accessible/xpcom/nsAccessibleRelation.cpp

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #include "nsAccessibleRelation.h"
   7
   8 #include "Relation.h"
   9 #include "xpcAccessibleDocument.h"
  10
  11 #include "nsArrayUtils.h"
  12 #include "nsComponentManagerUtils.h"
  13
  14 using namespace mozilla::a11y;
  15
  16 nsAccessibleRelation::nsAccessibleRelation(uint32_t aType, Relation* aRel)
  17     : mType(aType) {
  18   mTargets = do_CreateInstance(NS_ARRAY_CONTRACTID);
  19   Accessible* targetAcc = nullptr;
  20   while ((targetAcc = aRel->Next())) {
  21     mTargets->AppendElement(static_cast<nsIAccessible*>(ToXPC(targetAcc)));
  22   }
  23 }
  24
  25 nsAccessibleRelation::~nsAccessibleRelation() {}
  26
  27 // nsISupports
  28 NS_IMPL_ISUPPORTS(nsAccessibleRelation, nsIAccessibleRelation)
  29
  30 // nsIAccessibleRelation
  31 NS_IMETHODIMP
  32 nsAccessibleRelation::GetRelationType(uint32_t* aType) {
  33   NS_ENSURE_ARG_POINTER(aType);
  34   *aType = mType;
  35   return NS_OK;
  36 }
  37
  38 NS_IMETHODIMP
  39 nsAccessibleRelation::GetTargetsCount(uint32_t* aCount) {
  40   NS_ENSURE_ARG_POINTER(aCount);
  41   *aCount = 0;
  42   return mTargets->GetLength(aCount);
  43 }
  44
  45 NS_IMETHODIMP
  46 nsAccessibleRelation::GetTarget(uint32_t aIndex, nsIAccessible** aTarget) {
  47   NS_ENSURE_ARG_POINTER(aTarget);
  48   nsresult rv = NS_OK;
  49   nsCOMPtr<nsIAccessible> target = do_QueryElementAt(mTargets, aIndex, &rv);
  50   target.forget(aTarget);
  51   return rv;
  52 }
  53
  54 NS_IMETHODIMP
  55 nsAccessibleRelation::GetTargets(nsIArray** aTargets) {
  56   NS_ENSURE_ARG_POINTER(aTargets);
  57   NS_ADDREF(*aTargets = mTargets);
  58   return NS_OK;
  59 }