LibWeb: Add XHREventTarget and have XHR inherit from it

Userland/Libraries/LibWeb/CMakeLists.txt

@@ -373,6 +373,7 @@ libweb_js_wrapper(UIEvents/MouseEvent)
 libweb_js_wrapper(UIEvents/UIEvent)
 libweb_js_wrapper(XHR/ProgressEvent)
 libweb_js_wrapper(XHR/XMLHttpRequest)
+libweb_js_wrapper(XHR/XMLHttpRequestEventTarget)
 
 get_property(WRAPPER_SOURCES GLOBAL PROPERTY wrapper_sources)
 set(SOURCES ${SOURCES} ${WRAPPER_SOURCES})

Userland/Libraries/LibWeb/Forward.h

@@ -192,6 +192,7 @@ class StackingContext;
 namespace Web::XHR {
 class ProgressEvent;
 class XMLHttpRequest;
+class XMLHttpRequestEventTarget;
 }
 
 namespace Web::Bindings {
@@ -300,6 +301,7 @@ class Wrapper;
 class XMLHttpRequestConstructor;
 class XMLHttpRequestPrototype;
 class XMLHttpRequestWrapper;
+class XMLHttpRequestEventTargetWrapper;
 class RangeConstructor;
 class RangePrototype;
 class RangeWrapper;

Userland/Libraries/LibWeb/XHR/XMLHttpRequest.cpp

@@ -43,7 +43,7 @@
 namespace Web::XHR {
 
 XMLHttpRequest::XMLHttpRequest(DOM::Window& window)
-    : EventTarget(static_cast<Bindings::ScriptExecutionContext&>(window.document()))
+    : XMLHttpRequestEventTarget(static_cast<Bindings::ScriptExecutionContext&>(window.document()))
     , m_window(window)
 {
 }

Userland/Libraries/LibWeb/XHR/XMLHttpRequest.h

@@ -32,14 +32,14 @@
 #include <AK/Weakable.h>
 #include <LibWeb/Bindings/Wrappable.h>
 #include <LibWeb/DOM/EventTarget.h>
+#include <LibWeb/XHR/XMLHttpRequestEventTarget.h>
 
 namespace Web::XHR {
 
 class XMLHttpRequest final
     : public RefCounted<XMLHttpRequest>
     , public Weakable<XMLHttpRequest>
-    , public DOM::EventTarget
-    , public Bindings::Wrappable {
+    , public XMLHttpRequestEventTarget {
 public:
     enum class ReadyState : u16 {
         Unsent = 0,

Userland/Libraries/LibWeb/XHR/XMLHttpRequest.idl

@@ -1,4 +1,4 @@
-interface XMLHttpRequest : EventTarget {
+interface XMLHttpRequest : XMLHttpRequestEventTarget {
 
     const unsigned short UNSENT = 0;
     const unsigned short OPENED = 1;

Userland/Libraries/LibWeb/XHR/XMLHttpRequestEventTarget.h

@@ -0,0 +1,56 @@
+/*
+ * Copyright (c) 2021, the SerenityOS developers.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <LibWeb/Bindings/EventTargetWrapperFactory.h>
+#include <LibWeb/DOM/EventDispatcher.h>
+#include <LibWeb/DOM/EventTarget.h>
+
+namespace Web::XHR {
+
+class XMLHttpRequestEventTarget
+    : public DOM::EventTarget
+    , public Bindings::Wrappable {
+public:
+    using WrapperType = Bindings::XMLHttpRequestEventTargetWrapper;
+
+    virtual ~XMLHttpRequestEventTarget() override {};
+
+protected:
+    explicit XMLHttpRequestEventTarget(Bindings::ScriptExecutionContext& script_execution_context)
+        : DOM::EventTarget(script_execution_context)
+    {
+    }
+
+private:
+    virtual JS::Object* create_wrapper(JS::GlobalObject& global_object) override
+    {
+        return wrap(global_object, *this);
+    }
+};
+
+}

Userland/Libraries/LibWeb/XHR/XMLHttpRequestEventTarget.idl

@@ -0,0 +1,3 @@
+interface XMLHttpRequestEventTarget : EventTarget {
+
+};