accessible/base/EmbeddedObjCollector.cpp

   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 #include "EmbeddedObjCollector.h"
   6
   7 #include "Accessible.h"
   8
   9 using namespace mozilla::a11y;
  10
  11 uint32_t EmbeddedObjCollector::Count() {
  12   EnsureNGetIndex(nullptr);
  13   return mObjects.Length();
  14 }
  15
  16 Accessible* EmbeddedObjCollector::GetAccessibleAt(uint32_t aIndex) {
  17   Accessible* accessible = mObjects.SafeElementAt(aIndex, nullptr);
  18   if (accessible) return accessible;
  19
  20   return EnsureNGetObject(aIndex);
  21 }
  22
  23 Accessible* EmbeddedObjCollector::EnsureNGetObject(uint32_t aIndex) {
  24   uint32_t childCount = mRoot->ChildCount();
  25   while (mRootChildIdx < childCount) {
  26     Accessible* child = mRoot->GetChildAt(mRootChildIdx++);
  27     if (child->IsText()) continue;
  28
  29     AppendObject(child);
  30     if (mObjects.Length() - 1 == aIndex) return mObjects[aIndex];
  31   }
  32
  33   return nullptr;
  34 }
  35
  36 int32_t EmbeddedObjCollector::EnsureNGetIndex(Accessible* aAccessible) {
  37   uint32_t childCount = mRoot->ChildCount();
  38   while (mRootChildIdx < childCount) {
  39     Accessible* child = mRoot->GetChildAt(mRootChildIdx++);
  40     if (child->IsText()) continue;
  41
  42     AppendObject(child);
  43     if (child == aAccessible) return mObjects.Length() - 1;
  44   }
  45
  46   return -1;
  47 }
  48
  49 int32_t EmbeddedObjCollector::GetIndexAt(Accessible* aAccessible) {
  50   if (aAccessible->mParent != mRoot) return -1;
  51
  52   MOZ_ASSERT(!aAccessible->IsProxy());
  53   if (aAccessible->mInt.mIndexOfEmbeddedChild != -1)
  54     return aAccessible->mInt.mIndexOfEmbeddedChild;
  55
  56   return !aAccessible->IsText() ? EnsureNGetIndex(aAccessible) : -1;
  57 }
  58
  59 void EmbeddedObjCollector::AppendObject(Accessible* aAccessible) {
  60   MOZ_ASSERT(!aAccessible->IsProxy());
  61   aAccessible->mInt.mIndexOfEmbeddedChild = mObjects.Length();
  62   mObjects.AppendElement(aAccessible);
  63 }