From 97bf9e7953edafd999ff294858c15b8de119aba2 Mon Sep 17 00:00:00 2001
From: Shannon Booth <shannon@serenityos.org>
Date: Fri, 5 Apr 2024 18:15:43 +0200
Subject: [PATCH] LibWeb: Stub out Window-Management proposal extensions to
 Screen API

As defined in https://w3c.github.io/window-management
---
 Userland/Libraries/LibWeb/CSS/Screen.cpp | 21 ++++++++++++++++++++-
 Userland/Libraries/LibWeb/CSS/Screen.h   | 10 ++++++++--
 Userland/Libraries/LibWeb/CSS/Screen.idl |  8 +++++++-
 3 files changed, 35 insertions(+), 4 deletions(-)

diff --git a/Userland/Libraries/LibWeb/CSS/Screen.cpp b/Userland/Libraries/LibWeb/CSS/Screen.cpp
index 9fcf70e8000..e6dc367eff8 100644
--- a/Userland/Libraries/LibWeb/CSS/Screen.cpp
+++ b/Userland/Libraries/LibWeb/CSS/Screen.cpp
@@ -22,7 +22,7 @@ JS::NonnullGCPtr<Screen> Screen::create(HTML::Window& window)
 }
 
 Screen::Screen(HTML::Window& window)
-    : PlatformObject(window.realm())
+    : DOM::EventTarget(window.realm())
     , m_window(window)
 {
 }
@@ -58,4 +58,23 @@ JS::NonnullGCPtr<ScreenOrientation> Screen::orientation()
     return *m_orientation;
 }
 
+// https://w3c.github.io/window-management/#dom-screen-isextended
+bool Screen::is_extended() const
+{
+    dbgln("FIXME: Unimplemented Screen::is_extended");
+    return false;
+}
+
+// https://w3c.github.io/window-management/#dom-screen-onchange
+void Screen::set_onchange(JS::GCPtr<WebIDL::CallbackType> event_handler)
+{
+    set_event_handler_attribute(HTML::EventNames::change, event_handler);
+}
+
+// https://w3c.github.io/window-management/#dom-screen-onchange
+JS::GCPtr<WebIDL::CallbackType> Screen::onchange()
+{
+    return event_handler_attribute(HTML::EventNames::change);
+}
+
 }
diff --git a/Userland/Libraries/LibWeb/CSS/Screen.h b/Userland/Libraries/LibWeb/CSS/Screen.h
index ae84012a5c0..67dd0fb0d49 100644
--- a/Userland/Libraries/LibWeb/CSS/Screen.h
+++ b/Userland/Libraries/LibWeb/CSS/Screen.h
@@ -8,13 +8,14 @@
 
 #include <LibGfx/Rect.h>
 #include <LibWeb/Bindings/PlatformObject.h>
+#include <LibWeb/DOM/EventTarget.h>
 #include <LibWeb/Forward.h>
 #include <LibWeb/HTML/Window.h>
 
 namespace Web::CSS {
 
-class Screen final : public Bindings::PlatformObject {
-    WEB_PLATFORM_OBJECT(Screen, Bindings::PlatformObject);
+class Screen final : public DOM::EventTarget {
+    WEB_PLATFORM_OBJECT(Screen, DOM::EventTarget);
     JS_DECLARE_ALLOCATOR(Screen);
 
 public:
@@ -28,6 +29,11 @@ public:
     u32 pixel_depth() const { return 24; }
     JS::NonnullGCPtr<ScreenOrientation> orientation();
 
+    bool is_extended() const;
+
+    void set_onchange(JS::GCPtr<WebIDL::CallbackType> event_handler);
+    JS::GCPtr<WebIDL::CallbackType> onchange();
+
 private:
     explicit Screen(HTML::Window&);
 
diff --git a/Userland/Libraries/LibWeb/CSS/Screen.idl b/Userland/Libraries/LibWeb/CSS/Screen.idl
index 1266a071b6c..06d30808056 100644
--- a/Userland/Libraries/LibWeb/CSS/Screen.idl
+++ b/Userland/Libraries/LibWeb/CSS/Screen.idl
@@ -1,8 +1,10 @@
 #import <CSS/ScreenOrientation.idl>
+#import <DOM/EventHandler.idl>
+#import <DOM/EventTarget.idl>
 
 // https://w3c.github.io/csswg-drafts/cssom-view-1/#screen
 [Exposed=Window]
-interface Screen {
+interface Screen : EventTarget {
     readonly attribute long availWidth;
     readonly attribute long availHeight;
     readonly attribute long width;
@@ -12,4 +14,8 @@ interface Screen {
 
     // https://w3c.github.io/screen-orientation/#extensions-to-the-screen-interface
     [SameObject] readonly attribute ScreenOrientation orientation;
+
+    // https://w3c.github.io/window-management/#api-extensions-to-screen
+    [SecureContext] readonly attribute boolean isExtended;
+    [SecureContext] attribute EventHandler onchange;
 };