C++ DocAccessible::GetAccessibleOrContainer方法代码示例

Accessible*
FocusManager::FocusedAccessible() const
{
    if (mActiveItem)
        return mActiveItem;

    nsINode* focusedNode = FocusedDOMNode();
    if (focusedNode) {
        DocAccessible* doc =
            GetAccService()->GetDocAccessible(focusedNode->OwnerDoc());
        return doc ? doc->GetAccessibleOrContainer(focusedNode) : nullptr;
    }

    return nullptr;
}

HyperTextAccessible*
nsAccUtils::GetTextContainer(nsINode* aNode)
{
  // Get text accessible containing the result node.
  DocAccessible* doc =
    GetAccService()->GetDocAccessible(aNode->OwnerDoc());
  Accessible* accessible =
    doc ? doc->GetAccessibleOrContainer(aNode) : nullptr;
  if (!accessible)
    return nullptr;

  do {
    HyperTextAccessible* textAcc = accessible->AsHyperText();
    if (textAcc)
      return textAcc;

    accessible = accessible->Parent();
  } while (accessible);

  return nullptr;
}

nsHyperTextAccessible*
nsAccUtils::GetTextAccessibleFromSelection(nsISelection* aSelection)
{
  // Get accessible from selection's focus DOM point (the DOM point where
  // selection is ended).

  nsCOMPtr<nsIDOMNode> focusDOMNode;
  aSelection->GetFocusNode(getter_AddRefs(focusDOMNode));
  if (!focusDOMNode)
    return nsnull;

  PRInt32 focusOffset = 0;
  aSelection->GetFocusOffset(&focusOffset);

  nsCOMPtr<nsINode> focusNode(do_QueryInterface(focusDOMNode));
  nsCOMPtr<nsINode> resultNode =
    nsCoreUtils::GetDOMNodeFromDOMPoint(focusNode, focusOffset);

  // Get text accessible containing the result node.
  DocAccessible* doc = 
    GetAccService()->GetDocAccessible(resultNode->OwnerDoc());
  nsAccessible* accessible = doc ? 
    doc->GetAccessibleOrContainer(resultNode) : nsnull;
  if (!accessible) {
    NS_NOTREACHED("No nsIAccessibleText for selection change event!");
    return nsnull;
  }

  do {
    nsHyperTextAccessible* textAcc = accessible->AsHyperText();
    if (textAcc)
      return textAcc;

    accessible = accessible->Parent();
  } while (accessible);

  NS_NOTREACHED("We must reach document accessible implementing nsIAccessibleText!");
  return nsnull;
}

PLDHashOperator
NotificationController::TextEnumerator(nsCOMPtrHashKey<nsIContent>* aEntry,
                                       void* aUserArg)
{
  DocAccessible* document = static_cast<DocAccessible*>(aUserArg);
  nsIContent* textNode = aEntry->GetKey();
  Accessible* textAcc = document->GetAccessible(textNode);

  // If the text node is not in tree or doesn't have frame then this case should
  // have been handled already by content removal notifications.
  nsINode* containerNode = textNode->GetParentNode();
  if (!containerNode) {
    NS_ASSERTION(!textAcc,
                 "Text node was removed but accessible is kept alive!");
    return PL_DHASH_NEXT;
  }

  nsIFrame* textFrame = textNode->GetPrimaryFrame();
  if (!textFrame) {
    NS_ASSERTION(!textAcc,
                 "Text node isn't rendered but accessible is kept alive!");
    return PL_DHASH_NEXT;
  }

  nsIContent* containerElm = containerNode->IsElement() ?
    containerNode->AsElement() : nullptr;

  nsAutoString text;
  textFrame->GetRenderedText(&text);

