C++ AccessibleWrap类代码示例

AtkStateSet *
refStateSetCB(AtkObject *aAtkObj)
{
    AtkStateSet *state_set = nsnull;
    state_set = ATK_OBJECT_CLASS(parent_class)->ref_state_set(aAtkObj);

    AccessibleWrap* accWrap = GetAccessibleWrap(aAtkObj);
    if (!accWrap) {
        TranslateStates(states::DEFUNCT, state_set);
        return state_set;
    }

    // Map states
    TranslateStates(accWrap->State(), state_set);

    return state_set;
}

STDMETHODIMP
ia2Accessible::scrollToPoint(enum IA2CoordinateType aCoordType,
                              long aX, long aY)
{
  AccessibleWrap* acc = static_cast<AccessibleWrap*>(this);
  if (acc->IsDefunct())
    return CO_E_OBJNOTCONNECTED;

  uint32_t geckoCoordType = (aCoordType == IA2_COORDTYPE_SCREEN_RELATIVE) ?
    nsIAccessibleCoordinateType::COORDTYPE_SCREEN_RELATIVE :
    nsIAccessibleCoordinateType::COORDTYPE_PARENT_RELATIVE;

  MOZ_ASSERT(!acc->IsProxy());
  acc->ScrollToPoint(geckoCoordType, aX, aY);

  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;
}

// set methods
static gboolean
addTextSelectionCB(AtkText *aText,
                   gint aStartOffset,
                   gint aEndOffset)
{
  AccessibleWrap* accWrap = GetAccessibleWrap(ATK_OBJECT(aText));
  if (!accWrap)
    return FALSE;

  HyperTextAccessible* text = accWrap->AsHyperText();
  if (!text || !text->IsTextRole())
    return false;

    nsresult rv = text->AddSelection(aStartOffset, aEndOffset);

    return NS_SUCCEEDED(rv) ? TRUE : FALSE;
}

void
a11y::ProxyDestroyed(ProxyAccessible* aProxy)
{
  AccessibleWrap* wrapper =
    reinterpret_cast<AccessibleWrap*>(aProxy->GetWrapper());
  MOZ_ASSERT(wrapper);
  if (!wrapper)
    return;

  if (aProxy->IsDoc() && nsWinUtils::IsWindowEmulationStarted()) {
    aProxy->AsDoc()->SetEmulatedWindowHandle(nullptr);
  }

  wrapper->Shutdown();
  aProxy->SetWrapper(0);
  wrapper->Release();
}

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
}

const gchar*
getNameCB(AtkObject* aAtkObj)
{
  nsAutoString name;
  AccessibleWrap* accWrap = GetAccessibleWrap(aAtkObj);
  if (accWrap)
    accWrap->Name(name);
  else if (ProxyAccessible* proxy = GetProxy(aAtkObj))
    proxy->Name(name);
  else
    return nullptr;

  // XXX Firing an event from here does not seem right
  MaybeFireNameChange(aAtkObj, name);

  return aAtkObj->name;
}

static AtkObject*
refAtCB(AtkTable* aTable, gint aRowIdx, gint aColIdx)
{
  AccessibleWrap* accWrap = GetAccessibleWrap(ATK_OBJECT(aTable));
  if (!accWrap || aRowIdx < 0 || aColIdx < 0)
    return nullptr;

  Accessible* cell = accWrap->AsTable()->CellAt(aRowIdx, aColIdx);
  if (!cell)
    return nullptr;

  AtkObject* cellAtkObj = AccessibleWrap::GetAtkObject(cell);
  if (cellAtkObj)
    g_object_ref(cellAtkObj);

  return cellAtkObj;
}

void
a11y::ProxyDestroyed(ProxyAccessible* aProxy)
{
  AccessibleWrap* wrapper =
    reinterpret_cast<AccessibleWrap*>(aProxy->GetWrapper());

