C++ nsCOMPtr::GetPrimaryFrame方法代码示例

  void DocumentLoaded(nsIDocument* aBindingDoc)
  {
    // We only need the document here to cause frame construction, so
    // we need the current doc, not the owner doc.
    nsIDocument* doc = mBoundElement->GetUncomposedDoc();
    if (!doc)
      return;

    // Destroy the frames for mBoundElement.
    nsIContent* destroyedFramesFor = nullptr;
    nsIPresShell* shell = doc->GetShell();
    if (shell) {
      shell->DestroyFramesFor(mBoundElement, &destroyedFramesFor);
    }
    MOZ_ASSERT(!mBoundElement->GetPrimaryFrame());

    // Get the binding.
    bool ready = false;
    nsXBLService::GetInstance()->BindingReady(mBoundElement, mBindingURI, &ready);
    if (!ready)
      return;

    // If |mBoundElement| is (in addition to having binding |mBinding|)
    // also a descendant of another element with binding |mBinding|,
    // then we might have just constructed it due to the
    // notification of its parent.  (We can know about both if the
    // binding loads were triggered from the DOM rather than frame
    // construction.)  So we have to check both whether the element
    // has a primary frame and whether it's in the frame manager maps
    // before sending a ContentInserted notification, or bad things
    // will happen.
    MOZ_ASSERT(shell == doc->GetShell());
    if (shell) {
      nsIFrame* childFrame = mBoundElement->GetPrimaryFrame();
      if (!childFrame) {
        // Check to see if it's in the undisplayed content map...
        nsFrameManager* fm = shell->FrameManager();
        nsStyleContext* sc = fm->GetUndisplayedContent(mBoundElement);
        if (!sc) {
          // or in the display:contents map.
          sc = fm->GetDisplayContentsStyleFor(mBoundElement);
        }
        if (!sc) {
          shell->CreateFramesFor(destroyedFramesFor);
        }
      }
    }
  }

static bool
ShouldZoomToElement(const nsCOMPtr<dom::Element>& aElement) {
  if (nsIFrame* frame = aElement->GetPrimaryFrame()) {
    if (frame->GetDisplay() == NS_STYLE_DISPLAY_INLINE) {
      return false;
    }
  }
  if (aElement->IsAnyOfHTMLElements(nsGkAtoms::li, nsGkAtoms::q)) {
    return false;
  }
  return true;
}

static bool
ShouldZoomToElement(const nsCOMPtr<dom::Element>& aElement) {
  if (nsIFrame* frame = aElement->GetPrimaryFrame()) {
    if (frame->GetDisplay() == StyleDisplay::Inline) {
      return false;
    }
  }
  if (aElement->IsAnyOfHTMLElements(nsGkAtoms::li, nsGkAtoms::q)) {
    return false;
  }
  return true;
}

// Calculate the bounding rect of |aElement|, relative to the origin
// of the document associated with |aShell|.
// |aRootScrollFrame| should be the root scroll frame of the document in
// question.
// The implementation is adapted from Element::GetBoundingClientRect().
static CSSRect
GetBoundingContentRect(const nsCOMPtr<nsIPresShell>& aShell,
                       const nsCOMPtr<dom::Element>& aElement,
                       const nsIScrollableFrame* aRootScrollFrame) {
  if (nsIFrame* frame = aElement->GetPrimaryFrame()) {
    return CSSRect::FromAppUnits(
        nsLayoutUtils::GetAllInFlowRectsUnion(
            frame,
            aShell->GetRootFrame(),
            nsLayoutUtils::RECTS_ACCOUNT_FOR_TRANSFORMS)
      + aRootScrollFrame->GetScrollPosition());
  }
  return CSSRect();
}

  void DocumentLoaded(nsIDocument* aBindingDoc)
  {
    // We only need the document here to cause frame construction, so
    // we need the current doc, not the owner doc.
    nsIDocument* doc = mBoundElement->GetCurrentDoc();
    if (!doc)
      return;

    // Get the binding.
    bool ready = false;
    gXBLService->BindingReady(mBoundElement, mBindingURI, &ready);

    if (!ready)
      return;

    // If |mBoundElement| is (in addition to having binding |mBinding|)
    // also a descendant of another element with binding |mBinding|,
    // then we might have just constructed it due to the
    // notification of its parent.  (We can know about both if the
    // binding loads were triggered from the DOM rather than frame
    // construction.)  So we have to check both whether the element
    // has a primary frame and whether it's in the undisplayed map
    // before sending a ContentInserted notification, or bad things
    // will happen.
    nsIPresShell *shell = doc->GetShell();
    if (shell) {
      nsIFrame* childFrame = mBoundElement->GetPrimaryFrame();
      if (!childFrame) {
        // Check to see if it's in the undisplayed content map.
        nsStyleContext* sc =
          shell->FrameManager()->GetUndisplayedContent(mBoundElement);

        if (!sc) {
          shell->RecreateFramesFor(mBoundElement);
        }
      }
    }
  }