  // Remove text accessible if rendered text is empty.
  if (textAcc) {
    if (text.IsEmpty()) {
#ifdef A11Y_LOG
      if (logging::IsEnabled(logging::eTree | logging::eText)) {
        logging::MsgBegin("TREE", "text node lost its content");
        logging::Node("container", containerElm);
        logging::Node("content", textNode);
        logging::MsgEnd();
      }
#endif

      document->ContentRemoved(containerElm, textNode);
      return PL_DHASH_NEXT;
    }

    // Update text of the accessible and fire text change events.
#ifdef A11Y_LOG
    if (logging::IsEnabled(logging::eText)) {
      logging::MsgBegin("TEXT", "text may be changed");
      logging::Node("container", containerElm);
      logging::Node("content", textNode);
      logging::MsgEntry("old text '%s'",
                        NS_ConvertUTF16toUTF8(textAcc->AsTextLeaf()->Text()).get());
      logging::MsgEntry("new text: '%s'",
                        NS_ConvertUTF16toUTF8(text).get());
      logging::MsgEnd();
    }
#endif

    TextUpdater::Run(document, textAcc->AsTextLeaf(), text);
    return PL_DHASH_NEXT;
  }

  // Append an accessible if rendered text is not empty.
  if (!text.IsEmpty()) {
#ifdef A11Y_LOG
    if (logging::IsEnabled(logging::eTree | logging::eText)) {
      logging::MsgBegin("TREE", "text node gains new content");
      logging::Node("container", containerElm);
      logging::Node("content", textNode);
      logging::MsgEnd();
    }
#endif

    // Make sure the text node is in accessible document still.
    Accessible* container = document->GetAccessibleOrContainer(containerNode);
    NS_ASSERTION(container,
                 "Text node having rendered text hasn't accessible document!");
    if (container) {
      nsTArray<nsCOMPtr<nsIContent> > insertedContents;
      insertedContents.AppendElement(textNode);
      document->ProcessContentInserted(container, &insertedContents);
    }
  }

  return PL_DHASH_NEXT;
}

// RootAccessible protected
void
RootAccessible::ProcessDOMEvent(nsIDOMEvent* aDOMEvent)
{
  MOZ_ASSERT(aDOMEvent);
  Event* event = aDOMEvent->InternalDOMEvent();
  nsCOMPtr<nsINode> origTargetNode = do_QueryInterface(event->GetOriginalTarget());

  nsAutoString eventType;
  aDOMEvent->GetType(eventType);

#ifdef A11Y_LOG
  if (logging::IsEnabled(logging::eDOMEvents))
    logging::DOMEvent("processed", origTargetNode, eventType);
#endif

  if (eventType.EqualsLiteral("popuphiding")) {
    HandlePopupHidingEvent(origTargetNode);
    return;
  }

  DocAccessible* targetDocument = GetAccService()->
    GetDocAccessible(origTargetNode->OwnerDoc());
  NS_ASSERTION(targetDocument, "No document while accessible is in document?!");

  Accessible* accessible = 
    targetDocument->GetAccessibleOrContainer(origTargetNode);
  if (!accessible)
    return;

#ifdef MOZ_XUL
  XULTreeAccessible* treeAcc = accessible->AsXULTree();
  if (treeAcc) {
    if (eventType.EqualsLiteral("TreeRowCountChanged")) {
      HandleTreeRowCountChangedEvent(aDOMEvent, treeAcc);
      return;
    }

    if (eventType.EqualsLiteral("TreeInvalidated")) {
      HandleTreeInvalidatedEvent(aDOMEvent, treeAcc);
      return;
    }
  }
#endif

  if (eventType.EqualsLiteral("RadioStateChange")) {
    uint64_t state = accessible->State();
    bool isEnabled = (state & (states::CHECKED | states::SELECTED)) != 0;

    if (accessible->NeedsDOMUIEvent()) {
      nsRefPtr<AccEvent> accEvent =
        new AccStateChangeEvent(accessible, states::CHECKED, isEnabled);
      nsEventShell::FireEvent(accEvent);
    }