  // If aProxy is a document that was created, but
  // RecvPDocAccessibleConstructor failed then aProxy->GetWrapper() will be
  // null.
  if (!wrapper) {
    return;
  }

  wrapper->Shutdown();
  aProxy->SetWrapper(0);
  wrapper->Release();
}

static AtkObject*
refSelectionCB(AtkSelection *aSelection, gint i)
{
  AccessibleWrap* accWrap = GetAccessibleWrap(ATK_OBJECT(aSelection));
  if (!accWrap || !accWrap->IsSelect())
    return nullptr;

  Accessible* selectedItem = accWrap->GetSelectedItem(i);
  if (!selectedItem)
    return nullptr;

  AtkObject* atkObj = AccessibleWrap::GetAtkObject(selectedItem);
  if (atkObj)
    g_object_ref(atkObj);

  return atkObj;
}

STDMETHODIMP
ia2Accessible::get_states(AccessibleStates* aStates) {
  if (!aStates) return E_INVALIDARG;
  *aStates = 0;

  // XXX: bug 344674 should come with better approach that we have here.

  AccessibleWrap* acc = static_cast<AccessibleWrap*>(this);
  if (acc->IsDefunct()) {
    *aStates = IA2_STATE_DEFUNCT;
    return S_OK;
  }

  uint64_t state;
  MOZ_ASSERT(!acc->IsProxy());
  state = acc->State();

  if (state & states::INVALID) *aStates |= IA2_STATE_INVALID_ENTRY;
  if (state & states::REQUIRED) *aStates |= IA2_STATE_REQUIRED;

  // The following IA2 states are not supported by Gecko
  // IA2_STATE_ARMED
  // IA2_STATE_MANAGES_DESCENDANTS
  // IA2_STATE_ICONIFIED
  // IA2_STATE_INVALID // This is not a state, it is the absence of a state

  if (state & states::ACTIVE) *aStates |= IA2_STATE_ACTIVE;
  if (state & states::DEFUNCT) *aStates |= IA2_STATE_DEFUNCT;
  if (state & states::EDITABLE) *aStates |= IA2_STATE_EDITABLE;
  if (state & states::HORIZONTAL) *aStates |= IA2_STATE_HORIZONTAL;
  if (state & states::MODAL) *aStates |= IA2_STATE_MODAL;
  if (state & states::MULTI_LINE) *aStates |= IA2_STATE_MULTI_LINE;
  if (state & states::OPAQUE1) *aStates |= IA2_STATE_OPAQUE;
  if (state & states::SELECTABLE_TEXT) *aStates |= IA2_STATE_SELECTABLE_TEXT;
  if (state & states::SINGLE_LINE) *aStates |= IA2_STATE_SINGLE_LINE;
  if (state & states::STALE) *aStates |= IA2_STATE_STALE;
  if (state & states::SUPPORTS_AUTOCOMPLETION)
    *aStates |= IA2_STATE_SUPPORTS_AUTOCOMPLETION;
  if (state & states::TRANSIENT) *aStates |= IA2_STATE_TRANSIENT;
  if (state & states::VERTICAL) *aStates |= IA2_STATE_VERTICAL;
  if (state & states::CHECKED) *aStates |= IA2_STATE_CHECKABLE;
  if (state & states::PINNED) *aStates |= IA2_STATE_PINNED;

  return S_OK;
}

AtkRelationSet *
refRelationSetCB(AtkObject *aAtkObj)
{
  AtkRelationSet* relation_set =
    ATK_OBJECT_CLASS(parent_class)->ref_relation_set(aAtkObj);

  AccessibleWrap* accWrap = GetAccessibleWrap(aAtkObj);
  if (!accWrap)
    return relation_set;

