1 files changed, 101 insertions, 0 deletions
diff --git a/accessible/base/AccGroupInfo.h b/accessible/base/AccGroupInfo.h
new file mode 100644
index 0000000000..a9afa14b8e
--- /dev/null
+++ b/accessible/base/AccGroupInfo.h
@@ -0,0 +1,101 @@
+/* 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 "mozilla/a11y/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