    if (isEnabled) {
      FocusMgr()->ActiveItemChanged(accessible);
#ifdef A11Y_LOG
      if (logging::IsEnabled(logging::eFocus))
        logging::ActiveItemChangeCausedBy("RadioStateChange", accessible);
#endif
    }

    return;
  }

  if (eventType.EqualsLiteral("CheckboxStateChange")) {
    if (accessible->NeedsDOMUIEvent()) {
      uint64_t state = accessible->State();
      bool isEnabled = !!(state & states::CHECKED);

      nsRefPtr<AccEvent> accEvent =
        new AccStateChangeEvent(accessible, states::CHECKED, isEnabled);
      nsEventShell::FireEvent(accEvent);
    }
    return;
  }

  Accessible* treeItemAcc = nullptr;
#ifdef MOZ_XUL
  // If it's a tree element, need the currently selected item.
  if (treeAcc) {
    treeItemAcc = accessible->CurrentItem();
    if (treeItemAcc)
      accessible = treeItemAcc;
  }

  if (treeItemAcc && eventType.EqualsLiteral("OpenStateChange")) {
    uint64_t state = accessible->State();
    bool isEnabled = (state & states::EXPANDED) != 0;

    nsRefPtr<AccEvent> accEvent =
      new AccStateChangeEvent(accessible, states::EXPANDED, isEnabled);
    nsEventShell::FireEvent(accEvent);
    return;
  }

  nsINode* targetNode = accessible->GetNode();
  if (treeItemAcc && eventType.EqualsLiteral("select")) {
    // XXX: We shouldn't be based on DOM select event which doesn't provide us
//.........这里部分代码省略.........

// RootAccessible protected
void
RootAccessible::ProcessDOMEvent(nsIDOMEvent* aDOMEvent)
{
  nsCOMPtr<nsIDOMNSEvent> DOMNSEvent(do_QueryInterface(aDOMEvent));
  nsCOMPtr<nsIDOMEventTarget> DOMEventTarget;
  DOMNSEvent->GetOriginalTarget(getter_AddRefs(DOMEventTarget));
  nsCOMPtr<nsINode> origTargetNode(do_QueryInterface(DOMEventTarget));

  nsAutoString eventType;
  aDOMEvent->GetType(eventType);

  if (eventType.EqualsLiteral("popuphiding")) {
    HandlePopupHidingEvent(origTargetNode);
    return;
  }

  DocAccessible* targetDocument = GetAccService()->
    GetDocAccessible(origTargetNode->OwnerDoc());
  NS_ASSERTION(targetDocument, "No document while accessible is in document?!");

  Accessible* accessible = 
    targetDocument->GetAccessibleOrContainer(origTargetNode);
  if (!accessible)
    return;

  nsINode* targetNode = accessible->GetNode();

#ifdef MOZ_XUL
  XULTreeAccessible* treeAcc = accessible->AsXULTree();
  if (treeAcc) {
    if (eventType.EqualsLiteral("TreeRowCountChanged")) {
      HandleTreeRowCountChangedEvent(aDOMEvent, treeAcc);
      return;
    }

    if (eventType.EqualsLiteral("TreeInvalidated")) {
      HandleTreeInvalidatedEvent(aDOMEvent, treeAcc);
      return;
    }
  }
#endif

  if (eventType.EqualsLiteral("RadioStateChange")) {
    PRUint64 state = accessible->State();

