Everywhere: Hoist the Libraries folder to the top-level

Author: https://github.com/trflynn89
Commit: 93712b24bf
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/2256
Reviewed-by: https://github.com/sideshowbarker

Libraries/LibWeb/HTML/CloseWatcher.h

@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2024, the Ladybird developers.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/Forward.h>
+#include <LibWeb/DOM/EventTarget.h>
+
+namespace Web::HTML {
+
+// https://html.spec.whatwg.org/multipage/interaction.html#closewatcheroptions
+struct CloseWatcherOptions {
+    JS::GCPtr<DOM::AbortSignal> signal;
+};
+
+// https://html.spec.whatwg.org/multipage/interaction.html#the-closewatcher-interface
+class CloseWatcher final : public DOM::EventTarget {
+    WEB_PLATFORM_OBJECT(CloseWatcher, DOM::EventTarget);
+    JS_DECLARE_ALLOCATOR(CloseWatcher);
+
+public:
+    static WebIDL::ExceptionOr<JS::NonnullGCPtr<CloseWatcher>> construct_impl(JS::Realm&, CloseWatcherOptions const& = {});
+    [[nodiscard]] static JS::NonnullGCPtr<CloseWatcher> establish(HTML::Window&);
+
+    bool request_close();
+    void close();
+    void destroy();
+
+    virtual ~CloseWatcher() override = default;
+
+    void set_oncancel(WebIDL::CallbackType*);
+    WebIDL::CallbackType* oncancel();
+
+    void set_onclose(WebIDL::CallbackType*);
+    WebIDL::CallbackType* onclose();
+
+private:
+    CloseWatcher(JS::Realm&);
+
+    virtual void initialize(JS::Realm&) override;
+
+    bool m_is_running_cancel_action { false };
+    bool m_is_active { true };
+};
+
+}