LibWeb: Implement Geometry::DOMRectList

Implement DOMRectList that is used as a return type of
getClientRects functions on Element and Range.

Userland/Libraries/LibWeb/Geometry/DOMRectList.cpp

@@ -0,0 +1,39 @@
+/*
+ * Copyright (c) 2022, DerpyCrabs <derpycrabs@gmail.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibWeb/Geometry/DOMRect.h>
+#include <LibWeb/Geometry/DOMRectList.h>
+
+namespace Web::Geometry {
+
+DOMRectList::DOMRectList(NonnullRefPtrVector<DOMRect>&& rects)
+    : m_rects(move(rects))
+{
+}
+
+// https://drafts.fxtf.org/geometry-1/#dom-domrectlist-length
+u32 DOMRectList::length() const
+{
+    return m_rects.size();
+}
+
+// https://drafts.fxtf.org/geometry-1/#dom-domrectlist-item
+DOMRect const* DOMRectList::item(u32 index) const
+{
+    // The item(index) method, when invoked, must return null when
+    // index is greater than or equal to the number of DOMRect objects associated with the DOMRectList.
+    // Otherwise, the DOMRect object at index must be returned. Indices are zero-based.
+    if (index >= m_rects.size())
+        return nullptr;
+    return &m_rects[index];
+}
+
+bool DOMRectList::is_supported_property_index(u32 index) const
+{
+    return index < m_rects.size();
+}
+
+}

Userland/Libraries/LibWeb/Geometry/DOMRectList.h

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+/*
+ * Copyright (c) 2022, DerpyCrabs <derpycrabs@gmail.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/Noncopyable.h>
+#include <AK/NonnullRefPtrVector.h>
+#include <AK/RefCounted.h>
+#include <AK/Vector.h>
+#include <LibWeb/Bindings/Wrappable.h>
+#include <LibWeb/Forward.h>
+#include <LibWeb/Geometry/DOMRect.h>
+
+namespace Web::Geometry {
+
+// https://drafts.fxtf.org/geometry-1/#DOMRectList
+class DOMRectList final
+    : public RefCounted<DOMRectList>
+    , public Bindings::Wrappable {
+    AK_MAKE_NONCOPYABLE(DOMRectList);
+    AK_MAKE_NONMOVABLE(DOMRectList);
+
+public:
+    using WrapperType = Bindings::DOMRectListWrapper;
+
+    static NonnullRefPtr<DOMRectList> create(NonnullRefPtrVector<DOMRect>&& rects)
+    {
+        return adopt_ref(*new DOMRectList(move(rects)));
+    }
+
+    ~DOMRectList() = default;
+
+    u32 length() const;
+    DOMRect const* item(u32 index) const;
+
+    bool is_supported_property_index(u32) const;
+
+private:
+    DOMRectList(NonnullRefPtrVector<DOMRect>&& rects);
+
+    NonnullRefPtrVector<DOMRect> m_rects;
+};
+
+}

Userland/Libraries/LibWeb/Geometry/DOMRectList.idl

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+[Exposed=Window]
+interface DOMRectList {
+    getter DOMRect? item(unsigned long index);
+    readonly attribute unsigned long length;
+    iterable<DOMRect>;
+};