tor-browser

The Tor Browser
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SVGViewFrame.cpp (3797B)

      1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
      2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
      3 /* This Source Code Form is subject to the terms of the Mozilla Public
      4 * License, v. 2.0. If a copy of the MPL was not distributed with this
      5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
      6 
      7 // Keep in (case-insensitive) order:
      8 #include "mozilla/PresShell.h"
      9 #include "mozilla/SVGOuterSVGFrame.h"
     10 #include "mozilla/SVGUtils.h"
     11 #include "mozilla/dom/SVGSVGElement.h"
     12 #include "mozilla/dom/SVGViewElement.h"
     13 #include "nsGkAtoms.h"
     14 #include "nsIFrame.h"
     15 
     16 using namespace mozilla::dom;
     17 
     18 nsIFrame* NS_NewSVGViewFrame(mozilla::PresShell* aPresShell,
     19                             mozilla::ComputedStyle* aStyle);
     20 
     21 namespace mozilla {
     22 
     23 /**
     24 * While views are not directly rendered in SVG they can be linked to
     25 * and thereby override attributes of an <svg> element via a fragment
     26 * identifier. The SVGViewFrame class passes on any attribute changes
     27 * the view receives to the overridden <svg> element (if there is one).
     28 **/
     29 class SVGViewFrame final : public nsIFrame {
     30  friend nsIFrame* ::NS_NewSVGViewFrame(mozilla::PresShell* aPresShell,
     31                                        ComputedStyle* aStyle);
     32 
     33 protected:
     34  explicit SVGViewFrame(ComputedStyle* aStyle, nsPresContext* aPresContext)
     35      : nsIFrame(aStyle, aPresContext, kClassID) {
     36    AddStateBits(NS_FRAME_SVG_LAYOUT | NS_FRAME_IS_NONDISPLAY);
     37  }
     38 
     39 public:
     40  NS_DECL_FRAMEARENA_HELPERS(SVGViewFrame)
     41 
     42 #ifdef DEBUG
     43  void Init(nsIContent* aContent, nsContainerFrame* aParent,
     44            nsIFrame* aPrevInFlow) override;
     45 #endif
     46 
     47 #ifdef DEBUG_FRAME_DUMP
     48  nsresult GetFrameName(nsAString& aResult) const override {
     49    return MakeFrameName(u"SVGView"_ns, aResult);
     50  }
     51 #endif
     52 
     53  nsresult AttributeChanged(int32_t aNameSpaceID, nsAtom* aAttribute,
     54                            AttrModType aModType) override;
     55 
     56  bool ComputeCustomOverflow(OverflowAreas& aOverflowAreas) override {
     57    // We don't maintain a ink overflow rect
     58    return false;
     59  }
     60 };
     61 
     62 }  // namespace mozilla
     63 
     64 nsIFrame* NS_NewSVGViewFrame(mozilla::PresShell* aPresShell,
     65                             mozilla::ComputedStyle* aStyle) {
     66  return new (aPresShell)
     67      mozilla::SVGViewFrame(aStyle, aPresShell->GetPresContext());
     68 }
     69 
     70 namespace mozilla {
     71 
     72 NS_IMPL_FRAMEARENA_HELPERS(SVGViewFrame)
     73 
     74 #ifdef DEBUG
     75 void SVGViewFrame::Init(nsIContent* aContent, nsContainerFrame* aParent,
     76                        nsIFrame* aPrevInFlow) {
     77  NS_ASSERTION(aContent->IsSVGElement(nsGkAtoms::view),
     78               "Content is not an SVG view");
     79 
     80  nsIFrame::Init(aContent, aParent, aPrevInFlow);
     81 }
     82 #endif /* DEBUG */
     83 
     84 nsresult SVGViewFrame::AttributeChanged(int32_t aNameSpaceID,
     85                                        nsAtom* aAttribute,
     86                                        AttrModType aModType) {
     87  // Ignore zoomAndPan as it does not cause the <svg> element to re-render
     88 
     89  if (aNameSpaceID == kNameSpaceID_None &&
     90      (aAttribute == nsGkAtoms::preserveAspectRatio ||
     91       aAttribute == nsGkAtoms::viewBox)) {
     92    SVGOuterSVGFrame* outerSVGFrame = SVGUtils::GetOuterSVGFrame(this);
     93    NS_ASSERTION(outerSVGFrame->GetContent()->IsSVGElement(nsGkAtoms::svg),
     94                 "Expecting an <svg> element");
     95 
     96    SVGSVGElement* svgElement =
     97        static_cast<SVGSVGElement*>(outerSVGFrame->GetContent());
     98 
     99    nsAutoString viewID;
    100    mContent->AsElement()->GetAttr(nsGkAtoms::id, viewID);
    101 
    102    if (svgElement->IsOverriddenBy(viewID)) {
    103      // We're the view that's providing overrides, so pretend that the frame
    104      // we're overriding was updated.
    105      outerSVGFrame->AttributeChanged(aNameSpaceID, aAttribute, aModType);
    106    }
    107  }
    108 
    109  return nsIFrame::AttributeChanged(aNameSpaceID, aAttribute, aModType);
    110 }
    111 
    112 }  // namespace mozilla