    // radiogroup in prefWindow is exposed as a list,
    // and panebutton is exposed as XULListitem in A11y.
    // XULListitemAccessible::GetStateInternal uses STATE_SELECTED in this case,
    // so we need to check states::SELECTED also.
    bool isEnabled = (state & (states::CHECKED | states::SELECTED)) != 0;

    nsRefPtr<AccEvent> accEvent =
      new AccStateChangeEvent(accessible, states::CHECKED, isEnabled);
    nsEventShell::FireEvent(accEvent);

    if (isEnabled) {
      FocusMgr()->ActiveItemChanged(accessible);
      A11YDEBUG_FOCUS_ACTIVEITEMCHANGE_CAUSE("RadioStateChange", accessible)
    }

    return;
  }

PLDHashOperator
NotificationController::TextEnumerator(nsCOMPtrHashKey<nsIContent>* aEntry,
                                       void* aUserArg)
{
  DocAccessible* document = static_cast<DocAccessible*>(aUserArg);
  nsIContent* textNode = aEntry->GetKey();
  Accessible* textAcc = document->GetAccessible(textNode);

  // If the text node is not in tree or doesn't have frame then this case should
  // have been handled already by content removal notifications.
  nsINode* containerNode = textNode->GetNodeParent();
  if (!containerNode) {
    NS_ASSERTION(!textAcc,
                 "Text node was removed but accessible is kept alive!");
    return PL_DHASH_NEXT;
  }

  nsIFrame* textFrame = textNode->GetPrimaryFrame();
  if (!textFrame) {
    NS_ASSERTION(!textAcc,
                 "Text node isn't rendered but accessible is kept alive!");
    return PL_DHASH_NEXT;
  }

  nsIContent* containerElm = containerNode->IsElement() ?
    containerNode->AsElement() : nsnull;

  nsAutoString text;
  textFrame->GetRenderedText(&text);

  // Remove text accessible if rendered text is empty.
  if (textAcc) {
    if (text.IsEmpty()) {
#ifdef DEBUG_NOTIFICATIONS
      PRUint32 index = containerNode->IndexOf(textNode);

      nsCAutoString tag;
      nsCAutoString id;
      if (containerElm) {
        containerElm->Tag()->ToUTF8String(tag);
        nsIAtom* atomid = containerElm->GetID();
        if (atomid)
          atomid->ToUTF8String(id);
      }

      printf("\npending text node removal: container: %[email protected]='%s', index in container: %d\n\n",
             tag.get(), id.get(), index);
#endif

      document->ContentRemoved(containerElm, textNode);
      return PL_DHASH_NEXT;
    }

    // Update text of the accessible and fire text change events.
#ifdef DEBUG_TEXTCHANGE
      PRUint32 index = containerNode->IndexOf(textNode);

      nsCAutoString tag;
      nsCAutoString id;
      if (containerElm) {
        containerElm->Tag()->ToUTF8String(tag);
        nsIAtom* atomid = containerElm->GetID();
        if (atomid)
          atomid->ToUTF8String(id);
      }

      printf("\ntext may be changed: container: %[email protected]='%s', index in container: %d, old text '%s', new text: '%s'\n\n",
             tag.get(), id.get(), index,
             NS_ConvertUTF16toUTF8(textAcc->AsTextLeaf()->Text()).get(),
             NS_ConvertUTF16toUTF8(text).get());
#endif

    TextUpdater::Run(document, textAcc->AsTextLeaf(), text);
    return PL_DHASH_NEXT;
  }

  // Append an accessible if rendered text is not empty.
  if (!text.IsEmpty()) {
#ifdef DEBUG_NOTIFICATIONS
      PRUint32 index = containerNode->IndexOf(textNode);

      nsCAutoString tag;
      nsCAutoString id;
      if (containerElm) {
        containerElm->Tag()->ToUTF8String(tag);
        nsIAtom* atomid = containerElm->GetID();
        if (atomid)
          atomid->ToUTF8String(id);
      }

      printf("\npending text node insertion: container: %[email protected]='%s', index in container: %d\n\n",
             tag.get(), id.get(), index);
#endif

    // Make sure the text node is in accessible document still.
    Accessible* container = document->GetAccessibleOrContainer(containerNode);
    NS_ASSERTION(container,
                 "Text node having rendered text hasn't accessible document!");
    if (container) {
      nsTArray<nsCOMPtr<nsIContent> > insertedContents;
//.........这里部分代码省略.........