C++ AccessibleWrap::IsProxy方法代码示例

STDMETHODIMP
ia2Accessible::get_relations(long aMaxRelations,
                             IAccessibleRelation** aRelation,
                             long *aNRelations)
{
  if (!aRelation || !aNRelations || aMaxRelations <= 0)
    return E_INVALIDARG;
  *aNRelations = 0;

  AccessibleWrap* acc = static_cast<AccessibleWrap*>(this);
  if (acc->IsDefunct())
    return CO_E_OBJNOTCONNECTED;

  MOZ_ASSERT(!acc->IsProxy());

  for (uint32_t idx = 0; idx < ArrayLength(sRelationTypePairs) &&
       *aNRelations < aMaxRelations; idx++) {
    if (sRelationTypePairs[idx].second == IA2_RELATION_NULL)
      continue;

    RelationType relationType = sRelationTypePairs[idx].first;
    Relation rel = acc->RelationByType(relationType);
    RefPtr<ia2AccessibleRelation> ia2Rel =
      new ia2AccessibleRelation(relationType, &rel);
    if (ia2Rel->HasTargets()) {
      ia2Rel.forget(aRelation + (*aNRelations));
      (*aNRelations)++;
    }
  }
  return S_OK;
}

STDMETHODIMP
ia2Accessible::get_attributes(BSTR* aAttributes) {
  if (!aAttributes) return E_INVALIDARG;
  *aAttributes = nullptr;

  AccessibleWrap* acc = static_cast<AccessibleWrap*>(this);
  if (acc->IsDefunct()) return CO_E_OBJNOTCONNECTED;

  // The format is name:value;name:value; with \ for escaping these
  // characters ":;=,\".
  if (!acc->IsProxy()) {
    nsCOMPtr<nsIPersistentProperties> attributes = acc->Attributes();
    return ConvertToIA2Attributes(attributes, aAttributes);
  }

  MOZ_ASSERT(!acc->IsProxy());
  return E_UNEXPECTED;
}

STDMETHODIMP
ia2AccessibleValue::setCurrentValue(VARIANT aValue) {
  if (aValue.vt != VT_R8) return E_INVALIDARG;

  AccessibleWrap* valueAcc = static_cast<AccessibleWrap*>(this);
  MOZ_ASSERT(!valueAcc->IsProxy());

  if (valueAcc->IsDefunct()) return CO_E_OBJNOTCONNECTED;

  return valueAcc->SetCurValue(aValue.dblVal) ? S_OK : E_FAIL;
}

STDMETHODIMP
ia2Accessible::role(long* aRole)
{
  if (!aRole)
    return E_INVALIDARG;
  *aRole = 0;

  AccessibleWrap* acc = static_cast<AccessibleWrap*>(this);
  if (acc->IsDefunct())
    return CO_E_OBJNOTCONNECTED;

#define ROLE(_geckoRole, stringRole, atkRole, macRole, \
             msaaRole, ia2Role, androidClass, nameRule) \
  case roles::_geckoRole: \
    *aRole = ia2Role; \
    break;

  a11y::role geckoRole;
  MOZ_ASSERT(!acc->IsProxy());
  geckoRole = acc->Role();
  switch (geckoRole) {
#include "RoleMap.h"
    default:
      MOZ_CRASH("Unknown role.");
  }

#undef ROLE

  // Special case, if there is a ROLE_ROW inside of a ROLE_TREE_TABLE, then call
  // the IA2 role a ROLE_OUTLINEITEM.
  MOZ_ASSERT(!acc->IsProxy());
  if (geckoRole == roles::ROW) {
    Accessible* xpParent = acc->Parent();
    if (xpParent && xpParent->Role() == roles::TREE_TABLE)
      *aRole = ROLE_SYSTEM_OUTLINEITEM;
  }

  return S_OK;
}

STDMETHODIMP
ia2Accessible::get_relationTargetsOfType(BSTR aType,
                                         long aMaxTargets,
                                         IUnknown*** aTargets,
                                         long* aNTargets)
{
  if (!aTargets || !aNTargets || aMaxTargets < 0)
    return E_INVALIDARG;
  *aNTargets = 0;

  Maybe<RelationType> relationType;
  for (uint32_t idx = 0; idx < ArrayLength(sRelationTypePairs); idx++) {
    if (wcscmp(aType, sRelationTypePairs[idx].second) == 0) {
      relationType.emplace(sRelationTypePairs[idx].first);
      break;
    }
  }
  if (!relationType)
    return E_INVALIDARG;

  AccessibleWrap* acc = static_cast<AccessibleWrap*>(this);
  if (acc->IsDefunct())
    return CO_E_OBJNOTCONNECTED;

  nsTArray<Accessible*> targets;
  MOZ_ASSERT(!acc->IsProxy());
  Relation rel = acc->RelationByType(*relationType);
  Accessible* target = nullptr;
  while ((target = rel.Next()) &&
         static_cast<long>(targets.Length()) <= aMaxTargets) {
    targets.AppendElement(target);
  }

  *aNTargets = targets.Length();
  *aTargets = static_cast<IUnknown**>(
    ::CoTaskMemAlloc(sizeof(IUnknown*) * *aNTargets));
  if (!*aTargets)
    return E_OUTOFMEMORY;

  for (int32_t i = 0; i < *aNTargets; i++) {
    AccessibleWrap* target= static_cast<AccessibleWrap*>(targets[i]);
    (*aTargets)[i] = static_cast<IAccessible2*>(target);
    (*aTargets)[i]->AddRef();
  }

  return S_OK;
}

STDMETHODIMP
ia2AccessibleValue::get_minimumValue(VARIANT* aMinimumValue) {
  if (!aMinimumValue) return E_INVALIDARG;

  VariantInit(aMinimumValue);

  AccessibleWrap* valueAcc = static_cast<AccessibleWrap*>(this);
  double minimumValue;
  MOZ_ASSERT(!valueAcc->IsProxy());
  if (valueAcc->IsDefunct()) {
    return CO_E_OBJNOTCONNECTED;
  }

  minimumValue = valueAcc->MinValue();

  if (IsNaN(minimumValue)) return S_FALSE;

  aMinimumValue->vt = VT_R8;
  aMinimumValue->dblVal = minimumValue;
  return S_OK;
}