From 7f45a9e9c1ae40e7077a2a661738192832fdc13e Mon Sep 17 00:00:00 2001
From: Igor Pissolati <igo08an@hotmail.com>
Date: Sat, 9 Apr 2022 12:45:05 -0300
Subject: [PATCH] LibWeb: Add "which" attribute to UIEvent

This is non-standard but is supported by all major browsers.
---
 Userland/Libraries/LibWeb/UIEvents/KeyboardEvent.h | 2 ++
 Userland/Libraries/LibWeb/UIEvents/MouseEvent.h    | 2 ++
 Userland/Libraries/LibWeb/UIEvents/UIEvent.h       | 1 +
 Userland/Libraries/LibWeb/UIEvents/UIEvent.idl     | 2 ++
 4 files changed, 7 insertions(+)

diff --git a/Userland/Libraries/LibWeb/UIEvents/KeyboardEvent.h b/Userland/Libraries/LibWeb/UIEvents/KeyboardEvent.h
index 3276d54cec9..0901fb44b90 100644
--- a/Userland/Libraries/LibWeb/UIEvents/KeyboardEvent.h
+++ b/Userland/Libraries/LibWeb/UIEvents/KeyboardEvent.h
@@ -58,6 +58,8 @@ public:
 
     bool get_modifier_state(String const& key_arg);
 
+    virtual u32 which() const override { return m_key_code; }
+
 private:
     KeyboardEvent(FlyString const& event_name, KeyboardEventInit const& event_init)
         : UIEvent(event_name, event_init)
diff --git a/Userland/Libraries/LibWeb/UIEvents/MouseEvent.h b/Userland/Libraries/LibWeb/UIEvents/MouseEvent.h
index 53186672838..bfacfcd106a 100644
--- a/Userland/Libraries/LibWeb/UIEvents/MouseEvent.h
+++ b/Userland/Libraries/LibWeb/UIEvents/MouseEvent.h
@@ -45,6 +45,8 @@ public:
 
     i16 button() const { return m_button; }
 
+    virtual u32 which() const override { return m_button + 1; }
+
 private:
     MouseEvent(FlyString const& event_name, MouseEventInit const& event_init);
 
diff --git a/Userland/Libraries/LibWeb/UIEvents/UIEvent.h b/Userland/Libraries/LibWeb/UIEvents/UIEvent.h
index 4da9382559c..9be4446a615 100644
--- a/Userland/Libraries/LibWeb/UIEvents/UIEvent.h
+++ b/Userland/Libraries/LibWeb/UIEvents/UIEvent.h
@@ -35,6 +35,7 @@ public:
 
     HTML::Window const* view() const { return m_view; }
     int detail() const { return m_detail; }
+    virtual u32 which() const { return 0; }
 
     void init_ui_event(String const& type, bool bubbles, bool cancelable, HTML::Window* view, int detail)
     {
diff --git a/Userland/Libraries/LibWeb/UIEvents/UIEvent.idl b/Userland/Libraries/LibWeb/UIEvents/UIEvent.idl
index 94431c183fd..36e4a8885ab 100644
--- a/Userland/Libraries/LibWeb/UIEvents/UIEvent.idl
+++ b/Userland/Libraries/LibWeb/UIEvents/UIEvent.idl
@@ -7,6 +7,8 @@ interface UIEvent : Event {
 
     // NOTE: This is "deprecated, but supported for backwards-compatibility with widely-deployed implementations."
     [ImplementedAs=init_ui_event] undefined initUIEvent(DOMString typeArg, optional boolean bubblesArg = false, optional boolean cancelableArg = false, optional Window? viewArg = null, optional long detailArg = 0);
+
+    readonly attribute unsigned long which;
 };
 
 dictionary UIEventInit : EventInit {