tor-browser

The Tor Browser
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AccGroupInfo.h (2403B)

      1 /* This Source Code Form is subject to the terms of the Mozilla Public
      2 * License, v. 2.0. If a copy of the MPL was not distributed with this
      3 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
      4 
      5 #ifndef AccGroupInfo_h_
      6 #define AccGroupInfo_h_
      7 
      8 #include "nsISupportsImpl.h"
      9 #include "mozilla/MemoryReporting.h"
     10 #include "mozilla/a11y/Role.h"
     11 
     12 namespace mozilla {
     13 namespace a11y {
     14 
     15 class Accessible;
     16 
     17 /**
     18 * Calculate and store group information.
     19 */
     20 class AccGroupInfo {
     21 public:
     22  MOZ_COUNTED_DTOR(AccGroupInfo)
     23 
     24  AccGroupInfo() = default;
     25  AccGroupInfo(AccGroupInfo&&) = default;
     26  AccGroupInfo& operator=(AccGroupInfo&&) = default;
     27 
     28  /**
     29   * Return 1-based position in the group.
     30   */
     31  uint32_t PosInSet() const { return mPosInSet; }
     32 
     33  /**
     34   * Return a number of items in the group.
     35   */
     36  uint32_t SetSize() const { return mSetSize; }
     37 
     38  /**
     39   * Return a direct or logical parent of the accessible that this group info is
     40   * created for.
     41   */
     42  Accessible* ConceptualParent() const;
     43 
     44  /**
     45   * Update group information.
     46   */
     47  void Update();
     48 
     49  /**
     50   * Create group info.
     51   */
     52  static AccGroupInfo* CreateGroupInfo(const Accessible* aAccessible);
     53 
     54  /**
     55   * Return a first item for the given container.
     56   */
     57  static Accessible* FirstItemOf(const Accessible* aContainer);
     58 
     59  /**
     60   * Return total number of items in container, and if it is has nested
     61   * collections.
     62   */
     63  static uint32_t TotalItemCount(Accessible* aContainer, bool* aIsHierarchical);
     64 
     65  /**
     66   * Return next item of the same group to the given item.
     67   */
     68  static Accessible* NextItemTo(Accessible* aItem);
     69 
     70  size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf);
     71 
     72 protected:
     73  AccGroupInfo(const Accessible* aItem, a11y::role aRole);
     74 
     75 private:
     76  AccGroupInfo(const AccGroupInfo&) = delete;
     77  AccGroupInfo& operator=(const AccGroupInfo&) = delete;
     78 
     79  /**
     80   * Return true if the given parent and child roles should have their node
     81   * relations reported.
     82   */
     83  static bool ShouldReportRelations(a11y::role aRole, a11y::role aParentRole);
     84 
     85  /**
     86   * Return ARIA level value or the default one if ARIA is missed for the
     87   * given accessible.
     88   */
     89  static int32_t GetARIAOrDefaultLevel(const Accessible* aAccessible);
     90 
     91  uint32_t mPosInSet;
     92  uint32_t mSetSize;
     93  uint64_t mParentId;
     94  const Accessible* mItem;
     95  a11y::role mRole;
     96 };
     97 
     98 }  // namespace a11y
     99 }  // namespace mozilla
    100 
    101 #endif