C++ AccessibleWrap::IsDefunct方法代码示例

STDMETHODIMP
ia2Accessible::get_groupPosition(long* aGroupLevel,
                                 long* aSimilarItemsInGroup,
                                 long* aPositionInGroup)
{
  if (!aGroupLevel || !aSimilarItemsInGroup || !aPositionInGroup)
    return E_INVALIDARG;

  *aGroupLevel = 0;
  *aSimilarItemsInGroup = 0;
  *aPositionInGroup = 0;

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

  GroupPos groupPos = acc->GroupPosition();

  // Group information for accessibles having level only (like html headings
  // elements) isn't exposed by this method. AT should look for 'level' object
  // attribute.
  if (!groupPos.setSize && !groupPos.posInSet)
    return S_FALSE;

  *aGroupLevel = groupPos.level;
  *aSimilarItemsInGroup = groupPos.setSize;
  *aPositionInGroup = groupPos.posInSet;

  return S_OK;
}

STDMETHODIMP
ia2Accessible::get_accessibleWithCaret(IUnknown** aAccessible,
                                       long* aCaretOffset)
{
  if (!aAccessible || !aCaretOffset)
    return E_INVALIDARG;

  *aAccessible = nullptr;
  *aCaretOffset = -1;

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

  int32_t caretOffset = -1;
  Accessible* accWithCaret = SelectionMgr()->AccessibleWithCaret(&caretOffset);
  if (!accWithCaret || acc->Document() != accWithCaret->Document())
    return S_FALSE;

  Accessible* child = accWithCaret;
  while (!child->IsDoc() && child != acc)
    child = child->Parent();

  if (child != acc)
    return S_FALSE;

  *aAccessible =  static_cast<IAccessible2*>(
    static_cast<AccessibleWrap*>(accWithCaret));
  (*aAccessible)->AddRef();
  *aCaretOffset = caretOffset;
  return S_OK;
}

STDMETHODIMP
ia2Accessible::get_windowHandle(HWND* aWindowHandle) {
  if (!aWindowHandle) return E_INVALIDARG;
  *aWindowHandle = 0;

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

  *aWindowHandle = AccessibleWrap::GetHWNDFor(acc);
  return S_OK;
}

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::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
ia2Accessible::get_locale(IA2Locale* aLocale)
{
  if (!aLocale)
    return E_INVALIDARG;

  // Language codes consist of a primary code and a possibly empty series of
  // subcodes: language-code = primary-code ( "-" subcode )*
  // Two-letter primary codes are reserved for [ISO639] language abbreviations.
  // Any two-letter subcode is understood to be a [ISO3166] country code.

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

  nsAutoString lang;
  acc->Language(lang);

  // If primary code consists from two letters then expose it as language.
  int32_t offset = lang.FindChar('-', 0);
  if (offset == -1) {
    if (lang.Length() == 2) {
      aLocale->language = ::SysAllocString(lang.get());
      return S_OK;
    }
  } else if (offset == 2) {
    aLocale->language = ::SysAllocStringLen(lang.get(), 2);

    // If the first subcode consists from two letters then expose it as
    // country.
    offset = lang.FindChar('-', 3);
    if (offset == -1) {
      if (lang.Length() == 5) {
        aLocale->country = ::SysAllocString(lang.get() + 3);
        return S_OK;
      }
    } else if (offset == 5) {
      aLocale->country = ::SysAllocStringLen(lang.get() + 3, 2);
    }
  }

  // Expose as a string if primary code or subcode cannot point to language or
  // country abbreviations or if there are more than one subcode.
  aLocale->variant = ::SysAllocString(lang.get());
  return S_OK;
}

STDMETHODIMP
ia2AccessibleComponent::get_foreground(IA2Color* aForeground)
{
  A11Y_TRYBLOCK_BEGIN

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

  nsIFrame* frame = acc->GetFrame();
  if (frame)
    *aForeground = frame->StyleColor()->mColor;

  return S_OK;

  A11Y_TRYBLOCK_END
}

STDMETHODIMP
ia2AccessibleComponent::get_locationInParent(long* aX, long* aY)
{
  A11Y_TRYBLOCK_BEGIN

  *aX = 0;
  *aY = 0;

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

  // If the object is not on any screen the returned position is (0,0).
  uint64_t state = acc->State();
  if (state & states::INVISIBLE)
    return S_OK;

  int32_t x = 0, y = 0, width = 0, height = 0;
  nsresult rv = acc->GetBounds(&x, &y, &width, &height);
  if (NS_FAILED(rv))
    return GetHRESULT(rv);

  Accessible* parentAcc = acc->Parent();

  // The coordinates of the returned position are relative to this object's
  // parent or relative to the screen on which this object is rendered if it
  // has no parent.
  if (!parentAcc) {
    *aX = x;
    *aY = y;
    return S_OK;
  }

  // The coordinates of the bounding box are given relative to the parent's
  // coordinate system.
  int32_t parentx = 0, parenty = 0;
  rv = acc->GetBounds(&parentx, &parenty, &width, &height);
  if (NS_FAILED(rv))
    return GetHRESULT(rv);

  *aX = x - parentx;
  *aY = y - parenty;
  return S_OK;

  A11Y_TRYBLOCK_END
}

const gchar *
getDescriptionCB(AtkObject *aAtkObj)
{
    AccessibleWrap* accWrap = GetAccessibleWrap(aAtkObj);
    if (!accWrap || accWrap->IsDefunct())
        return nsnull;

    /* nsIAccessible is responsible for the non-NULL description */
    nsAutoString uniDesc;
    accWrap->Description(uniDesc);

    NS_ConvertUTF8toUTF16 objDesc(aAtkObj->description);
    if (!uniDesc.Equals(objDesc))
        atk_object_set_description(aAtkObj,
                                   NS_ConvertUTF16toUTF8(uniDesc).get());

    return aAtkObj->description;
}

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;
}

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;
}

const gchar *
getDescriptionCB(AtkObject *aAtkObj)
{
  nsAutoString uniDesc;
  AccessibleWrap* accWrap = GetAccessibleWrap(aAtkObj);
  if (accWrap) {
    if (accWrap->IsDefunct())
      return nullptr;

    accWrap->Description(uniDesc);
  } else if (ProxyAccessible* proxy = GetProxy(aAtkObj)) {
    proxy->Description(uniDesc);
  } else {
    return nullptr;
  }

    NS_ConvertUTF8toUTF16 objDesc(aAtkObj->description);
    if (!uniDesc.Equals(objDesc))
        atk_object_set_description(aAtkObj,
                                   NS_ConvertUTF16toUTF8(uniDesc).get());

    return aAtkObj->description;
}