From 774c574ede270c4f8b1255724082b566dd36c0e6 Mon Sep 17 00:00:00 2001
From: Andreas Kling <kling@serenityos.org>
Date: Sat, 16 Mar 2024 14:47:54 +0100
Subject: [PATCH] LibWeb: Add fast_is<T> for UIEvents::MouseEvent

---
 Userland/Libraries/LibWeb/DOM/Event.h           | 5 +++++
 Userland/Libraries/LibWeb/UIEvents/MouseEvent.h | 9 +++++++++
 2 files changed, 14 insertions(+)

diff --git a/Userland/Libraries/LibWeb/DOM/Event.h b/Userland/Libraries/LibWeb/DOM/Event.h
index eeb9784c4fd911d..f9cc2f74e612d27 100644
--- a/Userland/Libraries/LibWeb/DOM/Event.h
+++ b/Userland/Libraries/LibWeb/DOM/Event.h
@@ -144,6 +144,11 @@ class Event : public Bindings::PlatformObject {
 
     Vector<JS::Handle<EventTarget>> composed_path() const;
 
+    template<typename T>
+    bool fast_is() const = delete;
+
+    virtual bool is_mouse_event() const { return false; }
+
 protected:
     void initialize_event(String const&, bool, bool);
 
diff --git a/Userland/Libraries/LibWeb/UIEvents/MouseEvent.h b/Userland/Libraries/LibWeb/UIEvents/MouseEvent.h
index a27d85ffe201ee4..69b8d0852908f4c 100644
--- a/Userland/Libraries/LibWeb/UIEvents/MouseEvent.h
+++ b/Userland/Libraries/LibWeb/UIEvents/MouseEvent.h
@@ -71,6 +71,8 @@ class MouseEvent : public UIEvent {
     virtual void initialize(JS::Realm&) override;
 
 private:
+    virtual bool is_mouse_event() const override { return true; }
+
     void set_event_characteristics();
 
     double m_screen_x { 0 };
@@ -102,3 +104,10 @@ class MouseEvent : public UIEvent {
 };
 
 }
+
+namespace Web::DOM {
+
+template<>
+inline bool Event::fast_is<UIEvents::MouseEvent>() const { return is_mouse_event(); }
+
+}