C++ (Cpp) SVGSVGElement::IsOverriddenBy示例

nsresult
SVGViewFrame::AttributeChanged(int32_t  aNameSpaceID,
                               nsIAtom* aAttribute,
                               int32_t  aModType)
{
  // Ignore zoomAndPan as it does not cause the <svg> element to re-render
    
  if (aNameSpaceID == kNameSpaceID_None &&
      (aAttribute == nsGkAtoms::preserveAspectRatio ||
       aAttribute == nsGkAtoms::viewBox ||
       aAttribute == nsGkAtoms::viewTarget)) {

    nsSVGOuterSVGFrame *outerSVGFrame = nsSVGUtils::GetOuterSVGFrame(this);
    NS_ASSERTION(outerSVGFrame->GetContent()->IsSVG(nsGkAtoms::svg),
                 "Expecting an <svg> element");

    SVGSVGElement* svgElement =
      static_cast<SVGSVGElement*>(outerSVGFrame->GetContent());

    nsAutoString viewID;
    mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::id, viewID);

    if (svgElement->IsOverriddenBy(viewID)) {
      // We're the view that's providing overrides, so pretend that the frame
      // we're overriding was updated.
      outerSVGFrame->AttributeChanged(aNameSpaceID, aAttribute, aModType);
    }
  }

  return SVGViewFrameBase::AttributeChanged(aNameSpaceID,
                                            aAttribute, aModType);
}