LibWeb: Implement the ClipboardEvent IDL interface

We don't actually generate any such events ourselves. But Google Lens
will create one with the DataTransfer attribute set to that of any drop
event we send it.

Meta/Lagom/Tools/CodeGenerators/LibWeb/BindingsGenerator/IDLGenerators.cpp

@@ -4178,6 +4178,7 @@ static void generate_using_namespace_definitions(SourceGenerator& generator)
     generator.append(R"~~~(
     // FIXME: This is a total hack until we can figure out the namespace for a given type somehow.
     using namespace Web::Animations;
+    using namespace Web::Clipboard;
     using namespace Web::Crypto;
     using namespace Web::CSS;
     using namespace Web::DOM;

Tests/LibWeb/Text/expected/all-window-properties.txt

@@ -51,6 +51,7 @@ CanvasPattern
 CanvasRenderingContext2D
 CharacterData
 Clipboard
+ClipboardEvent
 CloseEvent
 CloseWatcher
 Comment

Userland/Libraries/LibWeb/CMakeLists.txt

@@ -24,6 +24,7 @@ set(SOURCES
     Bindings/OptionConstructor.cpp
     Bindings/PlatformObject.cpp
     Clipboard/Clipboard.cpp
+    Clipboard/ClipboardEvent.cpp
     Crypto/Crypto.cpp
     Crypto/CryptoAlgorithms.cpp
     Crypto/CryptoBindings.cpp

Userland/Libraries/LibWeb/Clipboard/ClipboardEvent.cpp

@@ -0,0 +1,41 @@
+/*
+ * Copyright (c) 2024, Tim Flynn <trflynn89@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibJS/Runtime/Realm.h>
+#include <LibWeb/Bindings/ClipboardEventPrototype.h>
+#include <LibWeb/Bindings/Intrinsics.h>
+#include <LibWeb/Clipboard/ClipboardEvent.h>
+
+namespace Web::Clipboard {
+
+JS_DEFINE_ALLOCATOR(ClipboardEvent);
+
+JS::NonnullGCPtr<ClipboardEvent> ClipboardEvent::construct_impl(JS::Realm& realm, FlyString const& event_name, ClipboardEventInit const& event_init)
+{
+    return realm.heap().allocate<ClipboardEvent>(realm, realm, event_name, event_init);
+}
+
+ClipboardEvent::ClipboardEvent(JS::Realm& realm, FlyString const& event_name, ClipboardEventInit const& event_init)
+    : DOM::Event(realm, event_name, event_init)
+    , m_clipboard_data(event_init.clipboard_data)
+{
+}
+
+ClipboardEvent::~ClipboardEvent() = default;
+
+void ClipboardEvent::initialize(JS::Realm& realm)
+{
+    Base::initialize(realm);
+    WEB_SET_PROTOTYPE_FOR_INTERFACE(ClipboardEvent);
+}
+
+void ClipboardEvent::visit_edges(JS::Cell::Visitor& visitor)
+{
+    Base::visit_edges(visitor);
+    visitor.visit(m_clipboard_data);
+}
+
+}

Userland/Libraries/LibWeb/Clipboard/ClipboardEvent.h

@@ -0,0 +1,41 @@
+/*
+ * Copyright (c) 2024, Tim Flynn <trflynn89@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <LibJS/Heap/GCPtr.h>
+#include <LibWeb/DOM/Event.h>
+#include <LibWeb/Forward.h>
+#include <LibWeb/HTML/DataTransfer.h>
+
+namespace Web::Clipboard {
+
+struct ClipboardEventInit : public DOM::EventInit {
+    JS::GCPtr<HTML::DataTransfer> clipboard_data;
+};
+
+// https://w3c.github.io/clipboard-apis/#clipboardevent
+class ClipboardEvent : public DOM::Event {
+    WEB_PLATFORM_OBJECT(ClipboardEvent, DOM::Event);
+    JS_DECLARE_ALLOCATOR(ClipboardEvent);
+
+public:
+    static JS::NonnullGCPtr<ClipboardEvent> construct_impl(JS::Realm&, FlyString const& event_name, ClipboardEventInit const& event_init);
+
+    virtual ~ClipboardEvent() override;
+
+    JS::GCPtr<HTML::DataTransfer> clipboard_data() { return m_clipboard_data; }
+
+private:
+    ClipboardEvent(JS::Realm&, FlyString const& event_name, ClipboardEventInit const& event_init);
+
+    virtual void initialize(JS::Realm&) override;
+    virtual void visit_edges(JS::Cell::Visitor&) override;
+
+    JS::GCPtr<HTML::DataTransfer> m_clipboard_data;
+};
+
+}

Userland/Libraries/LibWeb/Clipboard/ClipboardEvent.idl

@@ -0,0 +1,13 @@
+#import <DOM/Event.idl>
+#import <HTML/DataTransfer.idl>
+
+dictionary ClipboardEventInit : EventInit {
+    DataTransfer? clipboardData = null;
+};
+
+// https://w3c.github.io/clipboard-apis/#clipboardevent
+[Exposed=Window]
+interface ClipboardEvent : Event {
+    constructor(DOMString type, optional ClipboardEventInit eventInitDict = {});
+    readonly attribute DataTransfer? clipboardData;
+};

Userland/Libraries/LibWeb/idl_files.cmake

@@ -8,6 +8,7 @@ libweb_js_bindings(Animations/AnimationTimeline)
 libweb_js_bindings(Animations/DocumentTimeline)
 libweb_js_bindings(Animations/KeyframeEffect)
 libweb_js_bindings(Clipboard/Clipboard)
+libweb_js_bindings(Clipboard/ClipboardEvent)
 libweb_js_bindings(Crypto/Crypto)
 libweb_js_bindings(Crypto/CryptoKey)
 libweb_js_bindings(Crypto/SubtleCrypto)