->callback();
+        auto& callback = listener->callback->callback();
         auto& global = callback.callback.cell()->global_object();
 
         // 7. Let currentEvent be undefined.
@@ -100,7 +101,7 @@ bool EventDispatcher::inner_invoke(Event& event, Vector<EventTarget::EventListen
         }
 
         // 9. If listener’s passive is true, then set event’s in passive listener flag.
-        if (listener.listener->passive())
+        if (listener->passive)
             event.set_in_passive_listener(true);
 
         // 10. Call a user object’s operation with listener’s callback, "handleEvent", « event », and event’s currentTarget attribute value. If this throws an exception, then:
@@ -155,7 +156,7 @@ void EventDispatcher::invoke(Event::PathEntry& struct_, Event& event, Event::Pha
     event.set_current_target(struct_.invocation_target);
 
     // NOTE: This is an intentional copy. Any event listeners added after this point will not be invoked.
-    auto listeners = event.current_target()->listeners();
+    auto listeners = event.current_target()->event_listener_list();
     bool invocation_target_in_shadow_tree = struct_.invocation_target_in_shadow_tree;
 
     bool found = inner_invoke(event, listeners, phase, invocation_target_in_shadow_tree);