C++ nsCOMPtr::First方法代码示例

void
nsFindContentIterator::MaybeSetupInnerIterator()
{
  mInnerIterator = nsnull;

  nsCOMPtr<nsIContent> content =
    do_QueryInterface(mOuterIterator->GetCurrentNode());
  if (!content || !content->IsNodeOfType(nsINode::eHTML_FORM_CONTROL))
    return;

  nsCOMPtr<nsIFormControl> formControl(do_QueryInterface(content));
  if (!formControl->IsTextControl(true)) {
    return;
  }

  SetupInnerIterator(content);
  if (mInnerIterator) {
    if (!mFindBackward) {
      mInnerIterator->First();
      // finish setup: position mOuterIterator on the actual "next"
      // node (this completes its re-init, @see SetupInnerIterator)
      if (!mOuterIterator->IsDone())
        mOuterIterator->First();
    }
    else {
      mInnerIterator->Last();
      // finish setup: position mOuterIterator on the actual "previous"
      // node (this completes its re-init, @see SetupInnerIterator)
      if (!mOuterIterator->IsDone())
        mOuterIterator->Last();
    }
  }
}

void
nsFindContentIterator::MaybeSetupInnerIterator()
{
  mInnerIterator = nsnull;

  nsIContent* content = mOuterIterator->GetCurrentNode();
  if (!content || !content->IsNodeOfType(nsINode::eHTML_FORM_CONTROL))
    return;

  nsCOMPtr<nsIFormControl> formControl(do_QueryInterface(content));
  PRInt32 controlType = formControl->GetType();
  if (controlType != NS_FORM_TEXTAREA && 
      controlType != NS_FORM_INPUT_TEXT)
    return;

  SetupInnerIterator(content);
  if (mInnerIterator) {
    if (!mFindBackward) {
      mInnerIterator->First();
      // finish setup: position mOuterIterator on the actual "next"
      // node (this completes its re-init, @see SetupInnerIterator)
      mOuterIterator->First();
    }
    else {
      mInnerIterator->Last();
      // finish setup: position mOuterIterator on the actual "previous"
      // node (this completes its re-init, @see SetupInnerIterator)
      mOuterIterator->Last();
    }
  }
}

void
nsFindContentIterator::Reset()
{
  mInnerIterator = nsnull;
  mStartOuterContent = nsnull;
  mEndOuterContent = nsnull;

  // As a consequence of searching through text controls, we may have been
  // initialized with a selection inside a <textarea> or a text <input>.

  // see if the start node is an anonymous text node inside a text control
  nsCOMPtr<nsIContent> startContent(do_QueryInterface(mStartNode));
  if (startContent) {
    mStartOuterContent = startContent->FindFirstNonNativeAnonymous();
  }

  // see if the end node is an anonymous text node inside a text control
  nsCOMPtr<nsIContent> endContent(do_QueryInterface(mEndNode));
  if (endContent) {
    mEndOuterContent = endContent->FindFirstNonNativeAnonymous();
  }

  // Note: OK to just set up the outer iterator here; if our range has a native
  // anonymous endpoint we'll end up setting up an inner iterator, and
  // reset the outer one in the process.
  nsCOMPtr<nsIDOMRange> range = nsFind::CreateRange();
  range->SetStart(mStartNode, mStartOffset);
  range->SetEnd(mEndNode, mEndOffset);
  mOuterIterator->Init(range);

  if (!mFindBackward) {
    if (mStartOuterContent != startContent) {
      // the start node was an anonymous text node
      SetupInnerIterator(mStartOuterContent);
      if (mInnerIterator)
        mInnerIterator->First();
    }
    if (!mOuterIterator->IsDone())
      mOuterIterator->First();
  }
  else {
    if (mEndOuterContent != endContent) {
      // the end node was an anonymous text node
      SetupInnerIterator(mEndOuterContent);
      if (mInnerIterator)
        mInnerIterator->Last();
    }
    if (!mOuterIterator->IsDone())
      mOuterIterator->Last();
  }

  // if we didn't create an inner-iterator, the boundary node could still be
  // a text control, in which case we also need an inner-iterator straightaway
  if (!mInnerIterator) {
    MaybeSetupInnerIterator();
  }
}