  PRUint32 relationTypes[] = {
    nsIAccessibleRelation::RELATION_LABELLED_BY,
    nsIAccessibleRelation::RELATION_LABEL_FOR,
    nsIAccessibleRelation::RELATION_NODE_CHILD_OF,
    nsIAccessibleRelation::RELATION_CONTROLLED_BY,
    nsIAccessibleRelation::RELATION_CONTROLLER_FOR,
    nsIAccessibleRelation::RELATION_EMBEDS,
    nsIAccessibleRelation::RELATION_FLOWS_TO,
    nsIAccessibleRelation::RELATION_FLOWS_FROM,
    nsIAccessibleRelation::RELATION_DESCRIBED_BY,
    nsIAccessibleRelation::RELATION_DESCRIPTION_FOR,
  };

  for (PRUint32 i = 0; i < ArrayLength(relationTypes); i++) {
    AtkRelationType atkType = static_cast<AtkRelationType>(relationTypes[i]);
    AtkRelation* atkRelation =
      atk_relation_set_get_relation_by_type(relation_set, atkType);
    if (atkRelation)
      atk_relation_set_remove(relation_set, atkRelation);

    Relation rel(accWrap->RelationByType(relationTypes[i]));
    nsTArray<AtkObject*> targets;
    Accessible* tempAcc = nsnull;
    while ((tempAcc = rel.Next()))
      targets.AppendElement(AccessibleWrap::GetAtkObject(tempAcc));

    if (targets.Length()) {
      atkRelation = atk_relation_new(targets.Elements(), targets.Length(), atkType);
      atk_relation_set_add(relation_set, atkRelation);
      g_object_unref(atkRelation);
    }
  }

  return relation_set;
}

const gchar *
getDocumentAttributeValueCB(AtkDocument *aDocument,
                            const gchar *aAttrName)
{
  ProxyAccessible* proxy = nullptr;
  DocAccessible* document = nullptr;
  AccessibleWrap* accWrap = GetAccessibleWrap(ATK_OBJECT(aDocument));
  if (accWrap) {
    if (!accWrap->IsDoc()) {
      return nullptr;
    }

    document = accWrap->AsDoc();
  } else {
    proxy = GetProxy(ATK_OBJECT(aDocument));
    if (!proxy) {
      return nullptr;
    }
  }

  nsAutoString attrValue;
  if (!strcasecmp(aAttrName, kDocTypeName)) {
    if (document) {
      document->DocType(attrValue);
    } else {
      proxy->DocType(attrValue);
    }
  } else if (!strcasecmp(aAttrName, kDocUrlName)) {
    if (document) {
      document->URL(attrValue);
    } else {
      proxy->URL(attrValue);
    }
  } else if (!strcasecmp(aAttrName, kMimeTypeName)) {
    if (document) {
      document->MimeType(attrValue);
    } else {
      proxy->MimeType(attrValue);
    }
  } else {
    return nullptr;
  }

  return attrValue.IsEmpty() ? nullptr : AccessibleWrap::ReturnString(attrValue);
}

static AtkAttributeSet*
getDefaultAttributesCB(AtkText *aText)
{
  AccessibleWrap* accWrap = GetAccessibleWrap(ATK_OBJECT(aText));
  if (!accWrap)
    return nullptr;

  HyperTextAccessible* text = accWrap->AsHyperText();
  if (!text || !text->IsTextRole())
    return nullptr;

    nsCOMPtr<nsIPersistentProperties> attributes;
    nsresult rv = text->GetDefaultTextAttributes(getter_AddRefs(attributes));
    if (NS_FAILED(rv))
        return nullptr;

    return ConvertToAtkAttributeSet(attributes);
}

static gboolean
setTextSelectionCB(AtkText *aText, gint aSelectionNum,
                   gint aStartOffset, gint aEndOffset)
{
  AccessibleWrap* accWrap = GetAccessibleWrap(ATK_OBJECT(aText));
  if (accWrap) {
    HyperTextAccessible* text = accWrap->AsHyperText();
    if (!text || !text->IsTextRole()) {
      return FALSE;
    }

    return text->SetSelectionBoundsAt(aSelectionNum, aStartOffset, aEndOffset);
  } else if (ProxyAccessible* proxy = GetProxy(ATK_OBJECT(aText))) {
    return proxy->SetSelectionBoundsAt(aSelectionNum, aStartOffset, aEndOffset);
  }

  return FALSE;
}