Everywhere: Hoist the Libraries folder to the top-level

Libraries/LibCore/Event.cpp

@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <andreas@ladybird.org>
+ * Copyright (c) 2022, the SerenityOS developers.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <AK/WeakPtr.h>
+#include <LibCore/Event.h>
+#include <LibCore/EventReceiver.h>
+
+namespace Core {
+
+ChildEvent::ChildEvent(Type type, EventReceiver& child, EventReceiver* insertion_before_child)
+    : Core::Event(type)
+    , m_child(child.make_weak_ptr())
+    , m_insertion_before_child(AK::make_weak_ptr_if_nonnull(insertion_before_child))
+{
+}
+
+EventReceiver* ChildEvent::child()
+{
+    if (auto ref = m_child.strong_ref())
+        return ref.ptr();
+    return nullptr;
+}
+
+EventReceiver const* ChildEvent::child() const
+{
+    if (auto ref = m_child.strong_ref())
+        return ref.ptr();
+    return nullptr;
+}
+
+EventReceiver* ChildEvent::insertion_before_child()
+{
+    if (auto ref = m_insertion_before_child.strong_ref())
+        return ref.ptr();
+    return nullptr;
+}
+
+EventReceiver const* ChildEvent::insertion_before_child() const
+{
+    if (auto ref = m_insertion_before_child.strong_ref())
+        return ref.ptr();
+    return nullptr;
+}
+
+}