LibWeb+LibWebView+WebContent: Convert about:settings to a WebUI

Author: https://github.com/trflynn89
Commit: https://github.com/LadybirdBrowser/ladybird/commit/f05b0bfd5f8
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/4068

Libraries/LibWebView/WebUI/SettingsUI.cpp

@@ -0,0 +1,75 @@
+/*
+ * Copyright (c) 2025, Tim Flynn <trflynn89@ladybird.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <AK/JsonArray.h>
+#include <LibURL/Parser.h>
+#include <LibWebView/Application.h>
+#include <LibWebView/SearchEngine.h>
+#include <LibWebView/WebUI/SettingsUI.h>
+
+namespace WebView {
+
+void SettingsUI::register_interfaces()
+{
+    register_interface("loadCurrentSettings"sv, [this](auto const&) {
+        load_current_settings();
+    });
+    register_interface("restoreDefaultSettings"sv, [this](auto const&) {
+        restore_default_settings();
+    });
+    register_interface("setNewTabPageURL"sv, [this](auto const& data) {
+        set_new_tab_page_url(data);
+    });
+    register_interface("loadAvailableSearchEngines"sv, [this](auto const&) {
+        load_available_search_engines();
+    });
+    register_interface("setSearchEngine"sv, [this](auto const& data) {
+        set_search_engine(data);
+    });
+}
+
+void SettingsUI::load_current_settings()
+{
+    auto settings = WebView::Application::settings().serialize_json();
+    async_send_message("loadSettings"sv, settings);
+}
+
+void SettingsUI::restore_default_settings()
+{
+    WebView::Application::settings().restore_defaults();
+    load_current_settings();
+}
+
+void SettingsUI::set_new_tab_page_url(JsonValue const& new_tab_page_url)
+{
+    if (!new_tab_page_url.is_string())
+        return;
+
+    auto parsed_new_tab_page_url = URL::Parser::basic_parse(new_tab_page_url.as_string());
+    if (!parsed_new_tab_page_url.has_value())
+        return;
+
+    WebView::Application::settings().set_new_tab_page_url(parsed_new_tab_page_url.release_value());
+}
+
+void SettingsUI::load_available_search_engines()
+{
+    JsonArray engines;
+    for (auto const& engine : search_engines())
+        engines.must_append(engine.name);
+
+    async_send_message("loadSearchEngines"sv, move(engines));
+}
+
+void SettingsUI::set_search_engine(JsonValue const& search_engine)
+{
+    if (search_engine.is_null())
+        WebView::Application::settings().set_search_engine({});
+    else if (search_engine.is_string())
+        WebView::Application::settings().set_search_engine(search_engine.as_string());
+}
+
+}