LibWeb: Implement the SVG title element

Author: https://github.com/trflynn89
Commit: https://github.com/SerenityOS/serenity/commit/e2e4e6da52
Pull-request: https://github.com/SerenityOS/serenity/pull/19325

Userland/Libraries/LibWeb/CMakeLists.txt

@@ -524,6 +524,7 @@ set(SOURCES
     SVG/SVGStopElement.cpp
     SVG/SVGSymbolElement.cpp
     SVG/SVGTextContentElement.cpp
+    SVG/SVGTitleElement.cpp
     SVG/SVGUseElement.cpp
     SVG/TagNames.cpp
     SVG/ViewBox.cpp

Userland/Libraries/LibWeb/DOM/ElementFactory.cpp

@@ -99,6 +99,7 @@
 #include <LibWeb/SVG/SVGStopElement.h>
 #include <LibWeb/SVG/SVGSymbolElement.h>
 #include <LibWeb/SVG/SVGTextContentElement.h>
+#include <LibWeb/SVG/SVGTitleElement.h>
 #include <LibWeb/SVG/SVGUseElement.h>
 #include <LibWeb/SVG/TagNames.h>
 #include <LibWeb/WebIDL/AbstractOperations.h>
@@ -459,6 +460,8 @@ static WebIDL::ExceptionOr<JS::GCPtr<SVG::SVGElement>> create_svg_element(JS::Re
         return MUST_OR_THROW_OOM(realm.heap().allocate<SVG::SVGSymbolElement>(realm, document, move(qualified_name)));
     if (local_name == SVG::TagNames::text)
         return MUST_OR_THROW_OOM(realm.heap().allocate<SVG::SVGTextContentElement>(realm, document, move(qualified_name)));
+    if (local_name == SVG::TagNames::title)
+        return MUST_OR_THROW_OOM(realm.heap().allocate<SVG::SVGTitleElement>(realm, document, move(qualified_name)));
     if (local_name == SVG::TagNames::use)
         return MUST_OR_THROW_OOM(realm.heap().allocate<SVG::SVGUseElement>(realm, document, move(qualified_name)));
 

Userland/Libraries/LibWeb/Forward.h

@@ -559,6 +559,7 @@ class SVGPolygonElement;
 class SVGPolylineElement;
 class SVGRectElement;
 class SVGSVGElement;
+class SVGTitleElement;
 }
 
 namespace Web::UIEvents {

Userland/Libraries/LibWeb/SVG/SVGTitleElement.cpp

@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2023, Tim Flynn <trflynn89@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibWeb/Bindings/Intrinsics.h>
+#include <LibWeb/DOM/Document.h>
+#include <LibWeb/SVG/SVGTitleElement.h>
+
+namespace Web::SVG {
+
+SVGTitleElement::SVGTitleElement(DOM::Document& document, DOM::QualifiedName qualified_name)
+    : SVGElement(document, move(qualified_name))
+{
+}
+
+JS::ThrowCompletionOr<void> SVGTitleElement::initialize(JS::Realm& realm)
+{
+    MUST_OR_THROW_OOM(Base::initialize(realm));
+    set_prototype(&Bindings::ensure_web_prototype<Bindings::SVGTitleElementPrototype>(realm, "SVGTitleElement"));
+
+    return {};
+}
+
+JS::GCPtr<Layout::Node> SVGTitleElement::create_layout_node(NonnullRefPtr<CSS::StyleProperties>)
+{
+    return nullptr;
+}
+
+void SVGTitleElement::children_changed()
+{
+    Base::children_changed();
+
+    auto* page = document().page();
+    if (!page)
+        return;
+    if (document().browsing_context() != &page->top_level_browsing_context())
+        return;
+
+    auto* document_element = document().document_element();
+
+    if (document_element == parent() && is<SVGElement>(document_element))
+        page->client().page_did_change_title(document().title());
+}
+
+}

Userland/Libraries/LibWeb/SVG/SVGTitleElement.h

@@ -0,0 +1,25 @@
+/*
+ * Copyright (c) 2023, Tim Flynn <trflynn89@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <LibWeb/SVG/SVGElement.h>
+
+namespace Web::SVG {
+
+class SVGTitleElement final : public SVGElement {
+    WEB_PLATFORM_OBJECT(SVGTitleElement, SVGElement);
+
+private:
+    SVGTitleElement(DOM::Document&, DOM::QualifiedName);
+
+    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
+
+    virtual JS::GCPtr<Layout::Node> create_layout_node(NonnullRefPtr<CSS::StyleProperties>) override;
+    virtual void children_changed() override;
+};
+
+}

Userland/Libraries/LibWeb/SVG/SVGTitleElement.idl

@@ -0,0 +1,6 @@
+#import <SVG/SVGElement.idl>
+
+// https://svgwg.org/svg2-draft/struct.html#InterfaceSVGSVGElement
+[Exposed=Window]
+interface SVGTitleElement : SVGElement {
+};

Userland/Libraries/LibWeb/idl_files.cmake

@@ -213,6 +213,7 @@ libweb_js_bindings(SVG/SVGSVGElement)
 libweb_js_bindings(SVG/SVGStopElement)
 libweb_js_bindings(SVG/SVGSymbolElement)
 libweb_js_bindings(SVG/SVGTextContentElement)
+libweb_js_bindings(SVG/SVGTitleElement)
 libweb_js_bindings(SVG/SVGUseElement)
 libweb_js_bindings(Selection/Selection)
 libweb_js_bindings(UIEvents/FocusEvent)