From 460e1bd072c81e90f86a05af212d6950fbe87d4e Mon Sep 17 00:00:00 2001
From: Timothy Flynn <trflynn89@pm.me>
Date: Tue, 4 Apr 2023 09:28:59 -0400
Subject: [PATCH] LibWeb: Implement TrackEvent for media events

---
 Userland/Libraries/LibWeb/CMakeLists.txt      |  1 +
 Userland/Libraries/LibWeb/Forward.h           |  1 +
 Userland/Libraries/LibWeb/HTML/TrackEvent.cpp | 37 +++++++++++++++++++
 Userland/Libraries/LibWeb/HTML/TrackEvent.h   | 36 ++++++++++++++++++
 Userland/Libraries/LibWeb/HTML/TrackEvent.idl | 16 ++++++++
 Userland/Libraries/LibWeb/idl_files.cmake     |  1 +
 6 files changed, 92 insertions(+)
 create mode 100644 Userland/Libraries/LibWeb/HTML/TrackEvent.cpp
 create mode 100644 Userland/Libraries/LibWeb/HTML/TrackEvent.h
 create mode 100644 Userland/Libraries/LibWeb/HTML/TrackEvent.idl

diff --git a/Userland/Libraries/LibWeb/CMakeLists.txt b/Userland/Libraries/LibWeb/CMakeLists.txt
index eb04197fe8..38dce49897 100644
--- a/Userland/Libraries/LibWeb/CMakeLists.txt
+++ b/Userland/Libraries/LibWeb/CMakeLists.txt
@@ -343,6 +343,7 @@ set(SOURCES
     HTML/TagNames.cpp
     HTML/TextMetrics.cpp
     HTML/Timer.cpp
+    HTML/TrackEvent.cpp
     HTML/VideoTrack.cpp
     HTML/VideoTrackList.cpp
     HTML/Window.cpp
diff --git a/Userland/Libraries/LibWeb/Forward.h b/Userland/Libraries/LibWeb/Forward.h
index 2d17e90bea..b8922f348c 100644
--- a/Userland/Libraries/LibWeb/Forward.h
+++ b/Userland/Libraries/LibWeb/Forward.h
@@ -355,6 +355,7 @@ class Storage;
 class SubmitEvent;
 class TextMetrics;
 class Timer;
+class TrackEvent;
 class VideoTrack;
 class VideoTrackList;
 class Window;
diff --git a/Userland/Libraries/LibWeb/HTML/TrackEvent.cpp b/Userland/Libraries/LibWeb/HTML/TrackEvent.cpp
new file mode 100644
index 0000000000..cc8b56c109
--- /dev/null
+++ b/Userland/Libraries/LibWeb/HTML/TrackEvent.cpp
@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2023, Tim Flynn <trflynn89@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibWeb/Bindings/Intrinsics.h>
+#include <LibWeb/Bindings/TrackEventPrototype.h>
+#include <LibWeb/HTML/TrackEvent.h>
+
+namespace Web::HTML {
+
+WebIDL::ExceptionOr<JS::NonnullGCPtr<TrackEvent>> TrackEvent::create(JS::Realm& realm, FlyString const& event_name, TrackEventInit const& event_init)
+{
+    return MUST_OR_THROW_OOM(realm.heap().allocate<TrackEvent>(realm, realm, event_name, event_init));
+}
+
+WebIDL::ExceptionOr<JS::NonnullGCPtr<TrackEvent>> TrackEvent::construct_impl(JS::Realm& realm, FlyString const& event_name, TrackEventInit const& event_init)
+{
+    return create(realm, event_name, event_init);
+}
+
+TrackEvent::TrackEvent(JS::Realm& realm, FlyString const& event_name, TrackEventInit const& event_init)
+    : DOM::Event(realm, event_name.to_deprecated_fly_string(), event_init)
+    , m_track(event_init.track)
+{
+}
+
+JS::ThrowCompletionOr<void> TrackEvent::initialize(JS::Realm& realm)
+{
+    MUST_OR_THROW_OOM(Base::initialize(realm));
+    set_prototype(&Bindings::ensure_web_prototype<Bindings::TrackEventPrototype>(realm, "TrackEvent"));
+
+    return {};
+}
+
+}
diff --git a/Userland/Libraries/LibWeb/HTML/TrackEvent.h b/Userland/Libraries/LibWeb/HTML/TrackEvent.h
new file mode 100644
index 0000000000..b0c0a85864
--- /dev/null
+++ b/Userland/Libraries/LibWeb/HTML/TrackEvent.h
@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2023, Tim Flynn <trflynn89@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/FlyString.h>
+#include <LibWeb/DOM/Event.h>
+
+namespace Web::HTML {
+
+struct TrackEventInit : public DOM::EventInit {
+    JS::GCPtr<VideoTrack> track;
+};
+
+class TrackEvent : public DOM::Event {
+    WEB_PLATFORM_OBJECT(TrackEvent, DOM::Event);
+
+public:
+    static WebIDL::ExceptionOr<JS::NonnullGCPtr<TrackEvent>> create(JS::Realm&, FlyString const& event_name, TrackEventInit const& event_init = {});
+    static WebIDL::ExceptionOr<JS::NonnullGCPtr<TrackEvent>> construct_impl(JS::Realm&, FlyString const& event_name, TrackEventInit const& event_init);
+
+    // https://html.spec.whatwg.org/multipage/media.html#dom-trackevent-track
+    JS::GCPtr<VideoTrack> track() const { return m_track; }
+
+private:
+    TrackEvent(JS::Realm&, FlyString const& event_name, TrackEventInit const& event_init);
+
+    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
+
+    JS::GCPtr<VideoTrack> m_track;
+};
+
+}
diff --git a/Userland/Libraries/LibWeb/HTML/TrackEvent.idl b/Userland/Libraries/LibWeb/HTML/TrackEvent.idl
new file mode 100644
index 0000000000..3696e6a0de
--- /dev/null
+++ b/Userland/Libraries/LibWeb/HTML/TrackEvent.idl
@@ -0,0 +1,16 @@
+#import <DOM/Event.idl>
+#import <HTML/VideoTrack.idl>
+
+// https://html.spec.whatwg.org/multipage/media.html#trackevent
+[Exposed=Window, UseNewAKString]
+interface TrackEvent : Event {
+    constructor(DOMString type, optional TrackEventInit eventInitDict = {});
+
+    // FIXME: Should be: (VideoTrack or AudioTrack or TextTrack)?
+    readonly attribute VideoTrack? track;
+};
+
+dictionary TrackEventInit : EventInit {
+    // FIXME: Should be: (VideoTrack or AudioTrack or TextTrack)?
+    VideoTrack? track = null;
+};
diff --git a/Userland/Libraries/LibWeb/idl_files.cmake b/Userland/Libraries/LibWeb/idl_files.cmake
index 55d4d84dda..c99071189e 100644
--- a/Userland/Libraries/LibWeb/idl_files.cmake
+++ b/Userland/Libraries/LibWeb/idl_files.cmake
@@ -165,6 +165,7 @@ libweb_js_bindings(HTML/PromiseRejectionEvent)
 libweb_js_bindings(HTML/Storage)
 libweb_js_bindings(HTML/SubmitEvent)
 libweb_js_bindings(HTML/TextMetrics)
+libweb_js_bindings(HTML/TrackEvent)
 libweb_js_bindings(HTML/VideoTrack)
 libweb_js_bindings(HTML/VideoTrackList)
 libweb_js_bindings(HTML/Window GLOBAL)