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

void
NotificationController::WillRefresh(mozilla::TimeStamp aTime)
{
  // If the document accessible that notification collector was created for is
  // now shut down, don't process notifications anymore.
  NS_ASSERTION(mDocument,
               "The document was shut down while refresh observer is attached!");
  if (!mDocument)
    return;

  // Any generic notifications should be queued if we're processing content
  // insertions or generic notifications.
  mObservingState = eRefreshProcessingForUpdate;

  // Initial accessible tree construction.
  if (!mDocument->HasLoadState(DocAccessible::eTreeConstructed)) {
    // If document is not bound to parent at this point then the document is not
    // ready yet (process notifications later).
    if (!mDocument->IsBoundToParent()) {
      mObservingState = eRefreshObserving;
      return;
    }

#ifdef DEBUG_NOTIFICATIONS
    printf("\ninitial tree created, document: %p, document node: %p\n",
           mDocument.get(), mDocument->GetDocumentNode());
#endif

    mDocument->DoInitialUpdate();

    NS_ASSERTION(mContentInsertions.Length() == 0,
                 "Pending content insertions while initial accessible tree isn't created!");
  }

  // Process content inserted notifications to update the tree. Process other
  // notifications like DOM events and then flush event queue. If any new
  // notifications are queued during this processing then they will be processed
  // on next refresh. If notification processing queues up new events then they
  // are processed in this refresh. If events processing queues up new events
  // then new events are processed on next refresh.
  // Note: notification processing or event handling may shut down the owning
  // document accessible.

  // Process only currently queued content inserted notifications.
  nsTArray<nsRefPtr<ContentInsertion> > contentInsertions;
  contentInsertions.SwapElements(mContentInsertions);

  PRUint32 insertionCount = contentInsertions.Length();
  for (PRUint32 idx = 0; idx < insertionCount; idx++) {
    contentInsertions[idx]->Process();
    if (!mDocument)
      return;
  }

  // Process rendered text change notifications.
  mTextHash.EnumerateEntries(TextEnumerator, mDocument);
  mTextHash.Clear();

  // Bind hanging child documents.
  PRUint32 hangingDocCnt = mHangingChildDocuments.Length();
  for (PRUint32 idx = 0; idx < hangingDocCnt; idx++) {
    DocAccessible* childDoc = mHangingChildDocuments[idx];
    if (childDoc->IsDefunct())
      continue;

    nsIContent* ownerContent = mDocument->GetDocumentNode()->
      FindContentForSubDocument(childDoc->GetDocumentNode());
    if (ownerContent) {
      Accessible* outerDocAcc = mDocument->GetAccessible(ownerContent);
      if (outerDocAcc && outerDocAcc->AppendChild(childDoc)) {
        if (mDocument->AppendChildDocument(childDoc))
          continue;

        outerDocAcc->RemoveChild(childDoc);
      }

      // Failed to bind the child document, destroy it.
      childDoc->Shutdown();
    }
  }
  mHangingChildDocuments.Clear();

  // If the document is ready and all its subdocuments are completely loaded
  // then process the document load.
  if (mDocument->HasLoadState(DocAccessible::eReady) &&
      !mDocument->HasLoadState(DocAccessible::eCompletelyLoaded) &&
      hangingDocCnt == 0) {
    PRUint32 childDocCnt = mDocument->ChildDocumentCount(), childDocIdx = 0;
    for (; childDocIdx < childDocCnt; childDocIdx++) {
      DocAccessible* childDoc = mDocument->GetChildDocumentAt(childDocIdx);
      if (!childDoc->HasLoadState(DocAccessible::eCompletelyLoaded))
        break;
    }

    if (childDocIdx == childDocCnt) {
      mDocument->ProcessLoad();
      if (!mDocument)
        return;
    }
  }
//.........这里部分代码省略.........