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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef AccGroupInfo_h_
+#define AccGroupInfo_h_
+
+#include "nsISupportsImpl.h"
+#include "mozilla/MemoryReporting.h"
+#include "Role.h"
+
+namespace mozilla {
+namespace a11y {
+
+class Accessible;
+
+/**
+ * Calculate and store group information.
+ */
+class AccGroupInfo {
+ public:
+ MOZ_COUNTED_DTOR(AccGroupInfo)
+
+ AccGroupInfo() = default;
+ AccGroupInfo(AccGroupInfo&&) = default;
+ AccGroupInfo& operator=(AccGroupInfo&&) = default;
+
+ /**
+ * Return 1-based position in the group.
+ */
+ uint32_t PosInSet() const { return mPosInSet; }
+
+ /**
+ * Return a number of items in the group.
+ */
+ uint32_t SetSize() const { return mSetSize; }
+
+ /**
+ * Return a direct or logical parent of the accessible that this group info is
+ * created for.
+ */
+ Accessible* ConceptualParent() const;
+
+ /**
+ * Update group information.
+ */
+ void Update();
+
+ /**
+ * Create group info.
+ */
+ static AccGroupInfo* CreateGroupInfo(const Accessible* aAccessible);
+
+ /**
+ * Return a first item for the given container.
+ */
+ static Accessible* FirstItemOf(const Accessible* aContainer);
+
+ /**
+ * Return total number of items in container, and if it is has nested
+ * collections.
+ */
+ static uint32_t TotalItemCount(Accessible* aContainer, bool* aIsHierarchical);
+
+ /**
+ * Return next item of the same group to the given item.
+ */
+ static Accessible* NextItemTo(Accessible* aItem);
+
+ size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf);
+
+ protected:
+ AccGroupInfo(const Accessible* aItem, a11y::role aRole);
+
+ private:
+ AccGroupInfo(const AccGroupInfo&) = delete;
+ AccGroupInfo& operator=(const AccGroupInfo&) = delete;
+
+ /**
+ * Return true if the given parent and child roles should have their node
+ * relations reported.
+ */
+ static bool ShouldReportRelations(a11y::role aRole, a11y::role aParentRole);
+
+ /**
+ * Return ARIA level value or the default one if ARIA is missed for the
+ * given accessible.
+ */
+ static int32_t GetARIAOrDefaultLevel(const Accessible* aAccessible);
+
+ uint32_t mPosInSet;
+ uint32_t mSetSize;
+ uint64_t mParentId;
+ const Accessible* mItem;
+ a11y::role mRole;
+};
+
+} // namespace a11y
+} // namespace mozilla
+
+#endif